include/asm-sparc64/page.h

   1 /* $Id: page.h,v 1.39 2002/02/09 19:49:31 davem Exp $ */
   2
   3 #ifndef _SPARC64_PAGE_H
   4 #define _SPARC64_PAGE_H
   5
   6 #include <linux/config.h>
   7 #include <asm/const.h>
   8
   9 #if defined(CONFIG_SPARC64_PAGE_SIZE_8KB)
  10 #define PAGE_SHIFT   13
  11 #elif defined(CONFIG_SPARC64_PAGE_SIZE_64KB)
  12 #define PAGE_SHIFT   16
  13 #elif defined(CONFIG_SPARC64_PAGE_SIZE_512KB)
  14 #define PAGE_SHIFT   19
  15 #elif defined(CONFIG_SPARC64_PAGE_SIZE_4MB)
  16 #define PAGE_SHIFT   22
  17 #else
  18 #error No page size specified in kernel configuration
  19 #endif
  20
  21 #define PAGE_SIZE    (_AC(1,UL) << PAGE_SHIFT)
  22 #define PAGE_MASK    (~(PAGE_SIZE-1))
  23
  24 #ifdef __KERNEL__
  25
  26 #ifndef __ASSEMBLY__
  27
  28 extern void _clear_page(void *page);
  29 #define clear_page(X)   _clear_page((void *)(X))
  30 struct page;
  31 extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
  32 #define copy_page(X,Y)  memcpy((void *)(X), (void *)(Y), PAGE_SIZE)
  33 extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *topage);
  34
  35 /* Unlike sparc32, sparc64's parameter passing API is more
  36  * sane in that structures which as small enough are passed
  37  * in registers instead of on the stack.  Thus, setting
  38  * STRICT_MM_TYPECHECKS does not generate worse code so
  39  * let's enable it to get the type checking.
  40  */
  41
  42 #define STRICT_MM_TYPECHECKS
  43
  44 #ifdef STRICT_MM_TYPECHECKS
  45 /* These are used to make use of C type-checking.. */
  46 typedef struct { unsigned long pte; } pte_t;
  47 typedef struct { unsigned long iopte; } iopte_t;
  48 typedef struct { unsigned int pmd; } pmd_t;
  49 typedef struct { unsigned int pgd; } pgd_t;
  50 typedef struct { unsigned long pgprot; } pgprot_t;
  51
  52 #define pte_val(x)      ((x).pte)
  53 #define iopte_val(x)    ((x).iopte)
  54 #define pmd_val(x)      ((x).pmd)
  55 #define pgd_val(x)      ((x).pgd)
  56 #define pgprot_val(x)   ((x).pgprot)
  57
  58 #define __pte(x)        ((pte_t) { (x) } )
  59 #define __iopte(x)      ((iopte_t) { (x) } )
  60 #define __pmd(x)        ((pmd_t) { (x) } )
  61 #define __pgd(x)        ((pgd_t) { (x) } )
  62 #define __pgprot(x)     ((pgprot_t) { (x) } )
  63
  64 #else
  65 /* .. while these make it easier on the compiler */
  66 typedef unsigned long pte_t;
  67 typedef unsigned long iopte_t;
  68 typedef unsigned int pmd_t;
  69 typedef unsigned int pgd_t;
  70 typedef unsigned long pgprot_t;
  71
  72 #define pte_val(x)      (x)
  73 #define iopte_val(x)    (x)
  74 #define pmd_val(x)      (x)
  75 #define pgd_val(x)      (x)
  76 #define pgprot_val(x)   (x)
  77
  78 #define __pte(x)        (x)
  79 #define __iopte(x)      (x)
  80 #define __pmd(x)        (x)
  81 #define __pgd(x)        (x)
  82 #define __pgprot(x)     (x)
  83
  84 #endif /* (STRICT_MM_TYPECHECKS) */
  85
  86 #if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  87 #define HPAGE_SHIFT             22
  88 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
  89 #define HPAGE_SHIFT             19
  90 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  91 #define HPAGE_SHIFT             16
  92 #endif
  93
  94 #ifdef CONFIG_HUGETLB_PAGE
  95 #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  96 #define HPAGE_MASK              (~(HPAGE_SIZE - 1UL))
  97 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  98 #endif
  99
 100 #define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_32BIT) ? \
 101                                  (_AC(0x0000000070000000,UL)) : (PAGE_OFFSET))
 102
 103 #endif /* !(__ASSEMBLY__) */
 104
 105 /* to align the pointer to the (next) page boundary */
 106 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 107
 108 /* We used to stick this into a hard-coded global register (%g4)
 109  * but that does not make sense anymore.
 110  */
 111 #define PAGE_OFFSET             _AC(0xFFFFF80000000000,UL)
 112
 113 #ifndef __ASSEMBLY__
 114
 115 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
 116 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 117
 118 /* PFNs are real physical page numbers.  However, mem_map only begins to record
 119  * per-page information starting at pfn_base.  This is to handle systems where
 120  * the first physical page in the machine is at some huge physical address,
 121  * such as 4GB.   This is common on a partitioned E10000, for example.
 122  */
 123 extern struct page *pfn_to_page(unsigned long pfn);
 124 extern unsigned long page_to_pfn(struct page *);
 125
 126 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
 127
 128 #define pfn_valid(pfn)          (((pfn)-(pfn_base)) < max_mapnr)
 129 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 130
 131 #define virt_to_phys __pa
 132 #define phys_to_virt __va
 133
 134 /* The following structure is used to hold the physical
 135  * memory configuration of the machine.  This is filled in
 136  * probe_memory() and is later used by mem_init() to set up
 137  * mem_map[].  We statically allocate SPARC_PHYS_BANKS of
 138  * these structs, this is arbitrary.  The entry after the
 139  * last valid one has num_bytes==0.
 140  */
 141
 142 struct sparc_phys_banks {
 143         unsigned long base_addr;
 144         unsigned long num_bytes;
 145 };
 146
 147 #define SPARC_PHYS_BANKS 32
 148
 149 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS];
 150
 151 /* Pure 2^n version of get_order */
 152 static __inline__ int get_order(unsigned long size)
 153 {
 154         int order;
 155
 156         size = (size-1) >> (PAGE_SHIFT-1);
 157         order = -1;
 158         do {
 159                 size >>= 1;
 160                 order++;
 161         } while (size);
 162         return order;
 163 }
 164
 165 #endif /* !(__ASSEMBLY__) */
 166
 167 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 168                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 169
 170 #endif /* !(__KERNEL__) */
 171
 172 #endif /* !(_SPARC64_PAGE_H) */