int.h

// SYS86 project
// Interrupt handling

#pragma once

#include "config.h"
#include "types.h"

// Hardware interrupt vectors
// R8810 specific

#define VECT_TIMER0 0x08
#define VECT_SERIAL 0x14

// System call vector

#define VECT_SYSTEM 0x80

// Stack frame after interrupt entry
// Same offsets as in reg_s structure

#define regs_di     2*0x0
#define regs_si     2*0x1
#define regs_bp     2*0x2
#define regs_bx     2*0x3
#define regs_dx     2*0x4
#define regs_cx     2*0x5
#define regs_ax     2*0x6
#define regs_ds     2*0x7
#define regs_es     2*0x8
#define regs_num    2*0x9
#define regs_ip     2*0xA
#define regs_cs     2*0xB
#define regs_fl     2*0xC

#define REGS_SIZE   2*0xD

#ifndef _ASSEMBLY

// Same offsets as defined by regs_* constants

struct regs_s {
	reg_t di;
	reg_t si;
	reg_t bp;
	reg_t bx;
	reg_t dx;
	reg_t cx;
	reg_t ax;
	reg_t ds;
	reg_t es;
	reg_t num;
	reg_t ip;
	reg_t cs;
	reg_t fl;
	};

extern int int_level;

// Fast flags save & restore

#define int_save(x) \
asm volatile ("pushfw\npopw %0\ncli\n" \
	:"=r" (x):/* no input */:"memory")

#define int_restore(x) \
asm volatile ("pushw %0\npopfw\n" \
	:/* no output */:"r" (x):"memory")

// From assembly

void vect_set (byte_t vect, void * hand);

void int_timer0 (void);
void int_serial (void);
void int_system (void);

// Interrupt controller

void int_end (byte_t vect);
void int_enable (byte_t vect);

// Interrupt management

void int_proc (byte_t vect);

void int_init (void);

void int_set_timer (void);
void int_set_serial (void);

#endif  // !_ASSEMBLY