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kernel
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Add mapping func

This commit is contained in:
Alex Kotov 2021-12-19 06:25:11 +05:00
parent 6dc84eba38
commit be3fb904d8
Signed by: kotovalexarian
GPG Key ID: 553C0EBBEB5D5F08
1 changed files with 34 additions and 29 deletions
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63
kernel/paging.c
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@ -1,10 +1,11 @@
#include "paging.h"
#include "panic.h"
#include <kernaux/libc.h>
#include <kernaux/stdlib.h>
static void mapping(struct Paging *paging, uint32_t virt, uint32_t phys);
void paging_load(struct Paging *const paging)
{
uint32_t page_dir_phys = (uint32_t)&paging->page_dir;
@ -49,17 +50,8 @@ void paging_clear(struct Paging *const paging)
void paging_identity(struct Paging *const paging)
{
for (size_t i = 0; i < PAGE_DIR_LENGTH; ++i) {
paging->page_dir[i].addr = PAGE_DIR_ADDR(i * PAGE_BIG_SIZE);
paging->page_dir[i].available1 = 0;
paging->page_dir[i].page_size = 1;
paging->page_dir[i].available0 = 0;
paging->page_dir[i].accessed = 0;
paging->page_dir[i].cache_disabled = 1;
paging->page_dir[i].write_through = 1;
paging->page_dir[i].user = 1;
paging->page_dir[i].writable = 1;
paging->page_dir[i].present = 1;
const size_t addr = i * PAGE_BIG_SIZE;
mapping(paging, addr, addr);
}
}
@ -70,27 +62,40 @@ void paging_mapkernel(
assert(!(kinfo->kernel_phys_base % PAGE_BIG_SIZE), "Kernel physical address is not aligned.");
assert(!(kinfo->kernel_virt_base % PAGE_BIG_SIZE), "Kernel virtual address is not aligned.");
size_t pde = kinfo->kernel_virt_base / PAGE_BIG_SIZE;
size_t phys = kinfo->kernel_phys_base;
size_t virt = kinfo->kernel_virt_base;
size_t mapped = 0;
size_t kern_phys = kinfo->kernel_phys_base;
while (mapped < kinfo->kernel_size) {
paging->page_dir[pde].addr = PAGE_DIR_ADDR(kern_phys);
paging->page_dir[pde].available1 = 0;
paging->page_dir[pde].page_size = 1;
paging->page_dir[pde].available0 = 0;
paging->page_dir[pde].accessed = 0;
paging->page_dir[pde].cache_disabled = 0;
paging->page_dir[pde].write_through = 0;
paging->page_dir[pde].user = 0;
paging->page_dir[pde].writable = 1;
paging->page_dir[pde].present = 1;
mapping(paging, virt, phys);
phys += PAGE_BIG_SIZE;
virt += PAGE_BIG_SIZE;
mapped += PAGE_BIG_SIZE;
kern_phys += PAGE_BIG_SIZE;
++pde;
}
}
void mapping(
struct Paging *const paging,
const uint32_t virt,
const uint32_t phys
) {
KERNAUX_NOTNULL_RETURN(paging);
const size_t pde_index = virt / PAGE_BIG_SIZE;
struct KernAux_Arch_I386_PDE *const pde = &paging->page_dir[pde_index];
if (!pde->present) {
pde->addr = PAGE_DIR_ADDR(phys);
pde->available1 = 0;
pde->page_size = 1;
pde->available0 = 0;
pde->accessed = 0;
pde->cache_disabled = 0;
pde->write_through = 0;
pde->user = 0;
pde->writable = 1;
pde->present = 1;
}
}