arch/arm/mm/copypage-feroceon.S

   1 /*
   2  *  linux/arch/arm/lib/copypage-feroceon.S
   3  *
   4  *  Copyright (C) 2008 Marvell Semiconductors
   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  * This handles copy_user_page and clear_user_page on Feroceon
  11  * more optimally than the generic implementations.
  12  */
  13 #include <linux/linkage.h>
  14 #include <linux/init.h>
  15 #include <asm/asm-offsets.h>
  16
  17         .text
  18         .align  5
  19
  20 ENTRY(feroceon_copy_user_page)
  21         stmfd   sp!, {r4-r9, lr}
  22         mov     ip, #PAGE_SZ
  23 1:      mov     lr, r1
  24         ldmia   r1!, {r2 - r9}
  25         pld     [lr, #32]
  26         pld     [lr, #64]
  27         pld     [lr, #96]
  28         pld     [lr, #128]
  29         pld     [lr, #160]
  30         pld     [lr, #192]
  31         pld     [lr, #224]
  32         stmia   r0, {r2 - r9}
  33         ldmia   r1!, {r2 - r9}
  34         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line
  35         add     r0, r0, #32
  36         stmia   r0, {r2 - r9}
  37         ldmia   r1!, {r2 - r9}
  38         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line
  39         add     r0, r0, #32
  40         stmia   r0, {r2 - r9}
  41         ldmia   r1!, {r2 - r9}
  42         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line
  43         add     r0, r0, #32
  44         stmia   r0, {r2 - r9}
  45         ldmia   r1!, {r2 - r9}
  46         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line
  47         add     r0, r0, #32
  48         stmia   r0, {r2 - r9}
  49         ldmia   r1!, {r2 - r9}
  50         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line
  51         add     r0, r0, #32
  52         stmia   r0, {r2 - r9}
  53         ldmia   r1!, {r2 - r9}
  54         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line
  55         add     r0, r0, #32
  56         stmia   r0, {r2 - r9}
  57         ldmia   r1!, {r2 - r9}
  58         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line
  59         add     r0, r0, #32
  60         stmia   r0, {r2 - r9}
  61         subs    ip, ip, #(32 * 8)
  62         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line
  63         add     r0, r0, #32
  64         bne     1b
  65         mcr     p15, 0, ip, c7, c10, 4          @ drain WB
  66         ldmfd   sp!, {r4-r9, pc}
  67
  68         .align  5
  69
  70 ENTRY(feroceon_clear_user_page)
  71         stmfd   sp!, {r4-r7, lr}
  72         mov     r1, #PAGE_SZ/32
  73         mov     r2, #0
  74         mov     r3, #0
  75         mov     r4, #0
  76         mov     r5, #0
  77         mov     r6, #0
  78         mov     r7, #0
  79         mov     ip, #0
  80         mov     lr, #0
  81 1:      stmia   r0, {r2-r7, ip, lr}
  82         subs    r1, r1, #1
  83         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line
  84         add     r0, r0, #32
  85         bne     1b
  86         mcr     p15, 0, r1, c7, c10, 4          @ drain WB
  87         ldmfd   sp!, {r4-r7, pc}
  88
  89         __INITDATA
  90
  91         .type   feroceon_user_fns, #object
  92 ENTRY(feroceon_user_fns)
  93         .long   feroceon_clear_user_page
  94         .long   feroceon_copy_user_page
  95         .size   feroceon_user_fns, . - feroceon_user_fns