xref: /openbmc/linux/arch/sh/include/asm/page.h (revision e6926a4d)
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 
49 extern unsigned long shm_align_mask;
50 extern unsigned long max_low_pfn, min_low_pfn;
51 extern unsigned long memory_start, memory_end, memory_limit;
52 
53 static inline unsigned long
pages_do_alias(unsigned long addr1,unsigned long addr2)54 pages_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)
60 extern void copy_page(void *to, void *from);
61 #define copy_user_page(to, from, vaddr, pg)  __copy_user(to, from, PAGE_SIZE)
62 
63 struct page;
64 struct vm_area_struct;
65 
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
69 extern 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
76 typedef struct { unsigned long pte_low, pte_high; } pte_t;
77 typedef struct { unsigned long long pgprot; } pgprot_t;
78 typedef 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
84 typedef struct { unsigned long pte_low; } pte_t;
85 typedef struct { unsigned long pgprot; } pgprot_t;
86 typedef 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 
97 typedef 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