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688d62bfc8
Allow loading a FIT image via semihosting in SPL. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com>
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*/
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#include <common.h>
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#include <image.h>
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#include <log.h>
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#include <semihosting.h>
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#include <spl.h>
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static int smh_read_full(long fd, void *memp, size_t len)
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{
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long read;
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read = smh_read(fd, memp, len);
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if (read < 0)
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return read;
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if (read != len)
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return -EIO;
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return 0;
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}
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static ulong smh_fit_read(struct spl_load_info *load, ulong file_offset,
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ulong size, void *buf)
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{
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long fd;
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ulong ret;
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fd = smh_open(load->filename, MODE_READ | MODE_BINARY);
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if (fd < 0) {
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log_debug("could not open %s: %ld\n", load->filename, fd);
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return 0;
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}
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ret = smh_read(fd, buf, size);
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smh_close(fd);
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return ret;
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}
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static int spl_smh_load_image(struct spl_image_info *spl_image,
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struct spl_boot_device *bootdev)
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{
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const char *filename = CONFIG_SPL_FS_LOAD_PAYLOAD_NAME;
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int ret;
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long fd, len;
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struct legacy_img_hdr *header =
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spl_get_load_buffer(-sizeof(*header), sizeof(*header));
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fd = smh_open(filename, MODE_READ | MODE_BINARY);
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if (fd < 0) {
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log_debug("could not open %s: %ld\n", filename, fd);
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return fd;
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}
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ret = smh_flen(fd);
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if (ret < 0) {
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log_debug("could not get length of image: %d\n", ret);
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goto out;
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}
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len = ret;
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ret = smh_read_full(fd, header, sizeof(struct legacy_img_hdr));
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if (ret) {
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log_debug("could not read image header: %d\n", ret);
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goto out;
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}
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if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
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image_get_magic(header) == FDT_MAGIC) {
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struct spl_load_info load;
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debug("Found FIT\n");
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load.read = smh_fit_read;
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load.bl_len = 1;
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load.filename = filename;
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load.priv = NULL;
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smh_close(fd);
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return spl_load_simple_fit(spl_image, &load, 0, header);
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}
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ret = spl_parse_image_header(spl_image, bootdev, header);
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if (ret) {
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log_debug("failed to parse image header: %d\n", ret);
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goto out;
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}
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ret = smh_seek(fd, 0);
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if (ret) {
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log_debug("could not seek to start of image: %d\n", ret);
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goto out;
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}
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ret = smh_read_full(fd, (void *)spl_image->load_addr, len);
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if (ret)
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log_debug("could not read %s: %d\n", filename, ret);
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out:
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smh_close(fd);
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return ret;
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}
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SPL_LOAD_IMAGE_METHOD("SEMIHOSTING", 0, BOOT_DEVICE_SMH, spl_smh_load_image);
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