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uninorth: 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: Alexander Graf <agraf@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427124571-28598-4-git-send-email-stefanha@redhat.com
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2015-03-23 15:29:25 +00:00 committed by Kevin Wolf
parent ad5f5fdca8
commit 5863d374a3
1 changed files with 4 additions and 1 deletions
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5
hw/pci-host/uninorth.c
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@ -92,7 +92,10 @@ static uint32_t unin_get_config_reg(uint32_t reg, uint32_t addr)
uint32_t slot, func;
/* Grab CFA0 style values */
slot = ffs(reg & 0xfffff800) - 1;
slot = ctz32(reg & 0xfffff800);
if (slot == 32) {
slot = -1; /* XXX: should this be 0? */
}
func = (reg >> 8) & 7;
/* ... and then convert them to x86 format */