1 #ifndef _ASM_X86_PAGE_64_H

     2 #define _ASM_X86_PAGE_64_H

     3 

     4 #define PAGETABLE_LEVELS	4

     5 

     6 #define THREAD_ORDER	1

     7 #define THREAD_SIZE  (PAGE_SIZE << THREAD_ORDER)

     8 #define CURRENT_MASK (~(THREAD_SIZE - 1))

     9 

    10 #define EXCEPTION_STACK_ORDER 0

    11 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)

    12 

    13 #define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)

    14 #define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)

    15 

    16 #define IRQSTACK_ORDER 2

    17 #define IRQSTACKSIZE (PAGE_SIZE << IRQSTACK_ORDER)

    18 

    19 #define STACKFAULT_STACK 1

    20 #define DOUBLEFAULT_STACK 2

    21 #define NMI_STACK 3

    22 #define DEBUG_STACK 4

    23 #define MCE_STACK 5

    24 #define N_EXCEPTION_STACKS 5  /* hw limit: 7 */

    25 

    26 #define PUD_PAGE_SIZE		(_AC(1, UL) << PUD_SHIFT)

    27 #define PUD_PAGE_MASK		(~(PUD_PAGE_SIZE-1))

    28 

    29 /*

    30  * Set __PAGE_OFFSET to the most negative possible address +

    31  * PGDIR_SIZE*16 (pgd slot 272).  The gap is to allow a space for a

    32  * hypervisor to fit.  Choosing 16 slots here is arbitrary, but it's

    33  * what Xen requires.

    34  */

    35 #define __PAGE_OFFSET           _AC(0xffff880000000000, UL)

    36 

    37 #define __PHYSICAL_START	CONFIG_PHYSICAL_START

    38 #define __KERNEL_ALIGN		0x200000

    39 

    40 /*

    41  * Make sure kernel is aligned to 2MB address. Catching it at compile

    42  * time is better. Change your config file and compile the kernel

    43  * for a 2MB aligned address (CONFIG_PHYSICAL_START)

    44  */

    45 #if (CONFIG_PHYSICAL_START % __KERNEL_ALIGN) != 0

    46 #error "CONFIG_PHYSICAL_START must be a multiple of 2MB"

    47 #endif

    48 

    49 #define __START_KERNEL		(__START_KERNEL_map + __PHYSICAL_START)

    50 #define __START_KERNEL_map	_AC(0xffffffff80000000, UL)

    51 

    52 /* See Documentation/x86_64/mm.txt for a description of the memory map. */

    53 #define __PHYSICAL_MASK_SHIFT	46

    54 #define __VIRTUAL_MASK_SHIFT	48

    55 

    56 /*

    57  * Kernel image size is limited to 512 MB (see level2_kernel_pgt in

    58  * arch/x86/kernel/head_64.S), and it is mapped here:

    59  */

    60 #define KERNEL_IMAGE_SIZE	(512 * 1024 * 1024)

    61 #define KERNEL_IMAGE_START	_AC(0xffffffff80000000, UL)

    62 

    63 #ifndef __ASSEMBLY__

    64 void clear_page(void *page);

    65 void copy_page(void *to, void *from);

    66 

    67 /* duplicated to the one in bootmem.h */

    68 extern unsigned long max_pfn;

    69 extern unsigned long phys_base;

    70 

    71 extern unsigned long __phys_addr(unsigned long);

    72 #define __phys_reloc_hide(x)	(x)

    73 

    74 /*

    75  * These are used to make use of C type-checking..

    76  */

    77 typedef unsigned long	pteval_t;

    78 typedef unsigned long	pmdval_t;

    79 typedef unsigned long	pudval_t;

    80 typedef unsigned long	pgdval_t;

    81 typedef unsigned long	pgprotval_t;

    82 

    83 typedef struct page *pgtable_t;

    84 

    85 typedef struct { pteval_t pte; } pte_t;

    86 

    87 #define vmemmap ((struct page *)VMEMMAP_START)

    88 

    89 extern unsigned long init_memory_mapping(unsigned long start,

    90 					 unsigned long end);

    91 

    92 extern void initmem_init(unsigned long start_pfn, unsigned long end_pfn);

    93 extern void free_initmem(void);

    94 

    95 extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);

    96 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);

    97 

    98 #endif	/* !__ASSEMBLY__ */

    99 

   100 #ifdef CONFIG_FLATMEM

   101 #define pfn_valid(pfn)          ((pfn) < max_pfn)

   102 #endif

   103 

   104 

   105 #endif /* _ASM_X86_PAGE_64_H */