53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
#ifndef RK_IDT_H_
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#define RK_IDT_H_
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#include <stdint.h>
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#define GDT_SEGMENT_SELECTOR(i, p) ((i << 3) | p)
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#define LDT_SEGMENT_SELECTOR(i, p) ((i << 3) | 0x04 | p)
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#define IDT_ENTRY_COUNT 256
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struct idt_entry {
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uint16_t offset_lo;
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uint16_t seg_select;
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uint8_t reserved;
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uint8_t attributes;
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uint16_t offset_hi;
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} __attribute__ ((packed));
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struct idtr {
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uint16_t size;
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uint32_t base;
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} __attribute__ ((packed));
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enum IDT_ATTRIBUTES {
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TASK_GATE = 0x05,
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INT_GATE_16 = 0x06,
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TRAP_GATE_16 = 0x07,
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INT_GATE_32 = 0x0E,
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TRAP_GATE_32 = 0x0F,
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INT_RING0 = 0x00,
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INT_RING1 = 0x20,
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INT_RING2 = 0x40,
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INT_RING3 = 0x60,
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INT_PRESENT = 0x80,
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};
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struct registers {
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uint32_t edi, esi, ebp, esp, ebx, edx, ecx, eax; /* Pushed by pusha. */
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uint32_t int_no, err_code; /* Interrupt number and error code (if applicable) */
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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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};
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void encode_idt_entry(struct idt_entry idt[], int i, uint32_t offset, uint16_t segment_selector, uint8_t attributes);
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void flush_idt(uint32_t idt_pointer);
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void exception_handler(struct registers regs);
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#endif
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