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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | // SPDX-License-Identifier: GPL-2.0-only /* * linux/arch/arm/mm/copypage-feroceon.S * * Copyright (C) 2008 Marvell Semiconductors * * This handles copy_user_highpage and clear_user_page on Feroceon * more optimally than the generic implementations. */ #include <linux/init.h> #include <linux/highmem.h> static void feroceon_copy_user_page(void *kto, const void *kfrom) { int tmp; asm volatile ("\ .arch armv5te \n\ 1: ldmia %1!, {r2 - r7, ip, lr} \n\ pld [%1, #0] \n\ pld [%1, #32] \n\ pld [%1, #64] \n\ pld [%1, #96] \n\ pld [%1, #128] \n\ pld [%1, #160] \n\ pld [%1, #192] \n\ stmia %0, {r2 - r7, ip, lr} \n\ ldmia %1!, {r2 - r7, ip, lr} \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ stmia %0, {r2 - r7, ip, lr} \n\ ldmia %1!, {r2 - r7, ip, lr} \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ stmia %0, {r2 - r7, ip, lr} \n\ ldmia %1!, {r2 - r7, ip, lr} \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ stmia %0, {r2 - r7, ip, lr} \n\ ldmia %1!, {r2 - r7, ip, lr} \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ stmia %0, {r2 - r7, ip, lr} \n\ ldmia %1!, {r2 - r7, ip, lr} \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ stmia %0, {r2 - r7, ip, lr} \n\ ldmia %1!, {r2 - r7, ip, lr} \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ stmia %0, {r2 - r7, ip, lr} \n\ ldmia %1!, {r2 - r7, ip, lr} \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ stmia %0, {r2 - r7, ip, lr} \n\ subs %2, %2, #(32 * 8) \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ bne 1b \n\ mcr p15, 0, %2, c7, c10, 4 @ drain WB" : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) : "2" (PAGE_SIZE) : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); } void feroceon_copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma) { void *kto, *kfrom; kto = kmap_atomic(to); kfrom = kmap_atomic(from); flush_cache_page(vma, vaddr, page_to_pfn(from)); feroceon_copy_user_page(kto, kfrom); kunmap_atomic(kfrom); kunmap_atomic(kto); } void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr) { void *ptr, *kaddr = kmap_atomic(page); asm volatile ("\ mov r1, %2 \n\ mov r2, #0 \n\ mov r3, #0 \n\ mov r4, #0 \n\ mov r5, #0 \n\ mov r6, #0 \n\ mov r7, #0 \n\ mov ip, #0 \n\ mov lr, #0 \n\ 1: stmia %0, {r2-r7, ip, lr} \n\ subs r1, r1, #1 \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ bne 1b \n\ mcr p15, 0, r1, c7, c10, 4 @ drain WB" : "=r" (ptr) : "0" (kaddr), "I" (PAGE_SIZE / 32) : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); kunmap_atomic(kaddr); } struct cpu_user_fns feroceon_user_fns __initdata = { .cpu_clear_user_highpage = feroceon_clear_user_highpage, .cpu_copy_user_highpage = feroceon_copy_user_highpage, }; |