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/*
* Block device emulated in RAM
*
* Copyright (c) 2022, The littlefs authors.
* Copyright (c) 2017, Arm Limited. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "bd/lfs_rambd.h"
int lfs_rambd_create(const struct lfs_config *cfg,
const struct lfs_rambd_config *bdcfg) {
LFS_RAMBD_TRACE("lfs_rambd_create(%p {.context=%p, "
".read=%p, .prog=%p, .erase=%p, .sync=%p}, "
"%p {.read_size=%"PRIu32", .prog_size=%"PRIu32", "
".erase_size=%"PRIu32", .erase_count=%"PRIu32", "
".buffer=%p})",
(void*)cfg, cfg->context,
(void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
(void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
(void*)bdcfg,
bdcfg->read_size, bdcfg->prog_size, bdcfg->erase_size,
bdcfg->erase_count, bdcfg->buffer);
lfs_rambd_t *bd = cfg->context;
bd->cfg = bdcfg;
// 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_create -> %d", LFS_ERR_NOMEM);
return LFS_ERR_NOMEM;
}
}
// zero for reproducibility
memset(bd->buffer, 0, bd->cfg->erase_size * bd->cfg->erase_count);
LFS_RAMBD_TRACE("lfs_rambd_create -> %d", 0);
return 0;
}
int lfs_rambd_destroy(const struct lfs_config *cfg) {
LFS_RAMBD_TRACE("lfs_rambd_destroy(%p)", (void*)cfg);
// clean up memory
lfs_rambd_t *bd = cfg->context;
if (!bd->cfg->buffer) {
lfs_free(bd->buffer);
}
LFS_RAMBD_TRACE("lfs_rambd_destroy -> %d", 0);
return 0;
}
int lfs_rambd_read(const struct lfs_config *cfg, 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*)cfg, block, off, buffer, size);
lfs_rambd_t *bd = cfg->context;
// check if read is valid
LFS_ASSERT(block < bd->cfg->erase_count);
LFS_ASSERT(off % bd->cfg->read_size == 0);
LFS_ASSERT(size % bd->cfg->read_size == 0);
LFS_ASSERT(off+size <= bd->cfg->erase_size);
// 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(const struct lfs_config *cfg, 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*)cfg, block, off, buffer, size);
lfs_rambd_t *bd = cfg->context;
// check if write is valid
LFS_ASSERT(block < bd->cfg->erase_count);
LFS_ASSERT(off % bd->cfg->prog_size == 0);
LFS_ASSERT(size % bd->cfg->prog_size == 0);
LFS_ASSERT(off+size <= bd->cfg->erase_size);
// 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(const struct lfs_config *cfg, lfs_block_t block) {
LFS_RAMBD_TRACE("lfs_rambd_erase(%p, 0x%"PRIx32" (%"PRIu32"))",
(void*)cfg, block, ((lfs_rambd_t*)cfg->context)->cfg->erase_size);
lfs_rambd_t *bd = cfg->context;
// check if erase is valid
LFS_ASSERT(block < bd->cfg->erase_count);
// erase is a noop
(void)block;
LFS_RAMBD_TRACE("lfs_rambd_erase -> %d", 0);
return 0;
}
int lfs_rambd_sync(const struct lfs_config *cfg) {
LFS_RAMBD_TRACE("lfs_rambd_sync(%p)", (void*)cfg);
// sync is a noop
(void)cfg;
LFS_RAMBD_TRACE("lfs_rambd_sync -> %d", 0);
return 0;
}
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