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/*
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 * Copyright (C) 2003-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __mips32_TLB_H__
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#define __mips32_TLB_H__
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#include <arch/exception.h>
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#include <typedefs.h>
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#ifdef TLBCNT
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#	define TLB_ENTRY_COUNT		TLBCNT
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#else
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#	define TLB_ENTRY_COUNT		48
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#endif
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#define TLB_WIRED		1
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#define TLB_KSTACK_WIRED_INDEX	0
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#define TLB_PAGE_MASK_16K	(0x3<<13)
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#define PAGE_UNCACHED			2
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#define PAGE_CACHEABLE_EXC_WRITE	5
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typedef union entry_lo entry_lo_t;
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typedef union entry_hi entry_hi_t;
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typedef union page_mask page_mask_t;
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typedef union index tlb_index_t;
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union entry_lo {
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	struct {
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#ifdef BIG_ENDIAN
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		unsigned : 2;		/* zero */
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		unsigned pfn : 24;	/* frame number */
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		unsigned c : 3; 	/* cache coherency attribute */
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		unsigned d : 1; 	/* dirty/write-protect bit */
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		unsigned v : 1; 	/* valid bit */
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		unsigned g : 1; 	/* global bit */
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#else
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		unsigned g : 1; 	/* global bit */
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		unsigned v : 1; 	/* valid bit */
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		unsigned d : 1; 	/* dirty/write-protect bit */
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		unsigned c : 3; 	/* cache coherency attribute */
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		unsigned pfn : 24;	/* frame number */
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		unsigned : 2;		/* zero */
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#endif
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	} __attribute__ ((packed));
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	__u32 value;
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};
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/** Page Table Entry. */
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struct pte {
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	unsigned g : 1;			/**< Global bit. */
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	unsigned p : 1;			/**< Present bit. */
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	unsigned d : 1;			/**< Dirty bit. */
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	unsigned cacheable : 1;		/**< Cacheable bit. */
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	unsigned : 1;			/**< Unused. */
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	unsigned soft_valid : 1;	/**< Valid content even if not present. */
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	unsigned pfn : 24;		/**< Physical frame number. */
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	unsigned w : 1;			/**< Page writable bit. */
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	unsigned a : 1;			/**< Accessed bit. */
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};
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union entry_hi {
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	struct {
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#ifdef BIG_ENDIAN
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		unsigned vpn2 : 19;
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		unsigned : 5;
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		unsigned asid : 8;
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#else
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		unsigned asid : 8;
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		unsigned : 5;
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		unsigned vpn2 : 19;
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#endif
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	} __attribute__ ((packed));
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	__u32 value;
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};
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union page_mask {
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	struct {
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#ifdef BIG_ENDIAN
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		unsigned : 7;
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		unsigned mask : 12;
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		unsigned : 13;
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#else
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		unsigned : 13;
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		unsigned mask : 12;
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		unsigned : 7;
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#endif
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	} __attribute__ ((packed));
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	__u32 value;
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};
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union index {
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	struct {
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#ifdef BIG_ENDIAN
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		unsigned p : 1;
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		unsigned : 27;
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		unsigned index : 4;
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#else
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		unsigned index : 4;
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		unsigned : 27;
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		unsigned p : 1;
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#endif
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	} __attribute__ ((packed));
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	__u32 value;
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};
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/** Probe TLB for Matching Entry
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 *
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 * Probe TLB for Matching Entry.
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 */
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static inline void tlbp(void)
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{
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	__asm__ volatile ("tlbp\n\t");
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}
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/** Read Indexed TLB Entry
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 *
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 * Read Indexed TLB Entry.
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 */
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static inline void tlbr(void)
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{
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	__asm__ volatile ("tlbr\n\t");
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}
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/** Write Indexed TLB Entry
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 *
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 * Write Indexed TLB Entry.
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 */
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static inline void tlbwi(void)
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{
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	__asm__ volatile ("tlbwi\n\t");
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}
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/** Write Random TLB Entry
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 *
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 * Write Random TLB Entry.
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 */
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static inline void tlbwr(void)
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{
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	__asm__ volatile ("tlbwr\n\t");
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}
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#define tlb_invalidate(asid)	tlb_invalidate_asid(asid)
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extern void tlb_invalid(istate_t *istate);
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extern void tlb_refill(istate_t *istate);
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extern void tlb_modified(istate_t *istate);
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#endif