diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-blackfin/net.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/asm-blackfin/net.h b/include/asm-blackfin/net.h new file mode 100644 index 0000000000..97cb46691e --- /dev/null +++ b/include/asm-blackfin/net.h @@ -0,0 +1,28 @@ +/* + * net.h - misc Blackfin network helpers + * + * Copyright (c) 2008-2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#ifndef __ASM_BFIN_RAND_MAC__ +#define __ASM_BFIN_RAND_MAC__ + +/* If the board does not have a real MAC assigned to it, then generate a + * locally administrated pseudo-random one based on CYCLES and compile date. + */ +static inline void bfin_gen_rand_mac(uchar *mac_addr) +{ + /* make something up */ + const char s[] = __DATE__; + size_t i; + u32 cycles; + for (i = 0; i < 6; ++i) { + asm("%0 = CYCLES;" : "=r" (cycles)); + mac_addr[i] = cycles ^ s[i]; + } + mac_addr[0] = (mac_addr[0] | 0x02) & ~0x01; /* make it local unicast */ +} + +#endif |