hsist
/
freifunkist-firmware
6
1
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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

Browse Source 
SVN-Revision: 15426
master
Jo-Philipp Wich 16 years ago
parent 70c8870f64
commit 400c1a7fbf
7 changed files with 1051 additions and 0 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 50
      package/unvram/Makefile
  2. 33
      package/unvram/src/Makefile
  3. 233
      package/unvram/src/cli.c
  4. 69
      package/unvram/src/crc.c
  5. 511
      package/unvram/src/nvram.c
  6. 125
      package/unvram/src/nvram.h
  7. 30
      package/unvram/src/sdinitvals.h

50
package/unvram/Makefile
Unescape View File

@ -0,0 +1,50 @@
#
# 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))

33
package/unvram/src/Makefile
Unescape View File

@ -0,0 +1,33 @@
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
Unescape View File

@ -0,0 +1,233 @@
/*
* 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;
}

69
package/unvram/src/crc.c
Unescape View File

@ -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;
}

511
package/unvram/src/nvram.c
Unescape View File

@ -0,0 +1,511 @@
/*
* 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;
}

125
package/unvram/src/nvram.h
Unescape View File

@ -0,0 +1,125 @@
/*
* 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_ */

30
package/unvram/src/sdinitvals.h
Unescape View File

@ -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_ */
Write Preview
Loading…
Cancel
Save