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1/*
2 * linux/arch/arm/mm/copypage-v6.c
3 *
4 * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/init.h>
11#include <linux/spinlock.h>
12#include <linux/mm.h>
13#include <linux/highmem.h>
14
15#include <asm/pgtable.h>
16#include <asm/shmparam.h>
17#include <asm/tlbflush.h>
18#include <asm/cacheflush.h>
19#include <asm/cachetype.h>
20
21#include "mm.h"
22
23#if SHMLBA > 16384
24#error FIX ME
25#endif
26
27static DEFINE_RAW_SPINLOCK(v6_lock);
28
29/*
30 * Copy the user page. No aliasing to deal with so we can just
31 * attack the kernel's existing mapping of these pages.
32 */
33static void v6_copy_user_highpage_nonaliasing(struct page *to,
34 struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
35{
36 void *kto, *kfrom;
37
38 kfrom = kmap_atomic(from);
39 kto = kmap_atomic(to);
40 copy_page(kto, kfrom);
41 kunmap_atomic(kto);
42 kunmap_atomic(kfrom);
43}
44
45/*
46 * Clear the user page. No aliasing to deal with so we can just
47 * attack the kernel's existing mapping of this page.
48 */
49static void v6_clear_user_highpage_nonaliasing(struct page *page, unsigned long vaddr)
50{
51 void *kaddr = kmap_atomic(page);
52 clear_page(kaddr);
53 kunmap_atomic(kaddr);
54}
55
56/*
57 * Discard data in the kernel mapping for the new page.
58 * FIXME: needs this MCRR to be supported.
59 */
60static void discard_old_kernel_data(void *kto)
61{
62 __asm__("mcrr p15, 0, %1, %0, c6 @ 0xec401f06"
63 :
64 : "r" (kto),
65 "r" ((unsigned long)kto + PAGE_SIZE - 1)
66 : "cc");
67}
68
69/*
70 * Copy the page, taking account of the cache colour.
71 */
72static void v6_copy_user_highpage_aliasing(struct page *to,
73 struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
74{
75 unsigned int offset = CACHE_COLOUR(vaddr);
76 unsigned long kfrom, kto;
77
78 if (!test_and_set_bit(PG_dcache_clean, &from->flags))
79 __flush_dcache_page(page_mapping_file(from), from);
80
81 /* FIXME: not highmem safe */
82 discard_old_kernel_data(page_address(to));
83
84 /*
85 * Now copy the page using the same cache colour as the
86 * pages ultimate destination.
87 */
88 raw_spin_lock(&v6_lock);
89
90 kfrom = COPYPAGE_V6_FROM + (offset << PAGE_SHIFT);
91 kto = COPYPAGE_V6_TO + (offset << PAGE_SHIFT);
92
93 set_top_pte(kfrom, mk_pte(from, PAGE_KERNEL));
94 set_top_pte(kto, mk_pte(to, PAGE_KERNEL));
95
96 copy_page((void *)kto, (void *)kfrom);
97
98 raw_spin_unlock(&v6_lock);
99}
100
101/*
102 * Clear the user page. We need to deal with the aliasing issues,
103 * so remap the kernel page into the same cache colour as the user
104 * page.
105 */
106static void v6_clear_user_highpage_aliasing(struct page *page, unsigned long vaddr)
107{
108 unsigned long to = COPYPAGE_V6_TO + (CACHE_COLOUR(vaddr) << PAGE_SHIFT);
109
110 /* FIXME: not highmem safe */
111 discard_old_kernel_data(page_address(page));
112
113 /*
114 * Now clear the page using the same cache colour as
115 * the pages ultimate destination.
116 */
117 raw_spin_lock(&v6_lock);
118
119 set_top_pte(to, mk_pte(page, PAGE_KERNEL));
120 clear_page((void *)to);
121
122 raw_spin_unlock(&v6_lock);
123}
124
125struct cpu_user_fns v6_user_fns __initdata = {
126 .cpu_clear_user_highpage = v6_clear_user_highpage_nonaliasing,
127 .cpu_copy_user_highpage = v6_copy_user_highpage_nonaliasing,
128};
129
130static int __init v6_userpage_init(void)
131{
132 if (cache_is_vipt_aliasing()) {
133 cpu_user.cpu_clear_user_highpage = v6_clear_user_highpage_aliasing;
134 cpu_user.cpu_copy_user_highpage = v6_copy_user_highpage_aliasing;
135 }
136
137 return 0;
138}
139
140core_initcall(v6_userpage_init);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/mm/copypage-v6.c
4 *
5 * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
6 */
7#include <linux/init.h>
8#include <linux/spinlock.h>
9#include <linux/mm.h>
10#include <linux/highmem.h>
11
12#include <asm/pgtable.h>
13#include <asm/shmparam.h>
14#include <asm/tlbflush.h>
15#include <asm/cacheflush.h>
16#include <asm/cachetype.h>
17
18#include "mm.h"
19
20#if SHMLBA > 16384
21#error FIX ME
22#endif
23
24static DEFINE_RAW_SPINLOCK(v6_lock);
25
26/*
27 * Copy the user page. No aliasing to deal with so we can just
28 * attack the kernel's existing mapping of these pages.
29 */
30static void v6_copy_user_highpage_nonaliasing(struct page *to,
31 struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
32{
33 void *kto, *kfrom;
34
35 kfrom = kmap_atomic(from);
36 kto = kmap_atomic(to);
37 copy_page(kto, kfrom);
38 kunmap_atomic(kto);
39 kunmap_atomic(kfrom);
40}
41
42/*
43 * Clear the user page. No aliasing to deal with so we can just
44 * attack the kernel's existing mapping of this page.
45 */
46static void v6_clear_user_highpage_nonaliasing(struct page *page, unsigned long vaddr)
47{
48 void *kaddr = kmap_atomic(page);
49 clear_page(kaddr);
50 kunmap_atomic(kaddr);
51}
52
53/*
54 * Discard data in the kernel mapping for the new page.
55 * FIXME: needs this MCRR to be supported.
56 */
57static void discard_old_kernel_data(void *kto)
58{
59 __asm__("mcrr p15, 0, %1, %0, c6 @ 0xec401f06"
60 :
61 : "r" (kto),
62 "r" ((unsigned long)kto + PAGE_SIZE - 1)
63 : "cc");
64}
65
66/*
67 * Copy the page, taking account of the cache colour.
68 */
69static void v6_copy_user_highpage_aliasing(struct page *to,
70 struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
71{
72 unsigned int offset = CACHE_COLOUR(vaddr);
73 unsigned long kfrom, kto;
74
75 if (!test_and_set_bit(PG_dcache_clean, &from->flags))
76 __flush_dcache_page(page_mapping_file(from), from);
77
78 /* FIXME: not highmem safe */
79 discard_old_kernel_data(page_address(to));
80
81 /*
82 * Now copy the page using the same cache colour as the
83 * pages ultimate destination.
84 */
85 raw_spin_lock(&v6_lock);
86
87 kfrom = COPYPAGE_V6_FROM + (offset << PAGE_SHIFT);
88 kto = COPYPAGE_V6_TO + (offset << PAGE_SHIFT);
89
90 set_top_pte(kfrom, mk_pte(from, PAGE_KERNEL));
91 set_top_pte(kto, mk_pte(to, PAGE_KERNEL));
92
93 copy_page((void *)kto, (void *)kfrom);
94
95 raw_spin_unlock(&v6_lock);
96}
97
98/*
99 * Clear the user page. We need to deal with the aliasing issues,
100 * so remap the kernel page into the same cache colour as the user
101 * page.
102 */
103static void v6_clear_user_highpage_aliasing(struct page *page, unsigned long vaddr)
104{
105 unsigned long to = COPYPAGE_V6_TO + (CACHE_COLOUR(vaddr) << PAGE_SHIFT);
106
107 /* FIXME: not highmem safe */
108 discard_old_kernel_data(page_address(page));
109
110 /*
111 * Now clear the page using the same cache colour as
112 * the pages ultimate destination.
113 */
114 raw_spin_lock(&v6_lock);
115
116 set_top_pte(to, mk_pte(page, PAGE_KERNEL));
117 clear_page((void *)to);
118
119 raw_spin_unlock(&v6_lock);
120}
121
122struct cpu_user_fns v6_user_fns __initdata = {
123 .cpu_clear_user_highpage = v6_clear_user_highpage_nonaliasing,
124 .cpu_copy_user_highpage = v6_copy_user_highpage_nonaliasing,
125};
126
127static int __init v6_userpage_init(void)
128{
129 if (cache_is_vipt_aliasing()) {
130 cpu_user.cpu_clear_user_highpage = v6_clear_user_highpage_aliasing;
131 cpu_user.cpu_copy_user_highpage = v6_copy_user_highpage_aliasing;
132 }
133
134 return 0;
135}
136
137core_initcall(v6_userpage_init);