#ifndef __ASM_X86_MM_H__
#define __ASM_X86_MM_H__

#include <xen/config.h>
#include <xen/list.h>
#include <xen/spinlock.h>
#include <xen/perfc.h>
#include <xen/sched.h>

#include <asm/processor.h>
#include <asm/atomic.h>
#include <asm/desc.h>
#include <asm/flushtlb.h>
#include <asm/io.h>

#include <public/xen.h>

/*
 * Per-page-frame information.
 * 
 * Every architecture must ensure the following:
 *  1. 'struct pfn_info' contains a 'struct list_head list'.
 *  2. Provide a PFN_ORDER() macro for accessing the order of a free page.
 */
#define PFN_ORDER(_pfn) ((_pfn)->u.free.order)

struct pfn_info
{
    /* Each frame can be threaded onto a doubly-linked list. */
    struct list_head list;

    /* Reference count and various PGC_xxx flags and fields. */
    u32 count_info;

    /* Context-dependent fields follow... */
    union {

        /* Page is in use: ((count_info & PGC_count_mask) != 0). */
        struct {
            /* Owner of this page (NULL if page is anonymous). */
            struct domain *domain;
            /* Type reference count and various PGT_xxx flags and fields. */
            u32 type_info;
        } inuse;

        /* Page is on a free list: ((count_info & PGC_count_mask) == 0). */
        struct {
            /* Mask of possibly-tainted TLBs. */
            unsigned long cpu_mask;
            /* Order-size of the free chunk this page is the head of. */
            u8 order;
        } free;

    } u;

    /* Timestamp from 'TLB clock', used to reduce need for safety flushes. */
    u32 tlbflush_timestamp;
};

 /* The following page types are MUTUALLY EXCLUSIVE. */
#define PGT_none            (0<<29) /* no special uses of this page */
#define PGT_l1_page_table   (1<<29) /* using this page as an L1 page table? */
#define PGT_l2_page_table   (2<<29) /* using this page as an L2 page table? */
#define PGT_l3_page_table   (3<<29) /* using this page as an L3 page table? */
#define PGT_l4_page_table   (4<<29) /* using this page as an L4 page table? */
#define PGT_gdt_page        (5<<29) /* using this page in a GDT? */
#define PGT_ldt_page        (6<<29) /* using this page in an LDT? */
#define PGT_writable_page   (7<<29) /* has writable mappings of this page? */
#define PGT_type_mask       (7<<29) /* Bits 29-31. */
 /* Has this page been validated for use as its current type? */
#define _PGT_validated      28
#define PGT_validated       (1U<<_PGT_validated)
 /* Owning guest has pinned this page to its current type? */
#define _PGT_pinned         27
#define PGT_pinned          (1U<<_PGT_pinned)
 /* The 10 most significant bits of virt address if this is a page table. */
#define PGT_va_shift        17
#define PGT_va_mask         (((1U<<10)-1)<<PGT_va_shift)
 /* Is the back pointer still mutable (i.e. not fixed yet)? */
#define PGT_va_mutable      (((1U<<10)-1)<<PGT_va_shift)
 /* Is the back pointer unknown (e.g., p.t. is mapped at multiple VAs)? */
#define PGT_va_unknown      (((1U<<10)-2)<<PGT_va_shift)
 /* 17-bit count of uses of this frame as its current type. */
#define PGT_count_mask      ((1U<<17)-1)

 /* Cleared when the owning guest 'frees' this page. */
#define _PGC_allocated      31
#define PGC_allocated       (1U<<_PGC_allocated)
 /* 31-bit count of references to this frame. */
#define PGC_count_mask      ((1U<<31)-1)

/* We trust the slab allocator in slab.c, and our use of it. */
#define PageSlab(page)	    (1)
#define PageSetSlab(page)   ((void)0)
#define PageClearSlab(page) ((void)0)

#define IS_XEN_HEAP_FRAME(_pfn) (page_to_phys(_pfn) < xenheap_phys_end)

#define SHARE_PFN_WITH_DOMAIN(_pfn, _dom)                                   \
    do {                                                                    \
        (_pfn)->u.inuse.domain = (_dom);                                    \
        /* The incremented type count is intended to pin to 'writable'. */  \
        (_pfn)->u.inuse.type_info = PGT_writable_page | PGT_validated | 1;  \
        wmb(); /* install valid domain ptr before updating refcnt. */       \
        spin_lock(&(_dom)->page_alloc_lock);                                \
        /* _dom holds an allocation reference */                            \
        ASSERT((_pfn)->count_info == 0);                                    \
        (_pfn)->coun<style>pre { line-height: 125%; margin: 0; }
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</pre></div>
</code></pre></td></tr></table>
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    \
        if (ptwr_info[cpu].ptinfo[PTWR_PT_INACTIVE].l1va)                   \
            ptwr_flush(PTWR_PT_INACTIVE);                                   \
} while ( 0 )

#define cleanup_writable_pagetable(_d, _w)                                \
    do {                                                                  \
        if ( unlikely(VM_ASSIST((_d), VMASST_TYPE_writable_pagetables)) ) \
        __cleanup_writable_pagetable(_w);                                 \
    } while ( 0 )

#ifndef NDEBUG
void audit_domain(struct domain *d);
void audit_domains(void);
#else
#define audit_domain(_d) ((void)0)
#define audit_domains()  ((void)0)
#endif

#endif /* __ASM_X86_MM_H__ */