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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __ASM_SH_PAGE_H |
3 | #define __ASM_SH_PAGE_H | |
4 | ||
5 | /* | |
6 | * Copyright (C) 1999 Niibe Yutaka | |
7 | */ | |
8 | ||
d02b08f6 SM |
9 | #include <linux/const.h> |
10 | ||
1da177e4 | 11 | /* PAGE_SHIFT determines the page size */ |
21440cf0 PM |
12 | #if defined(CONFIG_PAGE_SIZE_4KB) |
13 | # define PAGE_SHIFT 12 | |
14 | #elif defined(CONFIG_PAGE_SIZE_8KB) | |
15 | # define PAGE_SHIFT 13 | |
66dfe181 PM |
16 | #elif defined(CONFIG_PAGE_SIZE_16KB) |
17 | # define PAGE_SHIFT 14 | |
21440cf0 PM |
18 | #elif defined(CONFIG_PAGE_SIZE_64KB) |
19 | # define PAGE_SHIFT 16 | |
20 | #else | |
21 | # error "Bogus kernel page size?" | |
22 | #endif | |
8c12b5dc | 23 | |
d02b08f6 | 24 | #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) |
1da177e4 LT |
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 | |
21440cf0 PM |
30 | #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) |
31 | #define HPAGE_SHIFT 18 | |
1da177e4 LT |
32 | #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) |
33 | #define HPAGE_SHIFT 20 | |
21440cf0 PM |
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 | |
1da177e4 LT |
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 | ||
1da177e4 | 46 | #ifndef __ASSEMBLY__ |
d01447b3 | 47 | #include <asm/uncached.h> |
1da177e4 | 48 | |
f3c25758 | 49 | extern unsigned long shm_align_mask; |
01066625 | 50 | extern unsigned long max_low_pfn, min_low_pfn; |
5e2ff328 | 51 | extern unsigned long memory_start, memory_end, memory_limit; |
f3c25758 | 52 | |
2277ab4a PM |
53 | static inline unsigned long |
54 | pages_do_alias(unsigned long addr1, unsigned long addr2) | |
55 | { | |
56 | return (addr1 ^ addr2) & shm_align_mask; | |
57 | } | |
58 | ||
dfff0fa6 | 59 | #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) |
379a95d1 | 60 | extern void copy_page(void *to, void *from); |
934ed25e | 61 | #define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE) |
1da177e4 | 62 | |
dfff0fa6 PM |
63 | struct page; |
64 | struct vm_area_struct; | |
65 | ||
7747b9a4 PM |
66 | extern 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 | |
dfff0fa6 PM |
69 | extern void clear_user_highpage(struct page *page, unsigned long vaddr); |
70 | #define clear_user_highpage clear_user_highpage | |
0dfae7d5 | 71 | |
1da177e4 LT |
72 | /* |
73 | * These are used to make use of C type-checking.. | |
74 | */ | |
21440cf0 PM |
75 | #ifdef CONFIG_X2TLB |
76 | typedef struct { unsigned long pte_low, pte_high; } pte_t; | |
77 | typedef struct { unsigned long long pgprot; } pgprot_t; | |
d04a0f79 | 78 | typedef struct { unsigned long long pgd; } pgd_t; |
21440cf0 PM |
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; }) | |
37744fee | 83 | #else |
21440cf0 | 84 | typedef struct { unsigned long pte_low; } pte_t; |
1da177e4 | 85 | typedef struct { unsigned long pgprot; } pgprot_t; |
d04a0f79 | 86 | typedef struct { unsigned long pgd; } pgd_t; |
21440cf0 | 87 | #define pte_val(x) ((x).pte_low) |
249cfea9 | 88 | #define __pte(x) ((pte_t) { (x) } ) |
21440cf0 PM |
89 | #endif |
90 | ||
1da177e4 LT |
91 | #define pgd_val(x) ((x).pgd) |
92 | #define pgprot_val(x) ((x).pgprot) | |
93 | ||
1da177e4 LT |
94 | #define __pgd(x) ((pgd_t) { (x) } ) |
95 | #define __pgprot(x) ((pgprot_t) { (x) } ) | |
96 | ||
2f569afd MS |
97 | typedef struct page *pgtable_t; |
98 | ||
cb700aa4 PM |
99 | #define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK) |
100 | ||
1da177e4 LT |
101 | #endif /* !__ASSEMBLY__ */ |
102 | ||
d02b08f6 SM |
103 | /* |
104 | * __MEMORY_START and SIZE are the physical addresses and size of RAM. | |
105 | */ | |
1da177e4 LT |
106 | #define __MEMORY_START CONFIG_MEMORY_START |
107 | #define __MEMORY_SIZE CONFIG_MEMORY_SIZE | |
1da177e4 | 108 | |
e66ac3f2 SH |
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 | ||
d02b08f6 SM |
119 | /* |
120 | * PAGE_OFFSET is the virtual address of the start of kernel address | |
121 | * space. | |
122 | */ | |
e7f93a35 | 123 | #define PAGE_OFFSET CONFIG_PAGE_OFFSET |
1da177e4 | 124 | |
d02b08f6 SM |
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 | */ | |
1d5cfcdf | 134 | #ifdef CONFIG_PMB |
7c4584d3 MF |
135 | #define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START) |
136 | #define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START) | |
d02b08f6 | 137 | #else |
7c4584d3 MF |
138 | #define ___pa(x) ((x)-PAGE_OFFSET) |
139 | #define ___va(x) ((x)+PAGE_OFFSET) | |
d02b08f6 SM |
140 | #endif |
141 | ||
7c4584d3 MF |
142 | #ifndef __ASSEMBLY__ |
143 | #define __pa(x) ___pa((unsigned long)x) | |
144 | #define __va(x) (void *)___va((unsigned long)x) | |
145 | #endif /* !__ASSEMBLY__ */ | |
146 | ||
9edef286 | 147 | #ifdef CONFIG_UNCACHED_MAPPING |
dfd3b596 NI |
148 | #if defined(CONFIG_29BIT) |
149 | #define UNCAC_ADDR(addr) P2SEGADDR(addr) | |
150 | #define CAC_ADDR(addr) P1SEGADDR(addr) | |
151 | #else | |
9edef286 PM |
152 | #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start) |
153 | #define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET) | |
dfd3b596 | 154 | #endif |
9edef286 PM |
155 | #else |
156 | #define UNCAC_ADDR(addr) ((addr)) | |
157 | #define CAC_ADDR(addr) ((addr)) | |
158 | #endif | |
159 | ||
d02b08f6 | 160 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
01066625 | 161 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) |
1da177e4 | 162 | |
d02b08f6 SM |
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 | */ | |
1da177e4 | 169 | #define PFN_START (__MEMORY_START >> PAGE_SHIFT) |
67bb2c69 | 170 | #define ARCH_PFN_OFFSET (PFN_START) |
1da177e4 | 171 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
1da177e4 LT |
172 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) |
173 | ||
104b8dea | 174 | #include <asm-generic/memory_model.h> |
5b17e1cd | 175 | #include <asm-generic/getorder.h> |
fd4fd5aa | 176 | |
cbd2d9d8 | 177 | /* |
66d485b4 PM |
178 | * Some drivers need to perform DMA into kmalloc'ed buffers |
179 | * and so we have to increase the kmalloc minalign for this. | |
cbd2d9d8 | 180 | */ |
a6eb9fe1 | 181 | #define ARCH_DMA_MINALIGN L1_CACHE_BYTES |
01fed931 | 182 | |
1da177e4 | 183 | #endif /* __ASM_SH_PAGE_H */ |