diff options
Diffstat (limited to 'package/nvram/src')
| -rw-r--r-- | package/nvram/src/Makefile | 33 | ||||
| -rw-r--r-- | package/nvram/src/cli.c | 246 | ||||
| -rw-r--r-- | package/nvram/src/crc.c | 69 | ||||
| -rw-r--r-- | package/nvram/src/nvram.c | 556 | ||||
| -rw-r--r-- | package/nvram/src/nvram.h | 123 | ||||
| -rw-r--r-- | package/nvram/src/sdinitvals.h | 30 |
6 files changed, 1057 insertions, 0 deletions
diff --git a/package/nvram/src/Makefile b/package/nvram/src/Makefile new file mode 100644 index 000000000..4872728ba --- /dev/null +++ b/package/nvram/src/Makefile @@ -0,0 +1,33 @@ +CLI_FILENAME = nvram + +LIB_VERMAJOR = 0 +LIB_VERMINOR = 1 +LIB_FILENAME = libnvram.so + +LIB_CFLAGS = $(CFLAGS) -shared -fPIC +LIB_LDFLAGS = $(LDFLAGS) -Wl,-soname,$(LIB_FILENAME).$(LIB_VERMAJOR).$(LIB_VERMINOR) + +CLI_CFLAGS = $(CFLAGS) +CLI_LDFLAGS = $(LDFLAGS) + +CLI_OBJ = cli.o +LIB_OBJ = crc.o nvram.o + +all: cli libnvram + +cli: libnvram + $(CC) $(CLI_CFLAGS) -c -o cli.o cli.c + $(CC) -o $(CLI_FILENAME) $(CLI_LDFLAGS) $(CLI_OBJ) \ + $(LIB_FILENAME).$(LIB_VERMAJOR).$(LIB_VERMINOR) + +cli.o: cli.c + $(CC) $(CLI_CFLAGS) -c -o $@ $< + +libnvram: + $(CC) $(LIB_CFLAGS) -c -o crc.o crc.c + $(CC) $(LIB_CFLAGS) -c -o nvram.o nvram.c + $(CC) $(LIB_CFLAGS) $(LIB_LDFLAGS) \ + -o $(LIB_FILENAME).$(LIB_VERMAJOR).$(LIB_VERMINOR) $(LIB_OBJ) + +clean: + rm -f $(CLI_FILENAME) $(LIB_FILENAME)* *.o diff --git a/package/nvram/src/cli.c b/package/nvram/src/cli.c new file mode 100644 index 000000000..66ef90488 --- /dev/null +++ b/package/nvram/src/cli.c @@ -0,0 +1,246 @@ +/* + * Command line interface for libnvram + * + * Copyright 2009, Jo-Philipp Wich <xm@subsignal.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * + * The libnvram code is based on Broadcom code for Linux 2.4.x . + * + */ + +#include "nvram.h" + + +static nvram_handle_t * nvram_open_rdonly(void) +{ + const char *file = nvram_find_staging(); + + if( file == NULL ) + file = nvram_find_mtd(); + + if( file != NULL ) + return nvram_open(file, NVRAM_RO); + + return NULL; +} + +static nvram_handle_t * nvram_open_staging(void) +{ + if( nvram_find_staging() != NULL || nvram_to_staging() == 0 ) + return nvram_open(NVRAM_STAGING, NVRAM_RW); + + return NULL; +} + +static int do_show(nvram_handle_t *nvram) +{ + nvram_tuple_t *t; + int stat = 1; + + if( (t = nvram_getall(nvram)) != NULL ) + { + while( t ) + { + printf("%s=%s\n", t->name, t->value); + t = t->next; + } + + stat = 0; + } + + return stat; +} + +static int do_get(nvram_handle_t *nvram, const char *var) +{ + const char *val; + int stat = 1; + + if( (val = nvram_get(nvram, var)) != NULL ) + { + printf("%s\n", val); + stat = 0; + } + + return stat; +} + +static int do_unset(nvram_handle_t *nvram, const char *var) +{ + return nvram_unset(nvram, var); +} + +static int do_set(nvram_handle_t *nvram, const char *pair) +{ + char *val = strstr(pair, "="); + char var[strlen(pair)]; + int stat = 1; + + if( val != NULL ) + { + memset(var, 0, sizeof(var)); + strncpy(var, pair, (int)(val-pair)); + stat = nvram_set(nvram, var, (char *)(val + 1)); + } + + return stat; +} + +static int do_info(nvram_handle_t *nvram) +{ + nvram_header_t *hdr = nvram_header(nvram); + + /* CRC8 over the last 11 bytes of the header and data bytes */ + uint8_t crc = hndcrc8((unsigned char *) &hdr[0] + NVRAM_CRC_START_POSITION, + hdr->len - NVRAM_CRC_START_POSITION, 0xff); + + /* Show info */ + printf("Magic: 0x%08X\n", hdr->magic); + printf("Length: 0x%08X\n", hdr->len); + printf("Offset: 0x%08X\n", nvram->offset); + + printf("CRC8: 0x%02X (calculated: 0x%02X)\n", + hdr->crc_ver_init & 0xFF, crc); + + printf("Version: 0x%02X\n", (hdr->crc_ver_init >> 8) & 0xFF); + printf("SDRAM init: 0x%04X\n", (hdr->crc_ver_init >> 16) & 0xFFFF); + printf("SDRAM config: 0x%04X\n", hdr->config_refresh & 0xFFFF); + printf("SDRAM refresh: 0x%04X\n", (hdr->config_refresh >> 16) & 0xFFFF); + printf("NCDL values: 0x%08X\n\n", hdr->config_ncdl); + + printf("%i bytes used / %i bytes available (%.2f%%)\n", + hdr->len, NVRAM_SPACE - hdr->len, + (100.00 / (double)NVRAM_SPACE) * (double)hdr->len); + + return 0; +} + + +int main( int argc, const char *argv[] ) +{ + nvram_handle_t *nvram; + int commit = 0; + int write = 0; + int stat = 1; + int done = 0; + int i; + + /* Ugly... iterate over arguments to see whether we can expect a write */ + for( i = 1; i < argc; i++ ) + if( ( !strcmp(argv[i], "set") && ++i < argc ) || + ( !strcmp(argv[i], "unset") && ++i < argc ) || + !strcmp(argv[i], "commit") ) + { + write = 1; + break; + } + + + nvram = write ? nvram_open_staging() : nvram_open_rdonly(); + + if( nvram != NULL && argc > 1 ) + { + for( i = 1; i < argc; i++ ) + { + if( !strcmp(argv[i], "show") ) + { + stat = do_show(nvram); + done++; + } + else if( !strcmp(argv[i], "info") ) + { + stat = do_info(nvram); + done++; + } + else if( !strcmp(argv[i], "get") || !strcmp(argv[i], "unset") || !strcmp(argv[i], "set") ) + { + if( (i+1) < argc ) + { + switch(argv[i++][0]) + { + case 'g': + stat = do_get(nvram, argv[i]); + break; + + case 'u': + stat = do_unset(nvram, argv[i]); + break; + + case 's': + stat = do_set(nvram, argv[i]); + break; + } + done++; + } + else + { + fprintf(stderr, "Command '%s' requires an argument!\n", argv[i]); + done = 0; + break; + } + } + else if( !strcmp(argv[i], "commit") ) + { + commit = 1; + done++; + } + else + { + fprintf(stderr, "Unknown option '%s' !\n", argv[i]); + done = 0; + break; + } + } + + if( write ) + stat = nvram_commit(nvram); + + nvram_close(nvram); + + if( commit ) + stat = staging_to_nvram(); + } + + if( !nvram ) + { + fprintf(stderr, + "Could not open nvram! Possible reasons are:\n" + " - No device found (/proc not mounted or no nvram present)\n" + " - Insufficient permissions to open mtd device\n" + " - Insufficient memory to complete operation\n" + " - Memory mapping failed or not supported\n" + ); + + stat = 1; + } + else if( !done ) + { + fprintf(stderr, + "Usage:\n" + " nvram show\n" + " nvram info\n" + " nvram get variable\n" + " nvram set variable=value [set ...]\n" + " nvram unset variable [unset ...]\n" + " nvram commit\n" + ); + + stat = 1; + } + + return stat; +} diff --git a/package/nvram/src/crc.c b/package/nvram/src/crc.c new file mode 100644 index 000000000..22a36652a --- /dev/null +++ b/package/nvram/src/crc.c @@ -0,0 +1,69 @@ +#include "nvram.h" + +/******************************************************************************* + * crc8 + * + * Computes a crc8 over the input data using the polynomial: + * + * x^8 + x^7 +x^6 + x^4 + x^2 + 1 + * + * The caller provides the initial value (either CRC8_INIT_VALUE + * or the previous returned value) to allow for processing of + * discontiguous blocks of data. When generating the CRC the + * caller is responsible for complementing the final return value + * and inserting it into the byte stream. When checking, a final + * return value of CRC8_GOOD_VALUE indicates a valid CRC. + * + * Reference: Dallas Semiconductor Application Note 27 + * Williams, Ross N., "A Painless Guide to CRC Error Detection Algorithms", + * ver 3, Aug 1993, ross@guest.adelaide.edu.au, Rocksoft Pty Ltd., + * ftp://ftp.rocksoft.com/clients/rocksoft/papers/crc_v3.txt + * + * **************************************************************************** + */ + +static const uint8_t crc8_table[256] = { + 0x00, 0xF7, 0xB9, 0x4E, 0x25, 0xD2, 0x9C, 0x6B, + 0x4A, 0xBD, 0xF3, 0x04, 0x6F, 0x98, 0xD6, 0x21, + 0x94, 0x63, 0x2D, 0xDA, 0xB1, 0x46, 0x08, 0xFF, + 0xDE, 0x29, 0x67, 0x90, 0xFB, 0x0C, 0x42, 0xB5, + 0x7F, 0x88, 0xC6, 0x31, 0x5A, 0xAD, 0xE3, 0x14, + 0x35, 0xC2, 0x8C, 0x7B, 0x10, 0xE7, 0xA9, 0x5E, + 0xEB, 0x1C, 0x52, 0xA5, 0xCE, 0x39, 0x77, 0x80, + 0xA1, 0x56, 0x18, 0xEF, 0x84, 0x73, 0x3D, 0xCA, + 0xFE, 0x09, 0x47, 0xB0, 0xDB, 0x2C, 0x62, 0x95, + 0xB4, 0x43, 0x0D, 0xFA, 0x91, 0x66, 0x28, 0xDF, + 0x6A, 0x9D, 0xD3, 0x24, 0x4F, 0xB8, 0xF6, 0x01, + 0x20, 0xD7, 0x99, 0x6E, 0x05, 0xF2, 0xBC, 0x4B, + 0x81, 0x76, 0x38, 0xCF, 0xA4, 0x53, 0x1D, 0xEA, + 0xCB, 0x3C, 0x72, 0x85, 0xEE, 0x19, 0x57, 0xA0, + 0x15, 0xE2, 0xAC, 0x5B, 0x30, 0xC7, 0x89, 0x7E, + 0x5F, 0xA8, 0xE6, 0x11, 0x7A, 0x8D, 0xC3, 0x34, + 0xAB, 0x5C, 0x12, 0xE5, 0x8E, 0x79, 0x37, 0xC0, + 0xE1, 0x16, 0x58, 0xAF, 0xC4, 0x33, 0x7D, 0x8A, + 0x3F, 0xC8, 0x86, 0x71, 0x1A, 0xED, 0xA3, 0x54, + 0x75, 0x82, 0xCC, 0x3B, 0x50, 0xA7, 0xE9, 0x1E, + 0xD4, 0x23, 0x6D, 0x9A, 0xF1, 0x06, 0x48, 0xBF, + 0x9E, 0x69, 0x27, 0xD0, 0xBB, 0x4C, 0x02, 0xF5, + 0x40, 0xB7, 0xF9, 0x0E, 0x65, 0x92, 0xDC, 0x2B, + 0x0A, 0xFD, 0xB3, 0x44, 0x2F, 0xD8, 0x96, 0x61, + 0x55, 0xA2, 0xEC, 0x1B, 0x70, 0x87, 0xC9, 0x3E, + 0x1F, 0xE8, 0xA6, 0x51, 0x3A, 0xCD, 0x83, 0x74, + 0xC1, 0x36, 0x78, 0x8F, 0xE4, 0x13, 0x5D, 0xAA, + 0x8B, 0x7C, 0x32, 0xC5, 0xAE, 0x59, 0x17, 0xE0, + 0x2A, 0xDD, 0x93, 0x64, 0x0F, 0xF8, 0xB6, 0x41, + 0x60, 0x97, 0xD9, 0x2E, 0x45, 0xB2, 0xFC, 0x0B, + 0xBE, 0x49, 0x07, 0xF0, 0x9B, 0x6C, 0x22, 0xD5, + 0xF4, 0x03, 0x4D, 0xBA, 0xD1, 0x26, 0x68, 0x9F +}; + +uint8_t hndcrc8 ( + uint8_t * pdata, /* pointer to array of data to process */ + uint32_t nbytes, /* number of input data bytes to process */ + uint8_t crc /* either CRC8_INIT_VALUE or previous return value */ +) { + while (nbytes-- > 0) + crc = crc8_table[(crc ^ *pdata++) & 0xff]; + + return crc; +} diff --git a/package/nvram/src/nvram.c b/package/nvram/src/nvram.c new file mode 100644 index 000000000..a0bc006d1 --- /dev/null +++ b/package/nvram/src/nvram.c @@ -0,0 +1,556 @@ +/* + * NVRAM variable manipulation (common) + * + * Copyright 2004, Broadcom Corporation + * Copyright 2009-2010, 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[h->offset]; +} + +/* 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 i; + int fd; + char *mtd = NULL; + nvram_handle_t *h; + nvram_header_t *header; + int offset = -1; + + /* 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) | MAP_LOCKED, fd, 0); + + if( mmap_area != MAP_FAILED ) + { + for( i = 0; i <= ((nvram_erase_size - NVRAM_SPACE) / sizeof(uint32_t)); i++ ) + { + if( ((uint32_t *)mmap_area)[i] == NVRAM_MAGIC ) + { + offset = i * sizeof(uint32_t); + break; + } + } + + if( offset < 0 ) + { + free(mtd); + return NULL; + } + else if( (h = 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; + h->offset = offset; + + 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; + int supported = 1; + + /* Refuse any operation on the WGT634U */ + if( (fp = fopen("/proc/diag/model", "r")) ) + { + if( fgets(dev, sizeof(dev), fp) && !strncmp(dev, "Netgear WGT634U", 15) ) + supported = 0; + + fclose(fp); + } + + if( supported && (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; +} diff --git a/package/nvram/src/nvram.h b/package/nvram/src/nvram.h new file mode 100644 index 000000000..c72f67e9a --- /dev/null +++ b/package/nvram/src/nvram.h @@ -0,0 +1,123 @@ +/* + * NVRAM variable manipulation + * + * Copyright 2007, 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. + * + */ + +#ifndef _nvram_h_ +#define _nvram_h_ + +#include <stdint.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <linux/limits.h> + +#include "sdinitvals.h" + + +struct nvram_header { + uint32_t magic; + uint32_t len; + uint32_t crc_ver_init; /* 0:7 crc, 8:15 ver, 16:31 sdram_init */ + uint32_t config_refresh; /* 0:15 sdram_config, 16:31 sdram_refresh */ + uint32_t config_ncdl; /* ncdl values for memc */ +} __attribute__((__packed__)); + +struct nvram_tuple { + char *name; + char *value; + struct nvram_tuple *next; +}; + +struct nvram_handle { + int fd; + char *mmap; + unsigned int length; + unsigned int offset; + struct nvram_tuple *nvram_hash[257]; + struct nvram_tuple *nvram_dead; +}; + +typedef struct nvram_handle nvram_handle_t; +typedef struct nvram_header nvram_header_t; +typedef struct nvram_tuple nvram_tuple_t; + + +/* Get nvram header. */ +nvram_header_t * nvram_header(nvram_handle_t *h); + +/* Set the value of an NVRAM variable */ +int nvram_set(nvram_handle_t *h, const char *name, const char *value); + +/* Get the value of an NVRAM variable. */ +char * nvram_get(nvram_handle_t *h, const char *name); + +/* Unset the value of an NVRAM variable. */ +int nvram_unset(nvram_handle_t *h, const char *name); + +/* Get all NVRAM variables. */ +nvram_tuple_t * nvram_getall(nvram_handle_t *h); + +/* Regenerate NVRAM. */ +int nvram_commit(nvram_handle_t *h); + +/* Open NVRAM and obtain a handle. */ +nvram_handle_t * nvram_open(const char *file, int rdonly); + +/* Close NVRAM and free memory. */ +int nvram_close(nvram_handle_t *h); + +/* Get the value of an NVRAM variable in a safe way, use "" instead of NULL. */ +#define nvram_safe_get(h, name) (nvram_get(h, name) ? : "") + +/* Computes a crc8 over the input data. */ +uint8_t hndcrc8 (uint8_t * pdata, uint32_t nbytes, uint8_t crc); + +/* Returns the crc value of the nvram. */ +uint8_t nvram_calc_crc(nvram_header_t * nvh); + +/* Determine NVRAM device node. */ +char * nvram_find_mtd(void); + +/* Copy NVRAM contents to staging file. */ +int nvram_to_staging(void); + +/* Copy staging file to NVRAM device. */ +int staging_to_nvram(void); + +/* Check NVRAM staging file. */ +char * nvram_find_staging(void); + + +/* Staging file for NVRAM */ +#define NVRAM_STAGING "/tmp/.nvram" +#define NVRAM_RO 1 +#define NVRAM_RW 0 + +/* Helper macros */ +#define NVRAM_ARRAYSIZE(a) sizeof(a)/sizeof(a[0]) +#define NVRAM_ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y)) + +/* NVRAM constants */ +#define NVRAM_SPACE 0x8000 +#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */ +#define NVRAM_VERSION 1 + +#define NVRAM_CRC_START_POSITION 9 /* magic, len, crc8 to be skipped */ + + +#endif /* _nvram_h_ */ diff --git a/package/nvram/src/sdinitvals.h b/package/nvram/src/sdinitvals.h new file mode 100644 index 000000000..5a289adec --- /dev/null +++ b/package/nvram/src/sdinitvals.h @@ -0,0 +1,30 @@ +/* + * SDRAM init values + * + * Copyright 2007, 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. + * + */ + +#ifndef _sdinitvals_h_ +#define _sdinitvals_h_ + +/* SDRAM refresh control (refresh) register bits */ +#define SDRAM_REF(p) (((p)&0xff) | SDRAM_REF_EN) /* Refresh period */ +#define SDRAM_REF_EN 0x8000 /* Writing 1 enables periodic refresh */ + +/* SDRAM Core default Init values (OCP ID 0x803) */ +#define MEM4MX16X2 0x419 /* 16 MB */ + +#define SDRAM_INIT MEM4MX16X2 +#define SDRAM_BURSTFULL 0x0000 /* Use full page bursts */ +#define SDRAM_CONFIG SDRAM_BURSTFULL +#define SDRAM_REFRESH SDRAM_REF(0x40) + +#endif /* _sdinitvals_h_ */ |