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 __naked
  21fa_copy_user_page(void *kto, const void *kfrom)
  22{
  23        asm("\
  24        stmfd   sp!, {r4, lr}                   @ 2\n\
  25        mov     r2, %0                          @ 1\n\
  261:      ldmia   r1!, {r3, r4, ip, lr}           @ 4\n\
  27        stmia   r0, {r3, r4, ip, lr}            @ 4\n\
  28        mcr     p15, 0, r0, c7, c14, 1          @ 1   clean and invalidate D line\n\
  29        add     r0, r0, #16                     @ 1\n\
  30        ldmia   r1!, {r3, r4, ip, lr}           @ 4\n\
  31        stmia   r0, {r3, r4, ip, lr}            @ 4\n\
  32        mcr     p15, 0, r0, c7, c14, 1          @ 1   clean and invalidate D line\n\
  33        add     r0, r0, #16                     @ 1\n\
  34        subs    r2, r2, #1                      @ 1\n\
  35        bne     1b                              @ 1\n\
  36        mcr     p15, 0, r2, c7, c10, 4          @ 1   drain WB\n\
  37        ldmfd   sp!, {r4, pc}                   @ 3"
  38        :
  39        : "I" (PAGE_SIZE / 32));
  40}
  41
  42void fa_copy_user_highpage(struct page *to, struct page *from,
  43        unsigned long vaddr, struct vm_area_struct *vma)
  44{
  45        void *kto, *kfrom;
  46
  47        kto = kmap_atomic(to);
  48        kfrom = kmap_atomic(from);
  49        fa_copy_user_page(kto, kfrom);
  50        kunmap_atomic(kfrom);
  51        kunmap_atomic(kto);
  52}
  53
  54/*
  55 * Faraday optimised clear_user_page
  56 *
  57 * Same story as above.
  58 */
  59void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
  60{
  61        void *ptr, *kaddr = kmap_atomic(page);
  62        asm volatile("\
  63        mov     r1, %2                          @ 1\n\
  64        mov     r2, #0                          @ 1\n\
  65        mov     r3, #0                          @ 1\n\
  66        mov     ip, #0                          @ 1\n\
  67        mov     lr, #0                          @ 1\n\
  681:      stmia   %0, {r2, r3, ip, lr}            @ 4\n\
  69        mcr     p15, 0, %0, c7, c14, 1          @ 1   clean and invalidate D line\n\
  70        add     %0, %0, #16                     @ 1\n\
  71        stmia   %0, {r2, r3, ip, lr}            @ 4\n\
  72        mcr     p15, 0, %0, c7, c14, 1          @ 1   clean and invalidate D line\n\
  73        add     %0, %0, #16                     @ 1\n\
  74        subs    r1, r1, #1                      @ 1\n\
  75        bne     1b                              @ 1\n\
  76        mcr     p15, 0, r1, c7, c10, 4          @ 1   drain WB"
  77        : "=r" (ptr)
  78        : "0" (kaddr), "I" (PAGE_SIZE / 32)
  79        : "r1", "r2", "r3", "ip", "lr");
  80        kunmap_atomic(kaddr);
  81}
  82
  83struct cpu_user_fns fa_user_fns __initdata = {
  84        .cpu_clear_user_highpage = fa_clear_user_highpage,
  85        .cpu_copy_user_highpage = fa_copy_user_highpage,
  86};
  87