diff options
Diffstat (limited to 'kernel/drivers/interrupts.c')
| -rw-r--r-- | kernel/drivers/interrupts.c | 261 |
1 files changed, 0 insertions, 261 deletions
diff --git a/kernel/drivers/interrupts.c b/kernel/drivers/interrupts.c deleted file mode 100644 index 39a59a0..0000000 --- a/kernel/drivers/interrupts.c +++ /dev/null @@ -1,261 +0,0 @@ -// MIT License, Copyright (c) 2020 Marvin Borner -// TODO: Remove some magic numbers - -#include <assert.h> -#include <def.h> -#include <drivers/cpu.h> -#include <drivers/interrupts.h> -#include <drivers/serial.h> -#include <mem.h> -#include <mm.h> -#include <print.h> -#include <proc.h> - -/** - * IDT - */ - -PROTECTED static struct idt_entry idt[256] = { 0 }; -PROTECTED static struct idt_ptr idt_ptr = { 0 }; - -CLEAR void idt_set_gate(u8 num, u32 base, u16 sel, u8 flags) -{ - // Specify the interrupt routine's base address - idt[num].base_low = (u16)(base & 0xffff); - idt[num].base_high = (u16)((base >> 16) & 0xffff); - - // Set selector/segment of IDT entry - idt[num].sel = sel; - idt[num].always0 = 0; - idt[num].flags = flags; -} - -// Install IDT -CLEAR static void idt_install(void) -{ - // Set IDT pointer and limit - idt_ptr.limit = sizeof(idt) - 1; - idt_ptr.base = &idt; - - // Clear IDT by setting memory cells to 0 - memset(&idt, 0, sizeof(idt)); - - __asm__ volatile("lidt %0" : : "m"(idt_ptr)); -} - -/** - * IRQ - */ - -PROTECTED static void (*irq_routines[16])(struct regs *) = { 0 }; - -// Install IRQ handler -CLEAR void irq_install_handler(int irq, void (*handler)(struct regs *r)) -{ - irq_routines[irq] = handler; -} - -// Remove IRQ handler -CLEAR void irq_uninstall_handler(int irq) -{ - irq_routines[irq] = 0; -} - -// Remap the IRQ table -CLEAR static 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, 0x00); - outb(0xa1, 0x00); -} - -// Handle IRQ ISRs -void irq_handler(struct regs *r); -void irq_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); - - // Send EOI to second (slave) PIC - if (r->int_no >= 40) - outb(0xa0, 0x20); - - // Send EOI to master PIC - outb(0x20, 0x20); -} - -// Map ISRs to the correct entries in the IDT -CLEAR static void irq_install(void) -{ - irq_remap(); - - idt_set_gate(32, (u32)irq0, 0x08, 0x8e); - idt_set_gate(33, (u32)irq1, 0x08, 0x8e); - idt_set_gate(34, (u32)irq2, 0x08, 0x8e); - idt_set_gate(35, (u32)irq3, 0x08, 0x8e); - idt_set_gate(36, (u32)irq4, 0x08, 0x8e); - idt_set_gate(37, (u32)irq5, 0x08, 0x8e); - idt_set_gate(38, (u32)irq6, 0x08, 0x8e); - idt_set_gate(39, (u32)irq7, 0x08, 0x8e); - - idt_set_gate(40, (u32)irq8, 0x08, 0x8e); - idt_set_gate(41, (u32)irq9, 0x08, 0x8e); - idt_set_gate(42, (u32)irq10, 0x08, 0x8e); - idt_set_gate(43, (u32)irq11, 0x08, 0x8e); - idt_set_gate(44, (u32)irq12, 0x08, 0x8e); - idt_set_gate(45, (u32)irq13, 0x08, 0x8e); - idt_set_gate(46, (u32)irq14, 0x08, 0x8e); - idt_set_gate(47, (u32)irq15, 0x08, 0x8e); -} - -/** - * ISR - */ - -PROTECTED static void (*isr_routines[256])(struct regs *) = { 0 }; - -PROTECTED const char *isr_exceptions[32] = { - "Division By Zero", - "Debug", - "Non Maskable Interrupt", - "Breakpoint", - "Into Detected Overflow", - "Out of Bounds", - "Invalid Opcode", - "No Coprocessor", - - "Double Fault", - "Coprocessor Segment Overrun", - "Bad TSS", - "Segment Not Present", - "Stack Fault", - "General Protection Fault", - "Page Fault", - "Unknown Interrupt", - - "Coprocessor Fault", - "Alignment Check", - "Machine Check", - "Reserved", - "Reserved", - "Reserved", - "Reserved", - "Reserved", - - "Reserved", - "Reserved", - "Reserved", - "Reserved", - "Reserved", - "Reserved", - "Reserved", - "Reserved", -}; - -CLEAR void isr_install_handler(int isr, void (*handler)(struct regs *r)) -{ - isr_routines[isr] = handler; -} - -CLEAR void isr_uninstall_handler(int isr) -{ - isr_routines[isr] = 0; -} - -void isr_panic(struct regs *r) -{ - printf("%s Exception (code %x) at 0x%x (ring %d), exiting!\n", isr_exceptions[r->int_no], - r->err_code, r->eip, RING(r)); - struct proc *proc = proc_current(); - if (proc) { - printf("\t-> Exception occurred in %s at addr 0x%x (offset 0x%x)\n", proc->name, - r->eip, r->eip - proc->entry); - printf("\t\t-> Process: [entry: %x, kstack: %x, esp %x, ustack: %x, uesp %x]\n", - proc->entry, proc->stack.kernel, r->esp, proc->stack.user, r->useresp); - proc_exit(proc, r, 1); - } else { - __asm__ volatile("cli\nhlt"); - } - proc_yield_regs(r); -} - -void isr_handler(struct regs *r); -void isr_handler(struct regs *r) -{ - assert(r->int_no < sizeof(isr_routines)); - - // Execute fault handler if exists - void (*handler)(struct regs * r) = isr_routines[r->int_no]; - if (handler) - handler(r); - else - isr_panic(r); -} - -CLEAR static void isr_install(void) -{ - idt_set_gate(0, (u32)isr0, 0x08, 0x8e); - idt_set_gate(1, (u32)isr1, 0x08, 0x8e); - idt_set_gate(2, (u32)isr2, 0x08, 0x8e); - idt_set_gate(3, (u32)isr3, 0x08, 0x8e); - idt_set_gate(4, (u32)isr4, 0x08, 0x8e); - idt_set_gate(5, (u32)isr5, 0x08, 0x8e); - idt_set_gate(6, (u32)isr6, 0x08, 0x8e); - idt_set_gate(7, (u32)isr7, 0x08, 0x8e); - - idt_set_gate(8, (u32)isr8, 0x08, 0x8e); - idt_set_gate(9, (u32)isr9, 0x08, 0x8e); - idt_set_gate(10, (u32)isr10, 0x08, 0x8e); - idt_set_gate(11, (u32)isr11, 0x08, 0x8e); - idt_set_gate(12, (u32)isr12, 0x08, 0x8e); - idt_set_gate(13, (u32)isr13, 0x08, 0x8e); - idt_set_gate(14, (u32)isr14, 0x08, 0x8e); - idt_set_gate(15, (u32)isr15, 0x08, 0x8e); - - idt_set_gate(16, (u32)isr16, 0x08, 0x8e); - idt_set_gate(17, (u32)isr17, 0x08, 0x8e); - idt_set_gate(18, (u32)isr18, 0x08, 0x8e); - idt_set_gate(19, (u32)isr19, 0x08, 0x8e); - idt_set_gate(20, (u32)isr20, 0x08, 0x8e); - idt_set_gate(21, (u32)isr21, 0x08, 0x8e); - idt_set_gate(22, (u32)isr22, 0x08, 0x8e); - idt_set_gate(23, (u32)isr23, 0x08, 0x8e); - - idt_set_gate(24, (u32)isr24, 0x08, 0x8e); - idt_set_gate(25, (u32)isr25, 0x08, 0x8e); - idt_set_gate(26, (u32)isr26, 0x08, 0x8e); - idt_set_gate(27, (u32)isr27, 0x08, 0x8e); - idt_set_gate(28, (u32)isr28, 0x08, 0x8e); - idt_set_gate(29, (u32)isr29, 0x08, 0x8e); - idt_set_gate(30, (u32)isr30, 0x08, 0x8e); - idt_set_gate(31, (u32)isr31, 0x08, 0x8e); - - // Set default routines - for (u32 i = 0; i < 256; i++) - isr_routines[i] = isr_panic; - - // Set page fault handler - isr_install_handler(14, page_fault_handler); -} - -/** - * Combined - */ - -CLEAR void interrupts_install(void) -{ - idt_install(); - isr_install(); - irq_install(); -} |