summaryrefslogtreecommitdiffstats
path: root/arch/nios2/mm/cacheflush.c
blob: 223cdcc8203f566483c15051c1ce5cfdfe608791 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2009, Wind River Systems Inc
 * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
 */

#include <linux/export.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fs.h>

#include <asm/cacheflush.h>
#include <asm/cpuinfo.h>

static void __flush_dcache(unsigned long start, unsigned long end)
{
	unsigned long addr;

	start &= ~(cpuinfo.dcache_line_size - 1);
	end += (cpuinfo.dcache_line_size - 1);
	end &= ~(cpuinfo.dcache_line_size - 1);

	for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
		__asm__ __volatile__ ("   flushda 0(%0)\n"
					: /* Outputs */
					: /* Inputs  */ "r"(addr)
					/* : No clobber */);
	}
}

static void __flush_dcache_all(unsigned long start, unsigned long end)
{
	unsigned long addr;

	start &= ~(cpuinfo.dcache_line_size - 1);
	end += (cpuinfo.dcache_line_size - 1);
	end &= ~(cpuinfo.dcache_line_size - 1);

	if (end > start + cpuinfo.dcache_size)
		end = start + cpuinfo.dcache_size;

	for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
		__asm__ __volatile__ ("   flushd 0(%0)\n"
					: /* Outputs */
					: /* Inputs  */ "r"(addr)
					/* : No clobber */);
	}
}

static void __invalidate_dcache(unsigned long start, unsigned long end)
{
	unsigned long addr;

	start &= ~(cpuinfo.dcache_line_size - 1);
	end += (cpuinfo.dcache_line_size - 1);
	end &= ~(cpuinfo.dcache_line_size - 1);

	for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {
		__asm__ __volatile__ ("   initda 0(%0)\n"
					: /* Outputs */
					: /* Inputs  */ "r"(addr)
					/* : No clobber */);
	}
}

static void __flush_icache(unsigned long start, unsigned long end)
{
	unsigned long addr;

	start &= ~(cpuinfo.icache_line_size - 1);
	end += (cpuinfo.icache_line_size - 1);
	end &= ~(cpuinfo.icache_line_size - 1);

	if (end > start + cpuinfo.icache_size)
		end = start + cpuinfo.icache_size;

	for (addr = start; addr < end; addr += cpuinfo.icache_line_size) {
		__asm__ __volatile__ ("   flushi %0\n"
					: /* Outputs */
					: /* Inputs  */ "r"(addr)
					/* : No clobber */);
	}
	__asm__ __volatile(" flushp\n");
}

static void flush_aliases(struct address_space *mapping, struct page *page)
{
	struct mm_struct *mm = current->active_mm;
	struct vm_area_struct *mpnt;
	pgoff_t pgoff;

	pgoff = page->index;

	flush_dcache_mmap_lock(mapping);
	vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
		unsigned long offset;

		if (mpnt->vm_mm != mm)
			continue;
		if (!(mpnt->vm_flags & VM_MAYSHARE))
			continue;

		offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
		flush_cache_page(mpnt, mpnt->vm_start + offset,
			page_to_pfn(page));
	}
	flush_dcache_mmap_unlock(mapping);
}

void flush_cache_all(void)
{
	__flush_dcache_all(0, cpuinfo.dcache_size);
	__flush_icache(0, cpuinfo.icache_size);
}

void flush_cache_mm(struct mm_struct *mm)
{
	flush_cache_all();
}

void flush_cache_dup_mm(struct mm_struct *mm)
{
	flush_cache_all();
}

void flush_icache_range(unsigned long start, unsigned long end)
{
	__flush_dcache(start, end);
	__flush_icache(start, end);
}

void flush_dcache_range(unsigned long start, unsigned long end)
{
	__flush_dcache(start, end);
	__flush_icache(start, end);
}
EXPORT_SYMBOL(flush_dcache_range);

void invalidate_dcache_range(unsigned long start, unsigned long end)
{
	__invalidate_dcache(start, end);
}
EXPORT_SYMBOL(invalidate_dcache_range);

void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
			unsigned long end)
{
	__flush_dcache(start, end);
	if (vma == NULL || (vma->vm_flags & VM_EXEC))
		__flush_icache(start, end);
}

void flush_icache_page(struct vm_area_struct *vma, struct page *page)
{
	unsigned long start = (unsigned long) page_address(page);
	unsigned long end = start + PAGE_SIZE;

	__flush_dcache(start, end);
	__flush_icache(start, end);
}

void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
			unsigned long pfn)
{
	unsigned long start = vmaddr;
	unsigned long end = start + PAGE_SIZE;

	__flush_dcache(start, end);
	if (vma->vm_flags & VM_EXEC)
		__flush_icache(start, end);
}

void __flush_dcache_page(struct address_space *mapping, struct page *page)
{
	/*
	 * Writeback any data associated with the kernel mapping of this
	 * page.  This ensures that data in the physical page is mutually
	 * coherent with the kernels mapping.
	 */
	unsigned long start = (unsigned long)page_address(page);

	__flush_dcache_all(start, start + PAGE_SIZE);
}

void flush_dcache_page(struct page *page)
{
	struct address_space *mapping;

	/*
	 * The zero page is never written to, so never has any dirty
	 * cache lines, and therefore never needs to be flushed.
	 */
	if (page == ZERO_PAGE(0))
		return;

	mapping = page_mapping(page);

	/* Flush this page if there are aliases. */
	if (mapping && !mapping_mapped(mapping)) {
		clear_bit(PG_dcache_clean, &page->flags);
	} else {
		__flush_dcache_page(mapping, page);
		if (mapping) {
			unsigned long start = (unsigned long)page_address(page);
			flush_aliases(mapping,  page);
			flush_icache_range(start, start + PAGE_SIZE);
		}
		set_bit(PG_dcache_clean, &page->flags);
	}
}
EXPORT_SYMBOL(flush_dcache_page);

void update_mmu_cache(struct vm_area_struct *vma,
		      unsigned long address, pte_t *pte)
{
	unsigned long pfn = pte_pfn(*pte);
	struct page *page;
	struct address_space *mapping;

	if (!pfn_valid(pfn))
		return;

	/*
	* The zero page is never written to, so never has any dirty
	* cache lines, and therefore never needs to be flushed.
	*/
	page = pfn_to_page(pfn);
	if (page == ZERO_PAGE(0))
		return;

	mapping = page_mapping(page);
	if (!test_and_set_bit(PG_dcache_clean, &page->flags))
		__flush_dcache_page(mapping, page);

	if(mapping)
	{
		flush_aliases(mapping, page);
		if (vma->vm_flags & VM_EXEC)
			flush_icache_page(vma, page);
	}
}

void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
		    struct page *to)
{
	__flush_dcache(vaddr, vaddr + PAGE_SIZE);
	__flush_icache(vaddr, vaddr + PAGE_SIZE);
	copy_page(vto, vfrom);
	__flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
	__flush_icache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
}

void clear_user_page(void *addr, unsigned long vaddr, struct page *page)
{
	__flush_dcache(vaddr, vaddr + PAGE_SIZE);
	__flush_icache(vaddr, vaddr + PAGE_SIZE);
	clear_page(addr);
	__flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
	__flush_icache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
}

void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
			unsigned long user_vaddr,
			void *dst, void *src, int len)
{
	flush_cache_page(vma, user_vaddr, page_to_pfn(page));
	memcpy(dst, src, len);
	__flush_dcache_all((unsigned long)src, (unsigned long)src + len);
	if (vma->vm_flags & VM_EXEC)
		__flush_icache((unsigned long)src, (unsigned long)src + len);
}

void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
			unsigned long user_vaddr,
			void *dst, void *src, int len)
{
	flush_cache_page(vma, user_vaddr, page_to_pfn(page));
	memcpy(dst, src, len);
	__flush_dcache_all((unsigned long)dst, (unsigned long)dst + len);
	if (vma->vm_flags & VM_EXEC)
		__flush_icache((unsigned long)dst, (unsigned long)dst + len);
}