diff options
Diffstat (limited to 'package/unvram/src/nvram.c')
| -rw-r--r-- | package/unvram/src/nvram.c | 531 |
1 files changed, 0 insertions, 531 deletions
diff --git a/package/unvram/src/nvram.c b/package/unvram/src/nvram.c deleted file mode 100644 index 78baa9431d..0000000000 --- a/package/unvram/src/nvram.c +++ /dev/null @@ -1,531 +0,0 @@ -/* - * NVRAM variable manipulation (common) - * - * Copyright 2004, Broadcom Corporation - * Copyright 2009, OpenWrt.org - * All Rights Reserved. - * - * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY - * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM - * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS - * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE. - * - */ - -#include "nvram.h" - -#define TRACE(msg) \ - printf("%s(%i) in %s(): %s\n", \ - __FILE__, __LINE__, __FUNCTION__, msg ? msg : "?") - -size_t nvram_erase_size = 0; - - -/* - * -- Helper functions -- - */ - -/* String hash */ -static uint32_t hash(const char *s) -{ - uint32_t hash = 0; - - while (*s) - hash = 31 * hash + *s++; - - return hash; -} - -/* Free all tuples. */ -static void _nvram_free(nvram_handle_t *h) -{ - uint32_t i; - nvram_tuple_t *t, *next; - - /* Free hash table */ - for (i = 0; i < NVRAM_ARRAYSIZE(h->nvram_hash); i++) { - for (t = h->nvram_hash[i]; t; t = next) { - next = t->next; - free(t); - } - h->nvram_hash[i] = NULL; - } - - /* Free dead table */ - for (t = h->nvram_dead; t; t = next) { - next = t->next; - free(t); - } - - h->nvram_dead = NULL; -} - -/* (Re)allocate NVRAM tuples. */ -static nvram_tuple_t * _nvram_realloc( nvram_handle_t *h, nvram_tuple_t *t, - const char *name, const char *value ) -{ - if ((strlen(value) + 1) > NVRAM_SPACE) - return NULL; - - if (!t) { - if (!(t = malloc(sizeof(nvram_tuple_t) + strlen(name) + 1))) - return NULL; - - /* Copy name */ - t->name = (char *) &t[1]; - strcpy(t->name, name); - - t->value = NULL; - } - - /* Copy value */ - if (!t->value || strcmp(t->value, value)) - { - if(!(t->value = (char *) realloc(t->value, strlen(value)+1))) - return NULL; - - strcpy(t->value, value); - t->value[strlen(value)] = '\0'; - } - - return t; -} - -/* (Re)initialize the hash table. */ -static int _nvram_rehash(nvram_handle_t *h) -{ - nvram_header_t *header = nvram_header(h); - char buf[] = "0xXXXXXXXX", *name, *value, *eq; - - /* (Re)initialize hash table */ - _nvram_free(h); - - /* Parse and set "name=value\0 ... \0\0" */ - name = (char *) &header[1]; - - for (; *name; name = value + strlen(value) + 1) { - if (!(eq = strchr(name, '='))) - break; - *eq = '\0'; - value = eq + 1; - nvram_set(h, name, value); - *eq = '='; - } - - /* Set special SDRAM parameters */ - if (!nvram_get(h, "sdram_init")) { - sprintf(buf, "0x%04X", (uint16_t)(header->crc_ver_init >> 16)); - nvram_set(h, "sdram_init", buf); - } - if (!nvram_get(h, "sdram_config")) { - sprintf(buf, "0x%04X", (uint16_t)(header->config_refresh & 0xffff)); - nvram_set(h, "sdram_config", buf); - } - if (!nvram_get(h, "sdram_refresh")) { - sprintf(buf, "0x%04X", - (uint16_t)((header->config_refresh >> 16) & 0xffff)); - nvram_set(h, "sdram_refresh", buf); - } - if (!nvram_get(h, "sdram_ncdl")) { - sprintf(buf, "0x%08X", header->config_ncdl); - nvram_set(h, "sdram_ncdl", buf); - } - - return 0; -} - - -/* - * -- Public functions -- - */ - -/* Get nvram header. */ -nvram_header_t * nvram_header(nvram_handle_t *h) -{ - return (nvram_header_t *) &h->mmap[NVRAM_START(nvram_erase_size)]; -} - -/* Get the value of an NVRAM variable. */ -char * nvram_get(nvram_handle_t *h, const char *name) -{ - uint32_t i; - nvram_tuple_t *t; - char *value; - - if (!name) - return NULL; - - /* Hash the name */ - i = hash(name) % NVRAM_ARRAYSIZE(h->nvram_hash); - - /* Find the associated tuple in the hash table */ - for (t = h->nvram_hash[i]; t && strcmp(t->name, name); t = t->next); - - value = t ? t->value : NULL; - - return value; -} - -/* Set the value of an NVRAM variable. */ -int nvram_set(nvram_handle_t *h, const char *name, const char *value) -{ - uint32_t i; - nvram_tuple_t *t, *u, **prev; - - /* Hash the name */ - i = hash(name) % NVRAM_ARRAYSIZE(h->nvram_hash); - - /* Find the associated tuple in the hash table */ - for (prev = &h->nvram_hash[i], t = *prev; - t && strcmp(t->name, name); prev = &t->next, t = *prev); - - /* (Re)allocate tuple */ - if (!(u = _nvram_realloc(h, t, name, value))) - return -12; /* -ENOMEM */ - - /* Value reallocated */ - if (t && t == u) - return 0; - - /* Move old tuple to the dead table */ - if (t) { - *prev = t->next; - t->next = h->nvram_dead; - h->nvram_dead = t; - } - - /* Add new tuple to the hash table */ - u->next = h->nvram_hash[i]; - h->nvram_hash[i] = u; - - return 0; -} - -/* Unset the value of an NVRAM variable. */ -int nvram_unset(nvram_handle_t *h, const char *name) -{ - uint32_t i; - nvram_tuple_t *t, **prev; - - if (!name) - return 0; - - /* Hash the name */ - i = hash(name) % NVRAM_ARRAYSIZE(h->nvram_hash); - - /* Find the associated tuple in the hash table */ - for (prev = &h->nvram_hash[i], t = *prev; - t && strcmp(t->name, name); prev = &t->next, t = *prev); - - /* Move it to the dead table */ - if (t) { - *prev = t->next; - t->next = h->nvram_dead; - h->nvram_dead = t; - } - - return 0; -} - -/* Get all NVRAM variables. */ -nvram_tuple_t * nvram_getall(nvram_handle_t *h) -{ - int i; - nvram_tuple_t *t, *l, *x; - - l = NULL; - - for (i = 0; i < NVRAM_ARRAYSIZE(h->nvram_hash); i++) { - for (t = h->nvram_hash[i]; t; t = t->next) { - if( (x = (nvram_tuple_t *) malloc(sizeof(nvram_tuple_t))) != NULL ) - { - x->name = t->name; - x->value = t->value; - x->next = l; - l = x; - } - else - { - break; - } - } - } - - return l; -} - -/* Regenerate NVRAM. */ -int nvram_commit(nvram_handle_t *h) -{ - nvram_header_t *header = nvram_header(h); - char *init, *config, *refresh, *ncdl; - char *ptr, *end; - int i; - nvram_tuple_t *t; - nvram_header_t tmp; - uint8_t crc; - - /* Regenerate header */ - header->magic = NVRAM_MAGIC; - header->crc_ver_init = (NVRAM_VERSION << 8); - if (!(init = nvram_get(h, "sdram_init")) || - !(config = nvram_get(h, "sdram_config")) || - !(refresh = nvram_get(h, "sdram_refresh")) || - !(ncdl = nvram_get(h, "sdram_ncdl"))) { - header->crc_ver_init |= SDRAM_INIT << 16; - header->config_refresh = SDRAM_CONFIG; - header->config_refresh |= SDRAM_REFRESH << 16; - header->config_ncdl = 0; - } else { - header->crc_ver_init |= (strtoul(init, NULL, 0) & 0xffff) << 16; - header->config_refresh = strtoul(config, NULL, 0) & 0xffff; - header->config_refresh |= (strtoul(refresh, NULL, 0) & 0xffff) << 16; - header->config_ncdl = strtoul(ncdl, NULL, 0); - } - - /* Clear data area */ - ptr = (char *) header + sizeof(nvram_header_t); - memset(ptr, 0xFF, NVRAM_SPACE - sizeof(nvram_header_t)); - memset(&tmp, 0, sizeof(nvram_header_t)); - - /* Leave space for a double NUL at the end */ - end = (char *) header + NVRAM_SPACE - 2; - - /* Write out all tuples */ - for (i = 0; i < NVRAM_ARRAYSIZE(h->nvram_hash); i++) { - for (t = h->nvram_hash[i]; t; t = t->next) { - if ((ptr + strlen(t->name) + 1 + strlen(t->value) + 1) > end) - break; - ptr += sprintf(ptr, "%s=%s", t->name, t->value) + 1; - } - } - - /* End with a double NULL and pad to 4 bytes */ - *ptr = '\0'; - ptr++; - - if( (int)ptr % 4 ) - memset(ptr, 0, 4 - ((int)ptr % 4)); - - ptr++; - - /* Set new length */ - header->len = NVRAM_ROUNDUP(ptr - (char *) header, 4); - - /* Little-endian CRC8 over the last 11 bytes of the header */ - tmp.crc_ver_init = header->crc_ver_init; - tmp.config_refresh = header->config_refresh; - tmp.config_ncdl = header->config_ncdl; - crc = hndcrc8((unsigned char *) &tmp + NVRAM_CRC_START_POSITION, - sizeof(nvram_header_t) - NVRAM_CRC_START_POSITION, 0xff); - - /* Continue CRC8 over data bytes */ - crc = hndcrc8((unsigned char *) &header[0] + sizeof(nvram_header_t), - header->len - sizeof(nvram_header_t), crc); - - /* Set new CRC8 */ - header->crc_ver_init |= crc; - - /* Write out */ - msync(h->mmap, h->length, MS_SYNC); - fsync(h->fd); - - /* Reinitialize hash table */ - return _nvram_rehash(h); -} - -/* Open NVRAM and obtain a handle. */ -nvram_handle_t * nvram_open(const char *file, int rdonly) -{ - int fd; - char *mtd = NULL; - nvram_handle_t *h; - nvram_header_t *header; - - /* If erase size or file are undefined then try to define them */ - if( (nvram_erase_size == 0) || (file == NULL) ) - { - /* Finding the mtd will set the appropriate erase size */ - if( (mtd = nvram_find_mtd()) == NULL || nvram_erase_size == 0 ) - { - free(mtd); - return NULL; - } - } - - if( (fd = open(file ? file : mtd, O_RDWR)) > -1 ) - { - char *mmap_area = (char *) mmap( - NULL, nvram_erase_size, PROT_READ | PROT_WRITE, - ( rdonly == NVRAM_RO ) ? MAP_PRIVATE : MAP_SHARED, fd, 0); - - if( mmap_area != MAP_FAILED ) - { - memset(mmap_area, 0xFF, NVRAM_START(nvram_erase_size)); - - if((h = (nvram_handle_t *) malloc(sizeof(nvram_handle_t))) != NULL) - { - memset(h, 0, sizeof(nvram_handle_t)); - - h->fd = fd; - h->mmap = mmap_area; - h->length = nvram_erase_size; - - header = nvram_header(h); - - if( header->magic == NVRAM_MAGIC ) - { - _nvram_rehash(h); - free(mtd); - return h; - } - else - { - munmap(h->mmap, h->length); - free(h); - } - } - } - } - - free(mtd); - return NULL; -} - -/* Close NVRAM and free memory. */ -int nvram_close(nvram_handle_t *h) -{ - _nvram_free(h); - munmap(h->mmap, h->length); - close(h->fd); - free(h); - - return 0; -} - -/* Determine NVRAM device node. */ -char * nvram_find_mtd(void) -{ - FILE *fp; - int i, esz; - char dev[PATH_MAX]; - char *path = NULL; - struct stat s; - - if( (fp = fopen("/proc/mtd", "r")) ) - { - while( fgets(dev, sizeof(dev), fp) ) - { - if( strstr(dev, "nvram") && sscanf(dev, "mtd%d: %08x", &i, &esz) ) - { - nvram_erase_size = esz; - - sprintf(dev, "/dev/mtdblock/%d", i); - if( stat(dev, &s) > -1 && (s.st_mode & S_IFBLK) ) - { - if( (path = (char *) malloc(strlen(dev)+1)) != NULL ) - { - strncpy(path, dev, strlen(dev)+1); - break; - } - } - else - { - sprintf(dev, "/dev/mtdblock%d", i); - if( stat(dev, &s) > -1 && (s.st_mode & S_IFBLK) ) - { - if( (path = (char *) malloc(strlen(dev)+1)) != NULL ) - { - strncpy(path, dev, strlen(dev)+1); - break; - } - } - } - } - } - fclose(fp); - } - - return path; -} - -/* Check NVRAM staging file. */ -char * nvram_find_staging(void) -{ - struct stat s; - - if( (stat(NVRAM_STAGING, &s) > -1) && (s.st_mode & S_IFREG) ) - { - return NVRAM_STAGING; - } - - return NULL; -} - -/* Copy NVRAM contents to staging file. */ -int nvram_to_staging(void) -{ - int fdmtd, fdstg, stat; - char *mtd = nvram_find_mtd(); - char buf[nvram_erase_size]; - - stat = -1; - - if( (mtd != NULL) && (nvram_erase_size > 0) ) - { - if( (fdmtd = open(mtd, O_RDONLY)) > -1 ) - { - if( read(fdmtd, buf, sizeof(buf)) == sizeof(buf) ) - { - if((fdstg = open(NVRAM_STAGING, O_WRONLY | O_CREAT, 0600)) > -1) - { - write(fdstg, buf, sizeof(buf)); - fsync(fdstg); - close(fdstg); - - stat = 0; - } - } - - close(fdmtd); - } - } - - free(mtd); - return stat; -} - -/* Copy staging file to NVRAM device. */ -int staging_to_nvram(void) -{ - int fdmtd, fdstg, stat; - char *mtd = nvram_find_mtd(); - char buf[nvram_erase_size]; - - stat = -1; - - if( (mtd != NULL) && (nvram_erase_size > 0) ) - { - if( (fdstg = open(NVRAM_STAGING, O_RDONLY)) > -1 ) - { - if( read(fdstg, buf, sizeof(buf)) == sizeof(buf) ) - { - if( (fdmtd = open(mtd, O_WRONLY | O_SYNC)) > -1 ) - { - write(fdmtd, buf, sizeof(buf)); - fsync(fdmtd); - close(fdmtd); - stat = 0; - } - } - - close(fdstg); - - if( !stat ) - stat = unlink(NVRAM_STAGING) ? 1 : 0; - } - } - - free(mtd); - return stat; -} |