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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(const struct lfs_config *cfg,
const struct lfs_rambd_config *bdcfg) {
LFS_RAMBD_TRACE("lfs_rambd_createcfg(%p {.context=%p, "
".read=%p, .prog=%p, .erase=%p, .sync=%p, "
".read_size=%"PRIu32", .prog_size=%"PRIu32", "
".block_size=%"PRIu32", .block_count=%"PRIu32"}, "
"%p {.erase_value=%"PRId32", .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,
cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count,
(void*)bdcfg, bdcfg->erase_value, 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(cfg->block_size * cfg->block_count);
if (!bd->buffer) {
LFS_RAMBD_TRACE("lfs_rambd_createcfg -> %d", LFS_ERR_NOMEM);
return LFS_ERR_NOMEM;
}
}
// zero for reproducibility?
if (bd->cfg->erase_value != -1) {
memset(bd->buffer, bd->cfg->erase_value,
cfg->block_size * cfg->block_count);
} else {
memset(bd->buffer, 0, cfg->block_size * cfg->block_count);
}
LFS_RAMBD_TRACE("lfs_rambd_createcfg -> %d", 0);
return 0;
}
int lfs_rambd_create(const struct lfs_config *cfg) {
LFS_RAMBD_TRACE("lfs_rambd_create(%p {.context=%p, "
".read=%p, .prog=%p, .erase=%p, .sync=%p, "
".read_size=%"PRIu32", .prog_size=%"PRIu32", "
".block_size=%"PRIu32", .block_count=%"PRIu32"})",
(void*)cfg, cfg->context,
(void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
(void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count);
static const struct lfs_rambd_config defaults = {.erase_value=-1};
int err = lfs_rambd_createcfg(cfg, &defaults);
LFS_RAMBD_TRACE("lfs_rambd_create -> %d", err);
return err;
}
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(off % cfg->read_size == 0);
LFS_ASSERT(size % cfg->read_size == 0);
LFS_ASSERT(block < cfg->block_count);
// read data
memcpy(buffer, &bd->buffer[block*cfg->block_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(off % cfg->prog_size == 0);
LFS_ASSERT(size % cfg->prog_size == 0);
LFS_ASSERT(block < cfg->block_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*cfg->block_size + off + i] ==
bd->cfg->erase_value);
}
}
// program data
memcpy(&bd->buffer[block*cfg->block_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")", (void*)cfg, block);
lfs_rambd_t *bd = cfg->context;
// check if erase is valid
LFS_ASSERT(block < cfg->block_count);
// erase, only needed for testing
if (bd->cfg->erase_value != -1) {
memset(&bd->buffer[block*cfg->block_size],
bd->cfg->erase_value, cfg->block_size);
}
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 does nothing because we aren't backed by anything real
(void)cfg;
LFS_RAMBD_TRACE("lfs_rambd_sync -> %d", 0);
return 0;
}
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