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
13static void feroceon_copy_user_page(void *kto, const void *kfrom)
14{
15	int tmp;
16
17	asm volatile ("\
18.arch	armv5te					\n\
191:	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
66void 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
79void 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\
921:	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	: "0" (kaddr), "I" (PAGE_SIZE / 32)
100	: "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
101	kunmap_atomic(kaddr);
102}
103
104struct 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