71 lines
1.4 KiB
C++
71 lines
1.4 KiB
C++
/*
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* \brief Transtaltion lookaside buffer
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* \author Martin Stein
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* \date 2012-04-23
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*/
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/*
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* Copyright (C) 2012-2013 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 _PANDA__TLB_H_
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#define _PANDA__TLB_H_
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/* core includes */
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#include <board.h>
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#include <tlb/arm_v7.h>
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namespace Genode
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{
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class Tlb : public Arm_v7::Section_table { };
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/**
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* Transtaltion lookaside buffer of core
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*/
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class Core_tlb : public Tlb
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{
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private:
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/**
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* On Pandaboard the L2 cache needs to be disabled by a
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* TrustZone hypervisor call
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*/
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void _disable_outer_l2_cache()
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{
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asm volatile (
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"stmfd sp!, {r0-r12} \n"
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"mov r0, #0 \n"
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"ldr r12, =0x102 \n"
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"dsb \n"
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"smc #0 \n"
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"ldmfd sp!, {r0-r12}");
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}
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public:
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/**
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* Constructor - ensures that core never gets a pagefault
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*/
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Core_tlb()
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{
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using namespace Genode;
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/*
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* Disable L2-cache by now, or we get into deep trouble with the MMU
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* not using the L2 cache
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*/
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_disable_outer_l2_cache();
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map_core_area(Board::RAM_0_BASE, Board::RAM_0_SIZE, 0);
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map_core_area(Board::MMIO_0_BASE, Board::MMIO_0_SIZE, 1);
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map_core_area(Board::MMIO_1_BASE, Board::MMIO_1_SIZE, 1);
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}
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};
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}
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#endif /* _PANDA__TLB_H_ */
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