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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _COMMON_MRC_CACHE_H_
#define _COMMON_MRC_CACHE_H_
#include <stddef.h>
#include <stdint.h>
#include <commonlib/region.h>
enum {
MRC_TRAINING_DATA,
MRC_VARIABLE_DATA,
};
/*
* It's up to the caller to decide when to retrieve and stash data. There is
* differentiation on recovery mode CONFIG(HAS_RECOVERY_MRC_CACHE), but that's
* only for locating where to retrieve and save the data. If a platform doesn't
* want to update the data then it shouldn't stash the data for saving.
* Similarly, if the platform doesn't need the data for booting because of a
* policy don't request the data.
*/
/* Get and stash data for saving provided the type passed in. */
/**
* mrc_cache_load_current
*
* Fill in the buffer with the latest slot data. This will be a
* common entry point for ARM platforms. Returns < 0 on error, size
* of the returned data on success.
*/
ssize_t mrc_cache_load_current(int type, uint32_t version, void *buffer,
size_t buffer_size);
/**
* mrc_cache_mmap_leak
*
* Return a pointer to a buffer with the latest slot data. An mmap
* will be executed (without a matching unmap). This will be a common
* entry point for platforms where mmap is considered a noop, like x86
*/
void *mrc_cache_current_mmap_leak(int type, uint32_t version,
size_t *data_size);
/**
* Returns < 0 on error, 0 on success.
*/
int mrc_cache_stash_data(int type, uint32_t version, const void *data,
size_t size);
#endif /* _COMMON_MRC_CACHE_H_ */
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