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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _PARISC_PAGE_H
  3 #define _PARISC_PAGE_H
  4 
  5 #include <linux/const.h>
  6 
  7 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
  8 # define PAGE_SHIFT     12
  9 #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
 10 # define PAGE_SHIFT     14
 11 #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
 12 # define PAGE_SHIFT     16
 13 #else
 14 # error "unknown default kernel page size"
 15 #endif
 16 #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
 17 #define PAGE_MASK       (~(PAGE_SIZE-1))
 18 
 19 
 20 #ifndef __ASSEMBLY__
 21 
 22 #include <asm/types.h>
 23 #include <asm/cache.h>
 24 
 25 #define clear_page(page)        clear_page_asm((void *)(page))
 26 #define copy_page(to, from)     copy_page_asm((void *)(to), (void *)(from))
 27 
 28 struct page;
 29 
 30 void clear_page_asm(void *page);
 31 void copy_page_asm(void *to, void *from);
 32 #define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
 33 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 34                         struct page *pg);
 35 
 36 /*
 37  * These are used to make use of C type-checking..
 38  */
 39 #define STRICT_MM_TYPECHECKS
 40 #ifdef STRICT_MM_TYPECHECKS
 41 typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
 42 
 43 /* NOTE: even on 64 bits, these entries are __u32 because we allocate
 44  * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
 45 typedef struct { __u32 pmd; } pmd_t;
 46 typedef struct { __u32 pgd; } pgd_t;
 47 typedef struct { unsigned long pgprot; } pgprot_t;
 48 
 49 #define pte_val(x)      ((x).pte)
 50 /* These do not work lvalues, so make sure we don't use them as such. */
 51 #define pmd_val(x)      ((x).pmd + 0)
 52 #define pgd_val(x)      ((x).pgd + 0)
 53 #define pgprot_val(x)   ((x).pgprot)
 54 
 55 #define __pte(x)        ((pte_t) { (x) } )
 56 #define __pmd(x)        ((pmd_t) { (x) } )
 57 #define __pgd(x)        ((pgd_t) { (x) } )
 58 #define __pgprot(x)     ((pgprot_t) { (x) } )
 59 
 60 #define __pmd_val_set(x,n) (x).pmd = (n)
 61 #define __pgd_val_set(x,n) (x).pgd = (n)
 62 
 63 #else
 64 /*
 65  * .. while these make it easier on the compiler
 66  */
 67 typedef unsigned long pte_t;
 68 typedef         __u32 pmd_t;
 69 typedef         __u32 pgd_t;
 70 typedef unsigned long pgprot_t;
 71 
 72 #define pte_val(x)      (x)
 73 #define pmd_val(x)      (x)
 74 #define pgd_val(x)      (x)
 75 #define pgprot_val(x)   (x)
 76 
 77 #define __pte(x)        (x)
 78 #define __pmd(x)        (x)
 79 #define __pgd(x)        (x)
 80 #define __pgprot(x)     (x)
 81 
 82 #define __pmd_val_set(x,n) (x) = (n)
 83 #define __pgd_val_set(x,n) (x) = (n)
 84 
 85 #endif /* STRICT_MM_TYPECHECKS */
 86 
 87 typedef struct page *pgtable_t;
 88 
 89 typedef struct __physmem_range {
 90         unsigned long start_pfn;
 91         unsigned long pages;       /* PAGE_SIZE pages */
 92 } physmem_range_t;
 93 
 94 extern physmem_range_t pmem_ranges[];
 95 extern int npmem_ranges;
 96 
 97 #endif /* !__ASSEMBLY__ */
 98 
 99 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
100  * etc
101  */
102 #ifdef CONFIG_64BIT
103 #define BITS_PER_PTE_ENTRY      3
104 #define BITS_PER_PMD_ENTRY      2
105 #define BITS_PER_PGD_ENTRY      2
106 #else
107 #define BITS_PER_PTE_ENTRY      2
108 #define BITS_PER_PMD_ENTRY      2
109 #define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
110 #endif
111 #define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
112 #define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
113 #define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
114 
115 #define LINUX_GATEWAY_SPACE     0
116 
117 /* This governs the relationship between virtual and physical addresses.
118  * If you alter it, make sure to take care of our various fixed mapping
119  * segments in fixmap.h */
120 #ifdef CONFIG_64BIT
121 #define __PAGE_OFFSET_DEFAULT   (0x40000000)    /* 1GB */
122 #else
123 #define __PAGE_OFFSET_DEFAULT   (0x10000000)    /* 256MB */
124 #endif
125 
126 #if defined(BOOTLOADER)
127 #define __PAGE_OFFSET   (0)     /* bootloader uses physical addresses */
128 #else
129 #define __PAGE_OFFSET   __PAGE_OFFSET_DEFAULT
130 #endif /* BOOTLOADER */
131 
132 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
133 
134 /* The size of the gateway page (we leave lots of room for expansion) */
135 #define GATEWAY_PAGE_SIZE       0x4000
136 
137 /* The start of the actual kernel binary---used in vmlinux.lds.S
138  * Leave some space after __PAGE_OFFSET for detecting kernel null
139  * ptr derefs */
140 #define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
141 
142 /* These macros don't work for 64-bit C code -- don't allow in C at all */
143 #ifdef __ASSEMBLY__
144 #   define PA(x)        ((x)-__PAGE_OFFSET)
145 #   define VA(x)        ((x)+__PAGE_OFFSET)
146 #endif
147 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
148 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
149 
150 #ifndef CONFIG_SPARSEMEM
151 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
152 #endif
153 
154 #ifdef CONFIG_HUGETLB_PAGE
155 #define HPAGE_SHIFT             PMD_SHIFT /* fixed for transparent huge pages */
156 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
157 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
158 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
159 
160 #if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
161 # define REAL_HPAGE_SHIFT       20 /* 20 = 1MB */
162 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
163 #elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
164 # define REAL_HPAGE_SHIFT       22 /* 22 = 4MB */
165 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
166 #else
167 # define REAL_HPAGE_SHIFT       24 /* 24 = 16MB */
168 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
169 #endif
170 #endif /* CONFIG_HUGETLB_PAGE */
171 
172 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
173 
174 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
175 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
176 
177 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
178                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
179 
180 #include <asm-generic/memory_model.h>
181 #include <asm-generic/getorder.h>
182 #include <asm/pdc.h>
183 
184 #define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
185 
186 /* DEFINITION OF THE ZERO-PAGE (PAG0) */
187 /* based on work by Jason Eckhardt (jason@equator.com) */
188 
189 #endif /* _PARISC_PAGE_H */
190 

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