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typedef struct kernel_registers kernel_registers_t;
typedef struct registers registers_t;
#ifndef IDT_H
#define IDT_H
#include <cpu/gdt.h>
#include <cpu/io.h>
#include <log.h>
#include <stdint.h>
#include <stdio.h>
/*
* the type_attribute in the IDT_Entry struct
* is divded like this
* 7 0
* +---+---+---+---+---+---+---+---+
* | P | DPL | S | GateType |
* +---+---+---+---+---+---+---+---+
* It is 8 bits(1 byte) long
*
* P
* Present bit. Should be zero for unused
* interrupts.
*
* DPL
* Specifices the maximum ring(0 to 3) the
* interrupt can be called from.
*
* S
* Storage segment. This should be set to
* zero for all interrupt and trap gates.
*
* GateType
* Possible IDT gate types:
* 0b0101 0x5 5 80386 32 bit task gate
* 0b0110 0x6 6 80286 16-bit interrupt gate
* 0b0111 0x7 7 80286 16-bit trap gate
* 0b1110 0xE 14 80386 32-bit interrupt gate
* 0b1111 0xF 15 80386 32-bit trap gate
*/
// This enables the present bit.
#define INT_PRESENT 0x80 /* 0b10000000 */
#define INT_32_TASK_GATE(min_privlege) \
(INT_PRESENT | 0x05 | (min_privlege << 5))
#define INT_16_INTERRUPT_GATE(min_privlege) \
(INT_PRESENT | 0x06 | (min_privlege << 5))
#define INT_16_TRAP_GATE(min_privlege) \
(INT_PRESENT | 0x07 | (min_privlege << 5))
#define INT_32_INTERRUPT_GATE(min_privlege) \
(INT_PRESENT | 0x0E | (min_privlege << 5))
#define INT_32_TRAP_GATE(min_privlege) \
(INT_PRESENT | 0x0F | (min_privlege << 5))
struct interrupt_frame;
struct registers {
uint32_t error_code;
uint32_t eip;
uint32_t cs;
uint32_t eflags;
uint32_t esp;
uint32_t ss;
};
void idt_init(void);
__attribute__((no_caller_saved_registers)) void EOI(unsigned char irq);
void install_handler(void (*handler_function)(), uint16_t type_attribute,
uint8_t entry);
#endif
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