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