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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

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 : 3;

		unsigned ft : 5;	/**< 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;	/**< Fayult 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();

}

/** 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();

}

/** 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);

#endif