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 Until now all reads had to be performed using cbfs_media, which is obsolete.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>
23 lines
841 B
C
23 lines
841 B
C
/* SPDX-License-Identifier: BSD-3-Clause */
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#ifndef _BOOT_DEVICE_H
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#define _BOOT_DEVICE_H
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#include <stddef.h>
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/**
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* This is a boot device access function, which is used by libpayload to read data from
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* the flash memory (or other boot device). It has to be implemented by payloads that want
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* to use FMAP or libcbfs.
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*
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* @param buf The output buffer to which the data should be written to.
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* @param offset Absolute offset in bytes of the requested boot device memory area. Not aligned.
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* @param size Size in bytes of the requested boot device memory area. Not aligned.
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*
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* @returns Number of bytes returned to the buffer, or negative value on error. Typically should
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* be equal to the `size`, and not aligned forcefully.
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*/
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ssize_t boot_device_read(void *buf, size_t offset, size_t size);
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#endif /* _BOOT_DEVICE_H */
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