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usbxhci: simplify xecp()

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This commit is contained in:
cinap_lenrek 2017-07-29 01:12:32 +02:00
parent c74538a67e
commit cd108e2f0b
1 changed files with 12 additions and 14 deletions
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26
sys/src/9/pc/usbxhci.c
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@ -317,22 +317,20 @@ xecp(Ctlr *ctlr, uchar id, u32int *p)
{
u32int x;
if(p != nil) {
x = *p;
goto Next;
}
x = ctlr->hccparams>>16;
if(x == 0)
return nil;
p = ctlr->mmio + x;
while(((x = *p) & 255) != id){
Next:
x >>= 8, x &= 255;
if(x == 0)
return nil;
if(p == nil){
p = ctlr->mmio;
x = ctlr->hccparams>>16;
} else
x = (*p>>8) & 255;
while(x != 0){
p += x;
x = *p;
if((x & 255) == id)
return p;
x >>= 8;
x &= 255;
}
return p;
return nil;
}
static void