FreeBSD/mips port. The FreeBSD/mips port targets mips32, mips64,

mips32r2 and mips64r2 (and close relatives) processors.  There
presently is support for ADMtek ADM5120, A mips 4Kc in a malta board,
the RB533 routerboard (based on IDT RC32434) and some preliminary
support for sibtye/broadcom designs.  Other hardware support will be
forthcomcing.

This port boots multiuser under gxemul emulating the malta board and
also bootstraps on the hardware whose support is forthcoming...

Oleksandr Tymoshenko, Wojciech Koszek, Warner Losh, Olivier Houchard,
Randall Stewert and others that have contributed to the mips2 and/or
mips2-jnpr perforce branches.  Juniper contirbuted a generic mips port
late in the life cycle of the misp2 branch.  Warner Losh merged the
mips2 and Juniper code bases, and others list above have worked for
the past several months to get to multiuser.

In addition, the mips2 work owe a debt to the trail blazing efforts of
the original mips branch in perforce done by Juli Mallett.

1 files changed, 231 insertions, 0 deletions

diff --git a/sys/mips/include/pmap.h b/sys/mips/include/pmap.h
new file mode 100644
index 0000000..046c514
--- /dev/null
+++ b/sys/mips/include/pmap.h
@@ -0,0 +1,231 @@
+/*
+ * Copyright (c) 1991 Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * the Systems Programming Group of the University of Utah Computer
+ * Science Department and William Jolitz of UUNET Technologies 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.
+ * 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.
+ *
+ * Derived from hp300 version by Mike Hibler, this version by William
+ * Jolitz uses a recursive map [a pde points to the page directory] to
+ * map the page tables using the pagetables themselves. This is done to
+ * reduce the impact on kernel virtual memory for lots of sparse address
+ * space, and to reduce the cost of memory to each process.
+ *
+ *	from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
+ *	from: @(#)pmap.h	7.4 (Berkeley) 5/12/91
+ *	from: src/sys/i386/include/pmap.h,v 1.65.2.2 2000/11/30 01:54:42 peter
+ *	JNPR: pmap.h,v 1.7.2.1 2007/09/10 07:44:12 girish
+ *      $FreeBSD$
+ */
+
+#ifndef _MACHINE_PMAP_H_
+#define	_MACHINE_PMAP_H_
+
+#include <machine/vmparam.h>
+
+/*
+ * Pte related macros
+ */
+#define	VADDR(pdi, pti)	((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
+
+#define	NKPT		120	/* actual number of kernel page tables */
+
+#ifndef NKPDE
+#define	NKPDE		255	/* addressable number of page tables/pde's */
+#endif
+
+#define	KPTDI		(VM_MIN_KERNEL_ADDRESS >> SEGSHIFT)
+#define	NUSERPGTBLS	(VM_MAXUSER_ADDRESS >> SEGSHIFT)
+
+#ifndef LOCORE
+
+#include <sys/queue.h>
+#include <machine/pte.h>
+#include <sys/_lock.h>
+#include <sys/_mutex.h>
+
+
+/*
+ * Pmap stuff
+ */
+struct pv_entry;
+
+struct md_page {
+	int pv_list_count;
+	int pv_flags;
+	    TAILQ_HEAD(, pv_entry)pv_list;
+};
+
+#define	PV_TABLE_MOD		0x01	/* modified */
+#define	PV_TABLE_REF		0x02	/* referenced */
+
+#define	ASID_BITS		8
+#define	ASIDGEN_BITS		(32 - ASID_BITS)
+#define	ASIDGEN_MASK		((1 << ASIDGEN_BITS) - 1)
+
+struct pmap {
+	pd_entry_t *pm_segtab;	/* KVA of segment table */
+	           TAILQ_HEAD(, pv_entry)pm_pvlist;	/* list of mappings in
+							 * pmap */
+	int pm_count;		/* reference count */
+	int pm_active;		/* active on cpus */
+	struct {
+		u_int32_t asid:ASID_BITS;	/* TLB address space tag */
+		u_int32_t gen:ASIDGEN_BITS;	/* its generation number */
+	}      pm_asid[MAXSMPCPU];
+	struct pmap_statistics pm_stats;	/* pmap statistics */
+	struct vm_page *pm_ptphint;	/* pmap ptp hint */
+	struct mtx pm_mtx;
+};
+
+typedef struct pmap *pmap_t;
+
+#ifdef _KERNEL
+#include <sys/lock.h>
+#include <sys/proc.h>
+#include <vm/vm_map.h>
+
+pt_entry_t *pmap_pte(pmap_t, vm_offset_t);
+pd_entry_t pmap_segmap(pmap_t pmap, vm_offset_t va);
+vm_offset_t pmap_kextract(vm_offset_t va);
+extern pmap_t kernel_pmap;
+
+#define	vtophys(va)	pmap_kextract(((vm_offset_t) (va)))
+
+#define	PMAP_LOCK(pmap)		mtx_lock(&(pmap)->pm_mtx)
+#define	PMAP_LOCK_ASSERT(pmap, type)	mtx_assert(&(pmap)->pm_mtx, (type))
+#define	PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
+#define	PMAP_LOCK_INIT(pmap)	mtx_init(&(pmap)->pm_mtx, "pmap", \
+				    NULL, MTX_DEF)
+#define	PMAP_LOCKED(pmap)	mtx_owned(&(pmap)->pm_mtx)
+#define	PMAP_MTX(pmap)		(&(pmap)->pm_mtx)
+#define	PMAP_TRYLOCK(pmap)	mtx_trylock(&(pmap)->pm_mtx)
+#define	PMAP_UNLOCK(pmap)	mtx_unlock(&(pmap)->pm_mtx)
+
+#define PMAP_LGMEM_LOCK_INIT(sysmap) mtx_init(&(sysmap)->lock, "pmap-lgmem", \
+				    "per-cpu-map", (MTX_DEF| MTX_DUPOK))
+#define PMAP_LGMEM_LOCK(sysmap) mtx_lock(&(sysmap)->lock)
+#define PMAP_LGMEM_UNLOCK(sysmap) mtx_unlock(&(sysmap)->lock)
+#define PMAP_LGMEM_DESTROY(sysmap) mtx_destroy(&(sysmap)->lock)
+
+#endif				/* _KERNEL */
+
+/*
+ * For each vm_page_t, there is a list of all currently valid virtual
+ * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
+ */
+typedef struct pv_entry {
+	pmap_t pv_pmap;		/* pmap where mapping lies */
+	vm_offset_t pv_va;	/* virtual address for mapping */
+	            TAILQ_ENTRY(pv_entry)pv_list;
+	            TAILQ_ENTRY(pv_entry)pv_plist;
+	vm_page_t pv_ptem;	/* VM page for pte */
+	boolean_t pv_wired;	/* whether this entry is wired */
+}       *pv_entry_t;
+
+
+#ifdef	_KERNEL
+
+#if defined(DIAGNOSTIC)
+#define	PMAP_DIAGNOSTIC
+#endif
+
+#if !defined(PMAP_DIAGNOSTIC)
+#define	PMAP_INLINE __inline
+#else
+#define	PMAP_INLINE
+#endif
+
+extern vm_offset_t avail_end;
+extern vm_offset_t avail_start;
+extern vm_offset_t clean_eva;
+extern vm_offset_t clean_sva;
+extern vm_offset_t phys_avail[];
+extern char *ptvmmap;		/* poor name! */
+extern vm_offset_t virtual_avail;
+extern vm_offset_t virtual_end;
+extern pd_entry_t *segbase;
+
+extern vm_paddr_t mips_wired_tlb_physmem_start;
+extern vm_paddr_t mips_wired_tlb_physmem_end;
+extern u_int need_wired_tlb_page_pool;
+
+#define	pmap_page_is_mapped(m)	(!TAILQ_EMPTY(&(m)->md.pv_list))
+#define pmap_kernel() kernel_pmap
+
+void pmap_bootstrap(void);
+void *pmap_mapdev(vm_offset_t, vm_size_t);
+void pmap_unmapdev(vm_offset_t, vm_size_t);
+vm_offset_t pmap_steal_memory(vm_size_t size);
+void pmap_set_modified(vm_offset_t pa);
+int page_is_managed(vm_offset_t pa);
+void pmap_page_is_free(vm_page_t m);
+void pmap_kushmem_reattach(struct proc *);
+ /* PMAP_INLINE */ void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
+ /* PMAP_INLINE */ void pmap_kremove(vm_offset_t va);
+void *pmap_kenter_temporary(vm_paddr_t pa, int i);
+void pmap_kenter_temporary_free(vm_paddr_t pa);
+int pmap_compute_pages_to_dump(void);
+void pmap_update_page(pmap_t pmap, vm_offset_t va, pt_entry_t pte);
+
+/*
+ * floating virtual pages (FPAGES)
+ *
+ * These are the reserved virtual memory areas which can be
+ * mapped to any physical memory.
+ */
+#define	FPAGES			2
+#define	FPAGES_SHARED		2
+#define	FSPACE			((FPAGES * MAXCPU + FPAGES_SHARED)  * PAGE_SIZE)
+#define	PMAP_FPAGE1		0x00	/* Used by pmap_zero_page &
+					 * pmap_copy_page */
+#define	PMAP_FPAGE2		0x01	/* Used by pmap_copy_page */
+
+#define	PMAP_FPAGE3		0x00	/* Used by pmap_zero_page_idle */
+#define	PMAP_FPAGE_KENTER_TEMP	0x01	/* Used by coredump */
+
+struct fpage {
+	vm_offset_t kva;
+	u_int state;
+};
+
+struct sysmaps {
+	struct mtx lock;
+	struct fpage fp[FPAGES];
+};
+
+vm_offset_t 
+pmap_map_fpage(vm_paddr_t pa, struct fpage *fp,
+    boolean_t check_unmaped);
+void pmap_unmap_fpage(vm_paddr_t pa, struct fpage *fp);
+
+#endif				/* _KERNEL */
+
+#endif				/* !LOCORE */
+
+#endif				/* !_MACHINE_PMAP_H_ */