53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
/*
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* \brief Interrupt Descriptor Table (IDT)
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* \author Adrian-Ken Rueegsegger
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* \author Reto Buerki
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* \date 2015-02-13
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*/
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/*
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* Copyright (C) 2015 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* core includes */
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#include <pseudo_descriptor.h>
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#include <mtc_util.h>
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#include <idt.h>
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extern int _mt_idt;
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extern int _mt_isrs;
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using namespace Genode;
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void Idt::setup(addr_t const virt_base)
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{
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addr_t base = _virt_mtc_addr(virt_base, (addr_t)&_mt_isrs);
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addr_t isr_addr;
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for (unsigned vec = 0; vec < SIZE_IDT; vec++) {
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/* ISRs are padded to 4 bytes */
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isr_addr = base + vec * 0xc;
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_table[vec].offset_15_00 = isr_addr & 0xffff;
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_table[vec].segment_sel = 8;
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_table[vec].flags = 0x8e00;
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_table[vec].offset_31_16 = (isr_addr >> 16);
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_table[vec].offset_63_32 = (isr_addr >> 32);
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}
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/* Set DPL of syscall entry to 3 */
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_table[SYSCALL_VEC].flags = _table[SYSCALL_VEC].flags | 0x6000;
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}
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void Idt::load(addr_t const virt_base)
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{
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uint16_t const limit = sizeof(_table) - 1;
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uint64_t const base = _virt_mtc_addr(virt_base, (addr_t)&_mt_idt);
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asm volatile ("lidt %0" : : "m" (Pseudo_descriptor(limit, base)));
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}
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