mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
477a642cee
There are various options documented in i386/conf/LINT, there is more to come over the next few days. The kernel should run pretty much "as before" without the options to activate SMP mode. There are a handful of known "loose ends" that need to be fixed, but have been put off since the SMP kernel is in a moderately good condition at the moment. This commit is the result of the tinkering and testing over the last 14 months by many people. A special thanks to Steve Passe for implementing the APIC code!
246 lines
8.1 KiB
C
246 lines
8.1 KiB
C
/*
|
|
* 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
|
|
* $Id: pmap.h,v 1.49 1997/04/07 09:30:20 peter Exp $
|
|
*/
|
|
|
|
#ifndef _MACHINE_PMAP_H_
|
|
#define _MACHINE_PMAP_H_
|
|
|
|
/*
|
|
* Page-directory and page-table entires follow this format, with a few
|
|
* of the fields not present here and there, depending on a lot of things.
|
|
*/
|
|
/* ---- Intel Nomenclature ---- */
|
|
#define PG_V 0x001 /* P Valid */
|
|
#define PG_RW 0x002 /* R/W Read/Write */
|
|
#define PG_U 0x004 /* U/S User/Supervisor */
|
|
#define PG_NC_PWT 0x008 /* PWT Write through */
|
|
#define PG_NC_PCD 0x010 /* PCD Cache disable */
|
|
#define PG_A 0x020 /* A Accessed */
|
|
#define PG_M 0x040 /* D Dirty */
|
|
#define PG_PS 0x080 /* PS Page size (0=4k,1=4M) */
|
|
#define PG_G 0x100 /* G Global */
|
|
#define PG_AVAIL1 0x200 /* / Available for system */
|
|
#define PG_AVAIL2 0x400 /* < programmers use */
|
|
#define PG_AVAIL3 0x800 /* \ */
|
|
|
|
|
|
/* Our various interpretations of the above */
|
|
#define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
|
|
#define PG_MANAGED PG_AVAIL2
|
|
#define PG_FRAME (~PAGE_MASK)
|
|
#define PG_PROT (PG_RW|PG_U) /* all protection bits . */
|
|
#define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
|
|
|
|
/*
|
|
* Page Protection Exception bits
|
|
*/
|
|
|
|
#define PGEX_P 0x01 /* Protection violation vs. not present */
|
|
#define PGEX_W 0x02 /* during a Write cycle */
|
|
#define PGEX_U 0x04 /* access from User mode (UPL) */
|
|
|
|
/*
|
|
* Pte related macros
|
|
*/
|
|
#define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
|
|
|
|
#ifndef NKPT
|
|
#define NKPT 9 /* actual number of kernel page tables */
|
|
#endif
|
|
#ifndef NKPDE
|
|
#if defined(SMP) && defined(SMP_PRIVPAGES)
|
|
#define NKPDE 62 /* addressable number of page tables/pde's */
|
|
#else /* SMP && SMP_PRIVPAGES */
|
|
#define NKPDE 63 /* addressable number of page tables/pde's */
|
|
#endif /* SMP && SMP_PRIVPAGES */
|
|
#endif
|
|
|
|
/*
|
|
* 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 APTDPTDI (NPDEPG-1) /* alt ptd entry that points to APTD */
|
|
#if defined(SMP) && defined(SMP_PRIVPAGES)
|
|
#define MPPTDI (APTDPTDI-1) /* per cpu ptd entry */
|
|
#define KPTDI (MPPTDI-NKPDE) /* start of kernel virtual pde's */
|
|
#else /* SMP && SMP_PRIVPAGES */
|
|
#define KPTDI (APTDPTDI-NKPDE)/* start of kernel virtual pde's */
|
|
#endif /* SMP && SMP_PRIVPAGES */
|
|
#define PTDPTDI (KPTDI-1) /* ptd entry that points to ptd! */
|
|
#define UMAXPTDI (PTDPTDI-1) /* ptd entry for user space end */
|
|
#define UMAXPTEOFF (NPTEPG-UPAGES_HOLE) /* pte entry for user space end */
|
|
|
|
/*
|
|
* XXX doesn't really belong here I guess...
|
|
*/
|
|
#define ISA_HOLE_START 0xa0000
|
|
#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
|
|
|
|
#ifndef LOCORE
|
|
|
|
#include <sys/queue.h>
|
|
|
|
typedef unsigned int *pd_entry_t;
|
|
typedef unsigned int *pt_entry_t;
|
|
|
|
#define PDESIZE sizeof(pd_entry_t) /* for assembly files */
|
|
#define PTESIZE sizeof(pt_entry_t) /* for assembly files */
|
|
|
|
/*
|
|
* 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 int IdlePTD; /* physical address of "Idle" state directory */
|
|
#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 vtophys(va) (((int) (*vtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
|
|
|
|
#define avtopte(va) (APTmap + i386_btop(va))
|
|
#define avtophys(va) (((int) (*avtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
|
|
|
|
#ifdef KERNEL
|
|
/*
|
|
* 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 = *(int *)vtopte(va);
|
|
pa = (pa & PG_FRAME) | (va & PAGE_MASK);
|
|
return pa;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Pmap stuff
|
|
*/
|
|
struct pv_entry;
|
|
typedef struct {
|
|
int pv_list_count;
|
|
struct vm_page *pv_vm_page;
|
|
TAILQ_HEAD(,pv_entry) pv_list;
|
|
} pv_table_t;
|
|
|
|
struct pmap {
|
|
pd_entry_t *pm_pdir; /* KVA of page directory */
|
|
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;
|
|
#if PMAP_PVLIST
|
|
TAILQ_ENTRY(pv_entry) pv_plist;
|
|
#endif
|
|
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 phys_avail[];
|
|
extern vm_offset_t virtual_avail;
|
|
extern vm_offset_t virtual_end;
|
|
|
|
void pmap_bootstrap __P(( vm_offset_t, vm_offset_t));
|
|
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));
|
|
|
|
#endif /* KERNEL */
|
|
|
|
#endif /* !LOCORE */
|
|
|
|
#endif /* !_MACHINE_PMAP_H_ */
|