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 #ifndef CONFIG_APUS
 101 #define PPC_MEMSTART    0
 102 #define PPC_PGSTART     0
 103 #define PPC_MEMOFFSET   PAGE_OFFSET
 104 #else
 105 extern unsigned long ppc_memstart;
 106 extern unsigned long ppc_pgstart;
 107 extern unsigned long ppc_memoffset;
 108 #define PPC_MEMSTART    ppc_memstart
 109 #define PPC_PGSTART     ppc_pgstart
 110 #define PPC_MEMOFFSET   ppc_memoffset
 111 #endif
 112
 113 #if defined(CONFIG_APUS) && !defined(MODULE)
 114 /* map phys->virtual and virtual->phys for RAM pages */
 115 static inline unsigned long ___pa(unsigned long v)
 116 {
 117         unsigned long p;
 118         asm volatile ("1: addis %0, %1, %2;"
 119                       ".section \".vtop_fixup\",\"aw\";"
 120                       ".align  1;"
 121                       ".long   1b;"
 122                       ".previous;"
 123                       : "=r" (p)
 124                       : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
 125
 126         return p;
 127 }
 128 static inline void* ___va(unsigned long p)
 129 {
 130         unsigned long v;
 131         asm volatile ("1: addis %0, %1, %2;"
 132                       ".section \".ptov_fixup\",\"aw\";"
 133                       ".align  1;"
 134                       ".long   1b;"
 135                       ".previous;"
 136                       : "=r" (v)
 137                       : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
 138
 139         return (void*) v;
 140 }
 141 #else
 142 #define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)
 143 #define ___va(paddr) ((paddr)+PPC_MEMOFFSET)
 144 #endif
 145
 146 extern int page_is_ram(unsigned long pfn);
 147
 148 #define __pa(x) ___pa((unsigned long)(x))
 149 #define __va(x) ((void *)(___va((unsigned long)(x))))
 150
 151 #define ARCH_PFN_OFFSET         (PPC_PGSTART)
 152 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 153 #define page_to_virt(page)      __va(page_to_pfn(page) << PAGE_SHIFT)
 154
 155 #define pfn_valid(pfn)          (((pfn) - PPC_PGSTART) < max_mapnr)
 156 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 157
 158 /* Pure 2^n version of get_order */
 159 extern __inline__ int get_order(unsigned long size)
 160 {
 161         int lz;
 162
 163         size = (size-1) >> PAGE_SHIFT;
 164         asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
 165         return 32 - lz;
 166 }
 167
 168 #endif /* __ASSEMBLY__ */
 169
 170 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 171                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 172
 173 /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
 174 #define __HAVE_ARCH_GATE_AREA           1
 175
 176 #include <asm-generic/memory_model.h>
 177 #endif /* __KERNEL__ */
 178 #endif /* _PPC_PAGE_H */