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https://github.com/tailix/kernel.git
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105 lines
3 KiB
C
105 lines
3 KiB
C
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#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(uint8_t num, uint32_t base, uint16_t sel, uint8_t flags);
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void idt_flush(uint32_t 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 (uint8_t *p = (uint8_t*)idt_entries; p < (uint8_t*)&idt_entries[256]; ++p) {
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*p = 0;
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}
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idt_set_gate(0, (uint32_t)isr0, 0x08, 0x8E);
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idt_set_gate(1, (uint32_t)isr1, 0x08, 0x8E);
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idt_set_gate(2, (uint32_t)isr2, 0x08, 0x8E);
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idt_set_gate(3, (uint32_t)isr3, 0x08, 0x8E);
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idt_set_gate(4, (uint32_t)isr4, 0x08, 0x8E);
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idt_set_gate(5, (uint32_t)isr5, 0x08, 0x8E);
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idt_set_gate(6, (uint32_t)isr6, 0x08, 0x8E);
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idt_set_gate(7, (uint32_t)isr7, 0x08, 0x8E);
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idt_set_gate(8, (uint32_t)isr8, 0x08, 0x8E);
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idt_set_gate(9, (uint32_t)isr9, 0x08, 0x8E);
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idt_set_gate(10, (uint32_t)isr10, 0x08, 0x8E);
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idt_set_gate(11, (uint32_t)isr11, 0x08, 0x8E);
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idt_set_gate(12, (uint32_t)isr12, 0x08, 0x8E);
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idt_set_gate(13, (uint32_t)isr13, 0x08, 0x8E);
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idt_set_gate(14, (uint32_t)isr14, 0x08, 0x8E);
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idt_set_gate(15, (uint32_t)isr15, 0x08, 0x8E);
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idt_set_gate(16, (uint32_t)isr16, 0x08, 0x8E);
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idt_set_gate(17, (uint32_t)isr17, 0x08, 0x8E);
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idt_set_gate(18, (uint32_t)isr18, 0x08, 0x8E);
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idt_set_gate(19, (uint32_t)isr19, 0x08, 0x8E);
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idt_set_gate(20, (uint32_t)isr20, 0x08, 0x8E);
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idt_set_gate(21, (uint32_t)isr21, 0x08, 0x8E);
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idt_set_gate(22, (uint32_t)isr22, 0x08, 0x8E);
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idt_set_gate(23, (uint32_t)isr23, 0x08, 0x8E);
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idt_set_gate(24, (uint32_t)isr24, 0x08, 0x8E);
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idt_set_gate(25, (uint32_t)isr25, 0x08, 0x8E);
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idt_set_gate(26, (uint32_t)isr26, 0x08, 0x8E);
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idt_set_gate(27, (uint32_t)isr27, 0x08, 0x8E);
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idt_set_gate(28, (uint32_t)isr28, 0x08, 0x8E);
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idt_set_gate(29, (uint32_t)isr29, 0x08, 0x8E);
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idt_set_gate(30, (uint32_t)isr30, 0x08, 0x8E);
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idt_set_gate(31, (uint32_t)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 = (uint32_t)&idt_entries;
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idt_flush((uint32_t)&idt_pointer);
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}
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void idt_set_gate(uint8_t num, uint32_t base, uint16_t sel, uint8_t 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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