arch/arm/lib/io-writesw-armv3.S

   1 /*
   2  *  linux/arch/arm/lib/io-writesw-armv3.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 .outsw_bad_alignment:
  15                 adr     r0, .outsw_bad_align_msg
  16                 mov     r2, lr
  17                 b       panic
  18 .outsw_bad_align_msg:
  19                 .asciz  "outsw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
  20                 .align
  21
  22 .outsw_align:   tst     r1, #1
  23                 bne     .outsw_bad_alignment
  24
  25                 add     r1, r1, #2
  26
  27                 ldr     r3, [r1, #-4]
  28                 mov     r3, r3, lsr #16
  29                 orr     r3, r3, r3, lsl #16
  30                 str     r3, [r0]
  31                 subs    r2, r2, #1
  32                 RETINSTR(moveq, pc, lr)
  33
  34 ENTRY(__raw_writesw)
  35                 teq     r2, #0          @ do we have to check for the zero len?
  36                 moveq   pc, lr
  37                 tst     r1, #3
  38                 bne     .outsw_align
  39
  40 .outsw_aligned: stmfd   sp!, {r4, r5, r6, lr}
  41
  42                 subs    r2, r2, #8
  43                 bmi     .no_outsw_8
  44
  45 .outsw_8_lp:    ldmia   r1!, {r3, r4, r5, r6}
  46
  47                 mov     ip, r3, lsl #16
  48                 orr     ip, ip, ip, lsr #16
  49                 str     ip, [r0]
  50
  51                 mov     ip, r3, lsr #16
  52                 orr     ip, ip, ip, lsl #16
  53                 str     ip, [r0]
  54
  55                 mov     ip, r4, lsl #16
  56                 orr     ip, ip, ip, lsr #16
  57                 str     ip, [r0]
  58
  59                 mov     ip, r4, lsr #16
  60                 orr     ip, ip, ip, lsl #16
  61                 str     ip, [r0]
  62
  63                 mov     ip, r5, lsl #16
  64                 orr     ip, ip, ip, lsr #16
  65                 str     ip, [r0]
  66
  67                 mov     ip, r5, lsr #16
  68                 orr     ip, ip, ip, lsl #16
  69                 str     ip, [r0]
  70
  71                 mov     ip, r6, lsl #16
  72                 orr     ip, ip, ip, lsr #16
  73                 str     ip, [r0]
  74
  75                 mov     ip, r6, lsr #16
  76                 orr     ip, ip, ip, lsl #16
  77                 str     ip, [r0]
  78
  79                 subs    r2, r2, #8
  80                 bpl     .outsw_8_lp
  81
  82                 tst     r2, #7
  83                 LOADREGS(eqfd, sp!, {r4, r5, r6, pc})
  84
  85 .no_outsw_8:    tst     r2, #4
  86                 beq     .no_outsw_4
  87
  88                 ldmia   r1!, {r3, r4}
  89
  90                 mov     ip, r3, lsl #16
  91                 orr     ip, ip, ip, lsr #16
  92                 str     ip, [r0]
  93
  94                 mov     ip, r3, lsr #16
  95                 orr     ip, ip, ip, lsl #16
  96                 str     ip, [r0]
  97
  98                 mov     ip, r4, lsl #16
  99                 orr     ip, ip, ip, lsr #16
 100                 str     ip, [r0]
 101
 102                 mov     ip, r4, lsr #16
 103                 orr     ip, ip, ip, lsl #16
 104                 str     ip, [r0]
 105
 106 .no_outsw_4:    tst     r2, #2
 107                 beq     .no_outsw_2
 108
 109                 ldr     r3, [r1], #4
 110
 111                 mov     ip, r3, lsl #16
 112                 orr     ip, ip, ip, lsr #16
 113                 str     ip, [r0]
 114
 115                 mov     ip, r3, lsr #16
 116                 orr     ip, ip, ip, lsl #16
 117                 str     ip, [r0]
 118
 119 .no_outsw_2:    tst     r2, #1
 120
 121                 ldrne   r3, [r1]
 122
 123                 movne   ip, r3, lsl #16
 124                 orrne   ip, ip, ip, lsr #16
 125                 strne   ip, [r0]
 126
 127                 LOADREGS(fd, sp!, {r4, r5, r6, pc})