/*
- * NVRAM variable manipulation (Linux user mode half)
+ * 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
*
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <error.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <sys/mman.h>
+#include "nvram.h"
+
+#define TRACE(msg) \
+ printf("%s(%i) in %s(): %s\n", \
+ __FILE__, __LINE__, __FUNCTION__, msg ? msg : "?")
-#include <typedefs.h>
-#include <bcmnvram.h>
-#include <shutils.h>
+size_t nvram_erase_size = 0;
-#define PATH_DEV_NVRAM "/dev/nvram"
-/* Globals */
-static int nvram_fd = -1;
-static char *nvram_buf = NULL;
-int file_to_buf(char *path, char *buf, int len);
+/*
+ * -- Helper functions --
+ */
-int
-nvram_init(void *unused)
+/* String hash */
+static uint32_t hash(const char *s)
{
- if ((nvram_fd = open(PATH_DEV_NVRAM, O_RDWR)) < 0)
- goto err;
+ uint32_t hash = 0;
+
+ while (*s)
+ hash = 31 * hash + *s++;
- /* Map kernel string buffer into user space */
- if ((nvram_buf = mmap(NULL, NVRAM_SPACE, PROT_READ, MAP_SHARED, nvram_fd, 0)) == MAP_FAILED) {
- close(nvram_fd);
- nvram_fd = -1;
- goto err;
+ 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;
}
- return 0;
+ /* Free dead table */
+ for (t = h->nvram_dead; t; t = next) {
+ next = t->next;
+ free(t);
+ }
- err:
- perror(PATH_DEV_NVRAM);
- return errno;
+ h->nvram_dead = NULL;
}
-char *
-nvram_get(const char *name)
+/* (Re)allocate NVRAM tuples. */
+static nvram_tuple_t * _nvram_realloc( nvram_handle_t *h, nvram_tuple_t *t,
+ const char *name, const char *value )
{
- size_t count = strlen(name) + 1;
- char tmp[100], *value;
- unsigned long *off = (unsigned long *) tmp;
+ if ((strlen(value) + 1) > NVRAM_SPACE)
+ return NULL;
- if (nvram_fd < 0)
- if (nvram_init(NULL))
+ if (!t) {
+ if (!(t = malloc(sizeof(nvram_tuple_t) + strlen(name) + 1)))
return NULL;
- if (count > sizeof(tmp)) {
- if (!(off = malloc(count)))
+ /* 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);
}
- /* Get offset into mmap() space */
- strcpy((char *) off, name);
+ return 0;
+}
- count = read(nvram_fd, off, count);
- if (count == sizeof(unsigned long))
- value = &nvram_buf[*off];
- else
- value = NULL;
+/*
+ * -- Public functions --
+ */
- if (count < 0)
- perror(PATH_DEV_NVRAM);
+/* 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 (off != (unsigned long *) tmp)
- free(off);
+ 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;
}
-int
-nvram_getall(char *buf, int count)
+/* Set the value of an NVRAM variable. */
+int nvram_set(nvram_handle_t *h, const char *name, const char *value)
{
- int ret;
+ 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;
+ }
- if (nvram_fd < 0)
- if ((ret = nvram_init(NULL)))
- return ret;
+ /* Add new tuple to the hash table */
+ u->next = h->nvram_hash[i];
+ h->nvram_hash[i] = u;
- if (count == 0)
+ 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;
- /* Get all variables */
- *buf = '\0';
+ /* Hash the name */
+ i = hash(name) % NVRAM_ARRAYSIZE(h->nvram_hash);
- ret = read(nvram_fd, buf, count);
+ /* 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);
- if (ret < 0)
- perror(PATH_DEV_NVRAM);
+ /* Move it to the dead table */
+ if (t) {
+ *prev = t->next;
+ t->next = h->nvram_dead;
+ h->nvram_dead = t;
+ }
- return (ret == count) ? 0 : ret;
+ return 0;
}
-int
-nvram_set(const char *name, const char *value)
+/* Get all NVRAM variables. */
+nvram_tuple_t * nvram_getall(nvram_handle_t *h)
{
- size_t count = strlen(name) + 1;
- char tmp[100], *buf = tmp;
- int ret;
+ 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;
+ }
+ }
+ }
- if (nvram_fd < 0)
- if ((ret = nvram_init(NULL)))
- return ret;
+ return l;
+}
- /* Unset if value is NULL */
- if (value)
- count += strlen(value) + 1;
+/* 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);
+ }
- if (count > sizeof(tmp)) {
- if (!(buf = malloc(count)))
- return -ENOMEM;
+ /* 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;
+ }
}
- if (value)
- sprintf(buf, "%s=%s", name, value);
- else
- strcpy(buf, name);
+ /* End with a double NULL and pad to 4 bytes */
+ *ptr = '\0';
+ ptr++;
- ret = write(nvram_fd, buf, count);
+ if( (int)ptr % 4 )
+ memset(ptr, 0, 4 - ((int)ptr % 4));
- if (ret < 0)
- perror(PATH_DEV_NVRAM);
+ ptr++;
- if (buf != tmp)
- free(buf);
+ /* Set new length */
+ header->len = NVRAM_ROUNDUP(ptr - (char *) header, 4);
- return (ret == count) ? 0 : ret;
-}
+ /* 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);
-int
-nvram_unset(const char *name)
-{
- return nvram_set(name, NULL);
+ /* 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);
}
-int
-nvram_commit(void)
+/* Open NVRAM and obtain a handle. */
+nvram_handle_t * nvram_open(const char *file, int rdonly)
{
- int ret;
-
- if (nvram_fd < 0)
- if ((ret = nvram_init(NULL)))
- return ret;
+ 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;
+ }
+ }
- ret = ioctl(nvram_fd, NVRAM_MAGIC, 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;
+}
- if (ret < 0)
- perror(PATH_DEV_NVRAM);
+/* 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 ret;
+ return 0;
}
-int
-file_to_buf(char *path, char *buf, int len)
+/* 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;
- memset(buf, 0 , len);
+ fclose(fp);
+ }
- if ((fp = fopen(path, "r"))) {
- fgets(buf, len, 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 1;
}
- return 0;
+ 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;
}
projects / openwrt.git / blobdiff