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Linux/arch/sh/include/asm/page.h

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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 /* 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
 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 #ifdef CONFIG_FLATMEM
173 #define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
174 #endif
175 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
176 
177 #include <asm-generic/memory_model.h>
178 #include <asm-generic/getorder.h>
179 
180 /*
181  * Some drivers need to perform DMA into kmalloc'ed buffers
182  * and so we have to increase the kmalloc minalign for this.
183  */
184 #define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
185 
186 #endif /* __ASM_SH_PAGE_H */
187 

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