--- /dev/null
+#ifndef _X86_64_PAGE_H
+#define _X86_64_PAGE_H
+
+#include <linux/config.h>
+/* #include <linux/string.h> */
+#ifndef __ASSEMBLY__
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <asm/bug.h>
+#include <xen/features.h>
+#endif
+#include <xen/interface/xen.h>
+#include <xen/foreign_page.h>
+
+#define arch_free_page(_page,_order) \
+({ int foreign = PageForeign(_page); \
+ if (foreign) \
+ (PageForeignDestructor(_page))(_page); \
+ foreign; \
+})
+#define HAVE_ARCH_FREE_PAGE
+
+#ifdef CONFIG_XEN_SCRUB_PAGES
+#define scrub_pages(_p,_n) memset((void *)(_p), 0, (_n) << PAGE_SHIFT)
+#else
+#define scrub_pages(_p,_n) ((void)0)
+#endif
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT 12
+#ifdef __ASSEMBLY__
+#define PAGE_SIZE (0x1 << PAGE_SHIFT)
+#else
+#define PAGE_SIZE (1UL << PAGE_SHIFT)
+#endif
+#define PAGE_MASK (~(PAGE_SIZE-1))
+#define PHYSICAL_PAGE_MASK (~(PAGE_SIZE-1) & __PHYSICAL_MASK)
+
+#define THREAD_ORDER 1
+#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
+#define CURRENT_MASK (~(THREAD_SIZE-1))
+
+#define EXCEPTION_STACK_ORDER 0
+#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
+
+#define DEBUG_STACK_ORDER EXCEPTION_STACK_ORDER
+#define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
+
+#define IRQSTACK_ORDER 2
+#define IRQSTACKSIZE (PAGE_SIZE << IRQSTACK_ORDER)
+
+#define STACKFAULT_STACK 1
+#define DOUBLEFAULT_STACK 2
+#define NMI_STACK 3
+#define DEBUG_STACK 4
+#define MCE_STACK 5
+#define N_EXCEPTION_STACKS 5 /* hw limit: 7 */
+
+#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
+#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
+
+#define HPAGE_SHIFT PMD_SHIFT
+#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
+#define HPAGE_MASK (~(HPAGE_SIZE - 1))
+#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
+
+#ifdef __KERNEL__
+#ifndef __ASSEMBLY__
+
+extern unsigned long end_pfn;
+
+void clear_page(void *);
+void copy_page(void *, void *);
+
+#define clear_user_page(page, vaddr, pg) clear_page(page)
+#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
+
+#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
+#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
+
+/**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/
+#define INVALID_P2M_ENTRY (~0UL)
+#define FOREIGN_FRAME_BIT (1UL<<63)
+#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT)
+
+extern unsigned long *phys_to_machine_mapping;
+
+#undef machine_to_phys_mapping
+extern unsigned long *machine_to_phys_mapping;
+extern unsigned int machine_to_phys_order;
+
+static inline unsigned long pfn_to_mfn(unsigned long pfn)
+{
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return pfn;
+ return phys_to_machine_mapping[(unsigned int)(pfn)] &
+ ~FOREIGN_FRAME_BIT;
+}
+
+static inline int phys_to_machine_mapping_valid(unsigned long pfn)
+{
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return 1;
+ return (phys_to_machine_mapping[pfn] != INVALID_P2M_ENTRY);
+}
+
+static inline unsigned long mfn_to_pfn(unsigned long mfn)
+{
+ unsigned long pfn;
+
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return mfn;
+
+ if (unlikely((mfn >> machine_to_phys_order) != 0))
+ return end_pfn;
+
+ /* The array access can fail (e.g., device space beyond end of RAM). */
+ asm (
+ "1: movq %1,%0\n"
+ "2:\n"
+ ".section .fixup,\"ax\"\n"
+ "3: movq %2,%0\n"
+ " jmp 2b\n"
+ ".previous\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 8\n"
+ " .quad 1b,3b\n"
+ ".previous"
+ : "=r" (pfn)
+ : "m" (machine_to_phys_mapping[mfn]), "m" (end_pfn) );
+
+ return pfn;
+}
+
+/*
+ * We detect special mappings in one of two ways:
+ * 1. If the MFN is an I/O page then Xen will set the m2p entry
+ * to be outside our maximum possible pseudophys range.
+ * 2. If the MFN belongs to a different domain then we will certainly
+ * not have MFN in our p2m table. Conversely, if the page is ours,
+ * then we'll have p2m(m2p(MFN))==MFN.
+ * If we detect a special mapping then it doesn't have a 'struct page'.
+ * We force !pfn_valid() by returning an out-of-range pointer.
+ *
+ * NB. These checks require that, for any MFN that is not in our reservation,
+ * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
+ * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
+ * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
+ *
+ * NB2. When deliberately mapping foreign pages into the p2m table, you *must*
+ * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
+ * require. In all the cases we care about, the FOREIGN_FRAME bit is
+ * masked (e.g., pfn_to_mfn()) so behaviour there is correct.
+ */
+static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
+{
+ unsigned long pfn = mfn_to_pfn(mfn);
+ if ((pfn < end_pfn)
+ && !xen_feature(XENFEAT_auto_translated_physmap)
+ && (phys_to_machine_mapping[pfn] != mfn))
+ return end_pfn; /* force !pfn_valid() */
+ return pfn;
+}
+
+
+static inline void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
+{
+ if (xen_feature(XENFEAT_auto_translated_physmap)) {
+ BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
+ return;
+ }
+ phys_to_machine_mapping[pfn] = mfn;
+}
+
+/* Definitions for machine and pseudophysical addresses. */
+typedef unsigned long paddr_t;
+typedef unsigned long maddr_t;
+
+static inline maddr_t phys_to_machine(paddr_t phys)
+{
+ maddr_t machine = pfn_to_mfn(phys >> PAGE_SHIFT);
+ machine = (machine << PAGE_SHIFT) | (phys & ~PAGE_MASK);
+ return machine;
+}
+
+static inline paddr_t machine_to_phys(maddr_t machine)
+{
+ paddr_t phys = mfn_to_pfn(machine >> PAGE_SHIFT);
+ phys = (phys << PAGE_SHIFT) | (machine & ~PAGE_MASK);
+ return phys;
+}
+
+/*
+ * These are used to make use of C type-checking..
+ */
+typedef struct { unsigned long pte; } pte_t;
+typedef struct { unsigned long pmd; } pmd_t;
+typedef struct { unsigned long pud; } pud_t;
+typedef struct { unsigned long pgd; } pgd_t;
+#define PTE_MASK PHYSICAL_PAGE_MASK
+
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+#define pte_val(x) (((x).pte & 1) ? machine_to_phys((x).pte) : \
+ (x).pte)
+#define pte_val_ma(x) ((x).pte)
+
+static inline unsigned long pmd_val(pmd_t x)
+{
+ unsigned long ret = x.pmd;
+ if (ret) ret = machine_to_phys(ret);
+ return ret;
+}
+
+static inline unsigned long pud_val(pud_t x)
+{
+ unsigned long ret = x.pud;
+ if (ret) ret = machine_to_phys(ret);
+ return ret;
+}
+
+static inline unsigned long pgd_val(pgd_t x)
+{
+ unsigned long ret = x.pgd;
+ if (ret) ret = machine_to_phys(ret);
+ return ret;
+}
+
+#define pgprot_val(x) ((x).pgprot)
+
+#define __pte_ma(x) ((pte_t) { (x) } )
+
+static inline pte_t __pte(unsigned long x)
+{
+ if (x & 1) x = phys_to_machine(x);
+ return ((pte_t) { (x) });
+}
+
+static inline pmd_t __pmd(unsigned long x)
+{
+ if ((x & 1)) x = phys_to_machine(x);
+ return ((pmd_t) { (x) });
+}
+
+static inline pud_t __pud(unsigned long x)
+{
+ if ((x & 1)) x = phys_to_machine(x);
+ return ((pud_t) { (x) });
+}
+
+static inline pgd_t __pgd(unsigned long x)
+{
+ if ((x & 1)) x = phys_to_machine(x);
+ return ((pgd_t) { (x) });
+}
+
+#define __pgprot(x) ((pgprot_t) { (x) } )
+
+#define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
+#define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
+#define __START_KERNEL_map 0xffffffff80000000UL
+#define __PAGE_OFFSET 0xffff880000000000UL
+
+#else
+#define __PHYSICAL_START CONFIG_PHYSICAL_START
+#define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
+#define __START_KERNEL_map 0xffffffff80000000
+#define __PAGE_OFFSET 0xffff880000000000
+#endif /* !__ASSEMBLY__ */
+
+#ifdef CONFIG_XEN_COMPAT_030002
+#undef LOAD_OFFSET
+#define LOAD_OFFSET 0
+#endif /* CONFIG_XEN_COMPAT_030002 */
+
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
+
+/* See Documentation/x86_64/mm.txt for a description of the memory map. */
+#define __PHYSICAL_MASK_SHIFT 46
+#define __PHYSICAL_MASK ((1UL << __PHYSICAL_MASK_SHIFT) - 1)
+#define __VIRTUAL_MASK_SHIFT 48
+#define __VIRTUAL_MASK ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
+
+#define KERNEL_TEXT_SIZE (40UL*1024*1024)
+#define KERNEL_TEXT_START 0xffffffff80000000UL
+
+#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
+
+/* Note: __pa(&symbol_visible_to_c) should be always replaced with __pa_symbol.
+ Otherwise you risk miscompilation. */
+#define __pa(x) (((unsigned long)(x)>=__START_KERNEL_map)?(unsigned long)(x) - (unsigned long)__START_KERNEL_map:(unsigned long)(x) - PAGE_OFFSET)
+/* __pa_symbol should be used for C visible symbols.
+ This seems to be the official gcc blessed way to do such arithmetic. */
+#define __pa_symbol(x) \
+ ({unsigned long v; \
+ asm("" : "=r" (v) : "0" (x)); \
+ __pa(v); })
+
+#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
+#define __boot_va(x) __va(x)
+#define __boot_pa(x) __pa(x)
+#ifdef CONFIG_FLATMEM
+#define pfn_valid(pfn) ((pfn) < end_pfn)
+#endif
+
+#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
+#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
+
+/* VIRT <-> MACHINE conversion */
+#define virt_to_machine(v) (phys_to_machine(__pa(v)))
+#define virt_to_mfn(v) (pfn_to_mfn(__pa(v) >> PAGE_SHIFT))
+#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
+
+#define VM_DATA_DEFAULT_FLAGS \
+ (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
+ VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#define __HAVE_ARCH_GATE_AREA 1
+
+#ifndef __ASSEMBLY__
+extern int devmem_is_allowed(unsigned long pagenr);
+#endif
+
+#endif /* __KERNEL__ */
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/page.h>
+
+#endif /* _X86_64_PAGE_H */
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