interrupt.c

用于汇编领域的,运用于OS的MAIN函数.基于硬件基础的源代码

#include "hos.h"

unsigned long get_current_eflags(void);

void do_dummy_interrupt_handler(struct pt_regs *regs)
{
	printk("[kernel]Not implemented interrupt\n");
        display_regs(regs);
	//dump_interrupt_state(state);

	STOP();
}

/* =========================================================== */
/* =========================================================== */

void init_interrupt(void)
{
	int i;

	for(i = 0; i < 256; i++)
		set_intr_gate(i, &dummy_interrupt_handler);

	init_idt();

	enable_interrupts();
}

int is_interrupts_enabled(void)
{
	unsigned long efalgs = get_current_eflags();
	return (efalgs & EFLAGS_IF) != 0;
}

unsigned long get_current_eflags(void)
{
	unsigned long eflags;
	
	__asm__ __volatile__ (
		"pushfl \t\n"
		"pop	%0 \t\n"
		: "=a" (eflags)
	);

	return eflags;
}

void mask_irq(unsigned char irq)
{
	if(irq < 8)
		outbyte(0x21, ((1<<irq) | inbyte(0x21)));
	else
		outbyte(0xA1, ((1<<(irq-8)) | inbyte(0xA1)));
}

void unmask_irq(unsigned char irq)
{
	if(irq < 8)
		outbyte(0x21, (~(1<<irq) & inbyte(0x21)));
	else
		outbyte(0xA1, (~(1<<(irq-8)) & inbyte(0xA1)));
}
/*
void dump_interrupt_state(interrupt_state_t *state)
{
	unsigned int errorcode = state->errorcode;

	printk("eax = %x ebx = %x ecx = %x edx = %x\n"
		"esi = %x edi = %x ebp = %x\n"
		"eip = %x cs = %x eflags = %x\n"
		"interrupt number = %d, error code = %d\n"
		"index = %d, TI = %d, IDT = %d, EXT = %d\n",
		state->eax, state->ebx, state->ecx, state->edx,
		state->esi, state->edi, state->ebp,
		state->eip, state->cs, state->eflags,
		state->intnum, errorcode,
		errorcode >> 3, (errorcode >> 2) & 1, (errorcode >> 1) & 1,
		errorcode & 1);
}
*/