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https://github.com/ARM-software/arm-trusted-firmware.git
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4c117f6c49
This patch adds support for booting EL3 payloads on CSS platforms, for example Juno. In this scenario, the Trusted Firmware follows its normal boot flow up to the point where it would normally pass control to the BL31 image. At this point, it jumps to the EL3 payload entry point address instead. Before handing over to the EL3 payload, the data SCP writes for AP at the beginning of the Trusted SRAM is restored, i.e. we zero the first 128 bytes and restore the SCP Boot configuration. The latter is saved before transferring the BL30 image to SCP and is restored just after the transfer (in BL2). The goal is to make it appear that the EL3 payload is the first piece of software to run on the target. The BL31 entrypoint info structure is updated to make the primary CPU jump to the EL3 payload instead of the BL31 image. The mailbox is populated with the EL3 payload entrypoint address, which releases the secondary CPUs out of their holding pen (if the SCP has powered them on). The arm_program_trusted_mailbox() function has been exported for this purpose. The TZC-400 configuration in BL2 is simplified: it grants secure access only to the whole DRAM. Other security initialization is unchanged. This alternative boot flow is disabled by default. A new build option EL3_PAYLOAD_BASE has been introduced to enable it and provide the EL3 payload's entry point address. The build system has been modified such that BL31 and BL33 are not compiled and/or not put in the FIP in this case, as those images are not used in this boot flow. Change-Id: Id2e26fa57988bbc32323a0effd022ab42f5b5077
96 lines
3.4 KiB
C
96 lines
3.4 KiB
C
/*
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* Copyright (c) 2015, 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 <bl_common.h>
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#include <css_def.h>
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#include <debug.h>
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#include <mmio.h>
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#include <plat_arm.h>
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#include <string.h>
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#include "css_scp_bootloader.h"
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/* Weak definition may be overridden in specific CSS based platform */
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#pragma weak bl2_plat_handle_bl30
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/*******************************************************************************
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* Transfer BL3-0 from Trusted RAM using the SCP Download protocol.
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* Return 0 on success, -1 otherwise.
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******************************************************************************/
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int bl2_plat_handle_bl30(image_info_t *bl30_image_info)
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{
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int ret;
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INFO("BL2: Initiating BL3-0 transfer to SCP\n");
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ret = scp_bootloader_transfer((void *)bl30_image_info->image_base,
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bl30_image_info->image_size);
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if (ret == 0)
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INFO("BL2: BL3-0 transferred to SCP\n");
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else
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ERROR("BL2: BL3-0 transfer failure\n");
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return ret;
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}
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#ifdef EL3_PAYLOAD_BASE
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/*
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* We need to override some of the platform functions when booting an EL3
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* payload.
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*/
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static unsigned int scp_boot_config;
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void bl2_early_platform_setup(meminfo_t *mem_layout)
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{
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arm_bl2_early_platform_setup(mem_layout);
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/* Save SCP Boot config before it gets overwritten by BL30 loading */
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scp_boot_config = mmio_read_32(SCP_BOOT_CFG_ADDR);
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VERBOSE("BL2: Saved SCP Boot config = 0x%x\n", scp_boot_config);
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}
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void bl2_platform_setup(void)
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{
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arm_bl2_platform_setup();
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/*
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* Before releasing the AP cores out of reset, the SCP writes some data
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* at the beginning of the Trusted SRAM. It is is overwritten before
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* reaching this function. We need to restore this data, as if the
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* target had just come out of reset. This implies:
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* - zeroing the first 128 bytes of Trusted SRAM;
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* - restoring the SCP boot configuration.
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*/
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VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n");
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memset((void *) ARM_TRUSTED_SRAM_BASE, 0, 128);
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mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config);
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}
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#endif /* EL3_PAYLOAD_BASE */
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