202 lines
5.9 KiB
C
202 lines
5.9 KiB
C
/*
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* Copyright (c) 2014-2016, 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 <assert.h>
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#include <css_def.h>
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#include <debug.h>
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#include <platform.h>
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#include <stdint.h>
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#include "css_mhu.h"
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#include "css_scp_bootloader.h"
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#include "css_scpi.h"
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/* ID of the MHU slot used for the BOM protocol */
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#define BOM_MHU_SLOT_ID 0
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/* Boot commands sent from AP -> SCP */
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#define BOOT_CMD_INFO 0x00
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#define BOOT_CMD_DATA 0x01
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/* BOM command header */
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typedef struct {
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uint32_t id : 8;
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uint32_t reserved : 24;
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} bom_cmd_t;
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typedef struct {
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uint32_t image_size;
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uint32_t checksum;
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} cmd_info_payload_t;
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/*
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* Unlike the SCPI protocol, the boot protocol uses the same memory region
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* for both AP -> SCP and SCP -> AP transfers; define the address of this...
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*/
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#define BOM_SHARED_MEM PLAT_CSS_SCP_COM_SHARED_MEM_BASE
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#define BOM_CMD_HEADER ((bom_cmd_t *) BOM_SHARED_MEM)
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#define BOM_CMD_PAYLOAD ((void *) (BOM_SHARED_MEM + sizeof(bom_cmd_t)))
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typedef struct {
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/* Offset from the base address of the Trusted RAM */
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uint32_t offset;
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uint32_t block_size;
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} cmd_data_payload_t;
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static void scp_boot_message_start(void)
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{
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mhu_secure_message_start(BOM_MHU_SLOT_ID);
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}
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static void scp_boot_message_send(size_t payload_size)
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{
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/* Ensure that any write to the BOM payload area is seen by SCP before
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* we write to the MHU register. If these 2 writes were reordered by
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* the CPU then SCP would read stale payload data */
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dmbst();
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/* Send command to SCP */
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mhu_secure_message_send(BOM_MHU_SLOT_ID);
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}
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static uint32_t scp_boot_message_wait(size_t size)
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{
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uint32_t mhu_status;
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mhu_status = mhu_secure_message_wait();
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/* Expect an SCP Boot Protocol message, reject any other protocol */
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if (mhu_status != (1 << BOM_MHU_SLOT_ID)) {
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ERROR("MHU: Unexpected protocol (MHU status: 0x%x)\n",
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mhu_status);
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panic();
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}
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/* Ensure that any read to the BOM payload area is done after reading
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* the MHU register. If these 2 reads were reordered then the CPU would
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* read invalid payload data */
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dmbld();
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return *(uint32_t *) BOM_SHARED_MEM;
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}
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static void scp_boot_message_end(void)
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{
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mhu_secure_message_end(BOM_MHU_SLOT_ID);
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}
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int scp_bootloader_transfer(void *image, unsigned int image_size)
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{
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uint32_t response;
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uint32_t checksum;
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cmd_info_payload_t *cmd_info_payload;
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cmd_data_payload_t *cmd_data_payload;
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assert((uintptr_t) image == SCP_BL2_BASE);
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if ((image_size == 0) || (image_size % 4 != 0)) {
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ERROR("Invalid size for the SCP_BL2 image. Must be a multiple of "
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"4 bytes and not zero (current size = 0x%x)\n",
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image_size);
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return -1;
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}
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/* Extract the checksum from the image */
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checksum = *(uint32_t *) image;
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image = (char *) image + sizeof(checksum);
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image_size -= sizeof(checksum);
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mhu_secure_init();
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VERBOSE("Send info about the SCP_BL2 image to be transferred to SCP\n");
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/*
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* Send information about the SCP firmware image about to be transferred
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* to SCP
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*/
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scp_boot_message_start();
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BOM_CMD_HEADER->id = BOOT_CMD_INFO;
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cmd_info_payload = BOM_CMD_PAYLOAD;
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cmd_info_payload->image_size = image_size;
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cmd_info_payload->checksum = checksum;
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scp_boot_message_send(sizeof(*cmd_info_payload));
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#if CSS_DETECT_PRE_1_7_0_SCP
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{
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const uint32_t deprecated_scp_nack_cmd = 0x404;
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uint32_t mhu_status;
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VERBOSE("Detecting SCP version incompatibility\n");
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mhu_status = mhu_secure_message_wait();
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if (mhu_status == deprecated_scp_nack_cmd) {
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ERROR("Detected an incompatible version of the SCP firmware.\n");
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ERROR("Only versions from v1.7.0 onwards are supported.\n");
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ERROR("Please update the SCP firmware.\n");
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return -1;
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}
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VERBOSE("SCP version looks OK\n");
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}
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#endif /* CSS_DETECT_PRE_1_7_0_SCP */
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response = scp_boot_message_wait(sizeof(response));
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scp_boot_message_end();
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if (response != 0) {
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ERROR("SCP BOOT_CMD_INFO returned error %u\n", response);
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return -1;
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}
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VERBOSE("Transferring SCP_BL2 image to SCP\n");
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/* Transfer SCP_BL2 image to SCP */
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scp_boot_message_start();
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BOM_CMD_HEADER->id = BOOT_CMD_DATA;
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cmd_data_payload = BOM_CMD_PAYLOAD;
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cmd_data_payload->offset = (uintptr_t) image - ARM_TRUSTED_SRAM_BASE;
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cmd_data_payload->block_size = image_size;
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scp_boot_message_send(sizeof(*cmd_data_payload));
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response = scp_boot_message_wait(sizeof(response));
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scp_boot_message_end();
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if (response != 0) {
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ERROR("SCP BOOT_CMD_DATA returned error %u\n", response);
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return -1;
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}
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VERBOSE("Waiting for SCP to signal it is ready to go on\n");
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/* Wait for SCP to signal it's ready */
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return scpi_wait_ready();
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}
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