95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2011-2014 Kevin Lange
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* Copyright (C) 2015 Dale Weiler
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*
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* Interrupt Service Requests
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*/
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#include <kernel/system.h>
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#include <kernel/logging.h>
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#include <kernel/module.h>
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#include <kernel/printf.h>
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/* The count is treated as is when setting up IDT gates. However there is an
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* additional ISR for the system call vector which is handled explicitly since
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* it's mapped at a different address.
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*/
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#define ISR_COUNT 32
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static struct {
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size_t index;
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void (*stub)(void);
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} isrs[32 + 1] __attribute__((used));
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static irq_handler_t isr_routines[256] = { 0 };
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void isrs_install_handler(size_t isrs, irq_handler_t handler) {
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isr_routines[isrs] = handler;
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}
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void isrs_uninstall_handler(size_t isrs) {
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isr_routines[isrs] = 0;
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}
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void isrs_install(void) {
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char buffer[16];
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for (int i = 0; i < ISR_COUNT; i++) {
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sprintf(buffer, "_isr%d", i);
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isrs[i].index = i;
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isrs[i].stub = symbol_find(buffer);
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}
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isrs[ISR_COUNT].index = SYSCALL_VECTOR;
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isrs[ISR_COUNT].stub = symbol_find("_isr127");
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for (int i = 0; i < ISR_COUNT + 1; i++) {
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idt_set_gate(isrs[i].index, isrs[i].stub, 0x08, 0x8E);
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}
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}
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static const char *exception_messages[32] = {
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"Division by zero",
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"Debug",
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"Non-maskable interrupt",
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"Breakpoint",
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"Detected overflow",
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"Out-of-bounds",
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"Invalid opcode",
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"No coprocessor",
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"Double fault",
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"Coprocessor segment overrun",
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"Bad TSS",
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"Segment not present",
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"Stack fault",
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"General protection fault",
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"Page fault",
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"Unknown interrupt",
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"Coprocessor fault",
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"Alignment check",
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"Machine check",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved"
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};
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void fault_handler(struct regs * r) {
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irq_handler_t handler = isr_routines[r->int_no];
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if (handler) {
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handler(r);
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} else {
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debug_print(CRITICAL, "Unhandled exception: [%d] %s", r->int_no, exception_messages[r->int_no]);
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HALT_AND_CATCH_FIRE("Process caused an unhandled exception", r);
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STOP;
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}
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}
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