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sys/luid: allow to overwrite luid_base()

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This allows to overwrite luid_base() with a function that reads an
ID from e.g. a EUI64MAC chip if no CPU ID is available.
This commit is contained in:
Benjamin Valentin 2019-11-04 21:07:23 +01:00
parent 9fb01b6d1c
commit f6e7be9a06
1 changed files with 20 additions and 17 deletions
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37
sys/luid/luid.c
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@ -26,7 +26,26 @@
#include "luid.h"
static uint8_t lastused = 1;
#ifndef MAX
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#endif
void __attribute__((weak)) luid_base(void *buf, size_t len)
{
memset(buf, LUID_BACKUP_SEED, len);
#if CPUID_LEN
uint8_t *out = (uint8_t *)buf;
uint8_t cid[CPUID_LEN];
cpuid_get(cid);
for (size_t i = 0; i < MAX(len, CPUID_LEN); i++) {
out[i % len] ^= cid[i % CPUID_LEN];
}
#endif
}
static uint8_t lastused;
void luid_get(void *buf, size_t len)
{
@ -44,19 +63,3 @@ void luid_custom(void *buf, size_t len, int gen)
}
}
void luid_base(void *buf, size_t len)
{
assert(buf && (len > 0));
memset(buf, LUID_BACKUP_SEED, len);
#if CPUID_LEN
uint8_t *out = (uint8_t *)buf;
uint8_t cid[CPUID_LEN];
cpuid_get(cid);
for (size_t i = 0; i < CPUID_LEN; i++) {
out[i % len] ^= cid[i];
}
#endif
}