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7eae1db027
So far the i.MX BL31 doesn't take any parameters. This means the BL32 image base address and whether or not a BL32 image is used at all has to be hardcoded in BL31. This adds a helper function that allows to take params from BL2 safely. On i.MX BL2 is usually U-Boot SPL which passes random values in arg0, so make sure arg0 is within the internal SRAM range before accessing it as a pointer. Also make sure arg0 is sufficiently aligned and the header type and version is correct. Change-Id: Idab8013a1d6dabf50a83c75f3e6f831de4a537e9 Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
48 lines
1 KiB
C
48 lines
1 KiB
C
/*
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* Copyright (c) 2024, Pengutronix, Inc. 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 <errno.h>
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#include <stdint.h>
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#include <common/bl_common.h>
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#include <common/desc_image_load.h>
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#include <plat_common.h>
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/*
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* This function checks if @arg0 can safely be accessed as a pointer
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* and if it does, it fills in @bl32_info and @bl33_info with data
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* found in @arg0.
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*
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* Returns 0 when @arg0 can be used as entry point info and a negative
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* error code otherwise.
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*/
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int imx_bl31_params_parse(uintptr_t arg0, uintptr_t ocram_base,
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uintptr_t ocram_size,
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entry_point_info_t *bl32_info,
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entry_point_info_t *bl33_info)
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{
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bl_params_t *v2 = (void *)(uintptr_t)arg0;
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if (arg0 & 0x3) {
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return -EINVAL;
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}
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if (arg0 < ocram_base || arg0 >= ocram_base + ocram_size) {
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return -EINVAL;
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}
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if (v2->h.version != PARAM_VERSION_2) {
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return -EINVAL;
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}
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if (v2->h.type != PARAM_BL_PARAMS) {
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return -EINVAL;
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}
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bl31_params_parse_helper(arg0, bl32_info, bl33_info);
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return 0;
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}
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