include/asm-m68k/sun3mmu.h

   1 /*
   2  * Definitions for Sun3 custom MMU.
   3  */
   4 #ifndef __SUN3_MMU_H__
   5 #define __SUN3_MMU_H__
   6
   7 #include <asm/movs.h>
   8 #include <asm/sun3-head.h>
   9
  10 /* MMU characteristics. */
  11 #define SUN3_SEGMAPS_PER_CONTEXT        2048
  12 #define SUN3_PMEGS_NUM                  256
  13 #define SUN3_CONTEXTS_NUM               8
  14
  15 #define SUN3_PMEG_SIZE_BITS      17
  16 #define SUN3_PMEG_SIZE           (1 << SUN3_PMEG_SIZE_BITS)
  17 #define SUN3_PMEG_MASK           (SUN3_PMEG_SIZE - 1)
  18
  19 #define SUN3_PTE_SIZE_BITS       13
  20 #define SUN3_PTE_SIZE            (1 << SUN3_PTE_SIZE_BITS)
  21 #define SUN3_PTE_MASK            (SUN3_PTE_SIZE - 1)
  22
  23 #define SUN3_CONTROL_MASK       (0x0FFFFFFC)
  24 #define SUN3_INVALID_PMEG       255
  25 #define SUN3_INVALID_CONTEXT 255
  26
  27 #define AC_IDPROM     0x00000000    /* 34  ID PROM, R/O, byte, 32 bytes      */
  28 #define AC_PAGEMAP    0x10000000    /* 3   Pagemap R/W, long                 */
  29 #define AC_SEGMAP     0x20000000    /* 3   Segment map, byte                 */
  30 #define AC_CONTEXT    0x30000000    /* 34c current mmu-context               */
  31 #define AC_SENABLE    0x40000000    /* 34c system dvma/cache/reset enable reg*/
  32 #define AC_UDVMA_ENB  0x50000000    /* 34  Not used on Sun boards, byte      */
  33 #define AC_BUS_ERROR  0x60000000    /* 34  Cleared on read, byte.            */
  34 #define AC_SYNC_ERR   0x60000000    /*   c fault type                        */
  35 #define AC_SYNC_VA    0x60000004    /*   c fault virtual address             */
  36 #define AC_ASYNC_ERR  0x60000008    /*   c asynchronous fault type           */
  37 #define AC_ASYNC_VA   0x6000000c    /*   c async fault virtual address       */
  38 #define AC_LEDS       0x70000000    /* 34  Zero turns on LEDs, byte          */
  39 #define AC_CACHETAGS  0x80000000    /* 34c direct access to the VAC tags     */
  40 #define AC_CACHEDDATA 0x90000000    /* 3 c direct access to the VAC data     */
  41 #define AC_UDVMA_MAP  0xD0000000    /* 4   Not used on Sun boards, byte      */
  42 #define AC_VME_VECTOR 0xE0000000    /* 4   For non-Autovector VME, byte      */
  43 #define AC_BOOT_SCC   0xF0000000    /* 34  bypass to access Zilog 8530. byte.*/
  44
  45 #define SUN3_PAGE_CHG_MASK (SUN3_PAGE_PGNUM_MASK \
  46                             | SUN3_PAGE_ACCESSED | SUN3_PAGE_MODIFIED)
  47
  48 /* Bus access type within PTE. */
  49 #define SUN3_PAGE_TYPE_MASK   (0x0c000000)
  50 #define SUN3_PAGE_TYPE_MEMORY (0x00000000)
  51 #define SUN3_PAGE_TYPE_IO     (0x04000000)
  52 #define SUN3_PAGE_TYPE_VME16  (0x08000000)
  53 #define SUN3_PAGE_TYPE_VME32  (0x0c000000)
  54
  55 /* Mask for page number within PTE. */
  56 #define SUN3_PAGE_PGNUM_MASK (0x0007FFFF)
  57
  58 /* Bits within bus-error register. */
  59 #define SUN3_BUSERR_WATCHDOG    (0x01)
  60 #define SUN3_BUSERR_unused      (0x02)
  61 #define SUN3_BUSERR_FPAENERR    (0x04)
  62 #define SUN3_BUSERR_FPABERR     (0x08)
  63 #define SUN3_BUSERR_VMEBERR     (0x10)
  64 #define SUN3_BUSERR_TIMEOUT     (0x20)
  65 #define SUN3_BUSERR_PROTERR     (0x40)
  66 #define SUN3_BUSERR_INVALID     (0x80)
  67
  68 #ifndef __ASSEMBLY__
  69
  70 /* Read bus error status register (implicitly clearing it). */
  71 static inline unsigned char sun3_get_buserr(void)
  72 {
  73         unsigned char sfc, c;
  74
  75         GET_SFC (sfc);
  76         SET_SFC (FC_CONTROL);
  77         GET_CONTROL_BYTE (AC_BUS_ERROR, c);
  78         SET_SFC (sfc);
  79
  80         return c;
  81 }
  82
  83 /* Read segmap from hardware MMU. */
  84 static inline unsigned long sun3_get_segmap(unsigned long addr)
  85 {
  86         register unsigned long entry;
  87         unsigned char c, sfc;
  88
  89         GET_SFC (sfc);
  90         SET_SFC (FC_CONTROL);
  91         GET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), c);
  92         SET_SFC (sfc);
  93         entry = c;
  94
  95         return entry;
  96 }
  97
  98 /* Write segmap to hardware MMU. */
  99 static inline void sun3_put_segmap(unsigned long addr, unsigned long entry)
 100 {
 101         unsigned char sfc;
 102
 103         GET_DFC (sfc);
 104         SET_DFC (FC_CONTROL);
 105         SET_CONTROL_BYTE (AC_SEGMAP | (addr & SUN3_CONTROL_MASK), entry);
 106         SET_DFC (sfc);
 107
 108         return;
 109 }
 110
 111 /* Read PTE from hardware MMU. */
 112 static inline unsigned long sun3_get_pte(unsigned long addr)
 113 {
 114         register unsigned long entry;
 115         unsigned char sfc;
 116
 117         GET_SFC (sfc);
 118         SET_SFC (FC_CONTROL);
 119         GET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
 120         SET_SFC (sfc);
 121
 122         return entry;
 123 }
 124
 125 /* Write PTE to hardware MMU. */
 126 static inline void sun3_put_pte(unsigned long addr, unsigned long entry)
 127 {
 128         unsigned char sfc;
 129
 130         GET_DFC (sfc);
 131         SET_DFC (FC_CONTROL);
 132         SET_CONTROL_WORD (AC_PAGEMAP | (addr & SUN3_CONTROL_MASK), entry);
 133         SET_DFC (sfc);
 134
 135         return;
 136 }
 137
 138 /* get current context */
 139 static inline unsigned char sun3_get_context(void)
 140 {
 141         unsigned char sfc, c;
 142
 143         GET_SFC(sfc);
 144         SET_SFC(FC_CONTROL);
 145         GET_CONTROL_BYTE(AC_CONTEXT, c);
 146         SET_SFC(sfc);
 147
 148         return c;
 149 }
 150
 151 /* set alternate context */
 152 static inline void sun3_put_context(unsigned char c)
 153 {
 154         unsigned char dfc;
 155         GET_DFC(dfc);
 156         SET_DFC(FC_CONTROL);
 157         SET_CONTROL_BYTE(AC_CONTEXT, c);
 158         SET_DFC(dfc);
 159
 160         return;
 161 }
 162
 163 extern void *sun3_ioremap(unsigned long phys, unsigned long size,
 164                           unsigned long type);
 165
 166 extern int sun3_map_test(unsigned long addr, char *val);
 167
 168 #endif  /* !__ASSEMBLY__ */
 169
 170 #endif  /* !__SUN3_MMU_H__ */