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copypage-feroceon.c

/*
 *  linux/arch/arm/mm/copypage-feroceon.S
 *
 *  Copyright (C) 2008 Marvell Semiconductors
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This handles copy_user_highpage and clear_user_page on Feroceon
 * more optimally than the generic implementations.
 */
#include <linux/init.h>
#include <linux/highmem.h>

static void __naked
feroceon_copy_user_page(void *kto, const void *kfrom)
{
      asm("\
      stmfd sp!, {r4-r9, lr}        \n\
      mov   ip, %2                        \n\
1:    mov   lr, r1                        \n\
      ldmia r1!, {r2 - r9}                \n\
      pld   [lr, #32]               \n\
      pld   [lr, #64]               \n\
      pld   [lr, #96]               \n\
      pld   [lr, #128]              \n\
      pld   [lr, #160]              \n\
      pld   [lr, #192]              \n\
      pld   [lr, #224]              \n\
      stmia r0, {r2 - r9}                 \n\
      ldmia r1!, {r2 - r9}                \n\
      mcr   p15, 0, r0, c7, c14, 1        @ clean and invalidate D line\n\
      add   r0, r0, #32             \n\
      stmia r0, {r2 - r9}                 \n\
      ldmia r1!, {r2 - r9}                \n\
      mcr   p15, 0, r0, c7, c14, 1        @ clean and invalidate D line\n\
      add   r0, r0, #32             \n\
      stmia r0, {r2 - r9}                 \n\
      ldmia r1!, {r2 - r9}                \n\
      mcr   p15, 0, r0, c7, c14, 1        @ clean and invalidate D line\n\
      add   r0, r0, #32             \n\
      stmia r0, {r2 - r9}                 \n\
      ldmia r1!, {r2 - r9}                \n\
      mcr   p15, 0, r0, c7, c14, 1        @ clean and invalidate D line\n\
      add   r0, r0, #32             \n\
      stmia r0, {r2 - r9}                 \n\
      ldmia r1!, {r2 - r9}                \n\
      mcr   p15, 0, r0, c7, c14, 1        @ clean and invalidate D line\n\
      add   r0, r0, #32             \n\
      stmia r0, {r2 - r9}                 \n\
      ldmia r1!, {r2 - r9}                \n\
      mcr   p15, 0, r0, c7, c14, 1        @ clean and invalidate D line\n\
      add   r0, r0, #32             \n\
      stmia r0, {r2 - r9}                 \n\
      ldmia r1!, {r2 - r9}                \n\
      mcr   p15, 0, r0, c7, c14, 1        @ clean and invalidate D line\n\
      add   r0, r0, #32             \n\
      stmia r0, {r2 - r9}                 \n\
      subs  ip, ip, #(32 * 8)       \n\
      mcr   p15, 0, r0, c7, c14, 1        @ clean and invalidate D line\n\
      add   r0, r0, #32             \n\
      bne   1b                      \n\
      mcr   p15, 0, ip, c7, c10, 4        @ drain WB\n\
      ldmfd sp!, {r4-r9, pc}"
      :
      : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE));
}

void feroceon_copy_user_highpage(struct page *to, struct page *from,
      unsigned long vaddr, struct vm_area_struct *vma)
{
      void *kto, *kfrom;

      kto = kmap_atomic(to, KM_USER0);
      kfrom = kmap_atomic(from, KM_USER1);
      flush_cache_page(vma, vaddr, page_to_pfn(from));
      feroceon_copy_user_page(kto, kfrom);
      kunmap_atomic(kfrom, KM_USER1);
      kunmap_atomic(kto, KM_USER0);
}

void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
{
      void *ptr, *kaddr = kmap_atomic(page, KM_USER0);
      asm volatile ("\
      mov   r1, %2                        \n\
      mov   r2, #0                        \n\
      mov   r3, #0                        \n\
      mov   r4, #0                        \n\
      mov   r5, #0                        \n\
      mov   r6, #0                        \n\
      mov   r7, #0                        \n\
      mov   ip, #0                        \n\
      mov   lr, #0                        \n\
1:    stmia %0, {r2-r7, ip, lr}           \n\
      subs  r1, r1, #1              \n\
      mcr   p15, 0, %0, c7, c14, 1        @ clean and invalidate D line\n\
      add   %0, %0, #32             \n\
      bne   1b                      \n\
      mcr   p15, 0, r1, c7, c10, 4        @ drain WB"
      : "=r" (ptr)
      : "0" (kaddr), "I" (PAGE_SIZE / 32)
      : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
      kunmap_atomic(kaddr, KM_USER0);
}

struct cpu_user_fns feroceon_user_fns __initdata = {
      .cpu_clear_user_highpage = feroceon_clear_user_highpage,
      .cpu_copy_user_highpage = feroceon_copy_user_highpage,
};


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