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/*

 * Copyright (c) 2003-2004 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup mips32mm   

 * @{

 */

/** @file

 */

#ifndef KERN_mips32_TLB_H_

#define KERN_mips32_TLB_H_

#include <arch/exception.h>

#include <typedefs.h>

#ifdef TLBCNT

#   define TLB_ENTRY_COUNT      TLBCNT

#else

#   define TLB_ENTRY_COUNT      48

#endif

#define TLB_WIRED       1

#define TLB_KSTACK_WIRED_INDEX  0

#define TLB_PAGE_MASK_16K   (0x3<<13)

#define PAGE_UNCACHED           2

#define PAGE_CACHEABLE_EXC_WRITE    5

typedef union entry_lo entry_lo_t;

typedef union entry_hi entry_hi_t;

typedef union page_mask page_mask_t;

typedef union index tlb_index_t;

union entry_lo {

    struct {

#ifdef BIG_ENDIAN

        unsigned : 2;       /* zero */

        unsigned pfn : 24;  /* frame number */

        unsigned c : 3;     /* cache coherency attribute */

        unsigned d : 1;     /* dirty/write-protect bit */

        unsigned v : 1;     /* valid bit */

        unsigned g : 1;     /* global bit */

#else

        unsigned g : 1;     /* global bit */

        unsigned v : 1;     /* valid bit */

        unsigned d : 1;     /* dirty/write-protect bit */

        unsigned c : 3;     /* cache coherency attribute */

        unsigned pfn : 24;  /* frame number */

        unsigned : 2;       /* zero */

#endif

    } __attribute__ ((packed));

    uint32_t value;

};

/** Page Table Entry. */

struct pte {

    unsigned g : 1;         /**< Global bit. */

    unsigned p : 1;         /**< Present bit. */

    unsigned d : 1;         /**< Dirty bit. */

    unsigned cacheable : 1;     /**< Cacheable bit. */

    unsigned : 1;           /**< Unused. */

    unsigned soft_valid : 1;    /**< Valid content even if not present. */

    unsigned pfn : 24;      /**< Physical frame number. */

    unsigned w : 1;         /**< Page writable bit. */

    unsigned a : 1;         /**< Accessed bit. */

};

union entry_hi {

    struct {

#ifdef BIG_ENDIAN

        unsigned vpn2 : 19;

        unsigned : 5;

        unsigned asid : 8;

#else

        unsigned asid : 8;

        unsigned : 5;

        unsigned vpn2 : 19;

#endif

    } __attribute__ ((packed));

    uint32_t value;

};

union page_mask {

    struct {

#ifdef BIG_ENDIAN

        unsigned : 7;

        unsigned mask : 12;

        unsigned : 13;

#else

        unsigned : 13;

        unsigned mask : 12;

        unsigned : 7;

#endif

    } __attribute__ ((packed));

    uint32_t value;

};

union index {

    struct {

#ifdef BIG_ENDIAN

        unsigned p : 1;

        unsigned : 27;

        unsigned index : 4;

#else

        unsigned index : 4;

        unsigned : 27;

        unsigned p : 1;

#endif

    } __attribute__ ((packed));

    uint32_t value;

};

/** Probe TLB for Matching Entry

 *

 * Probe TLB for Matching Entry.

 */

static inline void tlbp(void)

{

    asm volatile ("tlbp\n\t");

}

/** Read Indexed TLB Entry

 *

 * Read Indexed TLB Entry.

 */

static inline void tlbr(void)

{

    asm volatile ("tlbr\n\t");

}

/** Write Indexed TLB Entry

 *

 * Write Indexed TLB Entry.

 */

static inline void tlbwi(void)

{

    asm volatile ("tlbwi\n\t");

}

/** Write Random TLB Entry

 *

 * Write Random TLB Entry.

 */

static inline void tlbwr(void)

{

    asm volatile ("tlbwr\n\t");

}

#define tlb_invalidate(asid)    tlb_invalidate_asid(asid)

extern void tlb_invalid(istate_t *istate);

extern void tlb_refill(istate_t *istate);

extern void tlb_modified(istate_t *istate);

#endif

/** @}

 */