1 /* 2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) 3 * Licensed under the GPL 4 */ 5 6 #include "linux/mm.h" 7 #include "asm/page.h" 8 #include "asm/pgalloc.h" 9 #include "asm/pgtable.h" 10 #include "asm/tlbflush.h" 11 #include "choose-mode.h" 12 #include "mode_kern.h" 13 #include "as-layout.h" 14 #include "tlb.h" 15 #include "mem.h" 16 #include "mem_user.h" 17 #include "os.h" 18 19 static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len, 20 unsigned int prot, struct host_vm_op *ops, int *index, 21 int last_filled, union mm_context *mmu, void **flush, 22 int (*do_ops)(union mm_context *, struct host_vm_op *, 23 int, int, void **)) 24 { 25 __u64 offset; 26 struct host_vm_op *last; 27 int fd, ret = 0; 28 29 fd = phys_mapping(phys, &offset); 30 if(*index != -1){ 31 last = &ops[*index]; 32 if((last->type == MMAP) && 33 (last->u.mmap.addr + last->u.mmap.len == virt) && 34 (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) && 35 (last->u.mmap.offset + last->u.mmap.len == offset)){ 36 last->u.mmap.len += len; 37 return 0; 38 } 39 } 40 41 if(*index == last_filled){ 42 ret = (*do_ops)(mmu, ops, last_filled, 0, flush); 43 *index = -1; 44 } 45 46 ops[++*index] = ((struct host_vm_op) { .type = MMAP, 47 .u = { .mmap = { 48 .addr = virt, 49 .len = len, 50 .prot = prot, 51 .fd = fd, 52 .offset = offset } 53 } }); 54 return ret; 55 } 56 57 static int add_munmap(unsigned long addr, unsigned long len, 58 struct host_vm_op *ops, int *index, int last_filled, 59 union mm_context *mmu, void **flush, 60 int (*do_ops)(union mm_context *, struct host_vm_op *, 61 int, int, void **)) 62 { 63 struct host_vm_op *last; 64 int ret = 0; 65 66 if(*index != -1){ 67 last = &ops[*index]; 68 if((last->type == MUNMAP) && 69 (last->u.munmap.addr + last->u.mmap.len == addr)){ 70 last->u.munmap.len += len; 71 return 0; 72 } 73 } 74 75 if(*index == last_filled){ 76 ret = (*do_ops)(mmu, ops, last_filled, 0, flush); 77 *index = -1; 78 } 79 80 ops[++*index] = ((struct host_vm_op) { .type = MUNMAP, 81 .u = { .munmap = { 82 .addr = addr, 83 .len = len } } }); 84 return ret; 85 } 86 87 static int add_mprotect(unsigned long addr, unsigned long len, 88 unsigned int prot, struct host_vm_op *ops, int *index, 89 int last_filled, union mm_context *mmu, void **flush, 90 int (*do_ops)(union mm_context *, struct host_vm_op *, 91 int, int, void **)) 92 { 93 struct host_vm_op *last; 94 int ret = 0; 95 96 if(*index != -1){ 97 last = &ops[*index]; 98 if((last->type == MPROTECT) && 99 (last->u.mprotect.addr + last->u.mprotect.len == addr) && 100 (last->u.mprotect.prot == prot)){ 101 last->u.mprotect.len += len; 102 return 0; 103 } 104 } 105 106 if(*index == last_filled){ 107 ret = (*do_ops)(mmu, ops, last_filled, 0, flush); 108 *index = -1; 109 } 110 111 ops[++*index] = ((struct host_vm_op) { .type = MPROTECT, 112 .u = { .mprotect = { 113 .addr = addr, 114 .len = len, 115 .prot = prot } } }); 116 return ret; 117 } 118 119 #define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1)) 120 121 static inline int update_pte_range(pmd_t *pmd, unsigned long addr, 122 unsigned long end, struct host_vm_op *ops, 123 int last_op, int *op_index, int force, 124 union mm_context *mmu, void **flush, 125 int (*do_ops)(union mm_context *, 126 struct host_vm_op *, int, int, 127 void **)) 128 { 129 pte_t *pte; 130 int r, w, x, prot, ret = 0; 131 132 pte = pte_offset_kernel(pmd, addr); 133 do { 134 r = pte_read(*pte); 135 w = pte_write(*pte); 136 x = pte_exec(*pte); 137 if (!pte_young(*pte)) { 138 r = 0; 139 w = 0; 140 } else if (!pte_dirty(*pte)) { 141 w = 0; 142 } 143 prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) | 144 (x ? UM_PROT_EXEC : 0)); 145 if(force || pte_newpage(*pte)){ 146 if(pte_present(*pte)) 147 ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK, 148 PAGE_SIZE, prot, ops, op_index, 149 last_op, mmu, flush, do_ops); 150 else ret = add_munmap(addr, PAGE_SIZE, ops, op_index, 151 last_op, mmu, flush, do_ops); 152 } 153 else if(pte_newprot(*pte)) 154 ret = add_mprotect(addr, PAGE_SIZE, prot, ops, op_index, 155 last_op, mmu, flush, do_ops); 156 *pte = pte_mkuptodate(*pte); 157 } while (pte++, addr += PAGE_SIZE, ((addr != end) && !ret)); 158 return ret; 159 } 160 161 static inline int update_pmd_range(pud_t *pud, unsigned long addr, 162 unsigned long end, struct host_vm_op *ops, 163 int last_op, int *op_index, int force, 164 union mm_context *mmu, void **flush, 165 int (*do_ops)(union mm_context *, 166 struct host_vm_op *, int, int, 167 void **)) 168 { 169 pmd_t *pmd; 170 unsigned long next; 171 int ret = 0; 172 173 pmd = pmd_offset(pud, addr); 174 do { 175 next = pmd_addr_end(addr, end); 176 if(!pmd_present(*pmd)){ 177 if(force || pmd_newpage(*pmd)){ 178 ret = add_munmap(addr, next - addr, ops, 179 op_index, last_op, mmu, 180 flush, do_ops); 181 pmd_mkuptodate(*pmd); 182 } 183 } 184 else ret = update_pte_range(pmd, addr, next, ops, last_op, 185 op_index, force, mmu, flush, 186 do_ops); 187 } while (pmd++, addr = next, ((addr != end) && !ret)); 188 return ret; 189 } 190 191 static inline int update_pud_range(pgd_t *pgd, unsigned long addr, 192 unsigned long end, struct host_vm_op *ops, 193 int last_op, int *op_index, int force, 194 union mm_context *mmu, void **flush, 195 int (*do_ops)(union mm_context *, 196 struct host_vm_op *, int, int, 197 void **)) 198 { 199 pud_t *pud; 200 unsigned long next; 201 int ret = 0; 202 203 pud = pud_offset(pgd, addr); 204 do { 205 next = pud_addr_end(addr, end); 206 if(!pud_present(*pud)){ 207 if(force || pud_newpage(*pud)){ 208 ret = add_munmap(addr, next - addr, ops, 209 op_index, last_op, mmu, 210 flush, do_ops); 211 pud_mkuptodate(*pud); 212 } 213 } 214 else ret = update_pmd_range(pud, addr, next, ops, last_op, 215 op_index, force, mmu, flush, 216 do_ops); 217 } while (pud++, addr = next, ((addr != end) && !ret)); 218 return ret; 219 } 220 221 void fix_range_common(struct mm_struct *mm, unsigned long start_addr, 222 unsigned long end_addr, int force, 223 int (*do_ops)(union mm_context *, struct host_vm_op *, 224 int, int, void **)) 225 { 226 pgd_t *pgd; 227 union mm_context *mmu = &mm->context; 228 struct host_vm_op ops[1]; 229 unsigned long addr = start_addr, next; 230 int ret = 0, last_op = ARRAY_SIZE(ops) - 1, op_index = -1; 231 void *flush = NULL; 232 233 ops[0].type = NONE; 234 pgd = pgd_offset(mm, addr); 235 do { 236 next = pgd_addr_end(addr, end_addr); 237 if(!pgd_present(*pgd)){ 238 if (force || pgd_newpage(*pgd)){ 239 ret = add_munmap(addr, next - addr, ops, 240 &op_index, last_op, mmu, 241 &flush, do_ops); 242 pgd_mkuptodate(*pgd); 243 } 244 } 245 else ret = update_pud_range(pgd, addr, next, ops, last_op, 246 &op_index, force, mmu, &flush, 247 do_ops); 248 } while (pgd++, addr = next, ((addr != end_addr) && !ret)); 249 250 if(!ret) 251 ret = (*do_ops)(mmu, ops, op_index, 1, &flush); 252 253 /* This is not an else because ret is modified above */ 254 if(ret) { 255 printk("fix_range_common: failed, killing current process\n"); 256 force_sig(SIGKILL, current); 257 } 258 } 259 260 int flush_tlb_kernel_range_common(unsigned long start, unsigned long end) 261 { 262 struct mm_struct *mm; 263 pgd_t *pgd; 264 pud_t *pud; 265 pmd_t *pmd; 266 pte_t *pte; 267 unsigned long addr, last; 268 int updated = 0, err; 269 270 mm = &init_mm; 271 for(addr = start; addr < end;){ 272 pgd = pgd_offset(mm, addr); 273 if(!pgd_present(*pgd)){ 274 last = ADD_ROUND(addr, PGDIR_SIZE); 275 if(last > end) 276 last = end; 277 if(pgd_newpage(*pgd)){ 278 updated = 1; 279 err = os_unmap_memory((void *) addr, 280 last - addr); 281 if(err < 0) 282 panic("munmap failed, errno = %d\n", 283 -err); 284 } 285 addr = last; 286 continue; 287 } 288 289 pud = pud_offset(pgd, addr); 290 if(!pud_present(*pud)){ 291 last = ADD_ROUND(addr, PUD_SIZE); 292 if(last > end) 293 last = end; 294 if(pud_newpage(*pud)){ 295 updated = 1; 296 err = os_unmap_memory((void *) addr, 297 last - addr); 298 if(err < 0) 299 panic("munmap failed, errno = %d\n", 300 -err); 301 } 302 addr = last; 303 continue; 304 } 305 306 pmd = pmd_offset(pud, addr); 307 if(!pmd_present(*pmd)){ 308 last = ADD_ROUND(addr, PMD_SIZE); 309 if(last > end) 310 last = end; 311 if(pmd_newpage(*pmd)){ 312 updated = 1; 313 err = os_unmap_memory((void *) addr, 314 last - addr); 315 if(err < 0) 316 panic("munmap failed, errno = %d\n", 317 -err); 318 } 319 addr = last; 320 continue; 321 } 322 323 pte = pte_offset_kernel(pmd, addr); 324 if(!pte_present(*pte) || pte_newpage(*pte)){ 325 updated = 1; 326 err = os_unmap_memory((void *) addr, 327 PAGE_SIZE); 328 if(err < 0) 329 panic("munmap failed, errno = %d\n", 330 -err); 331 if(pte_present(*pte)) 332 map_memory(addr, 333 pte_val(*pte) & PAGE_MASK, 334 PAGE_SIZE, 1, 1, 1); 335 } 336 else if(pte_newprot(*pte)){ 337 updated = 1; 338 os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1); 339 } 340 addr += PAGE_SIZE; 341 } 342 return(updated); 343 } 344 345 pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address) 346 { 347 return(pgd_offset(mm, address)); 348 } 349 350 pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address) 351 { 352 return(pud_offset(pgd, address)); 353 } 354 355 pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address) 356 { 357 return(pmd_offset(pud, address)); 358 } 359 360 pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address) 361 { 362 return(pte_offset_kernel(pmd, address)); 363 } 364 365 pte_t *addr_pte(struct task_struct *task, unsigned long addr) 366 { 367 pgd_t *pgd = pgd_offset(task->mm, addr); 368 pud_t *pud = pud_offset(pgd, addr); 369 pmd_t *pmd = pmd_offset(pud, addr); 370 371 return(pte_offset_map(pmd, addr)); 372 } 373 374 void flush_tlb_all(void) 375 { 376 flush_tlb_mm(current->mm); 377 } 378 379 void flush_tlb_kernel_range(unsigned long start, unsigned long end) 380 { 381 CHOOSE_MODE_PROC(flush_tlb_kernel_range_tt, 382 flush_tlb_kernel_range_common, start, end); 383 } 384 385 void flush_tlb_kernel_vm(void) 386 { 387 CHOOSE_MODE(flush_tlb_kernel_vm_tt(), 388 flush_tlb_kernel_range_common(start_vm, end_vm)); 389 } 390 391 void __flush_tlb_one(unsigned long addr) 392 { 393 CHOOSE_MODE_PROC(__flush_tlb_one_tt, __flush_tlb_one_skas, addr); 394 } 395 396 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 397 unsigned long end) 398 { 399 CHOOSE_MODE_PROC(flush_tlb_range_tt, flush_tlb_range_skas, vma, start, 400 end); 401 } 402 403 void flush_tlb_mm(struct mm_struct *mm) 404 { 405 CHOOSE_MODE_PROC(flush_tlb_mm_tt, flush_tlb_mm_skas, mm); 406 } 407 408 void force_flush_all(void) 409 { 410 CHOOSE_MODE(force_flush_all_tt(), force_flush_all_skas()); 411 } 412 413