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Linux kernel mirror (for testing)
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linux
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
39#define HPAGE_SHIFT 29
40#endif
41
42#ifdef CONFIG_HUGETLB_PAGE
43#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
44#define HPAGE_MASK (~(HPAGE_SIZE-1))
45#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
46#endif
47
48#ifndef __ASSEMBLY__
49#include <asm/uncached.h>
50
51extern unsigned long shm_align_mask;
52extern unsigned long max_low_pfn, min_low_pfn;
53extern unsigned long memory_start, memory_end, memory_limit;
54
55static inline unsigned long
56pages_do_alias(unsigned long addr1, unsigned long addr2)
57{
58 return (addr1 ^ addr2) & shm_align_mask;
59}
60
61#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
62extern void copy_page(void *to, void *from);
63#define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE)
64
65struct page;
66struct vm_area_struct;
67
68extern void copy_user_highpage(struct page *to, struct page *from,
69 unsigned long vaddr, struct vm_area_struct *vma);
70#define __HAVE_ARCH_COPY_USER_HIGHPAGE
71extern void clear_user_highpage(struct page *page, unsigned long vaddr);
72#define clear_user_highpage clear_user_highpage
73
74/*
75 * These are used to make use of C type-checking..
76 */
77#ifdef CONFIG_X2TLB
78typedef struct { unsigned long pte_low, pte_high; } pte_t;
79typedef struct { unsigned long long pgprot; } pgprot_t;
80typedef struct { unsigned long long pgd; } pgd_t;
81#define pte_val(x) \
82 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
83#define __pte(x) \
84 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
85#elif defined(CONFIG_SUPERH32)
86typedef struct { unsigned long pte_low; } pte_t;
87typedef struct { unsigned long pgprot; } pgprot_t;
88typedef struct { unsigned long pgd; } pgd_t;
89#define pte_val(x) ((x).pte_low)
90#define __pte(x) ((pte_t) { (x) } )
91#else
92typedef struct { unsigned long long pte_low; } pte_t;
93typedef struct { unsigned long long pgprot; } pgprot_t;
94typedef struct { unsigned long pgd; } pgd_t;
95#define pte_val(x) ((x).pte_low)
96#define __pte(x) ((pte_t) { (x) } )
97#endif
98
99#define pgd_val(x) ((x).pgd)
100#define pgprot_val(x) ((x).pgprot)
101
102#define __pgd(x) ((pgd_t) { (x) } )
103#define __pgprot(x) ((pgprot_t) { (x) } )
104
105typedef struct page *pgtable_t;
106
107#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
108
109#endif /* !__ASSEMBLY__ */
110
111/*
112 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
113 */
114#define __MEMORY_START CONFIG_MEMORY_START
115#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
116
117/*
118 * PHYSICAL_OFFSET is the offset in physical memory where the base
119 * of the kernel is loaded.
120 */
121#ifdef CONFIG_PHYSICAL_START
122#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
123#else
124#define PHYSICAL_OFFSET 0
125#endif
126
127/*
128 * PAGE_OFFSET is the virtual address of the start of kernel address
129 * space.
130 */
131#define PAGE_OFFSET CONFIG_PAGE_OFFSET
132
133/*
134 * Virtual to physical RAM address translation.
135 *
136 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
137 * the kernel virtual address space, and thus we don't have to take
138 * this into account when translating. However in 32 bit mode this offset
139 * is not visible (it is part of the PMB mapping) and so needs to be
140 * added or subtracted as required.
141 */
142#ifdef CONFIG_PMB
143#define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START)
144#define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START)
145#else
146#define ___pa(x) ((x)-PAGE_OFFSET)
147#define ___va(x) ((x)+PAGE_OFFSET)
148#endif
149
150#ifndef __ASSEMBLY__
151#define __pa(x) ___pa((unsigned long)x)
152#define __va(x) (void *)___va((unsigned long)x)
153#endif /* !__ASSEMBLY__ */
154
155#ifdef CONFIG_UNCACHED_MAPPING
156#if defined(CONFIG_29BIT)
157#define UNCAC_ADDR(addr) P2SEGADDR(addr)
158#define CAC_ADDR(addr) P1SEGADDR(addr)
159#else
160#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start)
161#define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET)
162#endif
163#else
164#define UNCAC_ADDR(addr) ((addr))
165#define CAC_ADDR(addr) ((addr))
166#endif
167
168#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
169#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
170
171/*
172 * PFN = physical frame number (ie PFN 0 == physical address 0)
173 * PFN_START is the PFN of the first page of RAM. By defining this we
174 * don't have struct page entries for the portion of address space
175 * between physical address 0 and the start of RAM.
176 */
177#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
178#define ARCH_PFN_OFFSET (PFN_START)
179#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
180#ifdef CONFIG_FLATMEM
181#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
182#endif
183#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
184
185#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
186 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
187
188#include <asm-generic/memory_model.h>
189#include <asm-generic/getorder.h>
190
191/*
192 * Some drivers need to perform DMA into kmalloc'ed buffers
193 * and so we have to increase the kmalloc minalign for this.
194 */
195#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
196
197#ifdef CONFIG_SUPERH64
198/*
199 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
200 * happily generate {ld/st}.q pairs, requiring us to have 8-byte
201 * alignment to avoid traps. The kmalloc alignment is guaranteed by
202 * virtue of L1_CACHE_BYTES, requiring this to only be special cased
203 * for slab caches.
204 */
205#define ARCH_SLAB_MINALIGN 8
206#endif
207
208#endif /* __ASM_SH_PAGE_H */