sanchayanmaity/xv6-cs450
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more cleanup

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This commit is contained in:
Frans Kaashoek 2010-07-26 08:10:02 -04:00
parent 30f5bf0548
commit de40730dad
1 changed files with 12 additions and 32 deletions
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44
vm.c
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@ -25,32 +25,14 @@
#define PHYSTOP 0x300000 #define PHYSTOP 0x300000
#define USERTOP 0xA0000 #define USERTOP 0xA0000
static uint kerntext; // Linker start kernel at 1MB static uint kerntext; // Linker starts kernel at 1MB
static uint kerntsz; static uint kerntsz;
static uint kerndata; static uint kerndata;
static uint kerndsz; static uint kerndsz;
static uint kernend; static uint kernend;
static uint freesz; static uint freesz;
pde_t *kpgdir; // One kernel page table for scheduler procs pde_t *kpgdir; // One kernel page table for scheduler procs
void
printstack()
{
uint *ebp = (uint *) rebp();
uint i;
cprintf("kernel stack: 0x%x\n", ebp);
while (ebp) {
if (ebp < (uint *) kerntext) // don't follow user ebp
return;
cprintf(" ebp %x saved ebp %x eip %x args", ebp, ebp[0], ebp[1]);
for (i = 0; i < 4; i++)
cprintf(" %x", ebp[2+i]);
cprintf("\n");
ebp = (uint *) ebp[0];
}
}
void void
printpgdir(pde_t *pgdir) printpgdir(pde_t *pgdir)
{ {
@ -99,19 +81,15 @@ walkpgdir(pde_t *pgdir, const void *va, int create)
} }
static int static int
mappages(pde_t *pgdir, void *la, uint size, uint pa, int perm, int p) mappages(pde_t *pgdir, void *la, uint size, uint pa, int perm)
{ {
uint i; uint i;
pte_t *pte; pte_t *pte;
if (p)
cprintf("mappages: pgdir 0x%x la 0x%x sz %d(0x%x) pa 0x%x, perm 0x%x\n",
pgdir, la, size, size, pa, perm);
for (i = 0; i < size; i += PGSIZE) { for (i = 0; i < size; i += PGSIZE) {
if (!(pte = walkpgdir(pgdir, (void*)(la + i), 1))) if (!(pte = walkpgdir(pgdir, (void*)(la + i), 1)))
return 0; return 0;
*pte = (pa + i) | perm | PTE_P; *pte = (pa + i) | perm | PTE_P;
if (p) cprintf("mappages 0x%x 0x%x pp %d\n", la+i, *pte, PPN(*pte));
} }
return 1; return 1;
} }
@ -178,19 +156,19 @@ setupkvm(void)
return 0; return 0;
memset(pgdir, 0, PGSIZE); memset(pgdir, 0, PGSIZE);
// Map IO space from 640K to 1Mbyte // Map IO space from 640K to 1Mbyte
if (!mappages(pgdir, (void *)USERTOP, 0x60000, USERTOP, PTE_W, 0)) if (!mappages(pgdir, (void *)USERTOP, 0x60000, USERTOP, PTE_W))
return 0; return 0;
// Map kernel text from kern text addr read-only // Map kernel text from kern text addr read-only
if (!mappages(pgdir, (void *) kerntext, kerntsz, kerntext, 0, 0)) if (!mappages(pgdir, (void *) kerntext, kerntsz, kerntext, 0))
return 0; return 0;
// Map kernel data form kern data addr R/W // Map kernel data form kern data addr R/W
if (!mappages(pgdir, (void *) kerndata, kerndsz, kerndata, PTE_W, 0)) if (!mappages(pgdir, (void *) kerndata, kerndsz, kerndata, PTE_W))
return 0; return 0;
// Map dynamically-allocated memory read/write (kernel stacks, user mem) // Map dynamically-allocated memory read/write (kernel stacks, user mem)
if (!mappages(pgdir, (void *) kernend, freesz, PADDR(kernend), PTE_W, 0)) if (!mappages(pgdir, (void *) kernend, freesz, PADDR(kernend), PTE_W))
return 0; return 0;
// Map devices such as ioapic, lapic, ... // Map devices such as ioapic, lapic, ...
if (!mappages(pgdir, (void *)0xFE000000, 0x2000000, 0xFE000000, PTE_W, 0)) if (!mappages(pgdir, (void *)0xFE000000, 0x2000000, 0xFE000000, PTE_W))
return 0; return 0;
return pgdir; return pgdir;
} }
@ -218,7 +196,7 @@ allocuvm(pde_t *pgdir, char *addr, uint sz)
return 0; return 0;
} }
memset(mem, 0, PGSIZE); memset(mem, 0, PGSIZE);
mappages(pgdir, addr + i, PGSIZE, PADDR(mem), PTE_W|PTE_U, 0); mappages(pgdir, addr + i, PGSIZE, PADDR(mem), PTE_W|PTE_U);
} }
return 1; return 1;
} }
@ -304,12 +282,13 @@ copyuvm(pde_t *pgdir, uint sz)
if (!(mem = kalloc(PGSIZE))) if (!(mem = kalloc(PGSIZE)))
return 0; return 0;
memmove(mem, (char *)pa, PGSIZE); memmove(mem, (char *)pa, PGSIZE);
if (!mappages(d, (void *)i, PGSIZE, PADDR(mem), PTE_W|PTE_U, 0)) if (!mappages(d, (void *)i, PGSIZE, PADDR(mem), PTE_W|PTE_U))
return 0; return 0;
} }
return d; return d;
} }
// Gather about physical memory layout. Called once during boot.
void void
pminit(void) pminit(void)
{ {
@ -345,7 +324,8 @@ jkstack(void)
jstack((uint) top); jstack((uint) top);
} }
// Allocate one page table for the machine for the kernel address space // Allocate one page table for the machine for the kernel address
// space for scheduler processes.
void void
kvmalloc(void) kvmalloc(void)
{ {