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 __naked
  17 feroceon_copy_user_page(void *kto, const void *kfrom)
  18 {
  19         asm("\
  20         stmfd   sp!, {r4-r9, lr}                \n\
  21         mov     ip, %2                          \n\
  22 1:      mov     lr, r1                          \n\
  23         ldmia   r1!, {r2 - r9}                  \n\
  24         pld     [lr, #32]                       \n\
  25         pld     [lr, #64]                       \n\
  26         pld     [lr, #96]                       \n\
  27         pld     [lr, #128]                      \n\
  28         pld     [lr, #160]                      \n\
  29         pld     [lr, #192]                      \n\
  30         pld     [lr, #224]                      \n\
  31         stmia   r0, {r2 - r9}                   \n\
  32         ldmia   r1!, {r2 - r9}                  \n\
  33         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line\n\
  34         add     r0, r0, #32                     \n\
  35         stmia   r0, {r2 - r9}                   \n\
  36         ldmia   r1!, {r2 - r9}                  \n\
  37         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line\n\
  38         add     r0, r0, #32                     \n\
  39         stmia   r0, {r2 - r9}                   \n\
  40         ldmia   r1!, {r2 - r9}                  \n\
  41         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line\n\
  42         add     r0, r0, #32                     \n\
  43         stmia   r0, {r2 - r9}                   \n\
  44         ldmia   r1!, {r2 - r9}                  \n\
  45         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line\n\
  46         add     r0, r0, #32                     \n\
  47         stmia   r0, {r2 - r9}                   \n\
  48         ldmia   r1!, {r2 - r9}                  \n\
  49         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line\n\
  50         add     r0, r0, #32                     \n\
  51         stmia   r0, {r2 - r9}                   \n\
  52         ldmia   r1!, {r2 - r9}                  \n\
  53         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line\n\
  54         add     r0, r0, #32                     \n\
  55         stmia   r0, {r2 - r9}                   \n\
  56         ldmia   r1!, {r2 - r9}                  \n\
  57         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line\n\
  58         add     r0, r0, #32                     \n\
  59         stmia   r0, {r2 - r9}                   \n\
  60         subs    ip, ip, #(32 * 8)               \n\
  61         mcr     p15, 0, r0, c7, c14, 1          @ clean and invalidate D line\n\
  62         add     r0, r0, #32                     \n\
  63         bne     1b                              \n\
  64         mcr     p15, 0, ip, c7, c10, 4          @ drain WB\n\
  65         ldmfd   sp!, {r4-r9, pc}"
  66         :
  67         : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE));
  68 }
  69
  70 void feroceon_copy_user_highpage(struct page *to, struct page *from,
  71         unsigned long vaddr, struct vm_area_struct *vma)
  72 {
  73         void *kto, *kfrom;
  74
  75         kto = kmap_atomic(to);
  76         kfrom = kmap_atomic(from);
  77         flush_cache_page(vma, vaddr, page_to_pfn(from));
  78         feroceon_copy_user_page(kto, kfrom);
  79         kunmap_atomic(kfrom);
  80         kunmap_atomic(kto);
  81 }
  82
  83 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
  84 {
  85         void *ptr, *kaddr = kmap_atomic(page);
  86         asm volatile ("\
  87         mov     r1, %2                          \n\
  88         mov     r2, #0                          \n\
  89         mov     r3, #0                          \n\
  90         mov     r4, #0                          \n\
  91         mov     r5, #0                          \n\
  92         mov     r6, #0                          \n\
  93         mov     r7, #0                          \n\
  94         mov     ip, #0                          \n\
  95         mov     lr, #0                          \n\
  96 1:      stmia   %0, {r2-r7, ip, lr}             \n\
  97         subs    r1, r1, #1                      \n\
  98         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  99         add     %0, %0, #32                     \n\
 100         bne     1b                              \n\
 101         mcr     p15, 0, r1, c7, c10, 4          @ drain WB"
 102         : "=r" (ptr)
 103         : "0" (kaddr), "I" (PAGE_SIZE / 32)
 104         : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
 105         kunmap_atomic(kaddr);
 106 }
 107
 108 struct cpu_user_fns feroceon_user_fns __initdata = {
 109         .cpu_clear_user_highpage = feroceon_clear_user_highpage,
 110         .cpu_copy_user_highpage = feroceon_copy_user_highpage,
 111 };
 112