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Init IDT

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This commit is contained in:
Kamil Kowalczyk
2025-08-15 20:46:11 +02:00
parent c6c12d93a0
commit 922fee88c7
4 changed files with 53 additions and 2 deletions
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4
kernel/hal/x86_64/gdt.c
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@ -55,7 +55,7 @@ static uint64_t gdt_curretbase(void) {
return gdtr.base;
}
void gdt_setenty(GdtEntry *entry, uint32_t base, uint32_t limit, uint8_t access, uint8_t gran) {
void gdt_setentry(GdtEntry *entry, uint32_t base, uint32_t limit, uint8_t access, uint8_t gran) {
entry->baselow = base & 0xffff;
entry->basemid = (base >> 16) & 0xff;
entry->basehigh = (base >> 24) & 0xff;
@ -74,7 +74,7 @@ void gdt_init(void) {
uint64_t tss_base = (uint64_t)&tss;
uint32_t tss_limit = sizeof(tss) - 1;
gdt_setenty(&curgdt->tsslow, tss_base & 0xFFFFFFFF, tss_limit, GDT_PRESENT | GDT_TSS, 0x0);
gdt_setentry(&curgdt->tsslow, tss_base & 0xFFFFFFFF, tss_limit, GDT_PRESENT | GDT_TSS, 0x0);
GdtEntry *tsshigh = &curgdt->tsshigh;
tsshigh->baselow = (tss_base >> 32) & 0xffff;

2
kernel/hal/x86_64/hal.c
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@ -4,6 +4,7 @@
#include "kprintf.h"
#include "serial.h"
#include "gdt.h"
#include "idt.h"
void hal_init(void) {
if (!serial_init()) {
@ -11,6 +12,7 @@ void hal_init(void) {
}
LOG("hal", "serial init\n");
gdt_init();
idt_init();
}
__attribute__((noreturn)) void hal_hang(void) {

25
kernel/hal/x86_64/idt.c Normal file
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@ -0,0 +1,25 @@
#include <stdint.h>
#include "idt.h"
#include "kprintf.h"
#define ENTRIES 256
static IdtGate idtgates[ENTRIES] = {0};
static Idt idt;
void idt_setgate(int i, uint64_t handler, uint8_t flags) {
idtgates[i].isrlow = (uint16_t)handler;
idtgates[i].kernelcs = 40;
idtgates[i].ist = 0;
idtgates[i].resv = 0;
idtgates[i].attrs = flags;
idtgates[i].isrmid = (uint16_t)(handler >> 16);
idtgates[i].isrhigh = (uint16_t)(handler >> 32);
}
void idt_init(void) {
idt.base = (uint64_t)&idtgates;
idt.limit = ENTRIES * sizeof(IdtGate) - 1;
asm volatile("lidt %0" :: "m"(idt) : "memory");
LOG("idt", "idt init\n");
}

24
kernel/hal/x86_64/idt.h Normal file
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@ -0,0 +1,24 @@
#ifndef HAL_IDT_H_
#define HAL_IDT_H_
#include <stdint.h>
#include "compiler/attr.h"
typedef struct {
uint16_t isrlow;
uint16_t kernelcs;
uint8_t ist;
uint8_t attrs;
uint16_t isrmid;
uint32_t isrhigh;
uint32_t resv;
} PACKED IdtGate;
typedef struct {
uint16_t limit;
uint64_t base;
} PACKED Idt;
void idt_init(void);
#endif // HAL_IDT_H_