kernel/linux/arch/arm26/lib/io-writesl.S

   1 /*
   2  *  linux/arch/arm/lib/io-writesl.S
   3  *
   4  *  Copyright (C) 1995-2000 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 #include <asm/hardware.h>
  13
  14 ENTRY(__raw_writesl)
  15                 teq     r2, #0          @ do we have to check for the zero len?
  16                 moveq   pc, lr
  17                 ands    ip, r1, #3
  18                 bne     2f
  19
  20 1:              ldr     r3, [r1], #4
  21                 str     r3, [r0]
  22                 subs    r2, r2, #1
  23                 bne     1b
  24                 mov     pc, lr
  25
  26 2:              bic     r1, r1, #3
  27                 cmp     ip, #2
  28                 ldr     r3, [r1], #4
  29                 bgt     4f
  30                 blt     5f
  31
  32 3:              mov     ip, r3, lsr #16
  33                 ldr     r3, [r1], #4
  34                 orr     ip, ip, r3, lsl #16
  35                 str     ip, [r0]
  36                 subs    r2, r2, #1
  37                 bne     3b
  38                 mov     pc, lr
  39
  40 4:              mov     ip, r3, lsr #24
  41                 ldr     r3, [r1], #4
  42                 orr     ip, ip, r3, lsl #8
  43                 str     ip, [r0]
  44                 subs    r2, r2, #1
  45                 bne     4b
  46                 mov     pc, lr
  47
  48 5:              mov     ip, r3, lsr #8
  49                 ldr     r3, [r1], #4
  50                 orr     ip, ip, r3, lsl #24
  51                 str     ip, [r0]
  52                 subs    r2, r2, #1
  53                 bne     5b
  54                 mov     pc, lr
  55
  56