arch/sparc/include/asm/pgtsun4c.h

   1 /*
   2  * pgtsun4c.h:  Sun4c specific pgtable.h defines and code.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6 #ifndef _SPARC_PGTSUN4C_H
   7 #define _SPARC_PGTSUN4C_H
   8
   9 #include <asm/contregs.h>
  10
  11 /* PMD_SHIFT determines the size of the area a second-level page table can map */
  12 #define SUN4C_PMD_SHIFT       22
  13
  14 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  15 #define SUN4C_PGDIR_SHIFT       22
  16 #define SUN4C_PGDIR_SIZE        (1UL << SUN4C_PGDIR_SHIFT)
  17 #define SUN4C_PGDIR_MASK        (~(SUN4C_PGDIR_SIZE-1))
  18 #define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK)
  19
  20 /* To represent how the sun4c mmu really lays things out. */
  21 #define SUN4C_REAL_PGDIR_SHIFT       18
  22 #define SUN4C_REAL_PGDIR_SIZE        (1UL << SUN4C_REAL_PGDIR_SHIFT)
  23 #define SUN4C_REAL_PGDIR_MASK        (~(SUN4C_REAL_PGDIR_SIZE-1))
  24 #define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK)
  25
  26 /* 16 bit PFN on sun4c */
  27 #define SUN4C_PFN_MASK 0xffff
  28
  29 /* Don't increase these unless the structures in sun4c.c are fixed */
  30 #define SUN4C_MAX_SEGMAPS 256
  31 #define SUN4C_MAX_CONTEXTS 16
  32
  33 /*
  34  * To be efficient, and not have to worry about allocating such
  35  * a huge pgd, we make the kernel sun4c tables each hold 1024
  36  * entries and the pgd similarly just like the i386 tables.
  37  */
  38 #define SUN4C_PTRS_PER_PTE    1024
  39 #define SUN4C_PTRS_PER_PMD    1
  40 #define SUN4C_PTRS_PER_PGD    1024
  41
  42 /*
  43  * Sparc SUN4C pte fields.
  44  */
  45 #define _SUN4C_PAGE_VALID        0x80000000
  46 #define _SUN4C_PAGE_SILENT_READ  0x80000000   /* synonym */
  47 #define _SUN4C_PAGE_DIRTY        0x40000000
  48 #define _SUN4C_PAGE_SILENT_WRITE 0x40000000   /* synonym */
  49 #define _SUN4C_PAGE_PRIV         0x20000000   /* privileged page */
  50 #define _SUN4C_PAGE_NOCACHE      0x10000000   /* non-cacheable page */
  51 #define _SUN4C_PAGE_PRESENT      0x08000000   /* implemented in software */
  52 #define _SUN4C_PAGE_IO           0x04000000   /* I/O page */
  53 #define _SUN4C_PAGE_FILE         0x02000000   /* implemented in software */
  54 #define _SUN4C_PAGE_READ         0x00800000   /* implemented in software */
  55 #define _SUN4C_PAGE_WRITE        0x00400000   /* implemented in software */
  56 #define _SUN4C_PAGE_ACCESSED     0x00200000   /* implemented in software */
  57 #define _SUN4C_PAGE_MODIFIED     0x00100000   /* implemented in software */
  58
  59 #define _SUN4C_READABLE         (_SUN4C_PAGE_READ|_SUN4C_PAGE_SILENT_READ|\
  60                                  _SUN4C_PAGE_ACCESSED)
  61 #define _SUN4C_WRITEABLE        (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE|\
  62                                  _SUN4C_PAGE_MODIFIED)
  63
  64 #define _SUN4C_PAGE_CHG_MASK    (0xffff|_SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_MODIFIED)
  65
  66 #define SUN4C_PAGE_NONE         __pgprot(_SUN4C_PAGE_PRESENT)
  67 #define SUN4C_PAGE_SHARED       __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE|\
  68                                          _SUN4C_PAGE_WRITE)
  69 #define SUN4C_PAGE_COPY         __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
  70 #define SUN4C_PAGE_READONLY     __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
  71 #define SUN4C_PAGE_KERNEL       __pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\
  72                                          _SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV)
  73
  74 /* SUN4C swap entry encoding
  75  *
  76  * We use 5 bits for the type and 19 for the offset.  This gives us
  77  * 32 swapfiles of 4GB each.  Encoding looks like:
  78  *
  79  * RRRRRRRRooooooooooooooooooottttt
  80  * fedcba9876543210fedcba9876543210
  81  *
  82  * The top 8 bits are reserved for protection and status bits, especially
  83  * FILE and PRESENT.
  84  */
  85 #define SUN4C_SWP_TYPE_MASK     0x1f
  86 #define SUN4C_SWP_OFF_MASK      0x7ffff
  87 #define SUN4C_SWP_OFF_SHIFT     5
  88
  89 #ifndef __ASSEMBLY__
  90
  91 static inline unsigned long sun4c_get_synchronous_error(void)
  92 {
  93         unsigned long sync_err;
  94
  95         __asm__ __volatile__("lda [%1] %2, %0\n\t" :
  96                              "=r" (sync_err) :
  97                              "r" (AC_SYNC_ERR), "i" (ASI_CONTROL));
  98         return sync_err;
  99 }
 100
 101 static inline unsigned long sun4c_get_synchronous_address(void)
 102 {
 103         unsigned long sync_addr;
 104
 105         __asm__ __volatile__("lda [%1] %2, %0\n\t" :
 106                              "=r" (sync_addr) :
 107                              "r" (AC_SYNC_VA), "i" (ASI_CONTROL));
 108         return sync_addr;
 109 }
 110
 111 /* SUN4C pte, segmap, and context manipulation */
 112 static inline unsigned long sun4c_get_segmap(unsigned long addr)
 113 {
 114   register unsigned long entry;
 115
 116   __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
 117                        "=r" (entry) :
 118                        "r" (addr), "i" (ASI_SEGMAP));
 119
 120   return entry;
 121 }
 122
 123 static inline void sun4c_put_segmap(unsigned long addr, unsigned long entry)
 124 {
 125
 126   __asm__ __volatile__("\n\tstba %1, [%0] %2; nop; nop; nop;\n\t" : :
 127                        "r" (addr), "r" (entry),
 128                        "i" (ASI_SEGMAP)
 129                        : "memory");
 130 }
 131
 132 static inline unsigned long sun4c_get_pte(unsigned long addr)
 133 {
 134   register unsigned long entry;
 135
 136   __asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" :
 137                        "=r" (entry) :
 138                        "r" (addr), "i" (ASI_PTE));
 139   return entry;
 140 }
 141
 142 static inline void sun4c_put_pte(unsigned long addr, unsigned long entry)
 143 {
 144   __asm__ __volatile__("\n\tsta %1, [%0] %2; nop; nop; nop;\n\t" : :
 145                        "r" (addr),
 146                        "r" ((entry & ~(_SUN4C_PAGE_PRESENT))), "i" (ASI_PTE)
 147                        : "memory");
 148 }
 149
 150 static inline int sun4c_get_context(void)
 151 {
 152   register int ctx;
 153
 154   __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
 155                        "=r" (ctx) :
 156                        "r" (AC_CONTEXT), "i" (ASI_CONTROL));
 157
 158   return ctx;
 159 }
 160
 161 static inline int sun4c_set_context(int ctx)
 162 {
 163   __asm__ __volatile__("\n\tstba %0, [%1] %2; nop; nop; nop;\n\t" : :
 164                        "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL)
 165                        : "memory");
 166
 167   return ctx;
 168 }
 169
 170 #endif /* !(__ASSEMBLY__) */
 171
 172 #endif /* !(_SPARC_PGTSUN4C_H) */