2 * AcessOS Microkernel Version
15 #define DEBUG_TRACE_SWITCH 0
18 #define SWITCH_MAGIC 0xFFFACE55 // There is no code in this area
20 #define TIMER_DIVISOR 11931 //~100Hz
25 extern void APStartup(void); // 16-bit AP startup code
26 extern Uint GetEIP(void); // start.asm
27 extern int GetCPUNum(void); // start.asm
28 extern Uint32 gaInitPageDir[1024]; // start.asm
29 extern void Kernel_Stack_Top;
30 extern tSpinlock glThreadListLock;
33 extern int giTotalTickets;
34 extern int giNumActiveThreads;
35 extern tThread gThreadZero;
36 extern tThread *gActiveThreads;
37 extern tThread *gSleepingThreads;
38 extern tThread *gDeleteThreads;
39 extern tThread *Threads_GetNextToRun(int CPU);
40 extern void Threads_Dump(void);
41 extern tThread *Threads_CloneTCB(Uint *Err, Uint Flags);
42 extern void Isr8(void); // Double Fault
43 extern void Proc_ReturnToUser(void);
46 void ArchThreads_Init(void);
48 void MP_StartAP(int CPU);
49 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
51 void Proc_Start(void);
52 tThread *Proc_GetCurThread(void);
53 void Proc_ChangeStack(void);
54 int Proc_Clone(Uint *Err, Uint Flags);
55 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP);
56 void Proc_CallFaultHandler(tThread *Thread);
57 void Proc_Scheduler(int CPU);
60 // --- Multiprocessing ---
62 volatile int giNumInitingCPUs = 0;
63 tMPInfo *gMPFloatPtr = NULL;
64 tAPIC *gpMP_LocalAPIC = NULL;
65 Uint8 gaAPIC_to_CPU[256] = {0};
66 tCPU gaCPUs[MAX_CPUS];
68 tThread *gCurrentThread = NULL;
71 Uint32 *gPML4s[4] = NULL;
75 // --- Error Recovery ---
76 char gaDoubleFaultStack[1024];
77 tTSS gDoubleFault_TSS = {
78 .ESP0 = (Uint)&gaDoubleFaultStack[1023],
80 .CR3 = (Uint)gaInitPageDir - KERNEL_BASE,
82 .ESP = (Uint)&gaDoubleFaultStack[1023],
83 .CS = 0x08, .SS = 0x10,
84 .DS = 0x10, .ES = 0x10,
85 .FS = 0x10, .GS = 0x10,
90 * \fn void ArchThreads_Init(void)
91 * \brief Starts the process scheduler
93 void ArchThreads_Init(void)
100 // Mark BSP as active
103 // -- Initialise Multiprocessing
104 // Find MP Floating Table
105 // - EBDA/Last 1Kib (640KiB)
106 for(pos = KERNEL_BASE|0x9F000; pos < (KERNEL_BASE|0xA0000); pos += 16) {
107 if( *(Uint*)(pos) == MPPTR_IDENT ) {
108 Log("Possible %p", pos);
109 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
110 gMPFloatPtr = (void*)pos;
114 // - Last KiB (512KiB base mem)
116 for(pos = KERNEL_BASE|0x7F000; pos < (KERNEL_BASE|0x80000); pos += 16) {
117 if( *(Uint*)(pos) == MPPTR_IDENT ) {
118 Log("Possible %p", pos);
119 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
120 gMPFloatPtr = (void*)pos;
127 for(pos = KERNEL_BASE|0xE0000; pos < (KERNEL_BASE|0x100000); pos += 16) {
128 if( *(Uint*)(pos) == MPPTR_IDENT ) {
129 Log("Possible %p", pos);
130 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
131 gMPFloatPtr = (void*)pos;
137 // If the MP Table Exists, parse it
142 Log("gMPFloatPtr = %p", gMPFloatPtr);
143 Log("*gMPFloatPtr = {");
144 Log("\t.Sig = 0x%08x", gMPFloatPtr->Sig);
145 Log("\t.MPConfig = 0x%08x", gMPFloatPtr->MPConfig);
146 Log("\t.Length = 0x%02x", gMPFloatPtr->Length);
147 Log("\t.Version = 0x%02x", gMPFloatPtr->Version);
148 Log("\t.Checksum = 0x%02x", gMPFloatPtr->Checksum);
149 Log("\t.Features = [0x%02x,0x%02x,0x%02x,0x%02x,0x%02x]",
150 gMPFloatPtr->Features[0], gMPFloatPtr->Features[1],
151 gMPFloatPtr->Features[2], gMPFloatPtr->Features[3],
152 gMPFloatPtr->Features[4]
156 mptable = (void*)( KERNEL_BASE|gMPFloatPtr->MPConfig );
157 Log("mptable = %p", mptable);
159 Log("\t.Sig = 0x%08x", mptable->Sig);
160 Log("\t.BaseTableLength = 0x%04x", mptable->BaseTableLength);
161 Log("\t.SpecRev = 0x%02x", mptable->SpecRev);
162 Log("\t.Checksum = 0x%02x", mptable->Checksum);
163 Log("\t.OEMID = '%8c'", mptable->OemID);
164 Log("\t.ProductID = '%8c'", mptable->ProductID);
165 Log("\t.OEMTablePtr = %p'", mptable->OEMTablePtr);
166 Log("\t.OEMTableSize = 0x%04x", mptable->OEMTableSize);
167 Log("\t.EntryCount = 0x%04x", mptable->EntryCount);
168 Log("\t.LocalAPICMemMap = 0x%08x", mptable->LocalAPICMemMap);
169 Log("\t.ExtendedTableLen = 0x%04x", mptable->ExtendedTableLen);
170 Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum);
173 gpMP_LocalAPIC = (void*)MM_MapHWPage(mptable->LocalAPICMemMap, 1);
175 ents = mptable->Entries;
178 for( i = 0; i < mptable->EntryCount; i ++ )
185 Log("%i: Processor", i);
186 Log("\t.APICID = %i", ents->Proc.APICID);
187 Log("\t.APICVer = 0x%02x", ents->Proc.APICVer);
188 Log("\t.CPUFlags = 0x%02x", ents->Proc.CPUFlags);
189 Log("\t.CPUSignature = 0x%08x", ents->Proc.CPUSignature);
190 Log("\t.FeatureFlags = 0x%08x", ents->Proc.FeatureFlags);
193 if( !(ents->Proc.CPUFlags & 1) ) {
198 // Check if there is too many processors
199 if(giNumCPUs >= MAX_CPUS) {
200 giNumCPUs ++; // If `giNumCPUs` > MAX_CPUS later, it will be clipped
204 // Initialise CPU Info
205 gaAPIC_to_CPU[ents->Proc.APICID] = giNumCPUs;
206 gaCPUs[giNumCPUs].APICID = ents->Proc.APICID;
207 gaCPUs[giNumCPUs].State = 0;
211 if( !(ents->Proc.CPUFlags & 2) )
213 MP_StartAP( giNumCPUs-1 );
220 Log("\t.ID = %i", ents->Bus.ID);
221 Log("\t.TypeString = '%6c'", ents->Bus.TypeString);
225 Log("%i: I/O APIC", i);
226 Log("\t.ID = %i", ents->IOAPIC.ID);
227 Log("\t.Version = 0x%02x", ents->IOAPIC.Version);
228 Log("\t.Flags = 0x%02x", ents->IOAPIC.Flags);
229 Log("\t.Addr = 0x%08x", ents->IOAPIC.Addr);
231 case 3: // I/O Interrupt Assignment
233 Log("%i: I/O Interrupt Assignment", i);
234 Log("\t.IntType = %i", ents->IOInt.IntType);
235 Log("\t.Flags = 0x%04x", ents->IOInt.Flags);
236 Log("\t.SourceBusID = 0x%02x", ents->IOInt.SourceBusID);
237 Log("\t.SourceBusIRQ = 0x%02x", ents->IOInt.SourceBusIRQ);
238 Log("\t.DestAPICID = 0x%02x", ents->IOInt.DestAPICID);
239 Log("\t.DestAPICIRQ = 0x%02x", ents->IOInt.DestAPICIRQ);
241 case 4: // Local Interrupt Assignment
243 Log("%i: Local Interrupt Assignment", i);
244 Log("\t.IntType = %i", ents->LocalInt.IntType);
245 Log("\t.Flags = 0x%04x", ents->LocalInt.Flags);
246 Log("\t.SourceBusID = 0x%02x", ents->LocalInt.SourceBusID);
247 Log("\t.SourceBusIRQ = 0x%02x", ents->LocalInt.SourceBusIRQ);
248 Log("\t.DestLocalAPICID = 0x%02x", ents->LocalInt.DestLocalAPICID);
249 Log("\t.DestLocalAPICIRQ = 0x%02x", ents->LocalInt.DestLocalAPICIRQ);
252 Log("%i: Unknown (%i)", i, ents->Type);
255 ents = (void*)( (Uint)ents + entSize );
258 if( giNumCPUs > MAX_CPUS ) {
259 Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS);
260 giNumCPUs = MAX_CPUS;
263 while( giNumInitingCPUs )
264 MM_FinishVirtualInit();
266 Panic("Uh oh... MP Table Parsing is unimplemented\n");
269 Log("No MP Table was found, assuming uniprocessor\n");
276 MM_FinishVirtualInit();
279 // Initialise Double Fault TSS
281 gGDT[5].LimitLow = sizeof(tTSS);
283 gGDT[5].Access = 0x89; // Type
286 gGDT[5].BaseLow = (Uint)&gDoubleFault_TSS & 0xFFFF;
287 gGDT[5].BaseMid = (Uint)&gDoubleFault_TSS >> 16;
288 gGDT[5].BaseHi = (Uint)&gDoubleFault_TSS >> 24;
290 Log_Debug("Proc", "gIDT[8] = {OffsetLo:%04x, CS:%04x, Flags:%04x, OffsetHi:%04x}",
291 gIDT[8].OffsetLo, gIDT[8].CS, gIDT[8].Flags, gIDT[8].OffsetHi);
292 gIDT[8].OffsetLo = 0;
294 gIDT[8].Flags = 0x8500;
295 gIDT[8].OffsetHi = 0;
296 Log_Debug("Proc", "gIDT[8] = {OffsetLo:%04x, CS:%04x, Flags:%04x, OffsetHi:%04x}",
297 gIDT[8].OffsetLo, gIDT[8].CS, gIDT[8].Flags, gIDT[8].OffsetHi);
299 //__asm__ __volatile__ ("xchg %bx, %bx");
302 // Initialise Normal TSS(s)
303 for(pos=0;pos<giNumCPUs;pos++)
308 gTSSs[pos].SS0 = 0x10;
309 gTSSs[pos].ESP0 = 0; // Set properly by scheduler
310 gGDT[6+pos].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
311 gGDT[6+pos].BaseMid = ((Uint)(&gTSSs[pos])) >> 16;
312 gGDT[6+pos].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
315 for(pos=0;pos<giNumCPUs;pos++) {
317 __asm__ __volatile__ ("ltr %%ax"::"a"(0x30+pos*8));
323 gaCPUs[0].Current = &gThreadZero;
325 gCurrentThread = &gThreadZero;
329 gThreadZero.MemState.PDP[0] = 0;
330 gThreadZero.MemState.PDP[1] = 0;
331 gThreadZero.MemState.PDP[2] = 0;
333 gThreadZero.MemState.CR3 = (Uint)gaInitPageDir - KERNEL_BASE;
336 // Set timer frequency
337 outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator
338 outb(0x40, TIMER_DIVISOR&0xFF); // Low Byte of Divisor
339 outb(0x40, (TIMER_DIVISOR>>8)&0xFF); // High Byte
341 // Create Per-Process Data Block
342 MM_Allocate(MM_PPD_CFG);
349 void MP_StartAP(int CPU)
351 Log("Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID);
352 // Set location of AP startup code and mark for a warm restart
353 *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0);
354 *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
355 outb(0x70, 0x0F); outb(0x71, 0x0A); // Warm Reset
356 MP_SendIPI(gaCPUs[CPU].APICID, 0, 5);
360 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
362 Uint32 addr = (Uint)gpMP_LocalAPIC + 0x300;
366 val = (Uint)APICID << 24;
367 Log("*%p = 0x%08x", addr+0x10, val);
368 *(Uint32*)(addr+0x10) = val;
370 val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF);
371 Log("*%p = 0x%08x", addr, val);
372 *(Uint32*)addr = val;
377 * \fn void Proc_Start(void)
378 * \brief Start process scheduler
380 void Proc_Start(void)
382 // Start Interrupts (and hence scheduler)
383 __asm__ __volatile__("sti");
387 * \fn tThread *Proc_GetCurThread(void)
388 * \brief Gets the current thread
390 tThread *Proc_GetCurThread(void)
393 //return gaCPUs[ gaAPIC_to_CPU[gpMP_LocalAPIC->ID.Val&0xFF] ].Current;
394 return gaCPUs[ GetCPUNum() ].Current;
396 return gCurrentThread;
401 * \fn void Proc_ChangeStack(void)
402 * \brief Swaps the current stack for a new one (in the proper stack reigon)
404 void Proc_ChangeStack(void)
408 Uint curBase, newBase;
410 __asm__ __volatile__ ("mov %%esp, %0":"=r"(esp));
411 __asm__ __volatile__ ("mov %%ebp, %0":"=r"(ebp));
416 newBase = MM_NewKStack();
419 Panic("What the?? Unable to allocate space for initial kernel stack");
423 curBase = (Uint)&Kernel_Stack_Top;
425 LOG("curBase = 0x%x, newBase = 0x%x", curBase, newBase);
427 // Get ESP as a used size
429 LOG("memcpy( %p, %p, 0x%x )", (void*)(newBase - esp), (void*)(curBase - esp), esp );
431 memcpy( (void*)(newBase - esp), (void*)(curBase - esp), esp );
432 // Get ESP as an offset in the new stack
435 ebp = newBase - (curBase - ebp);
437 // Repair EBPs & Stack Addresses
438 // Catches arguments also, but may trash stack-address-like values
439 for(tmpEbp = esp; tmpEbp < newBase; tmpEbp += 4)
441 if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < curBase)
442 *(Uint*)tmpEbp += newBase - curBase;
445 Proc_GetCurThread()->KernelStack = newBase;
447 __asm__ __volatile__ ("mov %0, %%esp"::"r"(esp));
448 __asm__ __volatile__ ("mov %0, %%ebp"::"r"(ebp));
452 * \fn int Proc_Clone(Uint *Err, Uint Flags)
453 * \brief Clone the current process
455 int Proc_Clone(Uint *Err, Uint Flags)
458 tThread *cur = Proc_GetCurThread();
461 __asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
462 __asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
464 newThread = Threads_CloneTCB(Err, Flags);
465 if(!newThread) return -1;
467 // Initialise Memory Space (New Addr space or kernel stack)
468 if(Flags & CLONE_VM) {
469 newThread->MemState.CR3 = MM_Clone();
470 newThread->KernelStack = cur->KernelStack;
472 Uint tmpEbp, oldEsp = esp;
475 newThread->MemState.CR3 = cur->MemState.CR3;
478 newThread->KernelStack = MM_NewKStack();
480 if(newThread->KernelStack == 0) {
485 // Get ESP as a used size
486 esp = cur->KernelStack - esp;
488 memcpy( (void*)(newThread->KernelStack - esp), (void*)(cur->KernelStack - esp), esp );
489 // Get ESP as an offset in the new stack
490 esp = newThread->KernelStack - esp;
492 ebp = newThread->KernelStack - (cur->KernelStack - ebp);
494 // Repair EBPs & Stack Addresses
495 // Catches arguments also, but may trash stack-address-like values
496 for(tmpEbp = esp; tmpEbp < newThread->KernelStack; tmpEbp += 4)
498 if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < cur->KernelStack)
499 *(Uint*)tmpEbp += newThread->KernelStack - cur->KernelStack;
503 // Save core machine state
504 newThread->SavedState.ESP = esp;
505 newThread->SavedState.EBP = ebp;
507 if(eip == SWITCH_MAGIC) {
508 outb(0x20, 0x20); // ACK Timer and return as child
513 newThread->SavedState.EIP = eip;
515 // Lock list and add to active
516 Threads_AddActive(newThread);
518 return newThread->TID;
522 * \fn int Proc_SpawnWorker(void)
523 * \brief Spawns a new worker thread
525 int Proc_SpawnWorker(void)
530 cur = Proc_GetCurThread();
533 new = malloc( sizeof(tThread) );
535 Warning("Proc_SpawnWorker - Out of heap space!\n");
538 memcpy(new, &gThreadZero, sizeof(tThread));
540 new->TID = giNextTID++;
541 // Create a new worker stack (in PID0's address space)
542 // The stack is relocated by this code
543 new->KernelStack = MM_NewWorkerStack();
545 // Get ESP and EBP based in the new stack
546 __asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
547 __asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
548 esp = new->KernelStack - (cur->KernelStack - esp);
549 ebp = new->KernelStack - (cur->KernelStack - ebp);
551 // Save core machine state
552 new->SavedState.ESP = esp;
553 new->SavedState.EBP = ebp;
555 if(eip == SWITCH_MAGIC) {
556 outb(0x20, 0x20); // ACK Timer and return as child
561 new->SavedState.EIP = eip;
563 new->Status = THREAD_STAT_ACTIVE;
564 Threads_AddActive( new );
570 * \fn Uint Proc_MakeUserStack(void)
571 * \brief Creates a new user stack
573 Uint Proc_MakeUserStack(void)
576 Uint base = USER_STACK_TOP - USER_STACK_SZ;
578 // Check Prospective Space
579 for( i = USER_STACK_SZ >> 12; i--; )
580 if( MM_GetPhysAddr( base + (i<<12) ) != 0 )
583 if(i != -1) return 0;
585 // Allocate Stack - Allocate incrementally to clean up MM_Dump output
586 for( i = 0; i < USER_STACK_SZ/0x1000; i++ )
587 MM_Allocate( base + (i<<12) );
589 return base + USER_STACK_SZ;
593 * \fn void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
594 * \brief Starts a user task
596 void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
598 Uint *stack = (void*)Proc_MakeUserStack();
603 //Log("stack = %p", stack);
606 stack -= DataSize/sizeof(*stack);
607 memcpy( stack, ArgV, DataSize );
609 //Log("stack = %p", stack);
613 // Adjust Arguments and environment
614 delta = (Uint)stack - (Uint)ArgV;
615 ArgV = (char**)stack;
616 for( i = 0; ArgV[i]; i++ )
620 // Do we care about EnvP?
623 for( i = 0; EnvP[i]; i++ )
628 // User Mode Segments
629 ss = 0x23; cs = 0x1B;
632 *--stack = (Uint)EnvP;
633 *--stack = (Uint)ArgV;
634 *--stack = (Uint)ArgC;
637 *--stack = 0; // Return Address
639 Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
642 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
644 Uint *stack = (void*)Stack;
645 *--stack = SS; //Stack Segment
646 *--stack = Stack; //Stack Pointer
647 *--stack = Flags; //EFLAGS (Resvd (0x2) and IF (0x20))
648 *--stack = CS; //Code Segment
651 *--stack = 0xAAAAAAAA; // eax
652 *--stack = 0xCCCCCCCC; // ecx
653 *--stack = 0xDDDDDDDD; // edx
654 *--stack = 0xBBBBBBBB; // ebx
655 *--stack = 0xD1D1D1D1; // edi
656 *--stack = 0x54545454; // esp - NOT POPED
657 *--stack = 0x51515151; // esi
658 *--stack = 0xB4B4B4B4; // ebp
665 __asm__ __volatile__ (
666 "mov %%eax,%%esp;\n\t" // Set stack pointer
672 "iret;\n\t" : : "a" (stack));
677 * \fn int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
678 * \brief Demotes a process to a lower permission level
679 * \param Err Pointer to user's errno
680 * \param Dest New Permission Level
681 * \param Regs Pointer to user's register structure
683 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
685 int cpl = Regs->cs & 3;
687 if(Dest > 3 || Dest < 0) {
698 // Change the Segment Registers
699 Regs->cs = (((Dest+1)<<4) | Dest) - 8;
700 Regs->ss = ((Dest+1)<<4) | Dest;
701 // Check if the GP Segs are GDT, then change them
702 if(!(Regs->ds & 4)) Regs->ds = ((Dest+1)<<4) | Dest;
703 if(!(Regs->es & 4)) Regs->es = ((Dest+1)<<4) | Dest;
704 if(!(Regs->fs & 4)) Regs->fs = ((Dest+1)<<4) | Dest;
705 if(!(Regs->gs & 4)) Regs->gs = ((Dest+1)<<4) | Dest;
711 * \brief Calls a signal handler in user mode
712 * \note Used for signals
714 void Proc_CallFaultHandler(tThread *Thread)
716 // Rewinds the stack and calls the user function
718 __asm__ __volatile__ ("mov %0, %%ebp;\n\tcall Proc_ReturnToUser" :: "r"(Thread->FaultHandler));
723 * \fn void Proc_Scheduler(int CPU)
724 * \brief Swap current thread and clears dead threads
726 void Proc_Scheduler(int CPU)
731 // If the spinlock is set, let it complete
732 if(IS_LOCKED(&glThreadListLock)) return;
734 // Clear Delete Queue
735 while(gDeleteThreads)
737 thread = gDeleteThreads->Next;
738 if(gDeleteThreads->IsLocked) { // Only free if structure is unused
739 gDeleteThreads->Status = THREAD_STAT_NULL;
740 free( gDeleteThreads );
742 gDeleteThreads = thread;
745 // Check if there is any tasks running
746 if(giNumActiveThreads == 0) {
747 Log("No Active threads, sleeping");
748 __asm__ __volatile__ ("hlt");
752 // Get current thread
754 thread = gaCPUs[CPU].Current;
756 thread = gCurrentThread;
759 // Reduce remaining quantum and continue timeslice if non-zero
760 if(thread->Remaining--) return;
761 // Reset quantum for next call
762 thread->Remaining = thread->Quantum;
765 __asm__ __volatile__ ("mov %%esp, %0":"=r"(esp));
766 __asm__ __volatile__ ("mov %%ebp, %0":"=r"(ebp));
768 if(eip == SWITCH_MAGIC) return; // Check if a switch happened
770 // Save machine state
771 thread->SavedState.ESP = esp;
772 thread->SavedState.EBP = ebp;
773 thread->SavedState.EIP = eip;
776 thread = Threads_GetNextToRun(CPU);
780 Warning("Hmm... Threads_GetNextToRun returned NULL, I don't think this should happen.\n");
784 #if DEBUG_TRACE_SWITCH
785 Log("Switching to task %i, CR3 = 0x%x, EIP = %p",
787 thread->MemState.CR3,
788 thread->SavedState.EIP
792 // Set current thread
794 gaCPUs[CPU].Current = thread;
796 gCurrentThread = thread;
799 // Update Kernel Stack pointer
800 gTSSs[CPU].ESP0 = thread->KernelStack-4;
804 # error "Todo: Implement PAE Address space switching"
806 __asm__ __volatile__ ("mov %0, %%cr3"::"a"(thread->MemState.CR3));
810 if(thread->SavedState.ESP > 0xC0000000
811 && thread->SavedState.ESP < thread->KernelStack-0x2000) {
812 Log_Warning("Proc", "Possible bad ESP %p (PID %i)", thread->SavedState.ESP);
817 __asm__ __volatile__ (
818 "mov %1, %%esp\n\t" // Restore ESP
819 "mov %2, %%ebp\n\t" // and EBP
820 "jmp *%3" : : // And return to where we saved state (Proc_Clone or Proc_Scheduler)
821 "a"(SWITCH_MAGIC), "b"(thread->SavedState.ESP),
822 "d"(thread->SavedState.EBP), "c"(thread->SavedState.EIP)
824 for(;;); // Shouldn't reach here
828 EXPORT(Proc_SpawnWorker);