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