sam-t2/sam/cpus/vonk/ss/lib/cpu/src/SS_Tlb.cc

// ========== Copyright Header Begin ==========================================
//
// OpenSPARC T2 Processor File: SS_Tlb.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 ============================================

#include <string.h>
#include "SS_Tlb.h"
#include "SS_Strand.h"

uint_t SS_Tlb::tlb_id_no = 0;

SS_Tlb::SS_Tlb( Type type, uint_t size )/*{{{*/
 :
  clone(ss_clone),
  tlb_ident(tlb_id_no),
  tlb_type(type),
  tlb_size(size),
  ptr_table(0),
  generation_count(0),
  not_a_clone(true),
  strand_list(0),
  no_strands(0),
  tte_list(0)
{
  tlb_id_no++;

  ptr_table = (SS_Tte**)ss_malloc(sizeof(SS_Tte*) * tlb_size);

  for (uint_t i = 0; i < tlb_size; i++)
    ptr_table[i] = alloc_tte(i);
}
/*}}}*/
SS_Tlb::SS_Tlb( SS_Tlb& tlb )/*{{{*/
 :
  clone(tlb.clone),
  tlb_type(tlb.tlb_type),
  tlb_size(tlb.tlb_size),
  ptr_table(0),
  not_a_clone(false),           // only the original not a clone tlb shoud destruct the strands list
  strand_list(tlb.strand_list),         // the structure can be shared ... not_a_clone controls destructing
  no_strands(tlb.no_strands),
  tte_list(tlb.tte_list)
{
  ptr_table = (SS_Tte**)ss_malloc(sizeof(SS_Tte*) * tlb_size);
  memcpy(ptr_table,tlb.ptr_table,sizeof(SS_Tte*) * tlb_size);
  tlb.tte_list = 0;             // Avoid having the free list at two places
}
/*}}}*/
SS_Tlb::~SS_Tlb()/*{{{*/
{
  free(ptr_table);
}
/*}}}*/
SS_Tlb* SS_Tlb::ss_clone( SS_Tlb* tlb )/*{{{*/
{
  return new SS_Tlb(*tlb);
}
/*}}}*/

void SS_Tlb::add_strand( SS_Strand* strand )/*{{{*/
{
  tlb_access.lock();
  ++no_strands;
  strand_list = new Node(strand,strand_list);
  tlb_access.unlock();
}
/*}}}*/
void SS_Tlb::rem_strand( SS_Strand* strand )/*{{{*/
{
  tlb_access.lock();
  assert(no_strands);
  --no_strands;

  Node* head = strand_list;

  if (head->strand == strand)
  {
    strand_list = head->next;
    delete head;
    tlb_access.unlock();
    return;
  }
  else
  {
    int i = 0;
    for (Node* next = head->next; strand && next; head = next, next = next->next)
    {
      assert (++i <= no_strands);
      if (next->strand == strand)
      {
        strand = 0;
        head->next = next->next;
        delete next;
        tlb_access.unlock();
        return;
      }
    }
  }
  assert(0);
  tlb_access.unlock();
}
/*}}}*/

SS_Tte* SS_Tlb::alloc_tte_block()/*{{{*/
{
  const SIZE = 64;

  SS_Tte* next  = 0;
  SS_Tte* block = (SS_Tte*)ss_malloc(sizeof(SS_Tte) * SIZE);
  for (uint_t i = 1; i < SIZE; i++)
  {
    new(&block[i]) SS_Tte();
    block[i].next = next;
    next = &block[i];
  }
  tte_list = next;

  new(block) SS_Tte();

  return block;
}
/*}}}*/

void SS_Tlb::dump(FILE *fp)/*{{{*/
{
  tlb_access.lock();
  for (int i=0; i < size(); i++)
  {
    if (ptr_table[i]->valid())
    {
      fprintf(fp,"%04x ",i);
      ptr_table[i]->dump(fp);
    }
  }
  tlb_access.unlock();
}
/*}}}*/