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ed5672070d
In certain instances a platform may need to make modifications to an image after it has been loaded by BL2. The existing common implementation is a thin wrapper for a more generic arm post image handler. To enable platforms to make changes to images when they're loaded, move this into platform code. Change-Id: I44025391056adb2d8a8eb4ea5984257b02027181 Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
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* Copyright (c) 2015-2023, Arm Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <string.h>
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#include <common/bl_common.h>
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#include <common/debug.h>
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#include <drivers/arm/css/css_scp.h>
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#include <lib/mmio.h>
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#include <lib/utils.h>
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#include <plat/arm/common/plat_arm.h>
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#include <platform_def.h>
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/* Weak definition may be overridden in specific CSS based platform */
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#pragma weak plat_arm_bl2_handle_scp_bl2
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/*******************************************************************************
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* Transfer SCP_BL2 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 plat_arm_bl2_handle_scp_bl2(image_info_t *scp_bl2_image_info)
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{
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int ret;
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INFO("BL2: Initiating SCP_BL2 transfer to SCP\n");
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ret = css_scp_boot_image_xfer((void *)scp_bl2_image_info->image_base,
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scp_bl2_image_info->image_size);
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if (ret == 0)
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ret = css_scp_boot_ready();
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if (ret == 0)
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INFO("BL2: SCP_BL2 transferred to SCP\n");
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else
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ERROR("BL2: SCP_BL2 transfer failure\n");
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return ret;
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}
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#if !CSS_USE_SCMI_SDS_DRIVER
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# if defined(EL3_PAYLOAD_BASE) || JUNO_AARCH32_EL3_RUNTIME
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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 or SP_MIN on Juno AArch32. This needs to be done only for
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* SCPI/BOM SCP systems as in case of SDS, the structures remain in memory and
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* don't need to be overwritten.
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*/
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static unsigned int scp_boot_config;
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void bl2_early_platform_setup2(u_register_t arg0, u_register_t arg1,
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u_register_t arg2, u_register_t arg3)
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{
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arm_bl2_early_platform_setup((uintptr_t)arg0, (meminfo_t *)arg1);
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/* Save SCP Boot config before it gets overwritten by SCP_BL2 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 using zeromem instead
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* of zero_normalmem since this is device memory.
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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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zeromem((void *) ARM_SHARED_RAM_BASE, 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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#endif /* CSS_USE_SCMI_SDS_DRIVER */
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int bl2_plat_handle_post_image_load(unsigned int image_id)
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{
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return arm_bl2_plat_handle_post_image_load(image_id);
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}
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