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