31 lines
788 B
C
31 lines
788 B
C
#include <kernel/pic8259.h>
|
|
|
|
void pic_send_eoi(uint8_t irq) {
|
|
if (irq > 7)
|
|
outportb(PIC_2_COMMAND, PIC_EOI);
|
|
else
|
|
outportb(PIC_1_COMMAND, PIC_EOI);
|
|
}
|
|
|
|
void pic_remap(int pic1_start, int pic2_start) {
|
|
// Mask all IRQ lines
|
|
outportb(PIC_1_DATA, 0xff);
|
|
outportb(PIC_2_DATA, 0xff);
|
|
|
|
// Initialize master PIC
|
|
outportb(PIC_1_COMMAND, ICW4_NEEDED | INIT_BIT);
|
|
outportb(PIC_1_DATA, pic1_start);
|
|
outportb(PIC_1_DATA, PIC_1_ICW3);
|
|
outportb(PIC_1_DATA, 0x01);
|
|
|
|
// Initialize slave PIC
|
|
outportb(PIC_2_COMMAND, ICW4_NEEDED | INIT_BIT);
|
|
outportb(PIC_2_DATA, pic2_start);
|
|
outportb(PIC_2_DATA, PIC_2_ICW3);
|
|
outportb(PIC_2_DATA, 0x01);
|
|
|
|
// Unmask
|
|
outportb(PIC_1_DATA, 0b11111101);
|
|
outportb(PIC_2_DATA, 0b11111101);
|
|
}
|