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https://github.com/gbowne1/ClassicOS.git
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8743fa9e24
- Makefile: fix linker script path - irq.c: `irqN()` stubs - irq.h: fix missing header - isr.h/isr.c extern `interrupt_handlers` - utils.c: remove duplicate `memcmp`
77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
#include "idt.h"
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#include "irq.h"
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#include "io.h"
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#include "isr.h"
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#define PIC1_CMD 0x20
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#define PIC1_DATA 0x21
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#define PIC2_CMD 0xA0
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#define PIC2_DATA 0xA1
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// FIXME: stubs
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void irq0() {}
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void irq1() {}
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void irq2() {}
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void irq3() {}
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void irq4() {}
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void irq5() {}
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void irq6() {}
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void irq7() {}
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void irq8() {}
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void irq9() {}
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void irq10() {}
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void irq11() {}
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void irq12() {}
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void irq13() {}
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void irq14() {}
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void irq15() {}
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// --- stubs end
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void irq_remap(void)
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{
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outb(PIC1_CMD, 0x11); // ICW1 – edge triggered, cascade, need ICW4
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outb(PIC2_CMD, 0x11);
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outb(PIC1_DATA, 0x20); // ICW2 – master base vector
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outb(PIC2_DATA, 0x28); // ICW2 – slave base vector
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outb(PIC1_DATA, 0x04); // ICW3 – slave on IRQ2
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outb(PIC2_DATA, 0x02); // ICW3 – cascade identity
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outb(PIC1_DATA, 0x01); // ICW4 – 8086 mode
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outb(PIC2_DATA, 0x01);
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// Mask everything except IRQ0 (timer) and IRQ1 (keyboard) for now
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outb(PIC1_DATA, 0b11111001);
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outb(PIC2_DATA, 0xFF);
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}
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void irq_install(void)
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{
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irq_remap();
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/* Fill IRQ entries in the IDT (0x20 … 0x2F) */
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//extern void irq0(), irq1(), irq2(), irq3(), irq4(), irq5(), irq6(), irq7();
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//extern void irq8(), irq9(), irq10(), irq11(), irq12(), irq13(), irq14(), irq15();
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idt_set_gate(0x20, (uint32_t)irq0);
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idt_set_gate(0x21, (uint32_t)irq1);
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/* … repeat for the rest or loop … */
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for (int i = 2; i < 16; ++i)
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idt_set_gate(0x20 + i, (uint32_t)irq0 + i * 8); // crude but works
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}
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/* Called from the assembly stubs (see irq.asm below) */
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void irq_handler(uint32_t int_num)
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{
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/* int_num is the *remapped* vector, e.g. 0x21 for keyboard */
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if (interrupt_handlers[int_num]) {
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interrupt_handlers[int_num]();
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}
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/* ---- EOI ---- */
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if (int_num >= 0x28) // slave PIC
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outb(PIC2_CMD, 0x20);
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outb(PIC1_CMD, 0x20); // always master
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}
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