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reboot is done

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This commit is contained in:
0x35c
2024-09-11 16:46:39 +02:00
parent 52951c96d5
commit e7a8d39ad7
3 changed files with 91 additions and 15 deletions
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71
src/gdt/gdt.c
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@ -2,17 +2,18 @@
#include "gdt.h"
#include "kprintf.h"
#include "string.h"
extern void set_gdt(uint32_t gdt_ptr);
uint8_t gdt_entries[GDT_SIZE * 8];
struct gdt_descriptor *gdtr = (struct gdt_descriptor *) GDT_ADDRESS;
struct gdt_descriptor *gdtr = (struct gdt_descriptor *)GDT_ADDRESS;
static void set_gdt_entry_value(uint8_t *target, uint32_t base, uint32_t limit, uint8_t access, uint8_t granularity)
static void set_gdt_entry_value(uint8_t *target, uint32_t base, uint32_t limit,
uint8_t access, uint8_t granularity)
{
if (limit > 0xFFFFF) {
kprintf(KERN_ERR, "GDT cannot encode limits larger than 0xFFFFF");
kprintf(KERN_ERR,
"GDT cannot encode limits larger than 0xFFFFF");
}
// Encode the limit
@ -33,20 +34,62 @@ static void set_gdt_entry_value(uint8_t *target, uint32_t base, uint32_t limit,
target[6] |= (granularity << 4);
}
void initGdt()
void initGdt(void)
{
gdtr->size = 8 * GDT_SIZE - 1;
gdtr->base = (uint32_t) &gdt_entries;
gdtr->base = (uint32_t)&gdt_entries;
set_gdt_entry_value(gdt_entries + 0x00, 0, 0, 0, 0); // Null segment
set_gdt_entry_value(gdt_entries + 0x00, 0, 0, 0, 0); // Null segment
set_gdt_entry_value(gdt_entries + 0x08, 0, 0xFFFFF, GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_KERNEL_MODE | GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_EXECUTABLE | GDT_ACCESS_DC_NOT_CONFORM | GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA | GDT_ACCESS_A_ACCESSED, GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // Kernel code
set_gdt_entry_value(gdt_entries + 0x10, 0, 0xFFFFF, GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_KERNEL_MODE | GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_NOT_EXECUTABLE | GDT_ACCESS_DC_NOT_CONFORM | GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA | GDT_ACCESS_A_ACCESSED, GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // Kernel data
set_gdt_entry_value(gdt_entries + 0x18, 0, 0x0, GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_KERNEL_MODE | GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_NOT_EXECUTABLE | GDT_ACCESS_DC_CONFORM |GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA | GDT_ACCESS_A_ACCESSED, GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // Kernel stack
set_gdt_entry_value(
gdt_entries + 0x08, 0, 0xFFFFF,
GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_KERNEL_MODE |
GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_EXECUTABLE |
GDT_ACCESS_DC_NOT_CONFORM |
GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA |
GDT_ACCESS_A_ACCESSED,
GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // Kernel code
set_gdt_entry_value(
gdt_entries + 0x10, 0, 0xFFFFF,
GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_KERNEL_MODE |
GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_NOT_EXECUTABLE |
GDT_ACCESS_DC_NOT_CONFORM |
GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA |
GDT_ACCESS_A_ACCESSED,
GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // Kernel data
set_gdt_entry_value(
gdt_entries + 0x18, 0, 0x0,
GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_KERNEL_MODE |
GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_NOT_EXECUTABLE |
GDT_ACCESS_DC_CONFORM |
GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA |
GDT_ACCESS_A_ACCESSED,
GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // Kernel stack
set_gdt_entry_value(gdt_entries + 0x20, 0, 0xFFFFF, GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_USER_MODE | GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_EXECUTABLE | GDT_ACCESS_DC_CONFORM | GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA | GDT_ACCESS_A_ACCESSED, GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // User code
set_gdt_entry_value(gdt_entries + 0x28, 0, 0xFFFFF, GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_USER_MODE | GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_NOT_EXECUTABLE | GDT_ACCESS_DC_NOT_CONFORM | GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA | GDT_ACCESS_A_ACCESSED, GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // User data
set_gdt_entry_value(gdt_entries + 0x30, 0, 0xFFFFF, GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_USER_MODE | GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_NOT_EXECUTABLE | GDT_ACCESS_DC_CONFORM | GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA | GDT_ACCESS_A_ACCESSED, GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // User stack
set_gdt_entry_value(
gdt_entries + 0x20, 0, 0xFFFFF,
GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_USER_MODE |
GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_EXECUTABLE |
GDT_ACCESS_DC_CONFORM |
GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA |
GDT_ACCESS_A_ACCESSED,
GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // User code
set_gdt_entry_value(
gdt_entries + 0x28, 0, 0xFFFFF,
GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_USER_MODE |
GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_NOT_EXECUTABLE |
GDT_ACCESS_DC_NOT_CONFORM |
GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA |
GDT_ACCESS_A_ACCESSED,
GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // User data
set_gdt_entry_value(
gdt_entries + 0x30, 0, 0xFFFFF,
GDT_ACCESS_P_VALID | GDT_ACCESS_DPL_USER_MODE |
GDT_ACCESS_S_CODE_OR_DATA | GDT_ACCESS_E_NOT_EXECUTABLE |
GDT_ACCESS_DC_CONFORM |
GDT_ACCESS_RW_READABLE_FOR_CODE_WRITABLE_FOR_DATA |
GDT_ACCESS_A_ACCESSED,
GDT_FLAG_32BIT_MODE | GDT_FLAG_PAGE_MODE); // User stack
set_gdt(((uint32_t) gdtr));
set_gdt(((uint32_t)gdtr));
}