release/src-rt-6.x/linux/linux-2.6/include/asm-sparc/cache.h

   1 /* $Id: cache.h,v 1.9 1999/08/14 03:51:58 anton Exp $
   2  * cache.h:  Cache specific code for the Sparc.  These include flushing
   3  *           and direct tag/data line access.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #ifndef _SPARC_CACHE_H
   9 #define _SPARC_CACHE_H
  10
  11 #include <asm/asi.h>
  12
  13 #define L1_CACHE_SHIFT 5
  14 #define L1_CACHE_BYTES 32
  15 #define L1_CACHE_ALIGN(x) ((((x)+(L1_CACHE_BYTES-1))&~(L1_CACHE_BYTES-1)))
  16
  17 #define SMP_CACHE_BYTES 32
  18
  19 /* Direct access to the instruction cache is provided through and
  20  * alternate address space.  The IDC bit must be off in the ICCR on
  21  * HyperSparcs for these accesses to work.  The code below does not do
  22  * any checking, the caller must do so.  These routines are for
  23  * diagnostics only, but could end up being useful.  Use with care.
  24  * Also, you are asking for trouble if you execute these in one of the
  25  * three instructions following a %asr/%psr access or modification.
  26  */
  27
  28 /* First, cache-tag access. */
  29 static inline unsigned int get_icache_tag(int setnum, int tagnum)
  30 {
  31         unsigned int vaddr, retval;
  32
  33         vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
  34         __asm__ __volatile__("lda [%1] %2, %0\n\t" :
  35                              "=r" (retval) :
  36                              "r" (vaddr), "i" (ASI_M_TXTC_TAG));
  37         return retval;
  38 }
  39
  40 static inline void put_icache_tag(int setnum, int tagnum, unsigned int entry)
  41 {
  42         unsigned int vaddr;
  43
  44         vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
  45         __asm__ __volatile__("sta %0, [%1] %2\n\t" : :
  46                              "r" (entry), "r" (vaddr), "i" (ASI_M_TXTC_TAG) :
  47                              "memory");
  48 }
  49
  50 /* Second cache-data access.  The data is returned two-32bit quantities
  51  * at a time.
  52  */
  53 static inline void get_icache_data(int setnum, int tagnum, int subblock,
  54                                        unsigned int *data)
  55 {
  56         unsigned int value1, value2, vaddr;
  57
  58         vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
  59                 ((subblock&0x3) << 3);
  60         __asm__ __volatile__("ldda [%2] %3, %%g2\n\t"
  61                              "or %%g0, %%g2, %0\n\t"
  62                              "or %%g0, %%g3, %1\n\t" :
  63                              "=r" (value1), "=r" (value2) :
  64                              "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
  65                              "g2", "g3");
  66         data[0] = value1; data[1] = value2;
  67 }
  68
  69 static inline void put_icache_data(int setnum, int tagnum, int subblock,
  70                                        unsigned int *data)
  71 {
  72         unsigned int value1, value2, vaddr;
  73
  74         vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
  75                 ((subblock&0x3) << 3);
  76         value1 = data[0]; value2 = data[1];
  77         __asm__ __volatile__("or %%g0, %0, %%g2\n\t"
  78                              "or %%g0, %1, %%g3\n\t"
  79                              "stda %%g2, [%2] %3\n\t" : :
  80                              "r" (value1), "r" (value2),
  81                              "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
  82                              "g2", "g3", "memory" /* no joke */);
  83 }
  84
  85 /* Different types of flushes with the ICACHE.  Some of the flushes
  86  * affect both the ICACHE and the external cache.  Others only clear
  87  * the ICACHE entries on the cpu itself.  V8's (most) allow
  88  * granularity of flushes on the packet (element in line), whole line,
  89  * and entire cache (ie. all lines) level.  The ICACHE only flushes are
  90  * ROSS HyperSparc specific and are in ross.h
  91  */
  92
  93 /* Flushes which clear out both the on-chip and external caches */
  94 static inline void flush_ei_page(unsigned int addr)
  95 {
  96         __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
  97                              "r" (addr), "i" (ASI_M_FLUSH_PAGE) :
  98                              "memory");
  99 }
 100
 101 static inline void flush_ei_seg(unsigned int addr)
 102 {
 103         __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
 104                              "r" (addr), "i" (ASI_M_FLUSH_SEG) :
 105                              "memory");
 106 }
 107
 108 static inline void flush_ei_region(unsigned int addr)
 109 {
 110         __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
 111                              "r" (addr), "i" (ASI_M_FLUSH_REGION) :
 112                              "memory");
 113 }
 114
 115 static inline void flush_ei_ctx(unsigned int addr)
 116 {
 117         __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
 118                              "r" (addr), "i" (ASI_M_FLUSH_CTX) :
 119                              "memory");
 120 }
 121
 122 static inline void flush_ei_user(unsigned int addr)
 123 {
 124         __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
 125                              "r" (addr), "i" (ASI_M_FLUSH_USER) :
 126                              "memory");
 127 }
 128
 129 #endif /* !(_SPARC_CACHE_H) */