arch/arm/mm/copypage-feroceon.c

   1 /*
   2  *  linux/arch/arm/mm/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_highpage and clear_user_page on Feroceon
  11  * more optimally than the generic implementations.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/highmem.h>
  15
  16 static void feroceon_copy_user_page(void *kto, const void *kfrom)
  17 {
  18         int tmp;
  19
  20         asm volatile ("\
  21 1:      ldmia   %1!, {r2 - r7, ip, lr}          \n\
  22         pld     [%1, #0]                        \n\
  23         pld     [%1, #32]                       \n\
  24         pld     [%1, #64]                       \n\
  25         pld     [%1, #96]                       \n\
  26         pld     [%1, #128]                      \n\
  27         pld     [%1, #160]                      \n\
  28         pld     [%1, #192]                      \n\
  29         stmia   %0, {r2 - r7, ip, lr}           \n\
  30         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  31         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  32         add     %0, %0, #32                     \n\
  33         stmia   %0, {r2 - r7, ip, lr}           \n\
  34         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  35         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  36         add     %0, %0, #32                     \n\
  37         stmia   %0, {r2 - r7, ip, lr}           \n\
  38         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  39         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  40         add     %0, %0, #32                     \n\
  41         stmia   %0, {r2 - r7, ip, lr}           \n\
  42         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  43         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  44         add     %0, %0, #32                     \n\
  45         stmia   %0, {r2 - r7, ip, lr}           \n\
  46         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  47         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  48         add     %0, %0, #32                     \n\
  49         stmia   %0, {r2 - r7, ip, lr}           \n\
  50         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  51         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  52         add     %0, %0, #32                     \n\
  53         stmia   %0, {r2 - r7, ip, lr}           \n\
  54         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  55         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  56         add     %0, %0, #32                     \n\
  57         stmia   %0, {r2 - r7, ip, lr}           \n\
  58         subs    %2, %2, #(32 * 8)               \n\
  59         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  60         add     %0, %0, #32                     \n\
  61         bne     1b                              \n\
  62         mcr     p15, 0, %2, c7, c10, 4          @ drain WB"
  63         : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
  64         : "2" (PAGE_SIZE)
  65         : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
  66 }
  67
  68 void feroceon_copy_user_highpage(struct page *to, struct page *from,
  69         unsigned long vaddr, struct vm_area_struct *vma)
  70 {
  71         void *kto, *kfrom;
  72
  73         kto = kmap_atomic(to);
  74         kfrom = kmap_atomic(from);
  75         flush_cache_page(vma, vaddr, page_to_pfn(from));
  76         feroceon_copy_user_page(kto, kfrom);
  77         kunmap_atomic(kfrom);
  78         kunmap_atomic(kto);
  79 }
  80
  81 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
  82 {
  83         void *ptr, *kaddr = kmap_atomic(page);
  84         asm volatile ("\
  85         mov     r1, %2                          \n\
  86         mov     r2, #0                          \n\
  87         mov     r3, #0                          \n\
  88         mov     r4, #0                          \n\
  89         mov     r5, #0                          \n\
  90         mov     r6, #0                          \n\
  91         mov     r7, #0                          \n\
  92         mov     ip, #0                          \n\
  93         mov     lr, #0                          \n\
  94 1:      stmia   %0, {r2-r7, ip, lr}             \n\
  95         subs    r1, r1, #1                      \n\
  96         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  97         add     %0, %0, #32                     \n\
  98         bne     1b                              \n\
  99         mcr     p15, 0, r1, c7, c10, 4          @ drain WB"
 100         : "=r" (ptr)
 101         : "0" (kaddr), "I" (PAGE_SIZE / 32)
 102         : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
 103         kunmap_atomic(kaddr);
 104 }
 105
 106 struct cpu_user_fns feroceon_user_fns __initdata = {
 107         .cpu_clear_user_highpage = feroceon_clear_user_highpage,
 108         .cpu_copy_user_highpage = feroceon_copy_user_highpage,
 109 };
 110