xref: /openbmc/linux/arch/arm/mm/copypage-feroceon.c (revision a2faac39)
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 
feroceon_copy_user_page(void * kto,const void * kfrom)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 
feroceon_copy_user_highpage(struct page * to,struct page * from,unsigned long vaddr,struct vm_area_struct * vma)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 
feroceon_clear_user_highpage(struct page * page,unsigned long vaddr)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 	: "0" (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