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 pgd; } pgd_t;
46 typedef struct { unsigned long pgprot; } pgprot_t;
47 
48 #if CONFIG_PGTABLE_LEVELS == 3
49 typedef struct { __u32 pmd; } pmd_t;
50 #define __pmd(x)	((pmd_t) { (x) } )
51 /* pXd_val() do not work as lvalues, so make sure we don't use them as such. */
52 #define pmd_val(x)	((x).pmd + 0)
53 #endif
54 
55 #define pte_val(x)	((x).pte)
56 #define pgd_val(x)	((x).pgd + 0)
57 #define pgprot_val(x)	((x).pgprot)
58 
59 #define __pte(x)	((pte_t) { (x) } )
60 #define __pgd(x)	((pgd_t) { (x) } )
61 #define __pgprot(x)	((pgprot_t) { (x) } )
62 
63 #else
64 /*
65  * .. while these make it easier on the compiler
66  */
67 typedef unsigned long pte_t;
68 
69 #if CONFIG_PGTABLE_LEVELS == 3
70 typedef         __u32 pmd_t;
71 #define pmd_val(x)      (x)
72 #define __pmd(x)	(x)
73 #endif
74 
75 typedef         __u32 pgd_t;
76 typedef unsigned long pgprot_t;
77 
78 #define pte_val(x)      (x)
79 #define pgd_val(x)      (x)
80 #define pgprot_val(x)   (x)
81 
82 #define __pte(x)        (x)
83 #define __pgd(x)        (x)
84 #define __pgprot(x)     (x)
85 
86 #endif /* STRICT_MM_TYPECHECKS */
87 
88 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
89 #if CONFIG_PGTABLE_LEVELS == 3
90 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
91 #endif
92 
93 typedef struct page *pgtable_t;
94 
95 typedef struct __physmem_range {
96 	unsigned long start_pfn;
97 	unsigned long pages;       /* PAGE_SIZE pages */
98 } physmem_range_t;
99 
100 extern physmem_range_t pmem_ranges[];
101 extern int npmem_ranges;
102 
103 #endif /* !__ASSEMBLY__ */
104 
105 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
106  * etc
107  */
108 #ifdef CONFIG_64BIT
109 #define BITS_PER_PTE_ENTRY	3
110 #define BITS_PER_PMD_ENTRY	2
111 #define BITS_PER_PGD_ENTRY	2
112 #else
113 #define BITS_PER_PTE_ENTRY	2
114 #define BITS_PER_PMD_ENTRY	2
115 #define BITS_PER_PGD_ENTRY	2
116 #endif
117 #define PGD_ENTRY_SIZE	(1UL << BITS_PER_PGD_ENTRY)
118 #define PMD_ENTRY_SIZE	(1UL << BITS_PER_PMD_ENTRY)
119 #define PTE_ENTRY_SIZE	(1UL << BITS_PER_PTE_ENTRY)
120 
121 #define LINUX_GATEWAY_SPACE     0
122 
123 /* This governs the relationship between virtual and physical addresses.
124  * If you alter it, make sure to take care of our various fixed mapping
125  * segments in fixmap.h */
126 #ifdef CONFIG_64BIT
127 #define __PAGE_OFFSET_DEFAULT	(0x40000000)	/* 1GB */
128 #else
129 #define __PAGE_OFFSET_DEFAULT	(0x10000000)	/* 256MB */
130 #endif
131 
132 #if defined(BOOTLOADER)
133 #define __PAGE_OFFSET	(0)	/* bootloader uses physical addresses */
134 #else
135 #define __PAGE_OFFSET	__PAGE_OFFSET_DEFAULT
136 #endif /* BOOTLOADER */
137 
138 #define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)
139 
140 /* The size of the gateway page (we leave lots of room for expansion) */
141 #define GATEWAY_PAGE_SIZE	0x4000
142 
143 /* The start of the actual kernel binary---used in vmlinux.lds.S
144  * Leave some space after __PAGE_OFFSET for detecting kernel null
145  * ptr derefs */
146 #define KERNEL_BINARY_TEXT_START	(__PAGE_OFFSET + 0x100000)
147 
148 /* These macros don't work for 64-bit C code -- don't allow in C at all */
149 #ifdef __ASSEMBLY__
150 #   define PA(x)	((x)-__PAGE_OFFSET)
151 #   define VA(x)	((x)+__PAGE_OFFSET)
152 #endif
153 #define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
154 #define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
155 
156 #ifndef CONFIG_SPARSEMEM
157 #define pfn_valid(pfn)		((pfn) < max_mapnr)
158 #endif
159 
160 #ifdef CONFIG_HUGETLB_PAGE
161 #define HPAGE_SHIFT		PMD_SHIFT /* fixed for transparent huge pages */
162 #define HPAGE_SIZE      	((1UL) << HPAGE_SHIFT)
163 #define HPAGE_MASK		(~(HPAGE_SIZE - 1))
164 #define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
165 
166 #if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
167 # define REAL_HPAGE_SHIFT	20 /* 20 = 1MB */
168 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
169 #elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
170 # define REAL_HPAGE_SHIFT	22 /* 22 = 4MB */
171 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
172 #else
173 # define REAL_HPAGE_SHIFT	24 /* 24 = 16MB */
174 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
175 #endif
176 #endif /* CONFIG_HUGETLB_PAGE */
177 
178 #define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
179 
180 #define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
181 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
182 
183 #include <asm-generic/memory_model.h>
184 #include <asm-generic/getorder.h>
185 #include <asm/pdc.h>
186 
187 #define PAGE0   ((struct zeropage *)absolute_pointer(__PAGE_OFFSET))
188 
189 /* DEFINITION OF THE ZERO-PAGE (PAG0) */
190 /* based on work by Jason Eckhardt (jason@equator.com) */
191 
192 #endif /* _PARISC_PAGE_H */
193