arch/metag/include/asm/page.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _METAG_PAGE_H
   3 #define _METAG_PAGE_H
   4
   5 #include <linux/const.h>
   6
   7 #include <asm/metag_mem.h>
   8
   9 /* PAGE_SHIFT determines the page size */
  10 #if defined(CONFIG_PAGE_SIZE_4K)
  11 #define PAGE_SHIFT      12
  12 #elif defined(CONFIG_PAGE_SIZE_8K)
  13 #define PAGE_SHIFT      13
  14 #elif defined(CONFIG_PAGE_SIZE_16K)
  15 #define PAGE_SHIFT      14
  16 #endif
  17
  18 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  19 #define PAGE_MASK       (~(PAGE_SIZE-1))
  20
  21 #if defined(CONFIG_HUGETLB_PAGE_SIZE_8K)
  22 # define HPAGE_SHIFT    13
  23 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_16K)
  24 # define HPAGE_SHIFT    14
  25 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_32K)
  26 # define HPAGE_SHIFT    15
  27 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  28 # define HPAGE_SHIFT    16
  29 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_128K)
  30 # define HPAGE_SHIFT    17
  31 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  32 # define HPAGE_SHIFT    18
  33 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
  34 # define HPAGE_SHIFT    19
  35 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1M)
  36 # define HPAGE_SHIFT    20
  37 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_2M)
  38 # define HPAGE_SHIFT    21
  39 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4M)
  40 # define HPAGE_SHIFT    22
  41 #endif
  42
  43 #ifdef CONFIG_HUGETLB_PAGE
  44 # define HPAGE_SIZE             (1UL << HPAGE_SHIFT)
  45 # define HPAGE_MASK             (~(HPAGE_SIZE-1))
  46 # define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT-PAGE_SHIFT)
  47 /*
  48  * We define our own hugetlb_get_unmapped_area so we don't corrupt 2nd level
  49  * page tables with normal pages in them.
  50  */
  51 # define HUGEPT_SHIFT           (22)
  52 # define HUGEPT_ALIGN           (1 << HUGEPT_SHIFT)
  53 # define HUGEPT_MASK            (HUGEPT_ALIGN - 1)
  54 # define ALIGN_HUGEPT(x)        ALIGN(x, HUGEPT_ALIGN)
  55 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  56 #endif
  57
  58 #ifndef __ASSEMBLY__
  59
  60 /* On the Meta, we would like to know if the address (heap) we have is
  61  * in local or global space.
  62  */
  63 #define is_global_space(addr)   ((addr) > 0x7fffffff)
  64 #define is_local_space(addr)    (!is_global_space(addr))
  65
  66 extern void clear_page(void *to);
  67 extern void copy_page(void *to, void *from);
  68
  69 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  70 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  71
  72 /*
  73  * These are used to make use of C type-checking..
  74  */
  75 typedef struct { unsigned long pte; } pte_t;
  76 typedef struct { unsigned long pgd; } pgd_t;
  77 typedef struct { unsigned long pgprot; } pgprot_t;
  78 typedef struct page *pgtable_t;
  79
  80 #define pte_val(x)      ((x).pte)
  81 #define pgd_val(x)      ((x).pgd)
  82 #define pgprot_val(x)   ((x).pgprot)
  83
  84 #define __pte(x)        ((pte_t) { (x) })
  85 #define __pgd(x)        ((pgd_t) { (x) })
  86 #define __pgprot(x)     ((pgprot_t) { (x) })
  87
  88 /* The kernel must now ALWAYS live at either 0xC0000000 or 0x40000000 - that
  89  * being either global or local space.
  90  */
  91 #define PAGE_OFFSET             (CONFIG_PAGE_OFFSET)
  92
  93 #if PAGE_OFFSET >= LINGLOBAL_BASE
  94 #define META_MEMORY_BASE  LINGLOBAL_BASE
  95 #define META_MEMORY_LIMIT LINGLOBAL_LIMIT
  96 #else
  97 #define META_MEMORY_BASE  LINLOCAL_BASE
  98 #define META_MEMORY_LIMIT LINLOCAL_LIMIT
  99 #endif
 100
 101 /* Offset between physical and virtual mapping of kernel memory. */
 102 extern unsigned int meta_memoffset;
 103
 104 #define __pa(x) ((unsigned long)(((unsigned long)(x)) - meta_memoffset))
 105 #define __va(x) ((void *)((unsigned long)(((unsigned long)(x)) + meta_memoffset)))
 106
 107 extern unsigned long pfn_base;
 108 #define ARCH_PFN_OFFSET         (pfn_base)
 109 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 110 #define page_to_virt(page)      __va(page_to_pfn(page) << PAGE_SHIFT)
 111 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 112 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 113 #ifdef CONFIG_FLATMEM
 114 extern unsigned long max_pfn;
 115 extern unsigned long min_low_pfn;
 116 #define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_pfn)
 117 #endif
 118
 119 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 120
 121 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 122                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 123
 124 #include <asm-generic/memory_model.h>
 125 #include <asm-generic/getorder.h>
 126
 127 #endif /* __ASSMEBLY__ */
 128
 129 #endif /* _METAG_PAGE_H */