initial import of NetBSD tree

1 files changed, 201 insertions, 0 deletions

diff --git a/sys/arch/i386/include/pmap.old.h b/sys/arch/i386/include/pmap.old.h
new file mode 100644
index 00000000000..0fda8d0b976
--- /dev/null
+++ b/sys/arch/i386/include/pmap.old.h
@@ -0,0 +1,201 @@
+/*	$NetBSD: pmap.h,v 1.21 1995/10/11 04:20:20 mycroft Exp $	*/
+
+/* 
+ * Copyright (c) 1995 Charles M. Hannum.  All rights reserved.
+ * 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.
+ * 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.
+ *
+ *	@(#)pmap.h	7.4 (Berkeley) 5/12/91
+ */
+
+/*
+ * 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
+ */
+
+#ifndef	_I386_PMAP_H_
+#define	_I386_PMAP_H_
+
+#include <machine/cpufunc.h>
+#include <machine/pte.h>
+
+/*
+ * 386 page table entry and page table directory
+ * W.Jolitz, 8/89
+ */
+
+/*
+ * One page directory, shared between
+ * kernel and user modes.
+ */
+#define	PTDPTDI		0x3df		/* ptd entry that points to ptd! */
+#define	KPTDI		0x3e0		/* start of kernel virtual pde's */
+#define	NKPDE		12
+#define	APTDPTDI	0x3ff		/* start of alternate page directory */
+
+/*
+ * Address of current and alternate address space page table maps
+ * and directories.
+ */
+#ifdef _KERNEL
+extern pt_entry_t	PTmap[], APTmap[], Upte;
+extern pd_entry_t	PTD[], APTD[], PTDpde, APTDpde, Upde;
+extern pt_entry_t	*Sysmap;
+
+extern int	PTDpaddr;	/* physical address of kernel PTD */
+
+void pmap_bootstrap __P((vm_offset_t start));
+boolean_t pmap_testbit __P((vm_offset_t, int));
+void pmap_changebit __P((vm_offset_t, int, int));
+__pure u_int pmap_page_index __P((vm_offset_t));
+#endif
+
+/*
+ * virtual address to page table entry and
+ * to physical address. Likewise for alternate address space.
+ * Note: these work recursively, thus vtopte of a pte will give
+ * the corresponding pde that in turn maps it.
+ */
+#define	vtopte(va)	(PTmap + i386_btop(va))
+#define	kvtopte(va)	vtopte(va)
+#define	ptetov(pt)	(i386_ptob(pt - PTmap)) 
+#define	vtophys(va) \
+	((*vtopte(va) & PG_FRAME) | ((unsigned)(va) & ~PG_FRAME))
+
+#define	avtopte(va)	(APTmap + i386_btop(va))
+#define	ptetoav(pt)	(i386_ptob(pt - APTmap)) 
+#define	avtophys(va) \
+	((*avtopte(va) & PG_FRAME) | ((unsigned)(va) & ~PG_FRAME))
+
+/*
+ * macros to generate page directory/table indicies
+ */
+#define	pdei(va)	(((va) & PD_MASK) >> PDSHIFT)
+#define	ptei(va)	(((va) & PT_MASK) >> PGSHIFT)
+
+/*
+ * Pmap stuff
+ */
+typedef struct pmap {
+	pd_entry_t		*pm_pdir;	/* KVA of page directory */
+	boolean_t		pm_pdchanged;	/* pdir changed */
+	short			pm_dref;	/* page directory ref count */
+	short			pm_count;	/* pmap reference count */
+	simple_lock_data_t	pm_lock;	/* lock on pmap */
+	struct pmap_statistics	pm_stats;	/* pmap statistics */
+	long			pm_ptpages;	/* more stats: PT pages */
+} *pmap_t;
+
+/*
+ * For each vm_page_t, there is a list of all currently valid virtual
+ * mappings of that page.  An entry is a pv_entry, the list is pv_table.
+ */
+struct pv_entry {
+	struct pv_entry	*pv_next;	/* next pv_entry */
+	pmap_t		pv_pmap;	/* pmap where mapping lies */
+	vm_offset_t	pv_va;		/* virtual address for mapping */
+};
+
+struct pv_page;
+
+struct pv_page_info {
+	TAILQ_ENTRY(pv_page) pgi_list;
+	struct pv_entry *pgi_freelist;
+	int pgi_nfree;
+};
+
+/*
+ * This is basically:
+ * ((NBPG - sizeof(struct pv_page_info)) / sizeof(struct pv_entry))
+ */
+#define	NPVPPG	340
+
+struct pv_page {
+	struct pv_page_info pvp_pgi;
+	struct pv_entry pvp_pv[NPVPPG];
+};
+
+#ifdef	_KERNEL
+extern struct pmap	kernel_pmap_store;
+struct pv_entry		*pv_table;	/* array of entries, one per page */
+
+#define	pmap_kernel()			(&kernel_pmap_store)
+#define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
+#define	pmap_update()			tlbflush()
+
+static __inline void
+pmap_clear_modify(vm_offset_t pa)
+{
+	pmap_changebit(pa, 0, ~PG_M);
+}
+
+static __inline void
+pmap_clear_reference(vm_offset_t pa)
+{
+	pmap_changebit(pa, 0, ~PG_U);
+}
+
+static __inline void
+pmap_copy_on_write(vm_offset_t pa)
+{
+	pmap_changebit(pa, PG_RO, ~PG_RW);
+}
+
+static __inline boolean_t
+pmap_is_modified(vm_offset_t pa)
+{
+	return pmap_testbit(pa, PG_M);
+}
+
+static __inline boolean_t
+pmap_is_referenced(vm_offset_t pa)
+{
+	return pmap_testbit(pa, PG_U);
+}
+
+static __inline vm_offset_t
+pmap_phys_address(int ppn)
+{
+	return i386_ptob(ppn);
+}
+
+#endif	/* _KERNEL */
+
+#endif /* _I386_PMAP_H_ */