4 #include <linux/stringify.h>
6 /* PAGE_SHIFT determines the page size */
9 #define PAGE_SIZE (0x1 << PAGE_SHIFT)
11 #define PAGE_SIZE (1UL << PAGE_SHIFT)
13 #define PAGE_MASK (~(PAGE_SIZE-1))
15 #define __PHYSICAL_MASK 0x0000ffffffffffffUL
16 #define PHYSICAL_PAGE_MASK 0x0000fffffffff000UL
18 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
19 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
21 #define LARGE_PFN (LARGE_PAGE_SIZE / PAGE_SIZE)
23 #define KERNEL_TEXT_SIZE (40UL*1024*1024)
24 #define KERNEL_TEXT_START 0xffffffff80000000UL
26 /* Changing the next two defines should be enough to increase the kernel stack */
27 /* We still hope 8K is enough, but ... */
28 /* Currently it is actually ~6k. This would change when task_struct moves into
30 #define THREAD_ORDER 1
31 #define THREAD_SIZE (2*PAGE_SIZE)
33 #define INIT_TASK_SIZE THREAD_SIZE
34 #define CURRENT_MASK (~(THREAD_SIZE-1))
39 void clear_page(void *);
40 void copy_page(void *, void *);
42 #define clear_user_page(page, vaddr) clear_page(page)
43 #define copy_user_page(to, from, vaddr) copy_page(to, from)
46 * These are used to make use of C type-checking..
48 typedef struct { unsigned long pte; } pte_t;
49 typedef struct { unsigned long pmd; } pmd_t;
50 typedef struct { unsigned long pgd; } pgd_t;
51 typedef struct { unsigned long pml4; } pml4_t;
52 #define PTE_MASK PHYSICAL_PAGE_MASK
54 typedef struct { unsigned long pgprot; } pgprot_t;
56 #define pte_val(x) ((x).pte)
57 #define pmd_val(x) ((x).pmd)
58 #define pgd_val(x) ((x).pgd)
59 #define pml4_val(x) ((x).pml4)
60 #define pgprot_val(x) ((x).pgprot)
62 #define __pte(x) ((pte_t) { (x) } )
63 #define __pmd(x) ((pmd_t) { (x) } )
64 #define __pgd(x) ((pgd_t) { (x) } )
65 #define __level4(x) ((level4_t) { (x) } )
66 #define __pgprot(x) ((pgprot_t) { (x) } )
68 #endif /* !__ASSEMBLY__ */
70 /* to align the pointer to the (next) page boundary */
71 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
73 /* See Documentation/X86_64/mm.txt for a description of the layout. */
74 #define __START_KERNEL 0xffffffff80100000
75 #define __START_KERNEL_map 0xffffffff80000000
76 #define __PAGE_OFFSET 0x0000010000000000
80 #include <linux/config.h>
83 * Tell the user there is some problem. The exception handler decodes this frame.
87 char *filename; /* should use 32bit offset instead, but the assembler doesn't like it */
89 } __attribute__((packed));
90 #define BUG() asm volatile("ud2 ; .quad %c1 ; .short %c0" :: "i"(__LINE__), \
91 "i" (__stringify(KBUILD_BASENAME)))
92 #define HEADER_BUG() asm volatile("ud2 ; .quad %c1 ; .short %c0" :: "i"(__LINE__), \
93 "i" (__stringify(__FILE__)))
94 #define PAGE_BUG(page) BUG()
96 /* Pure 2^n version of get_order */
97 extern __inline__ int get_order(unsigned long size)
101 size = (size-1) >> (PAGE_SHIFT-1);
110 #endif /* __ASSEMBLY__ */
112 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
114 /* Note: __pa(&symbol_visible_to_c) should be always replaced with __pa_symbol.
115 Otherwise you risk miscompilation. */
116 #define __pa(x) (((unsigned long)(x)>=__START_KERNEL_map)?(unsigned long)(x) - (unsigned long)__START_KERNEL_map:(unsigned long)(x) - PAGE_OFFSET)
117 /* __pa_symbol should use for C visible symbols, but only for them.
118 This seems to be the official gcc blessed way to do such arithmetic. */
119 #define __pa_symbol(x) \
121 asm("" : "=r" (v) : "0" (x)); \
122 v - __START_KERNEL_map; })
123 #define __pa_maybe_symbol(x) \
125 asm("" : "=r" (v) : "0" (x)); \
128 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
129 #ifndef CONFIG_DISCONTIGMEM
130 #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
131 #define pfn_to_page(pfn) (mem_map + (pfn))
132 #define page_to_pfn(page) ((page) - mem_map)
133 #define page_to_phys(page) (((page) - mem_map) << PAGE_SHIFT)
134 #define VALID_PAGE(page) (((page) - mem_map) < max_mapnr)
137 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
140 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
141 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
143 #endif /* __KERNEL__ */
145 #endif /* _X86_64_PAGE_H */