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 __naked 17 feroceon_copy_user_page(void *kto, const void *kfrom) 18 { 19 asm("\ 20 stmfd sp!, {r4-r9, lr} \n\ 21 mov ip, %2 \n\ 22 1: mov lr, r1 \n\ 23 ldmia r1!, {r2 - r9} \n\ 24 pld [lr, #32] \n\ 25 pld [lr, #64] \n\ 26 pld [lr, #96] \n\ 27 pld [lr, #128] \n\ 28 pld [lr, #160] \n\ 29 pld [lr, #192] \n\ 30 pld [lr, #224] \n\ 31 stmia r0, {r2 - r9} \n\ 32 ldmia r1!, {r2 - r9} \n\ 33 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ 34 add r0, r0, #32 \n\ 35 stmia r0, {r2 - r9} \n\ 36 ldmia r1!, {r2 - r9} \n\ 37 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ 38 add r0, r0, #32 \n\ 39 stmia r0, {r2 - r9} \n\ 40 ldmia r1!, {r2 - r9} \n\ 41 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ 42 add r0, r0, #32 \n\ 43 stmia r0, {r2 - r9} \n\ 44 ldmia r1!, {r2 - r9} \n\ 45 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ 46 add r0, r0, #32 \n\ 47 stmia r0, {r2 - r9} \n\ 48 ldmia r1!, {r2 - r9} \n\ 49 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ 50 add r0, r0, #32 \n\ 51 stmia r0, {r2 - r9} \n\ 52 ldmia r1!, {r2 - r9} \n\ 53 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ 54 add r0, r0, #32 \n\ 55 stmia r0, {r2 - r9} \n\ 56 ldmia r1!, {r2 - r9} \n\ 57 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ 58 add r0, r0, #32 \n\ 59 stmia r0, {r2 - r9} \n\ 60 subs ip, ip, #(32 * 8) \n\ 61 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ 62 add r0, r0, #32 \n\ 63 bne 1b \n\ 64 mcr p15, 0, ip, c7, c10, 4 @ drain WB\n\ 65 ldmfd sp!, {r4-r9, pc}" 66 : 67 : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE)); 68 } 69 70 void feroceon_copy_user_highpage(struct page *to, struct page *from, 71 unsigned long vaddr, struct vm_area_struct *vma) 72 { 73 void *kto, *kfrom; 74 75 kto = kmap_atomic(to); 76 kfrom = kmap_atomic(from); 77 flush_cache_page(vma, vaddr, page_to_pfn(from)); 78 feroceon_copy_user_page(kto, kfrom); 79 kunmap_atomic(kfrom); 80 kunmap_atomic(kto); 81 } 82 83 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr) 84 { 85 void *ptr, *kaddr = kmap_atomic(page); 86 asm volatile ("\ 87 mov r1, %2 \n\ 88 mov r2, #0 \n\ 89 mov r3, #0 \n\ 90 mov r4, #0 \n\ 91 mov r5, #0 \n\ 92 mov r6, #0 \n\ 93 mov r7, #0 \n\ 94 mov ip, #0 \n\ 95 mov lr, #0 \n\ 96 1: stmia %0, {r2-r7, ip, lr} \n\ 97 subs r1, r1, #1 \n\ 98 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 99 add %0, %0, #32 \n\ 100 bne 1b \n\ 101 mcr p15, 0, r1, c7, c10, 4 @ drain WB" 102 : "=r" (ptr) 103 : "0" (kaddr), "I" (PAGE_SIZE / 32) 104 : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); 105 kunmap_atomic(kaddr); 106 } 107 108 struct cpu_user_fns feroceon_user_fns __initdata = { 109 .cpu_clear_user_highpage = feroceon_clear_user_highpage, 110 .cpu_copy_user_highpage = feroceon_copy_user_highpage, 111 }; 112 113