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freebsd-dev/sys/alpha/include/pmap.h
Doug Rabson 897cd717a5 Add initial support for the FreeBSD/alpha kernel. This is very much a 
work in progress and has never booted a real machine.  Initial
development and testing was done using SimOS (see
http://simos.stanford.edu for details).  On the SimOS simulator, this
port successfully reaches single-user mode and has been tested with
loads as high as one copy of /bin/ls :-).

Obtained from: partly from NetBSD/alpha
1998-06-10 10:57:29 +00:00

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7.4 KiB
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/*
* 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.
*
* 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: i386 pmap.h,v 1.54 1997/11/20 19:30:35 bde Exp
* $Id$
*/
#ifndef _MACHINE_PMAP_H_
#define _MACHINE_PMAP_H_
/*
* Define meanings for a few software bits in the pte
*/
#define PG_V ALPHA_PTE_VALID
#define PG_FOR ALPHA_PTE_FAULT_ON_READ
#define PG_FOW ALPHA_PTE_FAULT_ON_WRITE
#define PG_FOE ALPHA_PTE_FAULT_ON_EXECUTE
#define PG_ASM ALPHA_PTE_ASM
#define PG_GH ALPHA_PTE_GRANULARITY
#define PG_KRE ALPHA_PTE_KR
#define PG_URE ALPHA_PTE_UR
#define PG_KWE ALPHA_PTE_KW
#define PG_UWE ALPHA_PTE_UW
#define PG_PROT ALPHA_PTE_PROT
#define PG_SHIFT 32
#define PG_W 0x00010000 /* software wired */
#define PG_MANAGED 0x00020000 /* software managed */
/*
* Pte related macros
*/
#define VADDR(l1, l2, l3) (((l1) << ALPHA_L1SHIFT) \
+ ((l2) << ALPHA_L2SHIFT) \
+ ((l3) << ALPHA_L3SHIFT)
#ifndef NKPT
#define NKPT 9 /* initial number of kernel page tables */
#endif
#define NKLEV2MAPS 255 /* max number of lev2 page tables */
#define NKLEV3MAPS (NKLEV2MAPS << ALPHA_PTSHIFT) /* max number of lev3 page tables */
/*
* The *PTDI values control the layout of virtual memory
*
* XXX This works for now, but I am not real happy with it, I'll fix it
* right after I fix locore.s and the magic 28K hole
*
* SMP_PRIVPAGES: The per-cpu address space is 0xff80000 -> 0xffbfffff
*/
#define PTLEV1I (NPTEPG-1) /* Lev0 entry that points to Lev0 */
#define K0SEGLEV1I (NPTEPG/2)
#define K1SEGLEV1I (K0SEGLEV1I+(NPTEPG/4))
#define NUSERLEV2MAPS (NPTEPG/2)
#define NUSERLEV3MAPS (NUSERLEV2MAPS << ALPHA_PTSHIFT)
#ifndef LOCORE
#include <sys/queue.h>
typedef alpha_pt_entry_t pt_entry_t;
#define PTESIZE sizeof(pt_entry_t) /* for assembly files */
/*
* Address of current address space page table maps
*/
#ifdef KERNEL
extern pt_entry_t PTmap[]; /* lev3 page tables */
extern pt_entry_t PTlev2[]; /* lev2 page tables */
extern pt_entry_t PTlev1[]; /* lev1 page table */
extern pt_entry_t PTlev1pte; /* pte that maps lev1 page table */
#endif
#ifdef KERNEL
/*
* virtual address to page table entry and
* to physical address.
* Note: this work recursively, thus vtopte of a pte will give
* the corresponding lev1 that in turn maps it.
*/
#define vtopte(va) (PTmap + (alpha_btop(va) \
& ((1 << 3*ALPHA_PTSHIFT)-1)))
/*
* Routine: pmap_kextract
* Function:
* Extract the physical page address associated
* kernel virtual address.
*/
static __inline vm_offset_t
pmap_kextract(vm_offset_t va)
{
vm_offset_t pa;
if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END)
pa = ALPHA_K0SEG_TO_PHYS(va);
else
pa = alpha_ptob(ALPHA_PTE_TO_PFN(*vtopte(va)))
| (va & PAGE_MASK);
return pa;
}
#define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
#endif /* KERNEL */
/*
* Pmap stuff
*/
struct pv_entry;
typedef struct {
int pv_list_count;
struct vm_page *pv_vm_page;
int pv_flags;
TAILQ_HEAD(,pv_entry) pv_list;
} pv_table_t;
#define PV_TABLE_MOD 0x01 /* modified */
#define PV_TABLE_REF 0x02 /* referenced */
struct pmap {
pt_entry_t *pm_lev1; /* KVA of lev0map */
vm_object_t pm_pteobj; /* Container for pte's */
TAILQ_HEAD(,pv_entry) pm_pvlist; /* list of mappings in pmap */
int pm_count; /* reference count */
int pm_flags; /* pmap flags */
struct pmap_statistics pm_stats; /* pmap statistics */
struct vm_page *pm_ptphint; /* pmap ptp hint */
};
#define pmap_resident_count(pmap) (pmap)->pm_stats.resident_count
#define PM_FLAG_LOCKED 0x1
#define PM_FLAG_WANTED 0x2
typedef struct pmap *pmap_t;
#ifdef KERNEL
extern pmap_t kernel_pmap;
#endif
/*
* 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 */
} *pv_entry_t;
#define PV_ENTRY_NULL ((pv_entry_t) 0)
#define PV_CI 0x01 /* all entries must be cache inhibited */
#define PV_PTPAGE 0x02 /* entry maps a page table page */
#ifdef KERNEL
extern caddr_t CADDR1;
extern pt_entry_t *CMAP1;
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;
vm_offset_t pmap_steal_memory __P((vm_size_t));
void pmap_bootstrap __P((vm_offset_t, u_int));
void pmap_setdevram __P((unsigned long long basea, vm_offset_t sizea));
int pmap_uses_prom_console __P((void));
pmap_t pmap_kernel __P((void));
void *pmap_mapdev __P((vm_offset_t, vm_size_t));
unsigned *pmap_pte __P((pmap_t, vm_offset_t)) __pure2;
vm_page_t pmap_use_pt __P((pmap_t, vm_offset_t));
void pmap_set_opt __P((unsigned *));
void pmap_set_opt_bsp __P((void));
void pmap_deactivate __P((struct proc *p));
void pmap_emulate_reference __P((struct proc *p, vm_offset_t v, int user, int write));
#endif /* KERNEL */
#endif /* !LOCORE */
#endif /* !_MACHINE_PMAP_H_ */
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