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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
3 * Copyright 2003 PathScale, Inc.
4 * Licensed under the GPL
5 */
6
7#ifndef __UM_PAGE_H
8#define __UM_PAGE_H
9
10struct page;
11
12#include <asm/vm-flags.h>
13
14/* PAGE_SHIFT determines the page size */
15#define PAGE_SHIFT 12
16#define PAGE_SIZE (1UL << PAGE_SHIFT)
17#define PAGE_MASK (~(PAGE_SIZE-1))
18
19/*
20 * These are used to make use of C type-checking..
21 */
22
23#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
24#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
25
26#define clear_user_page(page, vaddr, pg) clear_page(page)
27#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
28
29#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
30
31typedef struct { unsigned long pte_low, pte_high; } pte_t;
32typedef struct { unsigned long long pmd; } pmd_t;
33typedef struct { unsigned long pgd; } pgd_t;
34#define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
35
36#define pte_get_bits(pte, bits) ((pte).pte_low & (bits))
37#define pte_set_bits(pte, bits) ((pte).pte_low |= (bits))
38#define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits))
39#define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \
40 smp_wmb(); \
41 (to).pte_low = (from).pte_low; })
42#define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high)
43#define pte_set_val(pte, phys, prot) \
44 ({ (pte).pte_high = (phys) >> 32; \
45 (pte).pte_low = (phys) | pgprot_val(prot); })
46
47#define pmd_val(x) ((x).pmd)
48#define __pmd(x) ((pmd_t) { (x) } )
49
50typedef unsigned long long pfn_t;
51typedef unsigned long long phys_t;
52
53#else
54
55typedef struct { unsigned long pte; } pte_t;
56typedef struct { unsigned long pgd; } pgd_t;
57
58#ifdef CONFIG_3_LEVEL_PGTABLES
59typedef struct { unsigned long pmd; } pmd_t;
60#define pmd_val(x) ((x).pmd)
61#define __pmd(x) ((pmd_t) { (x) } )
62#endif
63
64#define pte_val(x) ((x).pte)
65
66
67#define pte_get_bits(p, bits) ((p).pte & (bits))
68#define pte_set_bits(p, bits) ((p).pte |= (bits))
69#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
70#define pte_copy(to, from) ((to).pte = (from).pte)
71#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
72#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
73
74typedef unsigned long pfn_t;
75typedef unsigned long phys_t;
76
77#endif
78
79typedef struct { unsigned long pgprot; } pgprot_t;
80
81#define pgd_val(x) ((x).pgd)
82#define pgprot_val(x) ((x).pgprot)
83
84#define __pte(x) ((pte_t) { (x) } )
85#define __pgd(x) ((pgd_t) { (x) } )
86#define __pgprot(x) ((pgprot_t) { (x) } )
87
88/* to align the pointer to the (next) page boundary */
89#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
90
91extern unsigned long uml_physmem;
92
93#define PAGE_OFFSET (uml_physmem)
94#define KERNELBASE PAGE_OFFSET
95
96#define __va_space (8*1024*1024)
97
98#include "mem.h"
99
100/* Cast to unsigned long before casting to void * to avoid a warning from
101 * mmap_kmem about cutting a long long down to a void *. Not sure that
102 * casting is the right thing, but 32-bit UML can't have 64-bit virtual
103 * addresses
104 */
105#define __pa(virt) to_phys((void *) (unsigned long) (virt))
106#define __va(phys) to_virt((unsigned long) (phys))
107
108#define phys_to_pfn(p) ((p) >> PAGE_SHIFT)
109#define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
110
111#define pfn_valid(pfn) ((pfn) < max_mapnr)
112#define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
113
114extern struct page *arch_validate(struct page *page, gfp_t mask, int order);
115#define HAVE_ARCH_VALIDATE
116
117#include <asm-generic/memory_model.h>
118#include <asm-generic/page.h>
119
120#endif