f7d6eb2fef
This patch adds a new way of implementing flash access for libpayload. Until now all reads had to be performed using cbfs_media, which is obsolete. From now on all reads should be performed using boot_device_read(). This patch also provides a default implementation of boot_device_read() for x86 architecture. Change-Id: I1babd2a8414ed9de3ca49903fcb4f036997b5ff3 Signed-off-by: Jakub Czapiga <jacz@semihalf.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/59492 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
17 lines
537 B
C
17 lines
537 B
C
/* SPDX-License-Identifier: BSD-3-Clause */
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#include <boot_device.h>
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#include <commonlib/bsd/cb_err.h>
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#include <stddef.h>
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#include <string.h>
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#include <sysinfo.h>
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__attribute__((weak)) ssize_t boot_device_read(void *buf, size_t offset, size_t size)
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{
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/* Memory-mapping usually only works for the top 16MB. */
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if (!lib_sysinfo.boot_media_size || lib_sysinfo.boot_media_size - offset > 16 * MiB)
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return CB_ERR_ARG;
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void *ptr = (void *)(uintptr_t)(0 - lib_sysinfo.boot_media_size + offset);
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memcpy(buf, ptr, size);
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return size;
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}
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