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sortix--sortix/kernel/x86-family/idt.h
2014-03-17 19:22:13 +01:00

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
This file is part of Sortix.
Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
You should have received a copy of the GNU General Public License along with
Sortix. If not, see <http://www.gnu.org/licenses/>.
x86-family/idt.h
Initializes and handles the IDT.
*******************************************************************************/
#ifndef SORTIX_X86_FAMILY_IDT_H
#define SORTIX_X86_FAMILY_IDT_H
#include <stdint.h>
namespace Sortix {
namespace IDT {
struct idt_entry
{
uint16_t handler_low;
uint16_t selector;
uint8_t ist;
uint8_t flags;
uint16_t handler_high;
#if defined(__x86_64__)
uint32_t handler_highest;
uint32_t reserved1;
#endif
};
static const uint8_t FLAG_PRESENT = 1 << 7;
static const uint8_t FLAG_DPL_SHIFT = 5;
static const uint8_t FLAG_DPL_BITS = 2;
static const uint8_t FLAG_TYPE_SHIFT = 0;
static const uint8_t FLAG_TYPE_BITS = 4;
static const uint8_t TYPE_INTERRUPT = 0xE;
static const uint8_t TYPE_TRAP = 0xF;
void Set(struct idt_entry* table, size_t length);
void SetEntry(struct idt_entry* entry, uintptr_t handler, uint16_t selector,
uint8_t flags, uint8_t ist);
} // namespace IDT
} // namespace Sortix
#endif