1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _M68K_TLBFLUSH_H 3 #define _M68K_TLBFLUSH_H 4 5 #ifdef CONFIG_MMU 6 #ifndef CONFIG_SUN3 7 8 #include <asm/current.h> 9 #include <asm/mcfmmu.h> 10 11 static inline void flush_tlb_kernel_page(void *addr) 12 { 13 if (CPU_IS_COLDFIRE) { 14 mmu_write(MMUOR, MMUOR_CNL); 15 } else if (CPU_IS_040_OR_060) { 16 mm_segment_t old_fs = get_fs(); 17 set_fs(KERNEL_DS); 18 __asm__ __volatile__(".chip 68040\n\t" 19 "pflush (%0)\n\t" 20 ".chip 68k" 21 : : "a" (addr)); 22 set_fs(old_fs); 23 } else if (CPU_IS_020_OR_030) 24 __asm__ __volatile__("pflush #4,#4,(%0)" : : "a" (addr)); 25 } 26 27 /* 28 * flush all user-space atc entries. 29 */ 30 static inline void __flush_tlb(void) 31 { 32 if (CPU_IS_COLDFIRE) { 33 mmu_write(MMUOR, MMUOR_CNL); 34 } else if (CPU_IS_040_OR_060) { 35 __asm__ __volatile__(".chip 68040\n\t" 36 "pflushan\n\t" 37 ".chip 68k"); 38 } else if (CPU_IS_020_OR_030) { 39 __asm__ __volatile__("pflush #0,#4"); 40 } 41 } 42 43 static inline void __flush_tlb040_one(unsigned long addr) 44 { 45 __asm__ __volatile__(".chip 68040\n\t" 46 "pflush (%0)\n\t" 47 ".chip 68k" 48 : : "a" (addr)); 49 } 50 51 static inline void __flush_tlb_one(unsigned long addr) 52 { 53 if (CPU_IS_COLDFIRE) 54 mmu_write(MMUOR, MMUOR_CNL); 55 else if (CPU_IS_040_OR_060) 56 __flush_tlb040_one(addr); 57 else if (CPU_IS_020_OR_030) 58 __asm__ __volatile__("pflush #0,#4,(%0)" : : "a" (addr)); 59 } 60 61 #define flush_tlb() __flush_tlb() 62 63 /* 64 * flush all atc entries (both kernel and user-space entries). 65 */ 66 static inline void flush_tlb_all(void) 67 { 68 if (CPU_IS_COLDFIRE) { 69 mmu_write(MMUOR, MMUOR_CNL); 70 } else if (CPU_IS_040_OR_060) { 71 __asm__ __volatile__(".chip 68040\n\t" 72 "pflusha\n\t" 73 ".chip 68k"); 74 } else if (CPU_IS_020_OR_030) { 75 __asm__ __volatile__("pflusha"); 76 } 77 } 78 79 static inline void flush_tlb_mm(struct mm_struct *mm) 80 { 81 if (mm == current->active_mm) 82 __flush_tlb(); 83 } 84 85 static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) 86 { 87 if (vma->vm_mm == current->active_mm) { 88 mm_segment_t old_fs = force_uaccess_begin(); 89 90 __flush_tlb_one(addr); 91 force_uaccess_end(old_fs); 92 } 93 } 94 95 static inline void flush_tlb_range(struct vm_area_struct *vma, 96 unsigned long start, unsigned long end) 97 { 98 if (vma->vm_mm == current->active_mm) 99 __flush_tlb(); 100 } 101 102 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end) 103 { 104 flush_tlb_all(); 105 } 106 107 #else 108 109 110 /* Reserved PMEGs. */ 111 extern char sun3_reserved_pmeg[SUN3_PMEGS_NUM]; 112 extern unsigned long pmeg_vaddr[SUN3_PMEGS_NUM]; 113 extern unsigned char pmeg_alloc[SUN3_PMEGS_NUM]; 114 extern unsigned char pmeg_ctx[SUN3_PMEGS_NUM]; 115 116 /* Flush all userspace mappings one by one... (why no flush command, 117 sun?) */ 118 static inline void flush_tlb_all(void) 119 { 120 unsigned long addr; 121 unsigned char ctx, oldctx; 122 123 oldctx = sun3_get_context(); 124 for(addr = 0x00000000; addr < TASK_SIZE; addr += SUN3_PMEG_SIZE) { 125 for(ctx = 0; ctx < 8; ctx++) { 126 sun3_put_context(ctx); 127 sun3_put_segmap(addr, SUN3_INVALID_PMEG); 128 } 129 } 130 131 sun3_put_context(oldctx); 132 /* erase all of the userspace pmeg maps, we've clobbered them 133 all anyway */ 134 for(addr = 0; addr < SUN3_INVALID_PMEG; addr++) { 135 if(pmeg_alloc[addr] == 1) { 136 pmeg_alloc[addr] = 0; 137 pmeg_ctx[addr] = 0; 138 pmeg_vaddr[addr] = 0; 139 } 140 } 141 142 } 143 144 /* Clear user TLB entries within the context named in mm */ 145 static inline void flush_tlb_mm (struct mm_struct *mm) 146 { 147 unsigned char oldctx; 148 unsigned char seg; 149 unsigned long i; 150 151 oldctx = sun3_get_context(); 152 sun3_put_context(mm->context); 153 154 for(i = 0; i < TASK_SIZE; i += SUN3_PMEG_SIZE) { 155 seg = sun3_get_segmap(i); 156 if(seg == SUN3_INVALID_PMEG) 157 continue; 158 159 sun3_put_segmap(i, SUN3_INVALID_PMEG); 160 pmeg_alloc[seg] = 0; 161 pmeg_ctx[seg] = 0; 162 pmeg_vaddr[seg] = 0; 163 } 164 165 sun3_put_context(oldctx); 166 167 } 168 169 /* Flush a single TLB page. In this case, we're limited to flushing a 170 single PMEG */ 171 static inline void flush_tlb_page (struct vm_area_struct *vma, 172 unsigned long addr) 173 { 174 unsigned char oldctx; 175 unsigned char i; 176 177 oldctx = sun3_get_context(); 178 sun3_put_context(vma->vm_mm->context); 179 addr &= ~SUN3_PMEG_MASK; 180 if((i = sun3_get_segmap(addr)) != SUN3_INVALID_PMEG) 181 { 182 pmeg_alloc[i] = 0; 183 pmeg_ctx[i] = 0; 184 pmeg_vaddr[i] = 0; 185 sun3_put_segmap (addr, SUN3_INVALID_PMEG); 186 } 187 sun3_put_context(oldctx); 188 189 } 190 /* Flush a range of pages from TLB. */ 191 192 static inline void flush_tlb_range (struct vm_area_struct *vma, 193 unsigned long start, unsigned long end) 194 { 195 struct mm_struct *mm = vma->vm_mm; 196 unsigned char seg, oldctx; 197 198 start &= ~SUN3_PMEG_MASK; 199 200 oldctx = sun3_get_context(); 201 sun3_put_context(mm->context); 202 203 while(start < end) 204 { 205 if((seg = sun3_get_segmap(start)) == SUN3_INVALID_PMEG) 206 goto next; 207 if(pmeg_ctx[seg] == mm->context) { 208 pmeg_alloc[seg] = 0; 209 pmeg_ctx[seg] = 0; 210 pmeg_vaddr[seg] = 0; 211 } 212 sun3_put_segmap(start, SUN3_INVALID_PMEG); 213 next: 214 start += SUN3_PMEG_SIZE; 215 } 216 } 217 218 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end) 219 { 220 flush_tlb_all(); 221 } 222 223 /* Flush kernel page from TLB. */ 224 static inline void flush_tlb_kernel_page (unsigned long addr) 225 { 226 sun3_put_segmap (addr & ~(SUN3_PMEG_SIZE - 1), SUN3_INVALID_PMEG); 227 } 228 229 #endif 230 231 #else /* !CONFIG_MMU */ 232 233 /* 234 * flush all user-space atc entries. 235 */ 236 static inline void __flush_tlb(void) 237 { 238 BUG(); 239 } 240 241 static inline void __flush_tlb_one(unsigned long addr) 242 { 243 BUG(); 244 } 245 246 #define flush_tlb() __flush_tlb() 247 248 /* 249 * flush all atc entries (both kernel and user-space entries). 250 */ 251 static inline void flush_tlb_all(void) 252 { 253 BUG(); 254 } 255 256 static inline void flush_tlb_mm(struct mm_struct *mm) 257 { 258 BUG(); 259 } 260 261 static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr) 262 { 263 BUG(); 264 } 265 266 static inline void flush_tlb_range(struct mm_struct *mm, 267 unsigned long start, unsigned long end) 268 { 269 BUG(); 270 } 271 272 static inline void flush_tlb_kernel_page(unsigned long addr) 273 { 274 BUG(); 275 } 276 277 #endif /* CONFIG_MMU */ 278 279 #endif /* _M68K_TLBFLUSH_H */ 280