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 */
17static void fa_copy_user_page(void *kto, const void *kfrom)
18{
19	int tmp;
20
21	asm volatile ("\
221:	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
38void 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(to);
44	kfrom = kmap_atomic(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 */
55void 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\
641:	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
79struct 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