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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)

#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)
    );
}

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->valid = 1;
}

extern void page_arch_init(void);

#endif /* __ASM__ */

#endif /* KERNEL */

#endif