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On K3 systems U-Boot runs on both an R5 and a large ARM cores (usually A53 or A72). The large ARMs are coherent with the DMA controllers and the SYSFW that perform authentication. And previously the R5 core did not enable caches. Now that R5 does enable caching we need to be sure to clean out any of the image that may still only be in cache before we read it using external DMA for authentication. Although not expected to happen, it may be possible that the data was read back into cache after the flush but before the external operation, in this case we must invalidate our stale local cached version. Signed-off-by: Andrew F. Davis <afd@ti.com> Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* K3: Security functions
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*
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* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
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* Andrew F. Davis <afd@ti.com>
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <dm.h>
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#include <linux/soc/ti/ti_sci_protocol.h>
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#include <mach/spl.h>
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#include <spl.h>
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#include <asm/arch/sys_proto.h>
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void board_fit_image_post_process(void **p_image, size_t *p_size)
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{
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struct ti_sci_handle *ti_sci = get_ti_sci_handle();
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struct ti_sci_proc_ops *proc_ops = &ti_sci->ops.proc_ops;
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u64 image_addr;
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u32 image_size;
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int ret;
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image_addr = (uintptr_t)*p_image;
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image_size = *p_size;
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debug("Authenticating image at address 0x%016llx\n", image_addr);
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debug("Authenticating image of size %d bytes\n", image_size);
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flush_dcache_range((unsigned long)image_addr,
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ALIGN((unsigned long)image_addr + image_size,
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ARCH_DMA_MINALIGN));
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/* Authenticate image */
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ret = proc_ops->proc_auth_boot_image(ti_sci, &image_addr, &image_size);
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if (ret) {
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printf("Authentication failed!\n");
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hang();
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}
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if (image_size)
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invalidate_dcache_range((unsigned long)image_addr,
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ALIGN((unsigned long)image_addr +
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image_size, ARCH_DMA_MINALIGN));
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/*
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* The image_size returned may be 0 when the authentication process has
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* moved the image. When this happens no further processing on the
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* image is needed or often even possible as it may have also been
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* placed behind a firewall when moved.
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*/
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*p_size = image_size;
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/*
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* Output notification of successful authentication to re-assure the
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* user that the secure code is being processed as expected. However
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* suppress any such log output in case of building for SPL and booting
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* via YMODEM. This is done to avoid disturbing the YMODEM serial
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* protocol transactions.
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*/
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if (!(IS_ENABLED(CONFIG_SPL_BUILD) &&
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IS_ENABLED(CONFIG_SPL_YMODEM_SUPPORT) &&
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spl_boot_device() == BOOT_DEVICE_UART))
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printf("Authentication passed\n");
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}
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