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 .arch armv5te \n\
19 1: ldmia %1!, {r2 - r7, ip, lr} \n\
20 pld [%1, #0] \n\
21 pld [%1, #32] \n\
22 pld [%1, #64] \n\
23 pld [%1, #96] \n\
24 pld [%1, #128] \n\
25 pld [%1, #160] \n\
26 pld [%1, #192] \n\
27 stmia %0, {r2 - r7, ip, lr} \n\
28 ldmia %1!, {r2 - r7, ip, lr} \n\
29 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
30 add %0, %0, #32 \n\
31 stmia %0, {r2 - r7, ip, lr} \n\
32 ldmia %1!, {r2 - r7, ip, lr} \n\
33 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
34 add %0, %0, #32 \n\
35 stmia %0, {r2 - r7, ip, lr} \n\
36 ldmia %1!, {r2 - r7, ip, lr} \n\
37 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
38 add %0, %0, #32 \n\
39 stmia %0, {r2 - r7, ip, lr} \n\
40 ldmia %1!, {r2 - r7, ip, lr} \n\
41 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
42 add %0, %0, #32 \n\
43 stmia %0, {r2 - r7, ip, lr} \n\
44 ldmia %1!, {r2 - r7, ip, lr} \n\
45 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
46 add %0, %0, #32 \n\
47 stmia %0, {r2 - r7, ip, lr} \n\
48 ldmia %1!, {r2 - r7, ip, lr} \n\
49 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
50 add %0, %0, #32 \n\
51 stmia %0, {r2 - r7, ip, lr} \n\
52 ldmia %1!, {r2 - r7, ip, lr} \n\
53 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
54 add %0, %0, #32 \n\
55 stmia %0, {r2 - r7, ip, lr} \n\
56 subs %2, %2, #(32 * 8) \n\
57 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
58 add %0, %0, #32 \n\
59 bne 1b \n\
60 mcr p15, 0, %2, c7, c10, 4 @ drain WB"
61 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
62 : "2" (PAGE_SIZE)
63 : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
64 }
65
66 void feroceon_copy_user_highpage(struct page *to, struct page *from,
67 unsigned long vaddr, struct vm_area_struct *vma)
68 {
69 void *kto, *kfrom;
70
71 kto = kmap_atomic(to);
72 kfrom = kmap_atomic(from);
73 flush_cache_page(vma, vaddr, page_to_pfn(from));
74 feroceon_copy_user_page(kto, kfrom);
75 kunmap_atomic(kfrom);
76 kunmap_atomic(kto);
77 }
78
79 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
80 {
81 void *ptr, *kaddr = kmap_atomic(page);
82 asm volatile ("\
83 mov r1, %2 \n\
84 mov r2, #0 \n\
85 mov r3, #0 \n\
86 mov r4, #0 \n\
87 mov r5, #0 \n\
88 mov r6, #0 \n\
89 mov r7, #0 \n\
90 mov ip, #0 \n\
91 mov lr, #0 \n\
92 1: stmia %0, {r2-r7, ip, lr} \n\
93 subs r1, r1, #1 \n\
94 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
95 add %0, %0, #32 \n\
96 bne 1b \n\
97 mcr p15, 0, r1, c7, c10, 4 @ drain WB"
98 : "=r" (ptr)
99 : "" (kaddr), "I" (PAGE_SIZE / 32)
100 : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
101 kunmap_atomic(kaddr);
102 }
103
104 struct cpu_user_fns feroceon_user_fns __initdata = {
105 .cpu_clear_user_highpage = feroceon_clear_user_highpage,
106 .cpu_copy_user_highpage = feroceon_copy_user_highpage,
107 };
108
109
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