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hw/arm/nseries: convert ffs(3) to ctz32()

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It is not clear from the code how a 0 parameter should be handled by the
hardware.  Keep the same behavior as ffs(0) - 1 == -1.

Cc: Andrzej Zaborowski <balrog@zabor.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427124571-28598-3-git-send-email-stefanha@redhat.com
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2015-03-23 15:29:24 +00:00 committed by Kevin Wolf
parent 588ef9d411
commit ad5f5fdca8
1 changed files with 4 additions and 1 deletions
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hw/arm/nseries.c
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@ -579,7 +579,10 @@ static uint32_t mipid_txrx(void *opaque, uint32_t cmd, int len)
case 0x26: /* GAMSET */
if (!s->pm) {
s->gamma = ffs(s->param[0] & 0xf) - 1;
s->gamma = ctz32(s->param[0] & 0xf);
if (s->gamma == 32) {
s->gamma = -1; /* XXX: should this be 0? */
}
} else if (s->pm < 0) {
s->pm = 1;
}