1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_IA64_PAGE_H 3 #define _ASM_IA64_PAGE_H 4 /* 5 * Pagetable related stuff. 6 * 7 * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co 8 * David Mosberger-Tang <davidm@hpl.hp.com> 9 */ 10 11 #include <asm/intrinsics.h> 12 #include <asm/types.h> 13 14 /* 15 * The top three bits of an IA64 address are its Region Number. 16 * Different regions are assigned to different purposes. 17 */ 18 #define RGN_SHIFT (61) 19 #define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT) 20 #define RGN_BITS (RGN_BASE(-1)) 21 22 #define RGN_KERNEL 7 /* Identity mapped region */ 23 #define RGN_UNCACHED 6 /* Identity mapped I/O region */ 24 #define RGN_GATE 5 /* Gate page, Kernel text, etc */ 25 #define RGN_HPAGE 4 /* For Huge TLB pages */ 26 27 /* 28 * PAGE_SHIFT determines the actual kernel page size. 29 */ 30 #if defined(CONFIG_IA64_PAGE_SIZE_4KB) 31 # define PAGE_SHIFT 12 32 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB) 33 # define PAGE_SHIFT 13 34 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB) 35 # define PAGE_SHIFT 14 36 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB) 37 # define PAGE_SHIFT 16 38 #else 39 # error Unsupported page size! 40 #endif 41 42 #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT) 43 #define PAGE_MASK (~(PAGE_SIZE - 1)) 44 45 #define PERCPU_PAGE_SHIFT 18 /* log2() of max. size of per-CPU area */ 46 #define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT) 47 48 49 #ifdef CONFIG_HUGETLB_PAGE 50 # define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE) 51 # define HPAGE_SHIFT hpage_shift 52 # define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */ 53 # define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT) 54 # define HPAGE_MASK (~(HPAGE_SIZE - 1)) 55 56 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 57 #endif /* CONFIG_HUGETLB_PAGE */ 58 59 #ifdef __ASSEMBLY__ 60 # define __pa(x) ((x) - PAGE_OFFSET) 61 # define __va(x) ((x) + PAGE_OFFSET) 62 #else /* !__ASSEMBLY */ 63 # define STRICT_MM_TYPECHECKS 64 65 extern void clear_page (void *page); 66 extern void copy_page (void *to, void *from); 67 68 /* 69 * clear_user_page() and copy_user_page() can't be inline functions because 70 * flush_dcache_page() can't be defined until later... 71 */ 72 #define clear_user_page(addr, vaddr, page) \ 73 do { \ 74 clear_page(addr); \ 75 flush_dcache_page(page); \ 76 } while (0) 77 78 #define copy_user_page(to, from, vaddr, page) \ 79 do { \ 80 copy_page((to), (from)); \ 81 flush_dcache_page(page); \ 82 } while (0) 83 84 85 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 86 ({ \ 87 struct page *page = alloc_page_vma( \ 88 GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr); \ 89 if (page) \ 90 flush_dcache_page(page); \ 91 page; \ 92 }) 93 94 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 95 96 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 97 98 #ifdef CONFIG_VIRTUAL_MEM_MAP 99 extern int ia64_pfn_valid (unsigned long pfn); 100 #else 101 # define ia64_pfn_valid(pfn) 1 102 #endif 103 104 #ifdef CONFIG_VIRTUAL_MEM_MAP 105 extern struct page *vmem_map; 106 #ifdef CONFIG_DISCONTIGMEM 107 # define page_to_pfn(page) ((unsigned long) (page - vmem_map)) 108 # define pfn_to_page(pfn) (vmem_map + (pfn)) 109 # define __pfn_to_phys(pfn) PFN_PHYS(pfn) 110 #else 111 # include <asm-generic/memory_model.h> 112 #endif 113 #else 114 # include <asm-generic/memory_model.h> 115 #endif 116 117 #ifdef CONFIG_FLATMEM 118 # define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn)) 119 #elif defined(CONFIG_DISCONTIGMEM) 120 extern unsigned long min_low_pfn; 121 extern unsigned long max_low_pfn; 122 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn)) 123 #endif 124 125 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 126 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 127 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 128 129 typedef union ia64_va { 130 struct { 131 unsigned long off : 61; /* intra-region offset */ 132 unsigned long reg : 3; /* region number */ 133 } f; 134 unsigned long l; 135 void *p; 136 } ia64_va; 137 138 /* 139 * Note: These macros depend on the fact that PAGE_OFFSET has all 140 * region bits set to 1 and all other bits set to zero. They are 141 * expressed in this way to ensure they result in a single "dep" 142 * instruction. 143 */ 144 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;}) 145 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;}) 146 147 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;}) 148 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;}) 149 150 #ifdef CONFIG_HUGETLB_PAGE 151 # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \ 152 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT))) 153 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 154 extern unsigned int hpage_shift; 155 #endif 156 157 static __inline__ int 158 get_order (unsigned long size) 159 { 160 long double d = size - 1; 161 long order; 162 163 order = ia64_getf_exp(d); 164 order = order - PAGE_SHIFT - 0xffff + 1; 165 if (order < 0) 166 order = 0; 167 return order; 168 } 169 170 #endif /* !__ASSEMBLY__ */ 171 172 #ifdef STRICT_MM_TYPECHECKS 173 /* 174 * These are used to make use of C type-checking.. 175 */ 176 typedef struct { unsigned long pte; } pte_t; 177 typedef struct { unsigned long pmd; } pmd_t; 178 #if CONFIG_PGTABLE_LEVELS == 4 179 typedef struct { unsigned long pud; } pud_t; 180 #endif 181 typedef struct { unsigned long pgd; } pgd_t; 182 typedef struct { unsigned long pgprot; } pgprot_t; 183 typedef struct page *pgtable_t; 184 185 # define pte_val(x) ((x).pte) 186 # define pmd_val(x) ((x).pmd) 187 #if CONFIG_PGTABLE_LEVELS == 4 188 # define pud_val(x) ((x).pud) 189 #endif 190 # define pgd_val(x) ((x).pgd) 191 # define pgprot_val(x) ((x).pgprot) 192 193 # define __pte(x) ((pte_t) { (x) } ) 194 # define __pmd(x) ((pmd_t) { (x) } ) 195 # define __pgprot(x) ((pgprot_t) { (x) } ) 196 197 #else /* !STRICT_MM_TYPECHECKS */ 198 /* 199 * .. while these make it easier on the compiler 200 */ 201 # ifndef __ASSEMBLY__ 202 typedef unsigned long pte_t; 203 typedef unsigned long pmd_t; 204 typedef unsigned long pgd_t; 205 typedef unsigned long pgprot_t; 206 typedef struct page *pgtable_t; 207 # endif 208 209 # define pte_val(x) (x) 210 # define pmd_val(x) (x) 211 # define pgd_val(x) (x) 212 # define pgprot_val(x) (x) 213 214 # define __pte(x) (x) 215 # define __pgd(x) (x) 216 # define __pgprot(x) (x) 217 #endif /* !STRICT_MM_TYPECHECKS */ 218 219 #define PAGE_OFFSET RGN_BASE(RGN_KERNEL) 220 221 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC 222 223 #define GATE_ADDR RGN_BASE(RGN_GATE) 224 225 /* 226 * 0xa000000000000000+2*PERCPU_PAGE_SIZE 227 * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page) 228 */ 229 #define KERNEL_START (GATE_ADDR+__IA64_UL_CONST(0x100000000)) 230 #define PERCPU_ADDR (-PERCPU_PAGE_SIZE) 231 #define LOAD_OFFSET (KERNEL_START - KERNEL_TR_PAGE_SIZE) 232 233 #define __HAVE_ARCH_GATE_AREA 1 234 235 #endif /* _ASM_IA64_PAGE_H */ 236