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 __naked 21 fa_copy_user_page(void *kto, const void *kfrom) 22 { 23 asm("\ 24 stmfd sp!, {r4, lr} @ 2\n\ 25 mov r2, %0 @ 1\n\ 26 1: ldmia r1!, {r3, r4, ip, lr} @ 4\n\ 27 stmia r0, {r3, r4, ip, lr} @ 4\n\ 28 mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 29 add r0, r0, #16 @ 1\n\ 30 ldmia r1!, {r3, r4, ip, lr} @ 4\n\ 31 stmia r0, {r3, r4, ip, lr} @ 4\n\ 32 mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 33 add r0, r0, #16 @ 1\n\ 34 subs r2, r2, #1 @ 1\n\ 35 bne 1b @ 1\n\ 36 mcr p15, 0, r2, c7, c10, 4 @ 1 drain WB\n\ 37 ldmfd sp!, {r4, pc} @ 3" 38 : 39 : "I" (PAGE_SIZE / 32)); 40 } 41 42 void fa_copy_user_highpage(struct page *to, struct page *from, 43 unsigned long vaddr, struct vm_area_struct *vma) 44 { 45 void *kto, *kfrom; 46 47 kto = kmap_atomic(to); 48 kfrom = kmap_atomic(from); 49 fa_copy_user_page(kto, kfrom); 50 kunmap_atomic(kfrom); 51 kunmap_atomic(kto); 52 } 53 54 /* 55 * Faraday optimised clear_user_page 56 * 57 * Same story as above. 58 */ 59 void fa_clear_user_highpage(struct page *page, unsigned long vaddr) 60 { 61 void *ptr, *kaddr = kmap_atomic(page); 62 asm volatile("\ 63 mov r1, %2 @ 1\n\ 64 mov r2, #0 @ 1\n\ 65 mov r3, #0 @ 1\n\ 66 mov ip, #0 @ 1\n\ 67 mov lr, #0 @ 1\n\ 68 1: stmia %0, {r2, r3, ip, lr} @ 4\n\ 69 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 70 add %0, %0, #16 @ 1\n\ 71 stmia %0, {r2, r3, ip, lr} @ 4\n\ 72 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 73 add %0, %0, #16 @ 1\n\ 74 subs r1, r1, #1 @ 1\n\ 75 bne 1b @ 1\n\ 76 mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB" 77 : "=r" (ptr) 78 : "0" (kaddr), "I" (PAGE_SIZE / 32) 79 : "r1", "r2", "r3", "ip", "lr"); 80 kunmap_atomic(kaddr); 81 } 82 83 struct cpu_user_fns fa_user_fns __initdata = { 84 .cpu_clear_user_highpage = fa_clear_user_highpage, 85 .cpu_copy_user_highpage = fa_copy_user_highpage, 86 }; 87