1 /* 2 * linux/arch/m68k/mm/kmap.c 3 * 4 * Copyright (C) 1997 Roman Hodek 5 * 6 * 10/01/99 cleaned up the code and changing to the same interface 7 * used by other architectures /Roman Zippel 8 */ 9 10 #include <linux/module.h> 11 #include <linux/mm.h> 12 #include <linux/kernel.h> 13 #include <linux/string.h> 14 #include <linux/types.h> 15 #include <linux/slab.h> 16 #include <linux/vmalloc.h> 17 18 #include <asm/setup.h> 19 #include <asm/segment.h> 20 #include <asm/page.h> 21 #include <asm/pgalloc.h> 22 #include <asm/io.h> 23 #include <asm/system.h> 24 25 #undef DEBUG 26 27 #define PTRTREESIZE (256*1024) 28 29 /* 30 * For 040/060 we can use the virtual memory area like other architectures, 31 * but for 020/030 we want to use early termination page descriptor and we 32 * can't mix this with normal page descriptors, so we have to copy that code 33 * (mm/vmalloc.c) and return appriorate aligned addresses. 34 */ 35 36 #ifdef CPU_M68040_OR_M68060_ONLY 37 38 #define IO_SIZE PAGE_SIZE 39 40 static inline struct vm_struct *get_io_area(unsigned long size) 41 { 42 return get_vm_area(size, VM_IOREMAP); 43 } 44 45 46 static inline void free_io_area(void *addr) 47 { 48 vfree((void *)(PAGE_MASK & (unsigned long)addr)); 49 } 50 51 #else 52 53 #define IO_SIZE (256*1024) 54 55 static struct vm_struct *iolist; 56 57 static struct vm_struct *get_io_area(unsigned long size) 58 { 59 unsigned long addr; 60 struct vm_struct **p, *tmp, *area; 61 62 area = kmalloc(sizeof(*area), GFP_KERNEL); 63 if (!area) 64 return NULL; 65 addr = KMAP_START; 66 for (p = &iolist; (tmp = *p) ; p = &tmp->next) { 67 if (size + addr < (unsigned long)tmp->addr) 68 break; 69 if (addr > KMAP_END-size) { 70 kfree(area); 71 return NULL; 72 } 73 addr = tmp->size + (unsigned long)tmp->addr; 74 } 75 area->addr = (void *)addr; 76 area->size = size + IO_SIZE; 77 area->next = *p; 78 *p = area; 79 return area; 80 } 81 82 static inline void free_io_area(void *addr) 83 { 84 struct vm_struct **p, *tmp; 85 86 if (!addr) 87 return; 88 addr = (void *)((unsigned long)addr & -IO_SIZE); 89 for (p = &iolist ; (tmp = *p) ; p = &tmp->next) { 90 if (tmp->addr == addr) { 91 *p = tmp->next; 92 __iounmap(tmp->addr, tmp->size); 93 kfree(tmp); 94 return; 95 } 96 } 97 } 98 99 #endif 100 101 /* 102 * Map some physical address range into the kernel address space. 103 */ 104 /* Rewritten by Andreas Schwab to remove all races. */ 105 106 void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag) 107 { 108 struct vm_struct *area; 109 unsigned long virtaddr, retaddr; 110 long offset; 111 pgd_t *pgd_dir; 112 pmd_t *pmd_dir; 113 pte_t *pte_dir; 114 115 /* 116 * Don't allow mappings that wrap.. 117 */ 118 if (!size || physaddr > (unsigned long)(-size)) 119 return NULL; 120 121 #ifdef CONFIG_AMIGA 122 if (MACH_IS_AMIGA) { 123 if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000) 124 && (cacheflag == IOMAP_NOCACHE_SER)) 125 return (void __iomem *)physaddr; 126 } 127 #endif 128 129 #ifdef DEBUG 130 printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag); 131 #endif 132 /* 133 * Mappings have to be aligned 134 */ 135 offset = physaddr & (IO_SIZE - 1); 136 physaddr &= -IO_SIZE; 137 size = (size + offset + IO_SIZE - 1) & -IO_SIZE; 138 139 /* 140 * Ok, go for it.. 141 */ 142 area = get_io_area(size); 143 if (!area) 144 return NULL; 145 146 virtaddr = (unsigned long)area->addr; 147 retaddr = virtaddr + offset; 148 #ifdef DEBUG 149 printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr); 150 #endif 151 152 /* 153 * add cache and table flags to physical address 154 */ 155 if (CPU_IS_040_OR_060) { 156 physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 | 157 _PAGE_ACCESSED | _PAGE_DIRTY); 158 switch (cacheflag) { 159 case IOMAP_FULL_CACHING: 160 physaddr |= _PAGE_CACHE040; 161 break; 162 case IOMAP_NOCACHE_SER: 163 default: 164 physaddr |= _PAGE_NOCACHE_S; 165 break; 166 case IOMAP_NOCACHE_NONSER: 167 physaddr |= _PAGE_NOCACHE; 168 break; 169 case IOMAP_WRITETHROUGH: 170 physaddr |= _PAGE_CACHE040W; 171 break; 172 } 173 } else { 174 physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY); 175 switch (cacheflag) { 176 case IOMAP_NOCACHE_SER: 177 case IOMAP_NOCACHE_NONSER: 178 default: 179 physaddr |= _PAGE_NOCACHE030; 180 break; 181 case IOMAP_FULL_CACHING: 182 case IOMAP_WRITETHROUGH: 183 break; 184 } 185 } 186 187 while ((long)size > 0) { 188 #ifdef DEBUG 189 if (!(virtaddr & (PTRTREESIZE-1))) 190 printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr); 191 #endif 192 pgd_dir = pgd_offset_k(virtaddr); 193 pmd_dir = pmd_alloc(&init_mm, pgd_dir, virtaddr); 194 if (!pmd_dir) { 195 printk("ioremap: no mem for pmd_dir\n"); 196 return NULL; 197 } 198 199 if (CPU_IS_020_OR_030) { 200 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr; 201 physaddr += PTRTREESIZE; 202 virtaddr += PTRTREESIZE; 203 size -= PTRTREESIZE; 204 } else { 205 pte_dir = pte_alloc_kernel(pmd_dir, virtaddr); 206 if (!pte_dir) { 207 printk("ioremap: no mem for pte_dir\n"); 208 return NULL; 209 } 210 211 pte_val(*pte_dir) = physaddr; 212 virtaddr += PAGE_SIZE; 213 physaddr += PAGE_SIZE; 214 size -= PAGE_SIZE; 215 } 216 } 217 #ifdef DEBUG 218 printk("\n"); 219 #endif 220 flush_tlb_all(); 221 222 return (void __iomem *)retaddr; 223 } 224 EXPORT_SYMBOL(__ioremap); 225 226 /* 227 * Unmap a ioremap()ed region again 228 */ 229 void iounmap(void __iomem *addr) 230 { 231 #ifdef CONFIG_AMIGA 232 if ((!MACH_IS_AMIGA) || 233 (((unsigned long)addr < 0x40000000) || 234 ((unsigned long)addr > 0x60000000))) 235 free_io_area((__force void *)addr); 236 #else 237 free_io_area((__force void *)addr); 238 #endif 239 } 240 EXPORT_SYMBOL(iounmap); 241 242 /* 243 * __iounmap unmaps nearly everything, so be careful 244 * it doesn't free currently pointer/page tables anymore but it 245 * wans't used anyway and might be added later. 246 */ 247 void __iounmap(void *addr, unsigned long size) 248 { 249 unsigned long virtaddr = (unsigned long)addr; 250 pgd_t *pgd_dir; 251 pmd_t *pmd_dir; 252 pte_t *pte_dir; 253 254 while ((long)size > 0) { 255 pgd_dir = pgd_offset_k(virtaddr); 256 if (pgd_bad(*pgd_dir)) { 257 printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir)); 258 pgd_clear(pgd_dir); 259 return; 260 } 261 pmd_dir = pmd_offset(pgd_dir, virtaddr); 262 263 if (CPU_IS_020_OR_030) { 264 int pmd_off = (virtaddr/PTRTREESIZE) & 15; 265 int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK; 266 267 if (pmd_type == _PAGE_PRESENT) { 268 pmd_dir->pmd[pmd_off] = 0; 269 virtaddr += PTRTREESIZE; 270 size -= PTRTREESIZE; 271 continue; 272 } else if (pmd_type == 0) 273 continue; 274 } 275 276 if (pmd_bad(*pmd_dir)) { 277 printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir)); 278 pmd_clear(pmd_dir); 279 return; 280 } 281 pte_dir = pte_offset_kernel(pmd_dir, virtaddr); 282 283 pte_val(*pte_dir) = 0; 284 virtaddr += PAGE_SIZE; 285 size -= PAGE_SIZE; 286 } 287 288 flush_tlb_all(); 289 } 290 291 /* 292 * Set new cache mode for some kernel address space. 293 * The caller must push data for that range itself, if such data may already 294 * be in the cache. 295 */ 296 void kernel_set_cachemode(void *addr, unsigned long size, int cmode) 297 { 298 unsigned long virtaddr = (unsigned long)addr; 299 pgd_t *pgd_dir; 300 pmd_t *pmd_dir; 301 pte_t *pte_dir; 302 303 if (CPU_IS_040_OR_060) { 304 switch (cmode) { 305 case IOMAP_FULL_CACHING: 306 cmode = _PAGE_CACHE040; 307 break; 308 case IOMAP_NOCACHE_SER: 309 default: 310 cmode = _PAGE_NOCACHE_S; 311 break; 312 case IOMAP_NOCACHE_NONSER: 313 cmode = _PAGE_NOCACHE; 314 break; 315 case IOMAP_WRITETHROUGH: 316 cmode = _PAGE_CACHE040W; 317 break; 318 } 319 } else { 320 switch (cmode) { 321 case IOMAP_NOCACHE_SER: 322 case IOMAP_NOCACHE_NONSER: 323 default: 324 cmode = _PAGE_NOCACHE030; 325 break; 326 case IOMAP_FULL_CACHING: 327 case IOMAP_WRITETHROUGH: 328 cmode = 0; 329 } 330 } 331 332 while ((long)size > 0) { 333 pgd_dir = pgd_offset_k(virtaddr); 334 if (pgd_bad(*pgd_dir)) { 335 printk("iocachemode: bad pgd(%08lx)\n", pgd_val(*pgd_dir)); 336 pgd_clear(pgd_dir); 337 return; 338 } 339 pmd_dir = pmd_offset(pgd_dir, virtaddr); 340 341 if (CPU_IS_020_OR_030) { 342 int pmd_off = (virtaddr/PTRTREESIZE) & 15; 343 344 if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) { 345 pmd_dir->pmd[pmd_off] = (pmd_dir->pmd[pmd_off] & 346 _CACHEMASK040) | cmode; 347 virtaddr += PTRTREESIZE; 348 size -= PTRTREESIZE; 349 continue; 350 } 351 } 352 353 if (pmd_bad(*pmd_dir)) { 354 printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir)); 355 pmd_clear(pmd_dir); 356 return; 357 } 358 pte_dir = pte_offset_kernel(pmd_dir, virtaddr); 359 360 pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode; 361 virtaddr += PAGE_SIZE; 362 size -= PAGE_SIZE; 363 } 364 365 flush_tlb_all(); 366 } 367 EXPORT_SYMBOL(kernel_set_cachemode); 368