204 lines
6.8 KiB
C
204 lines
6.8 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 1.15 1994/08/18 22:34:47 wollman Exp $
|
|
*/
|
|
|
|
#ifndef _PMAP_MACHINE_
|
|
#define _PMAP_MACHINE_ 1
|
|
|
|
#include <machine/pte.h>
|
|
|
|
typedef unsigned int *pd_entry_t;
|
|
typedef unsigned int *pt_entry_t;
|
|
|
|
/*
|
|
* NKPDE controls the virtual space of the kernel, what ever is left, minus
|
|
* the alternate page table area is given to the user (NUPDE)
|
|
*/
|
|
/*
|
|
* NKPDE controls the virtual space of the kernel, what ever is left is
|
|
* given to the user (NUPDE)
|
|
*/
|
|
#ifndef NKPT
|
|
#define NKPT 24 /* actual number of kernel page tables */
|
|
#endif
|
|
#ifndef NKPDE
|
|
#define NKPDE 63 /* addressable number of page tables/pde's */
|
|
#endif
|
|
|
|
#define NUPDE (NPTEPG-NKPDE) /* number of user pde's */
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
#define APTDPTDI (NPTEPG-1) /* alt ptd entry that points to APTD */
|
|
#define KPTDI (APTDPTDI-NKPDE)/* start of kernel virtual pde's */
|
|
#define PTDPTDI (KPTDI-1) /* ptd entry that points to ptd! */
|
|
#define KSTKPTDI (PTDPTDI-1) /* ptd entry for u./kernel&user stack */
|
|
#define KSTKPTEOFF (NBPG/sizeof(pd_entry_t)-UPAGES) /* pte entry for kernel stack */
|
|
|
|
#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 kvtopte(va) vtopte(va)
|
|
#define ptetov(pt) (i386_ptob(pt - PTmap))
|
|
#define vtophys(va) (((int) (*vtopte(va))&PG_FRAME) | ((int)(va) & PGOFSET))
|
|
#define ispt(va) ((va) >= UPT_MIN_ADDRESS && (va) <= KPT_MAX_ADDRESS)
|
|
|
|
#define avtopte(va) (APTmap + i386_btop(va))
|
|
#define ptetoav(pt) (i386_ptob(pt - APTmap))
|
|
#define avtophys(va) (((int) (*avtopte(va))&PG_FRAME) | ((int)(va) & PGOFSET))
|
|
|
|
#ifdef KERNEL
|
|
/*
|
|
* Routine: pmap_kextract
|
|
* Function:
|
|
* Extract the physical page address associated
|
|
* kernel virtual address.
|
|
*/
|
|
static inline vm_offset_t
|
|
pmap_kextract(va)
|
|
vm_offset_t va;
|
|
{
|
|
vm_offset_t pa = *(int *)vtopte(va);
|
|
pa = (pa & PG_FRAME) | (va & ~PG_FRAME);
|
|
return pa;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* macros to generate page directory/table indicies
|
|
*/
|
|
|
|
#define pdei(va) (((va)&PD_MASK)>>PD_SHIFT)
|
|
#define ptei(va) (((va)&PT_MASK)>>PG_SHIFT)
|
|
|
|
/*
|
|
* Pmap stuff
|
|
*/
|
|
|
|
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 */
|
|
};
|
|
|
|
typedef struct pmap *pmap_t;
|
|
|
|
#ifdef KERNEL
|
|
extern pmap_t kernel_pmap;
|
|
#endif
|
|
|
|
/*
|
|
* Macros for speed
|
|
*/
|
|
#define PMAP_ACTIVATE(pmapp, pcbp) \
|
|
if ((pmapp) != NULL /*&& (pmapp)->pm_pdchanged */) { \
|
|
(pcbp)->pcb_cr3 = \
|
|
pmap_extract(kernel_pmap, (vm_offset_t)(pmapp)->pm_pdir); \
|
|
if ((pmapp) == &curproc->p_vmspace->vm_pmap) \
|
|
load_cr3((pcbp)->pcb_cr3); \
|
|
(pmapp)->pm_pdchanged = FALSE; \
|
|
}
|
|
|
|
#define PMAP_DEACTIVATE(pmapp, pcbp)
|
|
|
|
/*
|
|
* 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 {
|
|
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 */
|
|
} *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
|
|
|
|
pv_entry_t pv_table; /* array of entries, one per page */
|
|
|
|
#define pa_index(pa) atop(pa - vm_first_phys)
|
|
#define pa_to_pvh(pa) (&pv_table[pa_index(pa)])
|
|
|
|
#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
|
|
|
|
extern inline pt_entry_t *pmap_pte(pmap_t, vm_offset_t);
|
|
struct pcb; extern void pmap_activate(pmap_t, struct pcb *);
|
|
extern pmap_t pmap_kernel(void);
|
|
|
|
#endif /* KERNEL */
|
|
|
|
#endif /* _PMAP_MACHINE_ */
|