4723b08322
'Page_flags' maps application-specific memory attributes to the TLB-specific memory attributes. Thereby it avoids functions with lots of parameters, by declaring appropriate bitfields on a single POD value.
120 lines
2.8 KiB
C++
120 lines
2.8 KiB
C++
/*
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* \brief Driver for ARMv7 section tables
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* \author Martin Stein
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* \date 2012-02-22
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*/
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/*
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* Copyright (C) 2012 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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#ifndef _INCLUDE__ARM_V7__SECTION_TABLE_H_
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#define _INCLUDE__ARM_V7__SECTION_TABLE_H_
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/* core includes */
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#include <arm/section_table.h>
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#include <arm/v7/cpu.h>
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namespace Arm_v7
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{
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using namespace Genode;
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/**
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* ARMv7 first level translation table
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*/
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class Section_table : public Arm::Section_table
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{
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public:
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/**
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* Link to second level translation-table
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*/
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struct Page_table_descriptor : Arm::Section_table::Page_table_descriptor
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{
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struct Ns : Bitfield<3, 1> { }; /* non-secure bit */
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/**
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* Compose descriptor value
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*/
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static access_t create(Arm::Page_table * const pt,
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Section_table * const st)
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{
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return Arm::Section_table::Page_table_descriptor::create(pt) |
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Ns::bits(!st->secure());
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}
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};
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/**
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* Section translation descriptor
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*/
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struct Section : Arm::Section_table::Section
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{
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struct Ns : Bitfield<19, 1> { }; /* non-secure bit */
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/**
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* Compose descriptor value
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*/
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static access_t create(Arm::page_flags_t const flags,
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addr_t const pa,
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Section_table * const st)
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{
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return Arm::Section_table::Section::create(flags, pa) |
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Ns::bits(!st->secure());
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}
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};
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protected:
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/* if this table is dedicated to secure mode or to non-secure mode */
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bool _secure;
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public:
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/**
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* Constructor
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*/
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Section_table() : _secure(Arm_v7::Cpu::secure_mode()) { }
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/**
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* Insert one atomic translation into this table
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*
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* For details see 'Arm::Section_table::insert_translation'
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*/
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unsigned long
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insert_translation(addr_t const vo, addr_t const pa,
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unsigned long const size_log2,
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Arm::page_flags_t const flags,
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void * const extra_space = 0) {
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return Arm::Section_table::
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insert_translation<Section_table>(vo, pa, size_log2, flags,
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this, extra_space); }
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/**
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* Insert translations for given area, do not permit displacement
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*
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* \param vo virtual offset within this table
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* \param s area size
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* \param io_mem wether the area maps MMIO
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*/
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void map_core_area(addr_t vo, size_t s, bool const io_mem) {
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Arm::Section_table::map_core_area<Section_table>(vo, s, io_mem,
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this); }
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/***************
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** Accessors **
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***************/
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bool secure() { return _secure; }
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};
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}
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bool Arm::cache_support() { return 1; }
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#endif /* _INCLUDE__ARM_V7__SECTION_TABLE_H_ */
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