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Don't invalidate the TLB in pmap_qenter() unless the old mapping was valid.

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Most often, it isn't.

Reviewed by: tegge@
This commit is contained in:
Alan Cox 2006-06-12 20:05:27 +00:00
parent ed0b0e826e
commit b74a62d602
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=159546
2 changed files with 26 additions and 16 deletions
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21
sys/amd64/amd64/pmap.c
View File

@ -1006,17 +1006,22 @@ pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot)
* Note: SMP coherent. Uses a ranged shootdown IPI.
*/
void
pmap_qenter(vm_offset_t sva, vm_page_t *m, int count)
pmap_qenter(vm_offset_t sva, vm_page_t *ma, int count)
{
vm_offset_t va;
pt_entry_t *endpte, oldpte, *pte;
va = sva;
while (count-- > 0) {
pmap_kenter(va, VM_PAGE_TO_PHYS(*m));
va += PAGE_SIZE;
m++;
oldpte = 0;
pte = vtopte(sva);
endpte = pte + count;
while (pte < endpte) {
oldpte |= *pte;
pte_store(pte, VM_PAGE_TO_PHYS(*ma) | PG_G | PG_RW | PG_V);
pte++;
ma++;
}
pmap_invalidate_range(kernel_pmap, sva, va);
if ((oldpte & PG_V) != 0)
pmap_invalidate_range(kernel_pmap, sva, sva + count *
PAGE_SIZE);
}
/*

21
sys/i386/i386/pmap.c
View File

@ -1057,17 +1057,22 @@ pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot)
* Note: SMP coherent. Uses a ranged shootdown IPI.
*/
void
pmap_qenter(vm_offset_t sva, vm_page_t *m, int count)
pmap_qenter(vm_offset_t sva, vm_page_t *ma, int count)
{
vm_offset_t va;
pt_entry_t *endpte, oldpte, *pte;
va = sva;
while (count-- > 0) {
pmap_kenter(va, VM_PAGE_TO_PHYS(*m));
va += PAGE_SIZE;
m++;
oldpte = 0;
pte = vtopte(sva);
endpte = pte + count;
while (pte < endpte) {
oldpte |= *pte;
pte_store(pte, VM_PAGE_TO_PHYS(*ma) | pgeflag | PG_RW | PG_V);
pte++;
ma++;
}
pmap_invalidate_range(kernel_pmap, sva, va);
if ((oldpte & PG_V) != 0)
pmap_invalidate_range(kernel_pmap, sva, sva + count *
PAGE_SIZE);
}
/*