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nodemcu-firmware/app/lua/lflash.c

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/*
** $Id: lflash.c
** See Copyright Notice in lua.h
*/
#define lflash_c
#define LUA_CORE
#include "lua.h"
#include "lobject.h"
#include "lauxlib.h"
#include "lstate.h"
#include "lfunc.h"
#include "lflash.h"
#include "platform.h"
#include "user_interface.h"
#include "vfs.h"
#include "uzlib.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* Flash memory is a fixed memory addressable block that is serially allocated by the
* luac build process and the out image can be downloaded into SPIFSS and loaded into
* flash with a node.flash.load() command. See luac_cross/lflashimg.c for the build
* process.
*/
static char *flashAddr;
static uint32_t flashSize;
static uint32_t flashAddrPhys;
static uint32_t flashSector;
static uint32_t curOffset;
#define ALIGN(s) (((s)+sizeof(size_t)-1) & ((size_t) (- (signed) sizeof(size_t))))
#define ALIGN_BITS(s) (((uint32_t)s) & (sizeof(size_t)-1))
#define ALL_SET (~0)
#define FLASH_PAGE_SIZE INTERNAL_FLASH_SECTOR_SIZE
#define FLASH_PAGES (flashSize/FLASH_PAGE_SIZE)
#define READ_BLOCKSIZE 1024
#define WRITE_BLOCKSIZE 2048
#define DICTIONARY_WINDOW 16384
#define WORDSIZE (sizeof(int))
#define BITS_PER_WORD 32
#define WRITE_BLOCKS ((DICTIONARY_WINDOW/WRITE_BLOCKSIZE)+1)
#define WRITE_BLOCK_WORDS (WRITE_BLOCKSIZE/WORDSIZE)
struct INPUT {
int fd;
int len;
uint8_t block[READ_BLOCKSIZE];
uint8_t *inPtr;
int bytesRead;
int left;
void *inflate_state;
} *in;
typedef struct {
uint8_t byte[WRITE_BLOCKSIZE];
} outBlock;
struct OUTPUT {
lua_State *L;
lu_int32 flash_sig;
int len;
outBlock *block[WRITE_BLOCKS];
outBlock buffer;
int ndx;
uint32_t crc;
void (*fullBlkCB) (void);
int flashLen;
int flagsLen;
int flagsNdx;
uint32_t *flags;
const char *error;
} *out;
#ifdef NODE_DEBUG
void dumpStrt(stringtable *tb, const char *type) {
int i,j;
GCObject *o;
NODE_DBG("\nDumping %s String table\n\n========================\n", type);
NODE_DBG("No of elements: %d\nSize of table: %d\n", tb->nuse, tb->size);
for (i=0; i<tb->size; i++)
for(o = tb->hash[i], j=0; o; (o=o->gch.next), j++ ) {
TString *ts =cast(TString *, o);
NODE_DBG("%5d %5d %08x %08x %5d %s\n",
i, j, (size_t) ts, ts->tsv.hash, ts->tsv.len, getstr(ts));
}
}
LUA_API void dumpStrings(lua_State *L) {
dumpStrt(&G(L)->strt, "RAM");
if (G(L)->ROstrt.hash)
dumpStrt(&G(L)->ROstrt, "ROM");
}
#endif
/* =====================================================================================
* The next 4 functions: flashPosition, flashSetPosition, flashBlock and flashErase
* wrap writing to flash. The last two are platform dependent. Also note that any
* writes are suppressed if the global writeToFlash is false. This is used in
* phase I where the pass is used to size the structures in flash.
*/
static char *flashPosition(void){
return flashAddr + curOffset;
}
static char *flashSetPosition(uint32_t offset){
NODE_DBG("flashSetPosition(%04x)\n", offset);
curOffset = offset;
return flashPosition();
}
static char *flashBlock(const void* b, size_t size) {
void *cur = flashPosition();
NODE_DBG("flashBlock((%04x),%p,%04x)\n", curOffset,b,size);
lua_assert(ALIGN_BITS(b) == 0 && ALIGN_BITS(size) == 0);
platform_flash_write(b, flashAddrPhys+curOffset, size);
curOffset += size;
return cur;
}
static void flashErase(uint32_t start, uint32_t end){
int i;
if (start == -1) start = FLASH_PAGES - 1;
if (end == -1) end = FLASH_PAGES - 1;
NODE_DBG("flashErase(%04x,%04x)\n", flashSector+start, flashSector+end);
for (i = start; i<=end; i++)
platform_flash_erase_sector( flashSector + i );
}
/* =====================================================================================
* luaN_init() is exported via lflash.h.
* The first is the startup hook used in lstate.c and the last two are
* implementations of the node.flash API calls.
*/
/*
* Hook in lstate.c:f_luaopen() to set up ROstrt and ROpvmain if needed
*/
LUAI_FUNC void luaN_init (lua_State *L) {
flashSize = platform_flash_get_partition (NODEMCU_LFS0_PARTITION, &flashAddrPhys);
if (flashSize == 0) {
return; // Nothing to do if the size is zero
}
G(L)->LFSsize = flashSize;
flashAddr = cast(char *, platform_flash_phys2mapped(flashAddrPhys));
flashSector = platform_flash_get_sector_of_address(flashAddrPhys);
FlashHeader *fh = cast(FlashHeader *, flashAddr);
curOffset = 0;
/*
* For the LFS to be valid, its signature has to be correct for this build
* variant, the ROhash and main proto fields must be defined and the main proto
* address be within the LFS address bounds. (This last check is primarily to
* detect the direct imaging of an absolute LFS with the wrong base address.
*/
if (fh->flash_sig == 0 || fh->flash_sig == ~0 ) {
NODE_ERR("No LFS image loaded\n");
return;
}
if ((fh->flash_sig & (~FLASH_SIG_ABSOLUTE)) != FLASH_SIG ) {
NODE_ERR("Flash sig not correct: 0x%08x vs 0x%08x\n",
fh->flash_sig & (~FLASH_SIG_ABSOLUTE), FLASH_SIG);
return;
}
if (fh->pROhash == ALL_SET ||
((fh->mainProto - cast(FlashAddr, fh)) >= fh->flash_size)) {
NODE_ERR("Flash size check failed: 0x%08x vs 0xFFFFFFFF; 0x%08x >= 0x%08x\n",
fh->pROhash, fh->mainProto - cast(FlashAddr, fh), fh->flash_size);
return;
}
G(L)->ROstrt.hash = cast(GCObject **, fh->pROhash);
G(L)->ROstrt.nuse = fh->nROuse ;
G(L)->ROstrt.size = fh->nROsize;
G(L)->ROpvmain = cast(Proto *,fh->mainProto);
}
//extern void software_reset(void);
static int loadLFS (lua_State *L);
static int loadLFSgc (lua_State *L);
static void procFirstPass (void);
/* luaL_lfsreload() is exported via lauxlib.h */
/*
* Library function called by node.flashreload(filename).
*/
LUALIB_API void luaL_lfsreload (lua_State *L) {
const char *fn = lua_tostring(L, 1), *msg = "";
int status;
if (G(L)->LFSsize == 0) {
lua_pushstring(L, "No LFS partition allocated");
return;
}
/*
* Do a protected call of loadLFS.
*
* - This will normally rewrite the LFS and reboot, with no return.
* - If an error occurs then it is sent to the UART.
* - If this occured in the 1st pass, the previous LFS is unchanged so it is
* safe to return to the calling Lua.
* - If in the 1st pass, then the ESP is rebooted.
*/
status = lua_cpcall(L, &loadLFS, cast(void *,fn));
if (!out || out->fullBlkCB == procFirstPass) {
/*
* Never entered the 2nd pass, so it is safe to return the error. Note
* that I've gone to some trouble to ensure that all dynamically allocated
* working areas have been freed, so that we have no memory leaks.
*/
if (status == LUA_ERRMEM)
msg = "Memory allocation error";
else if (out && out->error)
msg = out->error;
else
msg = "Unknown Error";
/* We can clean up and return error */
lua_cpcall(L, &loadLFSgc, NULL);
lua_settop(L, 0);
lua_pushstring(L, msg);
return;
}
if (status == 0) {
/* Successful LFS rewrite */
msg = "LFS region updated. Restarting.";
} else {
/* We have errored during the second pass so clear the LFS and reboot */
if (status == LUA_ERRMEM)
msg = "Memory allocation error";
else if (out->error)
msg = out->error;
else
msg = "Unknown Error";
flashErase(0,-1);
}
NODE_ERR(msg);
while (1) {} // Force WDT as the ROM software_reset() doesn't seem to work
}
LUA_API void lua_getlfsconfig (lua_State *L, int *config) {
if (!config)
return;
config[0] = (int) flashAddr; /* LFS region mapped address */
config[1] = flashAddrPhys; /* LFS region base flash address */
config[2] = G(L)->LFSsize; /* LFS region actual size */
config[3] = (G(L)->ROstrt.hash) ? cast(FlashHeader *, flashAddr)->flash_size : 0;
/* LFS region used */
config[4] = 0; /* Not used in Lua 5.1 */
}
/* =====================================================================================
* The following routines use my uzlib which was based on pfalcon's inflate and
* deflate routines. The standard NodeMCU make also makes two host tools uz_zip
* and uz_unzip which also use these and luac.cross uses the deflate. As discussed
* below, The main action routine loadLFS() calls uzlib_inflate() to do the actual
* stream inflation but uses three supplied CBs to abstract input and output
* stream handling.
*
* ESP8266 RAM limitations and heap fragmentation are a key implementation
* constraint and hence these routines use a number of ~2K buffers (11) as
* working storage.
*
* The inflate is done twice, in order to limit storage use and avoid forward /
* backward reference issues. However this has a major advantage that the LFS
* is scanned with the headers, CRC, etc. validated BEFORE the write to flash
* is started, so the only real chance of failure during the second pass
* write is if a power fail occurs during the pass.
*/
static void flash_error(const char *err) {
if (out)
out->error = err;
if (in && in->inflate_state)
uz_free(in->inflate_state);
lua_pushnil(out->L); /* can't use it on a cpcall anyway */
lua_error(out->L);
}
/*
* uzlib_inflate does a stream inflate on an RFC 1951 encoded data stream.
* It uses three application-specific CBs passed in the call to do the work:
*
* - get_byte() CB to return next byte in input stream
* - put_byte() CB to output byte to output buffer
* - recall_byte() CB to output byte to retrieve a historic byte from
* the output buffer.
*
* Note that put_byte() also triggers secondary CBs to do further processing.
*/
static uint8_t get_byte (void) {
if (--in->left < 0) {
/* Read next input block */
int remaining = in->len - in->bytesRead;
int wanted = remaining >= READ_BLOCKSIZE ? READ_BLOCKSIZE : remaining;
if (vfs_read(in->fd, in->block, wanted) != wanted)
flash_error("read error on LFS image file");
system_soft_wdt_feed();
in->bytesRead += wanted;
in->inPtr = in->block;
in->left = wanted-1;
}
return *in->inPtr++;
}
static void put_byte (uint8_t value) {
int offset = out->ndx % WRITE_BLOCKSIZE; /* counts from 0 */
out->block[0]->byte[offset++] = value;
out->ndx++;
if (offset == WRITE_BLOCKSIZE || out->ndx == out->len) {
if (out->fullBlkCB)
out->fullBlkCB();
/* circular shift the block pointers (redundant on last block, but so what) */
outBlock *nextBlock = out->block[WRITE_BLOCKS - 1];
memmove(out->block+1, out->block, (WRITE_BLOCKS-1)*sizeof(void*));
out->block[0] = nextBlock ;
}
}
static uint8_t recall_byte (unsigned offset) {
if(offset > DICTIONARY_WINDOW || offset >= out->ndx)
flash_error("invalid dictionary offset on inflate");
/* ndx starts at 1. Need relative to 0 */
unsigned n = out->ndx - offset;
unsigned pos = n % WRITE_BLOCKSIZE;
unsigned blockNo = out->ndx / WRITE_BLOCKSIZE - n / WRITE_BLOCKSIZE;
return out->block[blockNo]->byte[pos];
}
/*
* On the first pass the break index is set to call this process at the end
* of each completed output buffer.
* - On the first call, the Flash Header is checked.
* - On each call the CRC is rolled up for that buffer.
* - Once the flags array is in-buffer this is also captured.
* This logic is slightly complicated by the last buffer is typically short.
*/
void procFirstPass (void) {
int len = (out->ndx % WRITE_BLOCKSIZE) ?
out->ndx % WRITE_BLOCKSIZE : WRITE_BLOCKSIZE;
if (out->ndx <= WRITE_BLOCKSIZE) {
/* Process the flash header and cache the FlashHeader fields we need */
FlashHeader *fh = cast(FlashHeader *, out->block[0]);
out->flashLen = fh->flash_size; /* in bytes */
out->flagsLen = (out->len-fh->flash_size)/WORDSIZE; /* in words */
out->flash_sig = fh->flash_sig;
if ((fh->flash_sig & FLASH_FORMAT_MASK) != FLASH_FORMAT_VERSION)
flash_error("Incorrect LFS header version");
if ((fh->flash_sig & FLASH_SIG_B2_MASK) != FLASH_SIG_B2)
flash_error("Incorrect LFS build type");
if ((fh->flash_sig & ~FLASH_SIG_ABSOLUTE) != FLASH_SIG)
flash_error("incorrect LFS header signature");
if (fh->flash_size > flashSize)
flash_error("LFS Image too big for configured LFS region");
if ((fh->flash_size & 0x3) ||
fh->flash_size > flashSize ||
out->flagsLen != 1 + (out->flashLen/WORDSIZE - 1) / BITS_PER_WORD)
flash_error("LFS length mismatch");
out->flags = luaM_newvector(out->L, out->flagsLen, unsigned);
}
/* update running CRC */
out->crc = uzlib_crc32(out->block[0], len, out->crc);
/* copy out any flag vector */
if (out->ndx > out->flashLen) {
int start = out->flashLen - (out->ndx - len);
if (start < 0) start = 0;
memcpy(out->flags + out->flagsNdx, out->block[0]->byte + start, len - start);
out->flagsNdx += (len -start) / WORDSIZE; /* flashLen and len are word aligned */
}
}
void procSecondPass (void) {
/*
* The length rules are different for the second pass since this only processes
* upto the flashLen and not the full image. This also works in word units.
* (We've already validated these are word multiples.)
*/
int i, len = (out->ndx > out->flashLen) ?
(out->flashLen % WRITE_BLOCKSIZE) / WORDSIZE :
WRITE_BLOCKSIZE / WORDSIZE;
uint32_t *buf = (uint32_t *) out->buffer.byte;
uint32_t flags = 0;
/*
* Relocate all the addresses tagged in out->flags. This can't be done in
* place because the out->blocks are still in use as dictionary content so
* first copy the block to a working buffer and do the relocation in this.
*/
memcpy(out->buffer.byte, out->block[0]->byte, WRITE_BLOCKSIZE);
for (i=0; i<len; i++,flags>>=1 ) {
if ((i&31)==0)
flags = out->flags[out->flagsNdx++];
if (flags&1)
buf[i] = WORDSIZE*buf[i] + cast(uint32_t, flashAddr);
}
/*
* On first block, set the flash_sig has the in progress bit set and this
* is not cleared until end.
*/
if (out->ndx <= WRITE_BLOCKSIZE)
buf[0] = out->flash_sig | FLASH_SIG_IN_PROGRESS;
flashBlock(buf, len*WORDSIZE);
if (out->ndx >= out->flashLen) {
/* we're done so disable CB and rewrite flash sig to complete flash */
flashSetPosition(0);
flashBlock(&out->flash_sig, WORDSIZE);
out->fullBlkCB = NULL;
}
}
/*
* loadLFS)() is protected called from luaL_lfsreload() so that it can recover
* from out of memory and other thrown errors. loadLFSgc() GCs any resources.
*/
static int loadLFS (lua_State *L) {
const char *fn = cast(const char *, lua_touserdata(L, 1));
int i, res;
uint32_t crc;
/* Allocate and zero in and out structures */
in = NULL; out = NULL;
in = luaM_new(L, struct INPUT);
memset(in, 0, sizeof(*in));
out = luaM_new(L, struct OUTPUT);
memset(out, 0, sizeof(*out));
out->L = L;
out->fullBlkCB = procFirstPass;
out->crc = ~0;
/* Open LFS image/ file, read unpacked length from last 4 byte and rewind */
if (!(in->fd = vfs_open(fn, "r")))
flash_error("LFS image file not found");
in->len = vfs_size(in->fd);
if (in->len <= 200 || /* size of an empty luac output */
vfs_lseek(in->fd, in->len-4, VFS_SEEK_SET) != in->len-4 ||
vfs_read(in->fd, &out->len, sizeof(unsigned)) != sizeof(unsigned))
flash_error("read error on LFS image file");
vfs_lseek(in->fd, 0, VFS_SEEK_SET);
/* Allocate the out buffers */
for(i = 0; i < WRITE_BLOCKS; i++)
out->block[i] = luaM_new(L, outBlock);
/* first inflate pass */
if (uzlib_inflate (get_byte, put_byte, recall_byte,
in->len, &crc, &in->inflate_state) < 0)
flash_error("read error on LFS image file");
if (crc != ~out->crc)
flash_error("checksum error on LFS image file");
out->fullBlkCB = procSecondPass;
out->flagsNdx = 0;
out->ndx = 0;
in->bytesRead = in->left = 0;
/*
* Once we have completed the 1st pass then the LFS image has passed the
* basic signature, crc and length checks, so now we can reset the counts
* to do the actual write to flash on the second pass.
*/
vfs_lseek(in->fd, 0, VFS_SEEK_SET);
flashErase(0,(out->flashLen - 1)/FLASH_PAGE_SIZE);
flashSetPosition(0);
res = uzlib_inflate(get_byte, put_byte, recall_byte,
in->len, &crc, &in->inflate_state);
if (res < 0) { // UZLIB_OK == 0, UZLIB_DONE == 1
const char *err[] = {"Data_error during decompression",
"Chksum_error during decompression",
"Dictionary error during decompression",
"Memory_error during decompression"};
flash_error(err[UZLIB_DATA_ERROR - res]);
}
return 0;
}
static int loadLFSgc (lua_State *L) {
int i;
if (out) {
for (i = 0; i < WRITE_BLOCKS; i++)
if (out->block[i])
luaM_free(L, out->block[i]);
if (out->flags)
luaM_freearray(L, out->flags, out->flagsLen, uint32_t);
luaM_free(L, out);
}
if (in) {
if (in->fd)
vfs_close(in->fd);
luaM_free(L, in);
}
return 0;
}
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