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kiwibd: Added kiwibd, a lighter-weight variant of emubd

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Useful for emulating much larger disks in a file (or in RAM). kiwibd
doesn't have all the features of emubd, but this allows it to prioritize
disk size and speed for benchmarking.

kiwibd still keeps some features useful for benchmarking/emulation:

- Optional erase value emulation, including nor-masking

- Read/prog/erase trackers for measuring bd operations

- Read/prog/erase sleeps for slowing down the simulation to a human
  viewable speed
This commit is contained in:
Christopher Haster
2025-08-13 12:10:05 -05:00
parent 6ba3204816
commit 232f039ccc
6 changed files with 731 additions and 19 deletions
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bd/lfs3_rambd.c
+7 -7
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@@ -24,17 +24,17 @@ int lfs3_rambd_createcfg(const struct lfs3_cfg *cfg,
// allocate buffer?
if (bd->cfg->buffer) {
bd->buffer = bd->cfg->buffer;
bd->mem = bd->cfg->buffer;
} else {
bd->buffer = lfs3_malloc(cfg->block_size * cfg->block_count);
if (!bd->buffer) {
bd->mem = lfs3_malloc(cfg->block_size * cfg->block_count);
if (!bd->mem) {
LFS3_RAMBD_TRACE("lfs3_rambd_createcfg -> %d", LFS3_ERR_NOMEM);
return LFS3_ERR_NOMEM;
}
}
// zero for reproducibility
memset(bd->buffer, 0, cfg->block_size * cfg->block_count);
memset(bd->mem, 0, cfg->block_size * cfg->block_count);
LFS3_RAMBD_TRACE("lfs3_rambd_createcfg -> %d", 0);
return 0;
@@ -60,7 +60,7 @@ int lfs3_rambd_destroy(const struct lfs3_cfg *cfg) {
// clean up memory
lfs3_rambd_t *bd = cfg->context;
if (!bd->cfg->buffer) {
lfs3_free(bd->buffer);
lfs3_free(bd->mem);
}
LFS3_RAMBD_TRACE("lfs3_rambd_destroy -> %d", 0);
return 0;
@@ -80,7 +80,7 @@ int lfs3_rambd_read(const struct lfs3_cfg *cfg, lfs3_block_t block,
LFS3_ASSERT(off+size <= cfg->block_size);
// read data
memcpy(buffer, &bd->buffer[block*cfg->block_size + off], size);
memcpy(buffer, &bd->mem[block*cfg->block_size + off], size);
LFS3_RAMBD_TRACE("lfs3_rambd_read -> %d", 0);
return 0;
@@ -100,7 +100,7 @@ int lfs3_rambd_prog(const struct lfs3_cfg *cfg, lfs3_block_t block,
LFS3_ASSERT(off+size <= cfg->block_size);
// program data
memcpy(&bd->buffer[block*cfg->block_size + off], buffer, size);
memcpy(&bd->mem[block*cfg->block_size + off], buffer, size);
LFS3_RAMBD_TRACE("lfs3_rambd_prog -> %d", 0);
return 0;