include/asm-ppc/page.h

   1 #ifndef _PPC_PAGE_H
   2 #define _PPC_PAGE_H
   3
   4 #include <linux/config.h>
   5 #include <asm/asm-compat.h>
   6
   7 /* PAGE_SHIFT determines the page size */
   8 #define PAGE_SHIFT      12
   9 #define PAGE_SIZE       (ASM_CONST(1) << PAGE_SHIFT)
  10
  11 /*
  12  * Subtle: this is an int (not an unsigned long) and so it
  13  * gets extended to 64 bits the way want (i.e. with 1s).  -- paulus
  14  */
  15 #define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
  16
  17 #ifdef __KERNEL__
  18 #include <linux/config.h>
  19
  20 /* This must match what is in arch/ppc/Makefile */
  21 #define PAGE_OFFSET     CONFIG_KERNEL_START
  22 #define KERNELBASE      PAGE_OFFSET
  23
  24 #ifndef __ASSEMBLY__
  25
  26 /*
  27  * The basic type of a PTE - 64 bits for those CPUs with > 32 bit
  28  * physical addressing.  For now this just the IBM PPC440.
  29  */
  30 #ifdef CONFIG_PTE_64BIT
  31 typedef unsigned long long pte_basic_t;
  32 #define PTE_SHIFT       (PAGE_SHIFT - 3)        /* 512 ptes per page */
  33 #define PTE_FMT         "%16Lx"
  34 #else
  35 typedef unsigned long pte_basic_t;
  36 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  37 #define PTE_FMT         "%.8lx"
  38 #endif
  39
  40 /* align addr on a size boundary - adjust address up/down if needed */
  41 #define _ALIGN_UP(addr,size)    (((addr)+((size)-1))&(~((size)-1)))
  42 #define _ALIGN_DOWN(addr,size)  ((addr)&(~((size)-1)))
  43
  44 /* align addr on a size boundary - adjust address up if needed */
  45 #define _ALIGN(addr,size)     _ALIGN_UP(addr,size)
  46
  47 /* to align the pointer to the (next) page boundary */
  48 #define PAGE_ALIGN(addr)        _ALIGN(addr, PAGE_SIZE)
  49
  50
  51 #undef STRICT_MM_TYPECHECKS
  52
  53 #ifdef STRICT_MM_TYPECHECKS
  54 /*
  55  * These are used to make use of C type-checking..
  56  */
  57 typedef struct { pte_basic_t pte; } pte_t;
  58 typedef struct { unsigned long pmd; } pmd_t;
  59 typedef struct { unsigned long pgd; } pgd_t;
  60 typedef struct { unsigned long pgprot; } pgprot_t;
  61
  62 #define pte_val(x)      ((x).pte)
  63 #define pmd_val(x)      ((x).pmd)
  64 #define pgd_val(x)      ((x).pgd)
  65 #define pgprot_val(x)   ((x).pgprot)
  66
  67 #define __pte(x)        ((pte_t) { (x) } )
  68 #define __pmd(x)        ((pmd_t) { (x) } )
  69 #define __pgd(x)        ((pgd_t) { (x) } )
  70 #define __pgprot(x)     ((pgprot_t) { (x) } )
  71
  72 #else
  73 /*
  74  * .. while these make it easier on the compiler
  75  */
  76 typedef pte_basic_t pte_t;
  77 typedef unsigned long pmd_t;
  78 typedef unsigned long pgd_t;
  79 typedef unsigned long pgprot_t;
  80
  81 #define pte_val(x)      (x)
  82 #define pmd_val(x)      (x)
  83 #define pgd_val(x)      (x)
  84 #define pgprot_val(x)   (x)
  85
  86 #define __pte(x)        (x)
  87 #define __pmd(x)        (x)
  88 #define __pgd(x)        (x)
  89 #define __pgprot(x)     (x)
  90
  91 #endif
  92
  93 struct page;
  94 extern void clear_pages(void *page, int order);
  95 static inline void clear_page(void *page) { clear_pages(page, 0); }
  96 extern void copy_page(void *to, void *from);
  97 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
  98 extern void copy_user_page(void *to, void *from, unsigned long vaddr,
  99                            struct page *pg);
 100
 101 #ifndef CONFIG_APUS
 102 #define PPC_MEMSTART    0
 103 #define PPC_PGSTART     0
 104 #define PPC_MEMOFFSET   PAGE_OFFSET
 105 #else
 106 extern unsigned long ppc_memstart;
 107 extern unsigned long ppc_pgstart;
 108 extern unsigned long ppc_memoffset;
 109 #define PPC_MEMSTART    ppc_memstart
 110 #define PPC_PGSTART     ppc_pgstart
 111 #define PPC_MEMOFFSET   ppc_memoffset
 112 #endif
 113
 114 #if defined(CONFIG_APUS) && !defined(MODULE)
 115 /* map phys->virtual and virtual->phys for RAM pages */
 116 static inline unsigned long ___pa(unsigned long v)
 117 {
 118         unsigned long p;
 119         asm volatile ("1: addis %0, %1, %2;"
 120                       ".section \".vtop_fixup\",\"aw\";"
 121                       ".align  1;"
 122                       ".long   1b;"
 123                       ".previous;"
 124                       : "=r" (p)
 125                       : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
 126
 127         return p;
 128 }
 129 static inline void* ___va(unsigned long p)
 130 {
 131         unsigned long v;
 132         asm volatile ("1: addis %0, %1, %2;"
 133                       ".section \".ptov_fixup\",\"aw\";"
 134                       ".align  1;"
 135                       ".long   1b;"
 136                       ".previous;"
 137                       : "=r" (v)
 138                       : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
 139
 140         return (void*) v;
 141 }
 142 #else
 143 #define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)
 144 #define ___va(paddr) ((paddr)+PPC_MEMOFFSET)
 145 #endif
 146
 147 extern int page_is_ram(unsigned long pfn);
 148
 149 #define __pa(x) ___pa((unsigned long)(x))
 150 #define __va(x) ((void *)(___va((unsigned long)(x))))
 151
 152 #define pfn_to_page(pfn)        (mem_map + ((pfn) - PPC_PGSTART))
 153 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + PPC_PGSTART)
 154 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 155 #define page_to_virt(page)      __va(page_to_pfn(page) << PAGE_SHIFT)
 156
 157 #define pfn_valid(pfn)          (((pfn) - PPC_PGSTART) < max_mapnr)
 158 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 159
 160 /* Pure 2^n version of get_order */
 161 extern __inline__ int get_order(unsigned long size)
 162 {
 163         int lz;
 164
 165         size = (size-1) >> PAGE_SHIFT;
 166         asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
 167         return 32 - lz;
 168 }
 169
 170 #endif /* __ASSEMBLY__ */
 171
 172 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 173                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 174
 175 /* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
 176 #define __HAVE_ARCH_GATE_AREA           1
 177
 178 #endif /* __KERNEL__ */
 179 #endif /* _PPC_PAGE_H */