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/*
* Block device emulated in RAM
*
* Copyright (c) 2017, Arm Limited. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "bd/lfs_rambd.h"
int lfs_rambd_createcfg(lfs_rambd_t *bd,
const struct lfs_rambd_cfg *cfg) {
LFS_RAMBD_TRACE("lfs_filebd_createcfg(%p, %p {"
".read_size=%"PRIu32", .prog_size=%"PRIu32", "
".erase_size=%"PRIu32", .erase_count=%"PRIu32", "
".erase_value=%"PRId32", .buffer=%p})",
(void*)bd, (void*)cfg,
cfg->read_size, cfg->prog_size, cfg->erase_size, cfg->erase_count,
cfg->erase_value, cfg->buffer);
bd->cfg = cfg;
// allocate buffer?
if (bd->cfg->buffer) {
bd->buffer = bd->cfg->buffer;
} else {
bd->buffer = lfs_malloc(bd->cfg->erase_size * bd->cfg->erase_count);
if (!bd->buffer) {
LFS_RAMBD_TRACE("lfs_rambd_createcfg -> %d", LFS_ERR_NOMEM);
return LFS_ERR_NOMEM;
}
}
// zero for reproducability?
if (bd->cfg->erase_value != -1) {
memset(bd->buffer, bd->cfg->erase_value,
bd->cfg->erase_size * bd->cfg->erase_count);
}
LFS_RAMBD_TRACE("lfs_rambd_createcfg -> %d", 0);
return 0;
}
int lfs_rambd_destroy(lfs_rambd_t *bd) {
LFS_RAMBD_TRACE("lfs_rambd_destroy(%p)", (void*)bd);
// clean up memory
if (!bd->cfg->buffer) {
lfs_free(bd->buffer);
}
LFS_RAMBD_TRACE("lfs_rambd_destroy -> %d", 0);
return 0;
}
int lfs_rambd_read(lfs_rambd_t *bd, lfs_block_t block,
lfs_off_t off, void *buffer, lfs_size_t size) {
LFS_RAMBD_TRACE("lfs_rambd_read(%p, "
"0x%"PRIx32", %"PRIu32", %p, %"PRIu32")",
(void*)bd, block, off, buffer, size);
// check if read is valid
LFS_ASSERT(off % bd->cfg->read_size == 0);
LFS_ASSERT(size % bd->cfg->read_size == 0);
LFS_ASSERT(block < bd->cfg->erase_count);
// read data
memcpy(buffer, &bd->buffer[block*bd->cfg->erase_size + off], size);
LFS_RAMBD_TRACE("lfs_rambd_read -> %d", 0);
return 0;
}
int lfs_rambd_prog(lfs_rambd_t *bd, lfs_block_t block,
lfs_off_t off, const void *buffer, lfs_size_t size) {
LFS_RAMBD_TRACE("lfs_rambd_prog(%p, "
"0x%"PRIx32", %"PRIu32", %p, %"PRIu32")",
(void*)bd, block, off, buffer, size);
// check if write is valid
LFS_ASSERT(off % bd->cfg->prog_size == 0);
LFS_ASSERT(size % bd->cfg->prog_size == 0);
LFS_ASSERT(block < bd->cfg->erase_count);
// check that data was erased? only needed for testing
if (bd->cfg->erase_value != -1) {
for (lfs_off_t i = 0; i < size; i++) {
LFS_ASSERT(bd->buffer[block*bd->cfg->erase_size + off + i] ==
bd->cfg->erase_value);
}
}
// program data
memcpy(&bd->buffer[block*bd->cfg->erase_size + off], buffer, size);
LFS_RAMBD_TRACE("lfs_rambd_prog -> %d", 0);
return 0;
}
int lfs_rambd_erase(lfs_rambd_t *bd, lfs_block_t block) {
LFS_RAMBD_TRACE("lfs_rambd_erase(%p, 0x%"PRIx32")", (void*)bd, block);
// check if erase is valid
LFS_ASSERT(block < bd->cfg->erase_count);
// erase, only needed for testing
if (bd->cfg->erase_value != -1) {
memset(&bd->buffer[block*bd->cfg->erase_size],
bd->cfg->erase_value, bd->cfg->erase_size);
}
LFS_RAMBD_TRACE("lfs_rambd_erase -> %d", 0);
return 0;
}
int lfs_rambd_sync(lfs_rambd_t *bd) {
LFS_RAMBD_TRACE("lfs_rambd_sync(%p)", (void*)bd);
// sync does nothing because we aren't backed by anything real
(void)bd;
LFS_RAMBD_TRACE("lfs_rambd_sync -> %d", 0);
return 0;
}
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