132 lines
4.7 KiB
C
132 lines
4.7 KiB
C
/*
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* Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <platform.h>
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#include <tzc400.h>
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#include <debug.h>
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/* Used to improve readability for configuring regions. */
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#define FILTER_SHIFT(filter) (1 << filter)
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/*
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* For the moment we assume that all security programming is done by the
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* primary core.
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* TODO:
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* Might want to enable interrupt on violations when supported?
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*/
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void plat_security_setup(void)
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{
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struct tzc_instance controller;
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/*
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* The Base FVP has a TrustZone address space controller, the Foundation
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* FVP does not. Trying to program the device on the foundation FVP will
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* cause an abort.
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*
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* If the platform had additional peripheral specific security
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* configurations, those would be configured here.
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*/
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if (!platform_get_cfgvar(CONFIG_HAS_TZC))
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return;
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/*
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* The TrustZone controller controls access to main DRAM. Give
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* full NS access for the moment to use with OS.
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*/
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INFO("Configuring TrustZone Controller\n");
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/*
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* The driver does some error checking and will assert.
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* - Provide base address of device on platform.
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* - Provide width of ACE-Lite IDs on platform.
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*/
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controller.base = TZC400_BASE;
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controller.aid_width = FVP_AID_WIDTH;
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tzc_init(&controller);
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/*
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* Currently only filters 0 and 2 are connected on Base FVP.
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* Filter 0 : CPU clusters (no access to DRAM by default)
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* Filter 1 : not connected
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* Filter 2 : LCDs (access to VRAM allowed by default)
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* Filter 3 : not connected
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* Programming unconnected filters will have no effect at the
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* moment. These filter could, however, be connected in future.
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* So care should be taken not to configure the unused filters.
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*/
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/* Disable all filters before programming. */
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tzc_disable_filters(&controller);
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/*
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* Allow full access to all DRAM to supported devices for the
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* moment. Give access to the CPUs and Virtio. Some devices
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* would normally use the default ID so allow that too. We use
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* three different regions to cover the three separate blocks of
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* memory in the FVPs. We allow secure access to DRAM to load NS
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* software.
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* FIXME: In current models Virtio uses a reserved ID. This is
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* not correct and will be fixed.
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*/
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/* Set to cover 2GB block of DRAM */
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tzc_configure_region(&controller, FILTER_SHIFT(0), 1,
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DRAM_BASE, 0xFFFFFFFF, TZC_REGION_S_RDWR,
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TZC_REGION_ACCESS_RDWR(FVP_NSAID_AP) |
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TZC_REGION_ACCESS_RDWR(FVP_NSAID_DEFAULT) |
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TZC_REGION_ACCESS_RDWR(FVP_NSAID_RES5));
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/* Set to cover the 30GB block */
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tzc_configure_region(&controller, FILTER_SHIFT(0), 2,
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0x880000000, 0xFFFFFFFFF, TZC_REGION_S_RDWR,
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TZC_REGION_ACCESS_RDWR(FVP_NSAID_AP) |
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TZC_REGION_ACCESS_RDWR(FVP_NSAID_DEFAULT) |
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TZC_REGION_ACCESS_RDWR(FVP_NSAID_RES5));
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/* Set to cover 480GB block */
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tzc_configure_region(&controller, FILTER_SHIFT(0), 3,
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0x8800000000, 0xFFFFFFFFFF, TZC_REGION_S_RDWR,
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TZC_REGION_ACCESS_RDWR(FVP_NSAID_AP) |
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TZC_REGION_ACCESS_RDWR(FVP_NSAID_DEFAULT) |
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TZC_REGION_ACCESS_RDWR(FVP_NSAID_RES5));
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/*
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* TODO: Interrupts are not currently supported. The only
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* options we have are for access errors to occur quietly or to
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* cause an exception. We choose to cause an exception.
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*/
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tzc_set_action(&controller, TZC_ACTION_ERR);
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/* Enable filters. */
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tzc_enable_filters(&controller);
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}
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