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Diffstat (limited to 'sys/i386/include/pmap.h')
| -rw-r--r-- | sys/i386/include/pmap.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h new file mode 100644 index 0000000..d90a4ba --- /dev/null +++ b/sys/i386/include/pmap.h @@ -0,0 +1,203 @@ +/* + * 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_ */ |
