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https://gitlab.com/sortix/sortix.git
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65 lines
2 KiB
C++
65 lines
2 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
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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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void Set(struct idt_entry* table, size_t length)
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{
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size_t limit = sizeof(idt_entry) * length - 1;
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#if defined(__x86_64__)
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asm volatile ("subq $10, %%rsp\n\t"
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"movw %w0, 0(%%rsp)\n\t"
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"movq %1, 2(%%rsp)\n\t"
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"lidt (%%rsp)\n\t"
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"addq $10, %%rsp" : : "rN"(limit), "r"(table));
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#else
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asm volatile ("subl $6, %%esp\n\t"
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"movw %w0, 0(%%esp)\n\t"
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"movl %1, 2(%%esp)\n\t"
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"lidt (%%esp)\n\t"
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"addl $6, %%esp" : : "rN"(limit), "r"(table));
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#endif
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}
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void SetEntry(struct idt_entry* entry, uintptr_t handler, uint16_t selector, uint8_t flags, uint8_t ist)
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{
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entry->flags = flags;
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entry->ist = ist;
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entry->selector = selector;
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entry->handler_low = handler >> 0 & 0xFFFF;
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entry->handler_high = handler >> 16 & 0xFFFF;
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#if defined(__x86_64__)
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entry->handler_highest = handler >> 32 & 0xFFFFFFFFU;
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entry->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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