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/*

 * Copyright (C) 2001-2004 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 __ia32_PAGE_H__

#define __ia32_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.

 * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.

 */

#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 *)((((pte_t *)(ptl0))[(i)].frame_address)<<12))

#define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)

#define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)

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

#define SET_PTL0_ADDRESS_ARCH(ptl0)     (write_cr3((__address) (ptl0)))

#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a)   (((pte_t *)(ptl0))[(i)].frame_address = (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)].frame_address = (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(p)           (*((__u32 *) (p)) != 0)

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

#define PTE_GET_FRAME_ARCH(p)           ((p)->frame_address<<FRAME_WIDTH)

#ifndef __ASM__

#include <mm/page.h>

#include <arch/types.h>

#include <arch/mm/frame.h>

#include <typedefs.h>

/* Page fault error codes. */

/** When bit on this position is 0, the page fault was caused by a not-present page. */

#define PFERR_CODE_P        (1<<0)

/** When bit on this position is 1, the page fault was caused by a write. */

#define PFERR_CODE_RW       (1<<1)

/** When bit on this position is 1, the page fault was caused in user mode. */

#define PFERR_CODE_US       (1<<2)

/** When bit on this position is 1, a reserved bit was set in page directory. */

#define PFERR_CODE_RSVD     (1<<3)  

/** Page Table Entry. */

struct page_specifier {

    unsigned present : 1;

    unsigned writeable : 1;

    unsigned uaccessible : 1;

    unsigned page_write_through : 1;

    unsigned page_cache_disable : 1;

    unsigned accessed : 1;

    unsigned dirty : 1;

    unsigned pat : 1;

    unsigned global : 1;

    unsigned soft_valid : 1;    /**< Valid content even if the present bit is not set. */

    unsigned avl : 2;

    unsigned frame_address : 20;

} __attribute__ ((packed));

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

{

    pte_t *p = &pt[i];

    return (

        (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT |

        (!p->present)<<PAGE_PRESENT_SHIFT |

        p->uaccessible<<PAGE_USER_SHIFT |

        1<<PAGE_READ_SHIFT |

        p->writeable<<PAGE_WRITE_SHIFT |

        1<<PAGE_EXEC_SHIFT |

        p->global<<PAGE_GLOBAL_SHIFT

    );

}

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

{

    pte_t *p = &pt[i];

    p->page_cache_disable = !(flags & PAGE_CACHEABLE);

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

    p->uaccessible = (flags & PAGE_USER) != 0;

    p->writeable = (flags & PAGE_WRITE) != 0;

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

    /*

     * Ensure that there is at least one bit set even if the present bit is cleared.

     */

    p->soft_valid = true;

}

extern void page_arch_init(void);

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

#endif /* __ASM__ */

#endif /* KERNEL */

#endif