Imbus/xv6-riscv-kernel
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map kernel instructions r/o

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This commit is contained in:
Robert Morris 2010-09-20 06:00:22 -04:00
parent 26d11ee8dc
commit a9183883b8
2 changed files with 35 additions and 2 deletions
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9
vm.c
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@ -125,6 +125,9 @@ pde_t*
setupkvm(void)
{
pde_t *pgdir;
extern char etext[];
char *rwstart = PGROUNDDOWN(etext) - PGSIZE;
uint rwlen = (uint)rwstart - 0x100000;
// Allocate page directory
if(!(pgdir = (pde_t *) kalloc()))
@ -132,8 +135,10 @@ setupkvm(void)
memset(pgdir, 0, PGSIZE);
if(// Map IO space from 640K to 1Mbyte
!mappages(pgdir, (void *)USERTOP, 0x60000, USERTOP, PTE_W) ||
// Map kernel and free memory pool
!mappages(pgdir, (void *)0x100000, PHYSTOP-0x100000, 0x100000, PTE_W) ||
// Map kernel instructions
!mappages(pgdir, (void *)0x100000, rwlen, 0x100000, 0) ||
// Map kernel data and free memory pool
!mappages(pgdir, rwstart, PHYSTOP-(uint)rwstart, (uint)rwstart, PTE_W) ||
// Map devices such as ioapic, lapic, ...
!mappages(pgdir, (void *)0xFE000000, 0x2000000, 0xFE000000, PTE_W))
return 0;