2 * linux/arch/arm/mm/copypage-v6.c
4 * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
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.
10 #include <linux/init.h>
11 #include <linux/spinlock.h>
15 #include <asm/pgtable.h>
16 #include <asm/shmparam.h>
17 #include <asm/tlbflush.h>
23 #define from_address (0xffff8000)
24 #define from_pgprot PAGE_KERNEL
25 #define to_address (0xffffc000)
26 #define to_pgprot PAGE_KERNEL
28 static pte_t *from_pte;
30 static spinlock_t v6_lock = SPIN_LOCK_UNLOCKED;
32 #define DCACHE_COLOUR(vaddr) ((vaddr & (SHMLBA - 1)) >> PAGE_SHIFT)
35 * Copy the page, taking account of the cache colour.
37 void v6_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
39 unsigned int offset = DCACHE_COLOUR(vaddr);
40 unsigned long from, to;
44 set_pte(from_pte + offset, pfn_pte(__pa(kfrom) >> PAGE_SHIFT, from_pgprot));
45 set_pte(to_pte + offset, pfn_pte(__pa(kto) >> PAGE_SHIFT, to_pgprot));
47 from = from_address + (offset << PAGE_SHIFT);
48 to = to_address + (offset << PAGE_SHIFT);
50 flush_tlb_kernel_page(from);
51 flush_tlb_kernel_page(to);
53 copy_page((void *)to, (void *)from);
55 spin_unlock(&v6_lock);
58 void v6_clear_user_page(void *kaddr, unsigned long vaddr)
60 unsigned int offset = DCACHE_COLOUR(vaddr);
61 unsigned long to = to_address + (offset << PAGE_SHIFT);
65 set_pte(to_pte + offset, pfn_pte(__pa(kaddr) >> PAGE_SHIFT, to_pgprot));
66 flush_tlb_kernel_page(to);
67 clear_page((void *)to);
69 spin_unlock(&v6_lock);
72 struct cpu_user_fns v6_user_fns __initdata = {
73 .cpu_clear_user_page = v6_clear_user_page,
74 .cpu_copy_user_page = v6_copy_user_page,
77 static int __init v6_userpage_init(void)
82 pgd = pgd_offset_k(from_address);
83 pmd = pmd_alloc(&init_mm, pgd, from_address);
86 from_pte = pte_alloc_kernel(&init_mm, pmd, from_address);
90 to_pte = pte_alloc_kernel(&init_mm, pmd, to_address);
97 __initcall(v6_userpage_init);