d6bb7a1ad3
gcc 4.2.1 for MN10300 is more agressive than the older gcc in reordering/moving other insns between an insn that sets flags and an insn that uses those flags. This leads to trouble with asm statements which are missing an explicit "cc" clobber. This patch adds the explicit "cc" clobber to asm statements which do indeed clobber the condition flags. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/* MN10300 Short delay interpolation routines
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <asm/div64.h>
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/*
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* basic delay loop
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*/
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void __delay(unsigned long loops)
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{
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int d0;
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asm volatile(
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" bra 1f \n"
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" .align 4 \n"
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"1: bra 2f \n"
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" .align 4 \n"
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"2: add -1,%0 \n"
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" bne 2b \n"
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: "=&d" (d0)
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: "0" (loops)
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: "cc");
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}
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EXPORT_SYMBOL(__delay);
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/*
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* handle a delay specified in terms of microseconds
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*/
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void __udelay(unsigned long usecs)
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{
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signed long ioclk, stop;
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/* usecs * CLK / 1E6 */
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stop = __muldiv64u(usecs, MN10300_TSCCLK, 1000000);
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stop = TMTSCBC - stop;
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do {
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ioclk = TMTSCBC;
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} while (stop < ioclk);
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}
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EXPORT_SYMBOL(__udelay);
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