include/asm-sparc/pgtsun4.h

   1 /* $Id: pgtsun4.h,v 1.5 2000/06/05 06:08:46 anton Exp $
   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 #define SUN4C_PMD_SIZE        (1UL << SUN4C_PMD_SHIFT)
  15 #define SUN4C_PMD_MASK        (~(SUN4C_PMD_SIZE-1))
  16 #define SUN4C_PMD_ALIGN(addr) (((addr)+SUN4C_PMD_SIZE-1)&SUN4C_PMD_MASK)
  17
  18 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  19 #define SUN4C_PGDIR_SHIFT       23
  20 #define SUN4C_PGDIR_SIZE        (1UL << SUN4C_PGDIR_SHIFT)
  21 #define SUN4C_PGDIR_MASK        (~(SUN4C_PGDIR_SIZE-1))
  22 #define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK)
  23
  24 /* To represent how the sun4c mmu really lays things out. */
  25 #define SUN4C_REAL_PGDIR_SHIFT       18
  26 #define SUN4C_REAL_PGDIR_SIZE        (1UL << SUN4C_REAL_PGDIR_SHIFT)
  27 #define SUN4C_REAL_PGDIR_MASK        (~(SUN4C_REAL_PGDIR_SIZE-1))
  28 #define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK)
  29
  30 /* 19 bit PFN on sun4 */
  31 #define SUN4C_PFN_MASK 0x7ffff
  32
  33 /* Don't increase these unless the structures in sun4c.c are fixed */
  34 #define SUN4C_MAX_SEGMAPS 256
  35 #define SUN4C_MAX_CONTEXTS 16
  36
  37 /*
  38  * To be efficient, and not have to worry about allocating such
  39  * a huge pgd, we make the kernel sun4c tables each hold 1024
  40  * entries and the pgd similarly just like the i386 tables.
  41  */
  42 #define SUN4C_PTRS_PER_PTE    1024
  43 #define SUN4C_PTRS_PER_PMD    1
  44 #define SUN4C_PTRS_PER_PGD    1024
  45
  46 /*
  47  * Sparc SUN4C pte fields.
  48  */
  49 #define _SUN4C_PAGE_VALID        0x80000000
  50 #define _SUN4C_PAGE_SILENT_READ  0x80000000   /* synonym */
  51 #define _SUN4C_PAGE_DIRTY        0x40000000
  52 #define _SUN4C_PAGE_SILENT_WRITE 0x40000000   /* synonym */
  53 #define _SUN4C_PAGE_PRIV         0x20000000   /* privileged page */
  54 #define _SUN4C_PAGE_NOCACHE      0x10000000   /* non-cacheable page */
  55 #define _SUN4C_PAGE_PRESENT      0x08000000   /* implemented in software */
  56 #define _SUN4C_PAGE_IO           0x04000000   /* I/O page */
  57 #define _SUN4C_PAGE_READ         0x00800000   /* implemented in software */
  58 #define _SUN4C_PAGE_WRITE        0x00400000   /* implemented in software */
  59 #define _SUN4C_PAGE_ACCESSED     0x00200000   /* implemented in software */
  60 #define _SUN4C_PAGE_MODIFIED     0x00100000   /* implemented in software */
  61
  62 #define _SUN4C_READABLE         (_SUN4C_PAGE_READ|_SUN4C_PAGE_SILENT_READ|\
  63                                  _SUN4C_PAGE_ACCESSED)
  64 #define _SUN4C_WRITEABLE        (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE|\
  65                                  _SUN4C_PAGE_MODIFIED)
  66
  67 #define _SUN4C_PAGE_CHG_MASK    (0xffff|_SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_MODIFIED)
  68
  69 #define SUN4C_PAGE_NONE         __pgprot(_SUN4C_PAGE_PRESENT)
  70 #define SUN4C_PAGE_SHARED       __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE|\
  71                                          _SUN4C_PAGE_WRITE)
  72 #define SUN4C_PAGE_COPY         __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
  73 #define SUN4C_PAGE_READONLY     __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
  74 #define SUN4C_PAGE_KERNEL       __pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\
  75                                          _SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV)
  76
  77 #ifndef __ASSEMBLY__
  78
  79 extern __inline__ unsigned long sun4c_get_synchronous_error(void)
  80 {
  81         unsigned long sync_err;
  82
  83         __asm__ __volatile__("lda [%1] %2, %0\n\t" :
  84                              "=r" (sync_err) :
  85                              "r" (AC_SYNC_ERR), "i" (ASI_CONTROL));
  86         return sync_err;
  87 }
  88
  89 extern __inline__ unsigned long sun4c_get_synchronous_address(void)
  90 {
  91         unsigned long sync_addr;
  92
  93         __asm__ __volatile__("lda [%1] %2, %0\n\t" :
  94                              "=r" (sync_addr) :
  95                              "r" (AC_SYNC_VA), "i" (ASI_CONTROL));
  96         return sync_addr;
  97 }
  98
  99 /* SUN4 pte, segmap, and context manipulation */
 100 extern __inline__ unsigned long sun4c_get_segmap(unsigned long addr)
 101 {
 102   register unsigned long entry;
 103
 104   __asm__ __volatile__("\n\tlduha [%1] %2, %0\n\t" :
 105                        "=r" (entry) :
 106                        "r" (addr), "i" (ASI_SEGMAP));
 107   return entry;
 108 }
 109
 110 extern __inline__ void sun4c_put_segmap(unsigned long addr, unsigned long entry)
 111 {
 112   __asm__ __volatile__("\n\tstha %1, [%0] %2; nop; nop; nop;\n\t" : :
 113                        "r" (addr), "r" (entry),
 114                        "i" (ASI_SEGMAP));
 115 }
 116
 117 extern __inline__ unsigned long sun4c_get_pte(unsigned long addr)
 118 {
 119   register unsigned long entry;
 120
 121   __asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" :
 122                        "=r" (entry) :
 123                        "r" (addr), "i" (ASI_PTE));
 124   return entry;
 125 }
 126
 127 extern __inline__ void sun4c_put_pte(unsigned long addr, unsigned long entry)
 128 {
 129   __asm__ __volatile__("\n\tsta %1, [%0] %2; nop; nop; nop;\n\t" : :
 130                        "r" (addr),
 131                        "r" ((entry & ~(_SUN4C_PAGE_PRESENT))), "i" (ASI_PTE));
 132 }
 133
 134 extern __inline__ int sun4c_get_context(void)
 135 {
 136   register int ctx;
 137
 138   __asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
 139                        "=r" (ctx) :
 140                        "r" (AC_CONTEXT), "i" (ASI_CONTROL));
 141
 142   return ctx;
 143 }
 144
 145 extern __inline__ int sun4c_set_context(int ctx)
 146 {
 147   __asm__ __volatile__("\n\tstba %0, [%1] %2; nop; nop; nop;\n\t" : :
 148                        "r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL));
 149
 150   return ctx;
 151 }
 152
 153 #endif /* !(__ASSEMBLY__) */
 154
 155 #endif /* !(_SPARC_PGTSUN4_H) */