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#ifndef _X86_64_PAGE_H
#define _X86_64_PAGE_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 ... */
#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 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 __level4(x) ((level4_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
#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>
#include <linux/stringify.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 %c1 ; .short %c0" :: "i"(__LINE__), \
"i" (__stringify(KBUILD_BASENAME)))
#define HEADER_BUG() asm volatile("ud2 ; .quad %c1 ; .short %c0" :: "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)
#endif /* __KERNEL__ */
#endif /* _X86_64_PAGE_H */
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