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