source: mainline/kernel/arch/sparc64/include/mm/tlb.h@ 2bf4936

/*
 * 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.
 */

/** @addtogroup sparc64mm       
 * @{
 */
/** @file
 */

#ifndef KERN_sparc64_TLB_H_
#define KERN_sparc64_TLB_H_

#if defined (US)
#define ITLB_ENTRY_COUNT                64
#define DTLB_ENTRY_COUNT                64
#define DTLB_MAX_LOCKED_ENTRIES         DTLB_ENTRY_COUNT
#endif

/** TLB_DSMALL is the only of the three DMMUs that can hold locked entries. */
#if defined (US3)
#define DTLB_MAX_LOCKED_ENTRIES         16
#endif

#define MEM_CONTEXT_KERNEL              0
#define MEM_CONTEXT_TEMP                1

/** 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 */

/* TLB Demap Operation types. */
#define TLB_DEMAP_PAGE          0
#define TLB_DEMAP_CONTEXT       1
#if defined (US3)
#define TLB_DEMAP_ALL           2
#endif

#define TLB_DEMAP_TYPE_SHIFT    6

/* TLB Demap Operation Context register encodings. */
#define TLB_DEMAP_PRIMARY       0
#define TLB_DEMAP_SECONDARY     1
#define TLB_DEMAP_NUCLEUS       2

/* There are more TLBs in one MMU in US3, their codes are defined here. */
#if defined (US3)
/* D-MMU: one small (16-entry) TLB and two big (512-entry) TLBs */
#define TLB_DSMALL      0
#define TLB_DBIG_0      2
#define TLB_DBIG_1      3
        
/* I-MMU: one small (16-entry) TLB and one big TLB */
#define TLB_ISMALL      0
#define TLB_IBIG        2
#endif

#define TLB_DEMAP_CONTEXT_SHIFT 4

/* TLB Tag Access shifts */
#define TLB_TAG_ACCESS_CONTEXT_SHIFT    0
#define TLB_TAG_ACCESS_CONTEXT_MASK     ((1 << 13) - 1)
#define TLB_TAG_ACCESS_VPN_SHIFT        13

#ifndef __ASM__

#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 <arch/register.h>
#include <arch/cpu.h>

union tlb_context_reg {
        uint64_t 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. */

#if defined (US)

union tlb_data_access_addr {
        uint64_t value;
        struct {
                uint64_t : 55;
                unsigned tlb_entry : 6;
                unsigned : 3;
        } __attribute__ ((packed));
};
typedef union tlb_data_access_addr dtlb_data_access_addr_t;
typedef union tlb_data_access_addr dtlb_tag_read_addr_t;
typedef union tlb_data_access_addr itlb_data_access_addr_t;
typedef union tlb_data_access_addr itlb_tag_read_addr_t;

#elif defined (US3)

/*
 * In US3, I-MMU and D-MMU have different formats of the data
 * access register virtual address. In the corresponding
 * structures the member variable for the entry number is
 * called "local_tlb_entry" - it contrasts with the "tlb_entry"
 * for the US data access register VA structure. The rationale
 * behind this is to prevent careless mistakes in the code
 * caused by setting only the entry number and not the TLB
 * number in the US3 code (when taking the code from US). 
 */

union dtlb_data_access_addr {
        uint64_t value;
        struct {
                uint64_t : 45;
                unsigned : 1;
                unsigned tlb_number : 2;
                unsigned : 4;
                unsigned local_tlb_entry : 9;
                unsigned : 3;
        } __attribute__ ((packed));
};
typedef union dtlb_data_access_addr dtlb_data_access_addr_t;
typedef union dtlb_data_access_addr dtlb_tag_read_addr_t;

union itlb_data_access_addr {
        uint64_t value;
        struct {
                uint64_t : 45;
                unsigned : 1;
                unsigned tlb_number : 2;
                unsigned : 6;
                unsigned local_tlb_entry : 7;
                unsigned : 3;
        } __attribute__ ((packed));
};
typedef union itlb_data_access_addr itlb_data_access_addr_t;
typedef union itlb_data_access_addr itlb_tag_read_addr_t;

#endif

/** I-/D-TLB Tag Read Register. */
union tlb_tag_read_reg {
        uint64_t value;
        struct {
                uint64_t 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 Address. */
union tlb_demap_addr {
        uint64_t value;
        struct {
                uint64_t vpn: 51;       /**< Virtual Address bits 63:13. */
#if defined (US)
                unsigned : 6;           /**< Ignored. */
                unsigned type : 1;      /**< The type of demap operation. */
#elif defined (US3)
                unsigned : 5;           /**< Ignored. */
                unsigned type: 2;       /**< The type of demap operation. */
#endif
                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 {
        uint64_t value;
        struct {
#if defined (US)
                unsigned long : 40;     /**< Implementation dependent. */
                unsigned asi : 8;       /**< ASI. */
                unsigned : 2;
                unsigned ft : 7;        /**< Fault type. */
#elif defined (US3)
                unsigned long : 39;     /**< Implementation dependent. */
                unsigned nf : 1;        /**< Non-faulting load. */
                unsigned asi : 8;       /**< ASI. */
                unsigned tm : 1;        /**< I-TLB miss. */
                unsigned : 3;           /**< Reserved. */
                unsigned ft : 5;        /**< Fault type. */
#endif
                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;

#if defined (US3)

/*
 * Functions for determining the number of entries in TLBs. They either return
 * a constant value or a value based on the CPU autodetection.
 */

/**
 * Determine the number of entries in the DMMU's small TLB. 
 */
static inline uint16_t tlb_dsmall_size(void)
{
        return 16;
}

/**
 * Determine the number of entries in each DMMU's big TLB. 
 */
static inline uint16_t tlb_dbig_size(void)
{
        return 512;
}

/**
 * Determine the number of entries in the IMMU's small TLB. 
 */
static inline uint16_t tlb_ismall_size(void)
{
        return 16;
}

/**
 * Determine the number of entries in the IMMU's big TLB. 
 */
static inline uint16_t tlb_ibig_size(void)
{
        if (((ver_reg_t) ver_read()).impl == IMPL_ULTRASPARCIV_PLUS)
                return 512;
        else
                return 128;
}

#endif

/** Read MMU Primary Context Register.
 *
 * @return              Current value of Primary Context Register.
 */
static inline uint64_t 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(uint64_t v)
{
        asi_u64_write(ASI_DMMU, VA_PRIMARY_CONTEXT_REG, v);
        flush_pipeline();
}

/** Read MMU Secondary Context Register.
 *
 * @return              Current value of Secondary Context Register.
 */
static inline uint64_t 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(uint64_t v)
{
        asi_u64_write(ASI_DMMU, VA_SECONDARY_CONTEXT_REG, v);
        flush_pipeline();
}

#if defined (US)

/** Read IMMU TLB Data Access Register.
 *
 * @param entry         TLB Entry index.
 *
 * @return              Current value of specified IMMU TLB Data Access
 *                      Register.
 */
static inline uint64_t itlb_data_access_read(index_t entry)
{
        itlb_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, uint64_t value)
{
        itlb_data_access_addr_t reg;
        
        reg.value = 0;
        reg.tlb_entry = entry;
        asi_u64_write(ASI_ITLB_DATA_ACCESS_REG, reg.value, value);
        flush_pipeline();
}

/** Read DMMU TLB Data Access Register.
 *
 * @param entry         TLB Entry index.
 *
 * @return              Current value of specified DMMU TLB Data Access
 *                      Register.
 */
static inline uint64_t dtlb_data_access_read(index_t entry)
{
        dtlb_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, uint64_t value)
{
        dtlb_data_access_addr_t reg;
        
        reg.value = 0;
        reg.tlb_entry = entry;
        asi_u64_write(ASI_DTLB_DATA_ACCESS_REG, reg.value, value);
        membar();
}

/** Read IMMU TLB Tag Read Register.
 *
 * @param entry         TLB Entry index.
 *
 * @return              Current value of specified IMMU TLB Tag Read Register.
 */
static inline uint64_t itlb_tag_read_read(index_t entry)
{
        itlb_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 uint64_t dtlb_tag_read_read(index_t entry)
{
        dtlb_tag_read_addr_t tag;

        tag.value = 0;
        tag.tlb_entry = entry;
        return asi_u64_read(ASI_DTLB_TAG_READ_REG, tag.value);
}

#elif defined (US3)


/** Read IMMU TLB Data Access Register.
 *
 * @param tlb           TLB number (one of TLB_ISMALL or TLB_IBIG)
 * @param entry         TLB Entry index.
 *
 * @return              Current value of specified IMMU TLB Data Access
 *                      Register.
 */
static inline uint64_t itlb_data_access_read(int tlb, index_t entry)
{
        itlb_data_access_addr_t reg;
        
        reg.value = 0;
        reg.tlb_number = tlb;
        reg.local_tlb_entry = entry;
        return asi_u64_read(ASI_ITLB_DATA_ACCESS_REG, reg.value);
}

/** Write IMMU TLB Data Access Register.
 * @param tlb           TLB number (one of TLB_ISMALL or TLB_IBIG)
 * @param entry         TLB Entry index.
 * @param value         Value to be written.
 */
static inline void itlb_data_access_write(int tlb, index_t entry,
        uint64_t value)
{
        itlb_data_access_addr_t reg;
        
        reg.value = 0;
        reg.tlb_number = tlb;
        reg.local_tlb_entry = entry;
        asi_u64_write(ASI_ITLB_DATA_ACCESS_REG, reg.value, value);
        flush_pipeline();
}

/** Read DMMU TLB Data Access Register.
 *
 * @param tlb           TLB number (one of TLB_DSMALL, TLB_DBIG, TLB_DBIG) 
 * @param entry         TLB Entry index.
 *
 * @return              Current value of specified DMMU TLB Data Access
 *                      Register.
 */
static inline uint64_t dtlb_data_access_read(int tlb, index_t entry)
{
        dtlb_data_access_addr_t reg;
        
        reg.value = 0;
        reg.tlb_number = tlb;
        reg.local_tlb_entry = entry;
        return asi_u64_read(ASI_DTLB_DATA_ACCESS_REG, reg.value);
}

/** Write DMMU TLB Data Access Register.
 *
 * @param tlb           TLB number (one of TLB_DSMALL, TLB_DBIG_0, TLB_DBIG_1)  
 * @param entry         TLB Entry index.
 * @param value         Value to be written.
 */
static inline void dtlb_data_access_write(int tlb, index_t entry,
        uint64_t value)
{
        dtlb_data_access_addr_t reg;
        
        reg.value = 0;
        reg.tlb_number = tlb;
        reg.local_tlb_entry = entry;
        asi_u64_write(ASI_DTLB_DATA_ACCESS_REG, reg.value, value);
        membar();
}

/** Read IMMU TLB Tag Read Register.
 *
 * @param tlb           TLB number (one of TLB_ISMALL or TLB_IBIG) 
 * @param entry         TLB Entry index.
 *
 * @return              Current value of specified IMMU TLB Tag Read Register.
 */
static inline uint64_t itlb_tag_read_read(int tlb, index_t entry)
{
        itlb_tag_read_addr_t tag;

        tag.value = 0;
        tag.tlb_number = tlb;
        tag.local_tlb_entry = entry;
        return asi_u64_read(ASI_ITLB_TAG_READ_REG, tag.value);
}

/** Read DMMU TLB Tag Read Register.
 *
 * @param tlb           TLB number (one of TLB_DSMALL, TLB_DBIG_0, TLB_DBIG_1)
 * @param entry         TLB Entry index.
 *
 * @return              Current value of specified DMMU TLB Tag Read Register.
 */
static inline uint64_t dtlb_tag_read_read(int tlb, index_t entry)
{
        dtlb_tag_read_addr_t tag;

        tag.value = 0;
        tag.tlb_number = tlb;
        tag.local_tlb_entry = entry;
        return asi_u64_read(ASI_DTLB_TAG_READ_REG, tag.value);
}

#endif


/** Write IMMU TLB Tag Access Register.
 *
 * @param v             Value to be written.
 */
static inline void itlb_tag_access_write(uint64_t v)
{
        asi_u64_write(ASI_IMMU, VA_IMMU_TAG_ACCESS, v);
        flush_pipeline();
}

/** Read IMMU TLB Tag Access Register.
 *
 * @return              Current value of IMMU TLB Tag Access Register.
 */
static inline uint64_t 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(uint64_t v)
{
        asi_u64_write(ASI_DMMU, VA_DMMU_TAG_ACCESS, v);
        membar();
}

/** Read DMMU TLB Tag Access Register.
 *
 * @return              Current value of DMMU TLB Tag Access Register.
 */
static inline uint64_t 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(uint64_t v)
{
        asi_u64_write(ASI_ITLB_DATA_IN_REG, 0, v);
        flush_pipeline();
}

/** Write DMMU TLB Data in Register.
 *
 * @param v             Value to be written.
 */
static inline void dtlb_data_in_write(uint64_t v)
{
        asi_u64_write(ASI_DTLB_DATA_IN_REG, 0, v);
        membar();
}

/** Read ITLB Synchronous Fault Status Register.
 *
 * @return              Current content of I-SFSR register.
 */
static inline uint64_t 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(uint64_t v)
{
        asi_u64_write(ASI_IMMU, VA_IMMU_SFSR, v);
        flush_pipeline();
}

/** Read DTLB Synchronous Fault Status Register.
 *
 * @return              Current content of D-SFSR register.
 */
static inline uint64_t 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(uint64_t v)
{
        asi_u64_write(ASI_DMMU, VA_DMMU_SFSR, v);
        membar();
}

/** Read DTLB Synchronous Fault Address Register.
 *
 * @return              Current content of D-SFAR register.
 */
static inline uint64_t 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 (and entire MMU
 *                      demap on US3).
 * @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, uintptr_t 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;
        
        /* da.value is the address within the ASI */ 
        asi_u64_write(ASI_IMMU_DEMAP, da.value, 0);

        flush_pipeline();
}

/** Perform DMMU TLB Demap Operation.
 *
 * @param type          Selects between context and page demap (and entire MMU
 *                      demap on US3).
 * @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, uintptr_t 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;
        
        /* da.value is the address within the ASI */ 
        asi_u64_write(ASI_DMMU_DEMAP, da.value, 0);

        membar();
}

extern void fast_instruction_access_mmu_miss(unative_t, istate_t *);
extern void fast_data_access_mmu_miss(tlb_tag_access_reg_t, istate_t *);
extern void fast_data_access_protection(tlb_tag_access_reg_t , istate_t *);

extern void dtlb_insert_mapping(uintptr_t, uintptr_t, int, bool, bool);

extern void dump_sfsr_and_sfar(void);

#endif /* !def __ASM__ */

#endif

/** @}
 */