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Linux/arch/mips/include/asm/page.h

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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  */
 42 static 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 
 75 extern void build_clear_page(void);
 76 extern 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 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 84 extern unsigned long ARCH_PFN_OFFSET;
 85 # define ARCH_PFN_OFFSET        ARCH_PFN_OFFSET
 86 #else
 87 # define ARCH_PFN_OFFSET        PFN_UP(PHYS_OFFSET)
 88 #endif
 89 
 90 extern void clear_page(void * page);
 91 extern void copy_page(void * to, void * from);
 92 
 93 extern unsigned long shm_align_mask;
 94 
 95 static inline unsigned long pages_do_alias(unsigned long addr1,
 96         unsigned long addr2)
 97 {
 98         return (addr1 ^ addr2) & shm_align_mask;
 99 }
100 
101 struct page;
102 
103 static inline void clear_user_page(void *addr, unsigned long vaddr,
104         struct page *page)
105 {
106         extern void (*flush_data_cache_page)(unsigned long addr);
107 
108         clear_page(addr);
109         if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
110                 flush_data_cache_page((unsigned long)addr);
111 }
112 
113 struct vm_area_struct;
114 extern void copy_user_highpage(struct page *to, struct page *from,
115         unsigned long vaddr, struct vm_area_struct *vma);
116 
117 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
118 
119 /*
120  * These are used to make use of C type-checking..
121  */
122 #ifdef CONFIG_PHYS_ADDR_T_64BIT
123   #ifdef CONFIG_CPU_MIPS32
124     typedef struct { unsigned long pte_low, pte_high; } pte_t;
125     #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
126     #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
127   #else
128      typedef struct { unsigned long long pte; } pte_t;
129      #define pte_val(x) ((x).pte)
130      #define __pte(x)   ((pte_t) { (x) } )
131   #endif
132 #else
133 typedef struct { unsigned long pte; } pte_t;
134 #define pte_val(x)      ((x).pte)
135 #define __pte(x)        ((pte_t) { (x) } )
136 #endif
137 typedef struct page *pgtable_t;
138 
139 /*
140  * Right now we don't support 4-level pagetables, so all pud-related
141  * definitions come from <asm-generic/pgtable-nopud.h>.
142  */
143 
144 /*
145  * Finall the top of the hierarchy, the pgd
146  */
147 typedef struct { unsigned long pgd; } pgd_t;
148 #define pgd_val(x)      ((x).pgd)
149 #define __pgd(x)        ((pgd_t) { (x) } )
150 
151 /*
152  * Manipulate page protection bits
153  */
154 typedef struct { unsigned long pgprot; } pgprot_t;
155 #define pgprot_val(x)   ((x).pgprot)
156 #define __pgprot(x)     ((pgprot_t) { (x) } )
157 #define pte_pgprot(x)   __pgprot(pte_val(x) & ~_PFN_MASK)
158 
159 /*
160  * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
161  * pair of pages we only have a single global bit per pair of pages.  When
162  * writing to the TLB make sure we always have the bit set for both pages
163  * or none.  This macro is used to access the `buddy' of the pte we're just
164  * working on.
165  */
166 #define ptep_buddy(x)   ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
167 
168 /*
169  * __pa()/__va() should be used only during mem init.
170  */
171 static inline unsigned long ___pa(unsigned long x)
172 {
173         if (IS_ENABLED(CONFIG_64BIT)) {
174                 /*
175                  * For MIPS64 the virtual address may either be in one of
176                  * the compatibility segements ckseg0 or ckseg1, or it may
177                  * be in xkphys.
178                  */
179                 return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x);
180         }
181 
182         if (!IS_ENABLED(CONFIG_EVA)) {
183                 /*
184                  * We're using the standard MIPS32 legacy memory map, ie.
185                  * the address x is going to be in kseg0 or kseg1. We can
186                  * handle either case by masking out the desired bits using
187                  * CPHYSADDR.
188                  */
189                 return CPHYSADDR(x);
190         }
191 
192         /*
193          * EVA is in use so the memory map could be anything, making it not
194          * safe to just mask out bits.
195          */
196         return x - PAGE_OFFSET + PHYS_OFFSET;
197 }
198 #define __pa(x)         ___pa((unsigned long)(x))
199 #define __va(x)         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
200 #include <asm/io.h>
201 
202 /*
203  * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
204  * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org).  The
205  * discussion can be found in lkml posting
206  * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
207  * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
208  *
209  * It is unclear if the misscompilations mentioned in
210  * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
211  * until GCC 3.x has been retired before we can apply
212  * https://patchwork.linux-mips.org/patch/1541/
213  */
214 
215 #ifndef __pa_symbol
216 #define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
217 #endif
218 
219 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
220 
221 #ifdef CONFIG_FLATMEM
222 
223 static inline int pfn_valid(unsigned long pfn)
224 {
225         /* avoid <linux/mm.h> include hell */
226         extern unsigned long max_mapnr;
227         unsigned long pfn_offset = ARCH_PFN_OFFSET;
228 
229         return pfn >= pfn_offset && pfn < max_mapnr;
230 }
231 
232 #elif defined(CONFIG_SPARSEMEM)
233 
234 /* pfn_valid is defined in linux/mmzone.h */
235 
236 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
237 
238 #define pfn_valid(pfn)                                                  \
239 ({                                                                      \
240         unsigned long __pfn = (pfn);                                    \
241         int __n = pfn_to_nid(__pfn);                                    \
242         ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
243                                NODE_DATA(__n)->node_spanned_pages)      \
244                     : 0);                                               \
245 })
246 
247 #endif
248 
249 #define virt_to_pfn(kaddr)      PFN_DOWN(virt_to_phys((void *)(kaddr)))
250 #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
251 
252 extern bool __virt_addr_valid(const volatile void *kaddr);
253 #define virt_addr_valid(kaddr)                                          \
254         __virt_addr_valid((const volatile void *) (kaddr))
255 
256 #define VM_DATA_DEFAULT_FLAGS \
257         (VM_READ | VM_WRITE | \
258          ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
259          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
260 
261 #define UNCAC_ADDR(addr)        (UNCAC_BASE + __pa(addr))
262 #define CAC_ADDR(addr)          ((unsigned long)__va((addr) - UNCAC_BASE))
263 
264 #include <asm-generic/memory_model.h>
265 #include <asm-generic/getorder.h>
266 
267 #endif /* _ASM_PAGE_H */
268 

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