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#ifndef INTERRUPTS_H
#define INTERRUPTS_H
#include <stdint.h>
#include "port.h"
// TCC 0.9.26 bug?, __attribute__( ( packed ) ) on structs not working,
// also not working on members.. resorting to pragmas
#if defined( __TINYC__ )
#pragma pack(1)
#endif
// packed IDT structure, note TCC needs every member to have a packed
// attribute, GCC/Clang are happy with the packed attribute at the
// structure level
typedef struct interrupt_gate_descriptor_t {
uint16_t handler_address_low_bits;
uint16_t gdt_code_segment_selector;
uint8_t reserved;
uint8_t access;
uint16_t handler_address_high_bits;
} __attribute__( ( packed ) ) interrupt_gate_descriptor_t;
#if defined( __TINYC__ )
#pragma pack()
#endif
#define NOF_INTERRUPTS 256
#if defined( __TINYC__ )
#pragma pack(1)
#endif
typedef struct {
uint16_t size;
uint32_t base;
} __attribute__( ( packed ) ) interrupt_descriptor_table_pointer_t;
#if defined( __TINYC__ )
#pragma pack()
#endif
struct interrupt_t;
typedef uint32_t (*interrupt_handler_t)( struct interrupt_t *interrupt, uint32_t esp );
typedef struct interrupt_t {
interrupt_descriptor_table_pointer_t idt_pointer;
interrupt_gate_descriptor_t descriptor_table[NOF_INTERRUPTS];
interrupt_handler_t interrupt_handler[NOF_INTERRUPTS];
// PIC master control register: command and status register
port8_t PIC_master_control;
// PIC master data register: interrupt mask and data register
port8_t PIC_master_data;
// since PC/AT we always have a slave PIC, we don't support the PC/XT architecture
// with just one PIC
port8_t PIC_slave_control;
port8_t PIC_slave_data;
} interrupt_t;
void interrupts_enable( void );
void interrupts_disable( void );
void interrupts_init( interrupt_t *interrupt );
void interrupts_register_interrupt( interrupt_t *interrupt,
uint8_t interrupt_no, uint16_t gdt_code_segment_selector,
void (*helper_handler)( ), uint8_t privilege_level, uint8_t descriptor_type,
interrupt_handler_t handler );
void interrupts_load_idt( interrupt_descriptor_table_pointer_t *idt_pointer );
uint32_t interrupts_handle_interrupt( interrupt_t *interrupt, uint8_t interrupt_no, uint32_t esp );
uint32_t interrupts_handle_static_interrupt( uint8_t interrupt_no, uint32_t esp );
uint32_t interrupts_exception_division_by_zero( interrupt_t *interrupt, uint32_t esp );
uint32_t interrupts_interrupt_PIT( interrupt_t *interrupt, uint32_t esp );
uint32_t interrupts_interrupt_keyboard( interrupt_t *interrupt, uint32_t esp );
void interrupts_ignore_request( );
void interrupts_handle_exception_0x00( );
void interrupts_handle_irq_0x00( );
void interrupts_handle_irq_0x01( );
// initialize IDT
// handle gates
// assembly trampolines calling C (static) functions
// later: tasks and stacks, queues
#endif // INTERRUPTS_H
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