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- Clear the page's PG_WRITEABLE flag in the i386's pmap_changebit()

Browse Source 
if we're removing write access from the page's PTEs.
 - Export pmap_remove_all() on alpha, i386, and ia64.  (It's already
   exported on sparc64.)
This commit is contained in:
Alan Cox 2002-11-11 05:17:34 +00:00
parent cd5a1c3b76
commit 6372d61e3e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=106753
6 changed files with 13 additions and 12 deletions
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3
sys/alpha/alpha/pmap.c
View File

@ -330,7 +330,6 @@ static pv_entry_t get_pv_entry(void);
static void alpha_protection_init(void);
static void pmap_changebit(vm_page_t m, int bit, boolean_t setem);
static void pmap_remove_all(vm_page_t m);
static vm_page_t pmap_enter_quick(pmap_t pmap, vm_offset_t va,
vm_page_t m, vm_page_t mpte);
static int pmap_remove_pte(pmap_t pmap, pt_entry_t* ptq, vm_offset_t sva);
@ -1933,7 +1932,7 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
* pmap_remove (slow...)
*/
static void
void
pmap_remove_all(vm_page_t m)
{
register pv_entry_t pv;

8
sys/amd64/amd64/pmap.c
View File

@ -203,7 +203,6 @@ static pv_entry_t get_pv_entry(void);
static void i386_protection_init(void);
static __inline void pmap_changebit(vm_page_t m, int bit, boolean_t setem);
static void pmap_remove_all(vm_page_t m);
static vm_page_t pmap_enter_quick(pmap_t pmap, vm_offset_t va,
vm_page_t m, vm_page_t mpte);
static int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t sva);
@ -1893,7 +1892,7 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
* pmap_remove (slow...)
*/
static void
void
pmap_remove_all(vm_page_t m)
{
register pv_entry_t pv;
@ -3067,7 +3066,8 @@ pmap_changebit(vm_page_t m, int bit, boolean_t setem)
register pt_entry_t *pte;
int s;
if (!pmap_initialized || (m->flags & PG_FICTITIOUS))
if (!pmap_initialized || (m->flags & PG_FICTITIOUS) ||
(!setem && bit == PG_RW && (m->flags & PG_WRITEABLE) == 0))
return;
s = splvm();
@ -3112,6 +3112,8 @@ pmap_changebit(vm_page_t m, int bit, boolean_t setem)
}
}
}
if (!setem && bit == PG_RW)
vm_page_flag_clear(m, PG_WRITEABLE);
splx(s);
}

8
sys/i386/i386/pmap.c
View File

@ -203,7 +203,6 @@ static pv_entry_t get_pv_entry(void);
static void i386_protection_init(void);
static __inline void pmap_changebit(vm_page_t m, int bit, boolean_t setem);
static void pmap_remove_all(vm_page_t m);
static vm_page_t pmap_enter_quick(pmap_t pmap, vm_offset_t va,
vm_page_t m, vm_page_t mpte);
static int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t sva);
@ -1893,7 +1892,7 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
* pmap_remove (slow...)
*/
static void
void
pmap_remove_all(vm_page_t m)
{
register pv_entry_t pv;
@ -3067,7 +3066,8 @@ pmap_changebit(vm_page_t m, int bit, boolean_t setem)
register pt_entry_t *pte;
int s;
if (!pmap_initialized || (m->flags & PG_FICTITIOUS))
if (!pmap_initialized || (m->flags & PG_FICTITIOUS) ||
(!setem && bit == PG_RW && (m->flags & PG_WRITEABLE) == 0))
return;
s = splvm();
@ -3112,6 +3112,8 @@ pmap_changebit(vm_page_t m, int bit, boolean_t setem)
}
}
}
if (!setem && bit == PG_RW)
vm_page_flag_clear(m, PG_WRITEABLE);
splx(s);
}

3
sys/ia64/ia64/pmap.c
View File

@ -257,7 +257,6 @@ static pv_entry_t get_pv_entry(void);
static void ia64_protection_init(void);
static void pmap_invalidate_all(pmap_t pmap);
static void pmap_remove_all(vm_page_t m);
static void pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m);
vm_offset_t
@ -1537,7 +1536,7 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
* pmap_remove (slow...)
*/
static void
void
pmap_remove_all(vm_page_t m)
{
pmap_t oldpmap;

2
sys/sparc64/include/pmap.h
View File

@ -92,8 +92,6 @@ int pmap_protect_tte(struct pmap *pm1, struct pmap *pm2, struct tte *tp,
void pmap_map_tsb(void);
void pmap_remove_all(vm_page_t m);
void pmap_clear_write(vm_page_t m);
#define vtophys(va) pmap_kextract(((vm_offset_t)(va)))

1
sys/vm/pmap.h
View File

@ -122,6 +122,7 @@ void pmap_qenter(vm_offset_t, vm_page_t *, int);
void pmap_qremove(vm_offset_t, int);
void pmap_release(pmap_t);
void pmap_remove(pmap_t, vm_offset_t, vm_offset_t);
void pmap_remove_all(vm_page_t m);
void pmap_remove_pages(pmap_t, vm_offset_t, vm_offset_t);
void pmap_zero_page(vm_page_t);
void pmap_zero_page_area(vm_page_t, int off, int size);