/* Free all tuples. Should be locked. */
static void
BCMINITFN(nvram_free)(void)
{
uint i;
struct nvram_tuple *t, *next;
/* Free hash table */
for (i = 0; i < ARRAYSIZE(nvram_hash); i++) {
for (t = nvram_hash[i]; t; t = next) {
next = t->next;
_nvram_free(t);
}
nvram_hash[i] = NULL;
}
/* Free dead table */
for (t = nvram_dead; t; t = next) {
next = t->next;
_nvram_free(t);
}
nvram_dead = NULL;
/* Indicate to per-port code that all tuples have been freed */
_nvram_free(NULL);
}
/* (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);
}
/* 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;
}
/* (Re)initialize the hash table. */
static int _nvram_rehash(nvram_handle_t *h)
{
/* (Re)initialize hash table */
_nvram_free(h);
/* Parse and set "name=value\0 ... \0\0" */
char *name = (char *) &header[1];
for (; *name; name = value + strlen(value) + 1) {
if (!(eq = strchr(name, '=')))
break;
*eq = '\0';
value = eq + 1;
hash_nvram_set(h, name, value);
*eq = '=';
}
return 0;
}
/* (Re)initialize the hash table. */
static int _nvram_rehash(nvram_handle_t *h)
{
nvram_header_t *header =(nvram_header_t *) &h->mmap[0];
char *name, *value, *eq;
_nvram_free(h);
name = (char *) &header[1];
for (; *name; name = value + strlen(value) + 1)
{
if (!(eq = strchr(name, '='))) //。第一个形参就是要搜索的字符串，第二个是被搜索的字符。
//如果找到了该字符就返回该字符第一次出现的内存地址。如果没有找到就返回NULL（也就是0）。
break;
*eq = '\0';
value = eq + 1;
_nvram_set(h, name, value);
*eq = '=';
}
return 0;
}
int hash_nvram_close(nvram_handle_t *h)
{
_nvram_free(h);
return 0;
}
