1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/arch/arm/lib/copypage-fa.S |
4 | * |
5 | * Copyright (C) 2005 Faraday Corp. |
6 | * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> |
7 | * |
8 | * Based on copypage-v4wb.S: |
9 | * Copyright (C) 1995-1999 Russell King |
10 | */ |
11 | #include <linux/init.h> |
12 | #include <linux/highmem.h> |
13 | |
14 | /* |
15 | * Faraday optimised copy_user_page |
16 | */ |
17 | static void fa_copy_user_page(void *kto, const void *kfrom) |
18 | { |
19 | int tmp; |
20 | |
21 | asm volatile ("\ |
22 | 1: ldmia %1!, {r3, r4, ip, lr} @ 4\n\ |
23 | stmia %0, {r3, r4, ip, lr} @ 4\n\ |
24 | mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ |
25 | add %0, %0, #16 @ 1\n\ |
26 | ldmia %1!, {r3, r4, ip, lr} @ 4\n\ |
27 | stmia %0, {r3, r4, ip, lr} @ 4\n\ |
28 | mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ |
29 | add %0, %0, #16 @ 1\n\ |
30 | subs %2, %2, #1 @ 1\n\ |
31 | bne 1b @ 1\n\ |
32 | mcr p15, 0, %2, c7, c10, 4 @ 1 drain WB" |
33 | : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) |
34 | : "2" (PAGE_SIZE / 32) |
35 | : "r3" , "r4" , "ip" , "lr" ); |
36 | } |
37 | |
38 | void fa_copy_user_highpage(struct page *to, struct page *from, |
39 | unsigned long vaddr, struct vm_area_struct *vma) |
40 | { |
41 | void *kto, *kfrom; |
42 | |
43 | kto = kmap_atomic(page: to); |
44 | kfrom = kmap_atomic(page: from); |
45 | fa_copy_user_page(kto, kfrom); |
46 | kunmap_atomic(kfrom); |
47 | kunmap_atomic(kto); |
48 | } |
49 | |
50 | /* |
51 | * Faraday optimised clear_user_page |
52 | * |
53 | * Same story as above. |
54 | */ |
55 | void fa_clear_user_highpage(struct page *page, unsigned long vaddr) |
56 | { |
57 | void *ptr, *kaddr = kmap_atomic(page); |
58 | asm volatile("\ |
59 | mov r1, %2 @ 1\n\ |
60 | mov r2, #0 @ 1\n\ |
61 | mov r3, #0 @ 1\n\ |
62 | mov ip, #0 @ 1\n\ |
63 | mov lr, #0 @ 1\n\ |
64 | 1: stmia %0, {r2, r3, ip, lr} @ 4\n\ |
65 | mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ |
66 | add %0, %0, #16 @ 1\n\ |
67 | stmia %0, {r2, r3, ip, lr} @ 4\n\ |
68 | mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ |
69 | add %0, %0, #16 @ 1\n\ |
70 | subs r1, r1, #1 @ 1\n\ |
71 | bne 1b @ 1\n\ |
72 | mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB" |
73 | : "=r" (ptr) |
74 | : "0" (kaddr), "I" (PAGE_SIZE / 32) |
75 | : "r1" , "r2" , "r3" , "ip" , "lr" ); |
76 | kunmap_atomic(kaddr); |
77 | } |
78 | |
79 | struct cpu_user_fns fa_user_fns __initdata = { |
80 | .cpu_clear_user_highpage = fa_clear_user_highpage, |
81 | .cpu_copy_user_highpage = fa_copy_user_highpage, |
82 | }; |
83 | |