1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm/mm/copypage-feroceon.S 4 * 5 * Copyright (C) 2008 Marvell Semiconductors 6 * 7 * This handles copy_user_highpage and clear_user_page on Feroceon 8 * more optimally than the generic implementations. 9 */ 10 #include <linux/init.h> 11 #include <linux/highmem.h> 12 13 static void feroceon_copy_user_page(void *kto, const void *kfrom) 14 { 15 int tmp; 16 17 asm volatile ("\ 18 1: ldmia %1!, {r2 - r7, ip, lr} \n\ 19 pld [%1, #0] \n\ 20 pld [%1, #32] \n\ 21 pld [%1, #64] \n\ 22 pld [%1, #96] \n\ 23 pld [%1, #128] \n\ 24 pld [%1, #160] \n\ 25 pld [%1, #192] \n\ 26 stmia %0, {r2 - r7, ip, lr} \n\ 27 ldmia %1!, {r2 - r7, ip, lr} \n\ 28 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 29 add %0, %0, #32 \n\ 30 stmia %0, {r2 - r7, ip, lr} \n\ 31 ldmia %1!, {r2 - r7, ip, lr} \n\ 32 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 33 add %0, %0, #32 \n\ 34 stmia %0, {r2 - r7, ip, lr} \n\ 35 ldmia %1!, {r2 - r7, ip, lr} \n\ 36 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 37 add %0, %0, #32 \n\ 38 stmia %0, {r2 - r7, ip, lr} \n\ 39 ldmia %1!, {r2 - r7, ip, lr} \n\ 40 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 41 add %0, %0, #32 \n\ 42 stmia %0, {r2 - r7, ip, lr} \n\ 43 ldmia %1!, {r2 - r7, ip, lr} \n\ 44 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 45 add %0, %0, #32 \n\ 46 stmia %0, {r2 - r7, ip, lr} \n\ 47 ldmia %1!, {r2 - r7, ip, lr} \n\ 48 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 49 add %0, %0, #32 \n\ 50 stmia %0, {r2 - r7, ip, lr} \n\ 51 ldmia %1!, {r2 - r7, ip, lr} \n\ 52 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 53 add %0, %0, #32 \n\ 54 stmia %0, {r2 - r7, ip, lr} \n\ 55 subs %2, %2, #(32 * 8) \n\ 56 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 57 add %0, %0, #32 \n\ 58 bne 1b \n\ 59 mcr p15, 0, %2, c7, c10, 4 @ drain WB" 60 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) 61 : "2" (PAGE_SIZE) 62 : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); 63 } 64 65 void feroceon_copy_user_highpage(struct page *to, struct page *from, 66 unsigned long vaddr, struct vm_area_struct *vma) 67 { 68 void *kto, *kfrom; 69 70 kto = kmap_atomic(to); 71 kfrom = kmap_atomic(from); 72 flush_cache_page(vma, vaddr, page_to_pfn(from)); 73 feroceon_copy_user_page(kto, kfrom); 74 kunmap_atomic(kfrom); 75 kunmap_atomic(kto); 76 } 77 78 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr) 79 { 80 void *ptr, *kaddr = kmap_atomic(page); 81 asm volatile ("\ 82 mov r1, %2 \n\ 83 mov r2, #0 \n\ 84 mov r3, #0 \n\ 85 mov r4, #0 \n\ 86 mov r5, #0 \n\ 87 mov r6, #0 \n\ 88 mov r7, #0 \n\ 89 mov ip, #0 \n\ 90 mov lr, #0 \n\ 91 1: stmia %0, {r2-r7, ip, lr} \n\ 92 subs r1, r1, #1 \n\ 93 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ 94 add %0, %0, #32 \n\ 95 bne 1b \n\ 96 mcr p15, 0, r1, c7, c10, 4 @ drain WB" 97 : "=r" (ptr) 98 : "0" (kaddr), "I" (PAGE_SIZE / 32) 99 : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); 100 kunmap_atomic(kaddr); 101 } 102 103 struct cpu_user_fns feroceon_user_fns __initdata = { 104 .cpu_clear_user_highpage = feroceon_clear_user_highpage, 105 .cpu_copy_user_highpage = feroceon_copy_user_highpage, 106 }; 107 108