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Fix virt_to_phys

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pjht 2019-05-04 10:49:27 -05:00
parent 355fd3d6ed
commit 6036151e0d
1 changed files with 3 additions and 3 deletions
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6
cpu/i386/paging.c
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@ -92,11 +92,11 @@ void* alloc_pages(int num_pages) {
void* virt_to_phys(void* virt_addr_arg) { void* virt_to_phys(void* virt_addr_arg) {
uint32_t virt_addr=(uint32_t)virt_addr_arg; uint32_t virt_addr=(uint32_t)virt_addr_arg;
int offset=virt_addr&0xFFFF; int offset=virt_addr&0x3FF;
virt_addr=virt_addr&0xFFFFFC00; virt_addr=virt_addr&0xFFFFFC00;
if (!is_page_present(virt_addr>>12)) return NULL; if (!is_page_present(virt_addr>>12)) return NULL;
int dir_idx=virt_addr&0xFFC00000; int dir_idx=(virt_addr&0xFFC00000)>>22;
int tbl_idx=virt_addr&0x3FFC00; int tbl_idx=(virt_addr&0x3FFC00)>>12;
if ((smap[dir_idx]&0x1)==0) { if ((smap[dir_idx]&0x1)==0) {
return 0; return 0;
} }