diff options
author | grehan <grehan@FreeBSD.org> | 2005-11-09 10:28:51 +0000 |
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committer | grehan <grehan@FreeBSD.org> | 2005-11-09 10:28:51 +0000 |
commit | d172c34eff421b891e451456d0a555e7bba3d61f (patch) | |
tree | 5494e01f6d34486f857f2f69c22d4657d8d794f3 /sys | |
parent | 11e7032f178eb9f4792d4600b6471fe280d1a42b (diff) | |
download | FreeBSD-src-d172c34eff421b891e451456d0a555e7bba3d61f.zip FreeBSD-src-d172c34eff421b891e451456d0a555e7bba3d61f.tar.gz |
No longer needed: replaced by mmu_if.m/pmap_dispatch.c/mmu_oea.c
Diffstat (limited to 'sys')
-rw-r--r-- | sys/powerpc/powerpc/pmap.c | 2476 |
1 files changed, 0 insertions, 2476 deletions
diff --git a/sys/powerpc/powerpc/pmap.c b/sys/powerpc/powerpc/pmap.c deleted file mode 100644 index 91b645a..0000000 --- a/sys/powerpc/powerpc/pmap.c +++ /dev/null @@ -1,2476 +0,0 @@ -/*- - * Copyright (c) 2001 The NetBSD Foundation, Inc. - * All rights reserved. - * - * This code is derived from software contributed to The NetBSD Foundation - * by Matt Thomas <matt@3am-software.com> of Allegro Networks, Inc. - * - * 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 NetBSD - * Foundation, Inc. and its contributors. - * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. - */ -/*- - * Copyright (C) 1995, 1996 Wolfgang Solfrank. - * Copyright (C) 1995, 1996 TooLs GmbH. - * All rights reserved. - * - * 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 TooLs GmbH. - * 4. The name of TooLs GmbH may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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. - * - * $NetBSD: pmap.c,v 1.28 2000/03/26 20:42:36 kleink Exp $ - */ -/*- - * Copyright (C) 2001 Benno Rice. - * All rights reserved. - * - * 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. - * - * THIS SOFTWARE IS PROVIDED BY Benno Rice ``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 TOOLS GMBH 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. - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -/* - * Manages physical address maps. - * - * In addition to hardware address maps, this module is called upon to - * provide software-use-only maps which may or may not be stored in the - * same form as hardware maps. These pseudo-maps are used to store - * intermediate results from copy operations to and from address spaces. - * - * Since the information managed by this module is also stored by the - * logical address mapping module, this module may throw away valid virtual - * to physical mappings at almost any time. However, invalidations of - * mappings must be done as requested. - * - * In order to cope with hardware architectures which make virtual to - * physical map invalidates expensive, this module may delay invalidate - * reduced protection operations until such time as they are actually - * necessary. This module is given full information as to which processors - * are currently using which maps, and to when physical maps must be made - * correct. - */ - -#include "opt_kstack_pages.h" - -#include <sys/param.h> -#include <sys/kernel.h> -#include <sys/ktr.h> -#include <sys/lock.h> -#include <sys/msgbuf.h> -#include <sys/mutex.h> -#include <sys/proc.h> -#include <sys/sysctl.h> -#include <sys/systm.h> -#include <sys/vmmeter.h> - -#include <dev/ofw/openfirm.h> - -#include <vm/vm.h> -#include <vm/vm_param.h> -#include <vm/vm_kern.h> -#include <vm/vm_page.h> -#include <vm/vm_map.h> -#include <vm/vm_object.h> -#include <vm/vm_extern.h> -#include <vm/vm_pageout.h> -#include <vm/vm_pager.h> -#include <vm/uma.h> - -#include <machine/cpu.h> -#include <machine/powerpc.h> -#include <machine/bat.h> -#include <machine/frame.h> -#include <machine/md_var.h> -#include <machine/psl.h> -#include <machine/pte.h> -#include <machine/sr.h> - -#define PMAP_DEBUG - -#define TODO panic("%s: not implemented", __func__); - -#define TLBIE(va) __asm __volatile("tlbie %0" :: "r"(va)) -#define TLBSYNC() __asm __volatile("tlbsync"); -#define SYNC() __asm __volatile("sync"); -#define EIEIO() __asm __volatile("eieio"); - -#define VSID_MAKE(sr, hash) ((sr) | (((hash) & 0xfffff) << 4)) -#define VSID_TO_SR(vsid) ((vsid) & 0xf) -#define VSID_TO_HASH(vsid) (((vsid) >> 4) & 0xfffff) - -#define PVO_PTEGIDX_MASK 0x007 /* which PTEG slot */ -#define PVO_PTEGIDX_VALID 0x008 /* slot is valid */ -#define PVO_WIRED 0x010 /* PVO entry is wired */ -#define PVO_MANAGED 0x020 /* PVO entry is managed */ -#define PVO_EXECUTABLE 0x040 /* PVO entry is executable */ -#define PVO_BOOTSTRAP 0x080 /* PVO entry allocated during - bootstrap */ -#define PVO_FAKE 0x100 /* fictitious phys page */ -#define PVO_VADDR(pvo) ((pvo)->pvo_vaddr & ~ADDR_POFF) -#define PVO_ISEXECUTABLE(pvo) ((pvo)->pvo_vaddr & PVO_EXECUTABLE) -#define PVO_ISFAKE(pvo) ((pvo)->pvo_vaddr & PVO_FAKE) -#define PVO_PTEGIDX_GET(pvo) ((pvo)->pvo_vaddr & PVO_PTEGIDX_MASK) -#define PVO_PTEGIDX_ISSET(pvo) ((pvo)->pvo_vaddr & PVO_PTEGIDX_VALID) -#define PVO_PTEGIDX_CLR(pvo) \ - ((void)((pvo)->pvo_vaddr &= ~(PVO_PTEGIDX_VALID|PVO_PTEGIDX_MASK))) -#define PVO_PTEGIDX_SET(pvo, i) \ - ((void)((pvo)->pvo_vaddr |= (i)|PVO_PTEGIDX_VALID)) - -#define PMAP_PVO_CHECK(pvo) - -struct ofw_map { - vm_offset_t om_va; - vm_size_t om_len; - vm_offset_t om_pa; - u_int om_mode; -}; - -int pmap_bootstrapped = 0; - -/* - * Virtual and physical address of message buffer. - */ -struct msgbuf *msgbufp; -vm_offset_t msgbuf_phys; - -/* - * Map of physical memory regions. - */ -vm_offset_t phys_avail[128]; -u_int phys_avail_count; -static struct mem_region *regions; -static struct mem_region *pregions; -int regions_sz, pregions_sz; -static struct ofw_map *translations; - -/* - * First and last available kernel virtual addresses. - */ -vm_offset_t virtual_avail; -vm_offset_t virtual_end; -vm_offset_t kernel_vm_end; - -/* - * Kernel pmap. - */ -struct pmap kernel_pmap_store; -extern struct pmap ofw_pmap; - -/* - * Lock for the pteg and pvo tables. - */ -struct mtx pmap_table_mutex; - -/* - * PTEG data. - */ -static struct pteg *pmap_pteg_table; -u_int pmap_pteg_count; -u_int pmap_pteg_mask; - -/* - * PVO data. - */ -struct pvo_head *pmap_pvo_table; /* pvo entries by pteg index */ -struct pvo_head pmap_pvo_kunmanaged = - LIST_HEAD_INITIALIZER(pmap_pvo_kunmanaged); /* list of unmanaged pages */ -struct pvo_head pmap_pvo_unmanaged = - LIST_HEAD_INITIALIZER(pmap_pvo_unmanaged); /* list of unmanaged pages */ - -uma_zone_t pmap_upvo_zone; /* zone for pvo entries for unmanaged pages */ -uma_zone_t pmap_mpvo_zone; /* zone for pvo entries for managed pages */ - -#define BPVO_POOL_SIZE 32768 -static struct pvo_entry *pmap_bpvo_pool; -static int pmap_bpvo_pool_index = 0; - -#define VSID_NBPW (sizeof(u_int32_t) * 8) -static u_int pmap_vsid_bitmap[NPMAPS / VSID_NBPW]; - -static boolean_t pmap_initialized = FALSE; - -/* - * Statistics. - */ -u_int pmap_pte_valid = 0; -u_int pmap_pte_overflow = 0; -u_int pmap_pte_replacements = 0; -u_int pmap_pvo_entries = 0; -u_int pmap_pvo_enter_calls = 0; -u_int pmap_pvo_remove_calls = 0; -u_int pmap_pte_spills = 0; -SYSCTL_INT(_machdep, OID_AUTO, pmap_pte_valid, CTLFLAG_RD, &pmap_pte_valid, - 0, ""); -SYSCTL_INT(_machdep, OID_AUTO, pmap_pte_overflow, CTLFLAG_RD, - &pmap_pte_overflow, 0, ""); -SYSCTL_INT(_machdep, OID_AUTO, pmap_pte_replacements, CTLFLAG_RD, - &pmap_pte_replacements, 0, ""); -SYSCTL_INT(_machdep, OID_AUTO, pmap_pvo_entries, CTLFLAG_RD, &pmap_pvo_entries, - 0, ""); -SYSCTL_INT(_machdep, OID_AUTO, pmap_pvo_enter_calls, CTLFLAG_RD, - &pmap_pvo_enter_calls, 0, ""); -SYSCTL_INT(_machdep, OID_AUTO, pmap_pvo_remove_calls, CTLFLAG_RD, - &pmap_pvo_remove_calls, 0, ""); -SYSCTL_INT(_machdep, OID_AUTO, pmap_pte_spills, CTLFLAG_RD, - &pmap_pte_spills, 0, ""); - -struct pvo_entry *pmap_pvo_zeropage; - -vm_offset_t pmap_rkva_start = VM_MIN_KERNEL_ADDRESS; -u_int pmap_rkva_count = 4; - -/* - * Allocate physical memory for use in pmap_bootstrap. - */ -static vm_offset_t pmap_bootstrap_alloc(vm_size_t, u_int); - -/* - * PTE calls. - */ -static int pmap_pte_insert(u_int, struct pte *); - -/* - * PVO calls. - */ -static int pmap_pvo_enter(pmap_t, uma_zone_t, struct pvo_head *, - vm_offset_t, vm_offset_t, u_int, int); -static void pmap_pvo_remove(struct pvo_entry *, int); -static struct pvo_entry *pmap_pvo_find_va(pmap_t, vm_offset_t, int *); -static struct pte *pmap_pvo_to_pte(const struct pvo_entry *, int); - -/* - * Utility routines. - */ -static struct pvo_entry *pmap_rkva_alloc(void); -static void pmap_pa_map(struct pvo_entry *, vm_offset_t, - struct pte *, int *); -static void pmap_pa_unmap(struct pvo_entry *, struct pte *, int *); -static void pmap_syncicache(vm_offset_t, vm_size_t); -static boolean_t pmap_query_bit(vm_page_t, int); -static u_int pmap_clear_bit(vm_page_t, int, int *); -static void tlbia(void); - -static __inline int -va_to_sr(u_int *sr, vm_offset_t va) -{ - return (sr[(uintptr_t)va >> ADDR_SR_SHFT]); -} - -static __inline u_int -va_to_pteg(u_int sr, vm_offset_t addr) -{ - u_int hash; - - hash = (sr & SR_VSID_MASK) ^ (((u_int)addr & ADDR_PIDX) >> - ADDR_PIDX_SHFT); - return (hash & pmap_pteg_mask); -} - -static __inline struct pvo_head * -pa_to_pvoh(vm_offset_t pa, vm_page_t *pg_p) -{ - struct vm_page *pg; - - pg = PHYS_TO_VM_PAGE(pa); - - if (pg_p != NULL) - *pg_p = pg; - - if (pg == NULL) - return (&pmap_pvo_unmanaged); - - return (&pg->md.mdpg_pvoh); -} - -static __inline struct pvo_head * -vm_page_to_pvoh(vm_page_t m) -{ - - return (&m->md.mdpg_pvoh); -} - -static __inline void -pmap_attr_clear(vm_page_t m, int ptebit) -{ - - m->md.mdpg_attrs &= ~ptebit; -} - -static __inline int -pmap_attr_fetch(vm_page_t m) -{ - - return (m->md.mdpg_attrs); -} - -static __inline void -pmap_attr_save(vm_page_t m, int ptebit) -{ - - m->md.mdpg_attrs |= ptebit; -} - -static __inline int -pmap_pte_compare(const struct pte *pt, const struct pte *pvo_pt) -{ - if (pt->pte_hi == pvo_pt->pte_hi) - return (1); - - return (0); -} - -static __inline int -pmap_pte_match(struct pte *pt, u_int sr, vm_offset_t va, int which) -{ - return (pt->pte_hi & ~PTE_VALID) == - (((sr & SR_VSID_MASK) << PTE_VSID_SHFT) | - ((va >> ADDR_API_SHFT) & PTE_API) | which); -} - -static __inline void -pmap_pte_create(struct pte *pt, u_int sr, vm_offset_t va, u_int pte_lo) -{ - /* - * Construct a PTE. Default to IMB initially. Valid bit only gets - * set when the real pte is set in memory. - * - * Note: Don't set the valid bit for correct operation of tlb update. - */ - pt->pte_hi = ((sr & SR_VSID_MASK) << PTE_VSID_SHFT) | - (((va & ADDR_PIDX) >> ADDR_API_SHFT) & PTE_API); - pt->pte_lo = pte_lo; -} - -static __inline void -pmap_pte_synch(struct pte *pt, struct pte *pvo_pt) -{ - - pvo_pt->pte_lo |= pt->pte_lo & (PTE_REF | PTE_CHG); -} - -static __inline void -pmap_pte_clear(struct pte *pt, vm_offset_t va, int ptebit) -{ - - /* - * As shown in Section 7.6.3.2.3 - */ - pt->pte_lo &= ~ptebit; - TLBIE(va); - EIEIO(); - TLBSYNC(); - SYNC(); -} - -static __inline void -pmap_pte_set(struct pte *pt, struct pte *pvo_pt) -{ - - pvo_pt->pte_hi |= PTE_VALID; - - /* - * Update the PTE as defined in section 7.6.3.1. - * Note that the REF/CHG bits are from pvo_pt and thus should havce - * been saved so this routine can restore them (if desired). - */ - pt->pte_lo = pvo_pt->pte_lo; - EIEIO(); - pt->pte_hi = pvo_pt->pte_hi; - SYNC(); - pmap_pte_valid++; -} - -static __inline void -pmap_pte_unset(struct pte *pt, struct pte *pvo_pt, vm_offset_t va) -{ - - pvo_pt->pte_hi &= ~PTE_VALID; - - /* - * Force the reg & chg bits back into the PTEs. - */ - SYNC(); - - /* - * Invalidate the pte. - */ - pt->pte_hi &= ~PTE_VALID; - - SYNC(); - TLBIE(va); - EIEIO(); - TLBSYNC(); - SYNC(); - - /* - * Save the reg & chg bits. - */ - pmap_pte_synch(pt, pvo_pt); - pmap_pte_valid--; -} - -static __inline void -pmap_pte_change(struct pte *pt, struct pte *pvo_pt, vm_offset_t va) -{ - - /* - * Invalidate the PTE - */ - pmap_pte_unset(pt, pvo_pt, va); - pmap_pte_set(pt, pvo_pt); -} - -/* - * Quick sort callout for comparing memory regions. - */ -static int mr_cmp(const void *a, const void *b); -static int om_cmp(const void *a, const void *b); - -static int -mr_cmp(const void *a, const void *b) -{ - const struct mem_region *regiona; - const struct mem_region *regionb; - - regiona = a; - regionb = b; - if (regiona->mr_start < regionb->mr_start) - return (-1); - else if (regiona->mr_start > regionb->mr_start) - return (1); - else - return (0); -} - -static int -om_cmp(const void *a, const void *b) -{ - const struct ofw_map *mapa; - const struct ofw_map *mapb; - - mapa = a; - mapb = b; - if (mapa->om_pa < mapb->om_pa) - return (-1); - else if (mapa->om_pa > mapb->om_pa) - return (1); - else - return (0); -} - -void -pmap_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend) -{ - ihandle_t mmui; - phandle_t chosen, mmu; - int sz; - int i, j; - int ofw_mappings; - vm_size_t size, physsz, hwphyssz; - vm_offset_t pa, va, off; - u_int batl, batu; - - /* - * Set up BAT0 to map the lowest 256 MB area - */ - battable[0x0].batl = BATL(0x00000000, BAT_M, BAT_PP_RW); - battable[0x0].batu = BATU(0x00000000, BAT_BL_256M, BAT_Vs); - - /* - * Map PCI memory space. - */ - battable[0x8].batl = BATL(0x80000000, BAT_I|BAT_G, BAT_PP_RW); - battable[0x8].batu = BATU(0x80000000, BAT_BL_256M, BAT_Vs); - - battable[0x9].batl = BATL(0x90000000, BAT_I|BAT_G, BAT_PP_RW); - battable[0x9].batu = BATU(0x90000000, BAT_BL_256M, BAT_Vs); - - battable[0xa].batl = BATL(0xa0000000, BAT_I|BAT_G, BAT_PP_RW); - battable[0xa].batu = BATU(0xa0000000, BAT_BL_256M, BAT_Vs); - - battable[0xb].batl = BATL(0xb0000000, BAT_I|BAT_G, BAT_PP_RW); - battable[0xb].batu = BATU(0xb0000000, BAT_BL_256M, BAT_Vs); - - /* - * Map obio devices. - */ - battable[0xf].batl = BATL(0xf0000000, BAT_I|BAT_G, BAT_PP_RW); - battable[0xf].batu = BATU(0xf0000000, BAT_BL_256M, BAT_Vs); - - /* - * Use an IBAT and a DBAT to map the bottom segment of memory - * where we are. - */ - batu = BATU(0x00000000, BAT_BL_256M, BAT_Vs); - batl = BATL(0x00000000, BAT_M, BAT_PP_RW); - __asm (".balign 32; \n" - "mtibatu 0,%0; mtibatl 0,%1; isync; \n" - "mtdbatu 0,%0; mtdbatl 0,%1; isync" - :: "r"(batu), "r"(batl)); - -#if 0 - /* map frame buffer */ - batu = BATU(0x90000000, BAT_BL_256M, BAT_Vs); - batl = BATL(0x90000000, BAT_I|BAT_G, BAT_PP_RW); - __asm ("mtdbatu 1,%0; mtdbatl 1,%1; isync" - :: "r"(batu), "r"(batl)); -#endif - -#if 1 - /* map pci space */ - batu = BATU(0x80000000, BAT_BL_256M, BAT_Vs); - batl = BATL(0x80000000, BAT_I|BAT_G, BAT_PP_RW); - __asm ("mtdbatu 1,%0; mtdbatl 1,%1; isync" - :: "r"(batu), "r"(batl)); -#endif - - /* - * Set the start and end of kva. - */ - virtual_avail = VM_MIN_KERNEL_ADDRESS; - virtual_end = VM_MAX_KERNEL_ADDRESS; - - mem_regions(&pregions, &pregions_sz, ®ions, ®ions_sz); - CTR0(KTR_PMAP, "pmap_bootstrap: physical memory"); - - qsort(pregions, pregions_sz, sizeof(*pregions), mr_cmp); - for (i = 0; i < pregions_sz; i++) { - vm_offset_t pa; - vm_offset_t end; - - CTR3(KTR_PMAP, "physregion: %#x - %#x (%#x)", - pregions[i].mr_start, - pregions[i].mr_start + pregions[i].mr_size, - pregions[i].mr_size); - /* - * Install entries into the BAT table to allow all - * of physmem to be convered by on-demand BAT entries. - * The loop will sometimes set the same battable element - * twice, but that's fine since they won't be used for - * a while yet. - */ - pa = pregions[i].mr_start & 0xf0000000; - end = pregions[i].mr_start + pregions[i].mr_size; - do { - u_int n = pa >> ADDR_SR_SHFT; - - battable[n].batl = BATL(pa, BAT_M, BAT_PP_RW); - battable[n].batu = BATU(pa, BAT_BL_256M, BAT_Vs); - pa += SEGMENT_LENGTH; - } while (pa < end); - } - - if (sizeof(phys_avail)/sizeof(phys_avail[0]) < regions_sz) - panic("pmap_bootstrap: phys_avail too small"); - qsort(regions, regions_sz, sizeof(*regions), mr_cmp); - phys_avail_count = 0; - physsz = 0; - hwphyssz = 0; - TUNABLE_ULONG_FETCH("hw.physmem", (u_long *) &hwphyssz); - for (i = 0, j = 0; i < regions_sz; i++, j += 2) { - CTR3(KTR_PMAP, "region: %#x - %#x (%#x)", regions[i].mr_start, - regions[i].mr_start + regions[i].mr_size, - regions[i].mr_size); - if (hwphyssz != 0 && - (physsz + regions[i].mr_size) >= hwphyssz) { - if (physsz < hwphyssz) { - phys_avail[j] = regions[i].mr_start; - phys_avail[j + 1] = regions[i].mr_start + - hwphyssz - physsz; - physsz = hwphyssz; - phys_avail_count++; - } - break; - } - phys_avail[j] = regions[i].mr_start; - phys_avail[j + 1] = regions[i].mr_start + regions[i].mr_size; - phys_avail_count++; - physsz += regions[i].mr_size; - } - physmem = btoc(physsz); - - /* - * Allocate PTEG table. - */ -#ifdef PTEGCOUNT - pmap_pteg_count = PTEGCOUNT; -#else - pmap_pteg_count = 0x1000; - - while (pmap_pteg_count < physmem) - pmap_pteg_count <<= 1; - - pmap_pteg_count >>= 1; -#endif /* PTEGCOUNT */ - - size = pmap_pteg_count * sizeof(struct pteg); - CTR2(KTR_PMAP, "pmap_bootstrap: %d PTEGs, %d bytes", pmap_pteg_count, - size); - pmap_pteg_table = (struct pteg *)pmap_bootstrap_alloc(size, size); - CTR1(KTR_PMAP, "pmap_bootstrap: PTEG table at %p", pmap_pteg_table); - bzero((void *)pmap_pteg_table, pmap_pteg_count * sizeof(struct pteg)); - pmap_pteg_mask = pmap_pteg_count - 1; - - /* - * Allocate pv/overflow lists. - */ - size = sizeof(struct pvo_head) * pmap_pteg_count; - pmap_pvo_table = (struct pvo_head *)pmap_bootstrap_alloc(size, - PAGE_SIZE); - CTR1(KTR_PMAP, "pmap_bootstrap: PVO table at %p", pmap_pvo_table); - for (i = 0; i < pmap_pteg_count; i++) - LIST_INIT(&pmap_pvo_table[i]); - - /* - * Initialize the lock that synchronizes access to the pteg and pvo - * tables. - */ - mtx_init(&pmap_table_mutex, "pmap table", NULL, MTX_DEF); - - /* - * Allocate the message buffer. - */ - msgbuf_phys = pmap_bootstrap_alloc(MSGBUF_SIZE, 0); - - /* - * Initialise the unmanaged pvo pool. - */ - pmap_bpvo_pool = (struct pvo_entry *)pmap_bootstrap_alloc( - BPVO_POOL_SIZE*sizeof(struct pvo_entry), 0); - pmap_bpvo_pool_index = 0; - - /* - * Make sure kernel vsid is allocated as well as VSID 0. - */ - pmap_vsid_bitmap[(KERNEL_VSIDBITS & (NPMAPS - 1)) / VSID_NBPW] - |= 1 << (KERNEL_VSIDBITS % VSID_NBPW); - pmap_vsid_bitmap[0] |= 1; - - /* - * Set up the Open Firmware pmap and add it's mappings. - */ - pmap_pinit(&ofw_pmap); - ofw_pmap.pm_sr[KERNEL_SR] = KERNEL_SEGMENT; - ofw_pmap.pm_sr[KERNEL2_SR] = KERNEL2_SEGMENT; - if ((chosen = OF_finddevice("/chosen")) == -1) - panic("pmap_bootstrap: can't find /chosen"); - OF_getprop(chosen, "mmu", &mmui, 4); - if ((mmu = OF_instance_to_package(mmui)) == -1) - panic("pmap_bootstrap: can't get mmu package"); - if ((sz = OF_getproplen(mmu, "translations")) == -1) - panic("pmap_bootstrap: can't get ofw translation count"); - translations = NULL; - for (i = 0; phys_avail[i] != 0; i += 2) { - if (phys_avail[i + 1] >= sz) { - translations = (struct ofw_map *)phys_avail[i]; - break; - } - } - if (translations == NULL) - panic("pmap_bootstrap: no space to copy translations"); - bzero(translations, sz); - if (OF_getprop(mmu, "translations", translations, sz) == -1) - panic("pmap_bootstrap: can't get ofw translations"); - CTR0(KTR_PMAP, "pmap_bootstrap: translations"); - sz /= sizeof(*translations); - qsort(translations, sz, sizeof (*translations), om_cmp); - for (i = 0, ofw_mappings = 0; i < sz; i++) { - CTR3(KTR_PMAP, "translation: pa=%#x va=%#x len=%#x", - translations[i].om_pa, translations[i].om_va, - translations[i].om_len); - - /* - * If the mapping is 1:1, let the RAM and device on-demand - * BAT tables take care of the translation. - */ - if (translations[i].om_va == translations[i].om_pa) - continue; - - /* Enter the pages */ - for (off = 0; off < translations[i].om_len; off += PAGE_SIZE) { - struct vm_page m; - - m.phys_addr = translations[i].om_pa + off; - pmap_enter(&ofw_pmap, translations[i].om_va + off, &m, - VM_PROT_ALL, 1); - ofw_mappings++; - } - } -#ifdef SMP - TLBSYNC(); -#endif - - /* - * Initialize the kernel pmap (which is statically allocated). - */ - PMAP_LOCK_INIT(kernel_pmap); - for (i = 0; i < 16; i++) { - kernel_pmap->pm_sr[i] = EMPTY_SEGMENT; - } - kernel_pmap->pm_sr[KERNEL_SR] = KERNEL_SEGMENT; - kernel_pmap->pm_sr[KERNEL2_SR] = KERNEL2_SEGMENT; - kernel_pmap->pm_active = ~0; - - /* - * Allocate a kernel stack with a guard page for thread0 and map it - * into the kernel page map. - */ - pa = pmap_bootstrap_alloc(KSTACK_PAGES * PAGE_SIZE, 0); - kstack0_phys = pa; - kstack0 = virtual_avail + (KSTACK_GUARD_PAGES * PAGE_SIZE); - CTR2(KTR_PMAP, "pmap_bootstrap: kstack0 at %#x (%#x)", kstack0_phys, - kstack0); - virtual_avail += (KSTACK_PAGES + KSTACK_GUARD_PAGES) * PAGE_SIZE; - for (i = 0; i < KSTACK_PAGES; i++) { - pa = kstack0_phys + i * PAGE_SIZE; - va = kstack0 + i * PAGE_SIZE; - pmap_kenter(va, pa); - TLBIE(va); - } - - /* - * Calculate the last available physical address. - */ - for (i = 0; phys_avail[i + 2] != 0; i += 2) - ; - Maxmem = powerpc_btop(phys_avail[i + 1]); - - /* - * Allocate virtual address space for the message buffer. - */ - msgbufp = (struct msgbuf *)virtual_avail; - virtual_avail += round_page(MSGBUF_SIZE); - - /* - * Initialize hardware. - */ - for (i = 0; i < 16; i++) { - mtsrin(i << ADDR_SR_SHFT, EMPTY_SEGMENT); - } - __asm __volatile ("mtsr %0,%1" - :: "n"(KERNEL_SR), "r"(KERNEL_SEGMENT)); - __asm __volatile ("mtsr %0,%1" - :: "n"(KERNEL2_SR), "r"(KERNEL2_SEGMENT)); - __asm __volatile ("sync; mtsdr1 %0; isync" - :: "r"((u_int)pmap_pteg_table | (pmap_pteg_mask >> 10))); - tlbia(); - - pmap_bootstrapped++; -} - -/* - * Activate a user pmap. The pmap must be activated before it's address - * space can be accessed in any way. - */ -void -pmap_activate(struct thread *td) -{ - pmap_t pm, pmr; - - /* - * Load all the data we need up front to encourage the compiler to - * not issue any loads while we have interrupts disabled below. - */ - pm = &td->td_proc->p_vmspace->vm_pmap; - - if ((pmr = (pmap_t)pmap_kextract((vm_offset_t)pm)) == NULL) - pmr = pm; - - pm->pm_active |= PCPU_GET(cpumask); - PCPU_SET(curpmap, pmr); -} - -void -pmap_deactivate(struct thread *td) -{ - pmap_t pm; - - pm = &td->td_proc->p_vmspace->vm_pmap; - pm->pm_active &= ~(PCPU_GET(cpumask)); - PCPU_SET(curpmap, NULL); -} - -vm_offset_t -pmap_addr_hint(vm_object_t object, vm_offset_t va, vm_size_t size) -{ - - return (va); -} - -void -pmap_change_wiring(pmap_t pm, vm_offset_t va, boolean_t wired) -{ - struct pvo_entry *pvo; - - PMAP_LOCK(pm); - pvo = pmap_pvo_find_va(pm, va & ~ADDR_POFF, NULL); - - if (pvo != NULL) { - if (wired) { - if ((pvo->pvo_vaddr & PVO_WIRED) == 0) - pm->pm_stats.wired_count++; - pvo->pvo_vaddr |= PVO_WIRED; - } else { - if ((pvo->pvo_vaddr & PVO_WIRED) != 0) - pm->pm_stats.wired_count--; - pvo->pvo_vaddr &= ~PVO_WIRED; - } - } - PMAP_UNLOCK(pm); -} - -void -pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, - vm_size_t len, vm_offset_t src_addr) -{ - - /* - * This is not needed as it's mainly an optimisation. - * It may want to be implemented later though. - */ -} - -void -pmap_copy_page(vm_page_t msrc, vm_page_t mdst) -{ - vm_offset_t dst; - vm_offset_t src; - - dst = VM_PAGE_TO_PHYS(mdst); - src = VM_PAGE_TO_PHYS(msrc); - - kcopy((void *)src, (void *)dst, PAGE_SIZE); -} - -/* - * Zero a page of physical memory by temporarily mapping it into the tlb. - */ -void -pmap_zero_page(vm_page_t m) -{ - vm_offset_t pa = VM_PAGE_TO_PHYS(m); - caddr_t va; - - if (pa < SEGMENT_LENGTH) { - va = (caddr_t) pa; - } else if (pmap_initialized) { - if (pmap_pvo_zeropage == NULL) - pmap_pvo_zeropage = pmap_rkva_alloc(); - pmap_pa_map(pmap_pvo_zeropage, pa, NULL, NULL); - va = (caddr_t)PVO_VADDR(pmap_pvo_zeropage); - } else { - panic("pmap_zero_page: can't zero pa %#x", pa); - } - - bzero(va, PAGE_SIZE); - - if (pa >= SEGMENT_LENGTH) - pmap_pa_unmap(pmap_pvo_zeropage, NULL, NULL); -} - -void -pmap_zero_page_area(vm_page_t m, int off, int size) -{ - vm_offset_t pa = VM_PAGE_TO_PHYS(m); - caddr_t va; - - if (pa < SEGMENT_LENGTH) { - va = (caddr_t) pa; - } else if (pmap_initialized) { - if (pmap_pvo_zeropage == NULL) - pmap_pvo_zeropage = pmap_rkva_alloc(); - pmap_pa_map(pmap_pvo_zeropage, pa, NULL, NULL); - va = (caddr_t)PVO_VADDR(pmap_pvo_zeropage); - } else { - panic("pmap_zero_page: can't zero pa %#x", pa); - } - - bzero(va + off, size); - - if (pa >= SEGMENT_LENGTH) - pmap_pa_unmap(pmap_pvo_zeropage, NULL, NULL); -} - -void -pmap_zero_page_idle(vm_page_t m) -{ - - /* XXX this is called outside of Giant, is pmap_zero_page safe? */ - /* XXX maybe have a dedicated mapping for this to avoid the problem? */ - mtx_lock(&Giant); - pmap_zero_page(m); - mtx_unlock(&Giant); -} - -/* - * Map the given physical page at the specified virtual address in the - * target pmap with the protection requested. If specified the page - * will be wired down. - */ -void -pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot, - boolean_t wired) -{ - struct pvo_head *pvo_head; - uma_zone_t zone; - vm_page_t pg; - u_int pte_lo, pvo_flags, was_exec, i; - int error; - - if (!pmap_initialized) { - pvo_head = &pmap_pvo_kunmanaged; - zone = pmap_upvo_zone; - pvo_flags = 0; - pg = NULL; - was_exec = PTE_EXEC; - } else { - pvo_head = vm_page_to_pvoh(m); - pg = m; - zone = pmap_mpvo_zone; - pvo_flags = PVO_MANAGED; - was_exec = 0; - } - if (pmap_bootstrapped) - vm_page_lock_queues(); - PMAP_LOCK(pmap); - - /* XXX change the pvo head for fake pages */ - if ((m->flags & PG_FICTITIOUS) == PG_FICTITIOUS) - pvo_head = &pmap_pvo_kunmanaged; - - /* - * If this is a managed page, and it's the first reference to the page, - * clear the execness of the page. Otherwise fetch the execness. - */ - if ((pg != NULL) && ((m->flags & PG_FICTITIOUS) == 0)) { - if (LIST_EMPTY(pvo_head)) { - pmap_attr_clear(pg, PTE_EXEC); - } else { - was_exec = pmap_attr_fetch(pg) & PTE_EXEC; - } - } - - /* - * Assume the page is cache inhibited and access is guarded unless - * it's in our available memory array. - */ - pte_lo = PTE_I | PTE_G; - for (i = 0; i < pregions_sz; i++) { - if ((VM_PAGE_TO_PHYS(m) >= pregions[i].mr_start) && - (VM_PAGE_TO_PHYS(m) < - (pregions[i].mr_start + pregions[i].mr_size))) { - pte_lo &= ~(PTE_I | PTE_G); - break; - } - } - - if (prot & VM_PROT_WRITE) - pte_lo |= PTE_BW; - else - pte_lo |= PTE_BR; - - if (prot & VM_PROT_EXECUTE) - pvo_flags |= PVO_EXECUTABLE; - - if (wired) - pvo_flags |= PVO_WIRED; - - if ((m->flags & PG_FICTITIOUS) != 0) - pvo_flags |= PVO_FAKE; - - error = pmap_pvo_enter(pmap, zone, pvo_head, va, VM_PAGE_TO_PHYS(m), - pte_lo, pvo_flags); - - /* - * Flush the real page from the instruction cache if this page is - * mapped executable and cacheable and was not previously mapped (or - * was not mapped executable). - */ - if (error == 0 && (pvo_flags & PVO_EXECUTABLE) && - (pte_lo & PTE_I) == 0 && was_exec == 0) { - /* - * Flush the real memory from the cache. - */ - pmap_syncicache(VM_PAGE_TO_PHYS(m), PAGE_SIZE); - if (pg != NULL) - pmap_attr_save(pg, PTE_EXEC); - } - if (pmap_bootstrapped) - vm_page_unlock_queues(); - - /* XXX syncicache always until problems are sorted */ - pmap_syncicache(VM_PAGE_TO_PHYS(m), PAGE_SIZE); - PMAP_UNLOCK(pmap); -} - -vm_page_t -pmap_enter_quick(pmap_t pm, vm_offset_t va, vm_page_t m, vm_prot_t prot, - vm_page_t mpte) -{ - - vm_page_busy(m); - vm_page_unlock_queues(); - VM_OBJECT_UNLOCK(m->object); - mtx_lock(&Giant); - pmap_enter(pm, va, m, prot & (VM_PROT_READ | VM_PROT_EXECUTE), FALSE); - mtx_unlock(&Giant); - VM_OBJECT_LOCK(m->object); - vm_page_lock_queues(); - vm_page_wakeup(m); - return (NULL); -} - -vm_paddr_t -pmap_extract(pmap_t pm, vm_offset_t va) -{ - struct pvo_entry *pvo; - vm_paddr_t pa; - - PMAP_LOCK(pm); - pvo = pmap_pvo_find_va(pm, va & ~ADDR_POFF, NULL); - if (pvo == NULL) - pa = 0; - else - pa = (pvo->pvo_pte.pte_lo & PTE_RPGN) | (va & ADDR_POFF); - PMAP_UNLOCK(pm); - return (pa); -} - -/* - * Atomically extract and hold the physical page with the given - * pmap and virtual address pair if that mapping permits the given - * protection. - */ -vm_page_t -pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) -{ - struct pvo_entry *pvo; - vm_page_t m; - - m = NULL; - mtx_lock(&Giant); - vm_page_lock_queues(); - PMAP_LOCK(pmap); - pvo = pmap_pvo_find_va(pmap, va & ~ADDR_POFF, NULL); - if (pvo != NULL && (pvo->pvo_pte.pte_hi & PTE_VALID) && - ((pvo->pvo_pte.pte_lo & PTE_PP) == PTE_RW || - (prot & VM_PROT_WRITE) == 0)) { - m = PHYS_TO_VM_PAGE(pvo->pvo_pte.pte_lo & PTE_RPGN); - vm_page_hold(m); - } - vm_page_unlock_queues(); - PMAP_UNLOCK(pmap); - mtx_unlock(&Giant); - return (m); -} - -/* - * Grow the number of kernel page table entries. Unneeded. - */ -void -pmap_growkernel(vm_offset_t addr) -{ -} - -/* - * Initialize a vm_page's machine-dependent fields. - */ -void -pmap_page_init(vm_page_t m) -{ -} - -void -pmap_init(void) -{ - - CTR0(KTR_PMAP, "pmap_init"); - - pmap_upvo_zone = uma_zcreate("UPVO entry", sizeof (struct pvo_entry), - NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, - UMA_ZONE_VM | UMA_ZONE_NOFREE); - pmap_mpvo_zone = uma_zcreate("MPVO entry", sizeof(struct pvo_entry), - NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, - UMA_ZONE_VM | UMA_ZONE_NOFREE); - pmap_initialized = TRUE; -} - -void -pmap_init2(void) -{ - - CTR0(KTR_PMAP, "pmap_init2"); -} - -boolean_t -pmap_is_modified(vm_page_t m) -{ - - if ((m->flags & (PG_FICTITIOUS |PG_UNMANAGED)) != 0) - return (FALSE); - - return (pmap_query_bit(m, PTE_CHG)); -} - -/* - * pmap_is_prefaultable: - * - * Return whether or not the specified virtual address is elgible - * for prefault. - */ -boolean_t -pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr) -{ - - return (FALSE); -} - -void -pmap_clear_reference(vm_page_t m) -{ - - if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0) - return; - pmap_clear_bit(m, PTE_REF, NULL); -} - -void -pmap_clear_modify(vm_page_t m) -{ - - if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0) - return; - pmap_clear_bit(m, PTE_CHG, NULL); -} - -/* - * pmap_ts_referenced: - * - * Return a count of reference bits for a page, clearing those bits. - * It is not necessary for every reference bit to be cleared, but it - * is necessary that 0 only be returned when there are truly no - * reference bits set. - * - * XXX: The exact number of bits to check and clear is a matter that - * should be tested and standardized at some point in the future for - * optimal aging of shared pages. - */ -int -pmap_ts_referenced(vm_page_t m) -{ - int count; - - if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0) - return (0); - - count = pmap_clear_bit(m, PTE_REF, NULL); - - return (count); -} - -/* - * Map a wired page into kernel virtual address space. - */ -void -pmap_kenter(vm_offset_t va, vm_offset_t pa) -{ - u_int pte_lo; - int error; - int i; - -#if 0 - if (va < VM_MIN_KERNEL_ADDRESS) - panic("pmap_kenter: attempt to enter non-kernel address %#x", - va); -#endif - - pte_lo = PTE_I | PTE_G; - for (i = 0; i < pregions_sz; i++) { - if ((pa >= pregions[i].mr_start) && - (pa < (pregions[i].mr_start + pregions[i].mr_size))) { - pte_lo &= ~(PTE_I | PTE_G); - break; - } - } - - PMAP_LOCK(kernel_pmap); - error = pmap_pvo_enter(kernel_pmap, pmap_upvo_zone, - &pmap_pvo_kunmanaged, va, pa, pte_lo, PVO_WIRED); - - if (error != 0 && error != ENOENT) - panic("pmap_kenter: failed to enter va %#x pa %#x: %d", va, - pa, error); - - /* - * Flush the real memory from the instruction cache. - */ - if ((pte_lo & (PTE_I | PTE_G)) == 0) { - pmap_syncicache(pa, PAGE_SIZE); - } - PMAP_UNLOCK(kernel_pmap); -} - -/* - * Extract the physical page address associated with the given kernel virtual - * address. - */ -vm_offset_t -pmap_kextract(vm_offset_t va) -{ - struct pvo_entry *pvo; - vm_paddr_t pa; - -#ifdef UMA_MD_SMALL_ALLOC - /* - * Allow direct mappings - */ - if (va < VM_MIN_KERNEL_ADDRESS) { - return (va); - } -#endif - - PMAP_LOCK(kernel_pmap); - pvo = pmap_pvo_find_va(kernel_pmap, va & ~ADDR_POFF, NULL); - KASSERT(pvo != NULL, ("pmap_kextract: no addr found")); - pa = (pvo->pvo_pte.pte_lo & PTE_RPGN) | (va & ADDR_POFF); - PMAP_UNLOCK(kernel_pmap); - return (pa); -} - -/* - * Remove a wired page from kernel virtual address space. - */ -void -pmap_kremove(vm_offset_t va) -{ - - pmap_remove(kernel_pmap, va, va + PAGE_SIZE); -} - -/* - * Map a range of physical addresses into kernel virtual address space. - * - * The value passed in *virt is a suggested virtual address for the mapping. - * Architectures which can support a direct-mapped physical to virtual region - * can return the appropriate address within that region, leaving '*virt' - * unchanged. We cannot and therefore do not; *virt is updated with the - * first usable address after the mapped region. - */ -vm_offset_t -pmap_map(vm_offset_t *virt, vm_offset_t pa_start, vm_offset_t pa_end, int prot) -{ - vm_offset_t sva, va; - - sva = *virt; - va = sva; - for (; pa_start < pa_end; pa_start += PAGE_SIZE, va += PAGE_SIZE) - pmap_kenter(va, pa_start); - *virt = va; - return (sva); -} - -int -pmap_mincore(pmap_t pmap, vm_offset_t addr) -{ - TODO; - return (0); -} - -void -pmap_object_init_pt(pmap_t pm, vm_offset_t addr, vm_object_t object, - vm_pindex_t pindex, vm_size_t size) -{ - - VM_OBJECT_LOCK_ASSERT(object, MA_OWNED); - KASSERT(object->type == OBJT_DEVICE, - ("pmap_object_init_pt: non-device object")); - KASSERT(pm == &curproc->p_vmspace->vm_pmap || pm == kernel_pmap, - ("pmap_object_init_pt: non current pmap")); -} - -/* - * Lower the permission for all mappings to a given page. - */ -void -pmap_page_protect(vm_page_t m, vm_prot_t prot) -{ - struct pvo_head *pvo_head; - struct pvo_entry *pvo, *next_pvo; - struct pte *pt; - pmap_t pmap; - - /* - * Since the routine only downgrades protection, if the - * maximal protection is desired, there isn't any change - * to be made. - */ - if ((prot & (VM_PROT_READ|VM_PROT_WRITE)) == - (VM_PROT_READ|VM_PROT_WRITE)) - return; - - pvo_head = vm_page_to_pvoh(m); - for (pvo = LIST_FIRST(pvo_head); pvo != NULL; pvo = next_pvo) { - next_pvo = LIST_NEXT(pvo, pvo_vlink); - PMAP_PVO_CHECK(pvo); /* sanity check */ - pmap = pvo->pvo_pmap; - PMAP_LOCK(pmap); - - /* - * Downgrading to no mapping at all, we just remove the entry. - */ - if ((prot & VM_PROT_READ) == 0) { - pmap_pvo_remove(pvo, -1); - PMAP_UNLOCK(pmap); - continue; - } - - /* - * If EXEC permission is being revoked, just clear the flag - * in the PVO. - */ - if ((prot & VM_PROT_EXECUTE) == 0) - pvo->pvo_vaddr &= ~PVO_EXECUTABLE; - - /* - * If this entry is already RO, don't diddle with the page - * table. - */ - if ((pvo->pvo_pte.pte_lo & PTE_PP) == PTE_BR) { - PMAP_UNLOCK(pmap); - PMAP_PVO_CHECK(pvo); - continue; - } - - /* - * Grab the PTE before we diddle the bits so pvo_to_pte can - * verify the pte contents are as expected. - */ - pt = pmap_pvo_to_pte(pvo, -1); - pvo->pvo_pte.pte_lo &= ~PTE_PP; - pvo->pvo_pte.pte_lo |= PTE_BR; - if (pt != NULL) - pmap_pte_change(pt, &pvo->pvo_pte, pvo->pvo_vaddr); - PMAP_UNLOCK(pmap); - PMAP_PVO_CHECK(pvo); /* sanity check */ - } - - /* - * Downgrading from writeable: clear the VM page flag - */ - if ((prot & VM_PROT_WRITE) != VM_PROT_WRITE) - vm_page_flag_clear(m, PG_WRITEABLE); -} - -/* - * Returns true if the pmap's pv is one of the first - * 16 pvs linked to from this page. This count may - * be changed upwards or downwards in the future; it - * is only necessary that true be returned for a small - * subset of pmaps for proper page aging. - */ -boolean_t -pmap_page_exists_quick(pmap_t pmap, vm_page_t m) -{ - int loops; - struct pvo_entry *pvo; - - if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) - return FALSE; - - loops = 0; - LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { - if (pvo->pvo_pmap == pmap) - return (TRUE); - if (++loops >= 16) - break; - } - - return (FALSE); -} - -static u_int pmap_vsidcontext; - -void -pmap_pinit(pmap_t pmap) -{ - int i, mask; - u_int entropy; - - KASSERT((int)pmap < VM_MIN_KERNEL_ADDRESS, ("pmap_pinit: virt pmap")); - PMAP_LOCK_INIT(pmap); - - entropy = 0; - __asm __volatile("mftb %0" : "=r"(entropy)); - - /* - * Allocate some segment registers for this pmap. - */ - for (i = 0; i < NPMAPS; i += VSID_NBPW) { - u_int hash, n; - - /* - * Create a new value by mutiplying by a prime and adding in - * entropy from the timebase register. This is to make the - * VSID more random so that the PT hash function collides - * less often. (Note that the prime casues gcc to do shifts - * instead of a multiply.) - */ - pmap_vsidcontext = (pmap_vsidcontext * 0x1105) + entropy; - hash = pmap_vsidcontext & (NPMAPS - 1); - if (hash == 0) /* 0 is special, avoid it */ - continue; - n = hash >> 5; - mask = 1 << (hash & (VSID_NBPW - 1)); - hash = (pmap_vsidcontext & 0xfffff); - if (pmap_vsid_bitmap[n] & mask) { /* collision? */ - /* anything free in this bucket? */ - if (pmap_vsid_bitmap[n] == 0xffffffff) { - entropy = (pmap_vsidcontext >> 20); - continue; - } - i = ffs(~pmap_vsid_bitmap[i]) - 1; - mask = 1 << i; - hash &= 0xfffff & ~(VSID_NBPW - 1); - hash |= i; - } - pmap_vsid_bitmap[n] |= mask; - for (i = 0; i < 16; i++) - pmap->pm_sr[i] = VSID_MAKE(i, hash); - return; - } - - panic("pmap_pinit: out of segments"); -} - -/* - * Initialize the pmap associated with process 0. - */ -void -pmap_pinit0(pmap_t pm) -{ - - pmap_pinit(pm); - bzero(&pm->pm_stats, sizeof(pm->pm_stats)); -} - -/* - * Set the physical protection on the specified range of this map as requested. - */ -void -pmap_protect(pmap_t pm, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot) -{ - struct pvo_entry *pvo; - struct pte *pt; - int pteidx; - - CTR4(KTR_PMAP, "pmap_protect: pm=%p sva=%#x eva=%#x prot=%#x", pm, sva, - eva, prot); - - - KASSERT(pm == &curproc->p_vmspace->vm_pmap || pm == kernel_pmap, - ("pmap_protect: non current pmap")); - - if ((prot & VM_PROT_READ) == VM_PROT_NONE) { - mtx_lock(&Giant); - pmap_remove(pm, sva, eva); - mtx_unlock(&Giant); - return; - } - - mtx_lock(&Giant); - vm_page_lock_queues(); - PMAP_LOCK(pm); - for (; sva < eva; sva += PAGE_SIZE) { - pvo = pmap_pvo_find_va(pm, sva, &pteidx); - if (pvo == NULL) - continue; - - if ((prot & VM_PROT_EXECUTE) == 0) - pvo->pvo_vaddr &= ~PVO_EXECUTABLE; - - /* - * Grab the PTE pointer before we diddle with the cached PTE - * copy. - */ - pt = pmap_pvo_to_pte(pvo, pteidx); - /* - * Change the protection of the page. - */ - pvo->pvo_pte.pte_lo &= ~PTE_PP; - pvo->pvo_pte.pte_lo |= PTE_BR; - - /* - * If the PVO is in the page table, update that pte as well. - */ - if (pt != NULL) - pmap_pte_change(pt, &pvo->pvo_pte, pvo->pvo_vaddr); - } - vm_page_unlock_queues(); - PMAP_UNLOCK(pm); - mtx_unlock(&Giant); -} - -/* - * Map a list of wired pages into kernel virtual address space. This is - * intended for temporary mappings which do not need page modification or - * references recorded. Existing mappings in the region are overwritten. - */ -void -pmap_qenter(vm_offset_t sva, vm_page_t *m, int count) -{ - vm_offset_t va; - - va = sva; - while (count-- > 0) { - pmap_kenter(va, VM_PAGE_TO_PHYS(*m)); - va += PAGE_SIZE; - m++; - } -} - -/* - * Remove page mappings from kernel virtual address space. Intended for - * temporary mappings entered by pmap_qenter. - */ -void -pmap_qremove(vm_offset_t sva, int count) -{ - vm_offset_t va; - - va = sva; - while (count-- > 0) { - pmap_kremove(va); - va += PAGE_SIZE; - } -} - -void -pmap_release(pmap_t pmap) -{ - int idx, mask; - - /* - * Free segment register's VSID - */ - if (pmap->pm_sr[0] == 0) - panic("pmap_release"); - - idx = VSID_TO_HASH(pmap->pm_sr[0]) & (NPMAPS-1); - mask = 1 << (idx % VSID_NBPW); - idx /= VSID_NBPW; - pmap_vsid_bitmap[idx] &= ~mask; - PMAP_LOCK_DESTROY(pmap); -} - -/* - * Remove the given range of addresses from the specified map. - */ -void -pmap_remove(pmap_t pm, vm_offset_t sva, vm_offset_t eva) -{ - struct pvo_entry *pvo; - int pteidx; - - vm_page_lock_queues(); - PMAP_LOCK(pm); - for (; sva < eva; sva += PAGE_SIZE) { - pvo = pmap_pvo_find_va(pm, sva, &pteidx); - if (pvo != NULL) { - pmap_pvo_remove(pvo, pteidx); - } - } - PMAP_UNLOCK(pm); - vm_page_unlock_queues(); -} - -/* - * Remove physical page from all pmaps in which it resides. pmap_pvo_remove() - * will reflect changes in pte's back to the vm_page. - */ -void -pmap_remove_all(vm_page_t m) -{ - struct pvo_head *pvo_head; - struct pvo_entry *pvo, *next_pvo; - pmap_t pmap; - - mtx_assert(&vm_page_queue_mtx, MA_OWNED); - - pvo_head = vm_page_to_pvoh(m); - for (pvo = LIST_FIRST(pvo_head); pvo != NULL; pvo = next_pvo) { - next_pvo = LIST_NEXT(pvo, pvo_vlink); - - PMAP_PVO_CHECK(pvo); /* sanity check */ - pmap = pvo->pvo_pmap; - PMAP_LOCK(pmap); - pmap_pvo_remove(pvo, -1); - PMAP_UNLOCK(pmap); - } - vm_page_flag_clear(m, PG_WRITEABLE); -} - -/* - * Remove all pages from specified address space, this aids process exit - * speeds. This is much faster than pmap_remove in the case of running down - * an entire address space. Only works for the current pmap. - */ -void -pmap_remove_pages(pmap_t pm, vm_offset_t sva, vm_offset_t eva) -{ -} - -/* - * Allocate a physical page of memory directly from the phys_avail map. - * Can only be called from pmap_bootstrap before avail start and end are - * calculated. - */ -static vm_offset_t -pmap_bootstrap_alloc(vm_size_t size, u_int align) -{ - vm_offset_t s, e; - int i, j; - - size = round_page(size); - for (i = 0; phys_avail[i + 1] != 0; i += 2) { - if (align != 0) - s = (phys_avail[i] + align - 1) & ~(align - 1); - else - s = phys_avail[i]; - e = s + size; - - if (s < phys_avail[i] || e > phys_avail[i + 1]) - continue; - - if (s == phys_avail[i]) { - phys_avail[i] += size; - } else if (e == phys_avail[i + 1]) { - phys_avail[i + 1] -= size; - } else { - for (j = phys_avail_count * 2; j > i; j -= 2) { - phys_avail[j] = phys_avail[j - 2]; - phys_avail[j + 1] = phys_avail[j - 1]; - } - - phys_avail[i + 3] = phys_avail[i + 1]; - phys_avail[i + 1] = s; - phys_avail[i + 2] = e; - phys_avail_count++; - } - - return (s); - } - panic("pmap_bootstrap_alloc: could not allocate memory"); -} - -/* - * Return an unmapped pvo for a kernel virtual address. - * Used by pmap functions that operate on physical pages. - */ -static struct pvo_entry * -pmap_rkva_alloc(void) -{ - struct pvo_entry *pvo; - struct pte *pt; - vm_offset_t kva; - int pteidx; - - if (pmap_rkva_count == 0) - panic("pmap_rkva_alloc: no more reserved KVAs"); - - kva = pmap_rkva_start + (PAGE_SIZE * --pmap_rkva_count); - pmap_kenter(kva, 0); - - pvo = pmap_pvo_find_va(kernel_pmap, kva, &pteidx); - - if (pvo == NULL) - panic("pmap_kva_alloc: pmap_pvo_find_va failed"); - - pt = pmap_pvo_to_pte(pvo, pteidx); - - if (pt == NULL) - panic("pmap_kva_alloc: pmap_pvo_to_pte failed"); - - pmap_pte_unset(pt, &pvo->pvo_pte, pvo->pvo_vaddr); - PVO_PTEGIDX_CLR(pvo); - - pmap_pte_overflow++; - - return (pvo); -} - -static void -pmap_pa_map(struct pvo_entry *pvo, vm_offset_t pa, struct pte *saved_pt, - int *depth_p) -{ - struct pte *pt; - - /* - * If this pvo already has a valid pte, we need to save it so it can - * be restored later. We then just reload the new PTE over the old - * slot. - */ - if (saved_pt != NULL) { - pt = pmap_pvo_to_pte(pvo, -1); - - if (pt != NULL) { - pmap_pte_unset(pt, &pvo->pvo_pte, pvo->pvo_vaddr); - PVO_PTEGIDX_CLR(pvo); - pmap_pte_overflow++; - } - - *saved_pt = pvo->pvo_pte; - - pvo->pvo_pte.pte_lo &= ~PTE_RPGN; - } - - pvo->pvo_pte.pte_lo |= pa; - - if (!pmap_pte_spill(pvo->pvo_vaddr)) - panic("pmap_pa_map: could not spill pvo %p", pvo); - - if (depth_p != NULL) - (*depth_p)++; -} - -static void -pmap_pa_unmap(struct pvo_entry *pvo, struct pte *saved_pt, int *depth_p) -{ - struct pte *pt; - - pt = pmap_pvo_to_pte(pvo, -1); - - if (pt != NULL) { - pmap_pte_unset(pt, &pvo->pvo_pte, pvo->pvo_vaddr); - PVO_PTEGIDX_CLR(pvo); - pmap_pte_overflow++; - } - - pvo->pvo_pte.pte_lo &= ~PTE_RPGN; - - /* - * If there is a saved PTE and it's valid, restore it and return. - */ - if (saved_pt != NULL && (saved_pt->pte_lo & PTE_RPGN) != 0) { - if (depth_p != NULL && --(*depth_p) == 0) - panic("pmap_pa_unmap: restoring but depth == 0"); - - pvo->pvo_pte = *saved_pt; - - if (!pmap_pte_spill(pvo->pvo_vaddr)) - panic("pmap_pa_unmap: could not spill pvo %p", pvo); - } -} - -static void -pmap_syncicache(vm_offset_t pa, vm_size_t len) -{ - __syncicache((void *)pa, len); -} - -static void -tlbia(void) -{ - caddr_t i; - - SYNC(); - for (i = 0; i < (caddr_t)0x00040000; i += 0x00001000) { - TLBIE(i); - EIEIO(); - } - TLBSYNC(); - SYNC(); -} - -static int -pmap_pvo_enter(pmap_t pm, uma_zone_t zone, struct pvo_head *pvo_head, - vm_offset_t va, vm_offset_t pa, u_int pte_lo, int flags) -{ - struct pvo_entry *pvo; - u_int sr; - int first; - u_int ptegidx; - int i; - int bootstrap; - - pmap_pvo_enter_calls++; - first = 0; - bootstrap = 0; - - /* - * Compute the PTE Group index. - */ - va &= ~ADDR_POFF; - sr = va_to_sr(pm->pm_sr, va); - ptegidx = va_to_pteg(sr, va); - - /* - * Remove any existing mapping for this page. Reuse the pvo entry if - * there is a mapping. - */ - mtx_lock(&pmap_table_mutex); - LIST_FOREACH(pvo, &pmap_pvo_table[ptegidx], pvo_olink) { - if (pvo->pvo_pmap == pm && PVO_VADDR(pvo) == va) { - if ((pvo->pvo_pte.pte_lo & PTE_RPGN) == pa && - (pvo->pvo_pte.pte_lo & PTE_PP) == - (pte_lo & PTE_PP)) { - mtx_unlock(&pmap_table_mutex); - return (0); - } - pmap_pvo_remove(pvo, -1); - break; - } - } - - /* - * If we aren't overwriting a mapping, try to allocate. - */ - if (pmap_initialized) { - pvo = uma_zalloc(zone, M_NOWAIT); - } else { - if (pmap_bpvo_pool_index >= BPVO_POOL_SIZE) { - panic("pmap_enter: bpvo pool exhausted, %d, %d, %d", - pmap_bpvo_pool_index, BPVO_POOL_SIZE, - BPVO_POOL_SIZE * sizeof(struct pvo_entry)); - } - pvo = &pmap_bpvo_pool[pmap_bpvo_pool_index]; - pmap_bpvo_pool_index++; - bootstrap = 1; - } - - if (pvo == NULL) { - mtx_unlock(&pmap_table_mutex); - return (ENOMEM); - } - - pmap_pvo_entries++; - pvo->pvo_vaddr = va; - pvo->pvo_pmap = pm; - LIST_INSERT_HEAD(&pmap_pvo_table[ptegidx], pvo, pvo_olink); - pvo->pvo_vaddr &= ~ADDR_POFF; - if (flags & VM_PROT_EXECUTE) - pvo->pvo_vaddr |= PVO_EXECUTABLE; - if (flags & PVO_WIRED) - pvo->pvo_vaddr |= PVO_WIRED; - if (pvo_head != &pmap_pvo_kunmanaged) - pvo->pvo_vaddr |= PVO_MANAGED; - if (bootstrap) - pvo->pvo_vaddr |= PVO_BOOTSTRAP; - if (flags & PVO_FAKE) - pvo->pvo_vaddr |= PVO_FAKE; - - pmap_pte_create(&pvo->pvo_pte, sr, va, pa | pte_lo); - - /* - * Remember if the list was empty and therefore will be the first - * item. - */ - if (LIST_FIRST(pvo_head) == NULL) - first = 1; - LIST_INSERT_HEAD(pvo_head, pvo, pvo_vlink); - - if (pvo->pvo_pte.pte_lo & PVO_WIRED) - pm->pm_stats.wired_count++; - pm->pm_stats.resident_count++; - - /* - * We hope this succeeds but it isn't required. - */ - i = pmap_pte_insert(ptegidx, &pvo->pvo_pte); - if (i >= 0) { - PVO_PTEGIDX_SET(pvo, i); - } else { - panic("pmap_pvo_enter: overflow"); - pmap_pte_overflow++; - } - mtx_unlock(&pmap_table_mutex); - - return (first ? ENOENT : 0); -} - -static void -pmap_pvo_remove(struct pvo_entry *pvo, int pteidx) -{ - struct pte *pt; - - /* - * If there is an active pte entry, we need to deactivate it (and - * save the ref & cfg bits). - */ - pt = pmap_pvo_to_pte(pvo, pteidx); - if (pt != NULL) { - pmap_pte_unset(pt, &pvo->pvo_pte, pvo->pvo_vaddr); - PVO_PTEGIDX_CLR(pvo); - } else { - pmap_pte_overflow--; - } - - /* - * Update our statistics. - */ - pvo->pvo_pmap->pm_stats.resident_count--; - if (pvo->pvo_pte.pte_lo & PVO_WIRED) - pvo->pvo_pmap->pm_stats.wired_count--; - - /* - * Save the REF/CHG bits into their cache if the page is managed. - */ - if ((pvo->pvo_vaddr & (PVO_MANAGED|PVO_FAKE)) == PVO_MANAGED) { - struct vm_page *pg; - - pg = PHYS_TO_VM_PAGE(pvo->pvo_pte.pte_lo & PTE_RPGN); - if (pg != NULL) { - pmap_attr_save(pg, pvo->pvo_pte.pte_lo & - (PTE_REF | PTE_CHG)); - } - } - - /* - * Remove this PVO from the PV list. - */ - LIST_REMOVE(pvo, pvo_vlink); - - /* - * Remove this from the overflow list and return it to the pool - * if we aren't going to reuse it. - */ - LIST_REMOVE(pvo, pvo_olink); - if (!(pvo->pvo_vaddr & PVO_BOOTSTRAP)) - uma_zfree(pvo->pvo_vaddr & PVO_MANAGED ? pmap_mpvo_zone : - pmap_upvo_zone, pvo); - pmap_pvo_entries--; - pmap_pvo_remove_calls++; -} - -static __inline int -pmap_pvo_pte_index(const struct pvo_entry *pvo, int ptegidx) -{ - int pteidx; - - /* - * We can find the actual pte entry without searching by grabbing - * the PTEG index from 3 unused bits in pte_lo[11:9] and by - * noticing the HID bit. - */ - pteidx = ptegidx * 8 + PVO_PTEGIDX_GET(pvo); - if (pvo->pvo_pte.pte_hi & PTE_HID) - pteidx ^= pmap_pteg_mask * 8; - - return (pteidx); -} - -static struct pvo_entry * -pmap_pvo_find_va(pmap_t pm, vm_offset_t va, int *pteidx_p) -{ - struct pvo_entry *pvo; - int ptegidx; - u_int sr; - - va &= ~ADDR_POFF; - sr = va_to_sr(pm->pm_sr, va); - ptegidx = va_to_pteg(sr, va); - - mtx_lock(&pmap_table_mutex); - LIST_FOREACH(pvo, &pmap_pvo_table[ptegidx], pvo_olink) { - if (pvo->pvo_pmap == pm && PVO_VADDR(pvo) == va) { - if (pteidx_p) - *pteidx_p = pmap_pvo_pte_index(pvo, ptegidx); - break; - } - } - mtx_unlock(&pmap_table_mutex); - - return (pvo); -} - -static struct pte * -pmap_pvo_to_pte(const struct pvo_entry *pvo, int pteidx) -{ - struct pte *pt; - - /* - * If we haven't been supplied the ptegidx, calculate it. - */ - if (pteidx == -1) { - int ptegidx; - u_int sr; - - sr = va_to_sr(pvo->pvo_pmap->pm_sr, pvo->pvo_vaddr); - ptegidx = va_to_pteg(sr, pvo->pvo_vaddr); - pteidx = pmap_pvo_pte_index(pvo, ptegidx); - } - - pt = &pmap_pteg_table[pteidx >> 3].pt[pteidx & 7]; - - if ((pvo->pvo_pte.pte_hi & PTE_VALID) && !PVO_PTEGIDX_ISSET(pvo)) { - panic("pmap_pvo_to_pte: pvo %p has valid pte in pvo but no " - "valid pte index", pvo); - } - - if ((pvo->pvo_pte.pte_hi & PTE_VALID) == 0 && PVO_PTEGIDX_ISSET(pvo)) { - panic("pmap_pvo_to_pte: pvo %p has valid pte index in pvo " - "pvo but no valid pte", pvo); - } - - if ((pt->pte_hi ^ (pvo->pvo_pte.pte_hi & ~PTE_VALID)) == PTE_VALID) { - if ((pvo->pvo_pte.pte_hi & PTE_VALID) == 0) { - panic("pmap_pvo_to_pte: pvo %p has valid pte in " - "pmap_pteg_table %p but invalid in pvo", pvo, pt); - } - - if (((pt->pte_lo ^ pvo->pvo_pte.pte_lo) & ~(PTE_CHG|PTE_REF)) - != 0) { - panic("pmap_pvo_to_pte: pvo %p pte does not match " - "pte %p in pmap_pteg_table", pvo, pt); - } - - return (pt); - } - - if (pvo->pvo_pte.pte_hi & PTE_VALID) { - panic("pmap_pvo_to_pte: pvo %p has invalid pte %p in " - "pmap_pteg_table but valid in pvo", pvo, pt); - } - - return (NULL); -} - -/* - * XXX: THIS STUFF SHOULD BE IN pte.c? - */ -int -pmap_pte_spill(vm_offset_t addr) -{ - struct pvo_entry *source_pvo, *victim_pvo; - struct pvo_entry *pvo; - int ptegidx, i, j; - u_int sr; - struct pteg *pteg; - struct pte *pt; - - pmap_pte_spills++; - - sr = mfsrin(addr); - ptegidx = va_to_pteg(sr, addr); - - /* - * Have to substitute some entry. Use the primary hash for this. - * Use low bits of timebase as random generator. - */ - pteg = &pmap_pteg_table[ptegidx]; - mtx_lock(&pmap_table_mutex); - __asm __volatile("mftb %0" : "=r"(i)); - i &= 7; - pt = &pteg->pt[i]; - - source_pvo = NULL; - victim_pvo = NULL; - LIST_FOREACH(pvo, &pmap_pvo_table[ptegidx], pvo_olink) { - /* - * We need to find a pvo entry for this address. - */ - PMAP_PVO_CHECK(pvo); - if (source_pvo == NULL && - pmap_pte_match(&pvo->pvo_pte, sr, addr, - pvo->pvo_pte.pte_hi & PTE_HID)) { - /* - * Now found an entry to be spilled into the pteg. - * The PTE is now valid, so we know it's active. - */ - j = pmap_pte_insert(ptegidx, &pvo->pvo_pte); - - if (j >= 0) { - PVO_PTEGIDX_SET(pvo, j); - pmap_pte_overflow--; - PMAP_PVO_CHECK(pvo); - mtx_unlock(&pmap_table_mutex); - return (1); - } - - source_pvo = pvo; - - if (victim_pvo != NULL) - break; - } - - /* - * We also need the pvo entry of the victim we are replacing - * so save the R & C bits of the PTE. - */ - if ((pt->pte_hi & PTE_HID) == 0 && victim_pvo == NULL && - pmap_pte_compare(pt, &pvo->pvo_pte)) { - victim_pvo = pvo; - if (source_pvo != NULL) - break; - } - } - - if (source_pvo == NULL) { - mtx_unlock(&pmap_table_mutex); - return (0); - } - - if (victim_pvo == NULL) { - if ((pt->pte_hi & PTE_HID) == 0) - panic("pmap_pte_spill: victim p-pte (%p) has no pvo" - "entry", pt); - - /* - * If this is a secondary PTE, we need to search it's primary - * pvo bucket for the matching PVO. - */ - LIST_FOREACH(pvo, &pmap_pvo_table[ptegidx ^ pmap_pteg_mask], - pvo_olink) { - PMAP_PVO_CHECK(pvo); - /* - * We also need the pvo entry of the victim we are - * replacing so save the R & C bits of the PTE. - */ - if (pmap_pte_compare(pt, &pvo->pvo_pte)) { - victim_pvo = pvo; - break; - } - } - - if (victim_pvo == NULL) - panic("pmap_pte_spill: victim s-pte (%p) has no pvo" - "entry", pt); - } - - /* - * We are invalidating the TLB entry for the EA we are replacing even - * though it's valid. If we don't, we lose any ref/chg bit changes - * contained in the TLB entry. - */ - source_pvo->pvo_pte.pte_hi &= ~PTE_HID; - - pmap_pte_unset(pt, &victim_pvo->pvo_pte, victim_pvo->pvo_vaddr); - pmap_pte_set(pt, &source_pvo->pvo_pte); - - PVO_PTEGIDX_CLR(victim_pvo); - PVO_PTEGIDX_SET(source_pvo, i); - pmap_pte_replacements++; - - PMAP_PVO_CHECK(victim_pvo); - PMAP_PVO_CHECK(source_pvo); - - mtx_unlock(&pmap_table_mutex); - return (1); -} - -static int -pmap_pte_insert(u_int ptegidx, struct pte *pvo_pt) -{ - struct pte *pt; - int i; - - /* - * First try primary hash. - */ - for (pt = pmap_pteg_table[ptegidx].pt, i = 0; i < 8; i++, pt++) { - if ((pt->pte_hi & PTE_VALID) == 0) { - pvo_pt->pte_hi &= ~PTE_HID; - pmap_pte_set(pt, pvo_pt); - return (i); - } - } - - /* - * Now try secondary hash. - */ - ptegidx ^= pmap_pteg_mask; - ptegidx++; - for (pt = pmap_pteg_table[ptegidx].pt, i = 0; i < 8; i++, pt++) { - if ((pt->pte_hi & PTE_VALID) == 0) { - pvo_pt->pte_hi |= PTE_HID; - pmap_pte_set(pt, pvo_pt); - return (i); - } - } - - panic("pmap_pte_insert: overflow"); - return (-1); -} - -static boolean_t -pmap_query_bit(vm_page_t m, int ptebit) -{ - struct pvo_entry *pvo; - struct pte *pt; - -#if 0 - if (pmap_attr_fetch(m) & ptebit) - return (TRUE); -#endif - - LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { - PMAP_PVO_CHECK(pvo); /* sanity check */ - - /* - * See if we saved the bit off. If so, cache it and return - * success. - */ - if (pvo->pvo_pte.pte_lo & ptebit) { - pmap_attr_save(m, ptebit); - PMAP_PVO_CHECK(pvo); /* sanity check */ - return (TRUE); - } - } - - /* - * No luck, now go through the hard part of looking at the PTEs - * themselves. Sync so that any pending REF/CHG bits are flushed to - * the PTEs. - */ - SYNC(); - LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { - PMAP_PVO_CHECK(pvo); /* sanity check */ - - /* - * See if this pvo has a valid PTE. if so, fetch the - * REF/CHG bits from the valid PTE. If the appropriate - * ptebit is set, cache it and return success. - */ - pt = pmap_pvo_to_pte(pvo, -1); - if (pt != NULL) { - pmap_pte_synch(pt, &pvo->pvo_pte); - if (pvo->pvo_pte.pte_lo & ptebit) { - pmap_attr_save(m, ptebit); - PMAP_PVO_CHECK(pvo); /* sanity check */ - return (TRUE); - } - } - } - - return (FALSE); -} - -static u_int -pmap_clear_bit(vm_page_t m, int ptebit, int *origbit) -{ - u_int count; - struct pvo_entry *pvo; - struct pte *pt; - int rv; - - /* - * Clear the cached value. - */ - rv = pmap_attr_fetch(m); - pmap_attr_clear(m, ptebit); - - /* - * Sync so that any pending REF/CHG bits are flushed to the PTEs (so - * we can reset the right ones). note that since the pvo entries and - * list heads are accessed via BAT0 and are never placed in the page - * table, we don't have to worry about further accesses setting the - * REF/CHG bits. - */ - SYNC(); - - /* - * For each pvo entry, clear the pvo's ptebit. If this pvo has a - * valid pte clear the ptebit from the valid pte. - */ - count = 0; - LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) { - PMAP_PVO_CHECK(pvo); /* sanity check */ - pt = pmap_pvo_to_pte(pvo, -1); - if (pt != NULL) { - pmap_pte_synch(pt, &pvo->pvo_pte); - if (pvo->pvo_pte.pte_lo & ptebit) { - count++; - pmap_pte_clear(pt, PVO_VADDR(pvo), ptebit); - } - } - rv |= pvo->pvo_pte.pte_lo; - pvo->pvo_pte.pte_lo &= ~ptebit; - PMAP_PVO_CHECK(pvo); /* sanity check */ - } - - if (origbit != NULL) { - *origbit = rv; - } - - return (count); -} - -/* - * Return true if the physical range is encompassed by the battable[idx] - */ -static int -pmap_bat_mapped(int idx, vm_offset_t pa, vm_size_t size) -{ - u_int prot; - u_int32_t start; - u_int32_t end; - u_int32_t bat_ble; - - /* - * Return immediately if not a valid mapping - */ - if (!battable[idx].batu & BAT_Vs) - return (EINVAL); - - /* - * The BAT entry must be cache-inhibited, guarded, and r/w - * so it can function as an i/o page - */ - prot = battable[idx].batl & (BAT_I|BAT_G|BAT_PP_RW); - if (prot != (BAT_I|BAT_G|BAT_PP_RW)) - return (EPERM); - - /* - * The address should be within the BAT range. Assume that the - * start address in the BAT has the correct alignment (thus - * not requiring masking) - */ - start = battable[idx].batl & BAT_PBS; - bat_ble = (battable[idx].batu & ~(BAT_EBS)) | 0x03; - end = start | (bat_ble << 15) | 0x7fff; - - if ((pa < start) || ((pa + size) > end)) - return (ERANGE); - - return (0); -} - -int -pmap_dev_direct_mapped(vm_offset_t pa, vm_size_t size) -{ - int i; - - /* - * This currently does not work for entries that - * overlap 256M BAT segments. - */ - - for(i = 0; i < 16; i++) - if (pmap_bat_mapped(i, pa, size) == 0) - return (0); - - return (EFAULT); -} - -/* - * Map a set of physical memory pages into the kernel virtual - * address space. Return a pointer to where it is mapped. This - * routine is intended to be used for mapping device memory, - * NOT real memory. - */ -void * -pmap_mapdev(vm_offset_t pa, vm_size_t size) -{ - vm_offset_t va, tmpva, ppa, offset; - int i; - - ppa = trunc_page(pa); - offset = pa & PAGE_MASK; - size = roundup(offset + size, PAGE_SIZE); - - GIANT_REQUIRED; - - /* - * If the physical address lies within a valid BAT table entry, - * return the 1:1 mapping. This currently doesn't work - * for regions that overlap 256M BAT segments. - */ - for (i = 0; i < 16; i++) { - if (pmap_bat_mapped(i, pa, size) == 0) - return ((void *) pa); - } - - va = kmem_alloc_nofault(kernel_map, size); - if (!va) - panic("pmap_mapdev: Couldn't alloc kernel virtual memory"); - - for (tmpva = va; size > 0;) { - pmap_kenter(tmpva, ppa); - TLBIE(tmpva); /* XXX or should it be invalidate-all ? */ - size -= PAGE_SIZE; - tmpva += PAGE_SIZE; - ppa += PAGE_SIZE; - } - - return ((void *)(va + offset)); -} - -void -pmap_unmapdev(vm_offset_t va, vm_size_t size) -{ - vm_offset_t base, offset; - - /* - * If this is outside kernel virtual space, then it's a - * battable entry and doesn't require unmapping - */ - if ((va >= VM_MIN_KERNEL_ADDRESS) && (va <= VM_MAX_KERNEL_ADDRESS)) { - base = trunc_page(va); - offset = va & PAGE_MASK; - size = roundup(offset + size, PAGE_SIZE); - kmem_free(kernel_map, base, size); - } -} |