47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
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#ifndef PIC_H
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#define PIC_H
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#include "hos_types.h"
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#include "portio.h"
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#define PIC1 0x20
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#define PIC2 0xA0
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#define PIC1_COMMAND PIC1
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#define PIC1_DATA (PIC1+1)
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#define PIC2_COMMAND PIC2
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#define PIC2_DATA (PIC2+1)
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#define PIC_EOI 0x20
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#define ICW1_ICW4 0x01 /* ICW4 (not) needed */
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#define ICW1_SINGLE 0x02 /* Single (cascade) mode */
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#define ICW1_INTERVAL4 0x04 /* Call address interval 4 (8) */
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#define ICW1_LEVEL 0x08 /* Level triggered (edge) mode */
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#define ICW1_INIT 0x10 /* Initialization - required! */
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#define ICW4_8086 0x01 /* 8086/88 (MCS-80/85) mode */
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#define ICW4_AUTO 0x02 /* Auto (normal) EOI */
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#define ICW4_BUF_SLAVE 0x08 /* Buffered mode/slave */
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#define ICW4_BUF_MASTER 0x0C /* Buffered mode/master */
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#define ICW4_SFNM 0x10 /* Special fully nested (not) */
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void pic_remap(u8_t base1, u8_t base2);
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/* Masks interrupts on first Programmable Interrupt Controller */
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#define pic_mask1(mask) outportb(PIC1_DATA, mask) /* 0x21, maskfield *OCW1* */
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/* Masks interrupts on second Programmable Interrupt Controller */
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#define pic_mask2(mask) outportb(PIC2_DATA, mask) /* 0xA1, maskfield *OCW1* */
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/* Signals an End Of Interrupt signal to the first PIC */
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#define pic_eoi() outportb(0x20, 0x20)
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/* Signals an End Of Interrupt signal to both the second and first PIC unit */
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static inline void pic_eoi2()
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{
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outportb(0xA0, 0x20);
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outportb(0x20, 0x20);
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}
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#endif
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