MFC: r272492

  Merge pc98's machdep.c into i386/i386/machdep.c.

1 files changed, 0 insertions, 2999 deletions

diff --git a/sys/pc98/pc98/machdep.c b/sys/pc98/pc98/machdep.c
deleted file mode 100644
index e046960..0000000
--- a/sys/pc98/pc98/machdep.c
+++ /dev/null
@@ -1,2999 +0,0 @@
-/*-
- * Copyright (c) 1992 Terrence R. Lambert.
- * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * William Jolitz.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by the University of
- *	California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	from: @(#)machdep.c	7.4 (Berkeley) 6/3/91
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include "opt_apic.h"
-#include "opt_atalk.h"
-#include "opt_atpic.h"
-#include "opt_compat.h"
-#include "opt_cpu.h"
-#include "opt_ddb.h"
-#include "opt_inet.h"
-#include "opt_ipx.h"
-#include "opt_isa.h"
-#include "opt_kstack_pages.h"
-#include "opt_maxmem.h"
-#include "opt_mp_watchdog.h"
-#include "opt_npx.h"
-#include "opt_perfmon.h"
-#include "opt_kdtrace.h"
-
-#include <sys/param.h>
-#include <sys/proc.h>
-#include <sys/systm.h>
-#include <sys/bio.h>
-#include <sys/buf.h>
-#include <sys/bus.h>
-#include <sys/callout.h>
-#include <sys/cons.h>
-#include <sys/cpu.h>
-#include <sys/eventhandler.h>
-#include <sys/exec.h>
-#include <sys/imgact.h>
-#include <sys/kdb.h>
-#include <sys/kernel.h>
-#include <sys/ktr.h>
-#include <sys/linker.h>
-#include <sys/lock.h>
-#include <sys/malloc.h>
-#include <sys/memrange.h>
-#include <sys/msgbuf.h>
-#include <sys/mutex.h>
-#include <sys/pcpu.h>
-#include <sys/ptrace.h>
-#include <sys/reboot.h>
-#include <sys/rwlock.h>
-#include <sys/sched.h>
-#include <sys/signalvar.h>
-#ifdef SMP
-#include <sys/smp.h>
-#endif
-#include <sys/syscallsubr.h>
-#include <sys/sysctl.h>
-#include <sys/sysent.h>
-#include <sys/sysproto.h>
-#include <sys/ucontext.h>
-#include <sys/vmmeter.h>
-
-#include <vm/vm.h>
-#include <vm/vm_extern.h>
-#include <vm/vm_kern.h>
-#include <vm/vm_page.h>
-#include <vm/vm_map.h>
-#include <vm/vm_object.h>
-#include <vm/vm_pager.h>
-#include <vm/vm_param.h>
-
-#ifdef DDB
-#ifndef KDB
-#error KDB must be enabled in order for DDB to work!
-#endif
-#include <ddb/ddb.h>
-#include <ddb/db_sym.h>
-#endif
-
-#include <pc98/pc98/pc98_machdep.h>
-
-#include <net/netisr.h>
-
-#include <machine/bootinfo.h>
-#include <machine/clock.h>
-#include <machine/cpu.h>
-#include <machine/cputypes.h>
-#include <machine/intr_machdep.h>
-#include <x86/mca.h>
-#include <machine/md_var.h>
-#include <machine/mp_watchdog.h>
-#include <machine/pc/bios.h>
-#include <machine/pcb.h>
-#include <machine/pcb_ext.h>
-#include <machine/proc.h>
-#include <machine/reg.h>
-#include <machine/sigframe.h>
-#include <machine/specialreg.h>
-#include <machine/vm86.h>
-#ifdef PERFMON
-#include <machine/perfmon.h>
-#endif
-#ifdef SMP
-#include <machine/smp.h>
-#endif
-
-#ifdef DEV_APIC
-#include <machine/apicvar.h>
-#endif
-
-#ifdef DEV_ISA
-#include <x86/isa/icu.h>
-#endif
-
-/* Sanity check for __curthread() */
-CTASSERT(offsetof(struct pcpu, pc_curthread) == 0);
-
-extern void init386(int first);
-extern void dblfault_handler(void);
-
-#define	CS_SECURE(cs)		(ISPL(cs) == SEL_UPL)
-#define	EFL_SECURE(ef, oef)	((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
-
-#if !defined(CPU_DISABLE_SSE) && defined(I686_CPU)
-#define CPU_ENABLE_SSE
-#endif
-
-static void cpu_startup(void *);
-static void fpstate_drop(struct thread *td);
-static void get_fpcontext(struct thread *td, mcontext_t *mcp);
-static int  set_fpcontext(struct thread *td, const mcontext_t *mcp);
-#ifdef CPU_ENABLE_SSE
-static void set_fpregs_xmm(struct save87 *, struct savexmm *);
-static void fill_fpregs_xmm(struct savexmm *, struct save87 *);
-#endif /* CPU_ENABLE_SSE */
-SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
-
-int	need_pre_dma_flush;	/* If 1, use wbinvd befor DMA transfer. */
-int	need_post_dma_flush;	/* If 1, use invd after DMA transfer. */
-
-#ifdef DDB
-extern vm_offset_t ksym_start, ksym_end;
-#endif
-
-int	_udatasel, _ucodesel;
-u_int	basemem;
-
-static int	ispc98 = 1;
-SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, "");
-
-int cold = 1;
-
-#ifdef COMPAT_43
-static void osendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
-#endif
-#ifdef COMPAT_FREEBSD4
-static void freebsd4_sendsig(sig_t catcher, ksiginfo_t *, sigset_t *mask);
-#endif
-
-long Maxmem = 0;
-long realmem = 0;
-
-/*
- * The number of PHYSMAP entries must be one less than the number of
- * PHYSSEG entries because the PHYSMAP entry that spans the largest
- * physical address that is accessible by ISA DMA is split into two
- * PHYSSEG entries.
- */
-#define	PHYSMAP_SIZE	(2 * (VM_PHYSSEG_MAX - 1))
-
-vm_paddr_t phys_avail[PHYSMAP_SIZE + 2];
-vm_paddr_t dump_avail[PHYSMAP_SIZE + 2];
-
-/* must be 2 less so 0 0 can signal end of chunks */
-#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2)
-#define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2)
-
-struct kva_md_info kmi;
-
-static struct trapframe proc0_tf;
-struct pcpu __pcpu[MAXCPU];
-
-struct mtx icu_lock;
-
-struct mem_range_softc mem_range_softc;
-
-static void
-cpu_startup(dummy)
-	void *dummy;
-{
-	uintmax_t memsize;
-
-	/*
-	 * Good {morning,afternoon,evening,night}.
-	 */
-	startrtclock();
-	printcpuinfo();
-	panicifcpuunsupported();
-#ifdef PERFMON
-	perfmon_init();
-#endif
-	realmem = Maxmem;
-
-	/*
-	 * Display physical memory.
-	 */
-	memsize = ptoa((uintmax_t)Maxmem);
-	printf("real memory  = %ju (%ju MB)\n", memsize, memsize >> 20);
-
-	/*
-	 * Display any holes after the first chunk of extended memory.
-	 */
-	if (bootverbose) {
-		int indx;
-
-		printf("Physical memory chunk(s):\n");
-		for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
-			vm_paddr_t size;
-
-			size = phys_avail[indx + 1] - phys_avail[indx];
-			printf(
-			    "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
-			    (uintmax_t)phys_avail[indx],
-			    (uintmax_t)phys_avail[indx + 1] - 1,
-			    (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
-		}
-	}
-
-	vm_ksubmap_init(&kmi);
-
-	printf("avail memory = %ju (%ju MB)\n",
-	    ptoa((uintmax_t)cnt.v_free_count),
-	    ptoa((uintmax_t)cnt.v_free_count) / 1048576);
-
-	/*
-	 * Set up buffers, so they can be used to read disk labels.
-	 */
-	bufinit();
-	vm_pager_bufferinit();
-	cpu_setregs();
-}
-
-/*
- * Send an interrupt to process.
- *
- * Stack is set up to allow sigcode stored
- * at top to call routine, followed by kcall
- * to sigreturn routine below.  After sigreturn
- * resets the signal mask, the stack, and the
- * frame pointer, it returns to the user
- * specified pc, psl.
- */
-#ifdef COMPAT_43
-static void
-osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
-{
-	struct osigframe sf, *fp;
-	struct proc *p;
-	struct thread *td;
-	struct sigacts *psp;
-	struct trapframe *regs;
-	int sig;
-	int oonstack;
-
-	td = curthread;
-	p = td->td_proc;
-	PROC_LOCK_ASSERT(p, MA_OWNED);
-	sig = ksi->ksi_signo;
-	psp = p->p_sigacts;
-	mtx_assert(&psp->ps_mtx, MA_OWNED);
-	regs = td->td_frame;
-	oonstack = sigonstack(regs->tf_esp);
-
-	/* Allocate space for the signal handler context. */
-	if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
-	    SIGISMEMBER(psp->ps_sigonstack, sig)) {
-		fp = (struct osigframe *)(td->td_sigstk.ss_sp +
-		    td->td_sigstk.ss_size - sizeof(struct osigframe));
-#if defined(COMPAT_43)
-		td->td_sigstk.ss_flags |= SS_ONSTACK;
-#endif
-	} else
-		fp = (struct osigframe *)regs->tf_esp - 1;
-
-	/* Translate the signal if appropriate. */
-	if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
-		sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
-
-	/* Build the argument list for the signal handler. */
-	sf.sf_signum = sig;
-	sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
-	bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo));
-	if (SIGISMEMBER(psp->ps_siginfo, sig)) {
-		/* Signal handler installed with SA_SIGINFO. */
-		sf.sf_arg2 = (register_t)&fp->sf_siginfo;
-		sf.sf_siginfo.si_signo = sig;
-		sf.sf_siginfo.si_code = ksi->ksi_code;
-		sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher;
-		sf.sf_addr = 0;
-	} else {
-		/* Old FreeBSD-style arguments. */
-		sf.sf_arg2 = ksi->ksi_code;
-		sf.sf_addr = (register_t)ksi->ksi_addr;
-		sf.sf_ahu.sf_handler = catcher;
-	}
-	mtx_unlock(&psp->ps_mtx);
-	PROC_UNLOCK(p);
-
-	/* Save most if not all of trap frame. */
-	sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax;
-	sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx;
-	sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx;
-	sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx;
-	sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi;
-	sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi;
-	sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
-	sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
-	sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
-	sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
-	sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
-	sf.sf_siginfo.si_sc.sc_gs = rgs();
-	sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp;
-
-	/* Build the signal context to be used by osigreturn(). */
-	sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
-	SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
-	sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp;
-	sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp;
-	sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip;
-	sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags;
-	sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
-	sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
-
-	/*
-	 * If we're a vm86 process, we want to save the segment registers.
-	 * We also change eflags to be our emulated eflags, not the actual
-	 * eflags.
-	 */
-	if (regs->tf_eflags & PSL_VM) {
-		/* XXX confusing names: `tf' isn't a trapframe; `regs' is. */
-		struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
-		struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
-
-		sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs;
-		sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs;
-		sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es;
-		sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds;
-
-		if (vm86->vm86_has_vme == 0)
-			sf.sf_siginfo.si_sc.sc_ps =
-			    (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
-			    (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
-
-		/* See sendsig() for comments. */
-		tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
-	}
-
-	/*
-	 * Copy the sigframe out to the user's stack.
-	 */
-	if (copyout(&sf, fp, sizeof(*fp)) != 0) {
-#ifdef DEBUG
-		printf("process %ld has trashed its stack\n", (long)p->p_pid);
-#endif
-		PROC_LOCK(p);
-		sigexit(td, SIGILL);
-	}
-
-	regs->tf_esp = (int)fp;
-	if (p->p_sysent->sv_sigcode_base != 0) {
-		regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
-		    szosigcode;
-	} else {
-		/* a.out sysentvec does not use shared page */
-		regs->tf_eip = p->p_sysent->sv_psstrings - szosigcode;
-	}
-	regs->tf_eflags &= ~(PSL_T | PSL_D);
-	regs->tf_cs = _ucodesel;
-	regs->tf_ds = _udatasel;
-	regs->tf_es = _udatasel;
-	regs->tf_fs = _udatasel;
-	load_gs(_udatasel);
-	regs->tf_ss = _udatasel;
-	PROC_LOCK(p);
-	mtx_lock(&psp->ps_mtx);
-}
-#endif /* COMPAT_43 */
-
-#ifdef COMPAT_FREEBSD4
-static void
-freebsd4_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
-{
-	struct sigframe4 sf, *sfp;
-	struct proc *p;
-	struct thread *td;
-	struct sigacts *psp;
-	struct trapframe *regs;
-	int sig;
-	int oonstack;
-
-	td = curthread;
-	p = td->td_proc;
-	PROC_LOCK_ASSERT(p, MA_OWNED);
-	sig = ksi->ksi_signo;
-	psp = p->p_sigacts;
-	mtx_assert(&psp->ps_mtx, MA_OWNED);
-	regs = td->td_frame;
-	oonstack = sigonstack(regs->tf_esp);
-
-	/* Save user context. */
-	bzero(&sf, sizeof(sf));
-	sf.sf_uc.uc_sigmask = *mask;
-	sf.sf_uc.uc_stack = td->td_sigstk;
-	sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
-	    ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
-	sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
-	sf.sf_uc.uc_mcontext.mc_gs = rgs();
-	bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
-	bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
-	    sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
-	bzero(sf.sf_uc.uc_mcontext.__spare__,
-	    sizeof(sf.sf_uc.uc_mcontext.__spare__));
-	bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
-
-	/* Allocate space for the signal handler context. */
-	if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
-	    SIGISMEMBER(psp->ps_sigonstack, sig)) {
-		sfp = (struct sigframe4 *)(td->td_sigstk.ss_sp +
-		    td->td_sigstk.ss_size - sizeof(struct sigframe4));
-#if defined(COMPAT_43)
-		td->td_sigstk.ss_flags |= SS_ONSTACK;
-#endif
-	} else
-		sfp = (struct sigframe4 *)regs->tf_esp - 1;
-
-	/* Translate the signal if appropriate. */
-	if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
-		sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
-
-	/* Build the argument list for the signal handler. */
-	sf.sf_signum = sig;
-	sf.sf_ucontext = (register_t)&sfp->sf_uc;
-	bzero(&sf.sf_si, sizeof(sf.sf_si));
-	if (SIGISMEMBER(psp->ps_siginfo, sig)) {
-		/* Signal handler installed with SA_SIGINFO. */
-		sf.sf_siginfo = (register_t)&sfp->sf_si;
-		sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
-
-		/* Fill in POSIX parts */
-		sf.sf_si.si_signo = sig;
-		sf.sf_si.si_code = ksi->ksi_code;
-		sf.sf_si.si_addr = ksi->ksi_addr;
-	} else {
-		/* Old FreeBSD-style arguments. */
-		sf.sf_siginfo = ksi->ksi_code;
-		sf.sf_addr = (register_t)ksi->ksi_addr;
-		sf.sf_ahu.sf_handler = catcher;
-	}
-	mtx_unlock(&psp->ps_mtx);
-	PROC_UNLOCK(p);
-
-	/*
-	 * If we're a vm86 process, we want to save the segment registers.
-	 * We also change eflags to be our emulated eflags, not the actual
-	 * eflags.
-	 */
-	if (regs->tf_eflags & PSL_VM) {
-		struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
-		struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
-
-		sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
-		sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
-		sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
-		sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
-
-		if (vm86->vm86_has_vme == 0)
-			sf.sf_uc.uc_mcontext.mc_eflags =
-			    (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
-			    (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
-
-		/*
-		 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
-		 * syscalls made by the signal handler.  This just avoids
-		 * wasting time for our lazy fixup of such faults.  PSL_NT
-		 * does nothing in vm86 mode, but vm86 programs can set it
-		 * almost legitimately in probes for old cpu types.
-		 */
-		tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
-	}
-
-	/*
-	 * Copy the sigframe out to the user's stack.
-	 */
-	if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
-#ifdef DEBUG
-		printf("process %ld has trashed its stack\n", (long)p->p_pid);
-#endif
-		PROC_LOCK(p);
-		sigexit(td, SIGILL);
-	}
-
-	regs->tf_esp = (int)sfp;
-	regs->tf_eip = p->p_sysent->sv_sigcode_base + szsigcode -
-	    szfreebsd4_sigcode;
-	regs->tf_eflags &= ~(PSL_T | PSL_D);
-	regs->tf_cs = _ucodesel;
-	regs->tf_ds = _udatasel;
-	regs->tf_es = _udatasel;
-	regs->tf_fs = _udatasel;
-	regs->tf_ss = _udatasel;
-	PROC_LOCK(p);
-	mtx_lock(&psp->ps_mtx);
-}
-#endif	/* COMPAT_FREEBSD4 */
-
-void
-sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
-{
-	struct sigframe sf, *sfp;
-	struct proc *p;
-	struct thread *td;
-	struct sigacts *psp;
-	char *sp;
-	struct trapframe *regs;
-	struct segment_descriptor *sdp;
-	int sig;
-	int oonstack;
-
-	td = curthread;
-	p = td->td_proc;
-	PROC_LOCK_ASSERT(p, MA_OWNED);
-	sig = ksi->ksi_signo;
-	psp = p->p_sigacts;
-	mtx_assert(&psp->ps_mtx, MA_OWNED);
-#ifdef COMPAT_FREEBSD4
-	if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
-		freebsd4_sendsig(catcher, ksi, mask);
-		return;
-	}
-#endif
-#ifdef COMPAT_43
-	if (SIGISMEMBER(psp->ps_osigset, sig)) {
-		osendsig(catcher, ksi, mask);
-		return;
-	}
-#endif
-	regs = td->td_frame;
-	oonstack = sigonstack(regs->tf_esp);
-
-	/* Save user context. */
-	bzero(&sf, sizeof(sf));
-	sf.sf_uc.uc_sigmask = *mask;
-	sf.sf_uc.uc_stack = td->td_sigstk;
-	sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
-	    ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
-	sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
-	sf.sf_uc.uc_mcontext.mc_gs = rgs();
-	bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs));
-	sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
-	get_fpcontext(td, &sf.sf_uc.uc_mcontext);
-	fpstate_drop(td);
-	/*
-	 * Unconditionally fill the fsbase and gsbase into the mcontext.
-	 */
-	sdp = &td->td_pcb->pcb_fsd;
-	sf.sf_uc.uc_mcontext.mc_fsbase = sdp->sd_hibase << 24 |
-	    sdp->sd_lobase;
-	sdp = &td->td_pcb->pcb_gsd;
-	sf.sf_uc.uc_mcontext.mc_gsbase = sdp->sd_hibase << 24 |
-	    sdp->sd_lobase;
-	sf.sf_uc.uc_mcontext.mc_flags = 0;
-	bzero(sf.sf_uc.uc_mcontext.mc_spare2,
-	    sizeof(sf.sf_uc.uc_mcontext.mc_spare2));
-	bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
-
-	/* Allocate space for the signal handler context. */
-	if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
-	    SIGISMEMBER(psp->ps_sigonstack, sig)) {
-		sp = td->td_sigstk.ss_sp +
-		    td->td_sigstk.ss_size - sizeof(struct sigframe);
-#if defined(COMPAT_43)
-		td->td_sigstk.ss_flags |= SS_ONSTACK;
-#endif
-	} else
-		sp = (char *)regs->tf_esp - sizeof(struct sigframe);
-	/* Align to 16 bytes. */
-	sfp = (struct sigframe *)((unsigned int)sp & ~0xF);
-
-	/* Translate the signal if appropriate. */
-	if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
-		sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
-
-	/* Build the argument list for the signal handler. */
-	sf.sf_signum = sig;
-	sf.sf_ucontext = (register_t)&sfp->sf_uc;
-	bzero(&sf.sf_si, sizeof(sf.sf_si));
-	if (SIGISMEMBER(psp->ps_siginfo, sig)) {
-		/* Signal handler installed with SA_SIGINFO. */
-		sf.sf_siginfo = (register_t)&sfp->sf_si;
-		sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
-
-		/* Fill in POSIX parts */
-		sf.sf_si = ksi->ksi_info;
-		sf.sf_si.si_signo = sig; /* maybe a translated signal */
-	} else {
-		/* Old FreeBSD-style arguments. */
-		sf.sf_siginfo = ksi->ksi_code;
-		sf.sf_addr = (register_t)ksi->ksi_addr;
-		sf.sf_ahu.sf_handler = catcher;
-	}
-	mtx_unlock(&psp->ps_mtx);
-	PROC_UNLOCK(p);
-
-	/*
-	 * If we're a vm86 process, we want to save the segment registers.
-	 * We also change eflags to be our emulated eflags, not the actual
-	 * eflags.
-	 */
-	if (regs->tf_eflags & PSL_VM) {
-		struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
-		struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86;
-
-		sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
-		sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
-		sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
-		sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
-
-		if (vm86->vm86_has_vme == 0)
-			sf.sf_uc.uc_mcontext.mc_eflags =
-			    (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
-			    (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
-
-		/*
-		 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
-		 * syscalls made by the signal handler.  This just avoids
-		 * wasting time for our lazy fixup of such faults.  PSL_NT
-		 * does nothing in vm86 mode, but vm86 programs can set it
-		 * almost legitimately in probes for old cpu types.
-		 */
-		tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
-	}
-
-	/*
-	 * Copy the sigframe out to the user's stack.
-	 */
-	if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
-#ifdef DEBUG
-		printf("process %ld has trashed its stack\n", (long)p->p_pid);
-#endif
-		PROC_LOCK(p);
-		sigexit(td, SIGILL);
-	}
-
-	regs->tf_esp = (int)sfp;
-	regs->tf_eip = p->p_sysent->sv_sigcode_base;
-	regs->tf_eflags &= ~(PSL_T | PSL_D);
-	regs->tf_cs = _ucodesel;
-	regs->tf_ds = _udatasel;
-	regs->tf_es = _udatasel;
-	regs->tf_fs = _udatasel;
-	regs->tf_ss = _udatasel;
-	PROC_LOCK(p);
-	mtx_lock(&psp->ps_mtx);
-}
-
-/*
- * System call to cleanup state after a signal
- * has been taken.  Reset signal mask and
- * stack state from context left by sendsig (above).
- * Return to previous pc and psl as specified by
- * context left by sendsig. Check carefully to
- * make sure that the user has not modified the
- * state to gain improper privileges.
- *
- * MPSAFE
- */
-#ifdef COMPAT_43
-int
-osigreturn(td, uap)
-	struct thread *td;
-	struct osigreturn_args /* {
-		struct osigcontext *sigcntxp;
-	} */ *uap;
-{
-	struct osigcontext sc;
-	struct trapframe *regs;
-	struct osigcontext *scp;
-	int eflags, error;
-	ksiginfo_t ksi;
-
-	regs = td->td_frame;
-	error = copyin(uap->sigcntxp, &sc, sizeof(sc));
-	if (error != 0)
-		return (error);
-	scp = &sc;
-	eflags = scp->sc_ps;
-	if (eflags & PSL_VM) {
-		struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
-		struct vm86_kernel *vm86;
-
-		/*
-		 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
-		 * set up the vm86 area, and we can't enter vm86 mode.
-		 */
-		if (td->td_pcb->pcb_ext == 0)
-			return (EINVAL);
-		vm86 = &td->td_pcb->pcb_ext->ext_vm86;
-		if (vm86->vm86_inited == 0)
-			return (EINVAL);
-
-		/* Go back to user mode if both flags are set. */
-		if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
-			ksiginfo_init_trap(&ksi);
-			ksi.ksi_signo = SIGBUS;
-			ksi.ksi_code = BUS_OBJERR;
-			ksi.ksi_addr = (void *)regs->tf_eip;
-			trapsignal(td, &ksi);
-		}
-
-		if (vm86->vm86_has_vme) {
-			eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
-			    (eflags & VME_USERCHANGE) | PSL_VM;
-		} else {
-			vm86->vm86_eflags = eflags;	/* save VIF, VIP */
-			eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
-			    (eflags & VM_USERCHANGE) | PSL_VM;
-		}
-		tf->tf_vm86_ds = scp->sc_ds;
-		tf->tf_vm86_es = scp->sc_es;
-		tf->tf_vm86_fs = scp->sc_fs;
-		tf->tf_vm86_gs = scp->sc_gs;
-		tf->tf_ds = _udatasel;
-		tf->tf_es = _udatasel;
-		tf->tf_fs = _udatasel;
-	} else {
-		/*
-		 * Don't allow users to change privileged or reserved flags.
-		 */
-		if (!EFL_SECURE(eflags, regs->tf_eflags)) {
-	    		return (EINVAL);
-		}
-
-		/*
-		 * Don't allow users to load a valid privileged %cs.  Let the
-		 * hardware check for invalid selectors, excess privilege in
-		 * other selectors, invalid %eip's and invalid %esp's.
-		 */
-		if (!CS_SECURE(scp->sc_cs)) {
-			ksiginfo_init_trap(&ksi);
-			ksi.ksi_signo = SIGBUS;
-			ksi.ksi_code = BUS_OBJERR;
-			ksi.ksi_trapno = T_PROTFLT;
-			ksi.ksi_addr = (void *)regs->tf_eip;
-			trapsignal(td, &ksi);
-			return (EINVAL);
-		}
-		regs->tf_ds = scp->sc_ds;
-		regs->tf_es = scp->sc_es;
-		regs->tf_fs = scp->sc_fs;
-	}
-
-	/* Restore remaining registers. */
-	regs->tf_eax = scp->sc_eax;
-	regs->tf_ebx = scp->sc_ebx;
-	regs->tf_ecx = scp->sc_ecx;
-	regs->tf_edx = scp->sc_edx;
-	regs->tf_esi = scp->sc_esi;
-	regs->tf_edi = scp->sc_edi;
-	regs->tf_cs = scp->sc_cs;
-	regs->tf_ss = scp->sc_ss;
-	regs->tf_isp = scp->sc_isp;
-	regs->tf_ebp = scp->sc_fp;
-	regs->tf_esp = scp->sc_sp;
-	regs->tf_eip = scp->sc_pc;
-	regs->tf_eflags = eflags;
-
-#if defined(COMPAT_43)
-	if (scp->sc_onstack & 1)
-		td->td_sigstk.ss_flags |= SS_ONSTACK;
-	else
-		td->td_sigstk.ss_flags &= ~SS_ONSTACK;
-#endif
-	kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
-	    SIGPROCMASK_OLD);
-	return (EJUSTRETURN);
-}
-#endif /* COMPAT_43 */
-
-#ifdef COMPAT_FREEBSD4
-/*
- * MPSAFE
- */
-int
-freebsd4_sigreturn(td, uap)
-	struct thread *td;
-	struct freebsd4_sigreturn_args /* {
-		const ucontext4 *sigcntxp;
-	} */ *uap;
-{
-	struct ucontext4 uc;
-	struct trapframe *regs;
-	struct ucontext4 *ucp;
-	int cs, eflags, error;
-	ksiginfo_t ksi;
-
-	error = copyin(uap->sigcntxp, &uc, sizeof(uc));
-	if (error != 0)
-		return (error);
-	ucp = &uc;
-	regs = td->td_frame;
-	eflags = ucp->uc_mcontext.mc_eflags;
-	if (eflags & PSL_VM) {
-		struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
-		struct vm86_kernel *vm86;
-
-		/*
-		 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
-		 * set up the vm86 area, and we can't enter vm86 mode.
-		 */
-		if (td->td_pcb->pcb_ext == 0)
-			return (EINVAL);
-		vm86 = &td->td_pcb->pcb_ext->ext_vm86;
-		if (vm86->vm86_inited == 0)
-			return (EINVAL);
-
-		/* Go back to user mode if both flags are set. */
-		if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
-			ksiginfo_init_trap(&ksi);
-			ksi.ksi_signo = SIGBUS;
-			ksi.ksi_code = BUS_OBJERR;
-			ksi.ksi_addr = (void *)regs->tf_eip;
-			trapsignal(td, &ksi);
-		}
-		if (vm86->vm86_has_vme) {
-			eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
-			    (eflags & VME_USERCHANGE) | PSL_VM;
-		} else {
-			vm86->vm86_eflags = eflags;	/* save VIF, VIP */
-			eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
-			    (eflags & VM_USERCHANGE) | PSL_VM;
-		}
-		bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
-		tf->tf_eflags = eflags;
-		tf->tf_vm86_ds = tf->tf_ds;
-		tf->tf_vm86_es = tf->tf_es;
-		tf->tf_vm86_fs = tf->tf_fs;
-		tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
-		tf->tf_ds = _udatasel;
-		tf->tf_es = _udatasel;
-		tf->tf_fs = _udatasel;
-	} else {
-		/*
-		 * Don't allow users to change privileged or reserved flags.
-		 */
-		if (!EFL_SECURE(eflags, regs->tf_eflags)) {
-			uprintf("pid %d (%s): freebsd4_sigreturn eflags = 0x%x\n",
-			    td->td_proc->p_pid, td->td_name, eflags);
-	    		return (EINVAL);
-		}
-
-		/*
-		 * Don't allow users to load a valid privileged %cs.  Let the
-		 * hardware check for invalid selectors, excess privilege in
-		 * other selectors, invalid %eip's and invalid %esp's.
-		 */
-		cs = ucp->uc_mcontext.mc_cs;
-		if (!CS_SECURE(cs)) {
-			uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
-			    td->td_proc->p_pid, td->td_name, cs);
-			ksiginfo_init_trap(&ksi);
-			ksi.ksi_signo = SIGBUS;
-			ksi.ksi_code = BUS_OBJERR;
-			ksi.ksi_trapno = T_PROTFLT;
-			ksi.ksi_addr = (void *)regs->tf_eip;
-			trapsignal(td, &ksi);
-			return (EINVAL);
-		}
-
-		bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
-	}
-
-#if defined(COMPAT_43)
-	if (ucp->uc_mcontext.mc_onstack & 1)
-		td->td_sigstk.ss_flags |= SS_ONSTACK;
-	else
-		td->td_sigstk.ss_flags &= ~SS_ONSTACK;
-#endif
-	kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
-	return (EJUSTRETURN);
-}
-#endif	/* COMPAT_FREEBSD4 */
-
-/*
- * MPSAFE
- */
-int
-sys_sigreturn(td, uap)
-	struct thread *td;
-	struct sigreturn_args /* {
-		const struct __ucontext *sigcntxp;
-	} */ *uap;
-{
-	ucontext_t uc;
-	struct trapframe *regs;
-	ucontext_t *ucp;
-	int cs, eflags, error, ret;
-	ksiginfo_t ksi;
-
-	error = copyin(uap->sigcntxp, &uc, sizeof(uc));
-	if (error != 0)
-		return (error);
-	ucp = &uc;
-	regs = td->td_frame;
-	eflags = ucp->uc_mcontext.mc_eflags;
-	if (eflags & PSL_VM) {
-		struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
-		struct vm86_kernel *vm86;
-
-		/*
-		 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
-		 * set up the vm86 area, and we can't enter vm86 mode.
-		 */
-		if (td->td_pcb->pcb_ext == 0)
-			return (EINVAL);
-		vm86 = &td->td_pcb->pcb_ext->ext_vm86;
-		if (vm86->vm86_inited == 0)
-			return (EINVAL);
-
-		/* Go back to user mode if both flags are set. */
-		if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) {
-			ksiginfo_init_trap(&ksi);
-			ksi.ksi_signo = SIGBUS;
-			ksi.ksi_code = BUS_OBJERR;
-			ksi.ksi_addr = (void *)regs->tf_eip;
-			trapsignal(td, &ksi);
-		}
-
-		if (vm86->vm86_has_vme) {
-			eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
-			    (eflags & VME_USERCHANGE) | PSL_VM;
-		} else {
-			vm86->vm86_eflags = eflags;	/* save VIF, VIP */
-			eflags = (tf->tf_eflags & ~VM_USERCHANGE) |
-			    (eflags & VM_USERCHANGE) | PSL_VM;
-		}
-		bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe));
-		tf->tf_eflags = eflags;
-		tf->tf_vm86_ds = tf->tf_ds;
-		tf->tf_vm86_es = tf->tf_es;
-		tf->tf_vm86_fs = tf->tf_fs;
-		tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs;
-		tf->tf_ds = _udatasel;
-		tf->tf_es = _udatasel;
-		tf->tf_fs = _udatasel;
-	} else {
-		/*
-		 * Don't allow users to change privileged or reserved flags.
-		 */
-		if (!EFL_SECURE(eflags, regs->tf_eflags)) {
-			uprintf("pid %d (%s): sigreturn eflags = 0x%x\n",
-			    td->td_proc->p_pid, td->td_name, eflags);
-	    		return (EINVAL);
-		}
-
-		/*
-		 * Don't allow users to load a valid privileged %cs.  Let the
-		 * hardware check for invalid selectors, excess privilege in
-		 * other selectors, invalid %eip's and invalid %esp's.
-		 */
-		cs = ucp->uc_mcontext.mc_cs;
-		if (!CS_SECURE(cs)) {
-			uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
-			    td->td_proc->p_pid, td->td_name, cs);
-			ksiginfo_init_trap(&ksi);
-			ksi.ksi_signo = SIGBUS;
-			ksi.ksi_code = BUS_OBJERR;
-			ksi.ksi_trapno = T_PROTFLT;
-			ksi.ksi_addr = (void *)regs->tf_eip;
-			trapsignal(td, &ksi);
-			return (EINVAL);
-		}
-
-		ret = set_fpcontext(td, &ucp->uc_mcontext);
-		if (ret != 0)
-			return (ret);
-		bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs));
-	}
-
-#if defined(COMPAT_43)
-	if (ucp->uc_mcontext.mc_onstack & 1)
-		td->td_sigstk.ss_flags |= SS_ONSTACK;
-	else
-		td->td_sigstk.ss_flags &= ~SS_ONSTACK;
-#endif
-
-	kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
-	return (EJUSTRETURN);
-}
-
-/*
- * Machine dependent boot() routine
- *
- * I haven't seen anything to put here yet
- * Possibly some stuff might be grafted back here from boot()
- */
-void
-cpu_boot(int howto)
-{
-}
-
-/*
- * Flush the D-cache for non-DMA I/O so that the I-cache can
- * be made coherent later.
- */
-void
-cpu_flush_dcache(void *ptr, size_t len)
-{
-	/* Not applicable */
-}
-
-/* Get current clock frequency for the given cpu id. */
-int
-cpu_est_clockrate(int cpu_id, uint64_t *rate)
-{
-	uint64_t tsc1, tsc2;
-	register_t reg;
-
-	if (pcpu_find(cpu_id) == NULL || rate == NULL)
-		return (EINVAL);
-	if ((cpu_feature & CPUID_TSC) == 0)
-		return (EOPNOTSUPP);
-
-#ifdef SMP
-	if (smp_cpus > 1) {
-		/* Schedule ourselves on the indicated cpu. */
-		thread_lock(curthread);
-		sched_bind(curthread, cpu_id);
-		thread_unlock(curthread);
-	}
-#endif
-
-	/* Calibrate by measuring a short delay. */
-	reg = intr_disable();
-	tsc1 = rdtsc();
-	DELAY(1000);
-	tsc2 = rdtsc();
-	intr_restore(reg);
-	*rate = (tsc2 - tsc1) * 1000;
-
-#ifdef SMP
-	if (smp_cpus > 1) {
-		thread_lock(curthread);
-		sched_unbind(curthread);
-		thread_unlock(curthread);
-	}
-#endif
-
-	return (0);
-}
-
-
-/*
- * Shutdown the CPU as much as possible
- */
-void
-cpu_halt(void)
-{
-	for (;;)
-		halt();
-}
-
-static int	idle_mwait = 1;		/* Use MONITOR/MWAIT for short idle. */
-TUNABLE_INT("machdep.idle_mwait", &idle_mwait);
-SYSCTL_INT(_machdep, OID_AUTO, idle_mwait, CTLFLAG_RW, &idle_mwait,
-    0, "Use MONITOR/MWAIT for short idle");
-
-#define	STATE_RUNNING	0x0
-#define	STATE_MWAIT	0x1
-#define	STATE_SLEEPING	0x2
-
-static void
-cpu_idle_hlt(sbintime_t sbt)
-{
-	int *state;
-
-	state = (int *)PCPU_PTR(monitorbuf);
-	*state = STATE_SLEEPING;
-
-	/*
-	 * Since we may be in a critical section from cpu_idle(), if
-	 * an interrupt fires during that critical section we may have
-	 * a pending preemption.  If the CPU halts, then that thread
-	 * may not execute until a later interrupt awakens the CPU.
-	 * To handle this race, check for a runnable thread after
-	 * disabling interrupts and immediately return if one is
-	 * found.  Also, we must absolutely guarentee that hlt is
-	 * the next instruction after sti.  This ensures that any
-	 * interrupt that fires after the call to disable_intr() will
-	 * immediately awaken the CPU from hlt.  Finally, please note
-	 * that on x86 this works fine because of interrupts enabled only
-	 * after the instruction following sti takes place, while IF is set
-	 * to 1 immediately, allowing hlt instruction to acknowledge the
-	 * interrupt.
-	 */
-	disable_intr();
-	if (sched_runnable())
-		enable_intr();
-	else
-		__asm __volatile("sti; hlt");
-	*state = STATE_RUNNING;
-}
-
-/*
- * MWAIT cpu power states.  Lower 4 bits are sub-states.
- */
-#define	MWAIT_C0	0xf0
-#define	MWAIT_C1	0x00
-#define	MWAIT_C2	0x10
-#define	MWAIT_C3	0x20
-#define	MWAIT_C4	0x30
-
-static void
-cpu_idle_mwait(sbintime_t sbt)
-{
-	int *state;
-
-	state = (int *)PCPU_PTR(monitorbuf);
-	*state = STATE_MWAIT;
-
-	/* See comments in cpu_idle_hlt(). */
-	disable_intr();
-	if (sched_runnable()) {
-		enable_intr();
-		*state = STATE_RUNNING;
-		return;
-	}
-	cpu_monitor(state, 0, 0);
-	if (*state == STATE_MWAIT)
-		__asm __volatile("sti; mwait" : : "a" (MWAIT_C1), "c" (0));
-	else
-		enable_intr();
-	*state = STATE_RUNNING;
-}
-
-static void
-cpu_idle_spin(sbintime_t sbt)
-{
-	int *state;
-	int i;
-
-	state = (int *)PCPU_PTR(monitorbuf);
-	*state = STATE_RUNNING;
-
-	/*
-	 * The sched_runnable() call is racy but as long as there is
-	 * a loop missing it one time will have just a little impact if any 
-	 * (and it is much better than missing the check at all).
-	 */
-	for (i = 0; i < 1000; i++) {
-		if (sched_runnable())
-			return;
-		cpu_spinwait();
-	}
-}
-
-void (*cpu_idle_fn)(sbintime_t) = cpu_idle_hlt;
-
-void
-cpu_idle(int busy)
-{
-	sbintime_t sbt = -1;
-
-	CTR2(KTR_SPARE2, "cpu_idle(%d) at %d",
-	    busy, curcpu);
-#if defined(MP_WATCHDOG)
-	ap_watchdog(PCPU_GET(cpuid));
-#endif
-	/* If we are busy - try to use fast methods. */
-	if (busy) {
-		if ((cpu_feature2 & CPUID2_MON) && idle_mwait) {
-			cpu_idle_mwait(busy);
-			goto out;
-		}
-	}
-
-	/* If we have time - switch timers into idle mode. */
-	if (!busy) {
-		critical_enter();
-		sbt = cpu_idleclock();
-	}
-
-	/* Call main idle method. */
-	cpu_idle_fn(sbt);
-
-	/* Switch timers mack into active mode. */
-	if (!busy) {
-		cpu_activeclock();
-		critical_exit();
-	}
-out:
-	CTR2(KTR_SPARE2, "cpu_idle(%d) at %d done",
-	    busy, curcpu);
-}
-
-int
-cpu_idle_wakeup(int cpu)
-{
-	struct pcpu *pcpu;
-	int *state;
-
-	pcpu = pcpu_find(cpu);
-	state = (int *)pcpu->pc_monitorbuf;
-	/*
-	 * This doesn't need to be atomic since missing the race will
-	 * simply result in unnecessary IPIs.
-	 */
-	if (*state == STATE_SLEEPING)
-		return (0);
-	if (*state == STATE_MWAIT)
-		*state = STATE_RUNNING;
-	return (1);
-}
-
-/*
- * Ordered by speed/power consumption.
- */
-struct {
-	void	*id_fn;
-	char	*id_name;
-} idle_tbl[] = {
-	{ cpu_idle_spin, "spin" },
-	{ cpu_idle_mwait, "mwait" },
-	{ cpu_idle_hlt, "hlt" },
-	{ NULL, NULL }
-};
-
-static int
-idle_sysctl_available(SYSCTL_HANDLER_ARGS)
-{
-	char *avail, *p;
-	int error;
-	int i;
-
-	avail = malloc(256, M_TEMP, M_WAITOK);
-	p = avail;
-	for (i = 0; idle_tbl[i].id_name != NULL; i++) {
-		if (strstr(idle_tbl[i].id_name, "mwait") &&
-		    (cpu_feature2 & CPUID2_MON) == 0)
-			continue;
-		p += sprintf(p, "%s%s", p != avail ? ", " : "",
-		    idle_tbl[i].id_name);
-	}
-	error = sysctl_handle_string(oidp, avail, 0, req);
-	free(avail, M_TEMP);
-	return (error);
-}
-
-SYSCTL_PROC(_machdep, OID_AUTO, idle_available, CTLTYPE_STRING | CTLFLAG_RD,
-    0, 0, idle_sysctl_available, "A", "list of available idle functions");
-
-static int
-idle_sysctl(SYSCTL_HANDLER_ARGS)
-{
-	char buf[16];
-	int error;
-	char *p;
-	int i;
-
-	p = "unknown";
-	for (i = 0; idle_tbl[i].id_name != NULL; i++) {
-		if (idle_tbl[i].id_fn == cpu_idle_fn) {
-			p = idle_tbl[i].id_name;
-			break;
-		}
-	}
-	strncpy(buf, p, sizeof(buf));
-	error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
-	if (error != 0 || req->newptr == NULL)
-		return (error);
-	for (i = 0; idle_tbl[i].id_name != NULL; i++) {
-		if (strstr(idle_tbl[i].id_name, "mwait") &&
-		    (cpu_feature2 & CPUID2_MON) == 0)
-			continue;
-		if (strcmp(idle_tbl[i].id_name, buf))
-			continue;
-		cpu_idle_fn = idle_tbl[i].id_fn;
-		return (0);
-	}
-	return (EINVAL);
-}
-
-SYSCTL_PROC(_machdep, OID_AUTO, idle, CTLTYPE_STRING | CTLFLAG_RW, 0, 0,
-    idle_sysctl, "A", "currently selected idle function");
-
-/*
- * Reset registers to default values on exec.
- */
-void
-exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
-{
-	struct trapframe *regs = td->td_frame;
-	struct pcb *pcb = td->td_pcb;
-
-	/* Reset pc->pcb_gs and %gs before possibly invalidating it. */
-	pcb->pcb_gs = _udatasel;
-	load_gs(_udatasel);
-
-	mtx_lock_spin(&dt_lock);
-	if (td->td_proc->p_md.md_ldt)
-		user_ldt_free(td);
-	else
-		mtx_unlock_spin(&dt_lock);
-  
-	bzero((char *)regs, sizeof(struct trapframe));
-	regs->tf_eip = imgp->entry_addr;
-	regs->tf_esp = stack;
-	regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
-	regs->tf_ss = _udatasel;
-	regs->tf_ds = _udatasel;
-	regs->tf_es = _udatasel;
-	regs->tf_fs = _udatasel;
-	regs->tf_cs = _ucodesel;
-
-	/* PS_STRINGS value for BSD/OS binaries.  It is 0 for non-BSD/OS. */
-	regs->tf_ebx = imgp->ps_strings;
-
-        /*
-         * Reset the hardware debug registers if they were in use.
-         * They won't have any meaning for the newly exec'd process.  
-         */
-        if (pcb->pcb_flags & PCB_DBREGS) {
-                pcb->pcb_dr0 = 0;
-                pcb->pcb_dr1 = 0;
-                pcb->pcb_dr2 = 0;
-                pcb->pcb_dr3 = 0;
-                pcb->pcb_dr6 = 0;
-                pcb->pcb_dr7 = 0;
-                if (pcb == curpcb) {
-		        /*
-			 * Clear the debug registers on the running
-			 * CPU, otherwise they will end up affecting
-			 * the next process we switch to.
-			 */
-		        reset_dbregs();
-                }
-                pcb->pcb_flags &= ~PCB_DBREGS;
-        }
-
-	/*
-	 * Initialize the math emulator (if any) for the current process.
-	 * Actually, just clear the bit that says that the emulator has
-	 * been initialized.  Initialization is delayed until the process
-	 * traps to the emulator (if it is done at all) mainly because
-	 * emulators don't provide an entry point for initialization.
-	 */
-	td->td_pcb->pcb_flags &= ~FP_SOFTFP;
-	pcb->pcb_initial_npxcw = __INITIAL_NPXCW__;
-
-	/*
-	 * Drop the FP state if we hold it, so that the process gets a
-	 * clean FP state if it uses the FPU again.
-	 */
-	fpstate_drop(td);
-
-	/*
-	 * XXX - Linux emulator
-	 * Make sure sure edx is 0x0 on entry. Linux binaries depend
-	 * on it.
-	 */
-	td->td_retval[1] = 0;
-}
-
-void
-cpu_setregs(void)
-{
-	unsigned int cr0;
-
-	cr0 = rcr0();
-
-	/*
-	 * CR0_MP, CR0_NE and CR0_TS are set for NPX (FPU) support:
-	 *
-	 * Prepare to trap all ESC (i.e., NPX) instructions and all WAIT
-	 * instructions.  We must set the CR0_MP bit and use the CR0_TS
-	 * bit to control the trap, because setting the CR0_EM bit does
-	 * not cause WAIT instructions to trap.  It's important to trap
-	 * WAIT instructions - otherwise the "wait" variants of no-wait
-	 * control instructions would degenerate to the "no-wait" variants
-	 * after FP context switches but work correctly otherwise.  It's
-	 * particularly important to trap WAITs when there is no NPX -
-	 * otherwise the "wait" variants would always degenerate.
-	 *
-	 * Try setting CR0_NE to get correct error reporting on 486DX's.
-	 * Setting it should fail or do nothing on lesser processors.
-	 */
-	cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM;
-	load_cr0(cr0);
-	load_gs(_udatasel);
-}
-
-u_long bootdev;		/* not a struct cdev *- encoding is different */
-SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
-	CTLFLAG_RD, &bootdev, 0, "Maybe the Boot device (not in struct cdev *format)");
-
-/*
- * Initialize 386 and configure to run kernel
- */
-
-/*
- * Initialize segments & interrupt table
- */
-
-int _default_ldt;
-
-union descriptor gdt[NGDT * MAXCPU];	/* global descriptor table */
-union descriptor ldt[NLDT];		/* local descriptor table */
-static struct gate_descriptor idt0[NIDT];
-struct gate_descriptor *idt = &idt0[0];	/* interrupt descriptor table */
-struct region_descriptor r_gdt, r_idt;	/* table descriptors */
-struct mtx dt_lock;			/* lock for GDT and LDT */
-
-#if defined(I586_CPU) && !defined(NO_F00F_HACK)
-extern int has_f00f_bug;
-#endif
-
-static struct i386tss dblfault_tss;
-static char dblfault_stack[PAGE_SIZE];
-
-extern  vm_offset_t	proc0kstack;
-
-
-/*
- * software prototypes -- in more palatable form.
- *
- * GCODE_SEL through GUDATA_SEL must be in this order for syscall/sysret
- * GUFS_SEL and GUGS_SEL must be in this order (swtch.s knows it)
- */
-struct soft_segment_descriptor gdt_segs[] = {
-/* GNULL_SEL	0 Null Descriptor */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0x0,
-	.ssd_type = 0,
-	.ssd_dpl = SEL_KPL,
-	.ssd_p = 0,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-/* GPRIV_SEL	1 SMP Per-Processor Private Data Descriptor */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = SEL_KPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-/* GUFS_SEL	2 %fs Descriptor for user */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = SEL_UPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-/* GUGS_SEL	3 %gs Descriptor for user */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = SEL_UPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-/* GCODE_SEL	4 Code Descriptor for kernel */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMERA,
-	.ssd_dpl = SEL_KPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-/* GDATA_SEL	5 Data Descriptor for kernel */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = SEL_KPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-/* GUCODE_SEL	6 Code Descriptor for user */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMERA,
-	.ssd_dpl = SEL_UPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-/* GUDATA_SEL	7 Data Descriptor for user */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = SEL_UPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */
-{	.ssd_base = 0x400,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = SEL_KPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-/* GPROC0_SEL	9 Proc 0 Tss Descriptor */
-{
-	.ssd_base = 0x0,
-	.ssd_limit = sizeof(struct i386tss)-1,
-	.ssd_type = SDT_SYS386TSS,
-	.ssd_dpl = 0,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-/* GLDT_SEL	10 LDT Descriptor */
-{	.ssd_base = (int) ldt,
-	.ssd_limit = sizeof(ldt)-1,
-	.ssd_type = SDT_SYSLDT,
-	.ssd_dpl = SEL_UPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-/* GUSERLDT_SEL	11 User LDT Descriptor per process */
-{	.ssd_base = (int) ldt,
-	.ssd_limit = (512 * sizeof(union descriptor)-1),
-	.ssd_type = SDT_SYSLDT,
-	.ssd_dpl = 0,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-/* GPANIC_SEL	12 Panic Tss Descriptor */
-{	.ssd_base = (int) &dblfault_tss,
-	.ssd_limit = sizeof(struct i386tss)-1,
-	.ssd_type = SDT_SYS386TSS,
-	.ssd_dpl = 0,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-/* GBIOSCODE32_SEL 13 BIOS 32-bit interface (32bit Code) */
-{	.ssd_base = 0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMERA,
-	.ssd_dpl = 0,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 1		},
-/* GBIOSCODE16_SEL 14 BIOS 32-bit interface (16bit Code) */
-{	.ssd_base = 0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMERA,
-	.ssd_dpl = 0,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 1		},
-/* GBIOSDATA_SEL 15 BIOS 32-bit interface (Data) */
-{	.ssd_base = 0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = 0,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-/* GBIOSUTIL_SEL 16 BIOS 16-bit interface (Utility) */
-{	.ssd_base = 0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = 0,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 1		},
-/* GBIOSARGS_SEL 17 BIOS 16-bit interface (Arguments) */
-{	.ssd_base = 0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = 0,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 1		},
-/* GNDIS_SEL	18 NDIS Descriptor */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0x0,
-	.ssd_type = 0,
-	.ssd_dpl = 0,
-	.ssd_p = 0,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-};
-
-static struct soft_segment_descriptor ldt_segs[] = {
-	/* Null Descriptor - overwritten by call gate */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0x0,
-	.ssd_type = 0,
-	.ssd_dpl = 0,
-	.ssd_p = 0,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-	/* Null Descriptor - overwritten by call gate */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0x0,
-	.ssd_type = 0,
-	.ssd_dpl = 0,
-	.ssd_p = 0,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-	/* Null Descriptor - overwritten by call gate */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0x0,
-	.ssd_type = 0,
-	.ssd_dpl = 0,
-	.ssd_p = 0,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-	/* Code Descriptor for user */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMERA,
-	.ssd_dpl = SEL_UPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-	/* Null Descriptor - overwritten by call gate */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0x0,
-	.ssd_type = 0,
-	.ssd_dpl = 0,
-	.ssd_p = 0,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 0,
-	.ssd_gran = 0		},
-	/* Data Descriptor for user */
-{	.ssd_base = 0x0,
-	.ssd_limit = 0xfffff,
-	.ssd_type = SDT_MEMRWA,
-	.ssd_dpl = SEL_UPL,
-	.ssd_p = 1,
-	.ssd_xx = 0, .ssd_xx1 = 0,
-	.ssd_def32 = 1,
-	.ssd_gran = 1		},
-};
-
-void
-setidt(idx, func, typ, dpl, selec)
-	int idx;
-	inthand_t *func;
-	int typ;
-	int dpl;
-	int selec;
-{
-	struct gate_descriptor *ip;
-
-	ip = idt + idx;
-	ip->gd_looffset = (int)func;
-	ip->gd_selector = selec;
-	ip->gd_stkcpy = 0;
-	ip->gd_xx = 0;
-	ip->gd_type = typ;
-	ip->gd_dpl = dpl;
-	ip->gd_p = 1;
-	ip->gd_hioffset = ((int)func)>>16 ;
-}
-
-extern inthand_t
-	IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
-	IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
-	IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
-	IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
-	IDTVEC(xmm),
-#ifdef KDTRACE_HOOKS
-	IDTVEC(dtrace_ret),
-#endif
-	IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall);
-
-#ifdef DDB
-/*
- * Display the index and function name of any IDT entries that don't use
- * the default 'rsvd' entry point.
- */
-DB_SHOW_COMMAND(idt, db_show_idt)
-{
-	struct gate_descriptor *ip;
-	int idx;
-	uintptr_t func;
-
-	ip = idt;
-	for (idx = 0; idx < NIDT && !db_pager_quit; idx++) {
-		func = (ip->gd_hioffset << 16 | ip->gd_looffset);
-		if (func != (uintptr_t)&IDTVEC(rsvd)) {
-			db_printf("%3d\t", idx);
-			db_printsym(func, DB_STGY_PROC);
-			db_printf("\n");
-		}
-		ip++;
-	}
-}
-
-/* Show privileged registers. */
-DB_SHOW_COMMAND(sysregs, db_show_sysregs)
-{
-	uint64_t idtr, gdtr;
-
-	idtr = ridt();
-	db_printf("idtr\t0x%08x/%04x\n",
-	    (u_int)(idtr >> 16), (u_int)idtr & 0xffff);
-	gdtr = rgdt();
-	db_printf("gdtr\t0x%08x/%04x\n",
-	    (u_int)(gdtr >> 16), (u_int)gdtr & 0xffff);
-	db_printf("ldtr\t0x%04x\n", rldt());
-	db_printf("tr\t0x%04x\n", rtr());
-	db_printf("cr0\t0x%08x\n", rcr0());
-	db_printf("cr2\t0x%08x\n", rcr2());
-	db_printf("cr3\t0x%08x\n", rcr3());
-	db_printf("cr4\t0x%08x\n", rcr4());
-}
-#endif
-
-void
-sdtossd(sd, ssd)
-	struct segment_descriptor *sd;
-	struct soft_segment_descriptor *ssd;
-{
-	ssd->ssd_base  = (sd->sd_hibase << 24) | sd->sd_lobase;
-	ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit;
-	ssd->ssd_type  = sd->sd_type;
-	ssd->ssd_dpl   = sd->sd_dpl;
-	ssd->ssd_p     = sd->sd_p;
-	ssd->ssd_def32 = sd->sd_def32;
-	ssd->ssd_gran  = sd->sd_gran;
-}
-
-static void
-basemem_setup(void)
-{
-	vm_paddr_t pa;
-	pt_entry_t *pte;
-	int i;
-
-	if (basemem > 640) {
-		printf("Preposterous BIOS basemem of %uK, truncating to 640K\n",
-			basemem);
-		basemem = 640;
-	}
-
-	/*
-	 * XXX if biosbasemem is now < 640, there is a `hole'
-	 * between the end of base memory and the start of
-	 * ISA memory.  The hole may be empty or it may
-	 * contain BIOS code or data.  Map it read/write so
-	 * that the BIOS can write to it.  (Memory from 0 to
-	 * the physical end of the kernel is mapped read-only
-	 * to begin with and then parts of it are remapped.
-	 * The parts that aren't remapped form holes that
-	 * remain read-only and are unused by the kernel.
-	 * The base memory area is below the physical end of
-	 * the kernel and right now forms a read-only hole.
-	 * The part of it from PAGE_SIZE to
-	 * (trunc_page(biosbasemem * 1024) - 1) will be
-	 * remapped and used by the kernel later.)
-	 *
-	 * This code is similar to the code used in
-	 * pmap_mapdev, but since no memory needs to be
-	 * allocated we simply change the mapping.
-	 */
-	for (pa = trunc_page(basemem * 1024);
-	     pa < ISA_HOLE_START; pa += PAGE_SIZE)
-		pmap_kenter(KERNBASE + pa, pa);
-
-	/*
-	 * Map pages between basemem and ISA_HOLE_START, if any, r/w into
-	 * the vm86 page table so that vm86 can scribble on them using
-	 * the vm86 map too.  XXX: why 2 ways for this and only 1 way for
-	 * page 0, at least as initialized here?
-	 */
-	pte = (pt_entry_t *)vm86paddr;
-	for (i = basemem / 4; i < 160; i++)
-		pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U;
-}
-
-/*
- * Populate the (physmap) array with base/bound pairs describing the
- * available physical memory in the system, then test this memory and
- * build the phys_avail array describing the actually-available memory.
- *
- * If we cannot accurately determine the physical memory map, then use
- * value from the 0xE801 call, and failing that, the RTC.
- *
- * Total memory size may be set by the kernel environment variable
- * hw.physmem or the compile-time define MAXMEM.
- *
- * XXX first should be vm_paddr_t.
- */
-static void
-getmemsize(int first)
-{
-	int off, physmap_idx, pa_indx, da_indx;
-	u_long physmem_tunable, memtest;
-	vm_paddr_t physmap[PHYSMAP_SIZE];
-	pt_entry_t *pte;
-	quad_t dcons_addr, dcons_size;
-	int i;
-	int pg_n;
-	u_int extmem;
-	u_int under16;
-	vm_paddr_t pa;
-
-	bzero(physmap, sizeof(physmap));
-
-	/* XXX - some of EPSON machines can't use PG_N */
-	pg_n = PG_N;
-	if (pc98_machine_type & M_EPSON_PC98) {
-		switch (epson_machine_id) {
-#ifdef WB_CACHE
-		default:
-#endif
-		case EPSON_PC486_HX:
-		case EPSON_PC486_HG:
-		case EPSON_PC486_HA:
-			pg_n = 0;
-			break;
-		}
-	}
-
-	under16 = pc98_getmemsize(&basemem, &extmem);
-	basemem_setup();
-
-	physmap[0] = 0;
-	physmap[1] = basemem * 1024;
-	physmap_idx = 2;
-	physmap[physmap_idx] = 0x100000;
-	physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024;
-
-	/*
-	 * Now, physmap contains a map of physical memory.
-	 */
-
-#ifdef SMP
-	/* make hole for AP bootstrap code */
-	physmap[1] = mp_bootaddress(physmap[1]);
-#endif
-
-	/*
-	 * Maxmem isn't the "maximum memory", it's one larger than the
-	 * highest page of the physical address space.  It should be
-	 * called something like "Maxphyspage".  We may adjust this 
-	 * based on ``hw.physmem'' and the results of the memory test.
-	 */
-	Maxmem = atop(physmap[physmap_idx + 1]);
-
-#ifdef MAXMEM
-	Maxmem = MAXMEM / 4;
-#endif
-
-	if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable))
-		Maxmem = atop(physmem_tunable);
-
-	/*
-	 * By default keep the memtest enabled.  Use a general name so that
-	 * one could eventually do more with the code than just disable it.
-	 */
-	memtest = 1;
-	TUNABLE_ULONG_FETCH("hw.memtest.tests", &memtest);
-
-	if (atop(physmap[physmap_idx + 1]) != Maxmem &&
-	    (boothowto & RB_VERBOSE))
-		printf("Physical memory use set to %ldK\n", Maxmem * 4);
-
-	/*
-	 * If Maxmem has been increased beyond what the system has detected,
-	 * extend the last memory segment to the new limit.
-	 */ 
-	if (atop(physmap[physmap_idx + 1]) < Maxmem)
-		physmap[physmap_idx + 1] = ptoa((vm_paddr_t)Maxmem);
-
-	/*
-	 * We need to divide chunk if Maxmem is larger than 16MB and
-	 * under 16MB area is not full of memory.
-	 * (1) system area (15-16MB region) is cut off
-	 * (2) extended memory is only over 16MB area (ex. Melco "HYPERMEMORY")
-	 */
-	if ((under16 != 16 * 1024) && (extmem > 15 * 1024)) {
-		/* 15M - 16M region is cut off, so need to divide chunk */
-		physmap[physmap_idx + 1] = under16 * 1024;
-		physmap_idx += 2;
-		physmap[physmap_idx] = 0x1000000;
-		physmap[physmap_idx + 1] = physmap[2] + extmem * 1024;
-	}
-
-	/* call pmap initialization to make new kernel address space */
-	pmap_bootstrap(first);
-
-	/*
-	 * Size up each available chunk of physical memory.
-	 */
-	physmap[0] = PAGE_SIZE;		/* mask off page 0 */
-	pa_indx = 0;
-	da_indx = 1;
-	phys_avail[pa_indx++] = physmap[0];
-	phys_avail[pa_indx] = physmap[0];
-	dump_avail[da_indx] = physmap[0];
-	pte = CMAP3;
-
-	/*
-	 * Get dcons buffer address
-	 */
-	if (getenv_quad("dcons.addr", &dcons_addr) == 0 ||
-	    getenv_quad("dcons.size", &dcons_size) == 0)
-		dcons_addr = 0;
-
-	/*
-	 * physmap is in bytes, so when converting to page boundaries,
-	 * round up the start address and round down the end address.
-	 */
-	for (i = 0; i <= physmap_idx; i += 2) {
-		vm_paddr_t end;
-
-		end = ptoa((vm_paddr_t)Maxmem);
-		if (physmap[i + 1] < end)
-			end = trunc_page(physmap[i + 1]);
-		for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) {
-			int tmp, page_bad, full;
-			int *ptr = (int *)CADDR3;
-
-			full = FALSE;
-			/*
-			 * block out kernel memory as not available.
-			 */
-			if (pa >= KERNLOAD && pa < first)
-				goto do_dump_avail;
-
-			/*
-			 * block out dcons buffer
-			 */
-			if (dcons_addr > 0
-			    && pa >= trunc_page(dcons_addr)
-			    && pa < dcons_addr + dcons_size)
-				goto do_dump_avail;
-
-			page_bad = FALSE;
-			if (memtest == 0)
-				goto skip_memtest;
-
-			/*
-			 * map page into kernel: valid, read/write,non-cacheable
-			 */
-			*pte = pa | PG_V | PG_RW | pg_n;
-			invltlb();
-
-			tmp = *(int *)ptr;
-			/*
-			 * Test for alternating 1's and 0's
-			 */
-			*(volatile int *)ptr = 0xaaaaaaaa;
-			if (*(volatile int *)ptr != 0xaaaaaaaa)
-				page_bad = TRUE;
-			/*
-			 * Test for alternating 0's and 1's
-			 */
-			*(volatile int *)ptr = 0x55555555;
-			if (*(volatile int *)ptr != 0x55555555)
-				page_bad = TRUE;
-			/*
-			 * Test for all 1's
-			 */
-			*(volatile int *)ptr = 0xffffffff;
-			if (*(volatile int *)ptr != 0xffffffff)
-				page_bad = TRUE;
-			/*
-			 * Test for all 0's
-			 */
-			*(volatile int *)ptr = 0x0;
-			if (*(volatile int *)ptr != 0x0)
-				page_bad = TRUE;
-			/*
-			 * Restore original value.
-			 */
-			*(int *)ptr = tmp;
-
-skip_memtest:
-			/*
-			 * Adjust array of valid/good pages.
-			 */
-			if (page_bad == TRUE)
-				continue;
-			/*
-			 * If this good page is a continuation of the
-			 * previous set of good pages, then just increase
-			 * the end pointer. Otherwise start a new chunk.
-			 * Note that "end" points one higher than end,
-			 * making the range >= start and < end.
-			 * If we're also doing a speculative memory
-			 * test and we at or past the end, bump up Maxmem
-			 * so that we keep going. The first bad page
-			 * will terminate the loop.
-			 */
-			if (phys_avail[pa_indx] == pa) {
-				phys_avail[pa_indx] += PAGE_SIZE;
-			} else {
-				pa_indx++;
-				if (pa_indx == PHYS_AVAIL_ARRAY_END) {
-					printf(
-		"Too many holes in the physical address space, giving up\n");
-					pa_indx--;
-					full = TRUE;
-					goto do_dump_avail;
-				}
-				phys_avail[pa_indx++] = pa;	/* start */
-				phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */
-			}
-			physmem++;
-do_dump_avail:
-			if (dump_avail[da_indx] == pa) {
-				dump_avail[da_indx] += PAGE_SIZE;
-			} else {
-				da_indx++;
-				if (da_indx == DUMP_AVAIL_ARRAY_END) {
-					da_indx--;
-					goto do_next;
-				}
-				dump_avail[da_indx++] = pa;	/* start */
-				dump_avail[da_indx] = pa + PAGE_SIZE; /* end */
-			}
-do_next:
-			if (full)
-				break;
-		}
-	}
-	*pte = 0;
-	invltlb();
-	
-	/*
-	 * XXX
-	 * The last chunk must contain at least one page plus the message
-	 * buffer to avoid complicating other code (message buffer address
-	 * calculation, etc.).
-	 */
-	while (phys_avail[pa_indx - 1] + PAGE_SIZE +
-	    round_page(msgbufsize) >= phys_avail[pa_indx]) {
-		physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]);
-		phys_avail[pa_indx--] = 0;
-		phys_avail[pa_indx--] = 0;
-	}
-
-	Maxmem = atop(phys_avail[pa_indx]);
-
-	/* Trim off space for the message buffer. */
-	phys_avail[pa_indx] -= round_page(msgbufsize);
-
-	/* Map the message buffer. */
-	for (off = 0; off < round_page(msgbufsize); off += PAGE_SIZE)
-		pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] +
-		    off);
-
-	PT_UPDATES_FLUSH();
-}
-
-void
-init386(first)
-	int first;
-{
-	struct gate_descriptor *gdp;
-	int gsel_tss, metadata_missing, x, pa;
-	size_t kstack0_sz;
-	struct pcpu *pc;
-
-	thread0.td_kstack = proc0kstack;
-	thread0.td_kstack_pages = KSTACK_PAGES;
-	kstack0_sz = thread0.td_kstack_pages * PAGE_SIZE;
-	thread0.td_pcb = (struct pcb *)(thread0.td_kstack + kstack0_sz) - 1;
-
-	/*
- 	 * This may be done better later if it gets more high level
- 	 * components in it. If so just link td->td_proc here.
-	 */
-	proc_linkup0(&proc0, &thread0);
-
-	/*
-	 * Initialize DMAC
-	 */
-	pc98_init_dmac();
-
-	metadata_missing = 0;
-	if (bootinfo.bi_modulep) {
-		preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE;
-		preload_bootstrap_relocate(KERNBASE);
-	} else {
-		metadata_missing = 1;
-	}
-	if (envmode == 1)
-		kern_envp = static_env;
-	else if (bootinfo.bi_envp)
-		kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE;
-
-	/* Init basic tunables, hz etc */
-	init_param1();
-
-	/*
-	 * Make gdt memory segments.  All segments cover the full 4GB
-	 * of address space and permissions are enforced at page level.
-	 */
-	gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1);
-	gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1);
-	gdt_segs[GUCODE_SEL].ssd_limit = atop(0 - 1);
-	gdt_segs[GUDATA_SEL].ssd_limit = atop(0 - 1);
-	gdt_segs[GUFS_SEL].ssd_limit = atop(0 - 1);
-	gdt_segs[GUGS_SEL].ssd_limit = atop(0 - 1);
-
-	pc = &__pcpu[0];
-	gdt_segs[GPRIV_SEL].ssd_limit = atop(0 - 1);
-	gdt_segs[GPRIV_SEL].ssd_base = (int) pc;
-	gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss;
-
-	for (x = 0; x < NGDT; x++)
-		ssdtosd(&gdt_segs[x], &gdt[x].sd);
-
-	r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
-	r_gdt.rd_base =  (int) gdt;
-	mtx_init(&dt_lock, "descriptor tables", NULL, MTX_SPIN);
-	lgdt(&r_gdt);
-
-	pcpu_init(pc, 0, sizeof(struct pcpu));
-	for (pa = first; pa < first + DPCPU_SIZE; pa += PAGE_SIZE)
-		pmap_kenter(pa + KERNBASE, pa);
-	dpcpu_init((void *)(first + KERNBASE), 0);
-	first += DPCPU_SIZE;
-	PCPU_SET(prvspace, pc);
-	PCPU_SET(curthread, &thread0);
-	PCPU_SET(curpcb, thread0.td_pcb);
-
-	/*
-	 * Initialize mutexes.
-	 *
-	 * icu_lock: in order to allow an interrupt to occur in a critical
-	 * 	     section, to set pcpu->ipending (etc...) properly, we
-	 *	     must be able to get the icu lock, so it can't be
-	 *	     under witness.
-	 */
-	mutex_init();
-	mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS | MTX_NOPROFILE);
-
-	/* make ldt memory segments */
-	ldt_segs[LUCODE_SEL].ssd_limit = atop(0 - 1);
-	ldt_segs[LUDATA_SEL].ssd_limit = atop(0 - 1);
-	for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++)
-		ssdtosd(&ldt_segs[x], &ldt[x].sd);
-
-	_default_ldt = GSEL(GLDT_SEL, SEL_KPL);
-	lldt(_default_ldt);
-	PCPU_SET(currentldt, _default_ldt);
-
-	/* exceptions */
-	for (x = 0; x < NIDT; x++)
-		setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL,
-		    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_DE, &IDTVEC(div),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_DB, &IDTVEC(dbg),  SDT_SYS386IGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_NMI, &IDTVEC(nmi),  SDT_SYS386IGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
- 	setidt(IDT_BP, &IDTVEC(bpt),  SDT_SYS386IGT, SEL_UPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_OF, &IDTVEC(ofl),  SDT_SYS386TGT, SEL_UPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_BR, &IDTVEC(bnd),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_UD, &IDTVEC(ill),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_NM, &IDTVEC(dna),  SDT_SYS386TGT, SEL_KPL
-	    , GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_DF, 0,  SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL));
-	setidt(IDT_FPUGP, &IDTVEC(fpusegm),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_TS, &IDTVEC(tss),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_NP, &IDTVEC(missing),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_SS, &IDTVEC(stk),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_GP, &IDTVEC(prot),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_PF, &IDTVEC(page),  SDT_SYS386IGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_MF, &IDTVEC(fpu),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_AC, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_MC, &IDTVEC(mchk),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_XF, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
- 	setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-#ifdef KDTRACE_HOOKS
-	setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret), SDT_SYS386TGT, SEL_UPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-#endif
-
-	r_idt.rd_limit = sizeof(idt0) - 1;
-	r_idt.rd_base = (int) idt;
-	lidt(&r_idt);
-
-	/*
-	 * Initialize the i8254 before the console so that console
-	 * initialization can use DELAY().
-	 */
-	i8254_init();
-
-	/*
-	 * Initialize the console before we print anything out.
-	 */
-	cninit();
-
-	if (metadata_missing)
-		printf("WARNING: loader(8) metadata is missing!\n");
-
-#ifdef DEV_ISA
-#ifdef DEV_ATPIC
-	atpic_startup();
-#else
-	/* Reset and mask the atpics and leave them shut down. */
-	atpic_reset();
-
-	/*
-	 * Point the ICU spurious interrupt vectors at the APIC spurious
-	 * interrupt handler.
-	 */
-	setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYS386IGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYS386IGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-#endif
-#endif
-
-#ifdef DDB
-	ksym_start = bootinfo.bi_symtab;
-	ksym_end = bootinfo.bi_esymtab;
-#endif
-
-	kdb_init();
-
-#ifdef KDB
-	if (boothowto & RB_KDB)
-		kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
-#endif
-
-	finishidentcpu();	/* Final stage of CPU initialization */
-	setidt(IDT_UD, &IDTVEC(ill),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	setidt(IDT_GP, &IDTVEC(prot),  SDT_SYS386TGT, SEL_KPL,
-	    GSEL(GCODE_SEL, SEL_KPL));
-	initializecpu();	/* Initialize CPU registers */
-	initializecpucache();
-
-	/* make an initial tss so cpu can get interrupt stack on syscall! */
-	/* Note: -16 is so we can grow the trapframe if we came from vm86 */
-	PCPU_SET(common_tss.tss_esp0, thread0.td_kstack +
-	    kstack0_sz - sizeof(struct pcb) - 16);
-	PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL));
-	gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
-	PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd);
-	PCPU_SET(common_tssd, *PCPU_GET(tss_gdt));
-	PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16);
-	ltr(gsel_tss);
-
-	/* pointer to selector slot for %fs/%gs */
-	PCPU_SET(fsgs_gdt, &gdt[GUFS_SEL].sd);
-
-	dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 =
-	    dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)];
-	dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 =
-	    dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL);
-	dblfault_tss.tss_cr3 = (int)IdlePTD;
-	dblfault_tss.tss_eip = (int)dblfault_handler;
-	dblfault_tss.tss_eflags = PSL_KERNEL;
-	dblfault_tss.tss_ds = dblfault_tss.tss_es =
-	    dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL);
-	dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL);
-	dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL);
-	dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL);
-
-	vm86_initialize();
-	getmemsize(first);
-	init_param2(physmem);
-
-	/* now running on new page tables, configured,and u/iom is accessible */
-
-	msgbufinit(msgbufp, msgbufsize);
-
-	/* make a call gate to reenter kernel with */
-	gdp = &ldt[LSYS5CALLS_SEL].gd;
-
-	x = (int) &IDTVEC(lcall_syscall);
-	gdp->gd_looffset = x;
-	gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL);
-	gdp->gd_stkcpy = 1;
-	gdp->gd_type = SDT_SYS386CGT;
-	gdp->gd_dpl = SEL_UPL;
-	gdp->gd_p = 1;
-	gdp->gd_hioffset = x >> 16;
-
-	/* XXX does this work? */
-	/* XXX yes! */
-	ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
-	ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL];
-
-	/* transfer to user mode */
-
-	_ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
-	_udatasel = GSEL(GUDATA_SEL, SEL_UPL);
-
-	/* setup proc 0's pcb */
-	thread0.td_pcb->pcb_flags = 0;
-	thread0.td_pcb->pcb_cr3 = (int)IdlePTD;
-	thread0.td_pcb->pcb_ext = 0;
-	thread0.td_frame = &proc0_tf;
-}
-
-void
-cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
-{
-
-}
-
-void
-spinlock_enter(void)
-{
-	struct thread *td;
-	register_t flags;
-
-	td = curthread;
-	if (td->td_md.md_spinlock_count == 0) {
-		flags = intr_disable();
-		td->td_md.md_spinlock_count = 1;
-		td->td_md.md_saved_flags = flags;
-	} else
-		td->td_md.md_spinlock_count++;
-	critical_enter();
-}
-
-void
-spinlock_exit(void)
-{
-	struct thread *td;
-	register_t flags;
-
-	td = curthread;
-	critical_exit();
-	flags = td->td_md.md_saved_flags;
-	td->td_md.md_spinlock_count--;
-	if (td->td_md.md_spinlock_count == 0)
-		intr_restore(flags);
-}
-
-#if defined(I586_CPU) && !defined(NO_F00F_HACK)
-static void f00f_hack(void *unused);
-SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL);
-
-static void
-f00f_hack(void *unused)
-{
-	struct gate_descriptor *new_idt;
-	vm_offset_t tmp;
-
-	if (!has_f00f_bug)
-		return;
-
-	GIANT_REQUIRED;
-
-	printf("Intel Pentium detected, installing workaround for F00F bug\n");
-
-	tmp = kmem_malloc(kernel_arena, PAGE_SIZE * 2, M_WAITOK | M_ZERO);
-	if (tmp == 0)
-		panic("kmem_alloc returned 0");
-
-	/* Put the problematic entry (#6) at the end of the lower page. */
-	new_idt = (struct gate_descriptor*)
-	    (tmp + PAGE_SIZE - 7 * sizeof(struct gate_descriptor));
-	bcopy(idt, new_idt, sizeof(idt0));
-	r_idt.rd_base = (u_int)new_idt;
-	lidt(&r_idt);
-	idt = new_idt;
-	pmap_protect(kernel_pmap, tmp, tmp + PAGE_SIZE, VM_PROT_READ);
-}
-#endif /* defined(I586_CPU) && !NO_F00F_HACK */
-
-/*
- * Construct a PCB from a trapframe. This is called from kdb_trap() where
- * we want to start a backtrace from the function that caused us to enter
- * the debugger. We have the context in the trapframe, but base the trace
- * on the PCB. The PCB doesn't have to be perfect, as long as it contains
- * enough for a backtrace.
- */
-void
-makectx(struct trapframe *tf, struct pcb *pcb)
-{
-
-	pcb->pcb_edi = tf->tf_edi;
-	pcb->pcb_esi = tf->tf_esi;
-	pcb->pcb_ebp = tf->tf_ebp;
-	pcb->pcb_ebx = tf->tf_ebx;
-	pcb->pcb_eip = tf->tf_eip;
-	pcb->pcb_esp = (ISPL(tf->tf_cs)) ? tf->tf_esp : (int)(tf + 1) - 8;
-}
-
-int
-ptrace_set_pc(struct thread *td, u_long addr)
-{
-
-	td->td_frame->tf_eip = addr;
-	return (0);
-}
-
-int
-ptrace_single_step(struct thread *td)
-{
-	td->td_frame->tf_eflags |= PSL_T;
-	return (0);
-}
-
-int
-ptrace_clear_single_step(struct thread *td)
-{
-	td->td_frame->tf_eflags &= ~PSL_T;
-	return (0);
-}
-
-int
-fill_regs(struct thread *td, struct reg *regs)
-{
-	struct pcb *pcb;
-	struct trapframe *tp;
-
-	tp = td->td_frame;
-	pcb = td->td_pcb;
-	regs->r_gs = pcb->pcb_gs;
-	return (fill_frame_regs(tp, regs));
-}
-
-int
-fill_frame_regs(struct trapframe *tp, struct reg *regs)
-{
-	regs->r_fs = tp->tf_fs;
-	regs->r_es = tp->tf_es;
-	regs->r_ds = tp->tf_ds;
-	regs->r_edi = tp->tf_edi;
-	regs->r_esi = tp->tf_esi;
-	regs->r_ebp = tp->tf_ebp;
-	regs->r_ebx = tp->tf_ebx;
-	regs->r_edx = tp->tf_edx;
-	regs->r_ecx = tp->tf_ecx;
-	regs->r_eax = tp->tf_eax;
-	regs->r_eip = tp->tf_eip;
-	regs->r_cs = tp->tf_cs;
-	regs->r_eflags = tp->tf_eflags;
-	regs->r_esp = tp->tf_esp;
-	regs->r_ss = tp->tf_ss;
-	return (0);
-}
-
-int
-set_regs(struct thread *td, struct reg *regs)
-{
-	struct pcb *pcb;
-	struct trapframe *tp;
-
-	tp = td->td_frame;
-	if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
-	    !CS_SECURE(regs->r_cs))
-		return (EINVAL);
-	pcb = td->td_pcb;
-	tp->tf_fs = regs->r_fs;
-	tp->tf_es = regs->r_es;
-	tp->tf_ds = regs->r_ds;
-	tp->tf_edi = regs->r_edi;
-	tp->tf_esi = regs->r_esi;
-	tp->tf_ebp = regs->r_ebp;
-	tp->tf_ebx = regs->r_ebx;
-	tp->tf_edx = regs->r_edx;
-	tp->tf_ecx = regs->r_ecx;
-	tp->tf_eax = regs->r_eax;
-	tp->tf_eip = regs->r_eip;
-	tp->tf_cs = regs->r_cs;
-	tp->tf_eflags = regs->r_eflags;
-	tp->tf_esp = regs->r_esp;
-	tp->tf_ss = regs->r_ss;
-	pcb->pcb_gs = regs->r_gs;
-	return (0);
-}
-
-#ifdef CPU_ENABLE_SSE
-static void
-fill_fpregs_xmm(sv_xmm, sv_87)
-	struct savexmm *sv_xmm;
-	struct save87 *sv_87;
-{
-	register struct env87 *penv_87 = &sv_87->sv_env;
-	register struct envxmm *penv_xmm = &sv_xmm->sv_env;
-	int i;
-
-	bzero(sv_87, sizeof(*sv_87));
-
-	/* FPU control/status */
-	penv_87->en_cw = penv_xmm->en_cw;
-	penv_87->en_sw = penv_xmm->en_sw;
-	penv_87->en_tw = penv_xmm->en_tw;
-	penv_87->en_fip = penv_xmm->en_fip;
-	penv_87->en_fcs = penv_xmm->en_fcs;
-	penv_87->en_opcode = penv_xmm->en_opcode;
-	penv_87->en_foo = penv_xmm->en_foo;
-	penv_87->en_fos = penv_xmm->en_fos;
-
-	/* FPU registers */
-	for (i = 0; i < 8; ++i)
-		sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
-}
-
-static void
-set_fpregs_xmm(sv_87, sv_xmm)
-	struct save87 *sv_87;
-	struct savexmm *sv_xmm;
-{
-	register struct env87 *penv_87 = &sv_87->sv_env;
-	register struct envxmm *penv_xmm = &sv_xmm->sv_env;
-	int i;
-
-	/* FPU control/status */
-	penv_xmm->en_cw = penv_87->en_cw;
-	penv_xmm->en_sw = penv_87->en_sw;
-	penv_xmm->en_tw = penv_87->en_tw;
-	penv_xmm->en_fip = penv_87->en_fip;
-	penv_xmm->en_fcs = penv_87->en_fcs;
-	penv_xmm->en_opcode = penv_87->en_opcode;
-	penv_xmm->en_foo = penv_87->en_foo;
-	penv_xmm->en_fos = penv_87->en_fos;
-
-	/* FPU registers */
-	for (i = 0; i < 8; ++i)
-		sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
-}
-#endif /* CPU_ENABLE_SSE */
-
-int
-fill_fpregs(struct thread *td, struct fpreg *fpregs)
-{
-
-	KASSERT(td == curthread || TD_IS_SUSPENDED(td) ||
-	    P_SHOULDSTOP(td->td_proc),
-	    ("not suspended thread %p", td));
-#ifdef DEV_NPX
-	npxgetregs(td);
-#else
-	bzero(fpregs, sizeof(*fpregs));
-#endif
-#ifdef CPU_ENABLE_SSE
-	if (cpu_fxsr)
-		fill_fpregs_xmm(&td->td_pcb->pcb_user_save.sv_xmm,
-		    (struct save87 *)fpregs);
-	else
-#endif /* CPU_ENABLE_SSE */
-		bcopy(&td->td_pcb->pcb_user_save.sv_87, fpregs,
-		    sizeof(*fpregs));
-	return (0);
-}
-
-int
-set_fpregs(struct thread *td, struct fpreg *fpregs)
-{
-
-#ifdef CPU_ENABLE_SSE
-	if (cpu_fxsr)
-		set_fpregs_xmm((struct save87 *)fpregs,
-		    &td->td_pcb->pcb_user_save.sv_xmm);
-	else
-#endif /* CPU_ENABLE_SSE */
-		bcopy(fpregs, &td->td_pcb->pcb_user_save.sv_87,
-		    sizeof(*fpregs));
-#ifdef DEV_NPX
-	npxuserinited(td);
-#endif
-	return (0);
-}
-
-/*
- * Get machine context.
- */
-int
-get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
-{
-	struct trapframe *tp;
-	struct segment_descriptor *sdp;
-
-	tp = td->td_frame;
-
-	PROC_LOCK(curthread->td_proc);
-	mcp->mc_onstack = sigonstack(tp->tf_esp);
-	PROC_UNLOCK(curthread->td_proc);
-	mcp->mc_gs = td->td_pcb->pcb_gs;
-	mcp->mc_fs = tp->tf_fs;
-	mcp->mc_es = tp->tf_es;
-	mcp->mc_ds = tp->tf_ds;
-	mcp->mc_edi = tp->tf_edi;
-	mcp->mc_esi = tp->tf_esi;
-	mcp->mc_ebp = tp->tf_ebp;
-	mcp->mc_isp = tp->tf_isp;
-	mcp->mc_eflags = tp->tf_eflags;
-	if (flags & GET_MC_CLEAR_RET) {
-		mcp->mc_eax = 0;
-		mcp->mc_edx = 0;
-		mcp->mc_eflags &= ~PSL_C;
-	} else {
-		mcp->mc_eax = tp->tf_eax;
-		mcp->mc_edx = tp->tf_edx;
-	}
-	mcp->mc_ebx = tp->tf_ebx;
-	mcp->mc_ecx = tp->tf_ecx;
-	mcp->mc_eip = tp->tf_eip;
-	mcp->mc_cs = tp->tf_cs;
-	mcp->mc_esp = tp->tf_esp;
-	mcp->mc_ss = tp->tf_ss;
-	mcp->mc_len = sizeof(*mcp);
-	get_fpcontext(td, mcp);
-	sdp = &td->td_pcb->pcb_fsd;
-	mcp->mc_fsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
-	sdp = &td->td_pcb->pcb_gsd;
-	mcp->mc_gsbase = sdp->sd_hibase << 24 | sdp->sd_lobase;
-	mcp->mc_flags = 0;
-	bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
-	return (0);
-}
-
-/*
- * Set machine context.
- *
- * However, we don't set any but the user modifiable flags, and we won't
- * touch the cs selector.
- */
-int
-set_mcontext(struct thread *td, const mcontext_t *mcp)
-{
-	struct trapframe *tp;
-	int eflags, ret;
-
-	tp = td->td_frame;
-	if (mcp->mc_len != sizeof(*mcp))
-		return (EINVAL);
-	eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
-	    (tp->tf_eflags & ~PSL_USERCHANGE);
-	if ((ret = set_fpcontext(td, mcp)) == 0) {
-		tp->tf_fs = mcp->mc_fs;
-		tp->tf_es = mcp->mc_es;
-		tp->tf_ds = mcp->mc_ds;
-		tp->tf_edi = mcp->mc_edi;
-		tp->tf_esi = mcp->mc_esi;
-		tp->tf_ebp = mcp->mc_ebp;
-		tp->tf_ebx = mcp->mc_ebx;
-		tp->tf_edx = mcp->mc_edx;
-		tp->tf_ecx = mcp->mc_ecx;
-		tp->tf_eax = mcp->mc_eax;
-		tp->tf_eip = mcp->mc_eip;
-		tp->tf_eflags = eflags;
-		tp->tf_esp = mcp->mc_esp;
-		tp->tf_ss = mcp->mc_ss;
-		td->td_pcb->pcb_gs = mcp->mc_gs;
-		ret = 0;
-	}
-	return (ret);
-}
-
-static void
-get_fpcontext(struct thread *td, mcontext_t *mcp)
-{
-
-#ifndef DEV_NPX
-	mcp->mc_fpformat = _MC_FPFMT_NODEV;
-	mcp->mc_ownedfp = _MC_FPOWNED_NONE;
-	bzero(mcp->mc_fpstate, sizeof(mcp->mc_fpstate));
-#else
-	mcp->mc_ownedfp = npxgetregs(td);
-	bcopy(&td->td_pcb->pcb_user_save, &mcp->mc_fpstate[0],
-	    sizeof(mcp->mc_fpstate));
-	mcp->mc_fpformat = npxformat();
-#endif
-}
-
-static int
-set_fpcontext(struct thread *td, const mcontext_t *mcp)
-{
-
-	if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
-		return (0);
-	else if (mcp->mc_fpformat != _MC_FPFMT_387 &&
-	    mcp->mc_fpformat != _MC_FPFMT_XMM)
-		return (EINVAL);
-	else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
-		/* We don't care what state is left in the FPU or PCB. */
-		fpstate_drop(td);
-	else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
-	    mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
-#ifdef DEV_NPX
-#ifdef CPU_ENABLE_SSE
-		if (cpu_fxsr)
-			((union savefpu *)&mcp->mc_fpstate)->sv_xmm.sv_env.
-			    en_mxcsr &= cpu_mxcsr_mask;
-#endif
-		npxsetregs(td, (union savefpu *)&mcp->mc_fpstate);
-#endif
-	} else
-		return (EINVAL);
-	return (0);
-}
-
-static void
-fpstate_drop(struct thread *td)
-{
-
-	KASSERT(PCB_USER_FPU(td->td_pcb), ("fpstate_drop: kernel-owned fpu"));
-	critical_enter();
-#ifdef DEV_NPX
-	if (PCPU_GET(fpcurthread) == td)
-		npxdrop();
-#endif
-	/*
-	 * XXX force a full drop of the npx.  The above only drops it if we
-	 * owned it.  npxgetregs() has the same bug in the !cpu_fxsr case.
-	 *
-	 * XXX I don't much like npxgetregs()'s semantics of doing a full
-	 * drop.  Dropping only to the pcb matches fnsave's behaviour.
-	 * We only need to drop to !PCB_INITDONE in sendsig().  But
-	 * sendsig() is the only caller of npxgetregs()... perhaps we just
-	 * have too many layers.
-	 */
-	curthread->td_pcb->pcb_flags &= ~(PCB_NPXINITDONE |
-	    PCB_NPXUSERINITDONE);
-	critical_exit();
-}
-
-int
-fill_dbregs(struct thread *td, struct dbreg *dbregs)
-{
-	struct pcb *pcb;
-
-	if (td == NULL) {
-		dbregs->dr[0] = rdr0();
-		dbregs->dr[1] = rdr1();
-		dbregs->dr[2] = rdr2();
-		dbregs->dr[3] = rdr3();
-		dbregs->dr[4] = rdr4();
-		dbregs->dr[5] = rdr5();
-		dbregs->dr[6] = rdr6();
-		dbregs->dr[7] = rdr7();
-	} else {
-		pcb = td->td_pcb;
-		dbregs->dr[0] = pcb->pcb_dr0;
-		dbregs->dr[1] = pcb->pcb_dr1;
-		dbregs->dr[2] = pcb->pcb_dr2;
-		dbregs->dr[3] = pcb->pcb_dr3;
-		dbregs->dr[4] = 0;
-		dbregs->dr[5] = 0;
-		dbregs->dr[6] = pcb->pcb_dr6;
-		dbregs->dr[7] = pcb->pcb_dr7;
-	}
-	return (0);
-}
-
-int
-set_dbregs(struct thread *td, struct dbreg *dbregs)
-{
-	struct pcb *pcb;
-	int i;
-
-	if (td == NULL) {
-		load_dr0(dbregs->dr[0]);
-		load_dr1(dbregs->dr[1]);
-		load_dr2(dbregs->dr[2]);
-		load_dr3(dbregs->dr[3]);
-		load_dr4(dbregs->dr[4]);
-		load_dr5(dbregs->dr[5]);
-		load_dr6(dbregs->dr[6]);
-		load_dr7(dbregs->dr[7]);
-	} else {
-		/*
-		 * Don't let an illegal value for dr7 get set.	Specifically,
-		 * check for undefined settings.  Setting these bit patterns
-		 * result in undefined behaviour and can lead to an unexpected
-		 * TRCTRAP.
-		 */
-		for (i = 0; i < 4; i++) {
-			if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02)
-				return (EINVAL);
-			if (DBREG_DR7_LEN(dbregs->dr[7], i) == 0x02)
-				return (EINVAL);
-		}
-		
-		pcb = td->td_pcb;
-		
-		/*
-		 * Don't let a process set a breakpoint that is not within the
-		 * process's address space.  If a process could do this, it
-		 * could halt the system by setting a breakpoint in the kernel
-		 * (if ddb was enabled).  Thus, we need to check to make sure
-		 * that no breakpoints are being enabled for addresses outside
-		 * process's address space.
-		 *
-		 * XXX - what about when the watched area of the user's
-		 * address space is written into from within the kernel
-		 * ... wouldn't that still cause a breakpoint to be generated
-		 * from within kernel mode?
-		 */
-
-		if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) {
-			/* dr0 is enabled */
-			if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS)
-				return (EINVAL);
-		}
-			
-		if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) {
-			/* dr1 is enabled */
-			if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS)
-				return (EINVAL);
-		}
-			
-		if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) {
-			/* dr2 is enabled */
-			if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS)
-				return (EINVAL);
-		}
-			
-		if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) {
-			/* dr3 is enabled */
-			if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS)
-				return (EINVAL);
-		}
-
-		pcb->pcb_dr0 = dbregs->dr[0];
-		pcb->pcb_dr1 = dbregs->dr[1];
-		pcb->pcb_dr2 = dbregs->dr[2];
-		pcb->pcb_dr3 = dbregs->dr[3];
-		pcb->pcb_dr6 = dbregs->dr[6];
-		pcb->pcb_dr7 = dbregs->dr[7];
-
-		pcb->pcb_flags |= PCB_DBREGS;
-	}
-
-	return (0);
-}
-
-/*
- * Return > 0 if a hardware breakpoint has been hit, and the
- * breakpoint was in user space.  Return 0, otherwise.
- */
-int
-user_dbreg_trap(void)
-{
-        u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
-        u_int32_t bp;       /* breakpoint bits extracted from dr6 */
-        int nbp;            /* number of breakpoints that triggered */
-        caddr_t addr[4];    /* breakpoint addresses */
-        int i;
-        
-        dr7 = rdr7();
-        if ((dr7 & 0x000000ff) == 0) {
-                /*
-                 * all GE and LE bits in the dr7 register are zero,
-                 * thus the trap couldn't have been caused by the
-                 * hardware debug registers
-                 */
-                return 0;
-        }
-
-        nbp = 0;
-        dr6 = rdr6();
-        bp = dr6 & 0x0000000f;
-
-        if (!bp) {
-                /*
-                 * None of the breakpoint bits are set meaning this
-                 * trap was not caused by any of the debug registers
-                 */
-                return 0;
-        }
-
-        /*
-         * at least one of the breakpoints were hit, check to see
-         * which ones and if any of them are user space addresses
-         */
-
-        if (bp & 0x01) {
-                addr[nbp++] = (caddr_t)rdr0();
-        }
-        if (bp & 0x02) {
-                addr[nbp++] = (caddr_t)rdr1();
-        }
-        if (bp & 0x04) {
-                addr[nbp++] = (caddr_t)rdr2();
-        }
-        if (bp & 0x08) {
-                addr[nbp++] = (caddr_t)rdr3();
-        }
-
-        for (i = 0; i < nbp; i++) {
-                if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) {
-                        /*
-                         * addr[i] is in user space
-                         */
-                        return nbp;
-                }
-        }
-
-        /*
-         * None of the breakpoints are in user space.
-         */
-        return 0;
-}
-
-#ifdef KDB
-
-/*
- * Provide inb() and outb() as functions.  They are normally only available as
- * inline functions, thus cannot be called from the debugger.
- */
-
-/* silence compiler warnings */
-u_char inb_(u_short);
-void outb_(u_short, u_char);
-
-u_char
-inb_(u_short port)
-{
-	return inb(port);
-}
-
-void
-outb_(u_short port, u_char data)
-{
-	outb(port, data);
-}
-
-#endif /* KDB */