38 lines
915 B
C
38 lines
915 B
C
//
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// Created by rick on 8/18/19.
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//
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#include <sys/types.h>
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#ifndef MY_KERNEL_IDT_H
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#define MY_KERNEL_IDT_H
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#include <myke/attributes.h>
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#define KERNEL_CS 0x08
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/* How every interrupt gate (handler) is defined */
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typedef struct {
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uint16_t low_offset; /* Lower 16 bits of handler function address */
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uint16_t sel; /* Kernel segment selector */
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uint8_t always0;
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/* First byte
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* Bit 7: "Interrupt is present"
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* Bits 6-5: Privilege level of caller (0=kernel..3=user)
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* Bit 4: Set to 0 for interrupt gates
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* Bits 3-0: bits 1110 = decimal 14 = "32 bit interrupt gate" */
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uint8_t flags;
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uint16_t high_offset; /* Higher 16 bits of handler function address */
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} packed idt_gate_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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} packed idt_register_t;
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#define IDT_REGISTERS 256
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void set_idt_gate(int n, uint32_t handler);
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void set_idt();
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#endif //MY_KERNEL_IDT_H
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