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