/
isr.cpp
executable file
·54 lines (44 loc) · 1.25 KB
/
isr.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
#include "io.h"
#include "isr.h"
#include "iolib.h"
#include <stdio.h>
#include "idt.h"
isr_t interrupt_handlers[256];
void register_interrupt_handler(u8 n, isr_t handler)
{
interrupt_handlers[n] = handler;
}
// This gets called from our ASM interrupt handler stub.
extern "C" void isr_handler(registers_t regs)
{
printf("recieved interrupt: %d\n", regs.int_no);
if (interrupt_handlers[regs.int_no] != 0)
{
isr_t handler = interrupt_handlers[regs.int_no];
handler(regs);
}
}
// This gets called from our ASM interrupt handler stub.
extern "C" void irq_handler(registers_t regs)
{
// printf("recieved irq: ");
// print_dec32(regs.int_no);
// printf("\n");
// Send an EOI (end of interrupt) signal to the PICs.
// If this interrupt involved the slave.
if (regs.int_no >= 40)
{
//printf("Sending reset signal to slave\n");
// Send reset signal to slave.
idt_outb_delay(0x20, 0xA0);
}
// Send reset signal to master. (As well as slave, if necessary).
idt_outb_delay(0x20, 0x20);
// linux seems to do
//idt_outb_delay(0x60, 0x20);
if (interrupt_handlers[regs.int_no] != 0)
{
isr_t handler = interrupt_handlers[regs.int_no];
handler(regs);
}
}