1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_IA64_PAGE_H
3 #define _ASM_IA64_PAGE_H
4 /*
5 * Pagetable related stuff.
6 *
7 * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 */
10
11 #include <asm/intrinsics.h>
12 #include <asm/types.h>
13
14 /*
15 * The top three bits of an IA64 address are its Region Number.
16 * Different regions are assigned to different purposes.
17 */
18 #define RGN_SHIFT (61)
19 #define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
20 #define RGN_BITS (RGN_BASE(-1))
21
22 #define RGN_KERNEL 7 /* Identity mapped region */
23 #define RGN_UNCACHED 6 /* Identity mapped I/O region */
24 #define RGN_GATE 5 /* Gate page, Kernel text, etc */
25 #define RGN_HPAGE 4 /* For Huge TLB pages */
26
27 /*
28 * PAGE_SHIFT determines the actual kernel page size.
29 */
30 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
31 # define PAGE_SHIFT 12
32 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
33 # define PAGE_SHIFT 13
34 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
35 # define PAGE_SHIFT 14
36 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
37 # define PAGE_SHIFT 16
38 #else
39 # error Unsupported page size!
40 #endif
41
42 #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
43 #define PAGE_MASK (~(PAGE_SIZE - 1))
44
45 #define PERCPU_PAGE_SHIFT 18 /* log2() of max. size of per-CPU area */
46 #define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
47
48
49 #ifdef CONFIG_HUGETLB_PAGE
50 # define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
51 # define HPAGE_SHIFT hpage_shift
52 # define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */
53 # define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
54 # define HPAGE_MASK (~(HPAGE_SIZE - 1))
55
56 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
57 #endif /* CONFIG_HUGETLB_PAGE */
58
59 #ifdef __ASSEMBLY__
60 # define __pa(x) ((x) - PAGE_OFFSET)
61 # define __va(x) ((x) + PAGE_OFFSET)
62 #else /* !__ASSEMBLY */
63 # define STRICT_MM_TYPECHECKS
64
65 extern void clear_page (void *page);
66 extern void copy_page (void *to, void *from);
67
68 /*
69 * clear_user_page() and copy_user_page() can't be inline functions because
70 * flush_dcache_page() can't be defined until later...
71 */
72 #define clear_user_page(addr, vaddr, page) \
73 do { \
74 clear_page(addr); \
75 flush_dcache_page(page); \
76 } while (0)
77
78 #define copy_user_page(to, from, vaddr, page) \
79 do { \
80 copy_page((to), (from)); \
81 flush_dcache_page(page); \
82 } while (0)
83
84
85 #define vma_alloc_zeroed_movable_folio(vma, vaddr) \
86 ({ \
87 struct folio *folio = vma_alloc_folio( \
88 GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false); \
89 if (folio) \
90 flush_dcache_folio(folio); \
91 folio; \
92 })
93
94 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
95
96 #include <asm-generic/memory_model.h>
97
98 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
99 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
100 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
101
102 typedef union ia64_va {
103 struct {
104 unsigned long off : 61; /* intra-region offset */
105 unsigned long reg : 3; /* region number */
106 } f;
107 unsigned long l;
108 void *p;
109 } ia64_va;
110
111 /*
112 * Note: These macros depend on the fact that PAGE_OFFSET has all
113 * region bits set to 1 and all other bits set to zero. They are
114 * expressed in this way to ensure they result in a single "dep"
115 * instruction.
116 */
117 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
118 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
119
120 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
121 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
122
123 #ifdef CONFIG_HUGETLB_PAGE
124 # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
125 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
126 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
127 extern unsigned int hpage_shift;
128 #endif
129
130 static __inline__ int
get_order(unsigned long size)131 get_order (unsigned long size)
132 {
133 long double d = size - 1;
134 long order;
135
136 order = ia64_getf_exp(d);
137 order = order - PAGE_SHIFT - 0xffff + 1;
138 if (order < 0)
139 order = 0;
140 return order;
141 }
142
143 #endif /* !__ASSEMBLY__ */
144
145 #ifdef STRICT_MM_TYPECHECKS
146 /*
147 * These are used to make use of C type-checking..
148 */
149 typedef struct { unsigned long pte; } pte_t;
150 typedef struct { unsigned long pmd; } pmd_t;
151 #if CONFIG_PGTABLE_LEVELS == 4
152 typedef struct { unsigned long pud; } pud_t;
153 #endif
154 typedef struct { unsigned long pgd; } pgd_t;
155 typedef struct { unsigned long pgprot; } pgprot_t;
156 typedef struct page *pgtable_t;
157
158 # define pte_val(x) ((x).pte)
159 # define pmd_val(x) ((x).pmd)
160 #if CONFIG_PGTABLE_LEVELS == 4
161 # define pud_val(x) ((x).pud)
162 #endif
163 # define pgd_val(x) ((x).pgd)
164 # define pgprot_val(x) ((x).pgprot)
165
166 # define __pte(x) ((pte_t) { (x) } )
167 # define __pmd(x) ((pmd_t) { (x) } )
168 # define __pgprot(x) ((pgprot_t) { (x) } )
169
170 #else /* !STRICT_MM_TYPECHECKS */
171 /*
172 * .. while these make it easier on the compiler
173 */
174 # ifndef __ASSEMBLY__
175 typedef unsigned long pte_t;
176 typedef unsigned long pmd_t;
177 typedef unsigned long pgd_t;
178 typedef unsigned long pgprot_t;
179 typedef struct page *pgtable_t;
180 # endif
181
182 # define pte_val(x) (x)
183 # define pmd_val(x) (x)
184 # define pgd_val(x) (x)
185 # define pgprot_val(x) (x)
186
187 # define __pte(x) (x)
188 # define __pgd(x) (x)
189 # define __pgprot(x) (x)
190 #endif /* !STRICT_MM_TYPECHECKS */
191
192 #define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
193
194 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC
195
196 #define GATE_ADDR RGN_BASE(RGN_GATE)
197
198 /*
199 * 0xa000000000000000+2*PERCPU_PAGE_SIZE
200 * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
201 */
202 #define KERNEL_START (GATE_ADDR+__IA64_UL_CONST(0x100000000))
203 #define PERCPU_ADDR (-PERCPU_PAGE_SIZE)
204 #define LOAD_OFFSET (KERNEL_START - KERNEL_TR_PAGE_SIZE)
205
206 #define __HAVE_ARCH_GATE_AREA 1
207
208 #endif /* _ASM_IA64_PAGE_H */
209