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提交 7559ced5 创建 作者: Frans Kaashoek's avatar Frans Kaashoek
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get rid off clearpages

上级 37eec3b1
隐藏空白字符变更
内嵌 并排
正在显示 包含 10 行增加 和 26 行删除
defs.h
浏览文件 @ 7559ced5
......@@ -258,7 +258,7 @@ void switchkvm(void);
int copyout(struct vmap *, uint, void*, uint);
int copyin(struct vmap *, uint, void*, uint);
int pagefault(struct vmap *, uint, uint);
void clearpages(pde_t *pgdir, void *begin, void *end);
void updatepages(pde_t *pgdir, void *begin, void *end, int perm);
// namecache.c
void nc_init();
......
sysproc.c
浏览文件 @ 7559ced5
......@@ -132,9 +132,9 @@ sys_unmap(void)
if (vmap_remove(proc->vmap, PGROUNDDOWN(addr), PGROUNDUP(len)) < 0)
return -1;
clearpages(proc->vmap->pgdir,
updatepages(proc->vmap->pgdir,
(void*) (PGROUNDDOWN(addr)),
(void*) (PGROUNDDOWN(addr)+PGROUNDUP(len)));
(void*) (PGROUNDDOWN(addr)+PGROUNDUP(len)), 0);
cli();
lcr3(v2p(proc->vmap->pgdir));
for (uint i = 0; i < ncpu; i++)
......
vm.c
浏览文件 @ 7559ced5
......@@ -18,6 +18,7 @@ static pde_t *kpgdir __attribute__ ((aligned (CACHELINE))); // for use in sched
struct segdesc gdt[NSEGS];
// page map for during boot
// XXX build a static page table in assembly
static void
pgmap(void *va, void *last, uint pa)
{
......@@ -93,7 +94,6 @@ seginit(void)
// Map cpu, curproc, kmem
c->gdt[SEG_KCPU] = SEG(STA_W, &c->cpu, 12, 0);
// lgt((void *) v2p((void*)(c->gdt)), sizeof(c->gdt));
lgdt((void *)(c->gdt), sizeof(c->gdt));
loadgs(SEG_KCPU << 3);
......@@ -184,26 +184,8 @@ mappages(pde_t *pgdir, void *la, uint size, uint pa, int perm)
return 0;
}
static void
updatepages(pde_t *pgdir, void *begin, void *end, int perm)
{
char *a, *last;
pte_t *pte;
a = PGROUNDDOWN(begin);
last = PGROUNDDOWN(end);
for (;;) {
pte = walkpgdir(pgdir, a, 1);
if(pte != 0)
*pte = PTE_ADDR(*pte) | perm | PTE_P;
if (a == last)
break;
a += PGSIZE;
}
}
void
clearpages(pde_t *pgdir, void *begin, void *end)
updatepages(pde_t *pgdir, void *begin, void *end, int perm)
{
char *a, *last;
pte_t *pte;
......@@ -212,8 +194,10 @@ clearpages(pde_t *pgdir, void *begin, void *end)
last = PGROUNDDOWN(end);
for (;;) {
pte = walkpgdir(pgdir, a, 1);
if(pte != 0)
*pte = 0;
if(pte != 0) {
if (perm == 0) *pte = 0;
else *pte = PTE_ADDR(*pte) | perm | PTE_P;
}
if (a == last)
break;
a += PGSIZE;
......@@ -737,7 +721,7 @@ pagefault_wcow(struct vmap *vmap, uint va, pte_t *pte, struct vma *m, uint npg)
m->va_type = PRIVATE;
m->n = c;
// Update the hardware page tables to reflect the change to the vma
clearpages(vmap->pgdir, (void *) m->va_start, (void *) m->va_end);
updatepages(vmap->pgdir, (void *) m->va_start, (void *) m->va_end, 0);
pte = walkpgdir(vmap->pgdir, (const void *)va, 0);
*pte = v2p(m->n->page[npg]) | PTE_P | PTE_U | PTE_W;
// drop my ref to vmnode
......
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