Release 4.7 arch/x86/um/delay.c

/*
 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
 * Mostly copied from arch/x86/lib/delay.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <asm/param.h>



void __delay(unsigned long loops)
{
	asm volatile(
                "test %0,%0\n"
                "jz 3f\n"
                "jmp 1f\n"

                ".align 16\n"
                "1: jmp 2f\n"

                ".align 16\n"
                "2: dec %0\n"
                " jnz 2b\n"
                "3: dec %0\n"

                : /* we don't need output */
		: "a" (loops)
        );
}
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jeff dike
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richard weinberger
richard weinberger
6
42.86%
1
50.00%
Total
14
100.00%
2
100.00%


EXPORT_SYMBOL(__delay);



inline void __const_udelay(unsigned long xloops)
{
	int d0;

	xloops *= 4;
	asm("mull %%edx"
                : "=d" (xloops), "=&a" (d0)
                : "1" (xloops), "0"
                (loops_per_jiffy * (HZ/4)));

	__delay(++xloops);
}
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richard weinberger
richard weinberger
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jeff dike
jeff dike
6
25.00%
2
66.67%
Total
24
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3
100.00%


EXPORT_SYMBOL(__const_udelay);



void __udelay(unsigned long usecs)
{
	__const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
}
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bodo stroesser
bodo stroesser
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richard weinberger
richard weinberger
6
35.29%
1
33.33%
jeff dike
jeff dike
1
5.88%
1
33.33%
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17
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3
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EXPORT_SYMBOL(__udelay);



void __ndelay(unsigned long nsecs)
{
	__const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
}
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EXPORT_SYMBOL(__ndelay);
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richard weinberger
richard weinberger
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1
25.00%
jeff dike
jeff dike
26
24.76%
2
50.00%
bodo stroesser
bodo stroesser
14
13.33%
1
25.00%
Total
105
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4
100.00%
  
Directory: arch/x86/um

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