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[nvram2env] fix nvram2env to scan all of memory, not 1/4th

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The variable "size" stores number of words (4bytes). But the loop over
memory uses size as number of bytes to scan memory. As result it fetches
only 1/4th of memory.

This patch solves this problem and nvram2env fetches all NVRAM variables.

Test plan:

Pre-requisites: any MIPS board with ASCII-based NVRAM mapped into memory

* Add "device nvram2env" into kernel configuration
* Specify hints: base is mandatory (according to nvram2env(4))

hint.nvram.0.base=0x1c7f8000 (it's valid address for Asus RT-N53 with
flags = 0x4)

* Build & load kernel with bootverbose

Actual result: only part of nvram variables are found
Expected result: all variables are found

Submitted by:	Michael Zhilin <mizhka@gmail.com>
Differential Revision:	https://reviews.freebsd.org/D6466
This commit is contained in:
Adrian Chadd 2016-05-23 03:51:15 +00:00
parent 9d292ea16d
commit 2e79170e4f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=300446
1 changed files with 55 additions and 49 deletions
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104
sys/dev/nvram2env/nvram2env.c
View File

@ -193,10 +193,12 @@ static uint32_t read_4(struct nvram2env_softc * sc, int offset)
static int
nvram2env_attach(device_t dev)
{
struct nvram2env_softc * sc = device_get_softc(dev);
struct nvram * nv;
struct nvram2env_softc *sc;
struct nvram *nv;
char *pair, *value, *assign;
uint32_t sig, size, i;
uint32_t sig, size, i, *tmp;
sc = device_get_softc(dev);
if (sc->bst == 0 || sc->addr == 0)
return (ENXIO);
@ -217,16 +219,22 @@ nvram2env_attach(device_t dev)
if (sig == sc->sig || (sc->flags & NVRAM_FLAGS_UBOOT))
{
/* align and shift size to 32bit size*/
/* align size to 32bit size*/
size += 3;
size >>= 2;
size &= ~3;
nv = malloc(size<<2, M_DEVBUF, M_WAITOK | M_ZERO);
nv = malloc(size, M_DEVBUF, M_WAITOK | M_ZERO);
if (!nv)
return (ENOMEM);
/* set tmp pointer to begin of NVRAM */
tmp = (uint32_t *) nv;
for (i = 0; i < size; i ++)
((uint32_t *)nv)[i] = read_4(sc, i<<2);
/* use read_4 to swap bytes if it's required */
for (i = 0; i < size; i += 4) {
*tmp = read_4(sc, i);
tmp++;
}
/* now tmp pointer is end of NVRAM */
if (sc->flags & NVRAM_FLAGS_BROADCOM) {
device_printf(dev, "sig = %#x\n", nv->sig);
@ -246,49 +254,47 @@ nvram2env_attach(device_t dev)
else
pair = (char*)nv+4;
for ( ;
(u_int32_t)pair < ((u_int32_t)nv + size - 4);
pair = pair + strlen(pair) + 1 + strlen(value) + 1 ) {
/* iterate over buffer till end. tmp points to end of NVRAM */
for ( ; pair < (char*)tmp;
pair += strlen(pair) + strlen(value) + 2 ) {
if (pair && strlen(pair)) {
#if 0
printf("ENV: %s\n", pair);
#endif
/* hint.nvram.0. */
assign = strchr(pair,'=');
assign[0] = '\0';
value = assign+1;
#if 1
if (bootverbose)
printf("ENV: %s=%s\n", pair, value);
#endif
kern_setenv(pair, value);
if (strcasecmp(pair, "WAN_MAC_ADDR") == 0) {
/* Alias for MAC address of eth0 */
if (bootverbose)
printf("ENV: aliasing "
"WAN_MAC_ADDR to ethaddr"
" = %s\n", value);
kern_setenv("ethaddr", value);
}
else if (strcasecmp(pair, "LAN_MAC_ADDR") == 0){
/* Alias for MAC address of eth1 */
if (bootverbose)
printf("ENV: aliasing "
"LAN_MAC_ADDR to eth1addr"
" = %s\n", value);
kern_setenv("eth1addr", value);
}
if (strcmp(pair, "bootverbose") == 0)
bootverbose = strtoul(value, 0, 0);
if (strcmp(pair, "boothowto" ) == 0)
boothowto = strtoul(value, 0, 0);
}
else
if (!pair || (strlen(pair) == 0))
break;
/* hint.nvram.0. */
assign = strchr(pair,'=');
assign[0] = '\0';
value = assign+1;
#if 1
if (bootverbose)
printf("ENV: %s=%s\n", pair, value);
#else
printf("ENV: %s\n", pair);
#endif
kern_setenv(pair, value);
if (strcasecmp(pair, "WAN_MAC_ADDR") == 0) {
/* Alias for MAC address of eth0 */
if (bootverbose)
printf("ENV: aliasing "
"WAN_MAC_ADDR to ethaddr"
" = %s\n", value);
kern_setenv("ethaddr", value);
}
else if (strcasecmp(pair, "LAN_MAC_ADDR") == 0){
/* Alias for MAC address of eth1 */
if (bootverbose)
printf("ENV: aliasing "
"LAN_MAC_ADDR to eth1addr"
" = %s\n", value);
kern_setenv("eth1addr", value);
}
if (strcmp(pair, "bootverbose") == 0)
bootverbose = strtoul(value, 0, 0);
if (strcmp(pair, "boothowto" ) == 0)
boothowto = strtoul(value, 0, 0);
}
free(nv, M_DEVBUF);
}