mbr_asm/irq.h

#pragma once
#include "interrupt.h"

#define save_flags(flags) asm volatile("pushfl ; popl %0" : "=g"(flags)::"memory")
#define restore_flags(flags) asm volatile("push %0; popfl" ::"g"(flags) : "memory")

#define disable_IRQs(flags)                                                                   \
    ({                                                                                        \
        save_flags(flags);                                                                    \
        asm("cli\n");                                                                         \
    })
#define restore_IRQs(flags) restore_flags(flags)


#define IRQ_TIMER         0 // MASTER IRQ
#define IRQ_KEYBOARD      1 
#define IRQ_SLAVE_PIC     2 
#define IRQ_COM2          3 
#define IRQ_COM1          4 
#define IRQ_LPT2          5 
#define IRQ_FLOPPY        6 
#define IRQ_LPT1          7
#define IRQ_8_NOT_DEFINED 8 // SLAVE
#define IRQ_RESERVED_1    9 // SLAVE IRQ
#define IRQ_RESERVED_2    10
#define IRQ_RESERVED_3    11
#define IRQ_RESERVED_4    12
#define IRQ_COPROCESSOR   13
#define IRQ_HARDDISK      14
#define IRQ_RESERVED_5    15

#define IRQ_INTERRUPT_BASE_ADDRESS 0x20
#define IRQ_NUM 16

// An handler should finish by the iret opcode -> https://wiki.osdev.org/Interrupt_Service_Routines
// That's why we use wrapper around them or the gcc interrupt attribut
// __attribute__((interrupt)) void (*irq_handler)(int irq);
typedef void (*irq_handler)(struct interrupt_frame *frame);
int irqSetup();
int irqSetRoutine(int irq, irq_handler handler);