4 * ARM7 Virtual Memory Manager
5 * - arch/arm7/mm_virt.c
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
22 extern Uint32 kernel_table0[];
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))
43 void MM_int_GetTables(tVAddr VAddr, Uint32 **Table0, Uint32 **Table1);
44 int MM_int_AllocateCoarse(tVAddr VAddr, int Domain);
45 int MM_int_SetPageInfo(tVAddr VAddr, tMM_PageInfo *pi);
46 int MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi);
47 tVAddr MM_NewUserStack(void);
48 tPAddr MM_AllocateZero(tVAddr VAddr);
49 tPAddr MM_AllocateRootTable(void);
50 void MM_int_CloneTable(Uint32 *DestEnt, int Table);
51 tPAddr MM_Clone(void);
52 tVAddr MM_NewKStack(int bGlobal);
53 void MM_int_DumpTableEnt(tVAddr Start, size_t Len, tMM_PageInfo *Info);
54 //void MM_DumpTables(tVAddr Start, tVAddr End);
55 void MM_PageFault(Uint32 PC, Uint32 Addr, Uint32 DFSR, int bPrefetch);
61 int MM_InitialiseVirtual(void)
66 void MM_int_GetTables(tVAddr VAddr, Uint32 **Table0, Uint32 **Table1)
68 if(VAddr & 0x80000000) {
69 *Table0 = (void*)&kernel_table0; // Level 0
70 *Table1 = (void*)MM_TABLE1KERN; // Level 1
73 *Table0 = (void*)MM_TABLE0USER;
74 *Table1 = (void*)MM_TABLE1USER;
78 int MM_int_AllocateCoarse(tVAddr VAddr, int Domain)
80 Uint32 *table0, *table1;
84 ENTER("xVAddr iDomain", VAddr, Domain);
86 MM_int_GetTables(VAddr, &table0, &table1);
88 VAddr &= ~(0x400000-1); // 4MiB per "block", 1 Page
90 desc = &table0[ VAddr>>20];
91 LOG("desc = %p", desc);
93 // table0: 4 bytes = 1 MiB
95 LOG("desc[0] = %x", desc[0]);
96 LOG("desc[1] = %x", desc[1]);
97 LOG("desc[2] = %x", desc[2]);
98 LOG("desc[3] = %x", desc[3]);
100 if( (desc[0] & 3) != 0 || (desc[1] & 3) != 0
101 || (desc[2] & 3) != 0 || (desc[3] & 3) != 0 )
108 paddr = MM_AllocPhys();
116 *desc = paddr | (Domain << 5) | 1;
117 desc[1] = desc[0] + 0x400;
118 desc[2] = desc[0] + 0x800;
119 desc[3] = desc[0] + 0xC00;
121 if( VAddr < 0x80000000 ) {
122 USRFRACTAL(VAddr) = paddr | 0x13;
125 FRACTAL(table1, VAddr) = paddr | 0x13;
131 memset( (void*)&table1[ (VAddr >> 12) & ~(1024-1) ], 0, 0x1000 );
137 int MM_int_SetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
139 Uint32 *table0, *table1;
142 ENTER("pVAddr ppi", VAddr, pi);
144 MM_int_GetTables(VAddr, &table0, &table1);
146 desc = &table0[ VAddr >> 20 ];
147 LOG("desc = %p", desc);
151 case 12: // Small Page
152 case 16: // Large Page
154 if( (*desc & 3) == 0 ) {
155 MM_int_AllocateCoarse( VAddr, pi->Domain );
157 desc = &table1[ VAddr >> 12 ];
158 LOG("desc (2) = %p", desc);
162 // - Error if overwriting a large page
163 if( (*desc & 3) == 1 ) LEAVE_RET('i', 1);
164 if( pi->PhysAddr == 0 ) {
166 TLBIMVA(VAddr & 0xFFFFF000);
171 *desc = (pi->PhysAddr & 0xFFFFF000) | 2;
172 if(!pi->bExecutable) *desc |= 1; // XN
173 if(!pi->bGlobal) *desc |= 1 << 11; // nG
174 if( pi->bShared) *desc |= 1 << 10; // S
175 *desc |= (pi->AP & 3) << 4; // AP
176 *desc |= ((pi->AP >> 2) & 1) << 9; // APX
177 TLBIMVA(VAddr & 0xFFFFF000);
184 Log_Warning("MMVirt", "TODO: Implement large pages in MM_int_SetPageInfo");
187 case 20: // Section or unmapped
188 Log_Warning("MMVirt", "TODO: Implement sections in MM_int_SetPageInfo");
190 case 24: // Supersection
191 // Error if not aligned
192 if( VAddr & 0xFFFFFF ) {
196 if( (*desc & 3) == 0 || ((*desc & 3) == 2 && (*desc & (1 << 18))) )
198 if( pi->PhysAddr == 0 ) {
203 *desc = pi->PhysAddr & 0xFF000000;
204 // *desc |= ((pi->PhysAddr >> 32) & 0xF) << 20;
205 // *desc |= ((pi->PhysAddr >> 36) & 0x7) << 5;
206 *desc |= 2 | (1 << 18);
208 // TODO: Apply to all entries
209 Log_Warning("MMVirt", "TODO: Apply changes to all entries of supersections");
214 Log_Warning("MMVirt", "TODO: 24-bit not on supersection?");
223 int MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
225 Uint32 *table0, *table1;
228 // LogF("MM_int_GetPageInfo: VAddr=%p, pi=%p\n", VAddr, pi);
230 MM_int_GetTables(VAddr, &table0, &table1);
232 desc = table0[ VAddr >> 20 ];
234 // if( VAddr > 0x90000000)
235 // LOG("table0 desc(%p) = %x", &table0[ VAddr >> 20 ], desc);
251 // 1: Coarse page table
253 // Domain from top level table
254 pi->Domain = (desc >> 5) & 7;
256 desc = table1[ VAddr >> 12 ];
257 // LOG("table1 desc(%p) = %x", &table1[ VAddr >> 12 ], desc);
264 // 1: Large Page (64KiB)
267 pi->PhysAddr = desc & 0xFFFF0000;
268 pi->AP = ((desc >> 4) & 3) | (((desc >> 9) & 1) << 2);
269 pi->bExecutable = !(desc & 0x8000);
270 pi->bShared = (desc >> 10) & 1;
276 pi->PhysAddr = desc & 0xFFFFF000;
277 pi->bExecutable = !(desc & 1);
278 pi->bGlobal = !(desc >> 11);
279 pi->bShared = (desc >> 10) & 1;
280 pi->AP = ((desc >> 4) & 3) | (((desc >> 9) & 1) << 2);
285 // 2: Section (or Supersection)
287 if( desc & (1 << 18) ) {
289 pi->PhysAddr = desc & 0xFF000000;
290 pi->PhysAddr |= (Uint64)((desc >> 20) & 0xF) << 32;
291 pi->PhysAddr |= (Uint64)((desc >> 5) & 0x7) << 36;
293 pi->Domain = 0; // Supersections default to zero
294 pi->AP = ((desc >> 10) & 3) | (((desc >> 15) & 1) << 2);
299 pi->PhysAddr = desc & 0xFFF80000;
301 pi->Domain = (desc >> 5) & 7;
302 pi->AP = ((desc >> 10) & 3) | (((desc >> 15) & 1) << 2);
305 // 3: Reserved (invalid)
316 tPAddr MM_GetPhysAddr(tVAddr VAddr)
319 if( MM_int_GetPageInfo(VAddr, &pi) )
321 return pi.PhysAddr | (VAddr & ((1 << pi.Size)-1));
324 Uint MM_GetFlags(tVAddr VAddr)
329 if( MM_int_GetPageInfo(VAddr, &pi) )
339 ret |= MM_PFLAG_KERNEL;
342 ret |= MM_PFLAG_KERNEL|MM_PFLAG_RO;
354 if( pi.bExecutable ) ret |= MM_PFLAG_EXEC;
358 void MM_SetFlags(tVAddr VAddr, Uint Flags, Uint Mask)
363 if( MM_int_GetPageInfo(VAddr, &pi) )
366 curFlags = MM_GetFlags(VAddr);
367 if( (curFlags & Mask) == Flags )
372 if( curFlags & MM_PFLAG_COW )
376 switch(curFlags & (MM_PFLAG_KERNEL|MM_PFLAG_RO) )
379 pi.AP = AP_RW_BOTH; break;
380 case MM_PFLAG_KERNEL:
381 pi.AP = AP_KRW_ONLY; break;
383 pi.AP = AP_RO_USER; break;
384 case MM_PFLAG_KERNEL|MM_PFLAG_RO:
385 pi.AP = AP_KRO_ONLY; break;
389 pi.bExecutable = !!(curFlags & MM_PFLAG_EXEC);
391 MM_int_SetPageInfo(VAddr, &pi);
394 int MM_Map(tVAddr VAddr, tPAddr PAddr)
396 tMM_PageInfo pi = {0};
398 Log("MM_Map %P=>%p", PAddr, VAddr);
403 if(VAddr < USER_STACK_TOP)
406 pi.AP = AP_KRW_ONLY; // Kernel Read/Write
408 if( MM_int_SetPageInfo(VAddr, &pi) ) {
409 // MM_DerefPhys(pi.PhysAddr);
415 tPAddr MM_Allocate(tVAddr VAddr)
417 tMM_PageInfo pi = {0};
419 ENTER("pVAddr", VAddr);
421 pi.PhysAddr = MM_AllocPhys();
422 if( pi.PhysAddr == 0 ) LEAVE_RET('i', 0);
424 if(VAddr < USER_STACK_TOP)
429 if( MM_int_SetPageInfo(VAddr, &pi) ) {
430 MM_DerefPhys(pi.PhysAddr);
434 LEAVE('x', pi.PhysAddr);
438 tPAddr MM_AllocateZero(tVAddr VAddr)
440 if( !giMM_ZeroPage ) {
441 giMM_ZeroPage = MM_Allocate(VAddr);
442 MM_RefPhys(giMM_ZeroPage);
443 memset((void*)VAddr, 0, PAGE_SIZE);
446 MM_RefPhys(giMM_ZeroPage);
447 MM_Map(VAddr, giMM_ZeroPage);
449 MM_SetFlags(VAddr, MM_PFLAG_COW, MM_PFLAG_COW);
450 return giMM_ZeroPage;
453 void MM_Deallocate(tVAddr VAddr)
457 if( MM_int_GetPageInfo(VAddr, &pi) ) return ;
459 if( pi.PhysAddr == 0 ) return;
460 MM_DerefPhys(pi.PhysAddr);
465 MM_int_SetPageInfo(VAddr, &pi);
468 tPAddr MM_AllocateRootTable(void)
472 ret = MM_AllocPhysRange(2, -1);
475 MM_DerefPhys(ret+0x1000);
476 ret = MM_AllocPhysRange(3, -1);
480 // Log("MM_AllocateRootTable: Second try not aligned, %P", ret);
483 MM_DerefPhys(ret + 0x2000);
484 // Log("MM_AllocateRootTable: Second try aligned, %P", ret);
488 // Log("MM_AllocateRootTable: Got it in one, %P", ret);
492 void MM_int_CloneTable(Uint32 *DestEnt, int Table)
496 Uint32 *cur = (void*)MM_TABLE1USER;
497 // Uint32 *cur = &FRACTAL(MM_TABLE1USER,0);
500 table = MM_AllocPhys();
505 tmp_map = (void*)MM_MapTemp(table);
507 for( i = 0; i < 1024; i ++ )
509 // Log_Debug("MMVirt", "cur[%i] (%p) = %x", Table*256+i, &cur[Table*256+i], cur[Table*256+i]);
512 case 0: tmp_map[i] = 0; break;
515 Log_Error("MMVirt", "TODO: Support large pages in MM_int_CloneTable (%p)", (Table*256+i)*0x1000);
522 // Debug("%p cur[%i] & 0x230 = 0x%x", Table*256*0x1000, i, cur[i] & 0x230);
523 if( (cur[i] & 0x230) == 0x010 )
527 newpage = MM_AllocPhys();
528 src = (void*)( (Table*256+i)*0x1000 );
529 dst = (void*)MM_MapTemp(newpage);
530 // Debug("Taking a copy of kernel page %p (%P)", src, cur[i] & ~0xFFF);
531 memcpy(dst, src, PAGE_SIZE);
532 MM_FreeTemp( (tVAddr)dst );
533 tmp_map[i] = newpage | (cur[i] & 0xFFF);
537 if( (cur[i] & 0x230) == 0x030 )
538 cur[i] |= 0x200; // Set to full RO (Full RO=COW, User RO = RO)
540 MM_RefPhys( tmp_map[i] & ~0xFFF );
545 MM_FreeTemp( (tVAddr) tmp_map );
547 DestEnt[0] = table + 0*0x400 + 1;
548 DestEnt[1] = table + 1*0x400 + 1;
549 DestEnt[2] = table + 2*0x400 + 1;
550 DestEnt[3] = table + 3*0x400 + 1;
553 tPAddr MM_Clone(void)
556 Uint32 *new_lvl1_1, *new_lvl1_2, *cur;
560 // MM_DumpTables(0, KERNEL_BASE);
562 ret = MM_AllocateRootTable();
564 cur = (void*)MM_TABLE0USER;
565 new_lvl1_1 = (void*)MM_MapTemp(ret);
566 new_lvl1_2 = (void*)MM_MapTemp(ret+0x1000);
567 tmp_map = new_lvl1_1;
568 for( i = 0; i < 0x800-4; i ++ )
570 // HACK! Ignore the original identity mapping
571 if( i == 0 && Threads_GetTID() == 0 ) {
576 tmp_map = &new_lvl1_2[-0x400];
579 case 0: tmp_map[i] = 0; break;
581 MM_int_CloneTable(&tmp_map[i], i);
582 i += 3; // Tables are alocated in blocks of 4
586 Log_Error("MMVirt", "TODO: Support Sections/Supersections in MM_Clone (i=%i)", i);
592 // Allocate Fractal table
595 tPAddr tmp = MM_AllocPhys();
596 Uint32 *table = (void*)MM_MapTemp(tmp);
598 register Uint32 __SP asm("sp");
600 // Map table to last 4MiB of user space
601 new_lvl1_2[0x3FC] = tmp + 0*0x400 + 1;
602 new_lvl1_2[0x3FD] = tmp + 1*0x400 + 1;
603 new_lvl1_2[0x3FE] = tmp + 2*0x400 + 1;
604 new_lvl1_2[0x3FF] = tmp + 3*0x400 + 1;
606 tmp_map = new_lvl1_1;
607 for( j = 0; j < 512; j ++ )
610 tmp_map = &new_lvl1_2[-0x400];
611 if( (tmp_map[j*4] & 3) == 1 )
613 table[j] = tmp_map[j*4] & PADDR_MASK_LVL1;// 0xFFFFFC00;
614 table[j] |= 0x813; // nG, Kernel Only, Small page, XN
620 table[j++] = (ret + 0x0000) | 0x813;
621 table[j++] = (ret + 0x1000) | 0x813;
623 for( ; j < 1024; j ++ )
626 // Get kernel stack bottom
627 sp = __SP & ~(MM_KSTACK_SIZE-1);
628 j = (sp / 0x1000) % 1024;
629 num = MM_KSTACK_SIZE/0x1000;
631 // Log("num = %i, sp = %p, j = %i", num, sp, j);
634 for(; num--; j ++, sp += 0x1000)
639 page = MM_AllocPhys();
640 // Log("page = %P", page);
641 table[j] = page | 0x813;
643 tmp_page = (void*)MM_MapTemp(page);
644 memcpy(tmp_page, (void*)sp, 0x1000);
645 MM_FreeTemp( (tVAddr) tmp_page );
648 MM_FreeTemp( (tVAddr)table );
651 MM_FreeTemp( (tVAddr)new_lvl1_1 );
652 MM_FreeTemp( (tVAddr)new_lvl1_2 );
657 void MM_ClearUser(void)
660 const int user_table_count = USER_STACK_TOP / (256*0x1000);
661 Uint32 *cur = (void*)MM_TABLE0USER;
664 // MM_DumpTables(0, 0x80000000);
666 // Log("user_table_count = %i (as opposed to %i)", user_table_count, 0x800-4);
668 for( i = 0; i < user_table_count; i ++ )
672 case 0: break; // Already unmapped
674 tab = (void*)(MM_TABLE1USER + i*256*sizeof(Uint32));
675 for( j = 0; j < 1024; j ++ )
679 case 0: break; // Unmapped
681 Log_Error("MMVirt", "TODO: Support large pages in MM_ClearUser");
685 MM_DerefPhys( tab[j] & ~(PAGE_SIZE-1) );
689 MM_DerefPhys( cur[i] & ~(PAGE_SIZE-1) );
697 Log_Error("MMVirt", "TODO: Implement sections/supersections in MM_ClearUser");
703 // Final block of 4 tables are KStack
706 // Clear out unused stacks
708 register Uint32 __SP asm("sp");
709 int cur_stack_base = ((__SP & ~(MM_KSTACK_SIZE-1)) / PAGE_SIZE) % 1024;
711 tab = (void*)(MM_TABLE1USER + i*256*sizeof(Uint32));
713 // First 512 is the Table1 mapping + 2 for Table0 mapping
714 for( j = 512+2; j < 1024; j ++ )
716 // Skip current stack
717 if( j == cur_stack_base ) {
718 j += (MM_KSTACK_SIZE / PAGE_SIZE) - 1;
721 if( !(tab[j] & 3) ) continue;
722 ASSERT( (tab[j] & 3) == 2 );
723 MM_DerefPhys( tab[j] & ~(PAGE_SIZE) );
729 // MM_DumpTables(0, 0x80000000);
732 tVAddr MM_MapTemp(tPAddr PAddr)
737 for( ret = MM_TMPMAP_BASE; ret < MM_TMPMAP_END - PAGE_SIZE; ret += PAGE_SIZE )
739 if( MM_int_GetPageInfo(ret, &pi) == 0 )
742 // Log("MapTemp %P at %p by %p", PAddr, ret, __builtin_return_address(0));
743 MM_RefPhys(PAddr); // Counter the MM_Deallocate in FreeTemp
748 Log_Warning("MMVirt", "MM_MapTemp: All slots taken");
752 void MM_FreeTemp(tVAddr VAddr)
754 if( VAddr < MM_TMPMAP_BASE || VAddr >= MM_TMPMAP_END ) {
755 Log_Warning("MMVirt", "MM_FreeTemp: Passed an addr not from MM_MapTemp (%p)", VAddr);
759 MM_Deallocate(VAddr);
762 tVAddr MM_MapHWPages(tPAddr PAddr, Uint NPages)
768 ENTER("xPAddr iNPages", PAddr, NPages);
770 // Scan for a location
771 for( ret = MM_HWMAP_BASE; ret < MM_HWMAP_END - NPages * PAGE_SIZE; ret += PAGE_SIZE )
773 // LOG("checking %p", ret);
774 // Check if there is `NPages` free pages
775 for( i = 0; i < NPages; i ++ )
777 if( MM_int_GetPageInfo(ret + i*PAGE_SIZE, &pi) == 0 )
780 // Nope, jump to after the used page found and try again
781 // LOG("i = %i, ==? %i", i, NPages);
783 ret += i * PAGE_SIZE;
788 for( i = 0; i < NPages; i ++ )
789 MM_Map(ret+i*PAGE_SIZE, PAddr+i*PAGE_SIZE);
794 Log_Warning("MMVirt", "MM_MapHWPages: No space for a %i page block", NPages);
799 tVAddr MM_AllocDMA(int Pages, int MaxBits, tPAddr *PAddr)
804 phys = MM_AllocPhysRange(Pages, MaxBits);
806 Log_Warning("MMVirt", "No space left for a %i page block (MM_AllocDMA)", Pages);
810 ret = MM_MapHWPages(phys, Pages);
816 void MM_UnmapHWPages(tVAddr Vaddr, Uint Number)
818 Log_Error("MMVirt", "TODO: Implement MM_UnmapHWPages");
821 tVAddr MM_NewKStack(int bShared)
823 tVAddr min_addr, max_addr;
827 min_addr = MM_GLOBALSTACKS;
828 max_addr = MM_GLOBALSTACKS_END;
831 min_addr = MM_KSTACK_BASE;
832 max_addr = MM_KSTACK_END;
835 // Locate a free slot
836 for( addr = min_addr; addr < max_addr; addr += MM_KSTACK_SIZE )
839 if( MM_int_GetPageInfo(addr+MM_KSTACK_SIZE-PAGE_SIZE, &pi) ) break;
842 // Check for an error
843 if(addr >= max_addr) {
848 for( ofs = PAGE_SIZE; ofs < MM_KSTACK_SIZE; ofs += PAGE_SIZE )
850 if( MM_Allocate(addr + ofs) == 0 )
855 MM_Deallocate(addr + ofs);
857 Log_Warning("MMVirt", "MM_NewKStack: Unable to allocate");
864 tVAddr MM_NewUserStack(void)
868 addr = USER_STACK_TOP - USER_STACK_SIZE;
869 if( MM_GetPhysAddr(addr + PAGE_SIZE) ) {
870 Log_Error("MMVirt", "Unable to create initial user stack, addr %p taken",
877 for( ofs = PAGE_SIZE; ofs < USER_STACK_SIZE; ofs += PAGE_SIZE )
880 if(ofs >= USER_STACK_SIZE - USER_STACK_COMM)
881 rv = MM_Allocate(addr + ofs);
883 rv = MM_AllocateZero(addr + ofs);
889 MM_Deallocate(addr + ofs);
891 Log_Warning("MMVirt", "MM_NewUserStack: Unable to allocate");
894 MM_SetFlags(addr+ofs, 0, MM_PFLAG_KERNEL);
896 // Log("Return %p", addr + ofs);
897 // MM_DumpTables(0, 0x80000000);
901 void MM_int_DumpTableEnt(tVAddr Start, size_t Len, tMM_PageInfo *Info)
903 if( giMM_ZeroPage && Info->PhysAddr == giMM_ZeroPage )
905 Debug("%p => %8s - 0x%7x %i %x",
907 Info->Domain, Info->AP
912 Debug("%p => %8x - 0x%7x %i %x",
913 Start, Info->PhysAddr-Len, Len,
914 Info->Domain, Info->AP
919 void MM_DumpTables(tVAddr Start, tVAddr End)
921 tVAddr range_start = 0, addr;
922 tMM_PageInfo pi, pi_old;
923 int i = 0, inRange=0;
927 Debug("Page Table Dump (%p to %p):", Start, End);
929 for( addr = Start; i == 0 || (addr && addr < End); i = 1 )
932 // Log("addr = %p", addr);
933 rv = MM_int_GetPageInfo(addr, &pi);
935 || pi.Size != pi_old.Size
936 || pi.Domain != pi_old.Domain
937 || pi.AP != pi_old.AP
938 || pi_old.PhysAddr != pi.PhysAddr )
941 MM_int_DumpTableEnt(range_start, addr - range_start, &pi_old);
943 addr &= ~((1 << pi.Size)-1);
948 // Handle the zero page
949 if( !giMM_ZeroPage || pi_old.Size != 12 || pi_old.PhysAddr != giMM_ZeroPage )
950 pi_old.PhysAddr += 1 << pi_old.Size;
951 addr += 1 << pi_old.Size;
955 MM_int_DumpTableEnt(range_start, addr - range_start, &pi);
959 // NOTE: Runs in abort context, not much difference, just a smaller stack
960 void MM_PageFault(Uint32 PC, Uint32 Addr, Uint32 DFSR, int bPrefetch)
965 rv = MM_int_GetPageInfo(Addr, &pi);
968 if( rv == 0 && pi.AP == AP_RO_BOTH )
971 if( giMM_ZeroPage && pi.PhysAddr == giMM_ZeroPage )
974 newpage = MM_AllocPhys();
976 Log_Error("MMVirt", "Unable to allocate new page for COW of ZERO");
981 Log_Notice("MMVirt", "COW %p caused by %p, ZERO duped to %P (RefCnt(%i)--)", Addr, PC,
982 newpage, MM_GetRefCount(pi.PhysAddr));
985 MM_DerefPhys(pi.PhysAddr);
986 pi.PhysAddr = newpage;
988 MM_int_SetPageInfo(Addr, &pi);
990 memset( (void*)(Addr & ~(PAGE_SIZE-1)), 0, PAGE_SIZE );
994 else if( MM_GetRefCount(pi.PhysAddr) > 1 )
996 // Duplicate the page
1000 newpage = MM_AllocPhys();
1002 Log_Error("MMVirt", "Unable to allocate new page for COW");
1005 dst = (void*)MM_MapTemp(newpage);
1006 src = (void*)(Addr & ~(PAGE_SIZE-1));
1007 memcpy( dst, src, PAGE_SIZE );
1008 MM_FreeTemp( (tVAddr)dst );
1011 Log_Notice("MMVirt", "COW %p caused by %p, %P duped to %P (RefCnt(%i)--)", Addr, PC,
1012 pi.PhysAddr, newpage, MM_GetRefCount(pi.PhysAddr));
1015 MM_DerefPhys(pi.PhysAddr);
1016 pi.PhysAddr = newpage;
1020 Log_Notice("MMVirt", "COW %p caused by %p, took last reference to %P",
1021 Addr, PC, pi.PhysAddr);
1026 MM_int_SetPageInfo(Addr, &pi);
1031 Log_Error("MMVirt", "Code at %p accessed %p (DFSR = 0x%x)%s", PC, Addr, DFSR,
1032 (bPrefetch ? " - Prefetch" : "")
1034 if( Addr < 0x80000000 )
1035 MM_DumpTables(0, 0x80000000);
1037 MM_DumpTables(0x80000000, -1);