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Linux kernel mirror (for testing)
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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#include <vdso/page.h>
13
14#ifndef __ASSEMBLER__
15
16struct page;
17
18#include <linux/pfn.h>
19#include <linux/types.h>
20#include <asm/vm-flags.h>
21
22/*
23 * These are used to make use of C type-checking..
24 */
25
26#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
27#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
28
29#define clear_user_page(page, vaddr, pg) clear_page(page)
30#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
31
32typedef struct { unsigned long pte; } pte_t;
33typedef struct { unsigned long pgd; } pgd_t;
34
35#if CONFIG_PGTABLE_LEVELS > 2
36
37typedef struct { unsigned long pmd; } pmd_t;
38#define pmd_val(x) ((x).pmd)
39#define __pmd(x) ((pmd_t) { (x) } )
40
41#if CONFIG_PGTABLE_LEVELS > 3
42
43typedef struct { unsigned long pud; } pud_t;
44#define pud_val(x) ((x).pud)
45#define __pud(x) ((pud_t) { (x) } )
46
47#endif /* CONFIG_PGTABLE_LEVELS > 3 */
48#endif /* CONFIG_PGTABLE_LEVELS > 2 */
49
50#define pte_val(x) ((x).pte)
51
52#define pte_get_bits(p, bits) ((p).pte & (bits))
53#define pte_set_bits(p, bits) ((p).pte |= (bits))
54#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
55#define pte_copy(to, from) ((to).pte = (from).pte)
56#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEEDSYNC))
57#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
58
59typedef unsigned long phys_t;
60
61typedef struct { unsigned long pgprot; } pgprot_t;
62
63typedef struct page *pgtable_t;
64
65#define pgd_val(x) ((x).pgd)
66#define pgprot_val(x) ((x).pgprot)
67
68#define __pte(x) ((pte_t) { (x) } )
69#define __pgd(x) ((pgd_t) { (x) } )
70#define __pgprot(x) ((pgprot_t) { (x) } )
71
72extern unsigned long uml_physmem;
73
74#define PAGE_OFFSET (uml_physmem)
75#define KERNELBASE PAGE_OFFSET
76
77#define __va_space (8*1024*1024)
78
79#include <mem.h>
80
81/* Cast to unsigned long before casting to void * to avoid a warning from
82 * mmap_kmem about cutting a long long down to a void *. Not sure that
83 * casting is the right thing, but 32-bit UML can't have 64-bit virtual
84 * addresses
85 */
86#define __pa(virt) uml_to_phys((void *) (unsigned long) (virt))
87#define __va(phys) uml_to_virt((unsigned long) (phys))
88
89#define phys_to_pfn(p) ((p) >> PAGE_SHIFT)
90#define pfn_to_phys(pfn) PFN_PHYS(pfn)
91
92#define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
93
94#include <asm-generic/memory_model.h>
95#include <asm-generic/getorder.h>
96
97#endif /* __ASSEMBLER__ */
98
99#endif /* __UM_PAGE_H */