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#include "panic.h"
#include "arch.h"
#include <arch/i686/paging.h>
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <print.h>
extern struct page_directory_t page_directory[1024];
extern struct page_table_t page_tables[1024][1024];
// static uintptr_t KERNEL_MAPPING = 0xC0000000;
void setup_pgdir(struct page_directory_t pgdir[1024]) {
for(int i = 0; i < 1024; i++) {
pgdir[i].present = 0;
pgdir[i].rw_flag = 1;
pgdir[i].access_lvl = 0;
}
}
void paging_ident(struct page_table_t tbl[1024]) {
size_t size = 1024;
for(size_t i = 0; i < size; i++) {
tbl[i].rw_flag = 1;
tbl[i].access_lvl = 0;
tbl[i].phys_addr = i;
tbl[i].present = 1;
}
}
void map_page(struct page_table_t tbl[1024], void *addr) {
uintptr_t ptr = (uintptr_t) addr;
ptr &= 0xfffff000;
ptr >>= 16;
for(size_t i = 0; i < 4096; i++) {
tbl[i].rw_flag = 1;
tbl[i].access_lvl = 0;
tbl[i].phys_addr = ptr / 4096 + i;
tbl[i].present = 1;
}
}
void unmap_page(struct page_table_t tbl[1024]) {
for(size_t i = 0; i < 4096; i++) {
tbl[i].rw_flag = 1;
tbl[i].access_lvl = 0;
tbl[i].phys_addr = 0;
tbl[i].present = 0;
}
}
void ident_map_addr(void *addr, size_t len) {
uintptr_t ptr = (uintptr_t) addr;
int i = ptr / 0x400000;
// int c = len / 0x1000 + (len % 0x1000 ? 1 : 0);
// for (; c > 0; c--, i++) {
// paging_ident(page_tables[i]);
// }
paging_ident(page_tables[i]);
}
void ident_unmap_addr(void *addr, size_t len) {
uintptr_t ptr = (uintptr_t) addr;
int i = ptr / 0x1000;
int c = len / 0x1000 + (len % 0x1000 ? 1 : 0);
for (; c > 0; c--, i++) {
page_tables[i / 1024][i % 1024].present = 0;
page_tables[i / 1024][i % 1024].rw_flag = 1;
page_tables[i / 1024][i % 1024].access_lvl = 0;
}
}
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