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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_PAGE_H
3#define __ASM_SH_PAGE_H
4
5/*
6 * Copyright (C) 1999 Niibe Yutaka
7 */
8
9#include <linux/const.h>
10
11/* PAGE_SHIFT determines the page size */
12#if defined(CONFIG_PAGE_SIZE_4KB)
13# define PAGE_SHIFT 12
14#elif defined(CONFIG_PAGE_SIZE_8KB)
15# define PAGE_SHIFT 13
16#elif defined(CONFIG_PAGE_SIZE_16KB)
17# define PAGE_SHIFT 14
18#elif defined(CONFIG_PAGE_SIZE_64KB)
19# define PAGE_SHIFT 16
20#else
21# error "Bogus kernel page size?"
22#endif
23
24#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
25#define PAGE_MASK (~(PAGE_SIZE-1))
26#define PTE_MASK PAGE_MASK
27
28#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
29#define HPAGE_SHIFT 16
30#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
31#define HPAGE_SHIFT 18
32#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
33#define HPAGE_SHIFT 20
34#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
35#define HPAGE_SHIFT 22
36#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
37#define HPAGE_SHIFT 26
38#endif
39
40#ifdef CONFIG_HUGETLB_PAGE
41#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
42#define HPAGE_MASK (~(HPAGE_SIZE-1))
43#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
44#endif
45
46#ifndef __ASSEMBLY__
47#include <asm/uncached.h>
48
49extern unsigned long shm_align_mask;
50extern unsigned long max_low_pfn, min_low_pfn;
51extern unsigned long memory_start, memory_end, memory_limit;
52
53static inline unsigned long
54pages_do_alias(unsigned long addr1, unsigned long addr2)
55{
56 return (addr1 ^ addr2) & shm_align_mask;
57}
58
59#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
60extern void copy_page(void *to, void *from);
61#define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE)
62
63struct page;
64struct vm_area_struct;
65
66extern void copy_user_highpage(struct page *to, struct page *from,
67 unsigned long vaddr, struct vm_area_struct *vma);
68#define __HAVE_ARCH_COPY_USER_HIGHPAGE
69extern void clear_user_highpage(struct page *page, unsigned long vaddr);
70#define clear_user_highpage clear_user_highpage
71
72/*
73 * These are used to make use of C type-checking..
74 */
75#ifdef CONFIG_X2TLB
76typedef struct { unsigned long pte_low, pte_high; } pte_t;
77typedef struct { unsigned long long pgprot; } pgprot_t;
78typedef struct { unsigned long long pgd; } pgd_t;
79#define pte_val(x) \
80 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
81#define __pte(x) \
82 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
83#else
84typedef struct { unsigned long pte_low; } pte_t;
85typedef struct { unsigned long pgprot; } pgprot_t;
86typedef struct { unsigned long pgd; } pgd_t;
87#define pte_val(x) ((x).pte_low)
88#define __pte(x) ((pte_t) { (x) } )
89#endif
90
91#define pgd_val(x) ((x).pgd)
92#define pgprot_val(x) ((x).pgprot)
93
94#define __pgd(x) ((pgd_t) { (x) } )
95#define __pgprot(x) ((pgprot_t) { (x) } )
96
97typedef struct page *pgtable_t;
98
99#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
100
101#endif /* !__ASSEMBLY__ */
102
103/*
104 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
105 */
106#define __MEMORY_START CONFIG_MEMORY_START
107#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
108
109/*
110 * PHYSICAL_OFFSET is the offset in physical memory where the base
111 * of the kernel is loaded.
112 */
113#ifdef CONFIG_PHYSICAL_START
114#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
115#else
116#define PHYSICAL_OFFSET 0
117#endif
118
119/*
120 * PAGE_OFFSET is the virtual address of the start of kernel address
121 * space.
122 */
123#define PAGE_OFFSET CONFIG_PAGE_OFFSET
124
125/*
126 * Virtual to physical RAM address translation.
127 *
128 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
129 * the kernel virtual address space, and thus we don't have to take
130 * this into account when translating. However in 32 bit mode this offset
131 * is not visible (it is part of the PMB mapping) and so needs to be
132 * added or subtracted as required.
133 */
134#ifdef CONFIG_PMB
135#define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START)
136#define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START)
137#else
138#define ___pa(x) ((x)-PAGE_OFFSET)
139#define ___va(x) ((x)+PAGE_OFFSET)
140#endif
141
142#ifndef __ASSEMBLY__
143#define __pa(x) ___pa((unsigned long)x)
144#define __va(x) (void *)___va((unsigned long)x)
145#endif /* !__ASSEMBLY__ */
146
147#ifdef CONFIG_UNCACHED_MAPPING
148#if defined(CONFIG_29BIT)
149#define UNCAC_ADDR(addr) P2SEGADDR(addr)
150#define CAC_ADDR(addr) P1SEGADDR(addr)
151#else
152#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start)
153#define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET)
154#endif
155#else
156#define UNCAC_ADDR(addr) ((addr))
157#define CAC_ADDR(addr) ((addr))
158#endif
159
160#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
161#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
162
163/*
164 * PFN = physical frame number (ie PFN 0 == physical address 0)
165 * PFN_START is the PFN of the first page of RAM. By defining this we
166 * don't have struct page entries for the portion of address space
167 * between physical address 0 and the start of RAM.
168 */
169#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
170#define ARCH_PFN_OFFSET (PFN_START)
171#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
172#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
173
174#include <asm-generic/memory_model.h>
175#include <asm-generic/getorder.h>
176
177#endif /* __ASM_SH_PAGE_H */
178

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source code of linux/arch/sh/include/asm/page.h