1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _M68K_PGTABLE_H 3 #define _M68K_PGTABLE_H 4 5 6 #if defined(CONFIG_SUN3) || defined(CONFIG_COLDFIRE) 7 #include <asm-generic/pgtable-nopmd.h> 8 #else 9 #include <asm-generic/pgtable-nopud.h> 10 #endif 11 12 #include <asm/setup.h> 13 14 #ifndef __ASSEMBLY__ 15 #include <asm/processor.h> 16 #include <linux/sched.h> 17 #include <linux/threads.h> 18 19 /* 20 * This file contains the functions and defines necessary to modify and use 21 * the m68k page table tree. 22 */ 23 24 #include <asm/virtconvert.h> 25 26 /* Certain architectures need to do special things when pte's 27 * within a page table are directly modified. Thus, the following 28 * hook is made available. 29 */ 30 #define set_pte(pteptr, pteval) \ 31 do{ \ 32 *(pteptr) = (pteval); \ 33 } while(0) 34 35 /* PMD_SHIFT determines the size of the area a second-level page table can map */ 36 #if CONFIG_PGTABLE_LEVELS == 3 37 #define PMD_SHIFT 18 38 #endif 39 #define PMD_SIZE (1UL << PMD_SHIFT) 40 #define PMD_MASK (~(PMD_SIZE-1)) 41 42 /* PGDIR_SHIFT determines what a third-level page table entry can map */ 43 #ifdef CONFIG_SUN3 44 #define PGDIR_SHIFT 17 45 #elif defined(CONFIG_COLDFIRE) 46 #define PGDIR_SHIFT 22 47 #else 48 #define PGDIR_SHIFT 25 49 #endif 50 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 51 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 52 53 /* 54 * entries per page directory level: the m68k is configured as three-level, 55 * so we do have PMD level physically. 56 */ 57 #ifdef CONFIG_SUN3 58 #define PTRS_PER_PTE 16 59 #define __PAGETABLE_PMD_FOLDED 1 60 #define PTRS_PER_PMD 1 61 #define PTRS_PER_PGD 2048 62 #elif defined(CONFIG_COLDFIRE) 63 #define PTRS_PER_PTE 512 64 #define __PAGETABLE_PMD_FOLDED 1 65 #define PTRS_PER_PMD 1 66 #define PTRS_PER_PGD 1024 67 #else 68 #define PTRS_PER_PTE 64 69 #define PTRS_PER_PMD 128 70 #define PTRS_PER_PGD 128 71 #endif 72 #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE) 73 74 /* Virtual address region for use by kernel_map() */ 75 #ifdef CONFIG_SUN3 76 #define KMAP_START 0x0dc00000 77 #define KMAP_END 0x0e000000 78 #elif defined(CONFIG_COLDFIRE) 79 #define KMAP_START 0xe0000000 80 #define KMAP_END 0xf0000000 81 #elif defined(CONFIG_VIRT) 82 #define KMAP_START 0xdf000000 83 #define KMAP_END 0xff000000 84 #else 85 #define KMAP_START 0xd0000000 86 #define KMAP_END 0xf0000000 87 #endif 88 89 #ifdef CONFIG_SUN3 90 extern unsigned long m68k_vmalloc_end; 91 #define VMALLOC_START 0x0f800000 92 #define VMALLOC_END m68k_vmalloc_end 93 #elif defined(CONFIG_COLDFIRE) 94 #define VMALLOC_START 0xd0000000 95 #define VMALLOC_END 0xe0000000 96 #elif defined(CONFIG_VIRT) 97 #define VMALLOC_OFFSET PAGE_SIZE 98 #define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) 99 #define VMALLOC_END KMAP_START 100 #else 101 /* Just any arbitrary offset to the start of the vmalloc VM area: the 102 * current 8MB value just means that there will be a 8MB "hole" after the 103 * physical memory until the kernel virtual memory starts. That means that 104 * any out-of-bounds memory accesses will hopefully be caught. 105 * The vmalloc() routines leaves a hole of 4kB between each vmalloced 106 * area for the same reason. ;) 107 */ 108 #define VMALLOC_OFFSET (8*1024*1024) 109 #define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) 110 #define VMALLOC_END KMAP_START 111 #endif 112 113 /* zero page used for uninitialized stuff */ 114 extern void *empty_zero_page; 115 116 /* 117 * ZERO_PAGE is a global shared page that is always zero: used 118 * for zero-mapped memory areas etc.. 119 */ 120 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 121 122 /* number of bits that fit into a memory pointer */ 123 #define BITS_PER_PTR (8*sizeof(unsigned long)) 124 125 /* to align the pointer to a pointer address */ 126 #define PTR_MASK (~(sizeof(void*)-1)) 127 128 /* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */ 129 /* 64-bit machines, beware! SRB. */ 130 #define SIZEOF_PTR_LOG2 2 131 132 extern void kernel_set_cachemode(void *addr, unsigned long size, int cmode); 133 134 /* 135 * The m68k doesn't have any external MMU info: the kernel page 136 * tables contain all the necessary information. The Sun3 does, but 137 * they are updated on demand. 138 */ 139 static inline void update_mmu_cache_range(struct vm_fault *vmf, 140 struct vm_area_struct *vma, unsigned long address, 141 pte_t *ptep, unsigned int nr) 142 { 143 } 144 145 #define update_mmu_cache(vma, addr, ptep) \ 146 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 147 148 #endif /* !__ASSEMBLY__ */ 149 150 /* MMU-specific headers */ 151 152 #ifdef CONFIG_SUN3 153 #include <asm/sun3_pgtable.h> 154 #elif defined(CONFIG_COLDFIRE) 155 #include <asm/mcf_pgtable.h> 156 #else 157 #include <asm/motorola_pgtable.h> 158 #endif 159 160 #ifndef __ASSEMBLY__ 161 /* 162 * Macro to mark a page protection value as "uncacheable". 163 */ 164 #ifdef CONFIG_COLDFIRE 165 # define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | CF_PAGE_NOCACHE)) 166 #else 167 #ifdef SUN3_PAGE_NOCACHE 168 # define __SUN3_PAGE_NOCACHE SUN3_PAGE_NOCACHE 169 #else 170 # define __SUN3_PAGE_NOCACHE 0 171 #endif 172 #define pgprot_noncached(prot) \ 173 (MMU_IS_SUN3 \ 174 ? (__pgprot(pgprot_val(prot) | __SUN3_PAGE_NOCACHE)) \ 175 : ((MMU_IS_851 || MMU_IS_030) \ 176 ? (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE030)) \ 177 : (MMU_IS_040 || MMU_IS_060) \ 178 ? (__pgprot((pgprot_val(prot) & _CACHEMASK040) | _PAGE_NOCACHE_S)) \ 179 : (prot))) 180 181 pgprot_t pgprot_dmacoherent(pgprot_t prot); 182 #define pgprot_dmacoherent(prot) pgprot_dmacoherent(prot) 183 184 #endif /* CONFIG_COLDFIRE */ 185 #endif /* !__ASSEMBLY__ */ 186 187 #endif /* _M68K_PGTABLE_H */ 188