summaryrefslogtreecommitdiff
path: root/arch/mips/include/asm/page.h
blob: e2f503fc7a847d48130bb60217fb998dd1447a6c (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
/*
 * 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) 1994 - 1999, 2000, 03 Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 */
#ifndef _ASM_PAGE_H
#define _ASM_PAGE_H

#include <spaces.h>
#include <linux/const.h>
#include <linux/kernel.h>
#include <asm/mipsregs.h>

/*
 * PAGE_SHIFT determines the page size
 */
#ifdef CONFIG_PAGE_SIZE_4KB
#define PAGE_SHIFT	12
#endif
#ifdef CONFIG_PAGE_SIZE_8KB
#define PAGE_SHIFT	13
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
#define PAGE_SHIFT	14
#endif
#ifdef CONFIG_PAGE_SIZE_32KB
#define PAGE_SHIFT	15
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
#define PAGE_SHIFT	16
#endif
#define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK	(~((1 << PAGE_SHIFT) - 1))

/*
 * This is used for calculating the real page sizes
 * for FTLB or VTLB + FTLB configurations.
 */
static inline unsigned int page_size_ftlb(unsigned int mmuextdef)
{
	switch (mmuextdef) {
	case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
		if (PAGE_SIZE == (1 << 30))
			return 5;
		if (PAGE_SIZE == (1llu << 32))
			return 6;
		if (PAGE_SIZE > (256 << 10))
			return 7; /* reserved */
			/* fall through */
	case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
		return (PAGE_SHIFT - 10) / 2;
	default:
		panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n",
		      mmuextdef >> 14);
	}
}

#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
#define HPAGE_SHIFT	(PAGE_SHIFT + PAGE_SHIFT - 3)
#define HPAGE_SIZE	(_AC(1,UL) << HPAGE_SHIFT)
#define HPAGE_MASK	(~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */
#define HPAGE_SHIFT	({BUILD_BUG(); 0; })
#define HPAGE_SIZE	({BUILD_BUG(); 0; })
#define HPAGE_MASK	({BUILD_BUG(); 0; })
#define HUGETLB_PAGE_ORDER	({BUILD_BUG(); 0; })
#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */

#include <linux/pfn.h>

extern void build_clear_page(void);
extern void build_copy_page(void);

/*
 * It's normally defined only for FLATMEM config but it's
 * used in our early mem init code for all memory models.
 * So always define it.
 */
#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
extern unsigned long ARCH_PFN_OFFSET;
# define ARCH_PFN_OFFSET	ARCH_PFN_OFFSET
#else
# define ARCH_PFN_OFFSET	PFN_UP(PHYS_OFFSET)
#endif

extern void clear_page(void * page);
extern void copy_page(void * to, void * from);

extern unsigned long shm_align_mask;

static inline unsigned long pages_do_alias(unsigned long addr1,
	unsigned long addr2)
{
	return (addr1 ^ addr2) & shm_align_mask;
}

struct page;

static inline void clear_user_page(void *addr, unsigned long vaddr,
	struct page *page)
{
	extern void (*flush_data_cache_page)(unsigned long addr);

	clear_page(addr);
	if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
		flush_data_cache_page((unsigned long)addr);
}

struct vm_area_struct;
extern void copy_user_highpage(struct page *to, struct page *from,
	unsigned long vaddr, struct vm_area_struct *vma);

#define __HAVE_ARCH_COPY_USER_HIGHPAGE

/*
 * These are used to make use of C type-checking..
 */
#ifdef CONFIG_PHYS_ADDR_T_64BIT
  #ifdef CONFIG_CPU_MIPS32
    typedef struct { unsigned long pte_low, pte_high; } pte_t;
    #define pte_val(x)	  ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
    #define __pte(x)	  ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  #else
     typedef struct { unsigned long long pte; } pte_t;
     #define pte_val(x) ((x).pte)
     #define __pte(x)	((pte_t) { (x) } )
  #endif
#else
typedef struct { unsigned long pte; } pte_t;
#define pte_val(x)	((x).pte)
#define __pte(x)	((pte_t) { (x) } )
#endif
typedef struct page *pgtable_t;

/*
 * Right now we don't support 4-level pagetables, so all pud-related
 * definitions come from <asm-generic/pgtable-nopud.h>.
 */

/*
 * Finall the top of the hierarchy, the pgd
 */
typedef struct { unsigned long pgd; } pgd_t;
#define pgd_val(x)	((x).pgd)
#define __pgd(x)	((pgd_t) { (x) } )

/*
 * Manipulate page protection bits
 */
typedef struct { unsigned long pgprot; } pgprot_t;
#define pgprot_val(x)	((x).pgprot)
#define __pgprot(x)	((pgprot_t) { (x) } )
#define pte_pgprot(x)	__pgprot(pte_val(x) & ~_PFN_MASK)

/*
 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 * pair of pages we only have a single global bit per pair of pages.  When
 * writing to the TLB make sure we always have the bit set for both pages
 * or none.  This macro is used to access the `buddy' of the pte we're just
 * working on.
 */
#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))

/*
 * __pa()/__va() should be used only during mem init.
 */
static inline unsigned long ___pa(unsigned long x)
{
	if (IS_ENABLED(CONFIG_64BIT)) {
		/*
		 * For MIPS64 the virtual address may either be in one of
		 * the compatibility segements ckseg0 or ckseg1, or it may
		 * be in xkphys.
		 */
		return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x);
	}

	if (!IS_ENABLED(CONFIG_EVA)) {
		/*
		 * We're using the standard MIPS32 legacy memory map, ie.
		 * the address x is going to be in kseg0 or kseg1. We can
		 * handle either case by masking out the desired bits using
		 * CPHYSADDR.
		 */
		return CPHYSADDR(x);
	}

	/*
	 * EVA is in use so the memory map could be anything, making it not
	 * safe to just mask out bits.
	 */
	return x - PAGE_OFFSET + PHYS_OFFSET;
}
#define __pa(x)		___pa((unsigned long)(x))
#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
#include <asm/io.h>

/*
 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org).  The
 * discussion can be found in lkml posting
 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
 *
 * It is unclear if the misscompilations mentioned in
 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
 * until GCC 3.x has been retired before we can apply
 * https://patchwork.linux-mips.org/patch/1541/
 */

#ifndef __pa_symbol
#define __pa_symbol(x)	__pa(RELOC_HIDE((unsigned long)(x), 0))
#endif

#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

#ifdef CONFIG_FLATMEM

static inline int pfn_valid(unsigned long pfn)
{
	/* avoid <linux/mm.h> include hell */
	extern unsigned long max_mapnr;
	unsigned long pfn_offset = ARCH_PFN_OFFSET;

	return pfn >= pfn_offset && pfn < max_mapnr;
}

#elif defined(CONFIG_SPARSEMEM)

/* pfn_valid is defined in linux/mmzone.h */

#elif defined(CONFIG_NEED_MULTIPLE_NODES)

#define pfn_valid(pfn)							\
({									\
	unsigned long __pfn = (pfn);					\
	int __n = pfn_to_nid(__pfn);					\
	((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +		\
			       NODE_DATA(__n)->node_spanned_pages)	\
		    : 0);						\
})

#endif

#define virt_to_pfn(kaddr)   	PFN_DOWN(virt_to_phys((void *)(kaddr)))
#define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))

extern bool __virt_addr_valid(const volatile void *kaddr);
#define virt_addr_valid(kaddr)						\
	__virt_addr_valid((const volatile void *) (kaddr))

#define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_TSK_EXEC

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* _ASM_PAGE_H */