LXR linux/arch/arm/mm/copypage-fa.c

   1/*
   2 *  linux/arch/arm/lib/copypage-fa.S
   3 *
   4 *  Copyright (C) 2005 Faraday Corp.
   5 *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
   6 *
   7 * Based on copypage-v4wb.S:
   8 *  Copyright (C) 1995-1999 Russell King
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2 as
  12 * published by the Free Software Foundation.
  13 */
  14#include <linux/init.h>
  15#include <linux/highmem.h>
  16
  17/*
  18 * Faraday optimised copy_user_page
  19 */
  20static void fa_copy_user_page(void *kto, const void *kfrom)
  21{
  22        int tmp;
  23
  24        asm volatile ("\
  251:      ldmia   %1!, {r3, r4, ip, lr}           @ 4\n\
  26        stmia   %0, {r3, r4, ip, lr}            @ 4\n\
  27        mcr     p15, 0, %0, c7, c14, 1          @ 1   clean and invalidate D line\n\
  28        add     %0, %0, #16                     @ 1\n\
  29        ldmia   %1!, {r3, r4, ip, lr}           @ 4\n\
  30        stmia   %0, {r3, r4, ip, lr}            @ 4\n\
  31        mcr     p15, 0, %0, c7, c14, 1          @ 1   clean and invalidate D line\n\
  32        add     %0, %0, #16                     @ 1\n\
  33        subs    %2, %2, #1                      @ 1\n\
  34        bne     1b                              @ 1\n\
  35        mcr     p15, 0, %2, c7, c10, 4          @ 1   drain WB"
  36        : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
  37        : "2" (PAGE_SIZE / 32)
  38        : "r3", "r4", "ip", "lr");
  39}
  40
  41void fa_copy_user_highpage(struct page *to, struct page *from,
  42        unsigned long vaddr, struct vm_area_struct *vma)
  43{
  44        void *kto, *kfrom;
  45
  46        kto = kmap_atomic(to);
  47        kfrom = kmap_atomic(from);
  48        fa_copy_user_page(kto, kfrom);
  49        kunmap_atomic(kfrom);
  50        kunmap_atomic(kto);
  51}
  52
  53/*
  54 * Faraday optimised clear_user_page
  55 *
  56 * Same story as above.
  57 */
  58void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
  59{
  60        void *ptr, *kaddr = kmap_atomic(page);
  61        asm volatile("\
  62        mov     r1, %2                          @ 1\n\
  63        mov     r2, #0                          @ 1\n\
  64        mov     r3, #0                          @ 1\n\
  65        mov     ip, #0                          @ 1\n\
  66        mov     lr, #0                          @ 1\n\
  671:      stmia   %0, {r2, r3, ip, lr}            @ 4\n\
  68        mcr     p15, 0, %0, c7, c14, 1          @ 1   clean and invalidate D line\n\
  69        add     %0, %0, #16                     @ 1\n\
  70        stmia   %0, {r2, r3, ip, lr}            @ 4\n\
  71        mcr     p15, 0, %0, c7, c14, 1          @ 1   clean and invalidate D line\n\
  72        add     %0, %0, #16                     @ 1\n\
  73        subs    r1, r1, #1                      @ 1\n\
  74        bne     1b                              @ 1\n\
  75        mcr     p15, 0, r1, c7, c10, 4          @ 1   drain WB"
  76        : "=r" (ptr)
  77        : "0" (kaddr), "I" (PAGE_SIZE / 32)
  78        : "r1", "r2", "r3", "ip", "lr");
  79        kunmap_atomic(kaddr);
  80}
  81
  82struct cpu_user_fns fa_user_fns __initdata = {
  83        .cpu_clear_user_highpage = fa_clear_user_highpage,
  84        .cpu_copy_user_highpage = fa_copy_user_highpage,
  85};
  86