1 /* 2 * linux/arch/arm/mm/copypage-feroceon.S 3 * 4 * Copyright (C) 2008 Marvell Semiconductors 5 * 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. 9 * 10 * This handles copy_user_highpage and clear_user_page on Feroceon 11 * more optimally than the generic implementations. 12 */ 13 #include <linux/init.h> 14 #include <linux/highmem.h> 15 16 static void feroceon_copy_user_page(void *kto, const void *kfrom) 17 { 18 int tmp; 19 20 asm volatile ("\ 21 1: ldmia %1!, {r2 - r7, ip, lr} \n\ 22 pld [%1, #0] \n\ 23 pld [%1, #32] \n\ 24 pld [%1, #64] \n\ 25 pld [%1, #96] \n\ 26 pld [%1, #128] \n\ 27 pld [%1, #160] \n\ 28 pld [%1, #192] \n\ 29 stmia %0, {r2 - r7, ip, lr} \n\ 30 ldmia %1!, {r2 - r7, ip, lr} \n\ 31 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 32 add %0, %0, #32 \n\ 33 stmia %0, {r2 - r7, ip, lr} \n\ 34 ldmia %1!, {r2 - r7, ip, lr} \n\ 35 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 36 add %0, %0, #32 \n\ 37 stmia %0, {r2 - r7, ip, lr} \n\ 38 ldmia %1!, {r2 - r7, ip, lr} \n\ 39 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 40 add %0, %0, #32 \n\ 41 stmia %0, {r2 - r7, ip, lr} \n\ 42 ldmia %1!, {r2 - r7, ip, lr} \n\ 43 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 44 add %0, %0, #32 \n\ 45 stmia %0, {r2 - r7, ip, lr} \n\ 46 ldmia %1!, {r2 - r7, ip, lr} \n\ 47 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 48 add %0, %0, #32 \n\ 49 stmia %0, {r2 - r7, ip, lr} \n\ 50 ldmia %1!, {r2 - r7, ip, lr} \n\ 51 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 52 add %0, %0, #32 \n\ 53 stmia %0, {r2 - r7, ip, lr} \n\ 54 ldmia %1!, {r2 - r7, ip, lr} \n\ 55 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 56 add %0, %0, #32 \n\ 57 stmia %0, {r2 - r7, ip, lr} \n\ 58 subs %2, %2, #(32 * 8) \n\ 59 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 60 add %0, %0, #32 \n\ 61 bne 1b \n\ 62 mcr p15, 0, %2, c7, c10, 4 @ drain WB" 63 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) 64 : "2" (PAGE_SIZE) 65 : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); 66 } 67 68 void feroceon_copy_user_highpage(struct page *to, struct page *from, 69 unsigned long vaddr, struct vm_area_struct *vma) 70 { 71 void *kto, *kfrom; 72 73 kto = kmap_atomic(to); 74 kfrom = kmap_atomic(from); 75 flush_cache_page(vma, vaddr, page_to_pfn(from)); 76 feroceon_copy_user_page(kto, kfrom); 77 kunmap_atomic(kfrom); 78 kunmap_atomic(kto); 79 } 80 81 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr) 82 { 83 void *ptr, *kaddr = kmap_atomic(page); 84 asm volatile ("\ 85 mov r1, %2 \n\ 86 mov r2, #0 \n\ 87 mov r3, #0 \n\ 88 mov r4, #0 \n\ 89 mov r5, #0 \n\ 90 mov r6, #0 \n\ 91 mov r7, #0 \n\ 92 mov ip, #0 \n\ 93 mov lr, #0 \n\ 94 1: stmia %0, {r2-r7, ip, lr} \n\ 95 subs r1, r1, #1 \n\ 96 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 97 add %0, %0, #32 \n\ 98 bne 1b \n\ 99 mcr p15, 0, r1, c7, c10, 4 @ drain WB" 100 : "=r" (ptr) 101 : "0" (kaddr), "I" (PAGE_SIZE / 32) 102 : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); 103 kunmap_atomic(kaddr); 104 } 105 106 struct cpu_user_fns feroceon_user_fns __initdata = { 107 .cpu_clear_user_highpage = feroceon_clear_user_highpage, 108 .cpu_copy_user_highpage = feroceon_copy_user_highpage, 109 }; 110 111