page_64.h 2.9 KB
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#ifndef ASM_X86__PAGE_64_H
#define ASM_X86__PAGE_64_H
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#define PAGETABLE_LEVELS	4

#define THREAD_ORDER	1
#define THREAD_SIZE  (PAGE_SIZE << THREAD_ORDER)
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#define CURRENT_MASK (~(THREAD_SIZE - 1))
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#define EXCEPTION_STACK_ORDER 0
#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)

#define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
#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 */

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#define PUD_PAGE_SIZE		(_AC(1, UL) << PUD_SHIFT)
#define PUD_PAGE_MASK		(~(PUD_PAGE_SIZE-1))

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/*
 * Set __PAGE_OFFSET to the most negative possible address +
 * PGDIR_SIZE*16 (pgd slot 272).  The gap is to allow a space for a
 * hypervisor to fit.  Choosing 16 slots here is arbitrary, but it's
 * what Xen requires.
 */
#define __PAGE_OFFSET           _AC(0xffff880000000000, UL)
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#define __PHYSICAL_START	CONFIG_PHYSICAL_START
#define __KERNEL_ALIGN		0x200000
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/*
 * Make sure kernel is aligned to 2MB address. Catching it at compile
 * time is better. Change your config file and compile the kernel
 * for a 2MB aligned address (CONFIG_PHYSICAL_START)
 */
#if (CONFIG_PHYSICAL_START % __KERNEL_ALIGN) != 0
#error "CONFIG_PHYSICAL_START must be a multiple of 2MB"
#endif

#define __START_KERNEL		(__START_KERNEL_map + __PHYSICAL_START)
#define __START_KERNEL_map	_AC(0xffffffff80000000, UL)

/* See Documentation/x86_64/mm.txt for a description of the memory map. */
#define __PHYSICAL_MASK_SHIFT	46
#define __VIRTUAL_MASK_SHIFT	48

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/*
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 * Kernel image size is limited to 512 MB (see level2_kernel_pgt in
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 * arch/x86/kernel/head_64.S), and it is mapped here:
 */
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#define KERNEL_IMAGE_SIZE	(512 * 1024 * 1024)
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#define KERNEL_IMAGE_START	_AC(0xffffffff80000000, UL)
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#ifndef __ASSEMBLY__
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void clear_page(void *page);
void copy_page(void *to, void *from);

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/* duplicated to the one in bootmem.h */
extern unsigned long max_pfn;
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extern unsigned long phys_base;

extern unsigned long __phys_addr(unsigned long);
#define __phys_reloc_hide(x)	(x)

/*
 * These are used to make use of C type-checking..
 */
typedef unsigned long	pteval_t;
typedef unsigned long	pmdval_t;
typedef unsigned long	pudval_t;
typedef unsigned long	pgdval_t;
typedef unsigned long	pgprotval_t;

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typedef struct page *pgtable_t;

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typedef struct { pteval_t pte; } pte_t;
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#define vmemmap ((struct page *)VMEMMAP_START)
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extern unsigned long init_memory_mapping(unsigned long start,
					 unsigned long end);

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extern void initmem_init(unsigned long start_pfn, unsigned long end_pfn);
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extern void free_initmem(void);
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extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);

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#endif	/* !__ASSEMBLY__ */
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#ifdef CONFIG_FLATMEM
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#define pfn_valid(pfn)          ((pfn) < max_pfn)
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#endif


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#endif /* ASM_X86__PAGE_64_H */