KernelLand/Kernel/arch/armv6/mm_virt.c

   1 /*
   2  * Acess2
   3  *
   4  * ARM7 Virtual Memory Manager
   5  * - arch/arm7/mm_virt.c
   6  */
   7 #define DEBUG   0
   8 #include <acess.h>
   9 #include <mm_virt.h>
  10 #include <hal_proc.h>
  11
  12 #define TRACE_MAPS      0
  13
  14 #define AP_KRW_ONLY     1       // Kernel page
  15 #define AP_KRO_ONLY     5       // Kernel RO page
  16 #define AP_RW_BOTH      3       // Standard RW
  17 #define AP_RO_BOTH      7       // COW Page
  18 #define AP_RO_USER      2       // User RO Page
  19 #define PADDR_MASK_LVL1 0xFFFFFC00
  20
  21 // === IMPORTS ===
  22 extern Uint32   kernel_table0[];
  23
  24 // === TYPES ===
  25 typedef struct
  26 {
  27         tPAddr  PhysAddr;
  28         Uint8   Size;
  29         Uint8   Domain;
  30         BOOL    bExecutable;
  31         BOOL    bGlobal;
  32         BOOL    bShared;
  33          int    AP;
  34 } tMM_PageInfo;
  35
  36 //#define FRACTAL(table1, addr) ((table1)[ (0xFF8/4*1024) + ((addr)>>20)])
  37 #define FRACTAL(table1, addr)   ((table1)[ (0xFF8/4*1024) + ((addr)>>22)])
  38 #define USRFRACTAL(addr)        (*((Uint32*)(0x7FDFF000) + ((addr)>>22)))
  39 #define TLBIALL()       __asm__ __volatile__ ("mcr p15, 0, %0, c8, c7, 0" : : "r" (0))
  40 #define TLBIMVA(addr)   __asm__ __volatile__ ("mcr p15, 0, %0, c8, c7, 1" : : "r" (((addr)&~0xFFF)|1):"memory")
  41 #define DCCMVAC(addr)   __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 1" : : "r" ((addr)&~0xFFF))
  42
  43 // === PROTOTYPES ===
  44 void    MM_int_GetTables(tVAddr VAddr, Uint32 **Table0, Uint32 **Table1);
  45  int    MM_int_AllocateCoarse(tVAddr VAddr, int Domain);
  46  int    MM_int_SetPageInfo(tVAddr VAddr, tMM_PageInfo *pi);
  47  int    MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi);
  48 tVAddr  MM_NewUserStack(void);
  49 tPAddr  MM_AllocateZero(tVAddr VAddr);
  50 tPAddr  MM_AllocateRootTable(void);
  51 void    MM_int_CloneTable(Uint32 *DestEnt, int Table);
  52 tPAddr  MM_Clone(void);
  53 tVAddr  MM_NewKStack(int bGlobal);
  54 void    MM_int_DumpTableEnt(tVAddr Start, size_t Len, tMM_PageInfo *Info);
  55 //void  MM_DumpTables(tVAddr Start, tVAddr End);
  56 void    MM_PageFault(Uint32 PC, Uint32 Addr, Uint32 DFSR, int bPrefetch);
  57
  58 // === GLOBALS ===
  59 tPAddr  giMM_ZeroPage;
  60
  61 // === CODE ===
  62 int MM_InitialiseVirtual(void)
  63 {
  64         return 0;
  65 }
  66
  67 void MM_int_GetTables(tVAddr VAddr, Uint32 **Table0, Uint32 **Table1)
  68 {
  69         if(VAddr & 0x80000000) {
  70                 *Table0 = (void*)&kernel_table0;        // Level 0
  71                 *Table1 = (void*)MM_TABLE1KERN; // Level 1
  72         }
  73         else {
  74                 *Table0 = (void*)MM_TABLE0USER;
  75                 *Table1 = (void*)MM_TABLE1USER;
  76         }
  77 }
  78
  79 int MM_int_AllocateCoarse(tVAddr VAddr, int Domain)
  80 {
  81         Uint32  *table0, *table1;
  82         Uint32  *desc;
  83         tPAddr  paddr;
  84
  85         ENTER("xVAddr iDomain", VAddr, Domain);
  86
  87         MM_int_GetTables(VAddr, &table0, &table1);
  88
  89         VAddr &= ~(0x400000-1); // 4MiB per "block", 1 Page
  90
  91         desc = &table0[ VAddr>>20];
  92         LOG("desc = %p", desc);
  93
  94         // table0: 4 bytes = 1 MiB
  95
  96         LOG("desc[0] = %x", desc[0]);
  97         LOG("desc[1] = %x", desc[1]);
  98         LOG("desc[2] = %x", desc[2]);
  99         LOG("desc[3] = %x", desc[3]);
 100
 101         if( (desc[0] & 3) != 0 || (desc[1] & 3) != 0
 102          || (desc[2] & 3) != 0 || (desc[3] & 3) != 0 )
 103         {
 104                 // Error?
 105                 LEAVE('i', 1);
 106                 return 1;
 107         }
 108
 109         paddr = MM_AllocPhys();
 110         if( !paddr )
 111         {
 112                 // Error
 113                 LEAVE('i', 2);
 114                 return 2;
 115         }
 116
 117         *desc = paddr | (Domain << 5) | 1;
 118         desc[1] = desc[0] + 0x400;
 119         desc[2] = desc[0] + 0x800;
 120         desc[3] = desc[0] + 0xC00;
 121
 122         if( VAddr < 0x80000000 ) {
 123                 USRFRACTAL(VAddr) = paddr | 0x13;
 124         }
 125         else {
 126                 FRACTAL(table1, VAddr) = paddr | 0x13;
 127         }
 128
 129         // TLBIALL
 130         TLBIALL();
 131
 132         memset( (void*)&table1[ (VAddr >> 12) & ~(1024-1) ], 0, 0x1000 );
 133
 134         LEAVE('i', 0);
 135         return 0;
 136 }
 137
 138 int MM_int_SetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
 139 {
 140         Uint32  *table0, *table1;
 141         Uint32  *desc;
 142
 143         ENTER("pVAddr ppi", VAddr, pi);
 144
 145         MM_int_GetTables(VAddr, &table0, &table1);
 146
 147         desc = &table0[ VAddr >> 20 ];
 148         LOG("desc = %p", desc);
 149
 150         switch(pi->Size)
 151         {
 152         case 12:        // Small Page
 153         case 16:        // Large Page
 154                 LOG("Page");
 155                 if( (*desc & 3) == 0 ) {
 156                         MM_int_AllocateCoarse( VAddr, pi->Domain );
 157                 }
 158                 desc = &table1[ VAddr >> 12 ];
 159                 LOG("desc (2) = %p", desc);
 160                 if( pi->Size == 12 )
 161                 {
 162                         // Small page
 163                         // - Error if overwriting a large page
 164                         if( (*desc & 3) == 1 )  LEAVE_RET('i', 1);
 165                         if( pi->PhysAddr == 0 ) {
 166                                 *desc = 0;
 167                                 TLBIMVA( VAddr );
 168                                 DCCMVAC( (tVAddr) desc );
 169 //                              #warning "HACK: TLBIALL"
 170 //                              TLBIALL();
 171                                 LEAVE('i', 0);
 172                                 return 0;
 173                         }
 174
 175                         *desc = (pi->PhysAddr & 0xFFFFF000) | 2;
 176                         if(!pi->bExecutable)    *desc |= 1;     // XN
 177                         if(!pi->bGlobal)        *desc |= 1 << 11;       // nG
 178                         if( pi->bShared)        *desc |= 1 << 10;       // S
 179                         *desc |= (pi->AP & 3) << 4;     // AP
 180                         *desc |= ((pi->AP >> 2) & 1) << 9;      // APX
 181                         TLBIMVA( VAddr );
 182 //                      #warning "HACK: TLBIALL"
 183 //                      TLBIALL();
 184                         DCCMVAC( (tVAddr) desc );
 185                         LEAVE('i', 0);
 186                         return 0;
 187                 }
 188                 else
 189                 {
 190                         // Large page
 191                         Log_Warning("MMVirt", "TODO: Implement large pages in MM_int_SetPageInfo");
 192                 }
 193                 break;
 194         case 20:        // Section or unmapped
 195                 Log_Warning("MMVirt", "TODO: Implement sections in MM_int_SetPageInfo");
 196                 break;
 197         case 24:        // Supersection
 198                 // Error if not aligned
 199                 if( VAddr & 0xFFFFFF ) {
 200                         LEAVE('i', 1);
 201                         return 1;
 202                 }
 203                 if( (*desc & 3) == 0 || ((*desc & 3) == 2 && (*desc & (1 << 18)))  )
 204                 {
 205                         if( pi->PhysAddr == 0 ) {
 206                                 *desc = 0;
 207                         }
 208                         else {
 209                                 // Apply
 210                                 *desc = pi->PhysAddr & 0xFF000000;
 211 //                              *desc |= ((pi->PhysAddr >> 32) & 0xF) << 20;
 212 //                              *desc |= ((pi->PhysAddr >> 36) & 0x7) << 5;
 213                                 *desc |= 2 | (1 << 18);
 214                         }
 215                         // TODO: Apply to all entries
 216                         Log_Warning("MMVirt", "TODO: Apply changes to all entries of supersections");
 217                         LEAVE('i', 0);
 218                         return 0;
 219                 }
 220                 // TODO: What here?
 221                 Log_Warning("MMVirt", "TODO: 24-bit not on supersection?");
 222                 LEAVE('i', 1);
 223                 return 1;
 224         }
 225
 226         LEAVE('i', 1);
 227         return 1;
 228 }
 229
 230 int MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
 231 {
 232         Uint32  *table0, *table1;
 233         Uint32  desc;
 234
 235 //      LogF("MM_int_GetPageInfo: VAddr=%p, pi=%p\n", VAddr, pi);
 236
 237         MM_int_GetTables(VAddr, &table0, &table1);
 238
 239         desc = table0[ VAddr >> 20 ];
 240
 241 //      if( VAddr > 0x90000000)
 242 //              LOG("table0 desc(%p) = %x", &table0[ VAddr >> 20 ], desc);
 243
 244         pi->bExecutable = 1;
 245         pi->bGlobal = 0;
 246         pi->bShared = 0;
 247         pi->AP = 0;
 248
 249         switch( (desc & 3) )
 250         {
 251         // 0: Unmapped
 252         case 0:
 253                 pi->PhysAddr = 0;
 254                 pi->Size = 20;
 255                 pi->Domain = 0;
 256                 return 1;
 257
 258         // 1: Coarse page table
 259         case 1:
 260                 // Domain from top level table
 261                 pi->Domain = (desc >> 5) & 7;
 262                 // Get next level
 263                 desc = table1[ VAddr >> 12 ];
 264 //              LOG("table1 desc(%p) = %x", &table1[ VAddr >> 12 ], desc);
 265                 switch( desc & 3 )
 266                 {
 267                 // 0: Unmapped
 268                 case 0:
 269                         pi->Size = 12;
 270                         return 1;
 271                 // 1: Large Page (64KiB)
 272                 case 1:
 273                         pi->Size = 16;
 274                         pi->PhysAddr = desc & 0xFFFF0000;
 275                         pi->AP = ((desc >> 4) & 3) | (((desc >> 9) & 1) << 2);
 276                         pi->bExecutable = !(desc & 0x8000);
 277                         pi->bShared = (desc >> 10) & 1;
 278                         return 0;
 279                 // 2/3: Small page
 280                 case 2:
 281                 case 3:
 282                         pi->Size = 12;
 283                         pi->PhysAddr = desc & 0xFFFFF000;
 284                         pi->bExecutable = !(desc & 1);
 285                         pi->bGlobal = !(desc >> 11);
 286                         pi->bShared = (desc >> 10) & 1;
 287                         pi->AP = ((desc >> 4) & 3) | (((desc >> 9) & 1) << 2);
 288                         return 0;
 289                 }
 290                 return 1;
 291
 292         // 2: Section (or Supersection)
 293         case 2:
 294                 if( desc & (1 << 18) ) {
 295                         // Supersection
 296                         pi->PhysAddr = desc & 0xFF000000;
 297                         pi->PhysAddr |= (Uint64)((desc >> 20) & 0xF) << 32;
 298                         pi->PhysAddr |= (Uint64)((desc >> 5) & 0x7) << 36;
 299                         pi->Size = 24;
 300                         pi->Domain = 0; // Supersections default to zero
 301                         pi->AP = ((desc >> 10) & 3) | (((desc >> 15) & 1) << 2);
 302                         return 0;
 303                 }
 304
 305                 // Section
 306                 pi->PhysAddr = desc & 0xFFF80000;
 307                 pi->Size = 20;
 308                 pi->Domain = (desc >> 5) & 7;
 309                 pi->AP = ((desc >> 10) & 3) | (((desc >> 15) & 1) << 2);
 310                 return 0;
 311
 312         // 3: Reserved (invalid)
 313         case 3:
 314                 pi->PhysAddr = 0;
 315                 pi->Size = 20;
 316                 pi->Domain = 0;
 317                 return 2;
 318         }
 319         return 2;
 320 }
 321
 322 // --- Exports ---
 323 tPAddr MM_GetPhysAddr(const void *Ptr)
 324 {
 325         tVAddr  VAddr = (tPAddr)Ptr;
 326         tMM_PageInfo    pi;
 327         if( MM_int_GetPageInfo(VAddr, &pi) )
 328                 return 0;
 329         return pi.PhysAddr | (VAddr & ((1 << pi.Size)-1));
 330 }
 331
 332 Uint MM_GetFlags(tVAddr VAddr)
 333 {
 334         tMM_PageInfo    pi;
 335          int    ret;
 336
 337         if( MM_int_GetPageInfo(VAddr, &pi) )
 338                 return 0;
 339
 340         ret = 0;
 341
 342         switch(pi.AP)
 343         {
 344         case 0:
 345                 break;
 346         case AP_KRW_ONLY:
 347                 ret |= MM_PFLAG_KERNEL;
 348                 break;
 349         case AP_KRO_ONLY:
 350                 ret |= MM_PFLAG_KERNEL|MM_PFLAG_RO;
 351                 break;
 352         case AP_RW_BOTH:
 353                 break;
 354         case AP_RO_BOTH:
 355                 ret |= MM_PFLAG_COW;
 356                 break;
 357         case AP_RO_USER:
 358                 ret |= MM_PFLAG_RO;
 359                 break;
 360         }
 361
 362         if( pi.bExecutable )    ret |= MM_PFLAG_EXEC;
 363         return ret;
 364 }
 365
 366 void MM_SetFlags(tVAddr VAddr, Uint Flags, Uint Mask)
 367 {
 368         tMM_PageInfo    pi;
 369         Uint    curFlags;
 370
 371         if( MM_int_GetPageInfo(VAddr, &pi) )
 372                 return ;
 373
 374         curFlags = MM_GetFlags(VAddr);
 375         if( (curFlags & Mask) == Flags )
 376                 return ;
 377         curFlags &= ~Mask;
 378         curFlags |= Flags;
 379
 380         if( curFlags & MM_PFLAG_COW )
 381                 pi.AP = AP_RO_BOTH;
 382         else
 383         {
 384                 switch(curFlags & (MM_PFLAG_KERNEL|MM_PFLAG_RO) )
 385                 {
 386                 case 0:
 387                         pi.AP = AP_RW_BOTH;     break;
 388                 case MM_PFLAG_KERNEL:
 389                         pi.AP = AP_KRW_ONLY;    break;
 390                 case MM_PFLAG_RO:
 391                         pi.AP = AP_RO_USER;     break;
 392                 case MM_PFLAG_KERNEL|MM_PFLAG_RO:
 393                         pi.AP = AP_KRO_ONLY;    break;
 394                 }
 395         }
 396
 397         pi.bExecutable = !!(curFlags & MM_PFLAG_EXEC);
 398
 399         MM_int_SetPageInfo(VAddr, &pi);
 400 }
 401
 402 int MM_IsValidBuffer(tVAddr Addr, size_t Size)
 403 {
 404         tMM_PageInfo    pi;
 405          int    bUser = 0;
 406
 407         Size += Addr & (PAGE_SIZE-1);
 408         Addr &= ~(PAGE_SIZE-1);
 409
 410         if( MM_int_GetPageInfo(Addr, &pi) )     return 0;
 411         Addr += PAGE_SIZE;
 412
 413         if(pi.AP != AP_KRW_ONLY && pi.AP != AP_KRO_ONLY)
 414                 bUser = 1;
 415
 416         while( Size >= PAGE_SIZE )
 417         {
 418                 if( MM_int_GetPageInfo(Addr, &pi) )
 419                         return 0;
 420                 if(bUser && (pi.AP == AP_KRW_ONLY || pi.AP == AP_KRO_ONLY))
 421                         return 0;
 422                 Addr += PAGE_SIZE;
 423                 Size -= PAGE_SIZE;
 424         }
 425
 426         return 1;
 427 }
 428
 429 int MM_Map(tVAddr VAddr, tPAddr PAddr)
 430 {
 431         tMM_PageInfo    pi = {0};
 432         #if TRACE_MAPS
 433         Log("MM_Map %P=>%p", PAddr, VAddr);
 434         #endif
 435
 436         pi.PhysAddr = PAddr;
 437         pi.Size = 12;
 438         if(VAddr < USER_STACK_TOP)
 439                 pi.AP = AP_RW_BOTH;
 440         else
 441                 pi.AP = AP_KRW_ONLY;    // Kernel Read/Write
 442         pi.bExecutable = 1;
 443         if( MM_int_SetPageInfo(VAddr, &pi) ) {
 444 //              MM_DerefPhys(pi.PhysAddr);
 445                 return 0;
 446         }
 447         return pi.PhysAddr;
 448 }
 449
 450 tPAddr MM_Allocate(tVAddr VAddr)
 451 {
 452         tMM_PageInfo    pi = {0};
 453
 454         ENTER("pVAddr", VAddr);
 455
 456         pi.PhysAddr = MM_AllocPhys();
 457         if( pi.PhysAddr == 0 )  LEAVE_RET('i', 0);
 458         pi.Size = 12;
 459         if(VAddr < USER_STACK_TOP)
 460                 pi.AP = AP_RW_BOTH;
 461         else
 462                 pi.AP = AP_KRW_ONLY;
 463         pi.bExecutable = 0;
 464         if( MM_int_SetPageInfo(VAddr, &pi) ) {
 465                 MM_DerefPhys(pi.PhysAddr);
 466                 LEAVE('i', 0);
 467                 return 0;
 468         }
 469         LEAVE('x', pi.PhysAddr);
 470         return pi.PhysAddr;
 471 }
 472
 473 tPAddr MM_AllocateZero(tVAddr VAddr)
 474 {
 475         if( !giMM_ZeroPage ) {
 476                 giMM_ZeroPage = MM_Allocate(VAddr);
 477                 MM_RefPhys(giMM_ZeroPage);
 478                 memset((void*)VAddr, 0, PAGE_SIZE);
 479         }
 480         else {
 481                 MM_RefPhys(giMM_ZeroPage);
 482                 MM_Map(VAddr, giMM_ZeroPage);
 483         }
 484         MM_SetFlags(VAddr, MM_PFLAG_COW, MM_PFLAG_COW);
 485         return giMM_ZeroPage;
 486 }
 487
 488 void MM_Deallocate(tVAddr VAddr)
 489 {
 490         tMM_PageInfo    pi;
 491
 492         if( MM_int_GetPageInfo(VAddr, &pi) )    return ;
 493         if( pi.PhysAddr == 0 )  return;
 494         MM_DerefPhys(pi.PhysAddr);
 495
 496         pi.PhysAddr = 0;
 497         pi.AP = 0;
 498         pi.bExecutable = 0;
 499         MM_int_SetPageInfo(VAddr, &pi);
 500 }
 501
 502 tPAddr MM_AllocateRootTable(void)
 503 {
 504         tPAddr  ret;
 505
 506         ret = MM_AllocPhysRange(2, -1);
 507         if( ret & 0x1000 ) {
 508                 MM_DerefPhys(ret);
 509                 MM_DerefPhys(ret+0x1000);
 510                 ret = MM_AllocPhysRange(3, -1);
 511                 if( ret & 0x1000 ) {
 512                         MM_DerefPhys(ret);
 513                         ret += 0x1000;
 514 //                      Log("MM_AllocateRootTable: Second try not aligned, %P", ret);
 515                 }
 516                 else {
 517                         MM_DerefPhys(ret + 0x2000);
 518 //                      Log("MM_AllocateRootTable: Second try aligned, %P", ret);
 519                 }
 520         }
 521 //      else
 522 //              Log("MM_AllocateRootTable: Got it in one, %P", ret);
 523         return ret;
 524 }
 525
 526 void MM_int_CloneTable(Uint32 *DestEnt, int Table)
 527 {
 528         tPAddr  table;
 529         Uint32  *tmp_map;
 530         Uint32  *cur = (void*)MM_TABLE1USER;
 531 //      Uint32  *cur = &FRACTAL(MM_TABLE1USER,0);
 532          int    i;
 533
 534         table = MM_AllocPhys();
 535         if(!table)      return ;
 536
 537         cur += 256*Table;
 538
 539         tmp_map = MM_MapTemp(table);
 540
 541         for( i = 0; i < 1024; i ++ )
 542         {
 543 //              Log_Debug("MMVirt", "cur[%i] (%p) = %x", Table*256+i, &cur[Table*256+i], cur[Table*256+i]);
 544                 switch(cur[i] & 3)
 545                 {
 546                 case 0: tmp_map[i] = 0; break;
 547                 case 1:
 548                         tmp_map[i] = 0;
 549                         Log_Error("MMVirt", "TODO: Support large pages in MM_int_CloneTable (%p)", (Table*256+i)*0x1000);
 550                         // Large page?
 551                         break;
 552                 case 2:
 553                 case 3:
 554                         // Small page
 555                         // - If full RW
 556 //                      Debug("%p cur[%i] & 0x230 = 0x%x", Table*256*0x1000, i, cur[i] & 0x230);
 557                         if( (cur[i] & 0x230) == 0x010 )
 558                         {
 559                                 void    *dst, *src;
 560                                 tPAddr  newpage;
 561                                 newpage = MM_AllocPhys();
 562                                 src = (void*)( (Table*256+i)*0x1000 );
 563                                 dst = MM_MapTemp(newpage);
 564 //                              Debug("Taking a copy of kernel page %p (%P)", src, cur[i] & ~0xFFF);
 565                                 memcpy(dst, src, PAGE_SIZE);
 566                                 MM_FreeTemp( dst );
 567                                 tmp_map[i] = newpage | (cur[i] & 0xFFF);
 568                         }
 569                         else
 570                         {
 571                                 if( (cur[i] & 0x230) == 0x030 )
 572                                         cur[i] |= 0x200;        // Set to full RO (Full RO=COW, User RO = RO)
 573                                 tmp_map[i] = cur[i];
 574                                 MM_RefPhys( tmp_map[i] & ~0xFFF );
 575                         }
 576                         break;
 577                 }
 578         }
 579         MM_FreeTemp( tmp_map );
 580
 581         DestEnt[0] = table + 0*0x400 + 1;
 582         DestEnt[1] = table + 1*0x400 + 1;
 583         DestEnt[2] = table + 2*0x400 + 1;
 584         DestEnt[3] = table + 3*0x400 + 1;
 585 }
 586
 587 tPAddr MM_Clone(void)
 588 {
 589         tPAddr  ret;
 590         Uint32  *new_lvl1_1, *new_lvl1_2, *cur;
 591         Uint32  *tmp_map;
 592          int    i;
 593
 594 //      MM_DumpTables(0, KERNEL_BASE);
 595
 596         ret = MM_AllocateRootTable();
 597
 598         cur = (void*)MM_TABLE0USER;
 599         new_lvl1_1 = MM_MapTemp(ret);
 600         new_lvl1_2 = MM_MapTemp(ret+0x1000);
 601         tmp_map = new_lvl1_1;
 602         for( i = 0; i < 0x800-4; i ++ )
 603         {
 604                 // HACK! Ignore the original identity mapping
 605                 if( i == 0 && Threads_GetTID() == 0 ) {
 606                         tmp_map[0] = 0;
 607                         continue;
 608                 }
 609                 if( i == 0x400 )
 610                         tmp_map = &new_lvl1_2[-0x400];
 611                 switch( cur[i] & 3 )
 612                 {
 613                 case 0: tmp_map[i] = 0; break;
 614                 case 1:
 615                         MM_int_CloneTable(&tmp_map[i], i);
 616                         i += 3; // Tables are alocated in blocks of 4
 617                         break;
 618                 case 2:
 619                 case 3:
 620                         Log_Error("MMVirt", "TODO: Support Sections/Supersections in MM_Clone (i=%i)", i);
 621                         tmp_map[i] = 0;
 622                         break;
 623                 }
 624         }
 625
 626         // Allocate Fractal table
 627         {
 628                  int    j, num;
 629                 tPAddr  tmp = MM_AllocPhys();
 630                 Uint32  *table = MM_MapTemp(tmp);
 631                 Uint32  sp;
 632                 register Uint32 __SP asm("sp");
 633
 634                 // Map table to last 4MiB of user space
 635                 new_lvl1_2[0x3FC] = tmp + 0*0x400 + 1;
 636                 new_lvl1_2[0x3FD] = tmp + 1*0x400 + 1;
 637                 new_lvl1_2[0x3FE] = tmp + 2*0x400 + 1;
 638                 new_lvl1_2[0x3FF] = tmp + 3*0x400 + 1;
 639
 640                 tmp_map = new_lvl1_1;
 641                 for( j = 0; j < 512; j ++ )
 642                 {
 643                         if( j == 256 )
 644                                 tmp_map = &new_lvl1_2[-0x400];
 645                         if( (tmp_map[j*4] & 3) == 1 )
 646                         {
 647                                 table[j] = tmp_map[j*4] & PADDR_MASK_LVL1;// 0xFFFFFC00;
 648                                 table[j] |= 0x813;      // nG, Kernel Only, Small page, XN
 649                         }
 650                         else
 651                                 table[j] = 0;
 652                 }
 653                 // Fractal
 654                 table[j++] = (ret + 0x0000) | 0x813;
 655                 table[j++] = (ret + 0x1000) | 0x813;
 656                 // Nuke the rest
 657                 for(      ; j < 1024; j ++ )
 658                         table[j] = 0;
 659
 660                 // Get kernel stack bottom
 661                 sp = __SP & ~(MM_KSTACK_SIZE-1);
 662                 j = (sp / 0x1000) % 1024;
 663                 num = MM_KSTACK_SIZE/0x1000;
 664
 665 //              Log("num = %i, sp = %p, j = %i", num, sp, j);
 666
 667                 // Copy stack pages
 668                 for(; num--; j ++, sp += 0x1000)
 669                 {
 670                         tVAddr  page;
 671                         void    *tmp_page;
 672
 673                         page = MM_AllocPhys();
 674 //                      Log("page = %P", page);
 675                         table[j] = page | 0x813;
 676
 677                         tmp_page = MM_MapTemp(page);
 678                         memcpy(tmp_page, (void*)sp, 0x1000);
 679                         MM_FreeTemp( tmp_page );
 680                 }
 681
 682                 MM_FreeTemp( table );
 683         }
 684
 685         MM_FreeTemp( new_lvl1_1 );
 686         MM_FreeTemp( new_lvl1_2 );
 687
 688 //      Log("MM_Clone: ret = %P", ret);
 689
 690         return ret;
 691 }
 692
 693 void MM_ClearUser(void)
 694 {
 695          int    i, j;
 696         const int       user_table_count = USER_STACK_TOP / (256*0x1000);
 697         Uint32  *cur = (void*)MM_TABLE0USER;
 698         Uint32  *tab;
 699
 700 //      MM_DumpTables(0, 0x80000000);
 701
 702 //      Log("user_table_count = %i (as opposed to %i)", user_table_count, 0x800-4);
 703
 704         for( i = 0; i < user_table_count; i ++ )
 705         {
 706                 switch( cur[i] & 3 )
 707                 {
 708                 case 0: break;  // Already unmapped
 709                 case 1: // Sub pages
 710                         tab = (void*)(MM_TABLE1USER + i*256*sizeof(Uint32));
 711                         for( j = 0; j < 1024; j ++ )
 712                         {
 713                                 switch( tab[j] & 3 )
 714                                 {
 715                                 case 0: break;  // Unmapped
 716                                 case 1:
 717                                         Log_Error("MMVirt", "TODO: Support large pages in MM_ClearUser");
 718                                         break;
 719                                 case 2:
 720                                 case 3:
 721                                         MM_DerefPhys( tab[j] & ~(PAGE_SIZE-1) );
 722                                         break;
 723                                 }
 724                         }
 725                         MM_DerefPhys( cur[i] & ~(PAGE_SIZE-1) );
 726                         cur[i+0] = 0;
 727                         cur[i+1] = 0;
 728                         cur[i+2] = 0;
 729                         i += 3;
 730                         break;
 731                 case 2:
 732                 case 3:
 733                         Log_Error("MMVirt", "TODO: Implement sections/supersections in MM_ClearUser");
 734                         break;
 735                 }
 736                 cur[i] = 0;
 737         }
 738
 739         // Final block of 4 tables are KStack
 740         i = 0x800 - 4;
 741
 742         // Clear out unused stacks
 743         {
 744                 register Uint32 __SP asm("sp");
 745                  int    cur_stack_base = ((__SP & ~(MM_KSTACK_SIZE-1)) / PAGE_SIZE) % 1024;
 746
 747                 tab = (void*)(MM_TABLE1USER + i*256*sizeof(Uint32));
 748
 749                 // First 512 is the Table1 mapping + 2 for Table0 mapping
 750                 for( j = 512+2; j < 1024; j ++ )
 751                 {
 752                         // Skip current stack
 753                         if( j == cur_stack_base ) {
 754                                 j += (MM_KSTACK_SIZE / PAGE_SIZE) - 1;
 755                                 continue ;
 756                         }
 757                         if( !(tab[j] & 3) )     continue;
 758                         ASSERT( (tab[j] & 3) == 2 );
 759                         MM_DerefPhys( tab[j] & ~(PAGE_SIZE) );
 760                         tab[j] = 0;
 761                 }
 762         }
 763
 764
 765 //      MM_DumpTables(0, 0x80000000);
 766 }
 767
 768 void *MM_MapTemp(tPAddr PAddr)
 769 {
 770         tVAddr  ret;
 771         tMM_PageInfo    pi;
 772
 773         for( ret = MM_TMPMAP_BASE; ret < MM_TMPMAP_END - PAGE_SIZE; ret += PAGE_SIZE )
 774         {
 775                 if( MM_int_GetPageInfo(ret, &pi) == 0 )
 776                         continue;
 777
 778 //              Log("MapTemp %P at %p by %p", PAddr, ret, __builtin_return_address(0));
 779                 MM_RefPhys(PAddr);      // Counter the MM_Deallocate in FreeTemp
 780                 MM_Map(ret, PAddr);
 781
 782                 return (void*)ret;
 783         }
 784         Log_Warning("MMVirt", "MM_MapTemp: All slots taken");
 785         return 0;
 786 }
 787
 788 void MM_FreeTemp(void *Ptr)
 789 {
 790         tVAddr  VAddr = (tVAddr)Ptr;
 791         if( VAddr < MM_TMPMAP_BASE || VAddr >= MM_TMPMAP_END ) {
 792                 Log_Warning("MMVirt", "MM_FreeTemp: Passed an addr not from MM_MapTemp (%p)", VAddr);
 793                 return ;
 794         }
 795
 796         MM_Deallocate(VAddr);
 797 }
 798
 799 tVAddr MM_MapHWPages(tPAddr PAddr, Uint NPages)
 800 {
 801         tVAddr  ret;
 802          int    i;
 803         tMM_PageInfo    pi;
 804
 805         ENTER("xPAddr iNPages", PAddr, NPages);
 806
 807         // Scan for a location
 808         for( ret = MM_HWMAP_BASE; ret < MM_HWMAP_END - NPages * PAGE_SIZE; ret += PAGE_SIZE )
 809         {
 810 //              LOG("checking %p", ret);
 811                 // Check if there is `NPages` free pages
 812                 for( i = 0; i < NPages; i ++ )
 813                 {
 814                         if( MM_int_GetPageInfo(ret + i*PAGE_SIZE, &pi) == 0 )
 815                                 break;
 816                 }
 817                 // Nope, jump to after the used page found and try again
 818 //              LOG("i = %i, ==? %i", i, NPages);
 819                 if( i != NPages ) {
 820                         ret += i * PAGE_SIZE;
 821                         continue ;
 822                 }
 823
 824                 // Map the pages
 825                 for( i = 0; i < NPages; i ++ )
 826                         MM_Map(ret+i*PAGE_SIZE, PAddr+i*PAGE_SIZE);
 827                 // and return
 828                 LEAVE('p', ret);
 829                 return ret;
 830         }
 831         Log_Warning("MMVirt", "MM_MapHWPages: No space for a %i page block", NPages);
 832         LEAVE('p', 0);
 833         return 0;
 834 }
 835
 836 tVAddr MM_AllocDMA(int Pages, int MaxBits, tPAddr *PAddr)
 837 {
 838         tPAddr  phys;
 839         tVAddr  ret;
 840
 841         phys = MM_AllocPhysRange(Pages, MaxBits);
 842         if(!phys) {
 843                 Log_Warning("MMVirt", "No space left for a %i page block (MM_AllocDMA)", Pages);
 844                 return 0;
 845         }
 846
 847         ret = MM_MapHWPages(phys, Pages);
 848         *PAddr = phys;
 849
 850         return ret;
 851 }
 852
 853 void MM_UnmapHWPages(tVAddr Vaddr, Uint Number)
 854 {
 855         Log_Error("MMVirt", "TODO: Implement MM_UnmapHWPages");
 856 }
 857
 858 tVAddr MM_NewKStack(int bShared)
 859 {
 860         tVAddr  min_addr, max_addr;
 861         tVAddr  addr, ofs;
 862
 863         if( bShared ) {
 864                 min_addr = MM_GLOBALSTACKS;
 865                 max_addr = MM_GLOBALSTACKS_END;
 866         }
 867         else {
 868                 min_addr = MM_KSTACK_BASE;
 869                 max_addr = MM_KSTACK_END;
 870         }
 871
 872         // Locate a free slot
 873         for( addr = min_addr; addr < max_addr; addr += MM_KSTACK_SIZE )
 874         {
 875                 tMM_PageInfo    pi;
 876                 if( MM_int_GetPageInfo(addr+MM_KSTACK_SIZE-PAGE_SIZE, &pi) )    break;
 877         }
 878
 879         // Check for an error
 880         if(addr >= max_addr) {
 881                 return 0;
 882         }
 883
 884         // 1 guard page
 885         for( ofs = PAGE_SIZE; ofs < MM_KSTACK_SIZE; ofs += PAGE_SIZE )
 886         {
 887                 if( MM_Allocate(addr + ofs) == 0 )
 888                 {
 889                         while(ofs)
 890                         {
 891                                 ofs -= PAGE_SIZE;
 892                                 MM_Deallocate(addr + ofs);
 893                         }
 894                         Log_Warning("MMVirt", "MM_NewKStack: Unable to allocate");
 895                         return 0;
 896                 }
 897         }
 898         return addr + ofs;
 899 }
 900
 901 tVAddr MM_NewUserStack(void)
 902 {
 903         tVAddr  addr, ofs;
 904
 905         addr = USER_STACK_TOP - USER_STACK_SIZE;
 906         if( MM_GetPhysAddr( (void*)(addr + PAGE_SIZE) ) ) {
 907                 Log_Error("MMVirt", "Unable to create initial user stack, addr %p taken",
 908                         addr + PAGE_SIZE
 909                         );
 910                 return 0;
 911         }
 912
 913         // 1 guard page
 914         for( ofs = PAGE_SIZE; ofs < USER_STACK_SIZE; ofs += PAGE_SIZE )
 915         {
 916                 tPAddr  rv;
 917                 if(ofs >= USER_STACK_SIZE - USER_STACK_COMM)
 918                         rv = MM_Allocate(addr + ofs);
 919                 else
 920                         rv = MM_AllocateZero(addr + ofs);
 921                 if(rv == 0)
 922                 {
 923                         while(ofs)
 924                         {
 925                                 ofs -= PAGE_SIZE;
 926                                 MM_Deallocate(addr + ofs);
 927                         }
 928                         Log_Warning("MMVirt", "MM_NewUserStack: Unable to allocate");
 929                         return 0;
 930                 }
 931                 MM_SetFlags(addr+ofs, 0, MM_PFLAG_KERNEL);
 932         }
 933 //      Log("Return %p", addr + ofs);
 934 //      MM_DumpTables(0, 0x80000000);
 935         return addr + ofs;
 936 }
 937
 938 void MM_int_DumpTableEnt(tVAddr Start, size_t Len, tMM_PageInfo *Info)
 939 {
 940         if( giMM_ZeroPage && Info->PhysAddr == giMM_ZeroPage )
 941         {
 942                 Debug("%p => %8s - 0x%7x %i %x %s",
 943                         Start, "ZERO", Len,
 944                         Info->Domain, Info->AP,
 945                         Info->bGlobal ? "G" : "nG"
 946                         );
 947         }
 948         else
 949         {
 950                 Debug("%p => %8x - 0x%7x %i %x %s",
 951                         Start, Info->PhysAddr-Len, Len,
 952                         Info->Domain, Info->AP,
 953                         Info->bGlobal ? "G" : "nG"
 954                         );
 955         }
 956 }
 957
 958 void MM_DumpTables(tVAddr Start, tVAddr End)
 959 {
 960         tVAddr  range_start = 0, addr;
 961         tMM_PageInfo    pi, pi_old;
 962          int    i = 0, inRange=0;
 963
 964         memset(&pi_old, 0, sizeof(pi_old));
 965
 966         Debug("Page Table Dump (%p to %p):", Start, End);
 967         range_start = Start;
 968         for( addr = Start; i == 0 || (addr && addr < End); i = 1 )
 969         {
 970                  int    rv;
 971 //              Log("addr = %p", addr);
 972                 rv = MM_int_GetPageInfo(addr, &pi);
 973                 if( rv
 974                  || pi.Size != pi_old.Size
 975                  || pi.Domain != pi_old.Domain
 976                  || pi.AP != pi_old.AP
 977                  || pi.bGlobal != pi_old.bGlobal
 978                  || pi_old.PhysAddr != pi.PhysAddr )
 979                 {
 980                         if(inRange) {
 981                                 MM_int_DumpTableEnt(range_start, addr - range_start, &pi_old);
 982                         }
 983                         addr &= ~((1 << pi.Size)-1);
 984                         range_start = addr;
 985                 }
 986
 987                 pi_old = pi;
 988                 // Handle the zero page
 989                 if( !giMM_ZeroPage || pi_old.Size != 12 || pi_old.PhysAddr != giMM_ZeroPage )
 990                         pi_old.PhysAddr += 1 << pi_old.Size;
 991                 addr += 1 << pi_old.Size;
 992                 inRange = (rv == 0);
 993         }
 994         if(inRange)
 995                 MM_int_DumpTableEnt(range_start, addr - range_start, &pi);
 996         Debug("Done");
 997 }
 998
 999 // NOTE: Runs in abort context, not much difference, just a smaller stack
1000 void MM_PageFault(Uint32 PC, Uint32 Addr, Uint32 DFSR, int bPrefetch)
1001 {
1002          int    rv;
1003         tMM_PageInfo    pi;
1004
1005         rv = MM_int_GetPageInfo(Addr, &pi);
1006
1007         // Check for COW
1008         if( rv == 0 &&  pi.AP == AP_RO_BOTH )
1009         {
1010                 pi.AP = AP_RW_BOTH;
1011                 if( giMM_ZeroPage && pi.PhysAddr == giMM_ZeroPage )
1012                 {
1013                         tPAddr  newpage;
1014                         newpage = MM_AllocPhys();
1015                         if( !newpage ) {
1016                                 Log_Error("MMVirt", "Unable to allocate new page for COW of ZERO");
1017                                 for(;;);
1018                         }
1019
1020                         #if TRACE_COW
1021                         Log_Notice("MMVirt", "COW %p caused by %p, ZERO duped to %P (RefCnt(%i)--)", Addr, PC,
1022                                 newpage, MM_GetRefCount(pi.PhysAddr));
1023                         #endif
1024
1025                         MM_DerefPhys(pi.PhysAddr);
1026                         pi.PhysAddr = newpage;
1027                         pi.AP = AP_RW_BOTH;
1028                         MM_int_SetPageInfo(Addr, &pi);
1029
1030                         memset( (void*)(Addr & ~(PAGE_SIZE-1)), 0, PAGE_SIZE );
1031
1032                         return ;
1033                 }
1034                 else if( MM_GetRefCount(pi.PhysAddr) > 1 )
1035                 {
1036                         // Duplicate the page
1037                         tPAddr  newpage;
1038                         void    *dst, *src;
1039
1040                         newpage = MM_AllocPhys();
1041                         if(!newpage) {
1042                                 Log_Error("MMVirt", "Unable to allocate new page for COW");
1043                                 for(;;);
1044                         }
1045                         dst = MM_MapTemp(newpage);
1046                         src = (void*)(Addr & ~(PAGE_SIZE-1));
1047                         memcpy( dst, src, PAGE_SIZE );
1048                         MM_FreeTemp( dst );
1049
1050                         #if TRACE_COW
1051                         Log_Notice("MMVirt", "COW %p caused by %p, %P duped to %P (RefCnt(%i)--)", Addr, PC,
1052                                 pi.PhysAddr, newpage, MM_GetRefCount(pi.PhysAddr));
1053                         #endif
1054
1055                         MM_DerefPhys(pi.PhysAddr);
1056                         pi.PhysAddr = newpage;
1057                 }
1058                 #if TRACE_COW
1059                 else {
1060                         Log_Notice("MMVirt", "COW %p caused by %p, took last reference to %P",
1061                                 Addr, PC, pi.PhysAddr);
1062                 }
1063                 #endif
1064                 // Unset COW
1065                 pi.AP = AP_RW_BOTH;
1066                 MM_int_SetPageInfo(Addr, &pi);
1067                 return ;
1068         }
1069
1070
1071         Log_Error("MMVirt", "Code at %p accessed %p (DFSR = 0x%x)%s", PC, Addr, DFSR,
1072                 (bPrefetch ? " - Prefetch" : "")
1073                 );
1074         if( Addr < 0x80000000 )
1075                 MM_DumpTables(0, 0x80000000);
1076         else
1077                 MM_DumpTables(0x80000000, -1);
1078         for(;;);
1079 }
1080