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 65extern void clear_page (void *page); 66extern 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) \ 73do { \ 74 clear_page(addr); \ 75 flush_dcache_page(page); \ 76} while (0) 77 78#define copy_user_page(to, from, vaddr, page) \ 79do { \ 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 99extern 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 105extern 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) 120extern unsigned long min_low_pfn; 121extern 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 129typedef 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) 154extern unsigned int hpage_shift; 155#endif 156 157static __inline__ int 158get_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