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