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/* immu.h -- Instruction MMU header file
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Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
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Copyright (C) 2008 Embecosm Limited
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Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This program is commented throughout in a fashion suitable for processing
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with Doxygen. */
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#ifndef IMMU__H
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#define IMMU__H
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/* Package includes */
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#include "sim-config.h"
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struct immu
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{
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int enabled; /* Whether IMMU is enabled */
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int nways; /* Number of ITLB ways */
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int nsets; /* Number of ITLB sets */
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oraddr_t pagesize; /* ITLB page size */
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int pagesize_log2; /* ITLB page size (log2(pagesize)) */
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oraddr_t page_offset_mask; /* Address mask to get page offset */
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oraddr_t page_mask; /* Page number mask (diff. from vpn) */
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oraddr_t vpn_mask; /* Address mask to get vpn */
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int lru_reload; /* What to reload the lru value to */
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oraddr_t set_mask; /* Mask to get set of an address */
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int entrysize; /* ITLB entry size */
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int ustates; /* number of ITLB usage states */
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int missdelay; /* How much cycles does the miss cost */
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int hitdelay; /* How much cycles does the hit cost */
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};
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#define IADDR_PAGE(addr) ((addr) & immu_state->page_mask)
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/* FIXME: Remove the need for this global */
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extern struct immu *immu_state;
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/* Prototypes for external use */
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extern oraddr_t immu_translate (oraddr_t virtaddr);
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extern oraddr_t immu_simulate_tlb (oraddr_t virtaddr);
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extern oraddr_t peek_into_itlb (oraddr_t virtaddr);
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extern void reg_immu_sec ();
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#endif /* IMMU__H */
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