78 lines
2.6 KiB
C++
78 lines
2.6 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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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.h
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Initializes and handles the IDT.
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*******************************************************************************/
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#ifndef SORTIX_X86_FAMILY_IDT_H
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#define SORTIX_X86_FAMILY_IDT_H
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namespace Sortix
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{
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namespace IDT
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{
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// A struct describing an interrupt gate.
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struct idt_entry32_struct
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{
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uint16_t base_low; // The lower 16 bits of the address to jump to when this interrupt fires.
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uint16_t sel; // Kernel segment selector.
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uint8_t always0; // This must always be zero.
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uint8_t flags; // More flags. See documentation.
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uint16_t base_high; // The upper 16 bits of the address to jump to.
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} __attribute__((packed));
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struct idt_entry64_struct
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{
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uint16_t base_low; // The lower 16 bits of the address to jump to when this interrupt fires.
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uint16_t sel; // Kernel segment selector.
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uint8_t always0; // This must always be zero.
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uint8_t flags; // More flags. See documentation.
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uint16_t base_high; // The upper 16 bits of the address to jump to.
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uint32_t base_highest;
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uint32_t zero1; // Reserved
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} __attribute__((packed));
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typedef struct idt_entry32_struct idt_entry32_t;
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typedef struct idt_entry64_struct idt_entry64_t;
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#ifdef PLATFORM_X64
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typedef idt_entry64_t idt_entry_t;
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#else
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typedef idt_entry32_t idt_entry_t;
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#endif
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// A struct describing a pointer to an array of interrupt handlers.
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// This is in a format suitable for giving to 'lidt'.
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struct idt_ptr_struct
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{
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uint16_t limit;
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addr_t base; // The address of the first element in our idt_entry_t array.
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} __attribute__((packed));
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typedef struct idt_ptr_struct idt_ptr_t;
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void Init();
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void SetGate(uint8_t num, addr_t base, uint16_t sel, uint8_t flags);
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void Flush();
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}
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}
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#endif
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