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add unmap_pages

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pjht 2019-05-28 16:05:51 -05:00
parent 38c39611fd
commit 9654487b5b
2 changed files with 17 additions and 0 deletions
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16
kernel/cpu/i386/paging.c
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@ -153,6 +153,22 @@ void load_smap(uint32_t cr3) {
}
}
void unmap_pages(void* start_virt,uint32_t num_pages) {
uint32_t virt_addr=(uint32_t)start_virt;
int dir_entry=(virt_addr&0xFFC00000)>>22;
int table_entry=(virt_addr&0x3FF000)>>12;
for (int i=0;i<=num_pages;i++) {
if (smap[dir_entry]&0x1) {
smap_page_tables[dir_entry+1]=(smap[dir_entry]&0xFFFFFC00)|0x3;
smap[(1024+(1024*dir_entry))+table_entry]=0;
table_entry++;
if (table_entry==1024) {
dir_entry++;
table_entry=0;
}
}
}
}
void paging_init() {
for (uint32_t i=0;i<NUM_KERN_DIRS*1024;i++) {

1
kernel/cpu/i386/paging.h
View File

@ -7,6 +7,7 @@
#define NUM_KERN_DIRS 1
void map_pages(void* virt_addr_ptr,void* phys_addr_ptr,int num_pages,char usr,char wr);
void unmap_pages(void* start_virt,uint32_t num_pages);
void* alloc_pages(int num_pages);
void alloc_pages_virt(int num_pages,void* addr);
void paging_init();