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   1 /*
   2  *  linux/arch/arm/lib/copypage.S
   3  *
   4  *  Copyright (C) 1995-1999 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  *  ASM optimised string functions
  11  */
  12 #include <linux/linkage.h>
  13 #include <linux/init.h>
  14 #include <asm/assembler.h>
  15 #include <asm/asm-offsets.h>
  16
  17                 .text
  18                 .align  5
  19 /*
  20  * ARMv3 optimised copy_user_page
  21  *
  22  * FIXME: do we need to handle cache stuff...
  23  */
  24 ENTRY(v3_copy_user_page)
  25         stmfd   sp!, {r4, lr}                   @       2
  26         mov     r2, #PAGE_SZ/64                 @       1
  27         ldmia   r1!, {r3, r4, ip, lr}           @       4+1
  28 1:      stmia   r0!, {r3, r4, ip, lr}           @       4
  29         ldmia   r1!, {r3, r4, ip, lr}           @       4+1
  30         stmia   r0!, {r3, r4, ip, lr}           @       4
  31         ldmia   r1!, {r3, r4, ip, lr}           @       4+1
  32         stmia   r0!, {r3, r4, ip, lr}           @       4
  33         ldmia   r1!, {r3, r4, ip, lr}           @       4
  34         subs    r2, r2, #1                      @       1
  35         stmia   r0!, {r3, r4, ip, lr}           @       4
  36         ldmneia r1!, {r3, r4, ip, lr}           @       4
  37         bne     1b                              @       1
  38         ldmfd   sp!, {r4, pc}                   @       3
  39
  40         .align  5
  41 /*
  42  * ARMv3 optimised clear_user_page
  43  *
  44  * FIXME: do we need to handle cache stuff...
  45  */
  46 ENTRY(v3_clear_user_page)
  47         str     lr, [sp, #-4]!
  48         mov     r1, #PAGE_SZ/64                 @ 1
  49         mov     r2, #0                          @ 1
  50         mov     r3, #0                          @ 1
  51         mov     ip, #0                          @ 1
  52         mov     lr, #0                          @ 1
  53 1:      stmia   r0!, {r2, r3, ip, lr}           @ 4
  54         stmia   r0!, {r2, r3, ip, lr}           @ 4
  55         stmia   r0!, {r2, r3, ip, lr}           @ 4
  56         stmia   r0!, {r2, r3, ip, lr}           @ 4
  57         subs    r1, r1, #1                      @ 1
  58         bne     1b                              @ 1
  59         ldr     pc, [sp], #4
  60
  61         __INITDATA
  62
  63         .type   v3_user_fns, #object
  64 ENTRY(v3_user_fns)
  65         .long   v3_clear_user_page
  66         .long   v3_copy_user_page
  67         .size   v3_user_fns, . - v3_user_fns