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Diffstat (limited to 'arch/mips/bcm47xx/nvram.c')
-rw-r--r--arch/mips/bcm47xx/nvram.c60
1 files changed, 45 insertions, 15 deletions
diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
index 95d028ca6f8a..2ed762ed4006 100644
--- a/arch/mips/bcm47xx/nvram.c
+++ b/arch/mips/bcm47xx/nvram.c
@@ -94,17 +94,22 @@ static int nvram_find_and_copy(void __iomem *iobase, u32 lim)
return -ENXIO;
found:
- if (header->len > size)
- pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
- if (header->len > NVRAM_SPACE)
- pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
- header->len, NVRAM_SPACE - 1);
-
src = (u32 *)header;
dst = (u32 *)nvram_buf;
for (i = 0; i < sizeof(struct nvram_header); i += 4)
*dst++ = __raw_readl(src++);
- for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4)
+ header = (struct nvram_header *)nvram_buf;
+ if (header->len > size) {
+ pr_err("The nvram size according to the header seems to be bigger than the partition on flash\n");
+ header->len = size;
+ }
+ if (header->len >= NVRAM_SPACE) {
+ pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
+ header->len, NVRAM_SPACE - 1);
+ header->len = NVRAM_SPACE - 1;
+ }
+ /* proceed reading data after header */
+ for (; i < header->len; i += 4)
*dst++ = readl(src++);
nvram_buf[NVRAM_SPACE - 1] = '\0';
@@ -139,6 +144,7 @@ static int nvram_init(void)
#ifdef CONFIG_MTD
struct mtd_info *mtd;
struct nvram_header header;
+ struct nvram_header *pheader;
size_t bytes_read;
int err;
@@ -147,20 +153,21 @@ static int nvram_init(void)
return -ENODEV;
err = mtd_read(mtd, 0, sizeof(header), &bytes_read, (uint8_t *)&header);
- if (!err && header.magic == NVRAM_MAGIC) {
- u8 *dst = (uint8_t *)nvram_buf;
- size_t len = header.len;
-
- if (len >= NVRAM_SPACE) {
- len = NVRAM_SPACE - 1;
+ if (!err && header.magic == NVRAM_MAGIC &&
+ header.len > sizeof(header)) {
+ if (header.len >= NVRAM_SPACE) {
pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
- header.len, len);
+ header.len, NVRAM_SPACE);
+ header.len = NVRAM_SPACE - 1;
}
- err = mtd_read(mtd, 0, len, &bytes_read, dst);
+ err = mtd_read(mtd, 0, header.len, &bytes_read,
+ (u8 *)nvram_buf);
if (err)
return err;
+ pheader = (struct nvram_header *)nvram_buf;
+ pheader->len = header.len;
return 0;
}
#endif
@@ -219,3 +226,26 @@ int bcm47xx_nvram_gpio_pin(const char *name)
return -ENOENT;
}
EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);
+
+char *bcm47xx_nvram_get_contents(size_t *nvram_size)
+{
+ int err;
+ char *nvram;
+ struct nvram_header *header;
+
+ if (!nvram_buf[0]) {
+ err = nvram_init();
+ if (err)
+ return NULL;
+ }
+
+ header = (struct nvram_header *)nvram_buf;
+ *nvram_size = header->len - sizeof(struct nvram_header);
+ nvram = vmalloc(*nvram_size);
+ if (!nvram)
+ return NULL;
+ memcpy(nvram, &nvram_buf[sizeof(struct nvram_header)], *nvram_size);
+
+ return nvram;
+}
+EXPORT_SYMBOL(bcm47xx_nvram_get_contents);