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#ifndef _X86_64_PAGE_H

#define _X86_64_PAGE_H

#include <linux/stringify.h>

/* 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_MASK         0x0000ffffffffffffUL

#define PHYSICAL_PAGE_MASK      0x0000fffffffff000UL

#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))

#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)

#define LARGE_PFN       (LARGE_PAGE_SIZE / PAGE_SIZE)

#define KERNEL_TEXT_SIZE  (40UL*1024*1024)

#define KERNEL_TEXT_START 0xffffffff80000000UL 

/* Changing the next two defines should be enough to increase the kernel stack */

/* We still hope 8K is enough, but ... */

/* Currently it is actually ~6k. This would change when task_struct moves into

   an own slab. */

#define THREAD_ORDER    1

#define THREAD_SIZE    (2*PAGE_SIZE)

#define INIT_TASK_SIZE THREAD_SIZE

#define CURRENT_MASK (~(THREAD_SIZE-1))

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

void clear_page(void *);

void copy_page(void *, void *);

#define clear_user_page(page, vaddr)    clear_page(page)

#define copy_user_page(to, from, vaddr) copy_page(to, from)

/*

 * 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 pgd; } pgd_t;

typedef struct { unsigned long pml4; } pml4_t;

#define PTE_MASK        PHYSICAL_PAGE_MASK

typedef struct { unsigned long pgprot; } pgprot_t;

#define pte_val(x)      ((x).pte)

#define pmd_val(x)      ((x).pmd)

#define pgd_val(x)      ((x).pgd)

#define pml4_val(x)     ((x).pml4)

#define pgprot_val(x)   ((x).pgprot)

#define __pte(x) ((pte_t) { (x) } )

#define __pmd(x) ((pmd_t) { (x) } )

#define __pgd(x) ((pgd_t) { (x) } )

#define __pml4(x) ((pml4_t) { (x) } )

#define __pgprot(x)     ((pgprot_t) { (x) } )

extern unsigned long vm_stack_flags, vm_stack_flags32;

extern unsigned long vm_data_default_flags, vm_data_default_flags32;

extern unsigned long vm_force_exec32;

#endif /* !__ASSEMBLY__ */

/* 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 layout. */

#define __START_KERNEL          0xffffffff80100000

#define __START_KERNEL_map      0xffffffff80000000

#define __PAGE_OFFSET           0x0000010000000000

#ifndef __ASSEMBLY__

#include <linux/config.h>

/*

 * Tell the user there is some problem.  The exception handler decodes this frame.

 */

struct bug_frame {

       unsigned char ud2[2];

       char *filename;    /* should use 32bit offset instead, but the assembler doesn't like it */

       unsigned short line;

} __attribute__((packed));

#define BUG() asm volatile("ud2 ; .quad %P1 ; .short %P0" :: "i"(__LINE__), \

                "i" (__stringify(KBUILD_BASENAME)))

#define HEADER_BUG() asm volatile("ud2 ; .quad %P1 ; .short %P0" :: "i"(__LINE__), \

                "i" (__stringify(__FILE__)))

#define PAGE_BUG(page) BUG()

/* Pure 2^n version of get_order */

extern __inline__ int get_order(unsigned long size)

{

        int order;

        size = (size-1) >> (PAGE_SHIFT-1);

        order = -1;

        do {

                size >>= 1;

                order++;

        } while (size);

        return order;

}

#endif /* __ASSEMBLY__ */

#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 use for C visible symbols, but only for them.

   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)); \

         v - __START_KERNEL_map; })

#define __pa_maybe_symbol(x)            \

        ({unsigned long v;  \

          asm("" : "=r" (v) : "0" (x)); \

          __pa(v); })

#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))

#ifndef CONFIG_DISCONTIGMEM

#define virt_to_page(kaddr)     (mem_map + (__pa(kaddr) >> PAGE_SHIFT))

#define pfn_to_page(pfn)        (mem_map + (pfn)) 

#define page_to_pfn(page)   ((page) - mem_map)

#define page_to_phys(page)      (((page) - mem_map) << PAGE_SHIFT)

#define VALID_PAGE(page)        (((page) - mem_map) < max_mapnr)

#endif

#define phys_to_pfn(phys)       ((phys) >> PAGE_SHIFT)

#define __VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \

                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define __VM_STACK_FLAGS        (VM_GROWSDOWN | VM_READ | VM_WRITE | VM_EXEC | \

                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define VM_DATA_DEFAULT_FLAGS \

        ((current->thread.flags & THREAD_IA32) ? vm_data_default_flags32 : \

          vm_data_default_flags)

#define VM_STACK_FLAGS  vm_stack_flags

#endif /* __KERNEL__ */

#endif /* _X86_64_PAGE_H */