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/*

 * Copyright (C) 2005 Martin Decky

 * 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 __ppc32_PAGE_H__

#define __ppc32_PAGE_H__

#include <arch/mm/frame.h>

#define PAGE_WIDTH  FRAME_WIDTH

#define PAGE_SIZE   FRAME_SIZE

#ifdef KERNEL

#ifndef __ASM__

#   define KA2PA(x) (((__address) (x)) - 0x80000000)

#   define PA2KA(x) (((__address) (x)) + 0x80000000)

#else

#   define KA2PA(x) ((x) - 0x80000000)

#   define PA2KA(x) ((x) + 0x80000000)

#endif

/*

 * Implementation of generic 4-level page table interface,

 * the hardware Page Hash Table is used as cache.

 *

 * Page table layout:

 * - 32-bit virtual addressess

 * - Offset is 12 bits => pages are 4K long

 * - PTL0 has 1024 entries (10 bits)

 * - PTL1 is not used

 * - PTL2 is not used

 * - PLT3 has 1024 entries (10 bits)

 */

#define PTL0_ENTRIES_ARCH   1024

#define PTL1_ENTRIES_ARCH   0

#define PTL2_ENTRIES_ARCH   0

#define PTL3_ENTRIES_ARCH   1024

#define PTL0_INDEX_ARCH(vaddr)  (((vaddr) >> 22) & 0x3ff)

#define PTL1_INDEX_ARCH(vaddr)  0

#define PTL2_INDEX_ARCH(vaddr)  0

#define PTL3_INDEX_ARCH(vaddr)  (((vaddr) >> 12) & 0x3ff)

#define GET_PTL1_ADDRESS_ARCH(ptl0, i)      (((pte_t *) (ptl0))[(i)].pfn << 12)

#define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)

#define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)

#define GET_FRAME_ADDRESS_ARCH(ptl3, i)     (((pte_t *) (ptl3))[(i)].pfn << 12)

#define SET_PTL0_ADDRESS_ARCH(ptl0)

#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *) (ptl0))[(i)].pfn = (a) >> 12)

#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)

#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)

#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a)  (((pte_t *) (ptl3))[(i)].pfn = (a) >> 12)

#define GET_PTL1_FLAGS_ARCH(ptl0, i)        get_pt_flags((pte_t *) (ptl0), (index_t) (i))

#define GET_PTL2_FLAGS_ARCH(ptl1, i)        PAGE_PRESENT

#define GET_PTL3_FLAGS_ARCH(ptl2, i)        PAGE_PRESENT

#define GET_FRAME_FLAGS_ARCH(ptl3, i)       get_pt_flags((pte_t *) (ptl3), (index_t) (i))

#define SET_PTL1_FLAGS_ARCH(ptl0, i, x)     set_pt_flags((pte_t *) (ptl0), (index_t) (i), (x))

#define SET_PTL2_FLAGS_ARCH(ptl1, i, x)

#define SET_PTL3_FLAGS_ARCH(ptl2, i, x)

#define SET_FRAME_FLAGS_ARCH(ptl3, i, x)    set_pt_flags((pte_t *) (ptl3), (index_t) (i), (x))

#define PTE_VALID_ARCH(pte)         (*((__u32 *) (pte)) != 0)

#define PTE_PRESENT_ARCH(pte)           ((pte)->p != 0)

#define PTE_GET_FRAME_ARCH(pte)         ((pte)->pfn << 12)

#define PTE_WRITABLE_ARCH(pte)          1

#define PTE_EXECUTABLE_ARCH(pte)        1

#ifndef __ASM__

#include <mm/page.h>

#include <arch/mm/frame.h>

#include <arch/types.h>

static inline int get_pt_flags(pte_t *pt, index_t i)

{

    pte_t *p = &pt[i];

    return (

        (1 << PAGE_CACHEABLE_SHIFT) |

        ((!p->p) << PAGE_PRESENT_SHIFT) |

        (1 << PAGE_USER_SHIFT) |

        (1 << PAGE_READ_SHIFT) |

        (1 << PAGE_WRITE_SHIFT) |

        (1 << PAGE_EXEC_SHIFT) |

        (p->g << PAGE_GLOBAL_SHIFT)

    );

}

static inline void set_pt_flags(pte_t *pt, index_t i, int flags)

{

    pte_t *p = &pt[i];

    p->p = !(flags & PAGE_NOT_PRESENT);

    p->g = (flags & PAGE_GLOBAL) != 0;

    p->valid = 1;

}

extern void page_arch_init(void);

#define PHT_BITS    16

#define PHT_ORDER   4

typedef struct {

    unsigned v : 1;          /**< Valid */

    unsigned vsid : 24;      /**< Virtual Segment ID */

    unsigned h : 1;          /**< Primary/secondary hash */

    unsigned api : 6;        /**< Abbreviated Page Index */

    unsigned rpn : 20;       /**< Real Page Number */

    unsigned reserved0 : 3;

    unsigned r : 1;          /**< Reference */

    unsigned c : 1;          /**< Change */

    unsigned wimg : 4;       /**< Access control */

    unsigned reserved1 : 1;

    unsigned pp : 2;         /**< Page protection */

} phte_t;

extern void pht_refill(int n, istate_t *istate);

extern void pht_init(void);

#endif /* __ASM__ */

#endif /* KERNEL */

#endif