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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
27#define from_address (0xffff8000)
28#define to_address (0xffffc000)
29
30static DEFINE_SPINLOCK(v6_lock);
31
32/*
33 * Copy the user page. No aliasing to deal with so we can just
34 * attack the kernel's existing mapping of these pages.
35 */
36static void v6_copy_user_highpage_nonaliasing(struct page *to,
37 struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
38{
39 void *kto, *kfrom;
40
41 kfrom = kmap_atomic(from, KM_USER0);
42 kto = kmap_atomic(to, KM_USER1);
43 copy_page(kto, kfrom);
44 kunmap_atomic(kto, KM_USER1);
45 kunmap_atomic(kfrom, KM_USER0);
46}
47
48/*
49 * Clear the user page. No aliasing to deal with so we can just
50 * attack the kernel's existing mapping of this page.
51 */
52static void v6_clear_user_highpage_nonaliasing(struct page *page, unsigned long vaddr)
53{
54 void *kaddr = kmap_atomic(page, KM_USER0);
55 clear_page(kaddr);
56 kunmap_atomic(kaddr, KM_USER0);
57}
58
59/*
60 * Discard data in the kernel mapping for the new page.
61 * FIXME: needs this MCRR to be supported.
62 */
63static void discard_old_kernel_data(void *kto)
64{
65 __asm__("mcrr p15, 0, %1, %0, c6 @ 0xec401f06"
66 :
67 : "r" (kto),
68 "r" ((unsigned long)kto + PAGE_SIZE - L1_CACHE_BYTES)
69 : "cc");
70}
71
72/*
73 * Copy the page, taking account of the cache colour.
74 */
75static void v6_copy_user_highpage_aliasing(struct page *to,
76 struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
77{
78 unsigned int offset = CACHE_COLOUR(vaddr);
79 unsigned long kfrom, kto;
80
81 if (!test_and_set_bit(PG_dcache_clean, &from->flags))
82 __flush_dcache_page(page_mapping(from), from);
83
84 /* FIXME: not highmem safe */
85 discard_old_kernel_data(page_address(to));
86
87 /*
88 * Now copy the page using the same cache colour as the
89 * pages ultimate destination.
90 */
91 spin_lock(&v6_lock);
92
93 set_pte_ext(TOP_PTE(from_address) + offset, pfn_pte(page_to_pfn(from), PAGE_KERNEL), 0);
94 set_pte_ext(TOP_PTE(to_address) + offset, pfn_pte(page_to_pfn(to), PAGE_KERNEL), 0);
95
96 kfrom = from_address + (offset << PAGE_SHIFT);
97 kto = to_address + (offset << PAGE_SHIFT);
98
99 flush_tlb_kernel_page(kfrom);
100 flush_tlb_kernel_page(kto);
101
102 copy_page((void *)kto, (void *)kfrom);
103
104 spin_unlock(&v6_lock);
105}
106
107/*
108 * Clear the user page. We need to deal with the aliasing issues,
109 * so remap the kernel page into the same cache colour as the user
110 * page.
111 */
112static void v6_clear_user_highpage_aliasing(struct page *page, unsigned long vaddr)
113{
114 unsigned int offset = CACHE_COLOUR(vaddr);
115 unsigned long to = to_address + (offset << PAGE_SHIFT);
116
117 /* FIXME: not highmem safe */
118 discard_old_kernel_data(page_address(page));
119
120 /*
121 * Now clear the page using the same cache colour as
122 * the pages ultimate destination.
123 */
124 spin_lock(&v6_lock);
125
126 set_pte_ext(TOP_PTE(to_address) + offset, pfn_pte(page_to_pfn(page), PAGE_KERNEL), 0);
127 flush_tlb_kernel_page(to);
128 clear_page((void *)to);
129
130 spin_unlock(&v6_lock);
131}
132
133struct cpu_user_fns v6_user_fns __initdata = {
134 .cpu_clear_user_highpage = v6_clear_user_highpage_nonaliasing,
135 .cpu_copy_user_highpage = v6_copy_user_highpage_nonaliasing,
136};
137
138static int __init v6_userpage_init(void)
139{
140 if (cache_is_vipt_aliasing()) {
141 cpu_user.cpu_clear_user_highpage = v6_clear_user_highpage_aliasing;
142 cpu_user.cpu_copy_user_highpage = v6_copy_user_highpage_aliasing;
143 }
144
145 return 0;
146}
147
148core_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/shmparam.h>
13#include <asm/tlbflush.h>
14#include <asm/cacheflush.h>
15#include <asm/cachetype.h>
16
17#include "mm.h"
18
19#if SHMLBA > 16384
20#error FIX ME
21#endif
22
23static DEFINE_RAW_SPINLOCK(v6_lock);
24
25/*
26 * Copy the user page. No aliasing to deal with so we can just
27 * attack the kernel's existing mapping of these pages.
28 */
29static void v6_copy_user_highpage_nonaliasing(struct page *to,
30 struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
31{
32 void *kto, *kfrom;
33
34 kfrom = kmap_atomic(from);
35 kto = kmap_atomic(to);
36 copy_page(kto, kfrom);
37 kunmap_atomic(kto);
38 kunmap_atomic(kfrom);
39}
40
41/*
42 * Clear the user page. No aliasing to deal with so we can just
43 * attack the kernel's existing mapping of this page.
44 */
45static void v6_clear_user_highpage_nonaliasing(struct page *page, unsigned long vaddr)
46{
47 void *kaddr = kmap_atomic(page);
48 clear_page(kaddr);
49 kunmap_atomic(kaddr);
50}
51
52/*
53 * Discard data in the kernel mapping for the new page.
54 * FIXME: needs this MCRR to be supported.
55 */
56static void discard_old_kernel_data(void *kto)
57{
58 __asm__("mcrr p15, 0, %1, %0, c6 @ 0xec401f06"
59 :
60 : "r" (kto),
61 "r" ((unsigned long)kto + PAGE_SIZE - 1)
62 : "cc");
63}
64
65/*
66 * Copy the page, taking account of the cache colour.
67 */
68static void v6_copy_user_highpage_aliasing(struct page *to,
69 struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
70{
71 unsigned int offset = CACHE_COLOUR(vaddr);
72 unsigned long kfrom, kto;
73
74 if (!test_and_set_bit(PG_dcache_clean, &from->flags))
75 __flush_dcache_page(page_mapping_file(from), from);
76
77 /* FIXME: not highmem safe */
78 discard_old_kernel_data(page_address(to));
79
80 /*
81 * Now copy the page using the same cache colour as the
82 * pages ultimate destination.
83 */
84 raw_spin_lock(&v6_lock);
85
86 kfrom = COPYPAGE_V6_FROM + (offset << PAGE_SHIFT);
87 kto = COPYPAGE_V6_TO + (offset << PAGE_SHIFT);
88
89 set_top_pte(kfrom, mk_pte(from, PAGE_KERNEL));
90 set_top_pte(kto, mk_pte(to, PAGE_KERNEL));
91
92 copy_page((void *)kto, (void *)kfrom);
93
94 raw_spin_unlock(&v6_lock);
95}
96
97/*
98 * Clear the user page. We need to deal with the aliasing issues,
99 * so remap the kernel page into the same cache colour as the user
100 * page.
101 */
102static void v6_clear_user_highpage_aliasing(struct page *page, unsigned long vaddr)
103{
104 unsigned long to = COPYPAGE_V6_TO + (CACHE_COLOUR(vaddr) << PAGE_SHIFT);
105
106 /* FIXME: not highmem safe */
107 discard_old_kernel_data(page_address(page));
108
109 /*
110 * Now clear the page using the same cache colour as
111 * the pages ultimate destination.
112 */
113 raw_spin_lock(&v6_lock);
114
115 set_top_pte(to, mk_pte(page, PAGE_KERNEL));
116 clear_page((void *)to);
117
118 raw_spin_unlock(&v6_lock);
119}
120
121struct cpu_user_fns v6_user_fns __initdata = {
122 .cpu_clear_user_highpage = v6_clear_user_highpage_nonaliasing,
123 .cpu_copy_user_highpage = v6_copy_user_highpage_nonaliasing,
124};
125
126static int __init v6_userpage_init(void)
127{
128 if (cache_is_vipt_aliasing()) {
129 cpu_user.cpu_clear_user_highpage = v6_clear_user_highpage_aliasing;
130 cpu_user.cpu_copy_user_highpage = v6_copy_user_highpage_aliasing;
131 }
132
133 return 0;
134}
135
136core_initcall(v6_userpage_init);