os/kernel/cpu/i386/address_spaces.c

22 lines
722 B
C

#include "paging.h"
void address_spaces_copy_data(void* cr3, void* data,uint32_t size,void* virt_addr) {
uint32_t old_cr3;
asm volatile("movl %%cr3, %%eax; movl %%eax, %0;":"=m"(old_cr3)::"%eax");
void* phys_addr=virt_to_phys(data);
load_smap((uint32_t)cr3);
map_pages(virt_addr,phys_addr,(size/4096)+1,1,1);
load_smap(old_cr3);
}
void* address_spaces_put_data(void* cr3, void* data,uint32_t size) {
uint32_t old_cr3;
asm volatile("movl %%cr3, %%eax; movl %%eax, %0;":"=m"(old_cr3)::"%eax");
void* phys_addr=virt_to_phys(data);
load_smap((uint32_t)cr3);
void* virt_addr=find_free_pages((size/4096)+1);
map_pages(virt_addr,phys_addr,(size/4096)+1,1,1);
load_smap(old_cr3);
return virt_addr;
}