1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * page.h: Various defines and such for MMU operations on the Sparc for 4 * the Linux kernel. 5 * 6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 7 */ 8 9 #ifndef _SPARC_PAGE_H 10 #define _SPARC_PAGE_H 11 12 #include <linux/const.h> 13 14 #define PAGE_SHIFT 12 15 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 16 #define PAGE_MASK (~(PAGE_SIZE-1)) 17 18 #ifndef __ASSEMBLY__ 19 20 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) 21 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE) 22 #define clear_user_page(addr, vaddr, page) \ 23 do { clear_page(addr); \ 24 sparc_flush_page_to_ram(page); \ 25 } while (0) 26 #define copy_user_page(to, from, vaddr, page) \ 27 do { copy_page(to, from); \ 28 sparc_flush_page_to_ram(page); \ 29 } while (0) 30 31 /* The following structure is used to hold the physical 32 * memory configuration of the machine. This is filled in 33 * prom_meminit() and is later used by mem_init() to set up 34 * mem_map[]. We statically allocate SPARC_PHYS_BANKS+1 of 35 * these structs, this is arbitrary. The entry after the 36 * last valid one has num_bytes==0. 37 */ 38 struct sparc_phys_banks { 39 unsigned long base_addr; 40 unsigned long num_bytes; 41 }; 42 43 #define SPARC_PHYS_BANKS 32 44 45 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; 46 47 /* passing structs on the Sparc slow us down tremendously... */ 48 49 /* #define STRICT_MM_TYPECHECKS */ 50 51 #ifdef STRICT_MM_TYPECHECKS 52 /* 53 * These are used to make use of C type-checking.. 54 */ 55 typedef struct { unsigned long pte; } pte_t; 56 typedef struct { unsigned long iopte; } iopte_t; 57 typedef struct { unsigned long pmd; } pmd_t; 58 typedef struct { unsigned long pgd; } pgd_t; 59 typedef struct { unsigned long ctxd; } ctxd_t; 60 typedef struct { unsigned long pgprot; } pgprot_t; 61 typedef struct { unsigned long iopgprot; } iopgprot_t; 62 63 #define pte_val(x) ((x).pte) 64 #define iopte_val(x) ((x).iopte) 65 #define pmd_val(x) ((x).pmd) 66 #define pgd_val(x) ((x).pgd) 67 #define ctxd_val(x) ((x).ctxd) 68 #define pgprot_val(x) ((x).pgprot) 69 #define iopgprot_val(x) ((x).iopgprot) 70 71 #define __pte(x) ((pte_t) { (x) } ) 72 #define __pmd(x) ((pmd_t) { { (x) }, }) 73 #define __iopte(x) ((iopte_t) { (x) } ) 74 #define __pgd(x) ((pgd_t) { (x) } ) 75 #define __ctxd(x) ((ctxd_t) { (x) } ) 76 #define __pgprot(x) ((pgprot_t) { (x) } ) 77 #define __iopgprot(x) ((iopgprot_t) { (x) } ) 78 79 #else 80 /* 81 * .. while these make it easier on the compiler 82 */ 83 typedef unsigned long pte_t; 84 typedef unsigned long iopte_t; 85 typedef unsigned long pmd_t; 86 typedef unsigned long pgd_t; 87 typedef unsigned long ctxd_t; 88 typedef unsigned long pgprot_t; 89 typedef unsigned long iopgprot_t; 90 91 #define pte_val(x) (x) 92 #define iopte_val(x) (x) 93 #define pmd_val(x) (x) 94 #define pgd_val(x) (x) 95 #define ctxd_val(x) (x) 96 #define pgprot_val(x) (x) 97 #define iopgprot_val(x) (x) 98 99 #define __pte(x) (x) 100 #define __pmd(x) (x) 101 #define __iopte(x) (x) 102 #define __pgd(x) (x) 103 #define __ctxd(x) (x) 104 #define __pgprot(x) (x) 105 #define __iopgprot(x) (x) 106 107 #endif 108 109 typedef pte_t *pgtable_t; 110 111 #define TASK_UNMAPPED_BASE 0x50000000 112 113 #else /* !(__ASSEMBLY__) */ 114 115 #define __pgprot(x) (x) 116 117 #endif /* !(__ASSEMBLY__) */ 118 119 #define PAGE_OFFSET 0xf0000000 120 #ifndef __ASSEMBLY__ 121 extern unsigned long phys_base; 122 extern unsigned long pfn_base; 123 #endif 124 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + phys_base) 125 #define __va(x) ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET)) 126 127 #define virt_to_phys __pa 128 #define phys_to_virt __va 129 130 #define ARCH_PFN_OFFSET (pfn_base) 131 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 132 133 #define virt_addr_valid(kaddr) ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr) 134 135 #include <asm-generic/memory_model.h> 136 #include <asm-generic/getorder.h> 137 138 #endif /* _SPARC_PAGE_H */ 139