1 #ifndef _ASM_IA64_PAGE_H
2 #define _ASM_IA64_PAGE_H
4 * Pagetable related stuff.
6 * Copyright (C) 1998, 1999 Hewlett-Packard Co
7 * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
10 #include <linux/config.h>
12 #include <asm/types.h>
15 * PAGE_SHIFT determines the actual kernel page size.
17 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
18 # define PAGE_SHIFT 12
19 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
20 # define PAGE_SHIFT 13
21 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
22 # define PAGE_SHIFT 14
23 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
24 # define PAGE_SHIFT 16
26 # error Unsupported page size!
29 #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
30 #define PAGE_MASK (~(PAGE_SIZE - 1))
31 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
34 # define __pa(x) ((x) - PAGE_OFFSET)
35 # define __va(x) ((x) + PAGE_OFFSET)
36 #else /* !__ASSEMBLY */
38 # define STRICT_MM_TYPECHECKS
40 extern void clear_page (void *page);
41 extern void copy_page (void *to, void *from);
44 * Note: the MAP_NR_*() macro can't use __pa() because MAP_NR_*(X) MUST
45 * map to something >= max_mapnr if X is outside the identity mapped
50 * The dense variant can be used as long as the size of memory holes isn't
53 #define MAP_NR_DENSE(addr) (((unsigned long) (addr) - PAGE_OFFSET) >> PAGE_SHIFT)
55 #ifdef CONFIG_IA64_GENERIC
56 # include <asm/machvec.h>
57 # define virt_to_page(kaddr) (mem_map + platform_map_nr(kaddr))
58 # define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
59 #elif defined (CONFIG_IA64_SGI_SN1)
60 # ifndef CONFIG_DISCONTIGMEM
61 # define virt_to_page(kaddr) (mem_map + MAP_NR_DENSE(kaddr))
62 # define page_to_phys(page) XXX fix me
65 # define virt_to_page(kaddr) (mem_map + MAP_NR_DENSE(kaddr))
66 # define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
70 extern int ia64_page_valid (struct page *);
71 #define VALID_PAGE(page) (((page - mem_map) < max_mapnr) && ia64_page_valid(page))
73 typedef union ia64_va {
75 unsigned long off : 61; /* intra-region offset */
76 unsigned long reg : 3; /* region number */
83 * Note: These macros depend on the fact that PAGE_OFFSET has all
84 * region bits set to 1 and all other bits set to zero. They are
85 * expressed in this way to ensure they result in a single "dep"
88 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
89 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
91 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
92 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
94 #define REGION_SIZE REGION_NUMBER(1)
95 #define REGION_KERNEL 7
97 #define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; } while (0)
98 #define PAGE_BUG(page) do { BUG(); } while (0)
100 static __inline__ int
101 get_order (unsigned long size)
106 __asm__ ("getf.exp %0=%1" : "=r"(order) : "f"(d));
107 order = order - PAGE_SHIFT - 0xffff + 1;
113 # endif /* __KERNEL__ */
114 #endif /* !__ASSEMBLY__ */
116 #ifdef STRICT_MM_TYPECHECKS
118 * These are used to make use of C type-checking..
120 typedef struct { unsigned long pte; } pte_t;
121 typedef struct { unsigned long pmd; } pmd_t;
122 typedef struct { unsigned long pgd; } pgd_t;
123 typedef struct { unsigned long pgprot; } pgprot_t;
125 # define pte_val(x) ((x).pte)
126 # define pmd_val(x) ((x).pmd)
127 # define pgd_val(x) ((x).pgd)
128 # define pgprot_val(x) ((x).pgprot)
130 # define __pte(x) ((pte_t) { (x) } )
131 # define __pgprot(x) ((pgprot_t) { (x) } )
133 #else /* !STRICT_MM_TYPECHECKS */
135 * .. while these make it easier on the compiler
137 # ifndef __ASSEMBLY__
138 typedef unsigned long pte_t;
139 typedef unsigned long pmd_t;
140 typedef unsigned long pgd_t;
141 typedef unsigned long pgprot_t;
144 # define pte_val(x) (x)
145 # define pmd_val(x) (x)
146 # define pgd_val(x) (x)
147 # define pgprot_val(x) (x)
149 # define __pte(x) (x)
150 # define __pgd(x) (x)
151 # define __pgprot(x) (x)
152 #endif /* !STRICT_MM_TYPECHECKS */
154 #define PAGE_OFFSET 0xe000000000000000
156 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
157 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
158 (((current->thread.flags & IA64_THREAD_XSTACK) != 0) \
161 #endif /* _ASM_IA64_PAGE_H */