53 lines
1.2 KiB
C++
53 lines
1.2 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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void Genode::Cpu::init_virt_kernel(Kernel::Pd * pd)
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{
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/*
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* Please do not remove the PINF(), because the serial constructor requires
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* access to the Bios Data Area, which is available in the initial
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* translation table set, but not in the final tables used after
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* Cr3::write().
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*/
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PINF("Switch to core's final translation table");
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Cr3::write(Cr3::init((addr_t)pd->translation_table()));
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}
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void Genode::Cpu::_init_fpu()
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{
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Cr0::access_t cr0_value = Cr0::read();
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Cr4::access_t cr4_value = Cr4::read();
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Cr0::Mp::set(cr0_value);
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Cr0::Em::clear(cr0_value);
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Cr0::Ts::set(cr0_value);
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Cr0::Ne::set(cr0_value);
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Cr0::write(cr0_value);
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Cr4::Osfxsr::set(cr4_value);
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Cr4::Osxmmexcpt::set(cr4_value);
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Cr4::write(cr4_value);
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}
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void Genode::Cpu::_disable_fpu() { Cr0::write(Cr0::read() | Cr0::Ts::bits(1)); }
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bool Genode::Cpu::_fpu_enabled() { return !Cr0::Ts::get(Cr0::read()); }
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