1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm/lib/copypage-fa.S 4 * 5 * Copyright (C) 2005 Faraday Corp. 6 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> 7 * 8 * Based on copypage-v4wb.S: 9 * Copyright (C) 1995-1999 Russell King 10 */ 11 #include <linux/init.h> 12 #include <linux/highmem.h> 13 14 /* 15 * Faraday optimised copy_user_page 16 */ 17 static void fa_copy_user_page(void *kto, const void *kfrom) 18 { 19 int tmp; 20 21 asm volatile ("\ 22 1: ldmia %1!, {r3, r4, ip, lr} @ 4\n\ 23 stmia %0, {r3, r4, ip, lr} @ 4\n\ 24 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 25 add %0, %0, #16 @ 1\n\ 26 ldmia %1!, {r3, r4, ip, lr} @ 4\n\ 27 stmia %0, {r3, r4, ip, lr} @ 4\n\ 28 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 29 add %0, %0, #16 @ 1\n\ 30 subs %2, %2, #1 @ 1\n\ 31 bne 1b @ 1\n\ 32 mcr p15, 0, %2, c7, c10, 4 @ 1 drain WB" 33 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) 34 : "2" (PAGE_SIZE / 32) 35 : "r3", "r4", "ip", "lr"); 36 } 37 38 void fa_copy_user_highpage(struct page *to, struct page *from, 39 unsigned long vaddr, struct vm_area_struct *vma) 40 { 41 void *kto, *kfrom; 42 43 kto = kmap_atomic(to); 44 kfrom = kmap_atomic(from); 45 fa_copy_user_page(kto, kfrom); 46 kunmap_atomic(kfrom); 47 kunmap_atomic(kto); 48 } 49 50 /* 51 * Faraday optimised clear_user_page 52 * 53 * Same story as above. 54 */ 55 void fa_clear_user_highpage(struct page *page, unsigned long vaddr) 56 { 57 void *ptr, *kaddr = kmap_atomic(page); 58 asm volatile("\ 59 mov r1, %2 @ 1\n\ 60 mov r2, #0 @ 1\n\ 61 mov r3, #0 @ 1\n\ 62 mov ip, #0 @ 1\n\ 63 mov lr, #0 @ 1\n\ 64 1: stmia %0, {r2, r3, ip, lr} @ 4\n\ 65 mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ 66 add %0, %0, #16 @ 1\n\ 67 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 subs r1, r1, #1 @ 1\n\ 71 bne 1b @ 1\n\ 72 mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB" 73 : "=r" (ptr) 74 : "0" (kaddr), "I" (PAGE_SIZE / 32) 75 : "r1", "r2", "r3", "ip", "lr"); 76 kunmap_atomic(kaddr); 77 } 78 79 struct cpu_user_fns fa_user_fns __initdata = { 80 .cpu_clear_user_highpage = fa_clear_user_highpage, 81 .cpu_copy_user_highpage = fa_copy_user_highpage, 82 }; 83