include/asm-ppc/page.h

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