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https://github.com/tailix/kernel.git
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104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
#include "idt.h"
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#include "logger.h"
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static struct IdtPointer idt_pointer;
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static struct IdtEntry idt_entries[256];
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static void idt_set_gate(unsigned char num, unsigned int base, unsigned short sel, unsigned char flags);
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void idt_flush(unsigned int pointer);
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void isr0();
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void isr1();
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void isr2();
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void isr3();
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void isr4();
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void isr5();
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void isr6();
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void isr7();
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void isr8();
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void isr9();
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void isr10();
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void isr11();
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void isr12();
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void isr13();
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void isr14();
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void isr15();
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void isr16();
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void isr17();
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void isr18();
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void isr19();
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void isr20();
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void isr21();
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void isr22();
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void isr23();
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void isr24();
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void isr25();
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void isr26();
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void isr27();
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void isr28();
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void isr29();
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void isr30();
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void isr31();
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void idt_initialize()
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{
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logger_info("Setup IDT.");
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for (unsigned char *p = (unsigned char*)idt_entries; p < (unsigned char*)&idt_entries[256]; ++p) {
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*p = 0;
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}
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idt_set_gate(0, (unsigned int)isr0, 0x08, 0x8E);
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idt_set_gate(1, (unsigned int)isr1, 0x08, 0x8E);
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idt_set_gate(2, (unsigned int)isr2, 0x08, 0x8E);
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idt_set_gate(3, (unsigned int)isr3, 0x08, 0x8E);
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idt_set_gate(4, (unsigned int)isr4, 0x08, 0x8E);
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idt_set_gate(5, (unsigned int)isr5, 0x08, 0x8E);
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idt_set_gate(6, (unsigned int)isr6, 0x08, 0x8E);
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idt_set_gate(7, (unsigned int)isr7, 0x08, 0x8E);
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idt_set_gate(8, (unsigned int)isr8, 0x08, 0x8E);
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idt_set_gate(9, (unsigned int)isr9, 0x08, 0x8E);
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idt_set_gate(10, (unsigned int)isr10, 0x08, 0x8E);
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idt_set_gate(11, (unsigned int)isr11, 0x08, 0x8E);
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idt_set_gate(12, (unsigned int)isr12, 0x08, 0x8E);
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idt_set_gate(13, (unsigned int)isr13, 0x08, 0x8E);
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idt_set_gate(14, (unsigned int)isr14, 0x08, 0x8E);
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idt_set_gate(15, (unsigned int)isr15, 0x08, 0x8E);
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idt_set_gate(16, (unsigned int)isr16, 0x08, 0x8E);
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idt_set_gate(17, (unsigned int)isr17, 0x08, 0x8E);
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idt_set_gate(18, (unsigned int)isr18, 0x08, 0x8E);
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idt_set_gate(19, (unsigned int)isr19, 0x08, 0x8E);
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idt_set_gate(20, (unsigned int)isr20, 0x08, 0x8E);
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idt_set_gate(21, (unsigned int)isr21, 0x08, 0x8E);
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idt_set_gate(22, (unsigned int)isr22, 0x08, 0x8E);
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idt_set_gate(23, (unsigned int)isr23, 0x08, 0x8E);
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idt_set_gate(24, (unsigned int)isr24, 0x08, 0x8E);
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idt_set_gate(25, (unsigned int)isr25, 0x08, 0x8E);
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idt_set_gate(26, (unsigned int)isr26, 0x08, 0x8E);
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idt_set_gate(27, (unsigned int)isr27, 0x08, 0x8E);
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idt_set_gate(28, (unsigned int)isr28, 0x08, 0x8E);
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idt_set_gate(29, (unsigned int)isr29, 0x08, 0x8E);
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idt_set_gate(30, (unsigned int)isr30, 0x08, 0x8E);
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idt_set_gate(31, (unsigned int)isr31, 0x08, 0x8E);
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logger_info("Load IDT.");
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idt_pointer.limit = sizeof(struct IdtEntry) * 256 - 1;
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idt_pointer.base = (unsigned int)&idt_entries;
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idt_flush((unsigned int)&idt_pointer);
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}
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void idt_set_gate(unsigned char num, unsigned int base, unsigned short sel, unsigned char flags)
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{
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idt_entries[num].base_lo = base & 0xFFFF;
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idt_entries[num].base_hi = (base >> 16) & 0xFFFF;
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idt_entries[num].sel = sel;
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idt_entries[num].always0 = 0;
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// We must uncomment the OR below when we get to using user-mode.
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// It sets the interrupt gate's privilege level to 3.
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idt_entries[num].flags = flags /* | 0x60 */;
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}
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