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 #include <asm-generic/memory_model.h> 99 100 #ifdef CONFIG_FLATMEM 101 # define pfn_valid(pfn) ((pfn) < max_mapnr) 102 #endif 103 104 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 105 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 106 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 107 108 typedef union ia64_va { 109 struct { 110 unsigned long off : 61; /* intra-region offset */ 111 unsigned long reg : 3; /* region number */ 112 } f; 113 unsigned long l; 114 void *p; 115 } ia64_va; 116 117 /* 118 * Note: These macros depend on the fact that PAGE_OFFSET has all 119 * region bits set to 1 and all other bits set to zero. They are 120 * expressed in this way to ensure they result in a single "dep" 121 * instruction. 122 */ 123 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;}) 124 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;}) 125 126 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;}) 127 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;}) 128 129 #ifdef CONFIG_HUGETLB_PAGE 130 # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \ 131 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT))) 132 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 133 extern unsigned int hpage_shift; 134 #endif 135 136 static __inline__ int 137 get_order (unsigned long size) 138 { 139 long double d = size - 1; 140 long order; 141 142 order = ia64_getf_exp(d); 143 order = order - PAGE_SHIFT - 0xffff + 1; 144 if (order < 0) 145 order = 0; 146 return order; 147 } 148 149 #endif /* !__ASSEMBLY__ */ 150 151 #ifdef STRICT_MM_TYPECHECKS 152 /* 153 * These are used to make use of C type-checking.. 154 */ 155 typedef struct { unsigned long pte; } pte_t; 156 typedef struct { unsigned long pmd; } pmd_t; 157 #if CONFIG_PGTABLE_LEVELS == 4 158 typedef struct { unsigned long pud; } pud_t; 159 #endif 160 typedef struct { unsigned long pgd; } pgd_t; 161 typedef struct { unsigned long pgprot; } pgprot_t; 162 typedef struct page *pgtable_t; 163 164 # define pte_val(x) ((x).pte) 165 # define pmd_val(x) ((x).pmd) 166 #if CONFIG_PGTABLE_LEVELS == 4 167 # define pud_val(x) ((x).pud) 168 #endif 169 # define pgd_val(x) ((x).pgd) 170 # define pgprot_val(x) ((x).pgprot) 171 172 # define __pte(x) ((pte_t) { (x) } ) 173 # define __pmd(x) ((pmd_t) { (x) } ) 174 # define __pgprot(x) ((pgprot_t) { (x) } ) 175 176 #else /* !STRICT_MM_TYPECHECKS */ 177 /* 178 * .. while these make it easier on the compiler 179 */ 180 # ifndef __ASSEMBLY__ 181 typedef unsigned long pte_t; 182 typedef unsigned long pmd_t; 183 typedef unsigned long pgd_t; 184 typedef unsigned long pgprot_t; 185 typedef struct page *pgtable_t; 186 # endif 187 188 # define pte_val(x) (x) 189 # define pmd_val(x) (x) 190 # define pgd_val(x) (x) 191 # define pgprot_val(x) (x) 192 193 # define __pte(x) (x) 194 # define __pgd(x) (x) 195 # define __pgprot(x) (x) 196 #endif /* !STRICT_MM_TYPECHECKS */ 197 198 #define PAGE_OFFSET RGN_BASE(RGN_KERNEL) 199 200 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC 201 202 #define GATE_ADDR RGN_BASE(RGN_GATE) 203 204 /* 205 * 0xa000000000000000+2*PERCPU_PAGE_SIZE 206 * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page) 207 */ 208 #define KERNEL_START (GATE_ADDR+__IA64_UL_CONST(0x100000000)) 209 #define PERCPU_ADDR (-PERCPU_PAGE_SIZE) 210 #define LOAD_OFFSET (KERNEL_START - KERNEL_TR_PAGE_SIZE) 211 212 #define __HAVE_ARCH_GATE_AREA 1 213 214 #endif /* _ASM_IA64_PAGE_H */ 215