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https://github.com/Tom-on64/kern.git
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Tom-on
1d71a4e384
- New include files: idt.h, pic.h, syscall.h and exceptions.h - Proper exception handling (still could be improved - PIC properly initiated and irqs all masked - BREAKS Keyboard - The keyboard IRQ is not handled anymore - convertColor() is kinda broken :/ (More in README.md)
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
#ifndef IDT_H
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#define IDT_H
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#include "stdint.h"
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#include "screen.h"
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#define TRAP_GATE_FLAGS 0x8f // P = 1, DPL = 00, S = 0, Type = 1111 (32-bit Trap gate)
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#define INT_GATE_FLAGS 0x8e // P = 1, DPL = 00, S = 0, Type = 1110 (32-bit Int gate)
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#define USR_INT_GAME_FLAGS 0xee // P = 1, DPL = 11, S = 0, Type = 1110 (32-bit Int gate)
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typedef struct {
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uint16_t offsetLow;
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uint16_t selector;
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uint8_t zero;
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uint8_t typeAttr;
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uint16_t offsetHigh;
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} __attribute__ ((packed)) idtEntry_t;
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typedef struct {
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uint16_t limit;
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uint32_t base;
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} __attribute__ ((packed)) idtp_t;
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typedef struct {
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uint32_t eip;
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uint32_t cs;
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uint32_t eflags;
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uint32_t esp;
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uint32_t ss;
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} __attribute__ ((packed)) intFrame_t;
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__attribute__ ((aligned(0x10))) // For performance
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idtEntry_t idt[256] = { 0 };
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idtp_t idtp;
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void idtSetGate(uint8_t i, void* handler, uint8_t flags) {
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uint32_t offset = (uint32_t)handler;
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idtEntry_t* entry = &idt[i];
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entry->offsetLow = (uint16_t)offset;
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entry->selector = 0x08;
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entry->zero = 0;
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entry->typeAttr = flags;
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entry->offsetHigh = (uint16_t)(offset >> 16);
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}
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void setupIdt() {
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idtp.limit = sizeof(idtEntry_t) * 256;
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idtp.base = (uint32_t)&idt;
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__asm__ volatile ("lidt %0" : : "m"(idtp));
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}
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#endif
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