arch/um/kernel/tlb.c

   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
 223         if(!ret)
 224                 ret = (*do_ops)(mmu, ops, op_index, 1, &flush);
 225
 226         /* This is not an else because ret is modified above */
 227         if(ret) {
 228                 printk("fix_range_common: failed, killing current process\n");
 229                 force_sig(SIGKILL, current);
 230         }
 231 }
 232
 233 int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
 234 {
 235         struct mm_struct *mm;
 236         pgd_t *pgd;
 237         pud_t *pud;
 238         pmd_t *pmd;
 239         pte_t *pte;
 240         unsigned long addr, last;
 241         int updated = 0, err;
 242
 243         mm = &init_mm;
 244         for(addr = start; addr < end;){
 245                 pgd = pgd_offset(mm, addr);
 246                 if(!pgd_present(*pgd)){
 247                         last = ADD_ROUND(addr, PGDIR_SIZE);
 248                         if(last > end)
 249                                 last = end;
 250                         if(pgd_newpage(*pgd)){
 251                                 updated = 1;
 252                                 err = os_unmap_memory((void *) addr,
 253                                                       last - addr);
 254                                 if(err < 0)
 255                                         panic("munmap failed, errno = %d\n",
 256                                               -err);
 257                         }
 258                         addr = last;
 259                         continue;
 260                 }
 261
 262                 pud = pud_offset(pgd, addr);
 263                 if(!pud_present(*pud)){
 264                         last = ADD_ROUND(addr, PUD_SIZE);
 265                         if(last > end)
 266                                 last = end;
 267                         if(pud_newpage(*pud)){
 268                                 updated = 1;
 269                                 err = os_unmap_memory((void *) addr,
 270                                                       last - addr);
 271                                 if(err < 0)
 272                                         panic("munmap failed, errno = %d\n",
 273                                               -err);
 274                         }
 275                         addr = last;
 276                         continue;
 277                 }
 278
 279                 pmd = pmd_offset(pud, addr);
 280                 if(!pmd_present(*pmd)){
 281                         last = ADD_ROUND(addr, PMD_SIZE);
 282                         if(last > end)
 283                                 last = end;
 284                         if(pmd_newpage(*pmd)){
 285                                 updated = 1;
 286                                 err = os_unmap_memory((void *) addr,
 287                                                       last - addr);
 288                                 if(err < 0)
 289                                         panic("munmap failed, errno = %d\n",
 290                                               -err);
 291                         }
 292                         addr = last;
 293                         continue;
 294                 }
 295
 296                 pte = pte_offset_kernel(pmd, addr);
 297                 if(!pte_present(*pte) || pte_newpage(*pte)){
 298                         updated = 1;
 299                         err = os_unmap_memory((void *) addr,
 300                                               PAGE_SIZE);
 301                         if(err < 0)
 302                                 panic("munmap failed, errno = %d\n",
 303                                       -err);
 304                         if(pte_present(*pte))
 305                                 map_memory(addr,
 306                                            pte_val(*pte) & PAGE_MASK,
 307                                            PAGE_SIZE, 1, 1, 1);
 308                 }
 309                 else if(pte_newprot(*pte)){
 310                         updated = 1;
 311                         os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
 312                 }
 313                 addr += PAGE_SIZE;
 314         }
 315         return(updated);
 316 }
 317
 318 pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
 319 {
 320         return(pgd_offset(mm, address));
 321 }
 322
 323 pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
 324 {
 325         return(pud_offset(pgd, address));
 326 }
 327
 328 pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
 329 {
 330         return(pmd_offset(pud, address));
 331 }
 332
 333 pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
 334 {
 335         return(pte_offset_kernel(pmd, address));
 336 }
 337
 338 pte_t *addr_pte(struct task_struct *task, unsigned long addr)
 339 {
 340         pgd_t *pgd = pgd_offset(task->mm, addr);
 341         pud_t *pud = pud_offset(pgd, addr);
 342         pmd_t *pmd = pmd_offset(pud, addr);
 343
 344         return(pte_offset_map(pmd, addr));
 345 }
 346
 347 void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
 348 {
 349         address &= PAGE_MASK;
 350         flush_tlb_range(vma, address, address + PAGE_SIZE);
 351 }
 352
 353 void flush_tlb_all(void)
 354 {
 355         flush_tlb_mm(current->mm);
 356 }
 357
 358 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 359 {
 360         CHOOSE_MODE_PROC(flush_tlb_kernel_range_tt,
 361                          flush_tlb_kernel_range_common, start, end);
 362 }
 363
 364 void flush_tlb_kernel_vm(void)
 365 {
 366         CHOOSE_MODE(flush_tlb_kernel_vm_tt(),
 367                     flush_tlb_kernel_range_common(start_vm, end_vm));
 368 }
 369
 370 void __flush_tlb_one(unsigned long addr)
 371 {
 372         CHOOSE_MODE_PROC(__flush_tlb_one_tt, __flush_tlb_one_skas, addr);
 373 }
 374
 375 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 376                      unsigned long end)
 377 {
 378         CHOOSE_MODE_PROC(flush_tlb_range_tt, flush_tlb_range_skas, vma, start,
 379                          end);
 380 }
 381
 382 void flush_tlb_mm(struct mm_struct *mm)
 383 {
 384         CHOOSE_MODE_PROC(flush_tlb_mm_tt, flush_tlb_mm_skas, mm);
 385 }
 386
 387 void force_flush_all(void)
 388 {
 389         CHOOSE_MODE(force_flush_all_tt(), force_flush_all_skas());
 390 }
 391