113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
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#include "pic.h"
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#include "internal.h"
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#include "../../../runtime/panic_assert.h"
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#include "../../../interrupt/interrupt.h"
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#include "../../../runtime/stdio.h"
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#include <string.h>
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irq_pic_IRQHandlerType irq_pic_IRQHandler[16];
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uintptr_t irq_pic_IRQHandler_Data[16];
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void * irq_pic_IRQHandlerRaw[16];
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bool irq_pic_Enabled;
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void irq_pic_Init() {
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assert(interrupt_Enabled && "Interrupt must be set up before PIC init");
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INTERRUPT_DISABLE;
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outb_wait(PIC1_DATA, 0xff); // mask all IRQs
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outb_wait(PIC2_DATA, 0xff);
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outb_wait(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4);
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outb_wait(PIC1_DATA, IRQ_PIC_INT_OFFSET_MASTER); // ICW2: Master PIC interrupt vector offset
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outb_wait(PIC1_DATA, 4); // ICW3: tell Master PIC that there is a slave PIC at IRQ2
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outb_wait(PIC1_DATA, ICW4_8086);
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outb_wait(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
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outb_wait(PIC2_DATA, IRQ_PIC_INT_OFFSET_SLAVE); // ICW2: Slave PIC interrupt vector offset
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outb_wait(PIC2_DATA, 2); // ICW3: tell Slave PIC its cascade identity
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outb_wait(PIC2_DATA, ICW4_8086);
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outb_wait(PIC1_DATA, 0xfb); // mask all IRQs except IRQ2 (for slave)
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outb_wait(PIC2_DATA, 0xff);
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memset(irq_pic_IRQHandler, 0, sizeof(irq_pic_IRQHandler)); // reset all IRQ handlers
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memset(irq_pic_IRQHandlerRaw, 0, sizeof(irq_pic_IRQHandlerRaw));
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// map the IRQ handlers
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interrupt_MapHandler(irq_pic_IntHandler20h, 0x20);
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interrupt_MapHandler(irq_pic_IntHandler21h, 0x21);
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interrupt_MapHandler(irq_pic_IntHandler22h, 0x22);
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interrupt_MapHandler(irq_pic_IntHandler23h, 0x23);
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interrupt_MapHandler(irq_pic_IntHandler24h, 0x24);
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interrupt_MapHandler(irq_pic_IntHandler25h, 0x25);
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interrupt_MapHandler(irq_pic_IntHandler26h, 0x26);
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interrupt_MapHandler(irq_pic_IntHandler27h, 0x27);
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interrupt_MapHandler(irq_pic_IntHandler28h, 0x28);
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interrupt_MapHandler(irq_pic_IntHandler29h, 0x29);
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interrupt_MapHandler(irq_pic_IntHandler2ah, 0x2a);
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interrupt_MapHandler(irq_pic_IntHandler2bh, 0x2b);
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interrupt_MapHandler(irq_pic_IntHandler2ch, 0x2c);
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interrupt_MapHandler(irq_pic_IntHandler2dh, 0x2d);
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interrupt_MapHandler(irq_pic_IntHandler2eh, 0x2e);
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interrupt_MapHandler(irq_pic_IntHandler2fh, 0x2f);
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irq_pic_Enabled = true;
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INTERRUPT_RESTORE;
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}
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void irq_pic_InitRemap(int offset_master, int offset_slave) {
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uint8_t a1, a2; // existing PIC masks
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a1 = inb(PIC1_DATA);
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a2 = inb(PIC2_DATA);
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outb_wait(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4);
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outb_wait(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
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outb_wait(PIC1_DATA, offset_master); // ICW2: Master PIC interrupt vector offset
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outb_wait(PIC2_DATA, offset_slave); // ICW2: Slave PIC interrupt vector offset
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outb_wait(PIC1_DATA, 4); // ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
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outb_wait(PIC2_DATA, 2); // ICW3: tell Slave PIC its cascade identity (0000 0010)
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outb_wait(PIC1_DATA, ICW4_8086);
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outb_wait(PIC2_DATA, ICW4_8086);
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outb_wait(PIC1_DATA, a1); // restore saved masks
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outb_wait(PIC2_DATA, a1);
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}
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void irq_pic_Mask(uint8_t irq_line, bool masked) {
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uint16_t port;
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if (irq_line < 8)
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port = PIC1_DATA;
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else {
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port = PIC2_DATA;
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irq_line -= 8;
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}
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if (masked)
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outb(port, inb(port) | (1 << irq_line));
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else
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outb(port, inb(port) & ~(1 << irq_line));
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}
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static inline uint16_t __irq_pic_GetRegister(uint8_t ocw3) {
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/* OCW3 to PIC CMD to get the register values. PIC2 is chained, and
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* represents IRQs 8-15. PIC1 is IRQs 0-7, with 2 being the chain */
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outb_wait(PIC1_COMMAND, ocw3);
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outb_wait(PIC2_COMMAND, ocw3);
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return ((uint16_t)inb(PIC2_COMMAND) << 8) | inb(PIC1_COMMAND);
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}
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uint16_t irq_pic_GetIRR() {
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return __irq_pic_GetRegister(0x0a); // OCW3 Command: Read IRR
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}
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uint16_t irq_pic_GetISR() {
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return __irq_pic_GetRegister(0x0b); // OCW3 Command: Read ISR
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}
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