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/*

 * Copyright (c) 2005 - 2006 Jakub Jermar

 * Copyright (c) 2006 Jakub Vana

 * 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 ia64mm 

 * @{

 */

/** @file

 */

#ifndef KERN_ia64_PAGE_H_

#define KERN_ia64_PAGE_H_

#include <arch/mm/frame.h>

#define PAGE_SIZE   FRAME_SIZE

#define PAGE_WIDTH  FRAME_WIDTH

#define PAGE_COLOR_BITS 0           /* dummy */

#ifdef KERNEL

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

#define KERNEL_PAGE_WIDTH       28  /* 256M */

#define PPN_SHIFT           12

#define VRN_SHIFT           61

#define VRN_MASK            (7LL << VRN_SHIFT)

#define VA2VRN(va)          ((va)>>VRN_SHIFT)

#ifdef __ASM__

#define VRN_KERNEL          7

#else

#define VRN_KERNEL          7LL

#endif

#define REGION_REGISTERS        8

#define KA2PA(x)    ((uintptr_t) (x-(VRN_KERNEL<<VRN_SHIFT)))

#define PA2KA(x)    ((uintptr_t) (x+(VRN_KERNEL<<VRN_SHIFT)))

#define VHPT_WIDTH          20  /* 1M */

#define VHPT_SIZE           (1 << VHPT_WIDTH)

#define PTA_BASE_SHIFT          15

/** Memory Attributes. */

#define MA_WRITEBACK    0x0

#define MA_UNCACHEABLE  0x4

/** Privilege Levels. Only the most and the least privileged ones are ever used. */

#define PL_KERNEL   0x0

#define PL_USER     0x3

/* Access Rigths. Only certain combinations are used by the kernel. */

#define AR_READ     0x0

#define AR_EXECUTE  0x1

#define AR_WRITE    0x2

#ifndef __ASM__

#include <arch/mm/as.h>

#include <arch/mm/frame.h>

#include <arch/interrupt.h>

#include <arch/barrier.h>

#include <arch/mm/asid.h>

#include <arch/types.h>

#include <debug.h>

struct vhpt_tag_info {

    unsigned long long tag : 63;

    unsigned ti : 1;

} __attribute__ ((packed));

union vhpt_tag {

    struct vhpt_tag_info tag_info;

    unsigned tag_word;

};

struct vhpt_entry_present {

    /* Word 0 */

    unsigned p : 1;

    unsigned : 1;

    unsigned ma : 3;

    unsigned a : 1;

    unsigned d : 1;

    unsigned pl : 2;

    unsigned ar : 3;

    unsigned long long ppn : 38;

    unsigned : 2;

    unsigned ed : 1;

    unsigned ig1 : 11;

    /* Word 1 */

    unsigned : 2;

    unsigned ps : 6;

    unsigned key : 24;

    unsigned : 32;

    /* Word 2 */

    union vhpt_tag tag;

    /* Word 3 */                                                   

    uint64_t ig3 : 64;

} __attribute__ ((packed));

struct vhpt_entry_not_present {

    /* Word 0 */

    unsigned p : 1;

    unsigned long long ig0 : 52;

    unsigned ig1 : 11;

    /* Word 1 */

    unsigned : 2;

    unsigned ps : 6;

    unsigned long long ig2 : 56;

    /* Word 2 */

    union vhpt_tag tag;

    /* Word 3 */                                                   

    uint64_t ig3 : 64;

} __attribute__ ((packed));

typedef union vhpt_entry {

    struct vhpt_entry_present present;

    struct vhpt_entry_not_present not_present;

    uint64_t word[4];

} vhpt_entry_t;

struct region_register_map {

    unsigned ve : 1;

    unsigned : 1;

    unsigned ps : 6;

    unsigned rid : 24;

    unsigned : 32;

} __attribute__ ((packed));

typedef union region_register {

    struct region_register_map map;

    unsigned long long word;

} region_register;

struct pta_register_map {

    unsigned ve : 1;

    unsigned : 1;

    unsigned size : 6;

    unsigned vf : 1;

    unsigned : 6;

    unsigned long long base : 49;

} __attribute__ ((packed));

typedef union pta_register {

    struct pta_register_map map;

    uint64_t word;

} pta_register;

/** Return Translation Hashed Entry Address.

 *

 * VRN bits are used to read RID (ASID) from one

 * of the eight region registers registers.

 *

 * @param va Virtual address including VRN bits.

 *

 * @return Address of the head of VHPT collision chain.

 */

static inline uint64_t thash(uint64_t va)

{

    uint64_t ret;

    asm volatile ("thash %0 = %1\n" : "=r" (ret) : "r" (va));

    return ret;

}

/** Return Translation Hashed Entry Tag.

 *

 * VRN bits are used to read RID (ASID) from one

 * of the eight region registers.

 *

 * @param va Virtual address including VRN bits.

 *

 * @return The unique tag for VPN and RID in the collision chain returned by thash().

 */

static inline uint64_t ttag(uint64_t va)

{

    uint64_t ret;

    asm volatile ("ttag %0 = %1\n" : "=r" (ret) : "r" (va));

    return ret;

}

/** Read Region Register.

 *

 * @param i Region register index.

 *

 * @return Current contents of rr[i].

 */

static inline uint64_t rr_read(index_t i)

{

    uint64_t ret;

    ASSERT(i < REGION_REGISTERS);

    asm volatile ("mov %0 = rr[%1]\n" : "=r" (ret) : "r" (i << VRN_SHIFT));

    return ret;

}

/** Write Region Register.

 *

 * @param i Region register index.

 * @param v Value to be written to rr[i].

 */

static inline void rr_write(index_t i, uint64_t v)

{

    ASSERT(i < REGION_REGISTERS);

    asm volatile (

        "mov rr[%0] = %1\n"

        :

        : "r" (i << VRN_SHIFT), "r" (v)

    );

}

/** Read Page Table Register.

 *

 * @return Current value stored in PTA.

 */

static inline uint64_t pta_read(void)

{

    uint64_t ret;

    asm volatile ("mov %0 = cr.pta\n" : "=r" (ret));

    return ret;

}

/** Write Page Table Register.

 *

 * @param v New value to be stored in PTA.

 */

static inline void pta_write(uint64_t v)

{

    asm volatile ("mov cr.pta = %0\n" : : "r" (v));

}

extern void page_arch_init(void);

extern vhpt_entry_t *vhpt_hash(uintptr_t page, asid_t asid);

extern bool vhpt_compare(uintptr_t page, asid_t asid, vhpt_entry_t *v);

extern void vhpt_set_record(vhpt_entry_t *v, uintptr_t page, asid_t asid, uintptr_t frame, int flags);

#endif /* __ASM__ */

#endif /* KERNEL */

#endif

/** @}

 */