LXR linux/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
  92static 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
 102static 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 */
 113static 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
 123static 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
 131static 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
 141static 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
 149static 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
 160static 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) */
 172