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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PAGE_H
10#define _ASM_PAGE_H
11
12#include <spaces.h>
13#include <linux/const.h>
14
15/*
16 * PAGE_SHIFT determines the page size
17 */
18#ifdef CONFIG_PAGE_SIZE_4KB
19#define PAGE_SHIFT 12
20#endif
21#ifdef CONFIG_PAGE_SIZE_8KB
22#define PAGE_SHIFT 13
23#endif
24#ifdef CONFIG_PAGE_SIZE_16KB
25#define PAGE_SHIFT 14
26#endif
27#ifdef CONFIG_PAGE_SIZE_32KB
28#define PAGE_SHIFT 15
29#endif
30#ifdef CONFIG_PAGE_SIZE_64KB
31#define PAGE_SHIFT 16
32#endif
33#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
34#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
35
36#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
37#define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
38#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
39#define HPAGE_MASK (~(HPAGE_SIZE - 1))
40#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
41#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */
42#define HPAGE_SHIFT ({BUILD_BUG(); 0; })
43#define HPAGE_SIZE ({BUILD_BUG(); 0; })
44#define HPAGE_MASK ({BUILD_BUG(); 0; })
45#define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; })
46#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
47
48#include <linux/pfn.h>
49
50extern void build_clear_page(void);
51extern void build_copy_page(void);
52
53/*
54 * It's normally defined only for FLATMEM config but it's
55 * used in our early mem init code for all memory models.
56 * So always define it.
57 */
58#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
59
60extern void clear_page(void * page);
61extern void copy_page(void * to, void * from);
62
63extern unsigned long shm_align_mask;
64
65static inline unsigned long pages_do_alias(unsigned long addr1,
66 unsigned long addr2)
67{
68 return (addr1 ^ addr2) & shm_align_mask;
69}
70
71struct page;
72
73static inline void clear_user_page(void *addr, unsigned long vaddr,
74 struct page *page)
75{
76 extern void (*flush_data_cache_page)(unsigned long addr);
77
78 clear_page(addr);
79 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
80 flush_data_cache_page((unsigned long)addr);
81}
82
83extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
84 struct page *to);
85struct vm_area_struct;
86extern void copy_user_highpage(struct page *to, struct page *from,
87 unsigned long vaddr, struct vm_area_struct *vma);
88
89#define __HAVE_ARCH_COPY_USER_HIGHPAGE
90
91/*
92 * These are used to make use of C type-checking..
93 */
94#ifdef CONFIG_64BIT_PHYS_ADDR
95 #ifdef CONFIG_CPU_MIPS32
96 typedef struct { unsigned long pte_low, pte_high; } pte_t;
97 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
98 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
99 #else
100 typedef struct { unsigned long long pte; } pte_t;
101 #define pte_val(x) ((x).pte)
102 #define __pte(x) ((pte_t) { (x) } )
103 #endif
104#else
105typedef struct { unsigned long pte; } pte_t;
106#define pte_val(x) ((x).pte)
107#define __pte(x) ((pte_t) { (x) } )
108#endif
109typedef struct page *pgtable_t;
110
111/*
112 * Right now we don't support 4-level pagetables, so all pud-related
113 * definitions come from <asm-generic/pgtable-nopud.h>.
114 */
115
116/*
117 * Finall the top of the hierarchy, the pgd
118 */
119typedef struct { unsigned long pgd; } pgd_t;
120#define pgd_val(x) ((x).pgd)
121#define __pgd(x) ((pgd_t) { (x) } )
122
123/*
124 * Manipulate page protection bits
125 */
126typedef struct { unsigned long pgprot; } pgprot_t;
127#define pgprot_val(x) ((x).pgprot)
128#define __pgprot(x) ((pgprot_t) { (x) } )
129
130/*
131 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
132 * pair of pages we only have a single global bit per pair of pages. When
133 * writing to the TLB make sure we always have the bit set for both pages
134 * or none. This macro is used to access the `buddy' of the pte we're just
135 * working on.
136 */
137#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
138
139/*
140 * __pa()/__va() should be used only during mem init.
141 */
142#ifdef CONFIG_64BIT
143#define __pa(x) \
144({ \
145 unsigned long __x = (unsigned long)(x); \
146 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \
147})
148#else
149#define __pa(x) \
150 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
151#endif
152#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
153#include <asm/io.h>
154
155/*
156 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
157 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The
158 * discussion can be found in lkml posting
159 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
160 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
161 *
162 * It is unclear if the misscompilations mentioned in
163 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
164 * until GCC 3.x has been retired before we can apply
165 * https://patchwork.linux-mips.org/patch/1541/
166 */
167
168#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
169
170#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
171
172#ifdef CONFIG_FLATMEM
173
174static inline int pfn_valid(unsigned long pfn)
175{
176 /* avoid <linux/mm.h> include hell */
177 extern unsigned long max_mapnr;
178
179 return pfn >= ARCH_PFN_OFFSET && pfn < max_mapnr;
180}
181
182#elif defined(CONFIG_SPARSEMEM)
183
184/* pfn_valid is defined in linux/mmzone.h */
185
186#elif defined(CONFIG_NEED_MULTIPLE_NODES)
187
188#define pfn_valid(pfn) \
189({ \
190 unsigned long __pfn = (pfn); \
191 int __n = pfn_to_nid(__pfn); \
192 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
193 NODE_DATA(__n)->node_spanned_pages) \
194 : 0); \
195})
196
197#endif
198
199#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
200
201extern int __virt_addr_valid(const volatile void *kaddr);
202#define virt_addr_valid(kaddr) \
203 __virt_addr_valid((const volatile void *) (kaddr))
204
205#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
206 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
207
208#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
209#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
210
211#include <asm-generic/memory_model.h>
212#include <asm-generic/getorder.h>
213
214#endif /* _ASM_PAGE_H */