Bochs/bochs/cpu/cpuid.cc

/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
//   Copyright (c) 2014 Stanislav Shwartsman
//          Written by Stanislav Shwartsman [sshwarts at sourceforge net]
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2 of the License, or (at your option) any later version.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
//
/////////////////////////////////////////////////////////////////////////

#include "bochs.h"
#include "cpu.h"
#include "param_names.h"
#include "cpuid.h"

#define LOG_THIS cpu->

bx_cpuid_t::bx_cpuid_t(BX_CPU_C *_cpu): cpu(_cpu)
{
#if BX_SUPPORT_SMP
  nthreads = SIM->get_param_num(BXPN_CPU_NTHREADS)->get();
  ncores = SIM->get_param_num(BXPN_CPU_NCORES)->get();
  nprocessors = SIM->get_param_num(BXPN_CPU_NPROCESSORS)->get();
#else
  nthreads = 1;
  ncores = 1;
  nprocessors = 1;
#endif

  for (unsigned n=0; n < BX_ISA_EXTENSIONS_ARRAY_SIZE; n++)
    ia_extensions_bitmask[n] = 0;
}

BX_CPP_INLINE static Bit32u ilog2(Bit32u x)
{
  Bit32u count = 0;
  while(x>>=1) count++;
  return count;
}

// leaf 0x0000000B //
void bx_cpuid_t::get_std_cpuid_extended_topology_leaf(Bit32u subfunction, cpuid_function_t *leaf) const
{
  // CPUID function 0x0000000B - Extended Topology Leaf
  leaf->eax = 0;
  leaf->ebx = 0;
  leaf->ecx = subfunction;
  leaf->edx = cpu->get_apic_id();

#if BX_SUPPORT_SMP
  switch(subfunction) {
  case 0:
     if (nthreads > 1) {
        leaf->eax = ilog2(nthreads-1)+1;
        leaf->ebx = nthreads;
        leaf->ecx |= (1<<8);
     }
     else if (ncores > 1) {
        leaf->eax = ilog2(ncores-1)+1;
        leaf->ebx = ncores;
        leaf->ecx |= (2<<8);
     }
     else if (nprocessors > 1) {
        leaf->eax = ilog2(nprocessors-1)+1;
        leaf->ebx = nprocessors;
     }
     else {
        leaf->eax = 1;
        leaf->ebx = 1; // number of logical CPUs at this level
     }
     break;

  case 1:
     if (nthreads > 1) {
        if (ncores > 1) {
           leaf->eax = ilog2(ncores-1)+1;
           leaf->ebx = ncores;
           leaf->ecx |= (2<<8);
        }
        else if (nprocessors > 1) {
           leaf->eax = ilog2(nprocessors-1)+1;
           leaf->ebx = nprocessors;
        }
     }
     else if (ncores > 1) {
        if (nprocessors > 1) {
           leaf->eax = ilog2(nprocessors-1)+1;
           leaf->ebx = nprocessors;
        }
     }
     break;

  case 2:
     if (nthreads > 1) {
        if (nprocessors > 1) {
           leaf->eax = ilog2(nprocessors-1)+1;
           leaf->ebx = nprocessors;
        }
     }
     break;

  default:
     break;
  }
#endif
}

void bx_cpuid_t::dump_cpuid(unsigned max_std_leaf, unsigned max_ext_leaf) const
{
  struct cpuid_function_t leaf;
  unsigned n;

  for (n=0; n<=max_std_leaf; n++) {
    get_cpuid_leaf(n, 0x00000000, &leaf);
    BX_INFO(("CPUID[0x%08x]: %08x %08x %08x %08x", n, leaf.eax, leaf.ebx, leaf.ecx, leaf.edx));
  }

  if (max_ext_leaf == 0) return;

  for (n=0x80000000; n<=(0x8000000 + max_ext_leaf); n++) {
    get_cpuid_leaf(n, 0x00000000, &leaf);
    BX_INFO(("CPUID[0x%08x]: %08x %08x %08x %08x", n, leaf.eax, leaf.ebx, leaf.ecx, leaf.edx));
  }
}