arch/sparc/include/asm/ross.h

   1 /*
   2  * ross.h: Ross module specific definitions and defines.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #ifndef _SPARC_ROSS_H
   8 #define _SPARC_ROSS_H
   9
  10 #include <asm/asi.h>
  11 #include <asm/page.h>
  12
  13 /* Ross made Hypersparcs have a %psr 'impl' field of '0001'.  The 'vers'
  14  * field has '1111'.
  15  */
  16
  17 /* The MMU control register fields on the HyperSparc.
  18  *
  19  * -----------------------------------------------------------------
  20  * |implvers| RSV |CWR|SE|WBE| MID |BM| C|CS|MR|CM|RSV|CE|RSV|NF|ME|
  21  * -----------------------------------------------------------------
  22  *  31    24 23-22 21  20  19 18-15 14 13 12 11 10  9   8 7-2  1  0
  23  *
  24  * Phew, lots of fields there ;-)
  25  *
  26  * CWR: Cache Wrapping Enabled, if one cache wrapping is on.
  27  * SE: Snoop Enable, turns on bus snooping for cache activity if one.
  28  * WBE: Write Buffer Enable, one turns it on.
  29  * MID: The ModuleID of the chip for MBus transactions.
  30  * BM: Boot-Mode. One indicates the MMU is in boot mode.
  31  * C: Indicates whether accesses are cachable while the MMU is
  32  *    disabled.
  33  * CS: Cache Size -- 0 = 128k, 1 = 256k
  34  * MR: Memory Reflection, one indicates that the memory bus connected
  35  *     to the MBus supports memory reflection.
  36  * CM: Cache Mode -- 0 = write-through, 1 = copy-back
  37  * CE: Cache Enable -- 0 = no caching, 1 = cache is on
  38  * NF: No Fault -- 0 = faults trap the CPU from supervisor mode
  39  *                 1 = faults from supervisor mode do not generate traps
  40  * ME: MMU Enable -- 0 = MMU is off, 1 = MMU is on
  41  */
  42
  43 #define HYPERSPARC_CWENABLE   0x00200000
  44 #define HYPERSPARC_SBENABLE   0x00100000
  45 #define HYPERSPARC_WBENABLE   0x00080000
  46 #define HYPERSPARC_MIDMASK    0x00078000
  47 #define HYPERSPARC_BMODE      0x00004000
  48 #define HYPERSPARC_ACENABLE   0x00002000
  49 #define HYPERSPARC_CSIZE      0x00001000
  50 #define HYPERSPARC_MRFLCT     0x00000800
  51 #define HYPERSPARC_CMODE      0x00000400
  52 #define HYPERSPARC_CENABLE    0x00000100
  53 #define HYPERSPARC_NFAULT     0x00000002
  54 #define HYPERSPARC_MENABLE    0x00000001
  55
  56
  57 /* The ICCR instruction cache register on the HyperSparc.
  58  *
  59  * -----------------------------------------------
  60  * |                                 | FTD | ICE |
  61  * -----------------------------------------------
  62  *  31                                  1     0
  63  *
  64  * This register is accessed using the V8 'wrasr' and 'rdasr'
  65  * opcodes, since not all assemblers understand them and those
  66  * that do use different semantics I will just hard code the
  67  * instruction with a '.word' statement.
  68  *
  69  * FTD:  If set to one flush instructions executed during an
  70  *       instruction cache hit occurs, the corresponding line
  71  *       for said cache-hit is invalidated.  If FTD is zero,
  72  *       an unimplemented 'flush' trap will occur when any
  73  *       flush is executed by the processor.
  74  *
  75  * ICE:  If set to one, the instruction cache is enabled.  If
  76  *       zero, the cache will not be used for instruction fetches.
  77  *
  78  * All other bits are read as zeros, and writes to them have no
  79  * effect.
  80  *
  81  * Wheee, not many assemblers understand the %iccr register nor
  82  * the generic asr r/w instructions.
  83  *
  84  *  1000 0011 0100 0111 1100 0000 0000 0000   ! rd %iccr, %g1
  85  *
  86  * 0x  8    3    4    7    c    0    0    0   ! 0x8347c000
  87  *
  88  *  1011 1111 1000 0000 0110 0000 0000 0000   ! wr %g1, 0x0, %iccr
  89  *
  90  * 0x  b    f    8    0    6    0    0    0   ! 0xbf806000
  91  *
  92  */
  93
  94 #define HYPERSPARC_ICCR_FTD     0x00000002
  95 #define HYPERSPARC_ICCR_ICE     0x00000001
  96
  97 #ifndef __ASSEMBLY__
  98
  99 static inline unsigned int get_ross_icr(void)
 100 {
 101         unsigned int icreg;
 102
 103         __asm__ __volatile__(".word 0x8347c000\n\t" /* rd %iccr, %g1 */
 104                              "mov %%g1, %0\n\t"
 105                              : "=r" (icreg)
 106                              : /* no inputs */
 107                              : "g1", "memory");
 108
 109         return icreg;
 110 }
 111
 112 static inline void put_ross_icr(unsigned int icreg)
 113 {
 114         __asm__ __volatile__("or %%g0, %0, %%g1\n\t"
 115                              ".word 0xbf806000\n\t" /* wr %g1, 0x0, %iccr */
 116                              "nop\n\t"
 117                              "nop\n\t"
 118                              "nop\n\t"
 119                              : /* no outputs */
 120                              : "r" (icreg)
 121                              : "g1", "memory");
 122
 123         return;
 124 }
 125
 126 /* HyperSparc specific cache flushing. */
 127
 128 /* This is for the on-chip instruction cache. */
 129 static inline void hyper_flush_whole_icache(void)
 130 {
 131         __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t"
 132                              : /* no outputs */
 133                              : "i" (ASI_M_FLUSH_IWHOLE)
 134                              : "memory");
 135         return;
 136 }
 137
 138 extern int vac_cache_size;
 139 extern int vac_line_size;
 140
 141 static inline void hyper_clear_all_tags(void)
 142 {
 143         unsigned long addr;
 144
 145         for(addr = 0; addr < vac_cache_size; addr += vac_line_size)
 146                 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
 147                                      : /* no outputs */
 148                                      : "r" (addr), "i" (ASI_M_DATAC_TAG)
 149                                      : "memory");
 150 }
 151
 152 static inline void hyper_flush_unconditional_combined(void)
 153 {
 154         unsigned long addr;
 155
 156         for (addr = 0; addr < vac_cache_size; addr += vac_line_size)
 157                 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
 158                                      : /* no outputs */
 159                                      : "r" (addr), "i" (ASI_M_FLUSH_CTX)
 160                                      : "memory");
 161 }
 162
 163 static inline void hyper_flush_cache_user(void)
 164 {
 165         unsigned long addr;
 166
 167         for (addr = 0; addr < vac_cache_size; addr += vac_line_size)
 168                 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
 169                                      : /* no outputs */
 170                                      : "r" (addr), "i" (ASI_M_FLUSH_USER)
 171                                      : "memory");
 172 }
 173
 174 static inline void hyper_flush_cache_page(unsigned long page)
 175 {
 176         unsigned long end;
 177
 178         page &= PAGE_MASK;
 179         end = page + PAGE_SIZE;
 180         while (page < end) {
 181                 __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
 182                                      : /* no outputs */
 183                                      : "r" (page), "i" (ASI_M_FLUSH_PAGE)
 184                                      : "memory");
 185                 page += vac_line_size;
 186         }
 187 }
 188
 189 #endif /* !(__ASSEMBLY__) */
 190
 191 #endif /* !(_SPARC_ROSS_H) */