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 Uint32 gaInitPageDir[1024]; // start.asm
28 extern void Kernel_Stack_Top;
29 extern tSpinlock glThreadListLock;
32 extern int giTotalTickets;
33 extern int giNumActiveThreads;
34 extern tThread gThreadZero;
35 extern tThread *gActiveThreads;
36 extern tThread *gSleepingThreads;
37 extern tThread *gDeleteThreads;
38 extern tThread *Threads_GetNextToRun(int CPU);
39 extern void Threads_Dump(void);
40 extern tThread *Threads_CloneTCB(Uint *Err, Uint Flags);
41 extern void Isr8(void); // Double Fault
42 extern void Proc_ReturnToUser(void);
45 void ArchThreads_Init(void);
47 void MP_StartAP(int CPU);
48 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
50 void Proc_Start(void);
51 tThread *Proc_GetCurThread(void);
52 void Proc_ChangeStack(void);
53 int Proc_Clone(Uint *Err, Uint Flags);
54 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP);
55 void Proc_CallFaultHandler(tThread *Thread);
56 void Proc_Scheduler(int CPU);
59 // --- Multiprocessing ---
61 volatile int giNumInitingCPUs = 0;
62 tMPInfo *gMPFloatPtr = NULL;
63 tAPIC *gpMP_LocalAPIC = NULL;
64 Uint8 gaAPIC_to_CPU[256] = {0};
65 tCPU gaCPUs[MAX_CPUS];
67 tThread *gCurrentThread = NULL;
70 Uint32 *gPML4s[4] = NULL;
74 // --- Error Recovery ---
75 char gaDoubleFaultStack[1024];
76 tTSS gDoubleFault_TSS = {
77 .ESP0 = (Uint)&gaDoubleFaultStack[1023],
79 .CR3 = (Uint)gaInitPageDir - KERNEL_BASE,
81 .ESP = (Uint)&gaDoubleFaultStack[1023],
82 .CS = 0x08, .SS = 0x10,
83 .DS = 0x10, .ES = 0x10,
84 .FS = 0x10, .GS = 0x10,
89 * \fn void ArchThreads_Init(void)
90 * \brief Starts the process scheduler
92 void ArchThreads_Init(void)
102 // -- Initialise Multiprocessing
103 // Find MP Floating Table
104 // - EBDA/Last 1Kib (640KiB)
105 for(pos = KERNEL_BASE|0x9F000; pos < (KERNEL_BASE|0xA0000); pos += 16) {
106 if( *(Uint*)(pos) == MPPTR_IDENT ) {
107 Log("Possible %p", pos);
108 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
109 gMPFloatPtr = (void*)pos;
113 // - Last KiB (512KiB base mem)
115 for(pos = KERNEL_BASE|0x7F000; pos < (KERNEL_BASE|0x80000); pos += 16) {
116 if( *(Uint*)(pos) == MPPTR_IDENT ) {
117 Log("Possible %p", pos);
118 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
119 gMPFloatPtr = (void*)pos;
126 for(pos = KERNEL_BASE|0xE0000; pos < (KERNEL_BASE|0x100000); pos += 16) {
127 if( *(Uint*)(pos) == MPPTR_IDENT ) {
128 Log("Possible %p", pos);
129 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
130 gMPFloatPtr = (void*)pos;
136 // If the MP Table Exists, parse it
141 Log("gMPFloatPtr = %p", gMPFloatPtr);
142 Log("*gMPFloatPtr = {");
143 Log("\t.Sig = 0x%08x", gMPFloatPtr->Sig);
144 Log("\t.MPConfig = 0x%08x", gMPFloatPtr->MPConfig);
145 Log("\t.Length = 0x%02x", gMPFloatPtr->Length);
146 Log("\t.Version = 0x%02x", gMPFloatPtr->Version);
147 Log("\t.Checksum = 0x%02x", gMPFloatPtr->Checksum);
148 Log("\t.Features = [0x%02x,0x%02x,0x%02x,0x%02x,0x%02x]",
149 gMPFloatPtr->Features[0], gMPFloatPtr->Features[1],
150 gMPFloatPtr->Features[2], gMPFloatPtr->Features[3],
151 gMPFloatPtr->Features[4]
155 mptable = (void*)( KERNEL_BASE|gMPFloatPtr->MPConfig );
156 Log("mptable = %p", mptable);
158 Log("\t.Sig = 0x%08x", mptable->Sig);
159 Log("\t.BaseTableLength = 0x%04x", mptable->BaseTableLength);
160 Log("\t.SpecRev = 0x%02x", mptable->SpecRev);
161 Log("\t.Checksum = 0x%02x", mptable->Checksum);
162 Log("\t.OEMID = '%8c'", mptable->OemID);
163 Log("\t.ProductID = '%8c'", mptable->ProductID);
164 Log("\t.OEMTablePtr = %p'", mptable->OEMTablePtr);
165 Log("\t.OEMTableSize = 0x%04x", mptable->OEMTableSize);
166 Log("\t.EntryCount = 0x%04x", mptable->EntryCount);
167 Log("\t.LocalAPICMemMap = 0x%08x", mptable->LocalAPICMemMap);
168 Log("\t.ExtendedTableLen = 0x%04x", mptable->ExtendedTableLen);
169 Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum);
172 gpMP_LocalAPIC = (void*)MM_MapHWPage(mptable->LocalAPICMemMap, 1);
174 ents = mptable->Entries;
177 for( i = 0; i < mptable->EntryCount; i ++ )
184 Log("%i: Processor", i);
185 Log("\t.APICID = %i", ents->Proc.APICID);
186 Log("\t.APICVer = 0x%02x", ents->Proc.APICVer);
187 Log("\t.CPUFlags = 0x%02x", ents->Proc.CPUFlags);
188 Log("\t.CPUSignature = 0x%08x", ents->Proc.CPUSignature);
189 Log("\t.FeatureFlags = 0x%08x", ents->Proc.FeatureFlags);
192 if( !(ents->Proc.CPUFlags & 1) ) {
197 // Check if there is too many processors
198 if(giNumCPUs >= MAX_CPUS) {
199 giNumCPUs ++; // If `giNumCPUs` > MAX_CPUS later, it will be clipped
203 // Initialise CPU Info
204 gaAPIC_to_CPU[ents->Proc.APICID] = giNumCPUs;
205 gaCPUs[giNumCPUs].APICID = ents->Proc.APICID;
206 gaCPUs[giNumCPUs].State = 0;
210 if( !(ents->Proc.CPUFlags & 2) )
212 MP_StartAP( giNumCPUs-1 );
219 Log("\t.ID = %i", ents->Bus.ID);
220 Log("\t.TypeString = '%6c'", ents->Bus.TypeString);
224 Log("%i: I/O APIC", i);
225 Log("\t.ID = %i", ents->IOAPIC.ID);
226 Log("\t.Version = 0x%02x", ents->IOAPIC.Version);
227 Log("\t.Flags = 0x%02x", ents->IOAPIC.Flags);
228 Log("\t.Addr = 0x%08x", ents->IOAPIC.Addr);
230 case 3: // I/O Interrupt Assignment
232 Log("%i: I/O Interrupt Assignment", i);
233 Log("\t.IntType = %i", ents->IOInt.IntType);
234 Log("\t.Flags = 0x%04x", ents->IOInt.Flags);
235 Log("\t.SourceBusID = 0x%02x", ents->IOInt.SourceBusID);
236 Log("\t.SourceBusIRQ = 0x%02x", ents->IOInt.SourceBusIRQ);
237 Log("\t.DestAPICID = 0x%02x", ents->IOInt.DestAPICID);
238 Log("\t.DestAPICIRQ = 0x%02x", ents->IOInt.DestAPICIRQ);
240 case 4: // Local Interrupt Assignment
242 Log("%i: Local Interrupt Assignment", i);
243 Log("\t.IntType = %i", ents->LocalInt.IntType);
244 Log("\t.Flags = 0x%04x", ents->LocalInt.Flags);
245 Log("\t.SourceBusID = 0x%02x", ents->LocalInt.SourceBusID);
246 Log("\t.SourceBusIRQ = 0x%02x", ents->LocalInt.SourceBusIRQ);
247 Log("\t.DestLocalAPICID = 0x%02x", ents->LocalInt.DestLocalAPICID);
248 Log("\t.DestLocalAPICIRQ = 0x%02x", ents->LocalInt.DestLocalAPICIRQ);
251 Log("%i: Unknown (%i)", i, ents->Type);
254 ents = (void*)( (Uint)ents + entSize );
257 if( giNumCPUs > MAX_CPUS ) {
258 Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS);
259 giNumCPUs = MAX_CPUS;
262 while( giNumInitingCPUs )
263 MM_FinishVirtualInit();
265 Panic("Uh oh... MP Table Parsing is unimplemented\n");
268 Log("No MP Table was found, assuming uniprocessor\n");
275 MM_FinishVirtualInit();
278 // Initialise Double Fault TSS
280 gGDT[5].LimitLow = sizeof(tTSS);
282 gGDT[5].Access = 0x89; // Type
285 gGDT[5].BaseLow = (Uint)&gDoubleFault_TSS & 0xFFFF;
286 gGDT[5].BaseMid = (Uint)&gDoubleFault_TSS >> 16;
287 gGDT[5].BaseHi = (Uint)&gDoubleFault_TSS >> 24;
289 Log_Debug("Proc", "gIDT[8] = {OffsetLo:%04x, CS:%04x, Flags:%04x, OffsetHi:%04x}",
290 gIDT[8].OffsetLo, gIDT[8].CS, gIDT[8].Flags, gIDT[8].OffsetHi);
291 gIDT[8].OffsetLo = 0;
293 gIDT[8].Flags = 0x8500;
294 gIDT[8].OffsetHi = 0;
295 Log_Debug("Proc", "gIDT[8] = {OffsetLo:%04x, CS:%04x, Flags:%04x, OffsetHi:%04x}",
296 gIDT[8].OffsetLo, gIDT[8].CS, gIDT[8].Flags, gIDT[8].OffsetHi);
298 //__asm__ __volatile__ ("xchg %bx, %bx");
301 // Initialise Normal TSS(s)
302 for(pos=0;pos<giNumCPUs;pos++)
307 gTSSs[pos].SS0 = 0x10;
308 gTSSs[pos].ESP0 = 0; // Set properly by scheduler
309 gGDT[6+pos].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
310 gGDT[6+pos].BaseMid = ((Uint)(&gTSSs[pos])) >> 16;
311 gGDT[6+pos].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
314 for(pos=0;pos<giNumCPUs;pos++) {
316 __asm__ __volatile__ ("ltr %%ax"::"a"(0x30+pos*8));
322 gaCPUs[0].Current = &gThreadZero;
324 gCurrentThread = &gThreadZero;
328 gThreadZero.MemState.PDP[0] = 0;
329 gThreadZero.MemState.PDP[1] = 0;
330 gThreadZero.MemState.PDP[2] = 0;
332 gThreadZero.MemState.CR3 = (Uint)gaInitPageDir - KERNEL_BASE;
335 // Set timer frequency
336 outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator
337 outb(0x40, TIMER_DIVISOR&0xFF); // Low Byte of Divisor
338 outb(0x40, (TIMER_DIVISOR>>8)&0xFF); // High Byte
340 // Create Per-Process Data Block
341 MM_Allocate(MM_PPD_CFG);
348 void MP_StartAP(int CPU)
350 Log("Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID);
351 // Set location of AP startup code and mark for a warm restart
352 *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0);
353 *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
354 outb(0x70, 0x0F); outb(0x71, 0x0A); // Warm Reset
355 MP_SendIPI(gaCPUs[CPU].APICID, 0, 5);
359 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
361 Uint32 addr = (Uint)gpMP_LocalAPIC + 0x300;
365 val = (Uint)APICID << 24;
366 Log("*%p = 0x%08x", addr+0x10, val);
367 *(Uint32*)(addr+0x10) = val;
369 val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF);
370 Log("*%p = 0x%08x", addr, val);
371 *(Uint32*)addr = val;
376 * \fn void Proc_Start(void)
377 * \brief Start process scheduler
379 void Proc_Start(void)
381 // Start Interrupts (and hence scheduler)
382 __asm__ __volatile__("sti");
386 * \fn tThread *Proc_GetCurThread(void)
387 * \brief Gets the current thread
389 tThread *Proc_GetCurThread(void)
392 return gaCPUs[ gaAPIC_to_CPU[gpMP_LocalAPIC->ID.Val&0xFF] ].Current;
394 return gCurrentThread;
399 * \fn void Proc_ChangeStack(void)
400 * \brief Swaps the current stack for a new one (in the proper stack reigon)
402 void Proc_ChangeStack(void)
406 Uint curBase, newBase;
408 __asm__ __volatile__ ("mov %%esp, %0":"=r"(esp));
409 __asm__ __volatile__ ("mov %%ebp, %0":"=r"(ebp));
414 newBase = MM_NewKStack();
417 Panic("What the?? Unable to allocate space for initial kernel stack");
421 curBase = (Uint)&Kernel_Stack_Top;
423 LOG("curBase = 0x%x, newBase = 0x%x", curBase, newBase);
425 // Get ESP as a used size
427 LOG("memcpy( %p, %p, 0x%x )", (void*)(newBase - esp), (void*)(curBase - esp), esp );
429 memcpy( (void*)(newBase - esp), (void*)(curBase - esp), esp );
430 // Get ESP as an offset in the new stack
433 ebp = newBase - (curBase - ebp);
435 // Repair EBPs & Stack Addresses
436 // Catches arguments also, but may trash stack-address-like values
437 for(tmpEbp = esp; tmpEbp < newBase; tmpEbp += 4)
439 if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < curBase)
440 *(Uint*)tmpEbp += newBase - curBase;
443 Proc_GetCurThread()->KernelStack = newBase;
445 __asm__ __volatile__ ("mov %0, %%esp"::"r"(esp));
446 __asm__ __volatile__ ("mov %0, %%ebp"::"r"(ebp));
450 * \fn int Proc_Clone(Uint *Err, Uint Flags)
451 * \brief Clone the current process
453 int Proc_Clone(Uint *Err, Uint Flags)
456 tThread *cur = Proc_GetCurThread();
459 __asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
460 __asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
462 newThread = Threads_CloneTCB(Err, Flags);
463 if(!newThread) return -1;
465 // Initialise Memory Space (New Addr space or kernel stack)
466 if(Flags & CLONE_VM) {
467 newThread->MemState.CR3 = MM_Clone();
468 newThread->KernelStack = cur->KernelStack;
470 Uint tmpEbp, oldEsp = esp;
473 newThread->MemState.CR3 = cur->MemState.CR3;
476 newThread->KernelStack = MM_NewKStack();
478 if(newThread->KernelStack == 0) {
483 // Get ESP as a used size
484 esp = cur->KernelStack - esp;
486 memcpy( (void*)(newThread->KernelStack - esp), (void*)(cur->KernelStack - esp), esp );
487 // Get ESP as an offset in the new stack
488 esp = newThread->KernelStack - esp;
490 ebp = newThread->KernelStack - (cur->KernelStack - ebp);
492 // Repair EBPs & Stack Addresses
493 // Catches arguments also, but may trash stack-address-like values
494 for(tmpEbp = esp; tmpEbp < newThread->KernelStack; tmpEbp += 4)
496 if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < cur->KernelStack)
497 *(Uint*)tmpEbp += newThread->KernelStack - cur->KernelStack;
501 // Save core machine state
502 newThread->SavedState.ESP = esp;
503 newThread->SavedState.EBP = ebp;
505 if(eip == SWITCH_MAGIC) {
506 outb(0x20, 0x20); // ACK Timer and return as child
511 newThread->SavedState.EIP = eip;
513 // Lock list and add to active
514 Threads_AddActive(newThread);
516 return newThread->TID;
520 * \fn int Proc_SpawnWorker(void)
521 * \brief Spawns a new worker thread
523 int Proc_SpawnWorker(void)
528 cur = Proc_GetCurThread();
531 new = malloc( sizeof(tThread) );
533 Warning("Proc_SpawnWorker - Out of heap space!\n");
536 memcpy(new, &gThreadZero, sizeof(tThread));
538 new->TID = giNextTID++;
539 // Create a new worker stack (in PID0's address space)
540 // The stack is relocated by this code
541 new->KernelStack = MM_NewWorkerStack();
543 // Get ESP and EBP based in the new stack
544 __asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
545 __asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
546 esp = new->KernelStack - (cur->KernelStack - esp);
547 ebp = new->KernelStack - (cur->KernelStack - ebp);
549 // Save core machine state
550 new->SavedState.ESP = esp;
551 new->SavedState.EBP = ebp;
553 if(eip == SWITCH_MAGIC) {
554 outb(0x20, 0x20); // ACK Timer and return as child
559 new->SavedState.EIP = eip;
561 new->Status = THREAD_STAT_ACTIVE;
562 Threads_AddActive( new );
568 * \fn Uint Proc_MakeUserStack(void)
569 * \brief Creates a new user stack
571 Uint Proc_MakeUserStack(void)
574 Uint base = USER_STACK_TOP - USER_STACK_SZ;
576 // Check Prospective Space
577 for( i = USER_STACK_SZ >> 12; i--; )
578 if( MM_GetPhysAddr( base + (i<<12) ) != 0 )
581 if(i != -1) return 0;
583 // Allocate Stack - Allocate incrementally to clean up MM_Dump output
584 for( i = 0; i < USER_STACK_SZ/4069; i++ )
585 MM_Allocate( base + (i<<12) );
587 return base + USER_STACK_SZ;
591 * \fn void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
592 * \brief Starts a user task
594 void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
596 Uint *stack = (void*)Proc_MakeUserStack();
601 //Log("stack = %p", stack);
604 stack -= DataSize/sizeof(*stack);
605 memcpy( stack, ArgV, DataSize );
607 //Log("stack = %p", stack);
611 // Adjust Arguments and environment
612 delta = (Uint)stack - (Uint)ArgV;
613 ArgV = (char**)stack;
614 for( i = 0; ArgV[i]; i++ )
618 // Do we care about EnvP?
621 for( i = 0; EnvP[i]; i++ )
626 // User Mode Segments
627 ss = 0x23; cs = 0x1B;
630 *--stack = (Uint)EnvP;
631 *--stack = (Uint)ArgV;
632 *--stack = (Uint)ArgC;
635 *--stack = 0; // Return Address
637 Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
640 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
642 Uint *stack = (void*)Stack;
643 *--stack = SS; //Stack Segment
644 *--stack = Stack; //Stack Pointer
645 *--stack = Flags; //EFLAGS (Resvd (0x2) and IF (0x20))
646 *--stack = CS; //Code Segment
649 *--stack = 0xAAAAAAAA; // eax
650 *--stack = 0xCCCCCCCC; // ecx
651 *--stack = 0xDDDDDDDD; // edx
652 *--stack = 0xBBBBBBBB; // ebx
653 *--stack = 0xD1D1D1D1; // edi
654 *--stack = 0x54545454; // esp - NOT POPED
655 *--stack = 0x51515151; // esi
656 *--stack = 0xB4B4B4B4; // ebp
663 __asm__ __volatile__ (
664 "mov %%eax,%%esp;\n\t" // Set stack pointer
670 "iret;\n\t" : : "a" (stack));
675 * \fn int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
676 * \brief Demotes a process to a lower permission level
677 * \param Err Pointer to user's errno
678 * \param Dest New Permission Level
679 * \param Regs Pointer to user's register structure
681 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
683 int cpl = Regs->cs & 3;
685 if(Dest > 3 || Dest < 0) {
696 // Change the Segment Registers
697 Regs->cs = (((Dest+1)<<4) | Dest) - 8;
698 Regs->ss = ((Dest+1)<<4) | Dest;
699 // Check if the GP Segs are GDT, then change them
700 if(!(Regs->ds & 4)) Regs->ds = ((Dest+1)<<4) | Dest;
701 if(!(Regs->es & 4)) Regs->es = ((Dest+1)<<4) | Dest;
702 if(!(Regs->fs & 4)) Regs->fs = ((Dest+1)<<4) | Dest;
703 if(!(Regs->gs & 4)) Regs->gs = ((Dest+1)<<4) | Dest;
709 * \brief Calls a signal handler in user mode
710 * \note Used for signals
712 void Proc_CallFaultHandler(tThread *Thread)
714 // Rewinds the stack and calls the user function
716 __asm__ __volatile__ ("mov %0, %%ebp;\n\tcall Proc_ReturnToUser" :: "r"(Thread->FaultHandler));
721 * \fn void Proc_Scheduler(int CPU)
722 * \brief Swap current thread and clears dead threads
724 void Proc_Scheduler(int CPU)
729 // If the spinlock is set, let it complete
730 if(IS_LOCKED(&glThreadListLock)) return;
732 // Clear Delete Queue
733 while(gDeleteThreads)
735 thread = gDeleteThreads->Next;
736 if(gDeleteThreads->IsLocked) { // Only free if structure is unused
737 gDeleteThreads->Status = THREAD_STAT_NULL;
738 free( gDeleteThreads );
740 gDeleteThreads = thread;
743 // Check if there is any tasks running
744 if(giNumActiveThreads == 0) {
745 Log("No Active threads, sleeping");
746 __asm__ __volatile__ ("hlt");
750 // Get current thread
752 thread = gaCPUs[CPU].Current;
754 thread = gCurrentThread;
757 // Reduce remaining quantum and continue timeslice if non-zero
758 if(thread->Remaining--) return;
759 // Reset quantum for next call
760 thread->Remaining = thread->Quantum;
763 __asm__ __volatile__ ("mov %%esp, %0":"=r"(esp));
764 __asm__ __volatile__ ("mov %%ebp, %0":"=r"(ebp));
766 if(eip == SWITCH_MAGIC) return; // Check if a switch happened
768 // Save machine state
769 thread->SavedState.ESP = esp;
770 thread->SavedState.EBP = ebp;
771 thread->SavedState.EIP = eip;
774 thread = Threads_GetNextToRun(CPU);
778 Warning("Hmm... Threads_GetNextToRun returned NULL, I don't think this should happen.\n");
782 #if DEBUG_TRACE_SWITCH
783 Log("Switching to task %i, CR3 = 0x%x, EIP = %p",
785 thread->MemState.CR3,
786 thread->SavedState.EIP
790 // Set current thread
792 gaCPUs[CPU].Current = thread;
794 gCurrentThread = thread;
797 // Update Kernel Stack pointer
798 gTSSs[CPU].ESP0 = thread->KernelStack-4;
802 # error "Todo: Implement PAE Address space switching"
804 __asm__ __volatile__ ("mov %0, %%cr3"::"a"(thread->MemState.CR3));
808 if(thread->SavedState.ESP > 0xC0000000
809 && thread->SavedState.ESP < thread->KernelStack-0x2000) {
810 Log_Warning("Proc", "Possible bad ESP %p (PID %i)", thread->SavedState.ESP);
815 __asm__ __volatile__ (
816 "mov %1, %%esp\n\t" // Restore ESP
817 "mov %2, %%ebp\n\t" // and EBP
818 "jmp *%3" : : // And return to where we saved state (Proc_Clone or Proc_Scheduler)
819 "a"(SWITCH_MAGIC), "b"(thread->SavedState.ESP),
820 "d"(thread->SavedState.EBP), "c"(thread->SavedState.EIP)
822 for(;;); // Shouldn't reach here
826 EXPORT(Proc_SpawnWorker);