1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
4 * Copyright 2003 PathScale, Inc.
5 */
6
7#ifndef __UM_PAGE_H
8#define __UM_PAGE_H
9
10#include <linux/const.h>
11
12/* PAGE_SHIFT determines the page size */
13#define PAGE_SHIFT	CONFIG_PAGE_SHIFT
14#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
15#define PAGE_MASK	(~(PAGE_SIZE-1))
16
17#ifndef __ASSEMBLY__
18
19struct page;
20
21#include <linux/pfn.h>
22#include <linux/types.h>
23#include <asm/vm-flags.h>
24
25/*
26 * These are used to make use of C type-checking..
27 */
28
29#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
30#define copy_page(to,from)	memcpy((void *)(to), (void *)(from), PAGE_SIZE)
31
32#define clear_user_page(page, vaddr, pg)	clear_page(page)
33#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
34
35#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
36
37typedef struct { unsigned long pte; } pte_t;
38typedef struct { unsigned long pmd; } pmd_t;
39typedef struct { unsigned long pgd; } pgd_t;
40#define pte_val(p) ((p).pte)
41
42#define pte_get_bits(p, bits) ((p).pte & (bits))
43#define pte_set_bits(p, bits) ((p).pte |= (bits))
44#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
45#define pte_copy(to, from) ({ (to).pte = (from).pte; })
46#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
47#define pte_set_val(p, phys, prot) \
48	({ (p).pte = (phys) | pgprot_val(prot); })
49
50#define pmd_val(x)	((x).pmd)
51#define __pmd(x) ((pmd_t) { (x) } )
52
53typedef unsigned long long phys_t;
54
55#else
56
57typedef struct { unsigned long pte; } pte_t;
58typedef struct { unsigned long pgd; } pgd_t;
59
60#ifdef CONFIG_3_LEVEL_PGTABLES
61typedef struct { unsigned long pmd; } pmd_t;
62#define pmd_val(x)	((x).pmd)
63#define __pmd(x) ((pmd_t) { (x) } )
64#endif
65
66#define pte_val(x)	((x).pte)
67
68
69#define pte_get_bits(p, bits) ((p).pte & (bits))
70#define pte_set_bits(p, bits) ((p).pte |= (bits))
71#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
72#define pte_copy(to, from) ((to).pte = (from).pte)
73#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
74#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
75
76typedef unsigned long phys_t;
77
78#endif
79
80typedef struct { unsigned long pgprot; } pgprot_t;
81
82typedef struct page *pgtable_t;
83
84#define pgd_val(x)	((x).pgd)
85#define pgprot_val(x)	((x).pgprot)
86
87#define __pte(x) ((pte_t) { (x) } )
88#define __pgd(x) ((pgd_t) { (x) } )
89#define __pgprot(x)	((pgprot_t) { (x) } )
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) uml_to_phys((void *) (unsigned long) (virt))
106#define __va(phys) uml_to_virt((unsigned long) (phys))
107
108#define phys_to_pfn(p) ((p) >> PAGE_SHIFT)
109#define pfn_to_phys(pfn) PFN_PHYS(pfn)
110
111#define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
112
113#include <asm-generic/memory_model.h>
114#include <asm-generic/getorder.h>
115
116#endif	/* __ASSEMBLY__ */
117
118#ifdef CONFIG_X86_32
119#define __HAVE_ARCH_GATE_AREA 1
120#endif
121
122#endif	/* __UM_PAGE_H */
123