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https://github.com/ARM-software/arm-trusted-firmware.git
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0af559a833
The arm_setup_page_tables() function used to expect a single set of addresses defining the extents of the whole read-only section, code and read-only data mixed up, which was mapped as executable. This patch changes this behaviour. arm_setup_page_tables() now expects 2 separate sets of addresses: - the extents of the code section; - the extents of the read-only data section. The code is mapped as executable, whereas the data is mapped as execute-never. New #defines have been introduced to identify the extents of the code and the read-only data section. Given that all BL images except BL1 share the same memory layout and linker script structure, these #defines are common across these images. The slight memory layout differences in BL1 have been handled by providing values specific to BL1. Note that this patch also affects the Xilinx platform port, which uses the arm_setup_page_tables() function. It has been updated accordingly, such that the memory mappings on this platform are unchanged. This is achieved by passing null values as the extents of the read-only data section so that it is ignored. As a result, the whole read-only section is still mapped as executable. Fixes ARM-software/tf-issues#85 Change-Id: I1f95865c53ce6e253a01286ff56e0aa1161abac5
113 lines
4.1 KiB
C
113 lines
4.1 KiB
C
/*
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* Copyright (c) 2015-2016, 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 <arch_helpers.h>
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#include <arm_def.h>
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#include <bl_common.h>
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#include <console.h>
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#include <platform_def.h>
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#include <plat_arm.h>
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#include <string.h>
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#if USE_COHERENT_MEM
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/*
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* The next 2 constants identify the extents of the coherent memory region.
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* These addresses are used by the MMU setup code and therefore they must be
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* page-aligned. It is the responsibility of the linker script to ensure that
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* __COHERENT_RAM_START__ and __COHERENT_RAM_END__ linker symbols refer to
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* page-aligned addresses.
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*/
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#define BL2U_COHERENT_RAM_BASE (unsigned long)(&__COHERENT_RAM_START__)
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#define BL2U_COHERENT_RAM_LIMIT (unsigned long)(&__COHERENT_RAM_END__)
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#endif
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/* Weak definitions may be overridden in specific ARM standard platform */
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#pragma weak bl2u_platform_setup
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#pragma weak bl2u_early_platform_setup
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#pragma weak bl2u_plat_arch_setup
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/*
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* Perform ARM standard platform setup for BL2U
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*/
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void arm_bl2u_platform_setup(void)
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{
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/* Initialize the secure environment */
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plat_arm_security_setup();
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}
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void bl2u_platform_setup(void)
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{
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arm_bl2u_platform_setup();
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}
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void arm_bl2u_early_platform_setup(meminfo_t *mem_layout, void *plat_info)
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{
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/* Initialize the console to provide early debug support */
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console_init(PLAT_ARM_BOOT_UART_BASE, PLAT_ARM_BOOT_UART_CLK_IN_HZ,
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ARM_CONSOLE_BAUDRATE);
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}
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/*******************************************************************************
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* BL1 can pass platform dependent information to BL2U in x1.
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* In case of ARM CSS platforms x1 contains SCP_BL2U image info.
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* In case of ARM FVP platforms x1 is not used.
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* In both cases, x0 contains the extents of the memory available to BL2U
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******************************************************************************/
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void bl2u_early_platform_setup(meminfo_t *mem_layout, void *plat_info)
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{
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arm_bl2u_early_platform_setup(mem_layout, plat_info);
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}
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/*******************************************************************************
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* Perform the very early platform specific architectural setup here. At the
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* moment this is only initializes the mmu in a quick and dirty way.
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* The memory that is used by BL2U is only mapped.
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******************************************************************************/
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void arm_bl2u_plat_arch_setup(void)
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{
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arm_setup_page_tables(BL2U_BASE,
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BL31_LIMIT,
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BL_CODE_BASE,
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BL_CODE_LIMIT,
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BL_RO_DATA_BASE,
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BL_RO_DATA_LIMIT
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#if USE_COHERENT_MEM
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,
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BL2U_COHERENT_RAM_BASE,
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BL2U_COHERENT_RAM_LIMIT
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#endif
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);
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enable_mmu_el1(0);
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}
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void bl2u_plat_arch_setup(void)
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{
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arm_bl2u_plat_arch_setup();
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}
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