diff options
Diffstat (limited to 'src/kernel/interrupts/irq.c')
| -rw-r--r-- | src/kernel/interrupts/irq.c | 87 |
1 files changed, 42 insertions, 45 deletions
diff --git a/src/kernel/interrupts/irq.c b/src/kernel/interrupts/irq.c index dd8ce90..f23e14a 100644 --- a/src/kernel/interrupts/irq.c +++ b/src/kernel/interrupts/irq.c @@ -35,80 +35,77 @@ extern void irq14(); extern void irq15(); // Array to handle custom IRQ handlers -void *irq_routines[16] = { - 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0 -}; +void *irq_routines[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; // Install custom IRQ handler void irq_install_handler(int irq, void (*handler)(struct regs *r)) { - irq_routines[irq] = handler; + irq_routines[irq] = handler; } // Removes the custom IRQ handler void irq_uninstall_handler(int irq) { - irq_routines[irq] = 0; + irq_routines[irq] = 0; } int irq_is_installed(int irq) { - return irq_routines[irq] != 0; + return irq_routines[irq] != 0; } // Remap IRQs for protected mode compatibility via the PIC void irq_remap(void) { - outb(0x20, 0x11); - outb(0xA0, 0x11); - outb(0x21, 0x20); - outb(0xA1, 0x28); - outb(0x21, 0x04); - outb(0xA1, 0x02); - outb(0x21, 0x01); - outb(0xA1, 0x01); - outb(0x21, 0x0); - outb(0xA1, 0x0); + outb(0x20, 0x11); + outb(0xA0, 0x11); + outb(0x21, 0x20); + outb(0xA1, 0x28); + outb(0x21, 0x04); + outb(0xA1, 0x02); + outb(0x21, 0x01); + outb(0xA1, 0x01); + outb(0x21, 0x0); + outb(0xA1, 0x0); } // Map ISRs to the correct entries in the IDT void irq_install() { - irq_remap(); - idt_set_gate(32, (unsigned) irq0, 0x08, 0x8E); - idt_set_gate(33, (unsigned) irq1, 0x08, 0x8E); - idt_set_gate(34, (unsigned) irq2, 0x08, 0x8E); - idt_set_gate(35, (unsigned) irq3, 0x08, 0x8E); - idt_set_gate(36, (unsigned) irq4, 0x08, 0x8E); - idt_set_gate(37, (unsigned) irq5, 0x08, 0x8E); - idt_set_gate(38, (unsigned) irq6, 0x08, 0x8E); - idt_set_gate(39, (unsigned) irq7, 0x08, 0x8E); - idt_set_gate(40, (unsigned) irq8, 0x08, 0x8E); - idt_set_gate(41, (unsigned) irq9, 0x08, 0x8E); - idt_set_gate(42, (unsigned) irq10, 0x08, 0x8E); - idt_set_gate(43, (unsigned) irq11, 0x08, 0x8E); - idt_set_gate(44, (unsigned) irq12, 0x08, 0x8E); - idt_set_gate(45, (unsigned) irq13, 0x08, 0x8E); - idt_set_gate(46, (unsigned) irq14, 0x08, 0x8E); - idt_set_gate(47, (unsigned) irq15, 0x08, 0x8E); - vga_log("Installed Interrupt Requests"); + irq_remap(); + idt_set_gate(32, (unsigned)irq0, 0x08, 0x8E); + idt_set_gate(33, (unsigned)irq1, 0x08, 0x8E); + idt_set_gate(34, (unsigned)irq2, 0x08, 0x8E); + idt_set_gate(35, (unsigned)irq3, 0x08, 0x8E); + idt_set_gate(36, (unsigned)irq4, 0x08, 0x8E); + idt_set_gate(37, (unsigned)irq5, 0x08, 0x8E); + idt_set_gate(38, (unsigned)irq6, 0x08, 0x8E); + idt_set_gate(39, (unsigned)irq7, 0x08, 0x8E); + idt_set_gate(40, (unsigned)irq8, 0x08, 0x8E); + idt_set_gate(41, (unsigned)irq9, 0x08, 0x8E); + idt_set_gate(42, (unsigned)irq10, 0x08, 0x8E); + idt_set_gate(43, (unsigned)irq11, 0x08, 0x8E); + idt_set_gate(44, (unsigned)irq12, 0x08, 0x8E); + idt_set_gate(45, (unsigned)irq13, 0x08, 0x8E); + idt_set_gate(46, (unsigned)irq14, 0x08, 0x8E); + idt_set_gate(47, (unsigned)irq15, 0x08, 0x8E); + vga_log("Installed Interrupt Requests"); } // Handle IRQ ISRs void irq_handler(struct regs *r) { - void (*handler)(struct regs *r); + void (*handler)(struct regs * r); - // Execute custom handler if exists - handler = irq_routines[r->int_no - 32]; - if (handler) - handler(r); + // Execute custom handler if exists + handler = irq_routines[r->int_no - 32]; + if (handler) + handler(r); - // Send end of interrupt to second (slave) IRQ controller - if (r->int_no >= 40) - outb(0xA0, 0x20); + // Send end of interrupt to second (slave) IRQ controller + if (r->int_no >= 40) + outb(0xA0, 0x20); - // Send end of interrupt to master interrupt controller - outb(0x20, 0x20); + // Send end of interrupt to master interrupt controller + outb(0x20, 0x20); }
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