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