target/linux/lantiq/patches-2.6.32/250-mt-vpe.patch

   1 --- a/arch/mips/Kconfig
   2 +++ b/arch/mips/Kconfig
   3 @@ -1646,6 +1646,28 @@
   4           Includes a loader for loading an elf relocatable object
   5           onto another VPE and running it.
   6
   7 +config IFX_VPE_EXT
   8 +       bool "IFX APRP Extensions"
   9 +       depends on MIPS_VPE_LOADER
  10 +       default y
  11 +       help
  12 +         IFX included extensions in APRP
  13 +
  14 +config PERFCTRS
  15 +       bool "34K Performance counters"
  16 +       depends on MIPS_MT && PROC_FS
  17 +       default n
  18 +       help
  19 +         34K Performance counter through /proc
  20 +
  21 +config MTSCHED
  22 +       bool "Support mtsched priority configuration for TCs"
  23 +       depends on MIPS_MT && PROC_FS
  24 +       default y
  25 +       help
  26 +         Support for mtsched priority configuration for TCs through
  27 +         /proc/mips/mtsched
  28 +
  29  config MIPS_MT_SMTC_IM_BACKSTOP
  30         bool "Use per-TC register bits as backstop for inhibited IM bits"
  31         depends on MIPS_MT_SMTC
  32 --- a/arch/mips/include/asm/mipsmtregs.h
  33 +++ b/arch/mips/include/asm/mipsmtregs.h
  34 @@ -28,14 +28,34 @@
  35  #define read_c0_vpeconf0()             __read_32bit_c0_register($1, 2)
  36  #define write_c0_vpeconf0(val)         __write_32bit_c0_register($1, 2, val)
  37
  38 +#define read_c0_vpeconf1()              __read_32bit_c0_register($1, 3)
  39 +#define write_c0_vpeconf1(val)          __write_32bit_c0_register($1, 3, val)
  40 +
  41 +#define read_c0_vpeschedule()           __read_32bit_c0_register($1, 5)
  42 +#define write_c0_vpeschedule(val)       __write_32bit_c0_register($1, 5, val)
  43 +
  44 +#define read_c0_vpeschefback()         __read_32bit_c0_register($1, 6)
  45 +#define write_c0_vpeschefback(val)     __write_32bit_c0_register($1, 6, val)
  46 +
  47 +#define read_c0_vpeopt()              __read_32bit_c0_register($1, 7)
  48 +#define write_c0_vpeopt(val)          __write_32bit_c0_register($1, 7, val)
  49 +
  50  #define read_c0_tcstatus()             __read_32bit_c0_register($2, 1)
  51  #define write_c0_tcstatus(val)         __write_32bit_c0_register($2, 1, val)
  52
  53  #define read_c0_tcbind()               __read_32bit_c0_register($2, 2)
  54 +#define write_c0_tcbind(val)           __write_32bit_c0_register($2, 2, val)
  55
  56  #define read_c0_tccontext()            __read_32bit_c0_register($2, 5)
  57  #define write_c0_tccontext(val)                __write_32bit_c0_register($2, 5, val)
  58
  59 +#define read_c0_tcschedule()           __read_32bit_c0_register($2, 6)
  60 +#define write_c0_tcschedule(val)       __write_32bit_c0_register($2, 6, val)
  61 +
  62 +#define read_c0_tcschefback()          __read_32bit_c0_register($2, 7)
  63 +#define write_c0_tcschefback(val)      __write_32bit_c0_register($2, 7, val)
  64 +
  65 +
  66  #else /* Assembly */
  67  /*
  68   * Macros for use in assembly language code
  69 @@ -74,6 +94,8 @@
  70  #define MVPCONTROL_STLB_SHIFT  2
  71  #define MVPCONTROL_STLB                (_ULCAST_(1) << MVPCONTROL_STLB_SHIFT)
  72
  73 +#define MVPCONTROL_CPA_SHIFT   3
  74 +#define MVPCONTROL_CPA         (_ULCAST_(1) << MVPCONTROL_CPA_SHIFT)
  75
  76  /* MVPConf0 fields */
  77  #define MVPCONF0_PTC_SHIFT     0
  78 @@ -84,6 +106,8 @@
  79  #define MVPCONF0_TCA           ( _ULCAST_(1) << MVPCONF0_TCA_SHIFT)
  80  #define MVPCONF0_PTLBE_SHIFT   16
  81  #define MVPCONF0_PTLBE         (_ULCAST_(0x3ff) << MVPCONF0_PTLBE_SHIFT)
  82 +#define MVPCONF0_PCP_SHIFT     27
  83 +#define MVPCONF0_PCP           (_ULCAST_(1) << MVPCONF0_PCP_SHIFT)
  84  #define MVPCONF0_TLBS_SHIFT    29
  85  #define MVPCONF0_TLBS          (_ULCAST_(1) << MVPCONF0_TLBS_SHIFT)
  86  #define MVPCONF0_M_SHIFT       31
  87 @@ -121,9 +145,25 @@
  88  #define VPECONF0_VPA           (_ULCAST_(1) << VPECONF0_VPA_SHIFT)
  89  #define VPECONF0_MVP_SHIFT     1
  90  #define VPECONF0_MVP           (_ULCAST_(1) << VPECONF0_MVP_SHIFT)
  91 +#define VPECONF0_ICS_SHIFT      16
  92 +#define VPECONF0_ICS           (_ULCAST_(1) << VPECONF0_ICS_SHIFT)
  93 +#define VPECONF0_DCS_SHIFT      17
  94 +#define VPECONF0_DCS            (_ULCAST_(1) << VPECONF0_DCS_SHIFT)
  95  #define VPECONF0_XTC_SHIFT     21
  96  #define VPECONF0_XTC           (_ULCAST_(0xff) << VPECONF0_XTC_SHIFT)
  97
  98 +/* VPEOpt fields */
  99 +#define VPEOPT_DWX_SHIFT       0
 100 +#define VPEOPT_IWX_SHIFT       8
 101 +#define VPEOPT_IWX0            ( _ULCAST_(0x1) << VPEOPT_IWX_SHIFT)
 102 +#define VPEOPT_IWX1            ( _ULCAST_(0x2) << VPEOPT_IWX_SHIFT)
 103 +#define VPEOPT_IWX2            ( _ULCAST_(0x4) << VPEOPT_IWX_SHIFT)
 104 +#define VPEOPT_IWX3            ( _ULCAST_(0x8) << VPEOPT_IWX_SHIFT)
 105 +#define VPEOPT_DWX0            ( _ULCAST_(0x1) << VPEOPT_DWX_SHIFT)
 106 +#define VPEOPT_DWX1            ( _ULCAST_(0x2) << VPEOPT_DWX_SHIFT)
 107 +#define VPEOPT_DWX2            ( _ULCAST_(0x4) << VPEOPT_DWX_SHIFT)
 108 +#define VPEOPT_DWX3            ( _ULCAST_(0x8) << VPEOPT_DWX_SHIFT)
 109 +
 110  /* TCStatus fields (per TC) */
 111  #define TCSTATUS_TASID         (_ULCAST_(0xff))
 112  #define TCSTATUS_IXMT_SHIFT    10
 113 @@ -350,6 +390,14 @@
 114  #define write_vpe_c0_vpecontrol(val)   mttc0(1, 1, val)
 115  #define read_vpe_c0_vpeconf0()         mftc0(1, 2)
 116  #define write_vpe_c0_vpeconf0(val)     mttc0(1, 2, val)
 117 +#define read_vpe_c0_vpeschedule()      mftc0(1, 5)
 118 +#define write_vpe_c0_vpeschedule(val)  mttc0(1, 5, val)
 119 +#define read_vpe_c0_vpeschefback()     mftc0(1, 6)
 120 +#define write_vpe_c0_vpeschefback(val) mttc0(1, 6, val)
 121 +#define read_vpe_c0_vpeopt()            mftc0(1, 7)
 122 +#define write_vpe_c0_vpeopt(val)        mttc0(1, 7, val)
 123 +#define read_vpe_c0_wired()            mftc0(6, 0)
 124 +#define write_vpe_c0_wired(val)                mttc0(6, 0, val)
 125  #define read_vpe_c0_count()            mftc0(9, 0)
 126  #define write_vpe_c0_count(val)                mttc0(9, 0, val)
 127  #define read_vpe_c0_status()           mftc0(12, 0)
 128 @@ -381,6 +429,12 @@
 129  #define write_tc_c0_tchalt(val)                mttc0(2, 4, val)
 130  #define read_tc_c0_tccontext()         mftc0(2, 5)
 131  #define write_tc_c0_tccontext(val)     mttc0(2, 5, val)
 132 +#define read_tc_c0_tcschedule()                mftc0(2, 6)
 133 +#define write_tc_c0_tcschedule(val)    mttc0(2, 6, val)
 134 +#define read_tc_c0_tcschefback()       mftc0(2, 7)
 135 +#define write_tc_c0_tcschefback(val)   mttc0(2, 7, val)
 136 +#define read_tc_c0_entryhi()            mftc0(10, 0)
 137 +#define write_tc_c0_entryhi(val)        mttc0(10, 0, val)
 138
 139  /* GPR */
 140  #define read_tc_gpr_sp()               mftgpr(29)
 141 --- a/arch/mips/kernel/Makefile
 142 +++ b/arch/mips/kernel/Makefile
 143 @@ -78,7 +78,8 @@
 144
 145  obj-$(CONFIG_KGDB)             += kgdb.o
 146  obj-$(CONFIG_PROC_FS)          += proc.o
 147 -
 148 +obj-$(CONFIG_MTSCHED)          += mtsched_proc.o
 149 +obj-$(CONFIG_PERFCTRS)         += perf_proc.o
 150  obj-$(CONFIG_64BIT)            += cpu-bugs64.o
 151
 152  obj-$(CONFIG_I8253)            += i8253.o
 153 --- a/arch/mips/kernel/mips-mt.c
 154 +++ b/arch/mips/kernel/mips-mt.c
 155 @@ -21,26 +21,96 @@
 156  #include <asm/cacheflush.h>
 157
 158  int vpelimit;
 159 -
 160  static int __init maxvpes(char *str)
 161  {
 162         get_option(&str, &vpelimit);
 163 -
 164         return 1;
 165  }
 166 -
 167  __setup("maxvpes=", maxvpes);
 168
 169  int tclimit;
 170 -
 171  static int __init maxtcs(char *str)
 172  {
 173         get_option(&str, &tclimit);
 174 +       return 1;
 175 +}
 176 +__setup("maxtcs=", maxtcs);
 177
 178 +#ifdef CONFIG_IFX_VPE_EXT
 179 +int stlb;
 180 +static int __init istlbshared(char *str)
 181 +{
 182 +       get_option(&str, &stlb);
 183         return 1;
 184  }
 185 +__setup("vpe_tlb_shared=", istlbshared);
 186
 187 -__setup("maxtcs=", maxtcs);
 188 +int vpe0_wired;
 189 +static int __init vpe0wired(char *str)
 190 +{
 191 +       get_option(&str, &vpe0_wired);
 192 +       return 1;
 193 +}
 194 +__setup("vpe0_wired_tlb_entries=", vpe0wired);
 195 +
 196 +int vpe1_wired;
 197 +static int __init vpe1wired(char *str)
 198 +{
 199 +       get_option(&str, &vpe1_wired);
 200 +       return 1;
 201 +}
 202 +__setup("vpe1_wired_tlb_entries=", vpe1wired);
 203 +
 204 +#ifdef CONFIG_MIPS_MT_SMTC
 205 +extern int nostlb;
 206 +#endif
 207 +void configure_tlb(void)
 208 +{
 209 +       int vpeflags, tcflags, tlbsiz;
 210 +       unsigned int config1val;
 211 +       vpeflags = dvpe();
 212 +       tcflags = dmt();
 213 +       write_c0_vpeconf0((read_c0_vpeconf0() | VPECONF0_MVP));
 214 +       write_c0_mvpcontrol((read_c0_mvpcontrol() | MVPCONTROL_VPC));
 215 +       mips_ihb();
 216 +       //printk("stlb = %d, vpe0_wired = %d vpe1_wired=%d\n", stlb,vpe0_wired, vpe1_wired);
 217 +       if (stlb) {
 218 +               if (!(read_c0_mvpconf0() & MVPCONF0_TLBS)) {
 219 +                       emt(tcflags);
 220 +                       evpe(vpeflags);
 221 +                       return;
 222 +               }
 223 +
 224 +               write_c0_mvpcontrol(read_c0_mvpcontrol() | MVPCONTROL_STLB);
 225 +               write_c0_wired(vpe0_wired + vpe1_wired);
 226 +               if (((read_vpe_c0_config() & MIPS_CONF_MT) >> 7) == 1) {
 227 +                       config1val = read_vpe_c0_config1();
 228 +                       tlbsiz = (((config1val >> 25) & 0x3f) + 1);
 229 +                       if (tlbsiz > 64)
 230 +                               tlbsiz = 64;
 231 +                       cpu_data[0].tlbsize = tlbsiz;
 232 +                       current_cpu_data.tlbsize = tlbsiz;
 233 +               }
 234 +
 235 +       }
 236 +       else {
 237 +               write_c0_mvpcontrol(read_c0_mvpcontrol() & ~MVPCONTROL_STLB);
 238 +               write_c0_wired(vpe0_wired);
 239 +       }
 240 +
 241 +       ehb();
 242 +       write_c0_mvpcontrol((read_c0_mvpcontrol() & ~MVPCONTROL_VPC));
 243 +       ehb();
 244 +       local_flush_tlb_all();
 245 +
 246 +       printk("Wired TLB entries for Linux read_c0_wired() = %d\n", read_c0_wired());
 247 +#ifdef CONFIG_MIPS_MT_SMTC
 248 +       nostlb = !stlb;
 249 +#endif
 250 +       emt(tcflags);
 251 +       evpe(vpeflags);
 252 +}
 253 +#endif
 254
 255  /*
 256   * Dump new MIPS MT state for the core. Does not leave TCs halted.
 257 @@ -78,18 +148,18 @@
 258                         if ((read_tc_c0_tcbind() & TCBIND_CURVPE) == i) {
 259                                 printk("  VPE %d\n", i);
 260                                 printk("   VPEControl : %08lx\n",
 261 -                                      read_vpe_c0_vpecontrol());
 262 +                                       read_vpe_c0_vpecontrol());
 263                                 printk("   VPEConf0 : %08lx\n",
 264 -                                      read_vpe_c0_vpeconf0());
 265 +                                       read_vpe_c0_vpeconf0());
 266                                 printk("   VPE%d.Status : %08lx\n",
 267 -                                      i, read_vpe_c0_status());
 268 +                                       i, read_vpe_c0_status());
 269                                 printk("   VPE%d.EPC : %08lx %pS\n",
 270 -                                      i, read_vpe_c0_epc(),
 271 -                                      (void *) read_vpe_c0_epc());
 272 +                                       i, read_vpe_c0_epc(),
 273 +                                       (void *) read_vpe_c0_epc());
 274                                 printk("   VPE%d.Cause : %08lx\n",
 275 -                                      i, read_vpe_c0_cause());
 276 +                                       i, read_vpe_c0_cause());
 277                                 printk("   VPE%d.Config7 : %08lx\n",
 278 -                                      i, read_vpe_c0_config7());
 279 +                                       i, read_vpe_c0_config7());
 280                                 break; /* Next VPE */
 281                         }
 282                 }
 283 @@ -287,6 +357,9 @@
 284                 printk("Mapped %ld ITC cells starting at 0x%08x\n",
 285                         ((itcblkgrn & 0x7fe00000) >> 20), itc_base);
 286         }
 287 +#ifdef CONFIG_IFX_VPE_EXT
 288 +       configure_tlb();
 289 +#endif
 290  }
 291
 292  /*
 293 --- a/arch/mips/kernel/proc.c
 294 +++ b/arch/mips/kernel/proc.c
 295 @@ -7,6 +7,7 @@
 296  #include <linux/kernel.h>
 297  #include <linux/sched.h>
 298  #include <linux/seq_file.h>
 299 +#include <linux/proc_fs.h>
 300  #include <asm/bootinfo.h>
 301  #include <asm/cpu.h>
 302  #include <asm/cpu-features.h>
 303 @@ -108,3 +109,19 @@
 304         .stop   = c_stop,
 305         .show   = show_cpuinfo,
 306  };
 307 +
 308 +/*
 309 + * Support for MIPS/local /proc hooks in /proc/mips/
 310 + */
 311 +
 312 +static struct proc_dir_entry *mips_proc = NULL;
 313 +
 314 +struct proc_dir_entry *get_mips_proc_dir(void)
 315 +{
 316 +       /*
 317 +        * This ought not to be preemptable.
 318 +        */
 319 +       if(mips_proc == NULL)
 320 +               mips_proc = proc_mkdir("mips", NULL);
 321 +       return(mips_proc);
 322 +}
 323 --- a/arch/mips/kernel/smtc.c
 324 +++ b/arch/mips/kernel/smtc.c
 325 @@ -1328,6 +1328,13 @@
 326         asid = asid_cache(cpu);
 327
 328         do {
 329 +#ifdef CONFIG_IFX_VPE_EXT
 330 +               /* If TLB is shared between AP and RP (AP is running SMTC),
 331 +                  leave out max ASID i.e., ASID_MASK for RP
 332 +                */
 333 +               if (!nostlb && ((asid & ASID_MASK) == (ASID_MASK - 1)))
 334 +                       asid++;
 335 +#endif
 336                 if (!((asid += ASID_INC) & ASID_MASK) ) {
 337                         if (cpu_has_vtag_icache)
 338                                 flush_icache_all();
 339 --- a/arch/mips/kernel/vpe.c
 340 +++ b/arch/mips/kernel/vpe.c
 341 @@ -77,6 +77,58 @@
 342  static int kspd_events_reqd;
 343  #endif
 344
 345 +#ifdef CONFIG_IFX_VPE_EXT
 346 +static int is_sdepgm;
 347 +extern int stlb;
 348 +extern int vpe0_wired;
 349 +extern int vpe1_wired;
 350 +unsigned int vpe1_load_addr;
 351 +
 352 +static int __init load_address(char *str)
 353 +{
 354 +       get_option(&str, &vpe1_load_addr);
 355 +       return 1;
 356 +}
 357 +__setup("vpe1_load_addr=", load_address);
 358 +
 359 +#include <asm/mipsmtregs.h>
 360 +#define write_vpe_c0_wired(val)                mttc0(6, 0, val)
 361 +
 362 +#ifndef COMMAND_LINE_SIZE
 363 +#      define COMMAND_LINE_SIZE        512
 364 +#endif
 365 +
 366 +char command_line[COMMAND_LINE_SIZE * 2];
 367 +
 368 +static unsigned int vpe1_mem;
 369 +static int __init vpe1mem(char *str)
 370 +{
 371 +       vpe1_mem = memparse(str, &str);
 372 +       return 1;
 373 +}
 374 +__setup("vpe1_mem=", vpe1mem);
 375 +
 376 +uint32_t vpe1_wdog_ctr;
 377 +static int __init wdog_ctr(char *str)
 378 +{
 379 +       get_option(&str, &vpe1_wdog_ctr);
 380 +       return 1;
 381 +}
 382 +
 383 +__setup("vpe1_wdog_ctr_addr=", wdog_ctr);
 384 +EXPORT_SYMBOL(vpe1_wdog_ctr);
 385 +
 386 +uint32_t vpe1_wdog_timeout;
 387 +static int __init wdog_timeout(char *str)
 388 +{
 389 +        get_option(&str, &vpe1_wdog_timeout);
 390 +        return 1;
 391 +}
 392 +
 393 +__setup("vpe1_wdog_timeout=", wdog_timeout);
 394 +EXPORT_SYMBOL(vpe1_wdog_timeout);
 395 +
 396 +#endif
 397  /* grab the likely amount of memory we will need. */
 398  #ifdef CONFIG_MIPS_VPE_LOADER_TOM
 399  #define P_SIZE (2 * 1024 * 1024)
 400 @@ -269,6 +321,13 @@
 401         void *addr;
 402
 403  #ifdef CONFIG_MIPS_VPE_LOADER_TOM
 404 +#ifdef CONFIG_IFX_VPE_EXT
 405 +       if (vpe1_load_addr) {
 406 +               memset((void *)vpe1_load_addr, 0, len);
 407 +               return (void *)vpe1_load_addr;
 408 +       }
 409 +#endif
 410 +
 411         /*
 412          * This means you must tell Linux to use less memory than you
 413          * physically have, for example by passing a mem= boot argument.
 414 @@ -747,6 +806,12 @@
 415         }
 416
 417         /* Write the address we want it to start running from in the TCPC register. */
 418 +#if defined(CONFIG_IFX_VPE_EXT) && 0
 419 +       if (stlb)
 420 +               write_vpe_c0_wired(vpe0_wired + vpe1_wired);
 421 +       else
 422 +               write_vpe_c0_wired(vpe1_wired);
 423 +#endif
 424         write_tc_c0_tcrestart((unsigned long)v->__start);
 425         write_tc_c0_tccontext((unsigned long)0);
 426
 427 @@ -760,6 +825,20 @@
 428
 429         write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
 430
 431 +#if defined(CONFIG_IFX_VPE_EXT) && 0
 432 +       /*
 433 +        * $a2 & $a3 are used to pass command line parameters to VPE1. $a2
 434 +        * points to the start of the command line string and $a3 points to
 435 +        * the end of the string. This convention is identical to the Linux
 436 +        * kernel boot parameter passing mechanism. Please note that $a3 is
 437 +        * used to pass physical memory size or 0 in SDE tool kit. So, if you
 438 +        * are passing comand line parameters through $a2 & $a3 SDE programs
 439 +        * don't work as desired.
 440 +        */
 441 +       mttgpr(6, command_line);
 442 +       mttgpr(7, (command_line + strlen(command_line)));
 443 +       if (is_sdepgm)
 444 +#endif
 445         /*
 446          * The sde-kit passes 'memsize' to __start in $a3, so set something
 447          * here...  Or set $a3 to zero and define DFLT_STACK_SIZE and
 448 @@ -834,6 +913,9 @@
 449         if ( (v->__start == 0) || (v->shared_ptr == NULL))
 450                 return -1;
 451
 452 +#ifdef CONFIG_IFX_VPE_EXT
 453 +       is_sdepgm = 1;
 454 +#endif
 455         return 0;
 456  }
 457
 458 @@ -995,6 +1077,15 @@
 459                            (unsigned long)v->load_addr + v->len);
 460
 461         if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) {
 462 +#ifdef CONFIG_IFX_VPE_EXT
 463 +               if (vpe1_load_addr) {
 464 +                       /* Conversion to KSEG1 is required ??? */
 465 +                       v->__start = KSEG1ADDR(vpe1_load_addr);
 466 +                       is_sdepgm = 0;
 467 +                       return 0;
 468 +               }
 469 +#endif
 470 +
 471                 if (v->__start == 0) {
 472                         printk(KERN_WARNING "VPE loader: program does not contain "
 473                                "a __start symbol\n");
 474 @@ -1065,6 +1156,9 @@
 475         struct vpe_notifications *not;
 476         struct vpe *v;
 477         int ret;
 478 +#ifdef CONFIG_IFX_VPE_EXT
 479 +   int progsize;
 480 +#endif
 481
 482         if (minor != iminor(inode)) {
 483                 /* assume only 1 device at the moment. */
 484 @@ -1091,14 +1185,22 @@
 485                 cleanup_tc(get_tc(tclimit));
 486         }
 487
 488 +#ifdef CONFIG_IFX_VPE_EXT
 489 +       progsize = (vpe1_mem  != 0) ? vpe1_mem : P_SIZE;
 490 +       //printk("progsize = %x\n", progsize);
 491 +       v->pbuffer = vmalloc(progsize);
 492 +       v->plen = progsize;
 493 +#else
 494         /* this of-course trashes what was there before... */
 495         v->pbuffer = vmalloc(P_SIZE);
 496         v->plen = P_SIZE;
 497 +#endif
 498         v->load_addr = NULL;
 499         v->len = 0;
 500 -
 501 +#if 0
 502         v->uid = filp->f_cred->fsuid;
 503         v->gid = filp->f_cred->fsgid;
 504 +#endif
 505
 506  #ifdef CONFIG_MIPS_APSP_KSPD
 507         /* get kspd to tell us when a syscall_exit happens */
 508 @@ -1351,6 +1453,133 @@
 509         cleanup_tc(get_tc(sp_id));
 510  }
 511  #endif
 512 +#ifdef CONFIG_IFX_VPE_EXT
 513 +int32_t vpe1_sw_start(void* sw_start_addr, uint32_t tcmask, uint32_t flags)
 514 +{
 515 +       enum vpe_state state;
 516 +       struct vpe *v = get_vpe(tclimit);
 517 +       struct vpe_notifications *not;
 518 +
 519 +       if (tcmask || flags) {
 520 +               printk(KERN_WARNING "Currently tcmask and flags should be 0.\
 521 +                               other values not supported\n");
 522 +               return -1;
 523 +       }
 524 +
 525 +       state = xchg(&v->state, VPE_STATE_INUSE);
 526 +       if (state != VPE_STATE_UNUSED) {
 527 +               vpe_stop(v);
 528 +
 529 +               list_for_each_entry(not, &v->notify, list) {
 530 +                       not->stop(tclimit);
 531 +               }
 532 +       }
 533 +
 534 +       v->__start = (unsigned long)sw_start_addr;
 535 +       is_sdepgm = 0;
 536 +
 537 +       if (!vpe_run(v)) {
 538 +               printk(KERN_DEBUG "VPE loader: VPE1 running successfully\n");
 539 +               return 0;
 540 +       }
 541 +       return -1;
 542 +}
 543 +
 544 +EXPORT_SYMBOL(vpe1_sw_start);
 545 +
 546 +int32_t vpe1_sw_stop(uint32_t flags)
 547 +{
 548 +       struct vpe *v = get_vpe(tclimit);
 549 +
 550 +       if (!vpe_free(v)) {
 551 +               printk(KERN_DEBUG "RP Stopped\n");
 552 +               return 0;
 553 +       }
 554 +       else
 555 +               return -1;
 556 +}
 557 +
 558 +EXPORT_SYMBOL(vpe1_sw_stop);
 559 +
 560 +uint32_t vpe1_get_load_addr (uint32_t flags)
 561 +{
 562 +       return vpe1_load_addr;
 563 +}
 564 +
 565 +EXPORT_SYMBOL(vpe1_get_load_addr);
 566 +
 567 +uint32_t vpe1_get_max_mem (uint32_t flags)
 568 +{
 569 +       if (!vpe1_mem)
 570 +               return P_SIZE;
 571 +       else
 572 +               return vpe1_mem;
 573 +}
 574 +
 575 +EXPORT_SYMBOL(vpe1_get_max_mem);
 576 +
 577 +void* vpe1_get_cmdline_argument(void)
 578 +{
 579 +       return saved_command_line;
 580 +}
 581 +
 582 +EXPORT_SYMBOL(vpe1_get_cmdline_argument);
 583 +
 584 +int32_t vpe1_set_boot_param(char *field, char *value, char flags)
 585 +{
 586 +       char *ptr, string[64];
 587 +       int start_off, end_off;
 588 +       if (!field)
 589 +               return -1;
 590 +       strcpy(string, field);
 591 +       if (value) {
 592 +               strcat(string, "=");
 593 +               strcat(string, value);
 594 +               strcat(command_line, " ");
 595 +               strcat(command_line, string);
 596 +       }
 597 +       else {
 598 +               ptr = strstr(command_line, string);
 599 +               if (ptr) {
 600 +                       start_off = ptr - command_line;
 601 +                       ptr += strlen(string);
 602 +                       while ((*ptr != ' ') && (*ptr != '\0'))
 603 +                               ptr++;
 604 +                       end_off = ptr - command_line;
 605 +                       command_line[start_off] = '\0';
 606 +                       strcat (command_line, command_line+end_off);
 607 +               }
 608 +       }
 609 +       return 0;
 610 +}
 611 +
 612 +EXPORT_SYMBOL(vpe1_set_boot_param);
 613 +
 614 +int32_t vpe1_get_boot_param(char *field, char **value, char flags)
 615 +{
 616 +       char *ptr, string[64];
 617 +       int i = 0;
 618 +       if (!field)
 619 +               return -1;
 620 +       if ((ptr = strstr(command_line, field))) {
 621 +               ptr += strlen(field) + 1; /* including = */
 622 +               while ((*ptr != ' ') && (*ptr != '\0'))
 623 +                       string[i++] = *ptr++;
 624 +               string[i] = '\0';
 625 +               *value = kmalloc((strlen(string) + 1), GFP_KERNEL);
 626 +               if (*value != NULL)
 627 +                       strcpy(*value, string);
 628 +       }
 629 +       else
 630 +               *value = NULL;
 631 +
 632 +       return 0;
 633 +}
 634 +
 635 +EXPORT_SYMBOL(vpe1_get_boot_param);
 636 +
 637 +extern void configure_tlb(void);
 638 +#endif
 639
 640  static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
 641                           const char *buf, size_t len)
 642 @@ -1432,6 +1661,18 @@
 643                 printk("VPE loader: not a MIPS MT capable processor\n");
 644                 return -ENODEV;
 645         }
 646 +#ifdef CONFIG_IFX_VPE_EXT
 647 +#ifndef CONFIG_MIPS_MT_SMTC
 648 +       configure_tlb();
 649 +#endif
 650 +#endif
 651 +
 652 +#ifndef CONFIG_MIPS_MT_SMTC
 653 +       if (!vpelimit)
 654 +               vpelimit = 1;
 655 +       if (!tclimit)
 656 +               tclimit = 1;
 657 +#endif
 658
 659         if (vpelimit == 0) {
 660                 printk(KERN_WARNING "No VPEs reserved for AP/SP, not "
 661 @@ -1476,10 +1717,12 @@
 662         mtflags = dmt();
 663         vpflags = dvpe();
 664
 665 +       back_to_back_c0_hazard();
 666 +
 667         /* Put MVPE's into 'configuration state' */
 668         set_c0_mvpcontrol(MVPCONTROL_VPC);
 669
 670 -       /* dump_mtregs(); */
 671 +       dump_mtregs();
 672
 673         val = read_c0_mvpconf0();
 674         hw_tcs = (val & MVPCONF0_PTC) + 1;
 675 @@ -1491,6 +1734,7 @@
 676                  * reschedule send IPIs or similar we might hang.
 677                  */
 678                 clear_c0_mvpcontrol(MVPCONTROL_VPC);
 679 +               back_to_back_c0_hazard();
 680                 evpe(vpflags);
 681                 emt(mtflags);
 682                 local_irq_restore(flags);
 683 @@ -1516,6 +1760,7 @@
 684                         }
 685
 686                         v->ntcs = hw_tcs - tclimit;
 687 +                        write_tc_c0_tcbind((read_tc_c0_tcbind() & ~TCBIND_CURVPE) | 1);
 688
 689                         /* add the tc to the list of this vpe's tc's. */
 690                         list_add(&t->tc, &v->tc);
 691 @@ -1584,6 +1829,7 @@
 692  out_reenable:
 693         /* release config state */
 694         clear_c0_mvpcontrol(MVPCONTROL_VPC);
 695 +       back_to_back_c0_hazard();
 696
 697         evpe(vpflags);
 698         emt(mtflags);
 699 --- /dev/null
 700 +++ b/arch/mips/kernel/mtsched_proc.c
 701 @@ -0,0 +1,279 @@
 702 +/*
 703 + * /proc hooks for MIPS MT scheduling policy management for 34K cores
 704 + *
 705 + *  This program is free software; you can distribute it and/or modify it
 706 + *  under the terms of the GNU General Public License (Version 2) as
 707 + *  published by the Free Software Foundation.
 708 + *
 709 + *  This program is distributed in the hope it will be useful, but WITHOUT
 710 + *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 711 + *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 712 + *  for more details.
 713 + *
 714 + *  You should have received a copy of the GNU General Public License along
 715 + *  with this program; if not, write to the Free Software Foundation, Inc.,
 716 + *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 717 + *
 718 + * Copyright (C) 2006 Mips Technologies, Inc
 719 + */
 720 +
 721 +#include <linux/kernel.h>
 722 +
 723 +#include <asm/cpu.h>
 724 +#include <asm/processor.h>
 725 +#include <asm/system.h>
 726 +#include <asm/mipsregs.h>
 727 +#include <asm/mipsmtregs.h>
 728 +#include <asm/uaccess.h>
 729 +#include <linux/proc_fs.h>
 730 +
 731 +static struct proc_dir_entry *mtsched_proc;
 732 +
 733 +#ifndef CONFIG_MIPS_MT_SMTC
 734 +#define NTCS 2
 735 +#else
 736 +#define NTCS NR_CPUS
 737 +#endif
 738 +#define NVPES 2
 739 +
 740 +int lastvpe = 1;
 741 +int lasttc = 8;
 742 +
 743 +static int proc_read_mtsched(char *page, char **start, off_t off,
 744 +                       int count, int *eof, void *data)
 745 +{
 746 +       int totalen = 0;
 747 +       int len;
 748 +
 749 +       int i;
 750 +       int vpe;
 751 +       int mytc;
 752 +       unsigned long flags;
 753 +       unsigned int mtflags;
 754 +       unsigned int haltstate;
 755 +       unsigned int vpes_checked[NVPES];
 756 +       unsigned int vpeschedule[NVPES];
 757 +       unsigned int vpeschefback[NVPES];
 758 +       unsigned int tcschedule[NTCS];
 759 +       unsigned int tcschefback[NTCS];
 760 +
 761 +       /* Dump the state of the MIPS MT scheduling policy manager */
 762 +       /* Inititalize control state */
 763 +       for(i = 0; i < NVPES; i++) {
 764 +               vpes_checked[i] = 0;
 765 +               vpeschedule[i] = 0;
 766 +               vpeschefback[i] = 0;
 767 +       }
 768 +       for(i = 0; i < NTCS; i++) {
 769 +               tcschedule[i] = 0;
 770 +               tcschefback[i] = 0;
 771 +       }
 772 +
 773 +       /* Disable interrupts and multithreaded issue */
 774 +       local_irq_save(flags);
 775 +       mtflags = dvpe();
 776 +
 777 +       /* Then go through the TCs, halt 'em, and extract the values */
 778 +       mytc = (read_c0_tcbind() & TCBIND_CURTC) >> TCBIND_CURTC_SHIFT;
 779 +       for(i = 0; i < NTCS; i++) {
 780 +               if(i == mytc) {
 781 +                       /* No need to halt ourselves! */
 782 +                       tcschedule[i] = read_c0_tcschedule();
 783 +                       tcschefback[i] = read_c0_tcschefback();
 784 +                       /* If VPE bound to TC hasn't been checked, do it */
 785 +                       vpe = read_c0_tcbind() & TCBIND_CURVPE;
 786 +                       if(!vpes_checked[vpe]) {
 787 +                               vpeschedule[vpe] = read_c0_vpeschedule();
 788 +                               vpeschefback[vpe] = read_c0_vpeschefback();
 789 +                               vpes_checked[vpe] = 1;
 790 +                       }
 791 +               } else {
 792 +                       settc(i);
 793 +                       haltstate = read_tc_c0_tchalt();
 794 +                       write_tc_c0_tchalt(TCHALT_H);
 795 +                       mips_ihb();
 796 +                       tcschedule[i] = read_tc_c0_tcschedule();
 797 +                       tcschefback[i] = read_tc_c0_tcschefback();
 798 +                       /* If VPE bound to TC hasn't been checked, do it */
 799 +                       vpe = read_tc_c0_tcbind() & TCBIND_CURVPE;
 800 +                       if(!vpes_checked[vpe]) {
 801 +                           vpeschedule[vpe] = read_vpe_c0_vpeschedule();
 802 +                           vpeschefback[vpe] = read_vpe_c0_vpeschefback();
 803 +                           vpes_checked[vpe] = 1;
 804 +                       }
 805 +                       if(!haltstate) write_tc_c0_tchalt(0);
 806 +               }
 807 +       }
 808 +       /* Re-enable MT and interrupts */
 809 +       evpe(mtflags);
 810 +       local_irq_restore(flags);
 811 +
 812 +       for(vpe=0; vpe < NVPES; vpe++) {
 813 +               len = sprintf(page, "VPE[%d].VPEschedule  = 0x%08x\n",
 814 +                       vpe, vpeschedule[vpe]);
 815 +               totalen += len;
 816 +               page += len;
 817 +               len = sprintf(page, "VPE[%d].VPEschefback = 0x%08x\n",
 818 +                       vpe, vpeschefback[vpe]);
 819 +               totalen += len;
 820 +               page += len;
 821 +       }
 822 +       for(i=0; i < NTCS; i++) {
 823 +               len = sprintf(page, "TC[%d].TCschedule    = 0x%08x\n",
 824 +                       i, tcschedule[i]);
 825 +               totalen += len;
 826 +               page += len;
 827 +               len = sprintf(page, "TC[%d].TCschefback   = 0x%08x\n",
 828 +                       i, tcschefback[i]);
 829 +               totalen += len;
 830 +               page += len;
 831 +       }
 832 +       return totalen;
 833 +}
 834 +
 835 +/*
 836 + * Write to perf counter registers based on text input
 837 + */
 838 +
 839 +#define TXTBUFSZ 100
 840 +
 841 +static int proc_write_mtsched(struct file *file, const char *buffer,
 842 +                               unsigned long count, void *data)
 843 +{
 844 +       int len = 0;
 845 +       char mybuf[TXTBUFSZ];
 846 +       /* At most, we will set up 9 TCs and 2 VPEs, 11 entries in all */
 847 +       char entity[1];   //, entity1[1];
 848 +       int number[1];
 849 +       unsigned long value[1];
 850 +       int nparsed = 0 , index = 0;
 851 +       unsigned long flags;
 852 +       unsigned int mtflags;
 853 +       unsigned int haltstate;
 854 +       unsigned int tcbindval;
 855 +
 856 +       if(count >= TXTBUFSZ) len = TXTBUFSZ-1;
 857 +       else len = count;
 858 +       memset(mybuf,0,TXTBUFSZ);
 859 +       if(copy_from_user(mybuf, buffer, len)) return -EFAULT;
 860 +
 861 +       nparsed = sscanf(mybuf, "%c%d %lx",
 862 +                &entity[0] ,&number[0], &value[0]);
 863 +
 864 +       /*
 865 +        * Having acquired the inputs, which might have
 866 +        * generated exceptions and preemptions,
 867 +        * program the registers.
 868 +        */
 869 +       /* Disable interrupts and multithreaded issue */
 870 +       local_irq_save(flags);
 871 +       mtflags = dvpe();
 872 +
 873 +       if(entity[index] == 't' ) {
 874 +               /* Set TCSchedule or TCScheFBack of specified TC */
 875 +               if(number[index] > NTCS) goto skip;
 876 +               /* If it's our own TC, do it direct */
 877 +               if(number[index] ==
 878 +                               ((read_c0_tcbind() & TCBIND_CURTC)
 879 +                               >> TCBIND_CURTC_SHIFT)) {
 880 +                       if(entity[index] == 't')
 881 +                                write_c0_tcschedule(value[index]);
 882 +                       else
 883 +                               write_c0_tcschefback(value[index]);
 884 +               } else {
 885 +               /* Otherwise, we do it via MTTR */
 886 +                       settc(number[index]);
 887 +                       haltstate = read_tc_c0_tchalt();
 888 +                       write_tc_c0_tchalt(TCHALT_H);
 889 +                       mips_ihb();
 890 +                       if(entity[index] == 't')
 891 +                                write_tc_c0_tcschedule(value[index]);
 892 +                       else
 893 +                               write_tc_c0_tcschefback(value[index]);
 894 +                       mips_ihb();
 895 +                       if(!haltstate) write_tc_c0_tchalt(0);
 896 +               }
 897 +       } else if(entity[index] == 'v') {
 898 +               /* Set VPESchedule of specified VPE */
 899 +               if(number[index] > NVPES) goto skip;
 900 +               tcbindval = read_c0_tcbind();
 901 +               /* Are we doing this to our current VPE? */
 902 +               if((tcbindval & TCBIND_CURVPE) == number[index]) {
 903 +                       /* Then life is simple */
 904 +                       write_c0_vpeschedule(value[index]);
 905 +               } else {
 906 +                       /*
 907 +                        * Bind ourselves to the other VPE long enough
 908 +                        * to program the bind value.
 909 +                        */
 910 +                       write_c0_tcbind((tcbindval & ~TCBIND_CURVPE)
 911 +                                          | number[index]);
 912 +                       mips_ihb();
 913 +                       write_c0_vpeschedule(value[index]);
 914 +                       mips_ihb();
 915 +                       /* Restore previous binding */
 916 +                       write_c0_tcbind(tcbindval);
 917 +                       mips_ihb();
 918 +               }
 919 +       }
 920 +
 921 +       else if(entity[index] == 'r') {
 922 +               unsigned int vpes_checked[2], vpe ,i , mytc;
 923 +               vpes_checked[0] = vpes_checked[1] = 0;
 924 +
 925 +               /* Then go through the TCs, halt 'em, and extract the values */
 926 +               mytc = (read_c0_tcbind() & TCBIND_CURTC) >> TCBIND_CURTC_SHIFT;
 927 +
 928 +               for(i = 0; i < NTCS; i++) {
 929 +                       if(i == mytc) {
 930 +                               /* No need to halt ourselves! */
 931 +                               write_c0_vpeschefback(0);
 932 +                               write_c0_tcschefback(0);
 933 +                       } else {
 934 +                               settc(i);
 935 +                               haltstate = read_tc_c0_tchalt();
 936 +                               write_tc_c0_tchalt(TCHALT_H);
 937 +                               mips_ihb();
 938 +                               write_tc_c0_tcschefback(0);
 939 +                               /* If VPE bound to TC hasn't been checked, do it */
 940 +                               vpe = read_tc_c0_tcbind() & TCBIND_CURVPE;
 941 +                               if(!vpes_checked[vpe]) {
 942 +                                   write_vpe_c0_vpeschefback(0);
 943 +                                   vpes_checked[vpe] = 1;
 944 +                               }
 945 +                               if(!haltstate) write_tc_c0_tchalt(0);
 946 +                       }
 947 +               }
 948 +       }
 949 +       else {
 950 +               printk ("\n Usage : <t/v><0/1> <Hex Value>\n Example : t0 0x01\n");
 951 +       }
 952 +
 953 +skip:
 954 +       /* Re-enable MT and interrupts */
 955 +       evpe(mtflags);
 956 +       local_irq_restore(flags);
 957 +       return (len);
 958 +}
 959 +
 960 +static int __init init_mtsched_proc(void)
 961 +{
 962 +       extern struct proc_dir_entry *get_mips_proc_dir(void);
 963 +       struct proc_dir_entry *mips_proc_dir;
 964 +
 965 +       if (!cpu_has_mipsmt) {
 966 +               printk("mtsched: not a MIPS MT capable processor\n");
 967 +               return -ENODEV;
 968 +       }
 969 +
 970 +       mips_proc_dir = get_mips_proc_dir();
 971 +
 972 +       mtsched_proc = create_proc_entry("mtsched", 0644, mips_proc_dir);
 973 +       mtsched_proc->read_proc = proc_read_mtsched;
 974 +       mtsched_proc->write_proc = proc_write_mtsched;
 975 +
 976 +       return 0;
 977 +}
 978 +
 979 +/* Automagically create the entry */
 980 +module_init(init_mtsched_proc);
 981 --- /dev/null
 982 +++ b/arch/mips/kernel/perf_proc.c
 983 @@ -0,0 +1,191 @@
 984 +/*
 985 + * /proc hooks for CPU performance counter support for SMTC kernel
 986 + * (and ultimately others)
 987 + * Copyright (C) 2006 Mips Technologies, Inc
 988 + */
 989 +
 990 +#include <linux/kernel.h>
 991 +
 992 +#include <asm/cpu.h>
 993 +#include <asm/processor.h>
 994 +#include <asm/system.h>
 995 +#include <asm/mipsregs.h>
 996 +#include <asm/uaccess.h>
 997 +#include <linux/proc_fs.h>
 998 +
 999 +/*
1000 + * /proc diagnostic and statistics hooks
1001 + */
1002 +
1003 +
1004 +/* Internal software-extended event counters */
1005 +
1006 +static unsigned long long extencount[4] = {0,0,0,0};
1007 +
1008 +static struct proc_dir_entry *perf_proc;
1009 +
1010 +static int proc_read_perf(char *page, char **start, off_t off,
1011 +                               int count, int *eof, void *data)
1012 +{
1013 +       int totalen = 0;
1014 +       int len;
1015 +
1016 +       len = sprintf(page, "PerfCnt[0].Ctl : 0x%08x\n", read_c0_perfctrl0());
1017 +       totalen += len;
1018 +       page += len;
1019 +       len = sprintf(page, "PerfCnt[0].Cnt : %Lu\n",
1020 +               extencount[0] + (unsigned long long)((unsigned)read_c0_perfcntr0()));
1021 +       totalen += len;
1022 +       page += len;
1023 +       len = sprintf(page, "PerfCnt[1].Ctl : 0x%08x\n", read_c0_perfctrl1());
1024 +       totalen += len;
1025 +       page += len;
1026 +       len = sprintf(page, "PerfCnt[1].Cnt : %Lu\n",
1027 +               extencount[1] + (unsigned long long)((unsigned)read_c0_perfcntr1()));
1028 +       totalen += len;
1029 +       page += len;
1030 +       len = sprintf(page, "PerfCnt[2].Ctl : 0x%08x\n", read_c0_perfctrl2());
1031 +       totalen += len;
1032 +       page += len;
1033 +       len = sprintf(page, "PerfCnt[2].Cnt : %Lu\n",
1034 +               extencount[2] + (unsigned long long)((unsigned)read_c0_perfcntr2()));
1035 +       totalen += len;
1036 +       page += len;
1037 +       len = sprintf(page, "PerfCnt[3].Ctl : 0x%08x\n", read_c0_perfctrl3());
1038 +       totalen += len;
1039 +       page += len;
1040 +       len = sprintf(page, "PerfCnt[3].Cnt : %Lu\n",
1041 +               extencount[3] + (unsigned long long)((unsigned)read_c0_perfcntr3()));
1042 +       totalen += len;
1043 +       page += len;
1044 +
1045 +       return totalen;
1046 +}
1047 +
1048 +/*
1049 + * Write to perf counter registers based on text input
1050 + */
1051 +
1052 +#define TXTBUFSZ 100
1053 +
1054 +static int proc_write_perf(struct file *file, const char *buffer,
1055 +                               unsigned long count, void *data)
1056 +{
1057 +       int len;
1058 +       int nparsed;
1059 +       int index;
1060 +       char mybuf[TXTBUFSZ];
1061 +
1062 +       int which[4];
1063 +       unsigned long control[4];
1064 +       long long ctrdata[4];
1065 +
1066 +       if(count >= TXTBUFSZ) len = TXTBUFSZ-1;
1067 +       else len = count;
1068 +       memset(mybuf,0,TXTBUFSZ);
1069 +       if(copy_from_user(mybuf, buffer, len)) return -EFAULT;
1070 +
1071 +       nparsed = sscanf(mybuf,
1072 +                       "%d %lx %Ld %d %lx %Ld %d %lx %Ld %d %lx %Ld",
1073 +                               &which[0], &control[0], &ctrdata[0],
1074 +                               &which[1], &control[1], &ctrdata[1],
1075 +                               &which[2], &control[2], &ctrdata[2],
1076 +                               &which[3], &control[3], &ctrdata[3]);
1077 +
1078 +       for(index = 0; nparsed >= 3; index++) {
1079 +               switch (which[index]) {
1080 +               case 0:
1081 +                       write_c0_perfctrl0(control[index]);
1082 +                       if(ctrdata[index] != -1) {
1083 +                           extencount[0] = (unsigned long long)ctrdata[index];
1084 +                           write_c0_perfcntr0((unsigned long)0);
1085 +                       }
1086 +                       break;
1087 +               case 1:
1088 +                       write_c0_perfctrl1(control[index]);
1089 +                       if(ctrdata[index] != -1) {
1090 +                           extencount[1] = (unsigned long long)ctrdata[index];
1091 +                           write_c0_perfcntr1((unsigned long)0);
1092 +                       }
1093 +                       break;
1094 +               case 2:
1095 +                       write_c0_perfctrl2(control[index]);
1096 +                       if(ctrdata[index] != -1) {
1097 +                           extencount[2] = (unsigned long long)ctrdata[index];
1098 +                           write_c0_perfcntr2((unsigned long)0);
1099 +                       }
1100 +                       break;
1101 +               case 3:
1102 +                       write_c0_perfctrl3(control[index]);
1103 +                       if(ctrdata[index] != -1) {
1104 +                           extencount[3] = (unsigned long long)ctrdata[index];
1105 +                           write_c0_perfcntr3((unsigned long)0);
1106 +                       }
1107 +                       break;
1108 +               }
1109 +               nparsed -= 3;
1110 +       }
1111 +       return (len);
1112 +}
1113 +
1114 +extern int (*perf_irq)(void);
1115 +
1116 +/*
1117 + * Invoked when timer interrupt vector picks up a perf counter overflow
1118 + */
1119 +
1120 +static int perf_proc_irq(void)
1121 +{
1122 +       unsigned long snapshot;
1123 +
1124 +       /*
1125 +        * It would be nice to do this as a loop, but we don't have
1126 +        * indirect access to CP0 registers.
1127 +        */
1128 +       snapshot = read_c0_perfcntr0();
1129 +       if ((long)snapshot < 0) {
1130 +               extencount[0] +=
1131 +                       (unsigned long long)((unsigned)read_c0_perfcntr0());
1132 +               write_c0_perfcntr0(0);
1133 +       }
1134 +       snapshot = read_c0_perfcntr1();
1135 +       if ((long)snapshot < 0) {
1136 +               extencount[1] +=
1137 +                       (unsigned long long)((unsigned)read_c0_perfcntr1());
1138 +               write_c0_perfcntr1(0);
1139 +       }
1140 +       snapshot = read_c0_perfcntr2();
1141 +       if ((long)snapshot < 0) {
1142 +               extencount[2] +=
1143 +                       (unsigned long long)((unsigned)read_c0_perfcntr2());
1144 +               write_c0_perfcntr2(0);
1145 +       }
1146 +       snapshot = read_c0_perfcntr3();
1147 +       if ((long)snapshot < 0) {
1148 +               extencount[3] +=
1149 +                       (unsigned long long)((unsigned)read_c0_perfcntr3());
1150 +               write_c0_perfcntr3(0);
1151 +       }
1152 +       return 0;
1153 +}
1154 +
1155 +static int __init init_perf_proc(void)
1156 +{
1157 +       extern struct proc_dir_entry *get_mips_proc_dir(void);
1158 +
1159 +       struct proc_dir_entry *mips_proc_dir = get_mips_proc_dir();
1160 +
1161 +       write_c0_perfcntr0(0);
1162 +       write_c0_perfcntr1(0);
1163 +       write_c0_perfcntr2(0);
1164 +       write_c0_perfcntr3(0);
1165 +       perf_proc = create_proc_entry("perf", 0644, mips_proc_dir);
1166 +       perf_proc->read_proc = proc_read_perf;
1167 +       perf_proc->write_proc = proc_write_perf;
1168 +       perf_irq = perf_proc_irq;
1169 +
1170 +       return 0;
1171 +}
1172 +
1173 +/* Automagically create the entry */
1174 +module_init(init_perf_proc);