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pc: modify cpu0 page tables in patwc() instead of current cpu ones

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on 386 kernel, each processor has its own pdb where the primary
pdb for kernel mappings is on cpu0 and other cpu's lazily pull
pdb entries from cpu0 when they fault in vmapsync().

so we have to edit the table tables in the pdb of cpu0 and not
the current processor.
This commit is contained in:
cinap_lenrek 2016-12-17 19:47:35 +01:00
parent ea30cf94a5
commit 2830cd7eb6
1 changed files with 2 additions and 2 deletions
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4
sys/src/9/pc/mmu.c
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@ -1097,12 +1097,12 @@ patwc(void *a, int n)
/* set the bits for all pages in range */
for(va = (ulong)a; n > 0; n -= z, va += z){
pte = mmuwalk(m->pdb, va, 1, 0);
pte = mmuwalk(MACHP(0)->pdb, va, 1, 0);
if(pte && (*pte & (PTEVALID|PTESIZE)) == (PTEVALID|PTESIZE)){
z = 4*MB - (va & (4*MB-1));
mask = 3<<3 | 1<<12;
} else {
pte = mmuwalk(m->pdb, va, 2, 0);
pte = mmuwalk(MACHP(0)->pdb, va, 2, 0);
if(pte == 0 || (*pte & PTEVALID) == 0)
panic("patwc: va=%#p", va);
z = BY2PG - (va & (BY2PG-1));