arch/sparc/include/asm/pgtsun4.h

   1 /*
   2  * pgtsun4.h:  Sun4 specific pgtable.h defines and code.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  */
   7 #ifndef _SPARC_PGTSUN4C_H
   8 #define _SPARC_PGTSUN4C_H
   9
  10 #include <asm/contregs.h>
  11
  12 /* PMD_SHIFT determines the size of the area a second-level page table can map */
  13 #define SUN4C_PMD_SHIFT       23
  14
  15 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  16 #define SUN4C_PGDIR_SHIFT       23
  17 #define SUN4C_PGDIR_SIZE        (1UL << SUN4C_PGDIR_SHIFT)
  18 #define SUN4C_PGDIR_MASK        (~(SUN4C_PGDIR_SIZE-1))
  19 #define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK)
  20
  21 /* To represent how the sun4c mmu really lays things out. */
  22 #define SUN4C_REAL_PGDIR_SHIFT       18
  23 #define SUN4C_REAL_PGDIR_SIZE        (1UL << SUN4C_REAL_PGDIR_SHIFT)
  24 #define SUN4C_REAL_PGDIR_MASK        (~(SUN4C_REAL_PGDIR_SIZE-1))
  25 #define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK)
  26
  27 /* 19 bit PFN on sun4 */
  28 #define SUN4C_PFN_MASK 0x7ffff
  29
  30 /* Don't increase these unless the structures in sun4c.c are fixed */
  31 #define SUN4C_MAX_SEGMAPS 256
  32 #define SUN4C_MAX_CONTEXTS 16
  33
  34 /*
  35  * To be efficient, and not have to worry about allocating such
  36  * a huge pgd, we make the kernel sun4c tables each hold 1024
  37  * entries and the pgd similarly just like the i386 tables.
  38  */
  39 #define SUN4C_PTRS_PER_PTE    1024
  40 #define SUN4C_PTRS_PER_PMD    1
  41 #define SUN4C_PTRS_PER_PGD    1024
  42
  43 /*
  44  * Sparc SUN4C pte fields.
  45  */
  46 #define _SUN4C_PAGE_VALID        0x80000000
  47 #define _SUN4C_PAGE_SILENT_READ  0x80000000   /* synonym */
  48 #define _SUN4C_PAGE_DIRTY        0x40000000
  49 #define _SUN4C_PAGE_SILENT_WRITE 0x40000000   /* synonym */
  50 #define _SUN4C_PAGE_PRIV         0x20000000   /* privileged page */
  51 #define _SUN4C_PAGE_NOCACHE      0x10000000   /* non-cacheable page */
  52 #define _SUN4C_PAGE_PRESENT      0x08000000   /* implemented in software */
  53 #define _SUN4C_PAGE_IO           0x04000000   /* I/O page */
  54 #define _SUN4C_PAGE_FILE         0x02000000   /* implemented in software */
  55 #define _SUN4C_PAGE_READ         0x00800000   /* implemented in software */
  56 #define _SUN4C_PAGE_WRITE        0x00400000   /* implemented in software */
  57 #define _SUN4C_PAGE_ACCESSED     0x00200000   /* implemented in software */
  58 #define _SUN4C_PAGE_MODIFIED     0x00100000   /* implemented in software */
  59
  60 #define _SUN4C_READABLE         (_SUN4C_PAGE_READ|_SUN4C_PAGE_SILENT_READ|\
  61                                  _SUN4C_PAGE_ACCESSED)
  62 #define _SUN4C_WRITEABLE        (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE|\
  63                                  _SUN4C_PAGE_MODIFIED)
  64
  65 #define _SUN4C_PAGE_CHG_MASK    (0xffff|_SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_MODIFIED)
  66
  67 #define SUN4C_PAGE_NONE         __pgprot(_SUN4C_PAGE_PRESENT)
  68 #define SUN4C_PAGE_SHARED       __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE|\
  69                                          _SUN4C_PAGE_WRITE)
  70 #define SUN4C_PAGE_COPY         __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
  71 #define SUN4C_PAGE_READONLY     __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
  72 #define SUN4C_PAGE_KERNEL       __pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\
  73                                          _SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV)
  74
  75 /* SUN4C swap entry encoding
  76  *
  77  * We use 5 bits for the type and 19 for the offset.  This gives us
  78  * 32 swapfiles of 4GB each.  Encoding looks like:
  79  *
  80  * RRRRRRRRooooooooooooooooooottttt
  81  * fedcba9876543210fedcba9876543210
  82  *
  83  * The top 8 bits are reserved for protection and status bits, especially
  84  * FILE and PRESENT.
  85  */
  86 #define SUN4C_SWP_TYPE_MASK     0x1f
  87 #define SUN4C_SWP_OFF_MASK      0x7ffff
  88 #define SUN4C_SWP_OFF_SHIFT     5
  89
  90 #ifndef __ASSEMBLY__
  91
  92 static inline unsigned long sun4c_get_synchronous_error(void)
  93 {
  94         unsigned long sync_err;
  95
  96         __asm__ __volatile__("lda [%1] %2, %0\n\t" :
  97                              "=r" (sync_err) :
  98                              "r" (AC_SYNC_ERR), "i" (ASI_CONTROL));
  99         return sync_err;
 100 }
 101
 102 static inline unsigned long sun4c_get_synchronous_address(void)
 103 {
 104         unsigned long sync_addr;
 105
 106         __asm__ __volatile__("lda [%1] %2, %0\n\t" :
 107                              "=r" (sync_addr) :
 108                              "r" (AC_SYNC_VA), "i" (ASI_CONTROL));
 109         return sync_addr;
 110 }
 111
 112 /* SUN4 pte, segmap, and context manipulation */
 113 static inline unsigned long sun4c_get_segmap(unsigned long addr)
 114 {
 115   register unsigned long entry;
 116
 117   __asm__ __volatile__("\n\tlduha [%1] %2, %0\n\t" :
 118                        "=r" (entry) :
 119                        "r" (addr), "i" (ASI_SEGMAP));
 120   return entry;
 121 }
 122
 123 static inline void sun4c_put_segmap(unsigned long addr, unsigned long entry)
 124 {
 125   __asm__ __volatile__("\n\tstha %1, [%0] %2; nop; nop; nop;\n\t" : :
 126                        "r" (addr), "r" (entry),
 127                        "i" (ASI_SEGMAP)
 128                        : "memory");
 129 }
 130
 131 static inline unsigned long sun4c_get_pte(unsigned long addr)
 132 {
 133   register unsigned long entry;
 134
 135   __asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" :
 136                        "=r" (entry) :
 137                        "r" (addr), "i" (ASI_PTE));
 138   return entry;
 139 }
 140
 141 static inline void sun4c_put_pte(unsigned long addr, unsigned long entry)
 142 {
 143   __asm__ __volatile__("\n\tsta %1, [%0] %2; nop; nop; nop;\n\t" : :
 144                        "r" (addr),
 145                        "r" ((entry & ~(_SUN4C_PAGE_PRESENT))), "i" (ASI_PTE)
 146                        : "memory");
 147 }
 148
 149 static inline int sun4c_get_context(void)
 150 {
 151   register int ctx;
 152
 153   __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
 154                        "=r" (ctx) :
 155                        "r" (AC_CONTEXT), "i" (ASI_CONTROL));
 156
 157   return ctx;
 158 }
 159
 160 static inline int sun4c_set_context(int ctx)
 161 {
 162   __asm__ __volatile__("\n\tstba %0, [%1] %2; nop; nop; nop;\n\t" : :
 163                        "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL)
 164                        : "memory");
 165
 166   return ctx;
 167 }
 168
 169 #endif /* !(__ASSEMBLY__) */
 170
 171 #endif /* !(_SPARC_PGTSUN4_H) */