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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright 2019 Broadcom Ltd.
*/
#include <common.h>
#include <linux/ctype.h>
#include <environment.h>
#include <hexdump.h>
#include <stdlib.h>
#include <string.h>
#include "bca_common.h"
#include "spl_env.h"
/**
* find_spl_env_val - get pointer to named environment value
* @buffer: pointer to the magic number of the, already loaded and validated, environment buffer
* @name: name of the environment variable to find
*
* returns:
* pointer to the first character after the NAME= string in the environment if found
* NULL if not found
*/
char *find_spl_env_val(const char *buffer, const char *name)
{
uint32_t len;
env_t *ep;
int nmlen;
uint32_t *d = (uint32_t *) buffer;
if (buffer == NULL) {
return NULL;
}
len = d[1];
nmlen = strlen(name);
#if BCM_DEBUG_SPLENV
printf("look for env %s\n", name);
#endif /* BCM_DEBUG_SPLENV */
ep = (env_t *) (buffer + 8);
char *c;
char previous = '\0';
c = (char *)&ep->data[0];
while ((c < (char *)&ep->data[len - 4])
&& ((c[0] != '\0') || (c[1] != '\0'))) {
if ((previous == '\0')
&& (0 == strncmp(name, (char *)c, nmlen))
&& (c[nmlen] == '=')) {
c = c + nmlen + 1;
#if BCM_DEBUG_SPLENV
{
int i;
i = strlen(c);
if (i > 80) {
printf("found %d byte value\n",i);
} else {
printf("found %s\n", c);
}
}
#endif /* BCM_DEBUG_SPLENV */
return c;
}
previous = c[0];
c++;
}
return NULL;
}
/**
* get_spl_env_val - get named environment value
* @buffer: pointer to the magic number of the, already loaded and validated, environment buffer
* @name: name of the environment variable to find
* @out: pointer to buffer to which data will be copied
* @maxlen: max bytes to copy to the output buffer
*
* returns:
* 0 if successful
* 1 if not found
*/
int get_spl_env_val(const char *buffer, const char *name, char *out, int maxlen)
{
char *c;
c = find_spl_env_val(buffer, name);
if (NULL != c) {
strncpy(out, c, maxlen);
return (0);
}
return 1;
}
int validate_metadata(char *cp, int *valid, int *committed, int *seq)
{
uint32_t *d, crc, got;
env_t *ep;
char buf[16];
d = (uint32_t *) cp;
ep = (env_t *) & d[2];
memcpy(&crc, &ep->crc, sizeof(crc));
got = crc32(0, ep->data, (d[1] - 4) & 0xffff);
if (got == crc) {
unsigned long iargs[3];
int n, i;
n = parse_env_nums(find_spl_env_val
(cp, "VALID"), 3, iargs, NULL);
for (i = 0; i < n; i++) {
if ((iargs[i] >= 1) && (iargs[i] <= 2)) {
valid[iargs[i] - 1] = iargs[i];
}
}
if (0 == get_spl_env_val(cp, "COMMITTED", buf, 10)) {
*committed = (buf[0] == '1') ? 1 : 2;
}
// preset the sequence numbers incase the field doesn't exist
if ((*committed == 1) && valid[0])
{
seq[0] = 1;
if (valid[1])
seq[1] = 0;
}
else if ((*committed == 2) && valid[1])
{
seq[1] = 1;
if (valid[0])
seq[0] = 0;
}
n = parse_env_nums(find_spl_env_val
(cp, "SEQ"), 3, iargs, NULL);
for (i = 0; i < n; i++) {
seq[i] = iargs[i];
}
return (0);
}
#if 0
printf("at %p for %d bytes expected %x got %x\n",&ep->data, d[0]-4, crc,got);
print_hex_dump_bytes("vdate: ", DUMP_PREFIX_ADDRESS, cp, 256+32);
got = crc32(0, ep->data, (d[0] - 4) & 0xffff);
printf("just for grins %x\n",got);
#endif
/* Error out all fields to indicate no committed and valid images */
valid[0] = 0;
valid[1] = 0;
*committed = 0;
seq[0] = -1;
seq[1] = -1;
return (1);
}
/* UBOOT has multiple conflicting CRC32 implementations, so share the one that works */
uint32_t the_env_crc32(int a, void *b, int len) {
return(crc32(a,b,len));
}
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