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kernel: ignore memory pages with singular kernel addresses

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addresses va's of 0 and -BY2PG cause trouble with some memmove()/memset()
implementations and possibly other code because of the nil pointer
and end pointers wrapping to zero.
This commit is contained in:
cinap_lenrek 2015-06-18 12:15:33 +02:00
parent fd8597ac31
commit 0dab8869ad
1 changed files with 2 additions and 0 deletions
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2
sys/src/9/port/page.c
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@ -36,6 +36,8 @@ pageinit(void)
for(j=0; j<pm->npage; j++){
memset(p, 0, sizeof *p);
p->pa = pm->base+j*BY2PG;
if(cankaddr(p->pa) && (KADDR(p->pa) == nil || KADDR(p->pa) == (void*)-BY2PG))
continue;
p->color = color;
color = (color+1)%NCOLOR;
pagechainhead(p);