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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768/* SPDX-License-Identifier: GPL-2.0-only *//* * linux/arch/arm/lib/delay.S * * Copyright (C) 1995, 1996 Russell King */#include <linux/linkage.h>#include <linux/cfi_types.h>#include <asm/assembler.h>#include <asm/delay.h>
#ifdef CONFIG_ARCH_RPC .arch armv4#endif
.text
.LC0: .word loops_per_jiffy.LC1: .word UDELAY_MULT
/* * loops = r0 * HZ * loops_per_jiffy / 1000000 * * r0 <= 2000 * HZ <= 1000 */
SYM_TYPED_FUNC_START(__loop_udelay) ldr r2, .LC1 mul r0, r2, r0 @ r0 = delay_us * UDELAY_MULT b __loop_const_udelaySYM_FUNC_END(__loop_udelay)
SYM_TYPED_FUNC_START(__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 b __loop_delaySYM_FUNC_END(__loop_const_udelay)
.align 3
@ Delay routineSYM_TYPED_FUNC_START(__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 lrSYM_FUNC_END(__loop_delay)