arch/arm/lib/setbit.S

   1 /*
   2  *  linux/arch/arm/lib/setbit.S
   3  *
   4  *  Copyright (C) 1995-1996 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/linkage.h>
  11 #include <asm/assembler.h>
  12                 .text
  13
  14 /*
  15  * Purpose  : Function to set a bit
  16  * Prototype: int set_bit(int bit, void *addr)
  17  */
  18 ENTRY(_set_bit_be)
  19                 eor     r0, r0, #0x18           @ big endian byte ordering
  20 ENTRY(_set_bit_le)
  21                 and     r2, r0, #7
  22                 mov     r3, #1
  23                 mov     r3, r3, lsl r2
  24                 save_and_disable_irqs ip, r2
  25                 ldrb    r2, [r1, r0, lsr #3]
  26                 orr     r2, r2, r3
  27                 strb    r2, [r1, r0, lsr #3]
  28                 restore_irqs ip
  29                 RETINSTR(mov,pc,lr)