1#ifndef _PARISC_PAGE_H
2#define _PARISC_PAGE_H
3
4#include <linux/const.h>
5
6#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
7# define PAGE_SHIFT	12
8#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
9# define PAGE_SHIFT	14
10#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
11# define PAGE_SHIFT	16
12#else
13# error "unknown default kernel page size"
14#endif
15#define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
16#define PAGE_MASK	(~(PAGE_SIZE-1))
17
18
19#ifndef __ASSEMBLY__
20
21#include <asm/types.h>
22#include <asm/cache.h>
23
24#define clear_page(page)	clear_page_asm((void *)(page))
25#define copy_page(to, from)	copy_page_asm((void *)(to), (void *)(from))
26
27struct page;
28
29void clear_page_asm(void *page);
30void copy_page_asm(void *to, void *from);
31#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
32void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
33			struct page *pg);
34
35/*
36 * These are used to make use of C type-checking..
37 */
38#define STRICT_MM_TYPECHECKS
39#ifdef STRICT_MM_TYPECHECKS
40typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
41
42/* NOTE: even on 64 bits, these entries are __u32 because we allocate
43 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
44typedef struct { __u32 pmd; } pmd_t;
45typedef struct { __u32 pgd; } pgd_t;
46typedef struct { unsigned long pgprot; } pgprot_t;
47
48#define pte_val(x)	((x).pte)
49/* These do not work lvalues, so make sure we don't use them as such. */
50#define pmd_val(x)	((x).pmd + 0)
51#define pgd_val(x)	((x).pgd + 0)
52#define pgprot_val(x)	((x).pgprot)
53
54#define __pte(x)	((pte_t) { (x) } )
55#define __pmd(x)	((pmd_t) { (x) } )
56#define __pgd(x)	((pgd_t) { (x) } )
57#define __pgprot(x)	((pgprot_t) { (x) } )
58
59#define __pmd_val_set(x,n) (x).pmd = (n)
60#define __pgd_val_set(x,n) (x).pgd = (n)
61
62#else
63/*
64 * .. while these make it easier on the compiler
65 */
66typedef unsigned long pte_t;
67typedef         __u32 pmd_t;
68typedef         __u32 pgd_t;
69typedef unsigned long pgprot_t;
70
71#define pte_val(x)      (x)
72#define pmd_val(x)      (x)
73#define pgd_val(x)      (x)
74#define pgprot_val(x)   (x)
75
76#define __pte(x)        (x)
77#define __pmd(x)	(x)
78#define __pgd(x)        (x)
79#define __pgprot(x)     (x)
80
81#define __pmd_val_set(x,n) (x) = (n)
82#define __pgd_val_set(x,n) (x) = (n)
83
84#endif /* STRICT_MM_TYPECHECKS */
85
86typedef struct page *pgtable_t;
87
88typedef struct __physmem_range {
89	unsigned long start_pfn;
90	unsigned long pages;       /* PAGE_SIZE pages */
91} physmem_range_t;
92
93extern physmem_range_t pmem_ranges[];
94extern int npmem_ranges;
95
96#endif /* !__ASSEMBLY__ */
97
98/* WARNING: The definitions below must match exactly to sizeof(pte_t)
99 * etc
100 */
101#ifdef CONFIG_64BIT
102#define BITS_PER_PTE_ENTRY	3
103#define BITS_PER_PMD_ENTRY	2
104#define BITS_PER_PGD_ENTRY	2
105#else
106#define BITS_PER_PTE_ENTRY	2
107#define BITS_PER_PMD_ENTRY	2
108#define BITS_PER_PGD_ENTRY	BITS_PER_PMD_ENTRY
109#endif
110#define PGD_ENTRY_SIZE	(1UL << BITS_PER_PGD_ENTRY)
111#define PMD_ENTRY_SIZE	(1UL << BITS_PER_PMD_ENTRY)
112#define PTE_ENTRY_SIZE	(1UL << BITS_PER_PTE_ENTRY)
113
114#define LINUX_GATEWAY_SPACE     0
115
116/* This governs the relationship between virtual and physical addresses.
117 * If you alter it, make sure to take care of our various fixed mapping
118 * segments in fixmap.h */
119#ifdef CONFIG_64BIT
120#define __PAGE_OFFSET	(0x40000000)	/* 1GB */
121#else
122#define __PAGE_OFFSET	(0x10000000)	/* 256MB */
123#endif
124
125#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)
126
127/* The size of the gateway page (we leave lots of room for expansion) */
128#define GATEWAY_PAGE_SIZE	0x4000
129
130/* The start of the actual kernel binary---used in vmlinux.lds.S
131 * Leave some space after __PAGE_OFFSET for detecting kernel null
132 * ptr derefs */
133#define KERNEL_BINARY_TEXT_START	(__PAGE_OFFSET + 0x100000)
134
135/* These macros don't work for 64-bit C code -- don't allow in C at all */
136#ifdef __ASSEMBLY__
137#   define PA(x)	((x)-__PAGE_OFFSET)
138#   define VA(x)	((x)+__PAGE_OFFSET)
139#endif
140#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
141#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
142
143#ifndef CONFIG_DISCONTIGMEM
144#define pfn_valid(pfn)		((pfn) < max_mapnr)
145#endif /* CONFIG_DISCONTIGMEM */
146
147#ifdef CONFIG_HUGETLB_PAGE
148#define HPAGE_SHIFT		22	/* 4MB (is this fixed?) */
149#define HPAGE_SIZE      	((1UL) << HPAGE_SHIFT)
150#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
151#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
152#endif
153
154#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
155
156#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
157#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
158
159#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
160				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
161
162#include <asm-generic/memory_model.h>
163#include <asm-generic/getorder.h>
164#include <asm/pdc.h>
165
166#define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
167
168/* DEFINITION OF THE ZERO-PAGE (PAG0) */
169/* based on work by Jason Eckhardt (jason@equator.com) */
170
171#endif /* _PARISC_PAGE_H */
172