Imbus/xv6-riscv-kernel
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Simplify allocuvm/deallocuvm to operate in a contiguous memory model. This makes their interface match up better with proc->sz and also simplifies the callers (it even gets the main body of exec on one page).

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This commit is contained in:
Austin Clements 2010-09-02 18:28:36 -04:00
parent d49d31381d
commit 79cd8b3eed
4 changed files with 44 additions and 51 deletions
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7
proc.c
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@ -142,14 +142,15 @@ userinit(void)
int
growproc(int n)
{
uint sz = proc->sz;
if(n > 0){
if(!allocuvm(proc->pgdir, (char *)proc->sz, n))
if(!(sz = allocuvm(proc->pgdir, sz, sz + n)))
return -1;
} else if(n < 0){
if(!deallocuvm(proc->pgdir, (char *)(proc->sz + n), 0 - n))
if(!(sz = deallocuvm(proc->pgdir, sz, sz + n)))
return -1;
}
proc->sz += n;
proc->sz = sz;
switchuvm(proc);
return 0;
}