44 lines
732 B
C
44 lines
732 B
C
#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <sys/pic.h>
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#include <sys/cpu.h>
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void pic_eoi(int irq) {
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if (irq >= 8) {
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outb(0xa0, 0x20);
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}
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outb(0x20, 0x20);
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}
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// Flush all potentially pending IRQs
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void pic_flush(void) {
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for (int i = 0; i < 16; i++)
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pic_eoi(i);
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}
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void pic_set_mask(int line, bool status) {
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uint16_t port;
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uint8_t value;
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if (line < 8) {
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port = 0x21;
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} else {
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port = 0xa1;
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line -= 8;
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}
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if (!status)
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value = inb(port) & ~((uint8_t)1 << line);
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else
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value = inb(port) | ((uint8_t)1 << line);
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outb(port, value);
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}
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void pic_mask_all(void) {
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outb(0xa1, 0xff);
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outb(0x21, 0xff);
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}
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