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 ("\
181:	ldmia	%1!, {r2 - r7, ip, lr}		\n\
19	pld	[%1, #0]			\n\
20	pld	[%1, #32]			\n\
21	pld	[%1, #64]			\n\
22	pld	[%1, #96]			\n\
23	pld	[%1, #128]			\n\
24	pld	[%1, #160]			\n\
25	pld	[%1, #192]			\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\
29	add	%0, %0, #32			\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\
33	add	%0, %0, #32			\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\
37	add	%0, %0, #32			\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\
41	add	%0, %0, #32			\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\
45	add	%0, %0, #32			\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\
49	add	%0, %0, #32			\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\
53	add	%0, %0, #32			\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\
57	add	%0, %0, #32			\n\
58	bne	1b				\n\
59	mcr	p15, 0, %2, c7, c10, 4		@ drain WB"
60	: "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
61	: "2" (PAGE_SIZE)
62	: "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
63}
64
65void feroceon_copy_user_highpage(struct page *to, struct page *from,
66	unsigned long vaddr, struct vm_area_struct *vma)
67{
68	void *kto, *kfrom;
69
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);
74	kunmap_atomic(kfrom);
75	kunmap_atomic(kto);
76}
77
78void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
79{
80	void *ptr, *kaddr = kmap_atomic(page);
81	asm volatile ("\
82	mov	r1, %2				\n\
83	mov	r2, #0				\n\
84	mov	r3, #0				\n\
85	mov	r4, #0				\n\
86	mov	r5, #0				\n\
87	mov	r6, #0				\n\
88	mov	r7, #0				\n\
89	mov	ip, #0				\n\
90	mov	lr, #0				\n\
911:	stmia	%0, {r2-r7, ip, lr}		\n\
92	subs	r1, r1, #1			\n\
93	mcr	p15, 0, %0, c7, c14, 1		@ clean and invalidate D line\n\
94	add	%0, %0, #32			\n\
95	bne	1b				\n\
96	mcr	p15, 0, r1, c7, c10, 4		@ drain WB"
97	: "=r" (ptr)
98	: "0" (kaddr), "I" (PAGE_SIZE / 32)
99	: "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
100	kunmap_atomic(kaddr);
101}
102
103struct 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,
106};
107
108