35 lines
899 B
C
35 lines
899 B
C
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#include "rtc.h"
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#include "internal.h"
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#include "../pic.h"
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#include "../internal.h"
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#include "../../../../main.h"
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#include "../../../../runtime/panic_assert.h"
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#include "../../../../interrupt/interrupt.h"
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bool pic_rtc_Enabled;
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void pic_rtc_Init() {
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assert(irq_pic_Enabled && "pic/rtc requires pic to be enabled");
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if (pic_rtc_Enabled)
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return;
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INTERRUPT_DISABLE;
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outb(0x70, 0x8b); // select register B, and disable NMI
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uint8_t prev = inb(0x71); // read the current value of register B
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outb(0x70, 0x8B); // set the index again (a read will reset the index to register D)
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outb(0x71, prev | 0x40); // write the previous value ORed with 0x40. This turns on bit 6 of register B
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irq_pic_IRQHandlerRaw[8] = __pic_rtc_IRQ8;
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irq_pic_Mask(8, false);
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pic_rtc_Enabled = true;
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INTERRUPT_RESTORE;
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}
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void pic_rtc_SetHandler(void *handler) {
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__pic_rtc_IRQHandler = handler;
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}
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