77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
/*
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* Copyright (C) 2015, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "gdt.h"
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#include "helpers.h"
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#include "idt.h"
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#include "interrupt.h"
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#include "pic.h"
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#define IRQ7_INT PIC_INT(7)
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static void
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double_fault_handler(struct interrupt_context context)
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{
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halt();
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}
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/*---------------------------------------------------------------------------*/
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static void
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spurious_irq7_handler(void)
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{
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/*
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* NOTE: Originally IRQ7 was used for the parallel port interrupts. Nowadays,
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* though, it is only used if some other IRQ (i.e.: a PCIx interrupt) is
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* mapped to it. In this case we will have to check the PIC ISR register in
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* order to confirm this was a real interrupt.
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*
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* In case of a spurious interrupt, we should NEVER send an EOI here so the PIC
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* doesn't trigger the next queued interrupt.
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*/
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}
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/*---------------------------------------------------------------------------*/
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void
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cpu_init(void)
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{
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gdt_init();
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idt_init();
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/* Set an interrupt handler for Double Fault exception. This way, we avoid
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* the system to triple fault, leaving no trace about what happened.
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*/
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SET_INTERRUPT_HANDLER(8, 1, double_fault_handler);
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pic_init();
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/* Set a 'fake' handler for the Spurious IRQ7 interrupts.
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* Refer to http://wiki.osdev.org/PIC .
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*/
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SET_INTERRUPT_HANDLER(IRQ7_INT, 0, spurious_irq7_handler);
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}
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