50 lines
1.0 KiB
C++
50 lines
1.0 KiB
C++
/*
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* \brief Kernel backend for protection domains
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* \author Stefan Kalkowski
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* \date 2015-03-20
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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 <cpu.h>
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#include <kernel/pd.h>
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Genode::Cpu::Cpu()
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{
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if (primary_id() == executing_id()) {
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_idt = new (&_mt_idt) Idt();
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_idt->setup(Cpu::exception_entry);
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_tss = new (&_mt_tss) Tss();
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_tss->load();
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}
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_idt->load(Cpu::exception_entry);
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_tss->setup(Cpu::exception_entry);
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}
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void Genode::Cpu::Context::init(addr_t const table, bool core)
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{
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/* Constants to handle IF, IOPL values */
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enum {
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EFLAGS_IF_SET = 1 << 9,
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EFLAGS_IOPL_3 = 3 << 12,
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};
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cr3 = Cr3::init(table);
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/*
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* Enable interrupts for all threads, set I/O privilege level
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* (IOPL) to 3 for core threads to allow UART access.
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*/
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eflags = EFLAGS_IF_SET;
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if (core) eflags |= EFLAGS_IOPL_3;
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else Gdt::load(Cpu::exception_entry);
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}
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