Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / arch / sh / include / asm / page.h
blob5eef8be3e59f9e733b0233c80c6b340d01ff6b38
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_PAGE_H
3 #define __ASM_SH_PAGE_H
5 /*
6 * Copyright (C) 1999 Niibe Yutaka
7 */
9 #include <linux/const.h>
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
24 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
25 #define PAGE_MASK (~(PAGE_SIZE-1))
26 #define PTE_MASK PAGE_MASK
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
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
48 #ifndef __ASSEMBLY__
49 #include <asm/uncached.h>
51 extern unsigned long shm_align_mask;
52 extern unsigned long max_low_pfn, min_low_pfn;
53 extern unsigned long memory_start, memory_end, memory_limit;
55 static inline unsigned long
56 pages_do_alias(unsigned long addr1, unsigned long addr2)
58 return (addr1 ^ addr2) & shm_align_mask;
61 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
62 extern void copy_page(void *to, void *from);
63 #define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE)
65 struct page;
66 struct vm_area_struct;
68 extern 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
71 extern void clear_user_highpage(struct page *page, unsigned long vaddr);
72 #define clear_user_highpage clear_user_highpage
75 * These are used to make use of C type-checking..
77 #ifdef CONFIG_X2TLB
78 typedef struct { unsigned long pte_low, pte_high; } pte_t;
79 typedef struct { unsigned long long pgprot; } pgprot_t;
80 typedef 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)
86 typedef struct { unsigned long pte_low; } pte_t;
87 typedef struct { unsigned long pgprot; } pgprot_t;
88 typedef struct { unsigned long pgd; } pgd_t;
89 #define pte_val(x) ((x).pte_low)
90 #define __pte(x) ((pte_t) { (x) } )
91 #else
92 typedef struct { unsigned long long pte_low; } pte_t;
93 typedef struct { unsigned long long pgprot; } pgprot_t;
94 typedef struct { unsigned long pgd; } pgd_t;
95 #define pte_val(x) ((x).pte_low)
96 #define __pte(x) ((pte_t) { (x) } )
97 #endif
99 #define pgd_val(x) ((x).pgd)
100 #define pgprot_val(x) ((x).pgprot)
102 #define __pgd(x) ((pgd_t) { (x) } )
103 #define __pgprot(x) ((pgprot_t) { (x) } )
105 typedef struct page *pgtable_t;
107 #define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
109 #endif /* !__ASSEMBLY__ */
112 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
114 #define __MEMORY_START CONFIG_MEMORY_START
115 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
118 * PHYSICAL_OFFSET is the offset in physical memory where the base
119 * of the kernel is loaded.
121 #ifdef CONFIG_PHYSICAL_START
122 #define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
123 #else
124 #define PHYSICAL_OFFSET 0
125 #endif
128 * PAGE_OFFSET is the virtual address of the start of kernel address
129 * space.
131 #define PAGE_OFFSET CONFIG_PAGE_OFFSET
134 * Virtual to physical RAM address translation.
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.
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
150 #ifndef __ASSEMBLY__
151 #define __pa(x) ___pa((unsigned long)x)
152 #define __va(x) (void *)___va((unsigned long)x)
153 #endif /* !__ASSEMBLY__ */
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
168 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
169 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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.
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)
185 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
186 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
188 #include <asm-generic/memory_model.h>
189 #include <asm-generic/getorder.h>
192 * Some drivers need to perform DMA into kmalloc'ed buffers
193 * and so we have to increase the kmalloc minalign for this.
195 #define ARCH_DMA_MINALIGN L1_CACHE_BYTES
197 #ifdef CONFIG_SUPERH64
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.
205 #define ARCH_SLAB_MINALIGN 8
206 #endif
208 #endif /* __ASM_SH_PAGE_H */