2 * linux/arch/arm/mm/copypage-xsc3.S
4 * Copyright (C) 2004 Intel Corp.
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 * Adapted for 3rd gen XScale core, no more mini-dcache
11 * Author: Matt Gilbert (matthew.m.gilbert@intel.com)
13 #include <linux/init.h>
19 * We don't really want write-allocate cache behaviour for these functions
20 * since that will just eat through 8K of the cache.
24 * XSC3 optimised copy_user_page
27 * r2 = virtual user address of ultimate destination page
29 * The source page may have some clean entries in the cache already, but we
30 * can safely ignore them - break_cow() will flush them out of the cache
31 * if we eventually end up using our copied page.
34 void __attribute__((naked))
35 xsc3_mc_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
38 stmfd sp!, {r4, r5, lr} \n\
46 2: ldrd r2, [r1], #8 \n\
49 mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\
59 mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\
70 ldmfd sp!, {r4, r5, pc}"
72 : "I" (PAGE_SIZE / 64 - 1));
76 * XScale optimised clear_user_page
78 * r1 = virtual user address of ultimate destination page
80 void __attribute__((naked))
81 xsc3_mc_clear_user_page(void *kaddr, unsigned long vaddr)
87 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate line\n\
96 : "I" (PAGE_SIZE / 32));
99 struct cpu_user_fns xsc3_mc_user_fns __initdata = {
100 .cpu_clear_user_page = xsc3_mc_clear_user_page,
101 .cpu_copy_user_page = xsc3_mc_copy_user_page,