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https://gitlab.com/sortix/sortix.git
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81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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x86-family/idt.cpp
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Initializes and handles the interrupt descriptor table.
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*******************************************************************************/
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#include <stdint.h>
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#include <string.h>
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#include "idt.h"
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namespace Sortix {
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namespace IDT {
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struct idt_entry
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{
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uint16_t handler_low;
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uint16_t sel;
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uint8_t reserved0;
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uint8_t flags;
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uint16_t handler_high;
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#if defined(__x86_64__)
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uint32_t handler_highest;
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uint32_t reserved1;
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#endif
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};
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struct idt_ptr
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{
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uint16_t limit;
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#if defined(__x86_64__)
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uint64_t idt_ptr;
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#else
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uint32_t idt_ptr;
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#endif
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} __attribute__((packed));
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static struct idt_entry idt_entries[256];
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void Init()
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{
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volatile struct idt_ptr ptr;
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ptr.limit = sizeof(idt_entries) - 1;
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ptr.idt_ptr = (unsigned long) &idt_entries;
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asm volatile ("lidt (%0)" : : "r"(&ptr));
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memset(&idt_entries, 0, sizeof(idt_entries));
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}
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void SetEntry(uint8_t num, uintptr_t handler, uint16_t sel, uint8_t flags)
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{
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idt_entries[num].flags = flags;
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idt_entries[num].reserved0 = 0;
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idt_entries[num].sel = sel;
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idt_entries[num].handler_low = handler >> 0 & 0xFFFF;
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idt_entries[num].handler_high = handler >> 16 & 0xFFFF;
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#if defined(__x86_64__)
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idt_entries[num].handler_highest = handler >> 32 & 0xFFFFFFFFU;
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idt_entries[num].reserved1 = 0;
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#endif
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}
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} // namespace IDT
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} // namespace Sortix
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