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[SPARC64]: Define ARCH_HAS_READ_CURRENT_TIMER.

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This gives more consistent bogomips and delay() semantics,
especially on sun4v.  It gives weird looking values though...

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-02-17 12:33:13 -08:00
parent 3f19a84e39
commit 3763be32d5
3 changed files with 15 additions and 18 deletions
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19
arch/sparc64/lib/delay.c
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@ -1,6 +1,6 @@
/* delay.c: Delay loops for sparc64
*
* Copyright (C) 2004 David S. Miller <davem@redhat.com>
* Copyright (C) 2004, 2006 David S. Miller <davem@davemloft.net>
*
* Based heavily upon x86 variant which is:
* Copyright (C) 1993 Linus Torvalds
@ -8,19 +8,16 @@
*/
#include <linux/delay.h>
#include <asm/timer.h>
void __delay(unsigned long loops)
{
__asm__ __volatile__(
" b,pt %%xcc, 1f\n"
" cmp %0, 0\n"
" .align 32\n"
"1:\n"
" bne,pt %%xcc, 1b\n"
" subcc %0, 1, %0\n"
: "=&r" (loops)
: "0" (loops)
: "cc");
unsigned long bclock, now;
bclock = tick_ops->get_tick();
do {
now = tick_ops->get_tick();
} while ((now-bclock) < loops);
}
/* We used to multiply by HZ after shifting down by 32 bits