diff options
Diffstat (limited to 'sys/i386/include/pmap.h')
| -rw-r--r-- | sys/i386/include/pmap.h | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/sys/i386/include/pmap.h b/sys/i386/include/pmap.h index b83628a..190b8dd 100644 --- a/sys/i386/include/pmap.h +++ b/sys/i386/include/pmap.h @@ -42,7 +42,7 @@ * * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91 - * $Id: pmap.h,v 1.18 1994/11/14 14:12:24 bde Exp $ + * $Id: pmap.h,v 1.19 1994/12/18 03:11:46 davidg Exp $ */ #ifndef _MACHINE_PMAP_H_ @@ -62,7 +62,11 @@ typedef unsigned int *pt_entry_t; * given to the user (NUPDE) */ #ifndef NKPT +#if 0 #define NKPT 26 /* actual number of kernel page tables */ +#else +#define NKPT 9 /* actual number of kernel page tables */ +#endif #endif #ifndef NKPDE #define NKPDE 63 /* addressable number of page tables/pde's */ @@ -126,6 +130,43 @@ pmap_kextract(vm_offset_t va) pa = (pa & PG_FRAME) | (va & ~PG_FRAME); return pa; } + +/* + * pmap_is_referenced: + * + * Return whether or not the specified physical page was referenced + * by any physical maps. + */ +#define pmap_is_referenced(pa) pmap_testbit((pa), PG_U) + +/* + * pmap_is_modified: + * + * Return whether or not the specified physical page was modified + * in any physical maps. + */ +#define pmap_is_modified(pa) pmap_testbit((pa), PG_M) + +/* + * Clear the modify bits on the specified physical page. + */ +#define pmap_clear_modify(pa) pmap_changebit((pa), PG_M, FALSE) + +/* + * pmap_clear_reference: + * + * Clear the reference bit on the specified physical page. + */ +#define pmap_clear_reference(pa) pmap_changebit((pa), PG_U, FALSE) + +/* + * Routine: pmap_copy_on_write + * Function: + * Remove write privileges from all + * physical maps for this physical page. + */ +#define pmap_copy_on_write(pa) pmap_changebit((pa), PG_RW, FALSE) + #endif /* @@ -196,6 +237,7 @@ pv_entry_t pv_table; /* array of entries, one per page */ struct pcb; void pmap_activate __P((pmap_t, struct pcb *)); +void pmap_changebit __P((vm_offset_t, int, boolean_t)); pmap_t pmap_kernel __P((void)); boolean_t pmap_page_exists __P((pmap_t, vm_offset_t)); pt_entry_t *pmap_pte(pmap_t, vm_offset_t); |
