summaryrefslogtreecommitdiffstats
path: root/arch/parisc/include/asm/page.h
blob: 93caf17ac5e2ff20268cd47e538f691ee5edd721 (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
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PARISC_PAGE_H
#define _PARISC_PAGE_H

#include <linux/const.h>

#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
# define PAGE_SHIFT	12
#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
# define PAGE_SHIFT	14
#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
# define PAGE_SHIFT	16
#else
# error "unknown default kernel page size"
#endif
#define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))


#ifndef __ASSEMBLY__

#include <asm/types.h>
#include <asm/cache.h>

#define clear_page(page)	clear_page_asm((void *)(page))
#define copy_page(to, from)	copy_page_asm((void *)(to), (void *)(from))

struct page;

void clear_page_asm(void *page);
void copy_page_asm(void *to, void *from);
#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
			struct page *pg);

/*
 * These are used to make use of C type-checking..
 */
#define STRICT_MM_TYPECHECKS
#ifdef STRICT_MM_TYPECHECKS
typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */

/* NOTE: even on 64 bits, these entries are __u32 because we allocate
 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
typedef struct { __u32 pmd; } pmd_t;
typedef struct { __u32 pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;

#define pte_val(x)	((x).pte)
/* These do not work lvalues, so make sure we don't use them as such. */
#define pmd_val(x)	((x).pmd + 0)
#define pgd_val(x)	((x).pgd + 0)
#define pgprot_val(x)	((x).pgprot)

#define __pte(x)	((pte_t) { (x) } )
#define __pmd(x)	((pmd_t) { (x) } )
#define __pgd(x)	((pgd_t) { (x) } )
#define __pgprot(x)	((pgprot_t) { (x) } )

#define __pmd_val_set(x,n) (x).pmd = (n)
#define __pgd_val_set(x,n) (x).pgd = (n)

#else
/*
 * .. while these make it easier on the compiler
 */
typedef unsigned long pte_t;
typedef         __u32 pmd_t;
typedef         __u32 pgd_t;
typedef unsigned long pgprot_t;

#define pte_val(x)      (x)
#define pmd_val(x)      (x)
#define pgd_val(x)      (x)
#define pgprot_val(x)   (x)

#define __pte(x)        (x)
#define __pmd(x)	(x)
#define __pgd(x)        (x)
#define __pgprot(x)     (x)

#define __pmd_val_set(x,n) (x) = (n)
#define __pgd_val_set(x,n) (x) = (n)

#endif /* STRICT_MM_TYPECHECKS */

typedef struct page *pgtable_t;

typedef struct __physmem_range {
	unsigned long start_pfn;
	unsigned long pages;       /* PAGE_SIZE pages */
} physmem_range_t;

extern physmem_range_t pmem_ranges[];
extern int npmem_ranges;

#endif /* !__ASSEMBLY__ */

/* WARNING: The definitions below must match exactly to sizeof(pte_t)
 * etc
 */
#ifdef CONFIG_64BIT
#define BITS_PER_PTE_ENTRY	3
#define BITS_PER_PMD_ENTRY	2
#define BITS_PER_PGD_ENTRY	2
#else
#define BITS_PER_PTE_ENTRY	2
#define BITS_PER_PMD_ENTRY	2
#define BITS_PER_PGD_ENTRY	BITS_PER_PMD_ENTRY
#endif
#define PGD_ENTRY_SIZE	(1UL << BITS_PER_PGD_ENTRY)
#define PMD_ENTRY_SIZE	(1UL << BITS_PER_PMD_ENTRY)
#define PTE_ENTRY_SIZE	(1UL << BITS_PER_PTE_ENTRY)

#define LINUX_GATEWAY_SPACE     0

/* This governs the relationship between virtual and physical addresses.
 * If you alter it, make sure to take care of our various fixed mapping
 * segments in fixmap.h */
#ifdef CONFIG_64BIT
#define __PAGE_OFFSET_DEFAULT	(0x40000000)	/* 1GB */
#else
#define __PAGE_OFFSET_DEFAULT	(0x10000000)	/* 256MB */
#endif

#if defined(BOOTLOADER)
#define __PAGE_OFFSET	(0)	/* bootloader uses physical addresses */
#else
#define __PAGE_OFFSET	__PAGE_OFFSET_DEFAULT
#endif /* BOOTLOADER */

#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)

/* The size of the gateway page (we leave lots of room for expansion) */
#define GATEWAY_PAGE_SIZE	0x4000

/* The start of the actual kernel binary---used in vmlinux.lds.S
 * Leave some space after __PAGE_OFFSET for detecting kernel null
 * ptr derefs */
#define KERNEL_BINARY_TEXT_START	(__PAGE_OFFSET + 0x100000)

/* These macros don't work for 64-bit C code -- don't allow in C at all */
#ifdef __ASSEMBLY__
#   define PA(x)	((x)-__PAGE_OFFSET)
#   define VA(x)	((x)+__PAGE_OFFSET)
#endif
#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))

#ifndef CONFIG_SPARSEMEM
#define pfn_valid(pfn)		((pfn) < max_mapnr)
#endif

#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SHIFT		PMD_SHIFT /* fixed for transparent huge pages */
#define HPAGE_SIZE      	((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)

#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
# define REAL_HPAGE_SHIFT	20 /* 20 = 1MB */
# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
# define REAL_HPAGE_SHIFT	22 /* 22 = 4MB */
# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
#else
# define REAL_HPAGE_SHIFT	24 /* 24 = 16MB */
# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
#endif
#endif /* CONFIG_HUGETLB_PAGE */

#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

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

#define PAGE0   ((struct zeropage *)__PAGE_OFFSET)

/* DEFINITION OF THE ZERO-PAGE (PAG0) */
/* based on work by Jason Eckhardt (jason@equator.com) */

#endif /* _PARISC_PAGE_H */