| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364 |
- /*
- * 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
- /*
- * r0 <= 2000
- * HZ <= 1000
- */
- ENTRY(__loop_udelay)
- ldr r2, .LC1
- mul r0, r2, r0
- ENTRY(__loop_const_udelay) @ 0 <= r0 <= 0x7fffff06
- ldr r2, .LC0
- ldr r2, [r2]
- umull r1, r0, r2, r0
- adds r1, r1, #0xffffffff
- adcs r0, r0, r0
- reteq lr
- /*
- * loops = r0 * HZ * loops_per_jiffy / 1000000
- */
- .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)
|
