1 #ifndef _ASM_IA64_PAGE_H 2 #define _ASM_IA64_PAGE_H 3 /* 4 * Pagetable related stuff. 5 * 6 * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co 7 * David Mosberger-Tang <davidm@hpl.hp.com> 8 */ 9 10 #include <asm/intrinsics.h> 11 #include <asm/types.h> 12 13 /* 14 * The top three bits of an IA64 address are its Region Number. 15 * Different regions are assigned to different purposes. 16 */ 17 #define RGN_SHIFT (61) 18 #define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT) 19 #define RGN_BITS (RGN_BASE(-1)) 20 21 #define RGN_KERNEL 7 /* Identity mapped region */ 22 #define RGN_UNCACHED 6 /* Identity mapped I/O region */ 23 #define RGN_GATE 5 /* Gate page, Kernel text, etc */ 24 #define RGN_HPAGE 4 /* For Huge TLB pages */ 25 26 /* 27 * PAGE_SHIFT determines the actual kernel page size. 28 */ 29 #if defined(CONFIG_IA64_PAGE_SIZE_4KB) 30 # define PAGE_SHIFT 12 31 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB) 32 # define PAGE_SHIFT 13 33 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB) 34 # define PAGE_SHIFT 14 35 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB) 36 # define PAGE_SHIFT 16 37 #else 38 # error Unsupported page size! 39 #endif 40 41 #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT) 42 #define PAGE_MASK (~(PAGE_SIZE - 1)) 43 44 #define PERCPU_PAGE_SHIFT 18 /* log2() of max. size of per-CPU area */ 45 #define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT) 46 47 48 #ifdef CONFIG_HUGETLB_PAGE 49 # define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE) 50 # define HPAGE_SHIFT hpage_shift 51 # define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */ 52 # define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT) 53 # define HPAGE_MASK (~(HPAGE_SIZE - 1)) 54 55 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 56 #endif /* CONFIG_HUGETLB_PAGE */ 57 58 #ifdef __ASSEMBLY__ 59 # define __pa(x) ((x) - PAGE_OFFSET) 60 # define __va(x) ((x) + PAGE_OFFSET) 61 #else /* !__ASSEMBLY */ 62 # define STRICT_MM_TYPECHECKS 63 64 extern void clear_page (void *page); 65 extern void copy_page (void *to, void *from); 66 67 /* 68 * clear_user_page() and copy_user_page() can't be inline functions because 69 * flush_dcache_page() can't be defined until later... 70 */ 71 #define clear_user_page(addr, vaddr, page) \ 72 do { \ 73 clear_page(addr); \ 74 flush_dcache_page(page); \ 75 } while (0) 76 77 #define copy_user_page(to, from, vaddr, page) \ 78 do { \ 79 copy_page((to), (from)); \ 80 flush_dcache_page(page); \ 81 } while (0) 82 83 84 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 85 ({ \ 86 struct page *page = alloc_page_vma( \ 87 GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr); \ 88 if (page) \ 89 flush_dcache_page(page); \ 90 page; \ 91 }) 92 93 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 94 95 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 96 97 #ifdef CONFIG_VIRTUAL_MEM_MAP 98 extern int ia64_pfn_valid (unsigned long pfn); 99 #else 100 # define ia64_pfn_valid(pfn) 1 101 #endif 102 103 #ifdef CONFIG_VIRTUAL_MEM_MAP 104 extern struct page *vmem_map; 105 #ifdef CONFIG_DISCONTIGMEM 106 # define page_to_pfn(page) ((unsigned long) (page - vmem_map)) 107 # define pfn_to_page(pfn) (vmem_map + (pfn)) 108 #else 109 # include <asm-generic/memory_model.h> 110 #endif 111 #else 112 # include <asm-generic/memory_model.h> 113 #endif 114 115 #ifdef CONFIG_FLATMEM 116 # define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn)) 117 #elif defined(CONFIG_DISCONTIGMEM) 118 extern unsigned long min_low_pfn; 119 extern unsigned long max_low_pfn; 120 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn)) 121 #endif 122 123 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 124 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 125 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 126 127 typedef union ia64_va { 128 struct { 129 unsigned long off : 61; /* intra-region offset */ 130 unsigned long reg : 3; /* region number */ 131 } f; 132 unsigned long l; 133 void *p; 134 } ia64_va; 135 136 /* 137 * Note: These macros depend on the fact that PAGE_OFFSET has all 138 * region bits set to 1 and all other bits set to zero. They are 139 * expressed in this way to ensure they result in a single "dep" 140 * instruction. 141 */ 142 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;}) 143 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;}) 144 145 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;}) 146 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;}) 147 148 #ifdef CONFIG_HUGETLB_PAGE 149 # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \ 150 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT))) 151 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 152 extern unsigned int hpage_shift; 153 #endif 154 155 static __inline__ int 156 get_order (unsigned long size) 157 { 158 long double d = size - 1; 159 long order; 160 161 order = ia64_getf_exp(d); 162 order = order - PAGE_SHIFT - 0xffff + 1; 163 if (order < 0) 164 order = 0; 165 return order; 166 } 167 168 #endif /* !__ASSEMBLY__ */ 169 170 #ifdef STRICT_MM_TYPECHECKS 171 /* 172 * These are used to make use of C type-checking.. 173 */ 174 typedef struct { unsigned long pte; } pte_t; 175 typedef struct { unsigned long pmd; } pmd_t; 176 #ifdef CONFIG_PGTABLE_4 177 typedef struct { unsigned long pud; } pud_t; 178 #endif 179 typedef struct { unsigned long pgd; } pgd_t; 180 typedef struct { unsigned long pgprot; } pgprot_t; 181 typedef struct page *pgtable_t; 182 183 # define pte_val(x) ((x).pte) 184 # define pmd_val(x) ((x).pmd) 185 #ifdef CONFIG_PGTABLE_4 186 # define pud_val(x) ((x).pud) 187 #endif 188 # define pgd_val(x) ((x).pgd) 189 # define pgprot_val(x) ((x).pgprot) 190 191 # define __pte(x) ((pte_t) { (x) } ) 192 # define __pmd(x) ((pmd_t) { (x) } ) 193 # define __pgprot(x) ((pgprot_t) { (x) } ) 194 195 #else /* !STRICT_MM_TYPECHECKS */ 196 /* 197 * .. while these make it easier on the compiler 198 */ 199 # ifndef __ASSEMBLY__ 200 typedef unsigned long pte_t; 201 typedef unsigned long pmd_t; 202 typedef unsigned long pgd_t; 203 typedef unsigned long pgprot_t; 204 typedef struct page *pgtable_t; 205 # endif 206 207 # define pte_val(x) (x) 208 # define pmd_val(x) (x) 209 # define pgd_val(x) (x) 210 # define pgprot_val(x) (x) 211 212 # define __pte(x) (x) 213 # define __pgd(x) (x) 214 # define __pgprot(x) (x) 215 #endif /* !STRICT_MM_TYPECHECKS */ 216 217 #define PAGE_OFFSET RGN_BASE(RGN_KERNEL) 218 219 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 220 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \ 221 (((current->personality & READ_IMPLIES_EXEC) != 0) \ 222 ? VM_EXEC : 0)) 223 224 #define GATE_ADDR RGN_BASE(RGN_GATE) 225 226 /* 227 * 0xa000000000000000+2*PERCPU_PAGE_SIZE 228 * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page) 229 */ 230 #define KERNEL_START (GATE_ADDR+__IA64_UL_CONST(0x100000000)) 231 #define PERCPU_ADDR (-PERCPU_PAGE_SIZE) 232 #define LOAD_OFFSET (KERNEL_START - KERNEL_TR_PAGE_SIZE) 233 234 #define __HAVE_ARCH_GATE_AREA 1 235 236 #endif /* _ASM_IA64_PAGE_H */ 237