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 <linux/config.h> 11 12#include <asm/intrinsics.h> 13#include <asm/types.h> 14 15/* 16 * PAGE_SHIFT determines the actual kernel page size. 17 */ 18#if defined(CONFIG_IA64_PAGE_SIZE_4KB) 19# define PAGE_SHIFT 12 20#elif defined(CONFIG_IA64_PAGE_SIZE_8KB) 21# define PAGE_SHIFT 13 22#elif defined(CONFIG_IA64_PAGE_SIZE_16KB) 23# define PAGE_SHIFT 14 24#elif defined(CONFIG_IA64_PAGE_SIZE_64KB) 25# define PAGE_SHIFT 16 26#else 27# error Unsupported page size! 28#endif 29 30#define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT) 31#define PAGE_MASK (~(PAGE_SIZE - 1)) 32#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) 33 34#define PERCPU_PAGE_SHIFT 16 /* log2() of max. size of per-CPU area */ 35#define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT) 36 37#define RGN_MAP_LIMIT ((1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE) /* per region addr limit */ 38 39#ifdef CONFIG_HUGETLB_PAGE 40# define REGION_HPAGE (4UL) /* note: this is hardcoded in reload_context()!*/ 41# define REGION_SHIFT 61 42# define HPAGE_REGION_BASE (REGION_HPAGE << REGION_SHIFT) 43# define HPAGE_SHIFT hpage_shift 44# define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */ 45# define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT) 46# define HPAGE_MASK (~(HPAGE_SIZE - 1)) 47 48# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 49# define ARCH_HAS_HUGEPAGE_ONLY_RANGE 50#endif /* CONFIG_HUGETLB_PAGE */ 51 52#ifdef __ASSEMBLY__ 53# define __pa(x) ((x) - PAGE_OFFSET) 54# define __va(x) ((x) + PAGE_OFFSET) 55#else /* !__ASSEMBLY */ 56# ifdef __KERNEL__ 57# define STRICT_MM_TYPECHECKS 58 59extern void clear_page (void *page); 60extern void copy_page (void *to, void *from); 61 62/* 63 * clear_user_page() and copy_user_page() can't be inline functions because 64 * flush_dcache_page() can't be defined until later... 65 */ 66#define clear_user_page(addr, vaddr, page) \ 67do { \ 68 clear_page(addr); \ 69 flush_dcache_page(page); \ 70} while (0) 71 72#define copy_user_page(to, from, vaddr, page) \ 73do { \ 74 copy_page((to), (from)); \ 75 flush_dcache_page(page); \ 76} while (0) 77 78#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 79 80#ifdef CONFIG_VIRTUAL_MEM_MAP 81extern int ia64_pfn_valid (unsigned long pfn); 82#else 83# define ia64_pfn_valid(pfn) 1 84#endif 85 86#ifndef CONFIG_DISCONTIGMEM 87#define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn)) 88#define page_to_pfn(page) ((unsigned long) (page - mem_map)) 89#define pfn_to_page(pfn) (mem_map + (pfn)) 90#endif /* CONFIG_DISCONTIGMEM */ 91 92#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 93#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 94 95typedef union ia64_va { 96 struct { 97 unsigned long off : 61; /* intra-region offset */ 98 unsigned long reg : 3; /* region number */ 99 } f; 100 unsigned long l; 101 void *p; 102} ia64_va; 103 104/* 105 * Note: These macros depend on the fact that PAGE_OFFSET has all 106 * region bits set to 1 and all other bits set to zero. They are 107 * expressed in this way to ensure they result in a single "dep" 108 * instruction. 109 */ 110#define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;}) 111#define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;}) 112 113#define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;}) 114#define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;}) 115 116#define REGION_SIZE REGION_NUMBER(1) 117#define REGION_KERNEL 7 118 119#ifdef CONFIG_HUGETLB_PAGE 120# define htlbpage_to_page(x) ((REGION_NUMBER(x) << 61) \ 121 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT))) 122# define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 123# define is_hugepage_only_range(addr, len) \ 124 (REGION_NUMBER(addr) == REGION_HPAGE && \ 125 REGION_NUMBER((addr)+(len)) == REGION_HPAGE) 126extern unsigned int hpage_shift; 127#endif 128 129static __inline__ int 130get_order (unsigned long size) 131{ 132 long double d = size - 1; 133 long order; 134 135 order = ia64_getf_exp(d); 136 order = order - PAGE_SHIFT - 0xffff + 1; 137 if (order < 0) 138 order = 0; 139 return order; 140} 141 142# endif /* __KERNEL__ */ 143#endif /* !__ASSEMBLY__ */ 144 145#ifdef STRICT_MM_TYPECHECKS 146 /* 147 * These are used to make use of C type-checking.. 148 */ 149 typedef struct { unsigned long pte; } pte_t; 150 typedef struct { unsigned long pmd; } pmd_t; 151 typedef struct { unsigned long pgd; } pgd_t; 152 typedef struct { unsigned long pgprot; } pgprot_t; 153 154# define pte_val(x) ((x).pte) 155# define pmd_val(x) ((x).pmd) 156# define pgd_val(x) ((x).pgd) 157# define pgprot_val(x) ((x).pgprot) 158 159# define __pte(x) ((pte_t) { (x) } ) 160# define __pgprot(x) ((pgprot_t) { (x) } ) 161 162#else /* !STRICT_MM_TYPECHECKS */ 163 /* 164 * .. while these make it easier on the compiler 165 */ 166# ifndef __ASSEMBLY__ 167 typedef unsigned long pte_t; 168 typedef unsigned long pmd_t; 169 typedef unsigned long pgd_t; 170 typedef unsigned long pgprot_t; 171# endif 172 173# define pte_val(x) (x) 174# define pmd_val(x) (x) 175# define pgd_val(x) (x) 176# define pgprot_val(x) (x) 177 178# define __pte(x) (x) 179# define __pgd(x) (x) 180# define __pgprot(x) (x) 181#endif /* !STRICT_MM_TYPECHECKS */ 182 183#define PAGE_OFFSET 0xe000000000000000 184 185#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 186 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \ 187 (((current->personality & READ_IMPLIES_EXEC) != 0) \ 188 ? VM_EXEC : 0)) 189 190#endif /* _ASM_IA64_PAGE_H */ 191