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/* dmmu.h -- Data MMU header file

   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org

   This file is part of OpenRISC 1000 Architectural Simulator.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2 of the License, or

   (at your option) any later version.

   This 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 program; if not, write to the Free Software

   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

/* FIXME: Move to dmmu.c once the dust settles */

struct dmmu {

  int enabled;                      /* Whether DMMU is enabled */

  int nways;                        /* Number of DTLB ways */

  int nsets;                        /* Number of DTLB sets */

  int pagesize;                     /* DTLB page size */

  int pagesize_log2;                /* DTLB page size (log2(pagesize)) */

  oraddr_t page_offset_mask;        /* Address mask to get page offset */

  oraddr_t page_mask;               /* Page number mask (diff. from vpn) */

  oraddr_t vpn_mask;                /* Address mask to get vpn */

  int lru_reload;                   /* What to reload the lru value to */

  oraddr_t set_mask;                /* Mask to get set of an address */

  int entrysize;                    /* DTLB entry size */

  int ustates;                      /* number of DTLB usage states */

  int missdelay;                    /* How much cycles does the miss cost */

  int hitdelay;                     /* How much cycles does the hit cost */

};

#define DADDR_PAGE(addr) ((addr) & dmmu_state->page_mask)

/* FIXME: Remove the need for this global */

extern struct dmmu *dmmu_state;

oraddr_t dmmu_translate(oraddr_t virtaddr, int write_access);

oraddr_t dmmu_simulate_tlb(oraddr_t virtaddr, int write_access);

oraddr_t peek_into_dtlb(oraddr_t virtaddr, int write_access, int through_dc);