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/*

 * Copyright (C) 2005 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.

 */

#ifndef __sparc64_TLB_H__

#define __sparc64_TLB_H__

#include <arch/mm/tte.h>

#include <arch/mm/mmu.h>

#include <arch/mm/page.h>

#include <arch/asm.h>

#include <arch/barrier.h>

#include <arch/types.h>

#include <typedefs.h>

#define ITLB_ENTRY_COUNT        64

#define DTLB_ENTRY_COUNT        64

/** Page sizes. */

#define PAGESIZE_8K 0

#define PAGESIZE_64K    1

#define PAGESIZE_512K   2

#define PAGESIZE_4M 3

/** Bit width of the TLB-locked portion of kernel address space. */

#define KERNEL_PAGE_WIDTH       22  /* 4M */

union tlb_context_reg {

    __u64 v;

    struct {

        unsigned long : 51;

        unsigned context : 13;      /**< Context/ASID. */

    } __attribute__ ((packed));

};

typedef union tlb_context_reg tlb_context_reg_t;

/** I-/D-TLB Data In/Access Register type. */

typedef tte_data_t tlb_data_t;

/** I-/D-TLB Data Access Address in Alternate Space. */

union tlb_data_access_addr {

    __u64 value;

    struct {

        __u64 : 55;

        unsigned tlb_entry : 6;

        unsigned : 3;

    } __attribute__ ((packed));

};

typedef union tlb_data_access_addr tlb_data_access_addr_t;

typedef union tlb_data_access_addr tlb_tag_read_addr_t;

/** I-/D-TLB Tag Read Register. */

union tlb_tag_read_reg {

    __u64 value;

    struct {

        __u64 vpn : 51;     /**< Virtual Address bits 63:13. */

        unsigned context : 13;  /**< Context identifier. */

    } __attribute__ ((packed));

};

typedef union tlb_tag_read_reg tlb_tag_read_reg_t;

typedef union tlb_tag_read_reg tlb_tag_access_reg_t;

/** TLB Demap Operation types. */

#define TLB_DEMAP_PAGE      0

#define TLB_DEMAP_CONTEXT   1

/** TLB Demap Operation Context register encodings. */

#define TLB_DEMAP_PRIMARY   0

#define TLB_DEMAP_SECONDARY 1

#define TLB_DEMAP_NUCLEUS   2

/** TLB Demap Operation Address. */

union tlb_demap_addr {

    __u64 value;

    struct {

        __u64 vpn: 51;      /**< Virtual Address bits 63:13. */

        unsigned : 6;       /**< Ignored. */

        unsigned type : 1;  /**< The type of demap operation. */

        unsigned context : 2;   /**< Context register selection. */

        unsigned : 4;       /**< Zero. */

    } __attribute__ ((packed));

};

typedef union tlb_demap_addr tlb_demap_addr_t;

/** TLB Synchronous Fault Status Register. */

union tlb_sfsr_reg {

    __u64 value;

    struct {

        unsigned long : 39; /**< Implementation dependent. */

        unsigned nf : 1;    /**< Nonfaulting load. */

        unsigned asi : 8;   /**< ASI. */

        unsigned tm : 1;    /**< TLB miss. */

        unsigned : 1;

        unsigned ft : 7;    /**< Fault type. */

        unsigned e : 1;     /**< Side-effect bit. */

        unsigned ct : 2;    /**< Context Register selection. */

        unsigned pr : 1;    /**< Privilege bit. */

        unsigned w : 1;     /**< Write bit. */

        unsigned ow : 1;    /**< Overwrite bit. */

        unsigned fv : 1;    /**< Fault Valid bit. */

    } __attribute__ ((packed));

};

typedef union tlb_sfsr_reg tlb_sfsr_reg_t;

/** Read MMU Primary Context Register.

 *

 * @return Current value of Primary Context Register.

 */

static inline __u64 mmu_primary_context_read(void)

{

    return asi_u64_read(ASI_DMMU, VA_PRIMARY_CONTEXT_REG);

}

/** Write MMU Primary Context Register.

 *

 * @param v New value of Primary Context Register.

 */

static inline void mmu_primary_context_write(__u64 v)

{

    asi_u64_write(ASI_DMMU, VA_PRIMARY_CONTEXT_REG, v);

    flush();

}

/** Read MMU Secondary Context Register.

 *

 * @return Current value of Secondary Context Register.

 */

static inline __u64 mmu_secondary_context_read(void)

{

    return asi_u64_read(ASI_DMMU, VA_SECONDARY_CONTEXT_REG);

}

/** Write MMU Primary Context Register.

 *

 * @param v New value of Primary Context Register.

 */

static inline void mmu_secondary_context_write(__u64 v)

{

    asi_u64_write(ASI_DMMU, VA_PRIMARY_CONTEXT_REG, v);

    flush();

}

/** Read IMMU TLB Data Access Register.

 *

 * @param entry TLB Entry index.

 *

 * @return Current value of specified IMMU TLB Data Access Register.

 */

static inline __u64 itlb_data_access_read(index_t entry)

{

    tlb_data_access_addr_t reg;

    reg.value = 0;

    reg.tlb_entry = entry;

    return asi_u64_read(ASI_ITLB_DATA_ACCESS_REG, reg.value);

}

/** Write IMMU TLB Data Access Register.

 *

 * @param entry TLB Entry index.

 * @param value Value to be written.

 */

static inline void itlb_data_access_write(index_t entry, __u64 value)

{

    tlb_data_access_addr_t reg;

    reg.value = 0;

    reg.tlb_entry = entry;

    asi_u64_write(ASI_ITLB_DATA_ACCESS_REG, reg.value, value);

    flush();

}

/** Read DMMU TLB Data Access Register.

 *

 * @param entry TLB Entry index.

 *

 * @return Current value of specified DMMU TLB Data Access Register.

 */

static inline __u64 dtlb_data_access_read(index_t entry)

{

    tlb_data_access_addr_t reg;

    reg.value = 0;

    reg.tlb_entry = entry;

    return asi_u64_read(ASI_DTLB_DATA_ACCESS_REG, reg.value);

}

/** Write DMMU TLB Data Access Register.

 *

 * @param entry TLB Entry index.

 * @param value Value to be written.

 */

static inline void dtlb_data_access_write(index_t entry, __u64 value)

{

    tlb_data_access_addr_t reg;

    reg.value = 0;

    reg.tlb_entry = entry;

    asi_u64_write(ASI_DTLB_DATA_ACCESS_REG, reg.value, value);

    flush();

}

/** Read IMMU TLB Tag Read Register.

 *

 * @param entry TLB Entry index.

 *

 * @return Current value of specified IMMU TLB Tag Read Register.

 */

static inline __u64 itlb_tag_read_read(index_t entry)

{

    tlb_tag_read_addr_t tag;

    tag.value = 0;

    tag.tlb_entry = entry;

    return asi_u64_read(ASI_ITLB_TAG_READ_REG, tag.value);

}

/** Read DMMU TLB Tag Read Register.

 *

 * @param entry TLB Entry index.

 *

 * @return Current value of specified DMMU TLB Tag Read Register.

 */

static inline __u64 dtlb_tag_read_read(index_t entry)

{

    tlb_tag_read_addr_t tag;

    tag.value = 0;

    tag.tlb_entry = entry;

    return asi_u64_read(ASI_DTLB_TAG_READ_REG, tag.value);

}

/** Write IMMU TLB Tag Access Register.

 *

 * @param v Value to be written.

 */

static inline void itlb_tag_access_write(__u64 v)

{

    asi_u64_write(ASI_IMMU, VA_IMMU_TAG_ACCESS, v);

    flush();

}

/** Read IMMU TLB Tag Access Register.

 *

 * @return Current value of IMMU TLB Tag Access Register.

 */

static inline __u64 itlb_tag_access_read(void)

{

    return asi_u64_read(ASI_IMMU, VA_IMMU_TAG_ACCESS);

}

/** Write DMMU TLB Tag Access Register.

 *

 * @param v Value to be written.

 */

static inline void dtlb_tag_access_write(__u64 v)

{

    asi_u64_write(ASI_DMMU, VA_DMMU_TAG_ACCESS, v);

    flush();

}

/** Read DMMU TLB Tag Access Register.

 *

 * @return Current value of DMMU TLB Tag Access Register.

 */

static inline __u64 dtlb_tag_access_read(void)

{

    return asi_u64_read(ASI_DMMU, VA_DMMU_TAG_ACCESS);

}

/** Write IMMU TLB Data in Register.

 *

 * @param v Value to be written.

 */

static inline void itlb_data_in_write(__u64 v)

{

    asi_u64_write(ASI_ITLB_DATA_IN_REG, 0, v);

    flush();

}

/** Write DMMU TLB Data in Register.

 *

 * @param v Value to be written.

 */

static inline void dtlb_data_in_write(__u64 v)

{

    asi_u64_write(ASI_DTLB_DATA_IN_REG, 0, v);

    flush();

}

/** Read ITLB Synchronous Fault Status Register.

 *

 * @return Current content of I-SFSR register.

 */

static inline __u64 itlb_sfsr_read(void)

{

    return asi_u64_read(ASI_IMMU, VA_IMMU_SFSR);

}

/** Write ITLB Synchronous Fault Status Register.

 *

 * @param v New value of I-SFSR register.

 */

static inline void itlb_sfsr_write(__u64 v)

{

    asi_u64_write(ASI_IMMU, VA_IMMU_SFSR, v);

    flush();

}

/** Read DTLB Synchronous Fault Status Register.

 *

 * @return Current content of D-SFSR register.

 */

static inline __u64 dtlb_sfsr_read(void)

{

    return asi_u64_read(ASI_DMMU, VA_DMMU_SFSR);

}

/** Write DTLB Synchronous Fault Status Register.

 *

 * @param v New value of D-SFSR register.

 */

static inline void dtlb_sfsr_write(__u64 v)

{

    asi_u64_write(ASI_DMMU, VA_DMMU_SFSR, v);

    flush();

}

/** Read DTLB Synchronous Fault Address Register.

 *

 * @return Current content of D-SFAR register.

 */

static inline __u64 dtlb_sfar_read(void)

{

    return asi_u64_read(ASI_DMMU, VA_DMMU_SFAR);

}

/** Perform IMMU TLB Demap Operation.

 *

 * @param type Selects between context and page demap.

 * @param context_encoding Specifies which Context register has Context ID for demap.

 * @param page Address which is on the page to be demapped.

 */

static inline void itlb_demap(int type, int context_encoding, __address page)

{

    tlb_demap_addr_t da;

    page_address_t pg;

    da.value = 0;

    pg.address = page;

    da.type = type;

    da.context = context_encoding;

    da.vpn = pg.vpn;

    asi_u64_write(ASI_IMMU_DEMAP, da.value, 0);

    flush();

}

/** Perform DMMU TLB Demap Operation.

 *

 * @param type Selects between context and page demap.

 * @param context_encoding Specifies which Context register has Context ID for demap.

 * @param page Address which is on the page to be demapped.

 */

static inline void dtlb_demap(int type, int context_encoding, __address page)

{

    tlb_demap_addr_t da;

    page_address_t pg;

    da.value = 0;

    pg.address = page;

    da.type = type;

    da.context = context_encoding;

    da.vpn = pg.vpn;

    asi_u64_write(ASI_DMMU_DEMAP, da.value, 0);

    flush();

}

extern void fast_instruction_access_mmu_miss(void);

extern void fast_data_access_mmu_miss(void);

extern void fast_data_access_protection(void);

extern void dtlb_insert_mapping(__address page, __address frame, int pagesize, bool locked, bool cacheable);

#endif