include/asm-ppc/page.h

   1 #ifndef _PPC_PAGE_H
   2 #define _PPC_PAGE_H
   3
   4 /* PAGE_SHIFT determines the page size */
   5 #define PAGE_SHIFT      12
   6 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
   7
   8 /*
   9  * Subtle: this is an int (not an unsigned long) and so it
  10  * gets extended to 64 bits the way want (i.e. with 1s).  -- paulus
  11  */
  12 #define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
  13
  14 #ifdef __KERNEL__
  15 #include <linux/config.h>
  16
  17 /* This must match what is in arch/ppc/Makefile */
  18 #define PAGE_OFFSET     CONFIG_KERNEL_START
  19 #define KERNELBASE      PAGE_OFFSET
  20
  21 #ifndef __ASSEMBLY__
  22
  23 /*
  24  * The basic type of a PTE - 64 bits for those CPUs with > 32 bit
  25  * physical addressing.  For now this just the IBM PPC440.
  26  */
  27 #ifdef CONFIG_PTE_64BIT
  28 typedef unsigned long long pte_basic_t;
  29 #define PTE_SHIFT       (PAGE_SHIFT - 3)        /* 512 ptes per page */
  30 #define PTE_FMT         "%16Lx"
  31 #else
  32 typedef unsigned long pte_basic_t;
  33 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  34 #define PTE_FMT         "%.8lx"
  35 #endif
  36
  37 #undef STRICT_MM_TYPECHECKS
  38
  39 #ifdef STRICT_MM_TYPECHECKS
  40 /*
  41  * These are used to make use of C type-checking..
  42  */
  43 typedef struct { pte_basic_t pte; } pte_t;
  44 typedef struct { unsigned long pmd; } pmd_t;
  45 typedef struct { unsigned long pgd; } pgd_t;
  46 typedef struct { unsigned long pgprot; } pgprot_t;
  47
  48 #define pte_val(x)      ((x).pte)
  49 #define pmd_val(x)      ((x).pmd)
  50 #define pgd_val(x)      ((x).pgd)
  51 #define pgprot_val(x)   ((x).pgprot)
  52
  53 #define __pte(x)        ((pte_t) { (x) } )
  54 #define __pmd(x)        ((pmd_t) { (x) } )
  55 #define __pgd(x)        ((pgd_t) { (x) } )
  56 #define __pgprot(x)     ((pgprot_t) { (x) } )
  57
  58 #else
  59 /*
  60  * .. while these make it easier on the compiler
  61  */
  62 typedef pte_basic_t pte_t;
  63 typedef unsigned long pmd_t;
  64 typedef unsigned long pgd_t;
  65 typedef unsigned long pgprot_t;
  66
  67 #define pte_val(x)      (x)
  68 #define pmd_val(x)      (x)
  69 #define pgd_val(x)      (x)
  70 #define pgprot_val(x)   (x)
  71
  72 #define __pte(x)        (x)
  73 #define __pmd(x)        (x)
  74 #define __pgd(x)        (x)
  75 #define __pgprot(x)     (x)
  76
  77 #endif
  78
  79
  80 /* align addr on a size boundary - adjust address up if needed -- Cort */
  81 #define _ALIGN(addr,size)       (((addr)+(size)-1)&(~((size)-1)))
  82
  83 /* to align the pointer to the (next) page boundary */
  84 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  85
  86 struct page;
  87 extern void clear_pages(void *page, int order);
  88 static inline void clear_page(void *page) { clear_pages(page, 0); }
  89 extern void copy_page(void *to, void *from);
  90 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
  91 extern void copy_user_page(void *to, void *from, unsigned long vaddr,
  92                            struct page *pg);
  93
  94 #ifndef CONFIG_APUS
  95 #define PPC_MEMSTART    0
  96 #define PPC_PGSTART     0
  97 #define PPC_MEMOFFSET   PAGE_OFFSET
  98 #else
  99 extern unsigned long ppc_memstart;
 100 extern unsigned long ppc_pgstart;
 101 extern unsigned long ppc_memoffset;
 102 #define PPC_MEMSTART    ppc_memstart
 103 #define PPC_PGSTART     ppc_pgstart
 104 #define PPC_MEMOFFSET   ppc_memoffset
 105 #endif
 106
 107 #if defined(CONFIG_APUS) && !defined(MODULE)
 108 /* map phys->virtual and virtual->phys for RAM pages */
 109 static inline unsigned long ___pa(unsigned long v)
 110 {
 111         unsigned long p;
 112         asm volatile ("1: addis %0, %1, %2;"
 113                       ".section \".vtop_fixup\",\"aw\";"
 114                       ".align  1;"
 115                       ".long   1b;"
 116                       ".previous;"
 117                       : "=r" (p)
 118                       : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
 119
 120         return p;
 121 }
 122 static inline void* ___va(unsigned long p)
 123 {
 124         unsigned long v;
 125         asm volatile ("1: addis %0, %1, %2;"
 126                       ".section \".ptov_fixup\",\"aw\";"
 127                       ".align  1;"
 128                       ".long   1b;"
 129                       ".previous;"
 130                       : "=r" (v)
 131                       : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
 132
 133         return (void*) v;
 134 }
 135 #else
 136 #define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)
 137 #define ___va(paddr) ((paddr)+PPC_MEMOFFSET)
 138 #endif
 139
 140 extern int page_is_ram(unsigned long pfn);
 141
 142 #define __pa(x) ___pa((unsigned long)(x))
 143 #define __va(x) ((void *)(___va((unsigned long)(x))))
 144
 145 #define pfn_to_page(pfn)        (mem_map + ((pfn) - PPC_PGSTART))
 146 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + PPC_PGSTART)
 147 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 148 #define page_to_virt(page)      __va(page_to_pfn(page) << PAGE_SHIFT)
 149
 150 #define pfn_valid(pfn)          (((pfn) - PPC_PGSTART) < max_mapnr)
 151 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 152
 153 /* Pure 2^n version of get_order */
 154 extern __inline__ int get_order(unsigned long size)
 155 {
 156         int lz;
 157
 158         size = (size-1) >> PAGE_SHIFT;
 159         asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
 160         return 32 - lz;
 161 }
 162
 163 #endif /* __ASSEMBLY__ */
 164
 165 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 166                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 167
 168 #endif /* __KERNEL__ */
 169 #endif /* _PPC_PAGE_H */