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if_emac: Before generating a random MAC address, try using the SID rootkey

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to generate one. This is was U-Boot does to generate a random MAC so we end
up with the same MAC address as if U-Boot did generate it.

MFC after:	1 week
This commit is contained in:
manu 2016-08-19 23:44:07 +00:00
parent 93da7f569e
commit 4bb61676bd
1 changed files with 23 additions and 7 deletions
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30
sys/arm/allwinner/if_emac.c
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@ -77,6 +77,7 @@ __FBSDID("$FreeBSD$");
#include <dev/mii/miivar.h>
#include <arm/allwinner/if_emacreg.h>
#include <arm/allwinner/aw_sid.h>
#include <dev/extres/clk/clk.h>
@ -167,12 +168,17 @@ static void
emac_get_hwaddr(struct emac_softc *sc, uint8_t *hwaddr)
{
uint32_t val0, val1, rnd;
u_char rootkey[16];
/*
* Try to get MAC address from running hardware.
* If there is something non-zero there just use it.
*
* Otherwise set the address to a convenient locally assigned address,
* using the SID rootkey.
* This is was uboot does so we end up with the same mac as if uboot
* did set it.
* If we can't get the root key, generate a random one,
* 'bsd' + random 24 low-order bits. 'b' is 0x62, which has the locally
* assigned bit set, and the broadcast/multicast bit clear.
*/
@ -186,13 +192,23 @@ emac_get_hwaddr(struct emac_softc *sc, uint8_t *hwaddr)
hwaddr[4] = (val0 >> 8) & 0xff;
hwaddr[5] = (val0 >> 0) & 0xff;
} else {
rnd = arc4random() & 0x00ffffff;
hwaddr[0] = 'b';
hwaddr[1] = 's';
hwaddr[2] = 'd';
hwaddr[3] = (rnd >> 16) & 0xff;
hwaddr[4] = (rnd >> 8) & 0xff;
hwaddr[5] = (rnd >> 0) & 0xff;
if (aw_sid_get_rootkey(rootkey) == 0) {
hwaddr[0] = 0x2;
hwaddr[1] = rootkey[3];
hwaddr[2] = rootkey[12];
hwaddr[3] = rootkey[13];
hwaddr[4] = rootkey[14];
hwaddr[5] = rootkey[15];
}
else {
rnd = arc4random() & 0x00ffffff;
hwaddr[0] = 'b';
hwaddr[1] = 's';
hwaddr[2] = 'd';
hwaddr[3] = (rnd >> 16) & 0xff;
hwaddr[4] = (rnd >> 8) & 0xff;
hwaddr[5] = (rnd >> 0) & 0xff;
}
}
if (bootverbose)
printf("MAC address: %s\n", ether_sprintf(hwaddr));