~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/arm/lib/delay-loop.S

Version: ~ [ linux-6.11-rc3 ] ~ [ linux-6.10.4 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.45 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.104 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.164 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.223 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.281 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.319 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  *  linux/arch/arm/lib/delay.S
  4  *
  5  *  Copyright (C) 1995, 1996 Russell King
  6  */
  7 #include <linux/linkage.h>
  8 #include <linux/cfi_types.h>
  9 #include <asm/assembler.h>
 10 #include <asm/delay.h>
 11 
 12 #ifdef CONFIG_ARCH_RPC
 13                 .arch   armv4
 14 #endif
 15 
 16                 .text
 17 
 18 .LC0:           .word   loops_per_jiffy
 19 .LC1:           .word   UDELAY_MULT
 20 
 21 /*
 22  * loops = r0 * HZ * loops_per_jiffy / 1000000
 23  *
 24  * r0  <= 2000
 25  * HZ  <= 1000
 26  */
 27 
 28 SYM_TYPED_FUNC_START(__loop_udelay)
 29                 ldr     r2, .LC1
 30                 mul     r0, r2, r0              @ r0 = delay_us * UDELAY_MULT
 31                 b       __loop_const_udelay
 32 SYM_FUNC_END(__loop_udelay)
 33 
 34 SYM_TYPED_FUNC_START(__loop_const_udelay)       @ 0 <= r0 <= 0xfffffaf0
 35                 ldr     r2, .LC0
 36                 ldr     r2, [r2]
 37                 umull   r1, r0, r2, r0          @ r0-r1 = r0 * loops_per_jiffy
 38                 adds    r1, r1, #0xffffffff     @ rounding up ...
 39                 adcs    r0, r0, r0              @ and right shift by 31
 40                 reteq   lr
 41                 b       __loop_delay
 42 SYM_FUNC_END(__loop_const_udelay)
 43 
 44                 .align 3
 45 
 46 @ Delay routine
 47 SYM_TYPED_FUNC_START(__loop_delay)
 48                 subs    r0, r0, #1
 49 #if 0
 50                 retls   lr
 51                 subs    r0, r0, #1
 52                 retls   lr
 53                 subs    r0, r0, #1
 54                 retls   lr
 55                 subs    r0, r0, #1
 56                 retls   lr
 57                 subs    r0, r0, #1
 58                 retls   lr
 59                 subs    r0, r0, #1
 60                 retls   lr
 61                 subs    r0, r0, #1
 62                 retls   lr
 63                 subs    r0, r0, #1
 64 #endif
 65                 bhi     __loop_delay
 66                 ret     lr
 67 SYM_FUNC_END(__loop_delay)

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

sflogo.php