1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/arch/arm/mm/copypage-feroceon.S
5 * Copyright (C) 2008 Marvell Semiconductors
7 * This handles copy_user_highpage and clear_user_page on Feroceon
8 * more optimally than the generic implementations.
10 #include <linux/init.h>
11 #include <linux/highmem.h>
13 static void feroceon_copy_user_page(void *kto, const void *kfrom)
18 1: ldmia %1!, {r2 - r7, ip, lr} \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\
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\
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\
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\
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\
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\
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\
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\
59 mcr p15, 0, %2, c7, c10, 4 @ drain WB"
60 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
62 : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
65 void feroceon_copy_user_highpage(struct page *to, struct page *from,
66 unsigned long vaddr, struct vm_area_struct *vma)
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);
78 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
80 void *ptr, *kaddr = kmap_atomic(page);
91 1: stmia %0, {r2-r7, ip, lr} \n\
93 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
96 mcr p15, 0, r1, c7, c10, 4 @ drain WB"
98 : "0" (kaddr), "I" (PAGE_SIZE / 32)
99 : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
100 kunmap_atomic(kaddr);
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,