sanchayanmaity/xv6-cs450
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

Tiny bit of cleanup

Browse source
This commit is contained in:
Frans Kaashoek 2011-08-09 21:56:43 -04:00
parent 22c73411ca
commit 8a9933a200
1 changed files with 7 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
vm.c
View file

@ -43,7 +43,7 @@ seginit(void)
// that corresponds to linear address va. If create!=0,
// create any required page table pages.
static pte_t *
walkpgdir(pde_t *pgdir, const void *va, int create, char* (*alloc)(void))
walkpgdir(pde_t *pgdir, const void *va, char* (*alloc)(void))
{
pde_t *pde;
pte_t *pgtab;
@ -52,7 +52,7 @@ walkpgdir(pde_t *pgdir, const void *va, int create, char* (*alloc)(void))
if(*pde & PTE_P){
pgtab = (pte_t*)p2v(PTE_ADDR(*pde));
} else {
if(!create || (pgtab = (pte_t*)alloc()) == 0)
if(!alloc || (pgtab = (pte_t*)alloc()) == 0)
return 0;
// Make sure all those PTE_P bits are zero.
memset(pgtab, 0, PGSIZE);
@ -76,7 +76,7 @@ mappages(pde_t *pgdir, void *la, uint size, uint pa, int perm, char* (*alloc)(vo
a = PGROUNDDOWN(la);
last = PGROUNDDOWN(la + size - 1);
for(;;){
pte = walkpgdir(pgdir, a, 1, alloc);
pte = walkpgdir(pgdir, a, alloc);
if(pte == 0)
return -1;
if(*pte & PTE_P)
@ -222,7 +222,7 @@ loaduvm(pde_t *pgdir, char *addr, struct inode *ip, uint offset, uint sz)
if((uint)addr % PGSIZE != 0)
panic("loaduvm: addr must be page aligned");
for(i = 0; i < sz; i += PGSIZE){
if((pte = walkpgdir(pgdir, addr+i, 0, kalloc)) == 0)
if((pte = walkpgdir(pgdir, addr+i, 0)) == 0)
panic("loaduvm: address should exist");
pa = PTE_ADDR(*pte);
if(sz - i < PGSIZE)
@ -277,7 +277,7 @@ deallocuvm(pde_t *pgdir, uint oldsz, uint newsz)
a = PGROUNDUP(newsz);
for(; a < oldsz; a += PGSIZE){
pte = walkpgdir(pgdir, (char*)a, 0, kalloc);
pte = walkpgdir(pgdir, (char*)a, 0);
if(pte && (*pte & PTE_P) != 0){
pa = PTE_ADDR(*pte);
if(pa == 0)
@ -322,7 +322,7 @@ copyuvm(pde_t *pgdir, uint sz)
if((d = setupkvm(kalloc)) == 0)
return 0;
for(i = 0; i < sz; i += PGSIZE){
if((pte = walkpgdir(pgdir, (void*)i, 0, kalloc)) == 0)
if((pte = walkpgdir(pgdir, (void*)i, 0)) == 0)
panic("copyuvm: pte should exist");
if(!(*pte & PTE_P))
panic("copyuvm: page not present");
@ -347,7 +347,7 @@ uva2ka(pde_t *pgdir, char *uva)
{
pte_t *pte;
pte = walkpgdir(pgdir, uva, 0, kalloc);
pte = walkpgdir(pgdir, uva, 0);
if((*pte & PTE_P) == 0)
return 0;
if((*pte & PTE_U) == 0)