A poorly written OS for the x86 arch. (WIP)
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#include "../lib/types.h"
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#include "io.h"
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// master
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#define PIC1 0x20
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#define PIC1_CMD PIC1
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#define PIC1_DATA (PIC1+1)
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// slave
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#define PIC2 0xa0
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#define PIC2_CMD PIC2
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#define PIC2_DATA (PIC2+1)
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// ICWx
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#define ICW1_ICW4 0x01
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#define ICW1_SINGLE 0x02
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#define ICW1_INTERVAL4 0x04
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#define ICW1_LEVEL 0x08
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#define ICW1_INIT 0x10
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#define ICW4_8086 0x01
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#define ICW4_AUTO 0x02
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#define ICW4_BUF_SLAVE 0x08
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#define ICW4_BUF_MASTER 0x0C
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#define ICW4_SFNM 0x10
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#define ICW_INIT_MASK (ICW1_INIT | ICW1_ICW4)
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// ISR & IRR
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#define PIC_R_IRR 0x0a
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#define PIC_R_ISR 0x0b
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// Ints
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#define PIC_EOI 0x20 // End-of-interupt
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// PIC
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void pic_send_eoi(uint8);
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void pic_remap(uint, uint);
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void pic_disable();
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// IRQs
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void irq(uint8, bool);
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static uint16 irq_reg(int ocw3);
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