2 * AcessOS Microkernel Version
10 * 0xFF - System Calls / Kernel's User Code
23 #define WORKER_STACKS 0x00100000 // Thread0 Only!
24 #define WORKER_STACK_SIZE MM_KERNEL_STACK_SIZE
25 #define WORKER_STACKS_END 0xB0000000
26 #define NUM_WORKER_STACKS ((WORKER_STACKS_END-WORKER_STACKS)/WORKER_STACK_SIZE)
28 #define PAE_PAGE_TABLE_ADDR 0xFC000000 // 16 MiB
29 #define PAE_PAGE_DIR_ADDR 0xFCFC0000 // 16 KiB
30 #define PAE_PAGE_PDPT_ADDR 0xFCFC3F00 // 32 bytes
31 #define PAE_TMP_PDPT_ADDR 0xFCFC3F20 // 32 bytes
32 #define PAE_TMP_DIR_ADDR 0xFCFE0000 // 16 KiB
33 #define PAE_TMP_TABLE_ADDR 0xFD000000 // 16 MiB
35 #define PAGE_TABLE_ADDR 0xFC000000
36 #define PAGE_DIR_ADDR 0xFC3F0000
37 #define PAGE_CR3_ADDR 0xFC3F0FC0
38 #define TMP_CR3_ADDR 0xFC3F0FC4 // Part of core instead of temp
39 #define TMP_DIR_ADDR 0xFC3F1000 // Same
40 #define TMP_TABLE_ADDR 0xFC400000
42 #define HW_MAP_ADDR 0xFE000000
43 #define HW_MAP_MAX 0xFFEF0000
44 #define NUM_HW_PAGES ((HW_MAP_MAX-HW_MAP_ADDR)/0x1000)
45 #define TEMP_MAP_ADDR 0xFFEF0000 // Allows 16 "temp" pages
46 #define NUM_TEMP_PAGES 16
47 #define LAST_BLOCK_ADDR 0xFFFF0000 // Free space for kernel provided user code/ *(-1) protection
49 #define PF_PRESENT 0x1
52 #define PF_GLOBAL 0x80
54 #define PF_NOPAGE 0x400
56 #define INVLPG(addr) __asm__ __volatile__ ("invlpg (%0)"::"r"(addr))
58 #define GET_TEMP_MAPPING(cr3) do { \
60 __AtomicTestSetLoop( (Uint *)gpTmpCR3, cr3 | 3 ); \
62 #define REL_TEMP_MAPPING() do { \
67 typedef Uint32 tTabEnt;
70 extern char _UsertextEnd[], _UsertextBase[];
71 extern Uint32 gaInitPageDir[1024];
72 extern Uint32 gaInitPageTable[1024];
73 extern void Threads_SegFault(tVAddr Addr);
74 extern void Error_Backtrace(Uint eip, Uint ebp);
77 void MM_PreinitVirtual(void);
78 void MM_InstallVirtual(void);
79 void MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs);
80 //void MM_DumpTables(tVAddr Start, tVAddr End);
81 //void MM_ClearUser(void);
82 tPAddr MM_DuplicatePage(tVAddr VAddr);
85 #define gaPageTable ((tTabEnt*)PAGE_TABLE_ADDR)
86 #define gaPageDir ((tTabEnt*)PAGE_DIR_ADDR)
87 #define gaTmpTable ((tTabEnt*)TMP_TABLE_ADDR)
88 #define gaTmpDir ((tTabEnt*)TMP_DIR_ADDR)
89 #define gpPageCR3 ((tTabEnt*)PAGE_CR3_ADDR)
90 #define gpTmpCR3 ((tTabEnt*)TMP_CR3_ADDR)
92 #define gaPAE_PageTable ((tTabEnt*)PAE_PAGE_TABLE_ADDR)
93 #define gaPAE_PageDir ((tTabEnt*)PAE_PAGE_DIR_ADDR)
94 #define gaPAE_MainPDPT ((tTabEnt*)PAE_PAGE_PDPT_ADDR)
95 #define gaPAE_TmpTable ((tTabEnt*)PAE_TMP_DIR_ADDR)
96 #define gaPAE_TmpDir ((tTabEnt*)PAE_TMP_DIR_ADDR)
97 #define gaPAE_TmpPDPT ((tTabEnt*)PAE_TMP_PDPT_ADDR)
99 tMutex glTempMappings;
100 tMutex glTempFractal;
101 Uint32 gWorkerStacks[(NUM_WORKER_STACKS+31)/32];
102 int giLastUsedWorker = 0;
109 } *gaMappedRegions; // sizeof = 24 bytes
113 * \fn void MM_PreinitVirtual(void)
114 * \brief Maps the fractal mappings
116 void MM_PreinitVirtual(void)
118 gaInitPageDir[ PAGE_TABLE_ADDR >> 22 ] = ((tTabEnt)&gaInitPageDir - KERNEL_BASE) | 3;
119 INVLPG( PAGE_TABLE_ADDR );
123 * \fn void MM_InstallVirtual(void)
124 * \brief Sets up the constant page mappings
126 void MM_InstallVirtual(void)
130 // --- Pre-Allocate kernel tables
131 for( i = KERNEL_BASE>>22; i < 1024; i ++ )
133 if( gaPageDir[ i ] ) continue;
134 // Skip stack tables, they are process unique
135 if( i > MM_KERNEL_STACKS >> 22 && i < MM_KERNEL_STACKS_END >> 22) {
140 gaPageDir[ i ] = MM_AllocPhys() | 3;
141 INVLPG( &gaPageTable[i*1024] );
142 memset( &gaPageTable[i*1024], 0, 0x1000 );
145 // Unset kernel on the User Text pages
146 for( i = ((tVAddr)&_UsertextEnd-(tVAddr)&_UsertextBase+0xFFF)/4096; i--; ) {
147 MM_SetFlags( (tVAddr)&_UsertextBase + i*4096, 0, MM_PFLAG_KERNEL );
154 * \brief Cleans up the SMP required mappings
156 void MM_FinishVirtualInit(void)
158 gaInitPageDir[ 0 ] = 0;
162 * \fn void MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs)
163 * \brief Called on a page fault
165 void MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs)
167 //ENTER("xAddr bErrorCode", Addr, ErrorCode);
169 // -- Check for COW --
170 if( gaPageDir [Addr>>22] & PF_PRESENT && gaPageTable[Addr>>12] & PF_PRESENT
171 && gaPageTable[Addr>>12] & PF_COW )
174 __asm__ __volatile__ ("sti");
175 if(MM_GetRefCount( gaPageTable[Addr>>12] & ~0xFFF ) == 1)
177 gaPageTable[Addr>>12] &= ~PF_COW;
178 gaPageTable[Addr>>12] |= PF_PRESENT|PF_WRITE;
182 //Log("MM_PageFault: COW - MM_DuplicatePage(0x%x)", Addr);
183 paddr = MM_DuplicatePage( Addr );
184 MM_DerefPhys( gaPageTable[Addr>>12] & ~0xFFF );
185 gaPageTable[Addr>>12] &= PF_USER;
186 gaPageTable[Addr>>12] |= paddr|PF_PRESENT|PF_WRITE;
189 // Log_Debug("MMVirt", "COW for %p (%P)", Addr, gaPageTable[Addr>>12]);
191 INVLPG( Addr & ~0xFFF );
195 // Disable instruction tracing
196 __ASM__("pushf; andw $0xFEFF, 0(%esp); popf");
197 Proc_GetCurThread()->bInstrTrace = 0;
199 // If it was a user, tell the thread handler
201 __asm__ __volatile__ ("sti");
202 Log_Warning("MMVirt", "User %s %s memory%s",
203 (ErrorCode&2?"write to":"read from"),
204 (ErrorCode&1?"bad/locked":"non-present"),
205 (ErrorCode&16?" (Instruction Fetch)":"")
207 Log_Warning("MMVirt", "Instruction %04x:%08x accessed %p", Regs->cs, Regs->eip, Addr);
208 __ASM__("sti"); // Restart IRQs
210 Error_Backtrace(Regs->eip, Regs->ebp);
212 Threads_SegFault(Addr);
218 // -- Check Error Code --
220 Warning("Reserved Bits Trashed!");
223 Warning("Kernel %s %s memory%s",
224 (ErrorCode&2?"write to":"read from"),
225 (ErrorCode&1?"bad/locked":"non-present"),
226 (ErrorCode&16?" (Instruction Fetch)":"")
230 Log("CPU %i - Code at %p accessed %p", GetCPUNum(), Regs->eip, Addr);
231 // Print Stack Backtrace
232 Error_Backtrace(Regs->eip, Regs->ebp);
235 Log("gaPageDir[0x%x] = 0x%x", Addr>>22, gaPageDir[Addr>>22]);
236 if( gaPageDir[Addr>>22] & PF_PRESENT )
237 Log("gaPageTable[0x%x] = 0x%x", Addr>>12, gaPageTable[Addr>>12]);
239 //MM_DumpTables(0, -1);
242 Log("EAX %08x ECX %08x EDX %08x EBX %08x", Regs->eax, Regs->ecx, Regs->edx, Regs->ebx);
243 Log("ESP %08x EBP %08x ESI %08x EDI %08x", Regs->esp, Regs->ebp, Regs->esi, Regs->edi);
244 //Log("SS:ESP %04x:%08x", Regs->ss, Regs->esp);
245 Log("CS:EIP %04x:%08x", Regs->cs, Regs->eip);
246 Log("DS %04x ES %04x FS %04x GS %04x", Regs->ds, Regs->es, Regs->fs, Regs->gs);
249 __ASM__ ("mov %%dr0, %0":"=r"(dr0):);
250 __ASM__ ("mov %%dr1, %0":"=r"(dr1):);
251 Log("DR0 %08x DR1 %08x", dr0, dr1);
254 Panic("Page Fault at 0x%x (Accessed 0x%x)", Regs->eip, Addr);
258 * \fn void MM_DumpTables(tVAddr Start, tVAddr End)
259 * \brief Dumps the layout of the page tables
261 void MM_DumpTables(tVAddr Start, tVAddr End)
263 tVAddr rangeStart = 0;
265 void *expected_node = NULL, *tmpnode = NULL;
268 const tPAddr MASK = ~0xF78;
270 Start >>= 12; End >>= 12;
273 Log("Directory Entries:");
274 for(page = Start >> 10;
275 page < (End >> 10)+1;
280 Log(" 0x%08x-0x%08x :: 0x%08x",
281 page<<22, ((page+1)<<22)-1,
282 gaPageDir[page]&~0xFFF
288 Log("Table Entries:");
289 for(page = Start, curPos = Start<<12;
291 curPos += 0x1000, page++)
293 if( !(gaPageDir[curPos>>22] & PF_PRESENT)
294 || !(gaPageTable[page] & PF_PRESENT)
295 || (gaPageTable[page] & MASK) != expected
296 || (tmpnode=NULL,MM_GetPageNode(expected, &tmpnode), tmpnode != expected_node))
299 tPAddr orig = gaPageTable[rangeStart>>12];
300 Log(" 0x%08x => 0x%08x - 0x%08x (%s%s%s%s%s) %p",
304 (orig & PF_NOPAGE ? "P" : "-"),
305 (orig & PF_COW ? "C" : "-"),
306 (orig & PF_GLOBAL ? "G" : "-"),
307 (orig & PF_USER ? "U" : "-"),
308 (orig & PF_WRITE ? "W" : "-"),
313 if( !(gaPageDir[curPos>>22] & PF_PRESENT) ) continue;
314 if( !(gaPageTable[curPos>>12] & PF_PRESENT) ) continue;
316 expected = (gaPageTable[page] & MASK);
317 MM_GetPageNode(expected, &expected_node);
320 if(expected) expected += 0x1000;
324 tPAddr orig = gaPageTable[rangeStart>>12];
325 Log("0x%08x => 0x%08x - 0x%08x (%s%s%s%s%s) %p",
329 (orig & PF_NOPAGE ? "p" : "-"),
330 (orig & PF_COW ? "C" : "-"),
331 (orig & PF_GLOBAL ? "G" : "-"),
332 (orig & PF_USER ? "U" : "-"),
333 (orig & PF_WRITE ? "W" : "-"),
341 * \fn tPAddr MM_Allocate(tVAddr VAddr)
343 tPAddr MM_Allocate(tVAddr VAddr)
346 //ENTER("xVAddr", VAddr);
347 //__ASM__("xchg %bx,%bx");
348 // Check if the directory is mapped
349 if( gaPageDir[ VAddr >> 22 ] == 0 )
351 // Allocate directory
352 paddr = MM_AllocPhys();
354 Warning("MM_Allocate - Out of Memory (Called by %p)", __builtin_return_address(0));
358 // Map and mark as user (if needed)
359 gaPageDir[ VAddr >> 22 ] = paddr | 3;
360 if(VAddr < MM_USER_MAX) gaPageDir[ VAddr >> 22 ] |= PF_USER;
362 INVLPG( &gaPageDir[ VAddr >> 22 ] );
363 memsetd( &gaPageTable[ (VAddr >> 12) & ~0x3FF ], 0, 1024 );
365 // Check if the page is already allocated
366 else if( gaPageTable[ VAddr >> 12 ] != 0 ) {
367 Warning("MM_Allocate - Allocating to used address (%p)", VAddr);
368 //LEAVE('X', gaPageTable[ VAddr >> 12 ] & ~0xFFF);
369 return gaPageTable[ VAddr >> 12 ] & ~0xFFF;
373 paddr = MM_AllocPhys();
374 //LOG("paddr = 0x%llx", paddr);
376 Warning("MM_Allocate - Out of Memory when allocating at %p (Called by %p)",
377 VAddr, __builtin_return_address(0));
382 gaPageTable[ VAddr >> 12 ] = paddr | 3;
384 if(VAddr < MM_USER_MAX) gaPageTable[ VAddr >> 12 ] |= PF_USER;
385 // Invalidate Cache for address
386 INVLPG( VAddr & ~0xFFF );
393 * \fn void MM_Deallocate(tVAddr VAddr)
395 void MM_Deallocate(tVAddr VAddr)
397 if( gaPageDir[ VAddr >> 22 ] == 0 ) {
398 Warning("MM_Deallocate - Directory not mapped");
402 if(gaPageTable[ VAddr >> 12 ] == 0) {
403 Warning("MM_Deallocate - Page is not allocated");
408 MM_DerefPhys( gaPageTable[ VAddr >> 12 ] & ~0xFFF );
410 gaPageTable[ VAddr >> 12 ] = 0;
414 * \fn tPAddr MM_GetPhysAddr(tVAddr Addr)
415 * \brief Checks if the passed address is accesable
417 tPAddr MM_GetPhysAddr(tVAddr Addr)
419 if( !(gaPageDir[Addr >> 22] & 1) )
421 if( !(gaPageTable[Addr >> 12] & 1) )
423 return (gaPageTable[Addr >> 12] & ~0xFFF) | (Addr & 0xFFF);
427 * \fn void MM_SetCR3(Uint CR3)
428 * \brief Sets the current process space
430 void MM_SetCR3(Uint CR3)
432 __ASM__("mov %0, %%cr3"::"r"(CR3));
436 * \fn int MM_Map(tVAddr VAddr, tPAddr PAddr)
437 * \brief Map a physical page to a virtual one
439 int MM_Map(tVAddr VAddr, tPAddr PAddr)
441 //ENTER("xVAddr xPAddr", VAddr, PAddr);
443 if( PAddr & 0xFFF || VAddr & 0xFFF ) {
444 Log_Warning("MM_Virt", "MM_Map - Physical or Virtual Addresses are not aligned");
450 PAddr &= ~0xFFF; VAddr &= ~0xFFF;
452 // Check if the directory is mapped
453 if( gaPageDir[ VAddr >> 22 ] == 0 )
455 tPAddr tmp = MM_AllocPhys();
458 gaPageDir[ VAddr >> 22 ] = tmp | 3;
461 if(VAddr < MM_USER_MAX) gaPageDir[ VAddr >> 22 ] |= PF_USER;
463 INVLPG( &gaPageTable[ (VAddr >> 12) & ~0x3FF ] );
464 memsetd( &gaPageTable[ (VAddr >> 12) & ~0x3FF ], 0, 1024 );
466 // Check if the page is already allocated
467 else if( gaPageTable[ VAddr >> 12 ] != 0 ) {
468 Warning("MM_Map - Allocating to used address");
474 gaPageTable[ VAddr >> 12 ] = PAddr | 3;
476 if(VAddr < MM_USER_MAX) gaPageTable[ VAddr >> 12 ] |= PF_USER;
478 //LOG("gaPageTable[ 0x%x ] = (Uint)%p = 0x%x",
479 // VAddr >> 12, &gaPageTable[ VAddr >> 12 ], gaPageTable[ VAddr >> 12 ]);
484 //LOG("INVLPG( 0x%x )", VAddr);
492 * \brief Clear user's address space
494 void MM_ClearUser(void)
498 for( i = 0; i < (MM_USER_MAX>>22); i ++ )
500 // Check if directory is not allocated
501 if( !(gaPageDir[i] & PF_PRESENT) ) {
507 for( j = 0; j < 1024; j ++ )
509 if( gaPageTable[i*1024+j] & 1 )
510 MM_DerefPhys( gaPageTable[i*1024+j] & ~0xFFF );
511 gaPageTable[i*1024+j] = 0;
514 // Deallocate directory
515 MM_DerefPhys( gaPageDir[i] & ~0xFFF );
517 INVLPG( &gaPageTable[i*1024] );
523 * \brief Deallocate an address space
525 void MM_ClearSpace(Uint32 CR3)
529 if(CR3 == (*gpPageCR3 & ~0xFFF)) {
530 Log_Error("MMVirt", "Can't clear current address space");
534 if( MM_GetRefCount(CR3) > 1 ) {
536 Log_Log("MMVirt", "CR3 %P is still referenced, not cleaning (but dereferenced)", CR3);
540 Log_Debug("MMVirt", "Clearing out address space 0x%x from 0x%x", CR3, *gpPageCR3);
542 GET_TEMP_MAPPING(CR3);
545 for( i = 0; i < 1024; i ++ )
547 Uint32 *table = &gaTmpTable[i*1024];
548 if( !(gaTmpDir[i] & PF_PRESENT) )
553 if( i < 768 || (i > MM_KERNEL_STACKS >> 22 && i < MM_KERNEL_STACKS_END >> 22) )
555 for( j = 0; j < 1024; j ++ )
557 if( !(table[j] & 1) )
559 MM_DerefPhys( table[j] & ~0xFFF );
563 if( i != (PAGE_TABLE_ADDR >> 22) )
565 MM_DerefPhys( gaTmpDir[i] & ~0xFFF );
576 * \fn tPAddr MM_Clone(void)
577 * \brief Clone the current address space
579 tPAddr MM_Clone(int bNoUserCopy)
584 tVAddr kStackBase = Proc_GetCurThread()->KernelStack - MM_KERNEL_STACK_SIZE;
587 // Create Directory Table
588 ret = MM_AllocPhys();
594 GET_TEMP_MAPPING( ret );
596 memsetd( gaTmpDir, 0, 1024 );
598 if( Threads_GetPID() != 0 && !bNoUserCopy )
601 for( i = 0; i < 768; i ++)
603 // Check if table is allocated
604 if( !(gaPageDir[i] & PF_PRESENT) ) {
610 // Allocate new table
611 gaTmpDir[i] = MM_AllocPhys() | (gaPageDir[i] & 7);
612 INVLPG( &gaTmpTable[page] );
614 for( j = 0; j < 1024; j ++, page++ )
616 if( !(gaPageTable[page] & PF_PRESENT) ) {
617 gaTmpTable[page] = 0;
622 MM_RefPhys( gaPageTable[page] & ~0xFFF );
624 if(gaPageTable[page] & PF_WRITE) {
625 gaTmpTable[page] = (gaPageTable[page] & ~PF_WRITE) | PF_COW;
626 gaPageTable[page] = (gaPageTable[page] & ~PF_WRITE) | PF_COW;
627 INVLPG( page << 12 );
630 gaTmpTable[page] = gaPageTable[page];
635 // Map in kernel tables (and make fractal mapping)
636 for( i = 768; i < 1024; i ++ )
639 if( i == (PAGE_TABLE_ADDR >> 22) ) {
640 gaTmpDir[ PAGE_TABLE_ADDR >> 22 ] = *gpTmpCR3;
643 if( i == (TMP_TABLE_ADDR >> 22) ) {
644 gaTmpDir[ TMP_TABLE_ADDR >> 22 ] = 0;
648 if( gaPageDir[i] == 0 ) {
653 //LOG("gaPageDir[%x/4] = 0x%x", i*4, gaPageDir[i]);
654 MM_RefPhys( gaPageDir[i] & ~0xFFF );
655 gaTmpDir[i] = gaPageDir[i];
658 // Allocate kernel stack
659 for(i = MM_KERNEL_STACKS >> 22; i < MM_KERNEL_STACKS_END >> 22; i ++ )
661 // Check if directory is allocated
662 if( (gaPageDir[i] & 1) == 0 ) {
667 // We don't care about other kernel stacks, just the current one
668 if( i != kStackBase >> 22 ) {
669 MM_DerefPhys( gaPageDir[i] & ~0xFFF );
675 gaTmpDir[i] = MM_AllocPhys() | 3;
676 INVLPG( &gaTmpTable[i*1024] );
677 for( j = 0; j < 1024; j ++ )
679 // Is the page allocated? If not, skip
680 if( !(gaPageTable[i*1024+j] & 1) ) {
681 gaTmpTable[i*1024+j] = 0;
685 // We don't care about other kernel stacks
686 if( ((i*1024+j)*4096 & ~(MM_KERNEL_STACK_SIZE-1)) != kStackBase ) {
687 gaTmpTable[i*1024+j] = 0;
692 gaTmpTable[i*1024+j] = MM_AllocPhys() | 3;
694 MM_RefPhys( gaTmpTable[i*1024+j] & ~0xFFF );
696 tmp = (void *) MM_MapTemp( gaTmpTable[i*1024+j] & ~0xFFF );
697 memcpy( tmp, (void *)( (i*1024+j)*0x1000 ), 0x1000 );
698 MM_FreeTemp( (Uint)tmp );
709 * \fn tVAddr MM_NewKStack(void)
710 * \brief Create a new kernel stack
712 tVAddr MM_NewKStack(void)
716 for(base = MM_KERNEL_STACKS; base < MM_KERNEL_STACKS_END; base += MM_KERNEL_STACK_SIZE)
718 // Check if space is free
719 if(MM_GetPhysAddr(base) != 0) continue;
721 //for(i = MM_KERNEL_STACK_SIZE; i -= 0x1000 ; )
722 for(i = 0; i < MM_KERNEL_STACK_SIZE; i += 0x1000 )
724 if( MM_Allocate(base+i) == 0 )
726 // On error, print a warning and return error
727 Warning("MM_NewKStack - Out of memory");
729 //for( i += 0x1000 ; i < MM_KERNEL_STACK_SIZE; i += 0x1000 )
730 // MM_Deallocate(base+i);
735 // Log("MM_NewKStack - Allocated %p", base + MM_KERNEL_STACK_SIZE);
736 return base+MM_KERNEL_STACK_SIZE;
739 Log_Warning("MMVirt", "MM_NewKStack - No address space left");
744 * \fn tVAddr MM_NewWorkerStack()
745 * \brief Creates a new worker stack
747 tVAddr MM_NewWorkerStack(Uint *StackContents, size_t ContentsSize)
753 // TODO: Thread safety
754 // Find a free worker stack address
755 for(base = giLastUsedWorker; base < NUM_WORKER_STACKS; base++)
758 if( gWorkerStacks[base/32] == -1 ) {
759 base += 31; base &= ~31;
760 base --; // Counteracted by the base++
764 if( gWorkerStacks[base/32] & (1 << base) ) {
769 if(base >= NUM_WORKER_STACKS) {
770 Warning("Uh-oh! Out of worker stacks");
775 gWorkerStacks[base/32] |= (1 << base);
776 // Make life easier for later calls
777 giLastUsedWorker = base;
779 base = WORKER_STACKS + base * WORKER_STACK_SIZE;
780 //Log(" MM_NewWorkerStack: base = 0x%x", base);
782 // Set the temp fractals to TID0's address space
783 GET_TEMP_MAPPING( ((Uint)gaInitPageDir - KERNEL_BASE) );
786 // Check if the directory is mapped (we are assuming that the stacks
787 // will fit neatly in a directory)
788 //Log(" MM_NewWorkerStack: gaTmpDir[ 0x%x ] = 0x%x", base>>22, gaTmpDir[ base >> 22 ]);
789 if(gaTmpDir[ base >> 22 ] == 0) {
790 gaTmpDir[ base >> 22 ] = MM_AllocPhys() | 3;
791 INVLPG( &gaTmpTable[ (base>>12) & ~0x3FF ] );
795 for( addr = 0; addr < WORKER_STACK_SIZE; addr += 0x1000 )
797 page = MM_AllocPhys();
798 gaTmpTable[ (base + addr) >> 12 ] = page | 3;
801 // Release temporary fractal
804 // NOTE: Max of 1 page
805 // `page` is the last allocated page from the previious for loop
806 tmpPage = MM_MapTemp( page );
807 memcpy( (void*)( tmpPage + (0x1000 - ContentsSize) ), StackContents, ContentsSize);
808 MM_FreeTemp(tmpPage);
810 //Log("MM_NewWorkerStack: RETURN 0x%x", base);
811 return base + WORKER_STACK_SIZE;
815 * \fn void MM_SetFlags(tVAddr VAddr, Uint Flags, Uint Mask)
816 * \brief Sets the flags on a page
818 void MM_SetFlags(tVAddr VAddr, Uint Flags, Uint Mask)
821 if( !(gaPageDir[VAddr >> 22] & 1) ) return ;
822 if( !(gaPageTable[VAddr >> 12] & 1) ) return ;
824 ent = &gaPageTable[VAddr >> 12];
827 if( Mask & MM_PFLAG_RO )
829 if( Flags & MM_PFLAG_RO ) {
833 gaPageDir[VAddr >> 22] |= PF_WRITE;
839 if( Mask & MM_PFLAG_KERNEL )
841 if( Flags & MM_PFLAG_KERNEL ) {
845 gaPageDir[VAddr >> 22] |= PF_USER;
851 if( Mask & MM_PFLAG_COW )
853 if( Flags & MM_PFLAG_COW ) {
863 //Log("MM_SetFlags: *ent = 0x%08x, gaPageDir[%i] = 0x%08x",
864 // *ent, VAddr >> 22, gaPageDir[VAddr >> 22]);
868 * \brief Get the flags on a page
870 Uint MM_GetFlags(tVAddr VAddr)
876 if( !(gaPageDir[VAddr >> 22] & 1) ) return 0;
877 if( !(gaPageTable[VAddr >> 12] & 1) ) return 0;
879 ent = &gaPageTable[VAddr >> 12];
882 if( !(*ent & PF_WRITE) ) ret |= MM_PFLAG_RO;
884 if( !(*ent & PF_USER) ) ret |= MM_PFLAG_KERNEL;
886 if( *ent & PF_COW ) ret |= MM_PFLAG_COW;
892 * \brief Check if the provided buffer is valid
893 * \return Boolean valid
895 int MM_IsValidBuffer(tVAddr Addr, size_t Size)
900 Size += Addr & (PAGE_SIZE-1);
901 Addr &= ~(PAGE_SIZE-1);
906 // Debug("Addr = %p, Size = 0x%x, dir = %i, tab = %i", Addr, Size, dir, tab);
908 if( !(gaPageDir[dir] & 1) ) return 0;
909 if( !(gaPageTable[tab] & 1) ) return 0;
911 bIsUser = !!(gaPageTable[tab] & PF_USER);
913 while( Size >= PAGE_SIZE )
915 if( (tab & 1023) == 0 )
918 if( !(gaPageDir[dir] & 1) ) return 0;
921 if( !(gaPageTable[tab] & 1) ) return 0;
922 if( bIsUser && !(gaPageTable[tab] & PF_USER) ) return 0;
931 * \fn tPAddr MM_DuplicatePage(tVAddr VAddr)
932 * \brief Duplicates a virtual page to a physical one
934 tPAddr MM_DuplicatePage(tVAddr VAddr)
940 //ENTER("xVAddr", VAddr);
943 if( !(gaPageDir [VAddr >> 22] & PF_PRESENT) ) return 0;
944 if( !(gaPageTable[VAddr >> 12] & PF_PRESENT) ) return 0;
950 ret = MM_AllocPhys();
955 // Write-lock the page (to keep data constistent), saving its R/W state
956 wasRO = (gaPageTable[VAddr >> 12] & PF_WRITE ? 0 : 1);
957 gaPageTable[VAddr >> 12] &= ~PF_WRITE;
961 temp = MM_MapTemp(ret);
962 memcpy( (void*)temp, (void*)VAddr, 0x1000 );
965 // Restore Writeable status
966 if(!wasRO) gaPageTable[VAddr >> 12] |= PF_WRITE;
974 * \fn Uint MM_MapTemp(tPAddr PAddr)
975 * \brief Create a temporary memory mapping
976 * \todo Show Luigi Barone (C Lecturer) and see what he thinks
978 tVAddr MM_MapTemp(tPAddr PAddr)
982 //ENTER("XPAddr", PAddr);
986 //LOG("glTempMappings = %i", glTempMappings);
990 Mutex_Acquire( &glTempMappings );
992 for( i = 0; i < NUM_TEMP_PAGES; i ++ )
994 // Check if page used
995 if(gaPageTable[ (TEMP_MAP_ADDR >> 12) + i ] & 1) continue;
997 gaPageTable[ (TEMP_MAP_ADDR >> 12) + i ] = PAddr | 3;
998 INVLPG( TEMP_MAP_ADDR + (i << 12) );
999 //LEAVE('p', TEMP_MAP_ADDR + (i << 12));
1000 Mutex_Release( &glTempMappings );
1001 return TEMP_MAP_ADDR + (i << 12);
1003 Mutex_Release( &glTempMappings );
1004 Threads_Yield(); // TODO: Use a sleep queue here instead
1009 * \fn void MM_FreeTemp(tVAddr PAddr)
1010 * \brief Free's a temp mapping
1012 void MM_FreeTemp(tVAddr VAddr)
1014 int i = VAddr >> 12;
1015 //ENTER("xVAddr", VAddr);
1017 if(i >= (TEMP_MAP_ADDR >> 12))
1018 gaPageTable[ i ] = 0;
1024 * \fn tVAddr MM_MapHWPages(tPAddr PAddr, Uint Number)
1025 * \brief Allocates a contigous number of pages
1027 tVAddr MM_MapHWPages(tPAddr PAddr, Uint Number)
1034 for( i = 0; i < NUM_HW_PAGES; i ++ )
1036 // Check if addr used
1037 if( gaPageTable[ (HW_MAP_ADDR >> 12) + i ] & 1 )
1040 // Check possible region
1041 for( j = 0; j < Number && i + j < NUM_HW_PAGES; j ++ )
1043 // If there is an allocated page in the region we are testing, break
1044 if( gaPageTable[ (HW_MAP_ADDR >> 12) + i + j ] & 1 ) break;
1050 for( j = 0; j < Number; j++ ) {
1051 MM_RefPhys( PAddr + (j<<12) );
1052 gaPageTable[ (HW_MAP_ADDR >> 12) + i + j ] = (PAddr + (j<<12)) | 3;
1054 return HW_MAP_ADDR + (i<<12);
1057 // If we don't find any, return NULL
1062 * \fn tVAddr MM_AllocDMA(int Pages, int MaxBits, tPAddr *PhysAddr)
1063 * \brief Allocates DMA physical memory
1064 * \param Pages Number of pages required
1065 * \param MaxBits Maximum number of bits the physical address can have
1066 * \param PhysAddr Pointer to the location to place the physical address allocated
1067 * \return Virtual address allocate
1069 tVAddr MM_AllocDMA(int Pages, int MaxBits, tPAddr *PhysAddr)
1071 tPAddr maxCheck = (1 << MaxBits);
1075 ENTER("iPages iMaxBits pPhysAddr", Pages, MaxBits, PhysAddr);
1078 if(MaxBits < 12 || !PhysAddr) {
1084 if(MaxBits >= PHYS_BITS) maxCheck = -1;
1087 if(Pages == 1 && MaxBits >= PHYS_BITS)
1089 phys = MM_AllocPhys();
1095 ret = MM_MapHWPages(phys, 1);
1106 phys = MM_AllocPhysRange(Pages, MaxBits);
1107 // - Was it allocated?
1113 // Allocated successfully, now map
1114 ret = MM_MapHWPages(phys, Pages);
1116 // If it didn't map, free then return 0
1117 for(;Pages--;phys+=0x1000)
1129 * \fn void MM_UnmapHWPages(tVAddr VAddr, Uint Number)
1130 * \brief Unmap a hardware page
1132 void MM_UnmapHWPages(tVAddr VAddr, Uint Number)
1136 //Log_Debug("VirtMem", "MM_UnmapHWPages: (VAddr=0x%08x, Number=%i)", VAddr, Number);
1139 if(VAddr < HW_MAP_ADDR || VAddr+Number*0x1000 > HW_MAP_MAX) return;
1143 Mutex_Acquire( &glTempMappings ); // Temp and HW share a directory, so they share a lock
1145 for( j = 0; j < Number; j++ )
1147 MM_DerefPhys( gaPageTable[ i + j ] & ~0xFFF );
1148 gaPageTable[ i + j ] = 0;
1151 Mutex_Release( &glTempMappings );