page.h (5621B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _PARISC_PAGE_H 3#define _PARISC_PAGE_H 4 5#include <linux/const.h> 6 7#if defined(CONFIG_PARISC_PAGE_SIZE_4KB) 8# define PAGE_SHIFT 12 9#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB) 10# define PAGE_SHIFT 14 11#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB) 12# define PAGE_SHIFT 16 13#else 14# error "unknown default kernel page size" 15#endif 16#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) 17#define PAGE_MASK (~(PAGE_SIZE-1)) 18 19 20#ifndef __ASSEMBLY__ 21 22#include <asm/types.h> 23#include <asm/cache.h> 24 25#define clear_page(page) clear_page_asm((void *)(page)) 26#define copy_page(to, from) copy_page_asm((void *)(to), (void *)(from)) 27 28struct page; 29struct vm_area_struct; 30 31void clear_page_asm(void *page); 32void copy_page_asm(void *to, void *from); 33#define clear_user_page(vto, vaddr, page) clear_page_asm(vto) 34void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr, 35 struct vm_area_struct *vma); 36#define __HAVE_ARCH_COPY_USER_HIGHPAGE 37 38/* 39 * These are used to make use of C type-checking.. 40 */ 41#define STRICT_MM_TYPECHECKS 42#ifdef STRICT_MM_TYPECHECKS 43typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */ 44 45/* NOTE: even on 64 bits, these entries are __u32 because we allocate 46 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */ 47typedef struct { __u32 pgd; } pgd_t; 48typedef struct { unsigned long pgprot; } pgprot_t; 49 50#if CONFIG_PGTABLE_LEVELS == 3 51typedef struct { __u32 pmd; } pmd_t; 52#define __pmd(x) ((pmd_t) { (x) } ) 53/* pXd_val() do not work as lvalues, so make sure we don't use them as such. */ 54#define pmd_val(x) ((x).pmd + 0) 55#endif 56 57#define pte_val(x) ((x).pte) 58#define pgd_val(x) ((x).pgd + 0) 59#define pgprot_val(x) ((x).pgprot) 60 61#define __pte(x) ((pte_t) { (x) } ) 62#define __pgd(x) ((pgd_t) { (x) } ) 63#define __pgprot(x) ((pgprot_t) { (x) } ) 64 65#else 66/* 67 * .. while these make it easier on the compiler 68 */ 69typedef unsigned long pte_t; 70 71#if CONFIG_PGTABLE_LEVELS == 3 72typedef __u32 pmd_t; 73#define pmd_val(x) (x) 74#define __pmd(x) (x) 75#endif 76 77typedef __u32 pgd_t; 78typedef unsigned long pgprot_t; 79 80#define pte_val(x) (x) 81#define pgd_val(x) (x) 82#define pgprot_val(x) (x) 83 84#define __pte(x) (x) 85#define __pgd(x) (x) 86#define __pgprot(x) (x) 87 88#endif /* STRICT_MM_TYPECHECKS */ 89 90#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) 91#if CONFIG_PGTABLE_LEVELS == 3 92#define set_pud(pudptr, pudval) (*(pudptr) = (pudval)) 93#endif 94 95typedef struct page *pgtable_t; 96 97typedef struct __physmem_range { 98 unsigned long start_pfn; 99 unsigned long pages; /* PAGE_SIZE pages */ 100} physmem_range_t; 101 102extern physmem_range_t pmem_ranges[]; 103extern int npmem_ranges; 104 105#endif /* !__ASSEMBLY__ */ 106 107/* WARNING: The definitions below must match exactly to sizeof(pte_t) 108 * etc 109 */ 110#ifdef CONFIG_64BIT 111#define BITS_PER_PTE_ENTRY 3 112#define BITS_PER_PMD_ENTRY 2 113#define BITS_PER_PGD_ENTRY 2 114#else 115#define BITS_PER_PTE_ENTRY 2 116#define BITS_PER_PMD_ENTRY 2 117#define BITS_PER_PGD_ENTRY 2 118#endif 119#define PGD_ENTRY_SIZE (1UL << BITS_PER_PGD_ENTRY) 120#define PMD_ENTRY_SIZE (1UL << BITS_PER_PMD_ENTRY) 121#define PTE_ENTRY_SIZE (1UL << BITS_PER_PTE_ENTRY) 122 123#define LINUX_GATEWAY_SPACE 0 124 125/* This governs the relationship between virtual and physical addresses. 126 * If you alter it, make sure to take care of our various fixed mapping 127 * segments in fixmap.h */ 128#ifdef CONFIG_64BIT 129#define __PAGE_OFFSET_DEFAULT (0x40000000) /* 1GB */ 130#else 131#define __PAGE_OFFSET_DEFAULT (0x10000000) /* 256MB */ 132#endif 133 134#if defined(BOOTLOADER) 135#define __PAGE_OFFSET (0) /* bootloader uses physical addresses */ 136#else 137#define __PAGE_OFFSET __PAGE_OFFSET_DEFAULT 138#endif /* BOOTLOADER */ 139 140#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET) 141 142/* The size of the gateway page (we leave lots of room for expansion) */ 143#define GATEWAY_PAGE_SIZE 0x4000 144 145/* The start of the actual kernel binary---used in vmlinux.lds.S 146 * Leave some space after __PAGE_OFFSET for detecting kernel null 147 * ptr derefs */ 148#define KERNEL_BINARY_TEXT_START (__PAGE_OFFSET + 0x100000) 149 150/* These macros don't work for 64-bit C code -- don't allow in C at all */ 151#ifdef __ASSEMBLY__ 152# define PA(x) ((x)-__PAGE_OFFSET) 153# define VA(x) ((x)+__PAGE_OFFSET) 154#endif 155#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET) 156#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET)) 157 158#ifndef CONFIG_SPARSEMEM 159#define pfn_valid(pfn) ((pfn) < max_mapnr) 160#endif 161 162#ifdef CONFIG_HUGETLB_PAGE 163#define HPAGE_SHIFT PMD_SHIFT /* fixed for transparent huge pages */ 164#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) 165#define HPAGE_MASK (~(HPAGE_SIZE - 1)) 166#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 167 168#if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB) 169# define REAL_HPAGE_SHIFT 20 /* 20 = 1MB */ 170# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M 171#elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB) 172# define REAL_HPAGE_SHIFT 22 /* 22 = 4MB */ 173# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M 174#else 175# define REAL_HPAGE_SHIFT 24 /* 24 = 16MB */ 176# define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M 177#endif 178#endif /* CONFIG_HUGETLB_PAGE */ 179 180#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 181 182#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 183#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 184 185#include <asm-generic/memory_model.h> 186#include <asm-generic/getorder.h> 187#include <asm/pdc.h> 188 189#define PAGE0 ((struct zeropage *)absolute_pointer(__PAGE_OFFSET)) 190 191/* DEFINITION OF THE ZERO-PAGE (PAG0) */ 192/* based on work by Jason Eckhardt (jason@equator.com) */ 193 194#endif /* _PARISC_PAGE_H */