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Tip revision: 33d930e59a98fa10a0db9f56c7fa2f21a4aef9b9 authored by Linus Torvalds on 16 October 2017, 01:01:12 UTC
Linux 4.14-rc5
Linux 4.14-rc5
Tip revision: 33d930e
delay-loop.S
/*
* linux/arch/arm/lib/delay.S
*
* Copyright (C) 1995, 1996 Russell King
*
* 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/linkage.h>
#include <asm/assembler.h>
#include <asm/delay.h>
.text
.LC0: .word loops_per_jiffy
.LC1: .word UDELAY_MULT
/*
* loops = r0 * HZ * loops_per_jiffy / 1000000
*
* r0 <= 2000
* HZ <= 1000
*/
ENTRY(__loop_udelay)
ldr r2, .LC1
mul r0, r2, r0 @ r0 = delay_us * UDELAY_MULT
ENTRY(__loop_const_udelay) @ 0 <= r0 <= 0xfffffaf0
ldr r2, .LC0
ldr r2, [r2]
umull r1, r0, r2, r0 @ r0-r1 = r0 * loops_per_jiffy
adds r1, r1, #0xffffffff @ rounding up ...
adcs r0, r0, r0 @ and right shift by 31
reteq lr
.align 3
@ Delay routine
ENTRY(__loop_delay)
subs r0, r0, #1
#if 0
retls lr
subs r0, r0, #1
retls lr
subs r0, r0, #1
retls lr
subs r0, r0, #1
retls lr
subs r0, r0, #1
retls lr
subs r0, r0, #1
retls lr
subs r0, r0, #1
retls lr
subs r0, r0, #1
#endif
bhi __loop_delay
ret lr
ENDPROC(__loop_udelay)
ENDPROC(__loop_const_udelay)
ENDPROC(__loop_delay)