sanchayanmaity/xv6-cs450
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more trivial cleanup

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This commit is contained in:
Russ Cox 2011-01-11 13:51:40 -05:00
parent 89bfdd4db1
commit 417c37115e
3 changed files with 13 additions and 16 deletions
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6
defs.h
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@ -161,11 +161,11 @@ int allocuvm(pde_t*, uint, uint);
int deallocuvm(pde_t*, uint, uint); int deallocuvm(pde_t*, uint, uint);
void freevm(pde_t*); void freevm(pde_t*);
void inituvm(pde_t*, char*, uint); void inituvm(pde_t*, char*, uint);
int loaduvm(pde_t*, char*, struct inode *, uint, uint); int loaduvm(pde_t*, char*, struct inode*, uint, uint);
pde_t* copyuvm(pde_t*,uint); pde_t* copyuvm(pde_t*, uint);
void switchuvm(struct proc*); void switchuvm(struct proc*);
void switchkvm(void); void switchkvm(void);
int copyout(pde_t *pgdir, uint va, void *buf, uint len); int copyout(pde_t*, uint, void*, uint);
// number of elements in fixed-size array // number of elements in fixed-size array
#define NELEM(x) (sizeof(x)/sizeof((x)[0])) #define NELEM(x) (sizeof(x)/sizeof((x)[0]))

2
kalloc.c
View file

@ -27,7 +27,7 @@ kinit(void)
initlock(&kmem.lock, "kmem"); initlock(&kmem.lock, "kmem");
p = (char*)PGROUNDUP((uint)end); p = (char*)PGROUNDUP((uint)end);
for(; p + PGSIZE - 1 < (char*)PHYSTOP; p += PGSIZE) for(; p + PGSIZE <= (char*)PHYSTOP; p += PGSIZE)
kfree(p); kfree(p);
} }

21
vm.c
View file

@ -250,16 +250,16 @@ loaduvm(pde_t *pgdir, char *addr, struct inode *ip, uint offset, uint sz)
int int
allocuvm(pde_t *pgdir, uint oldsz, uint newsz) allocuvm(pde_t *pgdir, uint oldsz, uint newsz)
{ {
char *a, *last, *mem; char *mem;
uint a;
if(newsz > USERTOP) if(newsz > USERTOP)
return 0; return 0;
if(newsz < oldsz) if(newsz < oldsz)
return oldsz; return oldsz;
a = (char*)PGROUNDUP(oldsz); a = PGROUNDUP(oldsz);
last = PGROUNDDOWN(newsz - 1); for(; a < newsz; a += PGSIZE){
for(; a <= last; a += PGSIZE){
mem = kalloc(); mem = kalloc();
if(mem == 0){ if(mem == 0){
cprintf("allocuvm out of memory\n"); cprintf("allocuvm out of memory\n");
@ -267,7 +267,7 @@ allocuvm(pde_t *pgdir, uint oldsz, uint newsz)
return 0; return 0;
} }
memset(mem, 0, PGSIZE); memset(mem, 0, PGSIZE);
mappages(pgdir, a, PGSIZE, PADDR(mem), PTE_W|PTE_U); mappages(pgdir, (char*)a, PGSIZE, PADDR(mem), PTE_W|PTE_U);
} }
return newsz; return newsz;
} }
@ -279,17 +279,15 @@ allocuvm(pde_t *pgdir, uint oldsz, uint newsz)
int int
deallocuvm(pde_t *pgdir, uint oldsz, uint newsz) deallocuvm(pde_t *pgdir, uint oldsz, uint newsz)
{ {
char *a, *last;
pte_t *pte; pte_t *pte;
uint pa; uint a, pa;
if(newsz >= oldsz) if(newsz >= oldsz)
return oldsz; return oldsz;
a = (char*)PGROUNDUP(newsz); a = PGROUNDUP(newsz);
last = PGROUNDDOWN(oldsz - 1); for(; a < oldsz; a += PGSIZE){
for(; a <= last; a += PGSIZE){ pte = walkpgdir(pgdir, (char*)a, 0);
pte = walkpgdir(pgdir, a, 0);
if(pte && (*pte & PTE_P) != 0){ if(pte && (*pte & PTE_P) != 0){
pa = PTE_ADDR(*pte); pa = PTE_ADDR(*pte);
if(pa == 0) if(pa == 0)
@ -351,7 +349,6 @@ bad:
// copy some data to user address va in page table pgdir. // copy some data to user address va in page table pgdir.
// most useful when pgdir is not the current page table. // most useful when pgdir is not the current page table.
// returns 1 if everthing OK, 0 on error.
// uva2ka ensures this only works for PTE_U pages. // uva2ka ensures this only works for PTE_U pages.
int int
copyout(pde_t *pgdir, uint va, void *xbuf, uint len) copyout(pde_t *pgdir, uint va, void *xbuf, uint len)