81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
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/*
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* Copyright (c) 2018, 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 <assert.h>
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#include <stdint.h>
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#include <arch_helpers.h>
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#include <common/bl_common.h>
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#include <common/debug.h>
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#include <common/image_decompress.h>
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static uintptr_t decompressor_buf_base;
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static uint32_t decompressor_buf_size;
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static decompressor_t *decompressor;
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static struct image_info saved_image_info;
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void image_decompress_init(uintptr_t buf_base, uint32_t buf_size,
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decompressor_t *_decompressor)
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{
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decompressor_buf_base = buf_base;
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decompressor_buf_size = buf_size;
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decompressor = _decompressor;
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}
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void image_decompress_prepare(struct image_info *info)
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{
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/*
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* If the image is compressed, it should be loaded into the temporary
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* buffer instead of its final destination. We save image_info, then
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* override ->image_base and ->image_max_size so that load_image() will
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* transfer the compressed data to the temporary buffer.
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*/
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saved_image_info = *info;
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info->image_base = decompressor_buf_base;
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info->image_max_size = decompressor_buf_size;
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}
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int image_decompress(struct image_info *info)
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{
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uintptr_t compressed_image_base, image_base, work_base;
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uint32_t compressed_image_size, work_size;
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int ret;
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/*
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* The size of compressed data has been filled by load_image().
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* Read it out before restoring image_info.
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*/
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compressed_image_size = info->image_size;
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compressed_image_base = info->image_base;
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*info = saved_image_info;
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assert(compressed_image_size <= decompressor_buf_size);
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image_base = info->image_base;
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/*
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* Use the rest of the temporary buffer as workspace of the
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* decompressor since the decompressor may need additional memory.
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*/
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work_base = compressed_image_base + compressed_image_size;
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work_size = decompressor_buf_size - compressed_image_size;
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ret = decompressor(&compressed_image_base, compressed_image_size,
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&image_base, info->image_max_size,
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work_base, work_size);
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if (ret) {
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ERROR("Failed to decompress image (err=%d)\n", ret);
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return ret;
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}
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/* image_base is updated to the final pos when decompressor() exits. */
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info->image_size = image_base - info->image_base;
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flush_dcache_range(info->image_base, info->image_size);
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return 0;
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}
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