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 */ 20 static void fa_copy_user_page(void *kto, const void *kfrom) 21 { 22 int tmp; 23 24 asm volatile ("\ 25 1: ldmia %1!, {r3, r4, ip, lr} @ 4\n\ 26 stmia %0, {r3, r4, ip, lr} @ 4\n\ 27 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 28 add %0, %0, #16 @ 1\n\ 29 ldmia %1!, {r3, r4, ip, lr} @ 4\n\ 30 stmia %0, {r3, r4, ip, lr} @ 4\n\ 31 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 32 add %0, %0, #16 @ 1\n\ 33 subs %2, %2, #1 @ 1\n\ 34 bne 1b @ 1\n\ 35 mcr p15, 0, %2, c7, c10, 4 @ 1 drain WB" 36 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) 37 : "2" (PAGE_SIZE / 32) 38 : "r3", "r4", "ip", "lr"); 39 } 40 41 void fa_copy_user_highpage(struct page *to, struct page *from, 42 unsigned long vaddr, struct vm_area_struct *vma) 43 { 44 void *kto, *kfrom; 45 46 kto = kmap_atomic(to); 47 kfrom = kmap_atomic(from); 48 fa_copy_user_page(kto, kfrom); 49 kunmap_atomic(kfrom); 50 kunmap_atomic(kto); 51 } 52 53 /* 54 * Faraday optimised clear_user_page 55 * 56 * Same story as above. 57 */ 58 void fa_clear_user_highpage(struct page *page, unsigned long vaddr) 59 { 60 void *ptr, *kaddr = kmap_atomic(page); 61 asm volatile("\ 62 mov r1, %2 @ 1\n\ 63 mov r2, #0 @ 1\n\ 64 mov r3, #0 @ 1\n\ 65 mov ip, #0 @ 1\n\ 66 mov lr, #0 @ 1\n\ 67 1: stmia %0, {r2, r3, ip, lr} @ 4\n\ 68 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 69 add %0, %0, #16 @ 1\n\ 70 stmia %0, {r2, r3, ip, lr} @ 4\n\ 71 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 72 add %0, %0, #16 @ 1\n\ 73 subs r1, r1, #1 @ 1\n\ 74 bne 1b @ 1\n\ 75 mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB" 76 : "=r" (ptr) 77 : "0" (kaddr), "I" (PAGE_SIZE / 32) 78 : "r1", "r2", "r3", "ip", "lr"); 79 kunmap_atomic(kaddr); 80 } 81 82 struct cpu_user_fns fa_user_fns __initdata = { 83 .cpu_clear_user_highpage = fa_clear_user_highpage, 84 .cpu_copy_user_highpage = fa_copy_user_highpage, 85 }; 86