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