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Add unvram, a nvram manipulation tool suitable for brcm-2.4 and bcm47xx platforms

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SVN-Revision: 15426
This commit is contained in:
Jo-Philipp Wich 2009-04-26 14:54:05 +00:00
parent 70c8870f64
commit 400c1a7fbf
7 changed files with 1051 additions and 0 deletions
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50
package/unvram/Makefile Normal file
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#
# Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk
PKG_NAME:=unvram
PKG_RELEASE:=1
PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
include $(INCLUDE_DIR)/package.mk
define Package/unvram
SECTION:=utils
CATEGORY:=Base system
TITLE:=Userspace port of the Broadcom NVRAM manipulation tool
endef
define Package/unvram/description
This package contains an utility to manipulate NVRAM on Broadcom based devices.
It works on both brcm-2.4 and bcm47xx (Linux 2.6) without using the kernel api.
endef
define Build/Prepare
mkdir -p $(PKG_BUILD_DIR)
$(CP) ./src/* $(PKG_BUILD_DIR)/
endef
define Build/Configure
endef
define Build/Compile
$(MAKE) -C $(PKG_BUILD_DIR) \
CC="$(TARGET_CC)" \
CFLAGS="$(TARGET_CFLAGS) -Wall" \
LDFLAGS="$(TARGET_LDFLAGS)"
endef
define Package/unvram/install
$(INSTALL_DIR) $(1)/sbin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/unvram $(1)/sbin/
$(INSTALL_DIR) $(1)/usr/lib
$(INSTALL_BIN) $(PKG_BUILD_DIR)/libnvram.so.0.1 $(1)/usr/lib/
endef
$(eval $(call BuildPackage,unvram))

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package/unvram/src/Makefile Normal file
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CLI_FILENAME = unvram
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 nvram $(LIB_FILENAME)* *.o

233
package/unvram/src/cli.c Normal file
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/*
* 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("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") && ++i < argc )
{
stat = do_get(nvram, argv[i]);
done++;
}
else if( !strcmp(argv[i], "unset") && ++i < argc )
{
stat = do_unset(nvram, argv[i]);
done++;
}
else if( !strcmp(argv[i], "set") && ++i < argc )
{
stat = do_set(nvram, argv[i]);
done++;
}
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;
}

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package/unvram/src/crc.c Normal file
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#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;
}

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package/unvram/src/nvram.c Normal file
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/*
* 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;
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( file == NULL )
file = nvram_find_mtd();
else
(void) nvram_find_mtd();
if( nvram_erase_size == 0 )
return NULL;
}
if( (fd = open(file, 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);
return h;
}
else
{
munmap(h->mmap, h->length);
free(h);
}
}
}
}
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. */
const char * nvram_find_mtd(void)
{
FILE *fp;
int i, esz;
char dev[PATH_MAX];
char *path = NULL;
// "/dev/mtdblock/" + ( 0 < x < 99 ) + \0 = 19
if( (path = (char *) malloc(19)) == NULL )
return NULL;
if ((fp = fopen("/proc/mtd", "r"))) {
while (fgets(dev, sizeof(dev), fp)) {
if (strstr(dev, "nvram") && sscanf(dev, "mtd%d: %08x", &i, &esz)) {
if( (path = (char *) malloc(19)) != NULL )
{
nvram_erase_size = esz;
snprintf(path, 19, "/dev/mtdblock/%d", i);
break;
}
}
}
fclose(fp);
}
return path;
}
/* Check NVRAM staging file. */
const 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;
const 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);
}
}
return stat;
}
/* Copy staging file to NVRAM device. */
int staging_to_nvram(void)
{
int fdmtd, fdstg, stat;
const 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;
}
}
return stat;
}

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/*
* 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 <sys/ioctl.h>
#include <arpa/inet.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 long length;
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. */
const 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. */
const 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_START(x) x - NVRAM_SPACE
#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
#define NVRAM_VERSION 1
#define NVRAM_CRC_START_POSITION 9 /* magic, len, crc8 to be skipped */
#endif /* _nvram_h_ */

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/*
* 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_ */