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#include "loader_paging.h"
uint64_t *get_page_map(void)
{
uint64_t map;
__asm__("mov %%cr3, %0" : "=r"(map));
return (uint64_t *)(page_address(map, 1));
}
void set_page_map(uint64_t *map)
{
__asm__ volatile
(
"pushf\n\t"
"cli\n\t"
"mov %0, %%cr3\n\t"
"popf\n\t"
:
: "r"(map));
}
uint64_t *get_page_table(uint64_t *map, uint64_t virt, int level)
{
if ((level < 1) || (level > PAGE_MAP_LEVELS))
{
return NULL;
}
for (int i = PAGE_MAP_LEVELS; i > level; i--)
{
if (!map[pte_index(virt, i)])
{
map[pte_index(virt, i)] =
(uint64_t)new_page_table()|PAGE_PR|PAGE_WR;
}
map = (uint64_t *)page_address(map[pte_index(virt, i)], 1);
}
return map;
}
uint64_t *get_page_entry(uint64_t *map, uint64_t virt)
{
int level = 1;
uint64_t *table = get_page_table(map, virt, level);
return &table[pte_index(virt, level)];
}
void map_page(void *map,
uint64_t virt,
uint64_t phys,
enum page_type type)
{
*get_page_entry(map, virt) = phys | type;
}
void map_pages(void *map,
uint64_t virt,
uint64_t phys,
enum page_type type,
size_t size)
{
for (size_t offset = 0; offset < size; offset += page_size(1))
{
map_page(map, virt + offset, phys + offset, type);
}
}
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