git.zerfleddert.de Git - ms2-kexec/blob - copypage-v6.c

   1 /*
   2  *  linux/arch/arm/mm/copypage-v6.c
   3  *
   4  *  Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
   5  * This Edition is maintained by Matthew Veety (aliasxerog) <mveety@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/init.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/mm.h>
  14 #include <linux/highmem.h>
  15
  16 #include <asm/pgtable.h>
  17 #include <asm/shmparam.h>
  18 #include <asm/tlbflush.h>
  19 #include <asm/cacheflush.h>
  20 #include <asm/cachetype.h>
  21
  22 #include "mm.h"
  23
  24 #if SHMLBA > 16384
  25 #error FIX ME
  26 #endif
  27
  28 #define from_address    (0xffff8000)
  29 #define to_address      (0xffffc000)
  30
  31 /*
  32  * Copy the user page.  No aliasing to deal with so we can just
  33  * attack the kernel's existing mapping of these pages.
  34  */
  35
  36 static void v6_copy_user_highpage_nonaliasing(struct page *to,
  37         struct page *from, unsigned long vaddr)
  38 {
  39         void *kto, *kfrom;
  40
  41         kfrom = kmap_atomic(from, KM_USER0);
  42         kto = kmap_atomic(to, KM_USER1);
  43         copy_page(kto, kfrom);
  44         kunmap_atomic(kto, KM_USER1);
  45         kunmap_atomic(kfrom, KM_USER0);
  46 }
  47
  48 /*
  49  * Clear the user page.  No aliasing to deal with so we can just
  50  * attack the kernel's existing mapping of this page.
  51  */
  52 static void v6_clear_user_highpage_nonaliasing(struct page *page, unsigned long vaddr)
  53 {
  54         void *kaddr = kmap_atomic(page, KM_USER0);
  55         clear_page(kaddr);
  56         kunmap_atomic(kaddr, KM_USER0);
  57 }
  58
  59
  60 struct cpu_user_fns v6_user_fns __initdata = {
  61         .cpu_clear_user_highpage = v6_clear_user_highpage_nonaliasing,
  62         .cpu_copy_user_highpage = v6_copy_user_highpage_nonaliasing,
  63 };