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/*

 * Copyright (c) 2006 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.

 */

/** @addtogroup ia32xen_mm 

 * @{

 */

/** @file

 */

#ifndef KERN_ia32xen_PAGE_H_

#define KERN_ia32xen_PAGE_H_

#include <arch/mm/frame.h>

#define PAGE_WIDTH  FRAME_WIDTH

#define PAGE_SIZE   FRAME_SIZE

#define PAGE_COLOR_BITS 0           /* dummy */

#ifdef KERNEL

#ifndef __ASM__

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

#   define PA2KA(x) (((uintptr_t) (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 *) MA2PA((((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)     ((uintptr_t) MA2PA((((pte_t *) (ptl3))[(i)].frame_address) << 12))

#define SET_PTL0_ADDRESS_ARCH(ptl0) { \

    mmuext_op_t mmu_ext; \

    \

    mmu_ext.cmd = MMUEXT_NEW_BASEPTR; \

    mmu_ext.mfn = ADDR2PFN(PA2MA(ptl0)); \

    ASSERT(xen_mmuext_op(&mmu_ext, 1, NULL, DOMID_SELF) == 0); \

}

#define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) { \

    mmuext_op_t mmu_ext; \

    \

    mmu_ext.cmd = MMUEXT_PIN_L1_TABLE; \

    mmu_ext.mfn = ADDR2PFN(PA2MA(a)); \

    ASSERT(xen_mmuext_op(&mmu_ext, 1, NULL, DOMID_SELF) == 0); \

    \

    mmu_update_t update; \

    \

    update.ptr = PA2MA(KA2PA(&((pte_t *) (ptl0))[(i)])); \

    update.val = PA2MA(a); \

    ASSERT(xen_mmu_update(&update, 1, NULL, DOMID_SELF) == 0); \

}

#define SET_PTL2_ADDRESS_ARCH(ptl1, i, a)

#define SET_PTL3_ADDRESS_ARCH(ptl2, i, a)

#define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) { \

    mmu_update_t update; \

    \

    update.ptr = PA2MA(KA2PA(&((pte_t *) (ptl3))[(i)])); \

    update.val = PA2MA(a); \

    ASSERT(xen_mmu_update(&update, 1, NULL, DOMID_SELF) == 0); \

}

#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)           (*((uint32_t *) (p)) != 0)

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

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

#define PTE_WRITABLE_ARCH(p)            ((p)->writeable != 0)

#define PTE_EXECUTABLE_ARCH(p)          1

#ifndef __ASM__

#include <mm/page.h>

#include <arch/types.h>

#include <arch/mm/frame.h>

#include <typedefs.h>

#include <arch/hypercall.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));

typedef struct {

    uint64_t ptr;      /**< Machine address of PTE */

    union {            /**< New contents of PTE */

        uint64_t val;

        pte_t pte;

    };

} mmu_update_t;

typedef struct {

    unsigned int cmd;

    union {

        unsigned long mfn;

        unsigned long linear_addr;

    };

    union {

        unsigned int nr_ents;

        void *vcpumask;

    };

} mmuext_op_t;

static inline int xen_update_va_mapping(const void *va, const pte_t pte, const unsigned int flags)

{

    return hypercall4(XEN_UPDATE_VA_MAPPING, va, pte, 0, flags);

}

static inline int xen_mmu_update(const mmu_update_t *req, const unsigned int count, unsigned int *success_count, domid_t domid)

{

    return hypercall4(XEN_MMU_UPDATE, req, count, success_count, domid);

}

static inline int xen_mmuext_op(const mmuext_op_t *op, const unsigned int count, unsigned int *success_count, domid_t domid)

{

    return hypercall4(XEN_MMUEXT_OP, op, count, success_count, domid);

}

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;

    mmu_update_t update;

    update.ptr = PA2MA(KA2PA(&(pt[i])));

    update.pte = p;

    xen_mmu_update(&update, 1, NULL, DOMID_SELF);

}

extern void page_arch_init(void);

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

#endif /* __ASM__ */

#endif /* KERNEL */

#endif

/** @}

 */