Initial commit of OpenSPARC T2 architecture model.

[OpenSPARC-T2-SAM] / sam-t2 / sam / devices / dummy_mods / tod / tod.cc

// ========== Copyright Header Begin ==========================================
// 
// OpenSPARC T2 Processor File: tod.cc
// Copyright (c) 2006 Sun Microsystems, Inc.  All Rights Reserved.
// DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.
// 
// The above named program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License version 2 as published by the Free Software Foundation.
// 
// The above named program is distributed in the hope that it will be 
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
// 
// You should have received a copy of the GNU General Public
// License along with this work; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
// 
// ========== Copyright Header End ============================================
/* File: tod.cc
 * 
 * Fake time of the day device. 
 * Returns time from the host machine. 
 *
 * Copyright (c) 2006 by Sun Microsystems, Inc.
 * All rights reserved.
 *
 */



#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/syscall.h>	// get exec number
#include <sys/types.h>		// uid_t
#include <unistd.h>		// getuid()
#include <inttypes.h>
#include <stdarg.h>

#include <thread.h>

#include "mmi.h"
#include "ui.h"

struct sam_tod_s {
  uint64_t startpa;
  uint64_t endpa;
  uint64_t sz;
}; // struct sam_tod.C


extern "C" int	tod_access(uint32_t cpuid, void* obj, uint64_t paddr, mmi_bool_t wr, uint32_t size, uint64_t* buf, uint8_t bytemask);

int	tod_ld_operation (void *cd, uint64_t paddr, uint64_t *buf, int sz, uint32_t cpuid);
int	tod_st_operation (void *cd, uint64_t paddr, uint64_t *buf, int sz, uint32_t cpuid);

extern "C" void tod_create_instance (const char *modname, const char *instance_name);


extern "C" void _init()
{
  if (! mmi_register_instance_creator("tod", tod_create_instance) ) {
    ui->error("Cannot register instance creator for tod\n");
  }
} // _init()



void tod_create_instance (const char *modname, const char *instance_name)
{
  sam_tod_s * tod_obj = new sam_tod_s;

  mmi_instance_t instance = mmi_register_instance(modname, instance_name, (void *) &tod_obj, "tod dummy device");

  tod_obj->startpa = 0x0;
  tod_obj->endpa = 0x0;
  tod_obj->sz = 0;

  // expected syntax: sysconf tod tod1 startpa=<0xblah> endpa=<0xblah>
  int argc = mmi_argc(instance);
  int i;

  for (i=0; i<argc; i++) {
    char * arg = strdup(mmi_argv(instance, i));
    char * marker;
    char * lv = strtok_r(arg, "=", &marker);
    if (strcmp(lv, "startpa") == 0) {
      errno = 0;
      char * rv = strtok_r(NULL, "=", &marker);
      tod_obj->startpa = strtoull(rv, NULL, 0);
      if (errno) {
        perror("tod: error parsing startpa");
        exit(1);
      }
    } else if (strcmp(lv, "endpa") == 0) {
      errno = 0;
      char * rv = strtok_r(NULL, "=", &marker);
      tod_obj->endpa = strtoull(rv, NULL, 0);
      if (errno) {
        perror("tod: error parsing endpa");
        exit(1);
      }
    } // else - do nothing
  }

  tod_obj->sz = tod_obj->endpa - tod_obj->startpa + 1;
  if (mmi_map_physio(tod_obj->startpa, tod_obj->sz, (void *) tod_obj, tod_access)) { 
    ui->error("  sam tod: unable to register IO interceptor\n");
    return;
  }
}


int tod_access(uint32_t cpuid, void* obj, uint64_t paddr, mmi_bool_t wr, uint32_t size, uint64_t* buf, uint8_t bytemask)
{
  if (wr) {
    return tod_st_operation(obj, paddr, buf, size, cpuid);
  } else {
    return tod_ld_operation(obj, paddr, buf, size, cpuid);
  }
} // tod_access()

int tod_ld_operation (void *obj, uint64_t paddr, uint64_t *buf, int size, uint32_t cpuid)
{
    sam_tod_s * tod_obj = (sam_tod_s *) obj;
    uint64_t offset = paddr - tod_obj->startpa;

    if ((offset == 0) && (size == 8)) 
    {
        // time of the day
        *buf = time(NULL); 
    }
    else
    {
        *buf = 0;
        fprintf(stderr, "SAM tod: ld_operation pa 0x%llx size %d cpu %d\n", paddr, size, cpuid);
    }

    return 0;
} // int tod_ld_operation ()


int tod_st_operation (void *obj, uint64_t paddr, uint64_t *buf, int size, uint32_t cpuid)
{
    fprintf(stderr, "SAM tod: st_operation pa 0x%llx size %d cpu %d, ignored\n", paddr, size, cpuid);

    return 0;
} // int tod_st_operation ()


/////////////////////////////////////////////////

extern "C" void _fini ()
{
}

/////////////////////////////////////////////////