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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _PARISC_PAGE_H
3#define _PARISC_PAGE_H
4
5#include <linux/const.h>
6
7#include <vdso/page.h>
8
9#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
10
11#ifndef __ASSEMBLY__
12
13#include <asm/types.h>
14#include <asm/cache.h>
15
16#define clear_page(page) clear_page_asm((void *)(page))
17#define copy_page(to, from) copy_page_asm((void *)(to), (void *)(from))
18
19struct page;
20struct vm_area_struct;
21
22void clear_page_asm(void *page);
23void copy_page_asm(void *to, void *from);
24#define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
25void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr,
26 struct vm_area_struct *vma);
27#define __HAVE_ARCH_COPY_USER_HIGHPAGE
28
29/*
30 * These are used to make use of C type-checking..
31 */
32#define STRICT_MM_TYPECHECKS
33#ifdef STRICT_MM_TYPECHECKS
34typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
35
36/* NOTE: even on 64 bits, these entries are __u32 because we allocate
37 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
38typedef struct { __u32 pgd; } pgd_t;
39typedef struct { unsigned long pgprot; } pgprot_t;
40
41#if CONFIG_PGTABLE_LEVELS == 3
42typedef struct { __u32 pmd; } pmd_t;
43#define __pmd(x) ((pmd_t) { (x) } )
44/* pXd_val() do not work as lvalues, so make sure we don't use them as such. */
45#define pmd_val(x) ((x).pmd + 0)
46#endif
47
48#define pte_val(x) ((x).pte)
49#define pgd_val(x) ((x).pgd + 0)
50#define pgprot_val(x) ((x).pgprot)
51
52#define __pte(x) ((pte_t) { (x) } )
53#define __pgd(x) ((pgd_t) { (x) } )
54#define __pgprot(x) ((pgprot_t) { (x) } )
55
56#else
57/*
58 * .. while these make it easier on the compiler
59 */
60typedef unsigned long pte_t;
61
62#if CONFIG_PGTABLE_LEVELS == 3
63typedef __u32 pmd_t;
64#define pmd_val(x) (x)
65#define __pmd(x) (x)
66#endif
67
68typedef __u32 pgd_t;
69typedef unsigned long pgprot_t;
70
71#define pte_val(x) (x)
72#define pgd_val(x) (x)
73#define pgprot_val(x) (x)
74
75#define __pte(x) (x)
76#define __pgd(x) (x)
77#define __pgprot(x) (x)
78
79#endif /* STRICT_MM_TYPECHECKS */
80
81#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
82#if CONFIG_PGTABLE_LEVELS == 3
83#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
84#endif
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 2
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_DEFAULT (0x40000000) /* 1GB */
121#else
122#define __PAGE_OFFSET_DEFAULT (0x10000000) /* 256MB */
123#endif
124
125#if defined(BOOTLOADER)
126#define __PAGE_OFFSET (0) /* bootloader uses physical addresses */
127#else
128#define __PAGE_OFFSET __PAGE_OFFSET_DEFAULT
129#endif /* BOOTLOADER */
130
131#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
132
133/* The size of the gateway page (we leave lots of room for expansion) */
134#define GATEWAY_PAGE_SIZE 0x4000
135
136/* The start of the actual kernel binary---used in vmlinux.lds.S
137 * Leave some space after __PAGE_OFFSET for detecting kernel null
138 * ptr derefs */
139#define KERNEL_BINARY_TEXT_START (__PAGE_OFFSET + 0x100000)
140
141/* These macros don't work for 64-bit C code -- don't allow in C at all */
142#ifdef __ASSEMBLY__
143# define PA(x) ((x)-__PAGE_OFFSET)
144# define VA(x) ((x)+__PAGE_OFFSET)
145#endif
146#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
147#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
148
149#ifdef CONFIG_HUGETLB_PAGE
150#define HPAGE_SHIFT PMD_SHIFT /* fixed for transparent huge pages */
151#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
152#define HPAGE_MASK (~(HPAGE_SIZE - 1))
153#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
154
155#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
156# define REAL_HPAGE_SHIFT 20 /* 20 = 1MB */
157# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
158#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
159# define REAL_HPAGE_SHIFT 22 /* 22 = 4MB */
160# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
161#else
162# define REAL_HPAGE_SHIFT 24 /* 24 = 16MB */
163# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
164#endif
165#endif /* CONFIG_HUGETLB_PAGE */
166
167#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
168
169#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
170
171#include <asm-generic/memory_model.h>
172#include <asm-generic/getorder.h>
173#include <asm/pdc.h>
174
175#define PAGE0 ((struct zeropage *)absolute_pointer(__PAGE_OFFSET))
176
177/* DEFINITION OF THE ZERO-PAGE (PAG0) */
178/* based on work by Jason Eckhardt (jason@equator.com) */
179
180#endif /* _PARISC_PAGE_H */