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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#include <linux/kernel.h>
15#include <asm/mipsregs.h>
16
17/*
18 * PAGE_SHIFT determines the page size
19 */
20#ifdef CONFIG_PAGE_SIZE_4KB
21#define PAGE_SHIFT 12
22#endif
23#ifdef CONFIG_PAGE_SIZE_8KB
24#define PAGE_SHIFT 13
25#endif
26#ifdef CONFIG_PAGE_SIZE_16KB
27#define PAGE_SHIFT 14
28#endif
29#ifdef CONFIG_PAGE_SIZE_32KB
30#define PAGE_SHIFT 15
31#endif
32#ifdef CONFIG_PAGE_SIZE_64KB
33#define PAGE_SHIFT 16
34#endif
35#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
36#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
37
38/*
39 * This is used for calculating the real page sizes
40 * for FTLB or VTLB + FTLB configurations.
41 */
42static inline unsigned int page_size_ftlb(unsigned int mmuextdef)
43{
44 switch (mmuextdef) {
45 case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
46 if (PAGE_SIZE == (1 << 30))
47 return 5;
48 if (PAGE_SIZE == (1llu << 32))
49 return 6;
50 if (PAGE_SIZE > (256 << 10))
51 return 7; /* reserved */
52 /* fall through */
53 case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
54 return (PAGE_SHIFT - 10) / 2;
55 default:
56 panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n",
57 mmuextdef >> 14);
58 }
59}
60
61#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
62#define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
63#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
64#define HPAGE_MASK (~(HPAGE_SIZE - 1))
65#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
66#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */
67#define HPAGE_SHIFT ({BUILD_BUG(); 0; })
68#define HPAGE_SIZE ({BUILD_BUG(); 0; })
69#define HPAGE_MASK ({BUILD_BUG(); 0; })
70#define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; })
71#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
72
73#include <linux/pfn.h>
74
75extern void build_clear_page(void);
76extern void build_copy_page(void);
77
78/*
79 * It's normally defined only for FLATMEM config but it's
80 * used in our early mem init code for all memory models.
81 * So always define it.
82 */
83#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
84
85extern void clear_page(void * page);
86extern void copy_page(void * to, void * from);
87
88extern unsigned long shm_align_mask;
89
90static inline unsigned long pages_do_alias(unsigned long addr1,
91 unsigned long addr2)
92{
93 return (addr1 ^ addr2) & shm_align_mask;
94}
95
96struct page;
97
98static inline void clear_user_page(void *addr, unsigned long vaddr,
99 struct page *page)
100{
101 extern void (*flush_data_cache_page)(unsigned long addr);
102
103 clear_page(addr);
104 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
105 flush_data_cache_page((unsigned long)addr);
106}
107
108struct vm_area_struct;
109extern void copy_user_highpage(struct page *to, struct page *from,
110 unsigned long vaddr, struct vm_area_struct *vma);
111
112#define __HAVE_ARCH_COPY_USER_HIGHPAGE
113
114/*
115 * These are used to make use of C type-checking..
116 */
117#ifdef CONFIG_PHYS_ADDR_T_64BIT
118 #ifdef CONFIG_CPU_MIPS32
119 typedef struct { unsigned long pte_low, pte_high; } pte_t;
120 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
121 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
122 #else
123 typedef struct { unsigned long long pte; } pte_t;
124 #define pte_val(x) ((x).pte)
125 #define __pte(x) ((pte_t) { (x) } )
126 #endif
127#else
128typedef struct { unsigned long pte; } pte_t;
129#define pte_val(x) ((x).pte)
130#define __pte(x) ((pte_t) { (x) } )
131#endif
132typedef struct page *pgtable_t;
133
134/*
135 * Right now we don't support 4-level pagetables, so all pud-related
136 * definitions come from <asm-generic/pgtable-nopud.h>.
137 */
138
139/*
140 * Finall the top of the hierarchy, the pgd
141 */
142typedef struct { unsigned long pgd; } pgd_t;
143#define pgd_val(x) ((x).pgd)
144#define __pgd(x) ((pgd_t) { (x) } )
145
146/*
147 * Manipulate page protection bits
148 */
149typedef struct { unsigned long pgprot; } pgprot_t;
150#define pgprot_val(x) ((x).pgprot)
151#define __pgprot(x) ((pgprot_t) { (x) } )
152
153/*
154 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
155 * pair of pages we only have a single global bit per pair of pages. When
156 * writing to the TLB make sure we always have the bit set for both pages
157 * or none. This macro is used to access the `buddy' of the pte we're just
158 * working on.
159 */
160#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
161
162/*
163 * __pa()/__va() should be used only during mem init.
164 */
165static inline unsigned long ___pa(unsigned long x)
166{
167 if (IS_ENABLED(CONFIG_64BIT)) {
168 /*
169 * For MIPS64 the virtual address may either be in one of
170 * the compatibility segements ckseg0 or ckseg1, or it may
171 * be in xkphys.
172 */
173 return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x);
174 }
175
176 if (!IS_ENABLED(CONFIG_EVA)) {
177 /*
178 * We're using the standard MIPS32 legacy memory map, ie.
179 * the address x is going to be in kseg0 or kseg1. We can
180 * handle either case by masking out the desired bits using
181 * CPHYSADDR.
182 */
183 return CPHYSADDR(x);
184 }
185
186 /*
187 * EVA is in use so the memory map could be anything, making it not
188 * safe to just mask out bits.
189 */
190 return x - PAGE_OFFSET + PHYS_OFFSET;
191}
192#define __pa(x) ___pa((unsigned long)(x))
193#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
194#include <asm/io.h>
195
196/*
197 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
198 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The
199 * discussion can be found in lkml posting
200 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
201 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
202 *
203 * It is unclear if the misscompilations mentioned in
204 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
205 * until GCC 3.x has been retired before we can apply
206 * https://patchwork.linux-mips.org/patch/1541/
207 */
208
209#ifndef __pa_symbol
210#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
211#endif
212
213#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
214
215#ifdef CONFIG_FLATMEM
216
217static inline int pfn_valid(unsigned long pfn)
218{
219 /* avoid <linux/mm.h> include hell */
220 extern unsigned long max_mapnr;
221 unsigned long pfn_offset = ARCH_PFN_OFFSET;
222
223 return pfn >= pfn_offset && pfn < max_mapnr;
224}
225
226#elif defined(CONFIG_SPARSEMEM)
227
228/* pfn_valid is defined in linux/mmzone.h */
229
230#elif defined(CONFIG_NEED_MULTIPLE_NODES)
231
232#define pfn_valid(pfn) \
233({ \
234 unsigned long __pfn = (pfn); \
235 int __n = pfn_to_nid(__pfn); \
236 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
237 NODE_DATA(__n)->node_spanned_pages) \
238 : 0); \
239})
240
241#endif
242
243#define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr)))
244#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
245
246extern int __virt_addr_valid(const volatile void *kaddr);
247#define virt_addr_valid(kaddr) \
248 __virt_addr_valid((const volatile void *) (kaddr))
249
250#define VM_DATA_DEFAULT_FLAGS \
251 (VM_READ | VM_WRITE | \
252 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
253 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
254
255#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
256#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
257
258#include <asm-generic/memory_model.h>
259#include <asm-generic/getorder.h>
260
261#endif /* _ASM_PAGE_H */
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#include <linux/kernel.h>
15#include <asm/mipsregs.h>
16
17/*
18 * PAGE_SHIFT determines the page size
19 */
20#define PAGE_SHIFT CONFIG_PAGE_SHIFT
21#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
22#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
23
24/*
25 * This is used for calculating the real page sizes
26 * for FTLB or VTLB + FTLB configurations.
27 */
28static inline unsigned int page_size_ftlb(unsigned int mmuextdef)
29{
30 switch (mmuextdef) {
31 case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
32 if (PAGE_SIZE == (1 << 30))
33 return 5;
34 if (PAGE_SIZE == (1llu << 32))
35 return 6;
36 if (PAGE_SIZE > (256 << 10))
37 return 7; /* reserved */
38 fallthrough;
39 case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
40 return (PAGE_SHIFT - 10) / 2;
41 default:
42 panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n",
43 mmuextdef >> 14);
44 }
45}
46
47#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
48#define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
49#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
50#define HPAGE_MASK (~(HPAGE_SIZE - 1))
51#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
52#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */
53#define HPAGE_SHIFT ({BUILD_BUG(); 0; })
54#define HPAGE_SIZE ({BUILD_BUG(); 0; })
55#define HPAGE_MASK ({BUILD_BUG(); 0; })
56#define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; })
57#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
58
59#include <linux/pfn.h>
60
61extern void build_clear_page(void);
62extern void build_copy_page(void);
63
64/*
65 * It's normally defined only for FLATMEM config but it's
66 * used in our early mem init code for all memory models.
67 * So always define it.
68 */
69#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
70extern unsigned long ARCH_PFN_OFFSET;
71# define ARCH_PFN_OFFSET ARCH_PFN_OFFSET
72#else
73# define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
74#endif
75
76extern void clear_page(void * page);
77extern void copy_page(void * to, void * from);
78
79extern unsigned long shm_align_mask;
80
81static inline unsigned long pages_do_alias(unsigned long addr1,
82 unsigned long addr2)
83{
84 return (addr1 ^ addr2) & shm_align_mask;
85}
86
87struct page;
88
89static inline void clear_user_page(void *addr, unsigned long vaddr,
90 struct page *page)
91{
92 extern void (*flush_data_cache_page)(unsigned long addr);
93
94 clear_page(addr);
95 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
96 flush_data_cache_page((unsigned long)addr);
97}
98
99struct vm_area_struct;
100extern void copy_user_highpage(struct page *to, struct page *from,
101 unsigned long vaddr, struct vm_area_struct *vma);
102
103#define __HAVE_ARCH_COPY_USER_HIGHPAGE
104
105/*
106 * These are used to make use of C type-checking..
107 */
108#ifdef CONFIG_PHYS_ADDR_T_64BIT
109 #ifdef CONFIG_CPU_MIPS32
110 typedef struct { unsigned long pte_low, pte_high; } pte_t;
111 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
112 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
113 #else
114 typedef struct { unsigned long long pte; } pte_t;
115 #define pte_val(x) ((x).pte)
116 #define __pte(x) ((pte_t) { (x) } )
117 #endif
118#else
119typedef struct { unsigned long pte; } pte_t;
120#define pte_val(x) ((x).pte)
121#define __pte(x) ((pte_t) { (x) } )
122#endif
123typedef struct page *pgtable_t;
124
125/*
126 * Right now we don't support 4-level pagetables, so all pud-related
127 * definitions come from <asm-generic/pgtable-nopud.h>.
128 */
129
130/*
131 * Finall the top of the hierarchy, the pgd
132 */
133typedef struct { unsigned long pgd; } pgd_t;
134#define pgd_val(x) ((x).pgd)
135#define __pgd(x) ((pgd_t) { (x) } )
136
137/*
138 * Manipulate page protection bits
139 */
140typedef struct { unsigned long pgprot; } pgprot_t;
141#define pgprot_val(x) ((x).pgprot)
142#define __pgprot(x) ((pgprot_t) { (x) } )
143#define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK)
144
145/*
146 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
147 * pair of pages we only have a single global bit per pair of pages. When
148 * writing to the TLB make sure we always have the bit set for both pages
149 * or none. This macro is used to access the `buddy' of the pte we're just
150 * working on.
151 */
152#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
153
154/*
155 * __pa()/__va() should be used only during mem init.
156 */
157static inline unsigned long ___pa(unsigned long x)
158{
159 if (IS_ENABLED(CONFIG_64BIT)) {
160 /*
161 * For MIPS64 the virtual address may either be in one of
162 * the compatibility segments ckseg0 or ckseg1, or it may
163 * be in xkphys.
164 */
165 return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x);
166 }
167
168 if (!IS_ENABLED(CONFIG_EVA)) {
169 /*
170 * We're using the standard MIPS32 legacy memory map, ie.
171 * the address x is going to be in kseg0 or kseg1. We can
172 * handle either case by masking out the desired bits using
173 * CPHYSADDR.
174 */
175 return CPHYSADDR(x);
176 }
177
178 /*
179 * EVA is in use so the memory map could be anything, making it not
180 * safe to just mask out bits.
181 */
182 return x - PAGE_OFFSET + PHYS_OFFSET;
183}
184#define __pa(x) ___pa((unsigned long)(x))
185#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
186#include <asm/io.h>
187
188/*
189 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
190 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The
191 * discussion can be found in
192 * https://lore.kernel.org/lkml/a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com
193 *
194 * It is unclear if the misscompilations mentioned in
195 * https://lore.kernel.org/lkml/1281303490-390-1-git-send-email-namhyung@gmail.com
196 * also affect MIPS so we keep this one until GCC 3.x has been retired
197 * before we can apply https://patchwork.linux-mips.org/patch/1541/
198 */
199#define __pa_symbol_nodebug(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
200
201#ifdef CONFIG_DEBUG_VIRTUAL
202extern phys_addr_t __phys_addr_symbol(unsigned long x);
203#else
204#define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
205#endif
206
207#ifndef __pa_symbol
208#define __pa_symbol(x) __phys_addr_symbol((unsigned long)(x))
209#endif
210
211#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
212
213#define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr)))
214#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
215
216extern bool __virt_addr_valid(const volatile void *kaddr);
217#define virt_addr_valid(kaddr) \
218 __virt_addr_valid((const volatile void *) (kaddr))
219
220#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC
221
222extern unsigned long __kaslr_offset;
223static inline unsigned long kaslr_offset(void)
224{
225 return __kaslr_offset;
226}
227
228#include <asm-generic/memory_model.h>
229#include <asm-generic/getorder.h>
230
231#endif /* _ASM_PAGE_H */