8 #include <threads_int.h>
15 #include <arch_config.h>
19 #define DEBUG_TRACE_SWITCH 0
20 #define BREAK_ON_SWITCH 0 // Break into bochs debugger on a task switch
28 Uint8 State; // 0: Unavaliable, 1: Idle, 2: Active
36 extern void APStartup(void); // 16-bit AP startup code
38 extern Uint GetRIP(void); // start.asm
39 extern Uint SaveState(Uint *RSP, Uint *Regs);
40 extern Uint Proc_CloneInt(Uint *RSP, Uint *CR3);
41 extern void NewTaskHeader(void); // Actually takes cdecl args
42 extern void Proc_InitialiseSSE(void);
43 extern void Proc_SaveSSE(Uint DestPtr);
44 extern void Proc_DisableSSE(void);
46 extern Uint64 gInitialPML4[512]; // start.asm
49 extern int giTotalTickets;
50 extern int giNumActiveThreads;
51 extern tThread gThreadZero;
52 extern void Threads_Dump(void);
53 extern void Proc_ReturnToUser(tVAddr Handler, tVAddr KStackTop, int Argument);
54 extern void Time_UpdateTimestamp(void);
55 extern void SwitchTasks(Uint NewSP, Uint *OldSP, Uint NewIP, Uint *OldIO, Uint CR3);
58 //void ArchThreads_Init(void);
60 void MP_StartAP(int CPU);
61 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
63 void Proc_IdleTask(void *unused);
64 //void Proc_Start(void);
65 //tThread *Proc_GetCurThread(void);
66 // int Proc_NewKThread(void (*Fcn)(void*), void *Data);
67 // int Proc_Clone(Uint *Err, Uint Flags);
68 // int Proc_SpawnWorker(void);
69 Uint Proc_MakeUserStack(void);
70 //void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize);
71 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP) NORETURN;
72 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs);
73 //void Proc_CallFaultHandler(tThread *Thread);
74 //void Proc_DumpThreadCPUState(tThread *Thread);
75 //void Proc_Reschedule(void);
76 void Proc_Scheduler(int CPU, Uint RSP, Uint RIP);
79 //!\brief Used by desctab.asm in SyscallStub
80 const int ci_offsetof_tThread_KernelStack = offsetof(tThread, KernelStack);
81 // --- Multiprocessing ---
83 volatile int giNumInitingCPUs = 0;
84 tMPInfo *gMPFloatPtr = NULL;
85 tAPIC *gpMP_LocalAPIC = NULL;
86 Uint8 gaAPIC_to_CPU[256] = {0};
88 tCPU gaCPUs[MAX_CPUS];
91 // --- Error Recovery ---
92 Uint32 gaDoubleFaultStack[1024];
96 * \fn void ArchThreads_Init(void)
97 * \brief Starts the process scheduler
99 void ArchThreads_Init(void)
106 // Mark BSP as active
109 // -- Initialise Multiprocessing
110 // Find MP Floating Table
111 // - EBDA/Last 1Kib (640KiB)
112 for(pos = KERNEL_BASE|0x9F000; pos < (KERNEL_BASE|0xA0000); pos += 16) {
113 if( *(Uint*)(pos) == MPPTR_IDENT ) {
114 Log("Possible %p", pos);
115 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
116 gMPFloatPtr = (void*)pos;
120 // - Last KiB (512KiB base mem)
122 for(pos = KERNEL_BASE|0x7F000; pos < (KERNEL_BASE|0x80000); pos += 16) {
123 if( *(Uint*)(pos) == MPPTR_IDENT ) {
124 Log("Possible %p", pos);
125 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
126 gMPFloatPtr = (void*)pos;
133 for(pos = KERNEL_BASE|0xE0000; pos < (KERNEL_BASE|0x100000); pos += 16) {
134 if( *(Uint*)(pos) == MPPTR_IDENT ) {
135 Log("Possible %p", pos);
136 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
137 gMPFloatPtr = (void*)pos;
143 // If the MP Table Exists, parse it
148 Log("gMPFloatPtr = %p", gMPFloatPtr);
149 Log("*gMPFloatPtr = {");
150 Log("\t.Sig = 0x%08x", gMPFloatPtr->Sig);
151 Log("\t.MPConfig = 0x%08x", gMPFloatPtr->MPConfig);
152 Log("\t.Length = 0x%02x", gMPFloatPtr->Length);
153 Log("\t.Version = 0x%02x", gMPFloatPtr->Version);
154 Log("\t.Checksum = 0x%02x", gMPFloatPtr->Checksum);
155 Log("\t.Features = [0x%02x,0x%02x,0x%02x,0x%02x,0x%02x]",
156 gMPFloatPtr->Features[0], gMPFloatPtr->Features[1],
157 gMPFloatPtr->Features[2], gMPFloatPtr->Features[3],
158 gMPFloatPtr->Features[4]
162 mptable = (void*)( KERNEL_BASE|gMPFloatPtr->MPConfig );
163 Log("mptable = %p", mptable);
165 Log("\t.Sig = 0x%08x", mptable->Sig);
166 Log("\t.BaseTableLength = 0x%04x", mptable->BaseTableLength);
167 Log("\t.SpecRev = 0x%02x", mptable->SpecRev);
168 Log("\t.Checksum = 0x%02x", mptable->Checksum);
169 Log("\t.OEMID = '%8c'", mptable->OemID);
170 Log("\t.ProductID = '%8c'", mptable->ProductID);
171 Log("\t.OEMTablePtr = %p'", mptable->OEMTablePtr);
172 Log("\t.OEMTableSize = 0x%04x", mptable->OEMTableSize);
173 Log("\t.EntryCount = 0x%04x", mptable->EntryCount);
174 Log("\t.LocalAPICMemMap = 0x%08x", mptable->LocalAPICMemMap);
175 Log("\t.ExtendedTableLen = 0x%04x", mptable->ExtendedTableLen);
176 Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum);
179 gpMP_LocalAPIC = (void*)MM_MapHWPage(mptable->LocalAPICMemMap, 1);
181 ents = mptable->Entries;
184 for( i = 0; i < mptable->EntryCount; i ++ )
191 Log("%i: Processor", i);
192 Log("\t.APICID = %i", ents->Proc.APICID);
193 Log("\t.APICVer = 0x%02x", ents->Proc.APICVer);
194 Log("\t.CPUFlags = 0x%02x", ents->Proc.CPUFlags);
195 Log("\t.CPUSignature = 0x%08x", ents->Proc.CPUSignature);
196 Log("\t.FeatureFlags = 0x%08x", ents->Proc.FeatureFlags);
199 if( !(ents->Proc.CPUFlags & 1) ) {
204 // Check if there is too many processors
205 if(giNumCPUs >= MAX_CPUS) {
206 giNumCPUs ++; // If `giNumCPUs` > MAX_CPUS later, it will be clipped
210 // Initialise CPU Info
211 gaAPIC_to_CPU[ents->Proc.APICID] = giNumCPUs;
212 gaCPUs[giNumCPUs].APICID = ents->Proc.APICID;
213 gaCPUs[giNumCPUs].State = 0;
217 if( !(ents->Proc.CPUFlags & 2) )
219 MP_StartAP( giNumCPUs-1 );
226 Log("\t.ID = %i", ents->Bus.ID);
227 Log("\t.TypeString = '%6c'", ents->Bus.TypeString);
231 Log("%i: I/O APIC", i);
232 Log("\t.ID = %i", ents->IOAPIC.ID);
233 Log("\t.Version = 0x%02x", ents->IOAPIC.Version);
234 Log("\t.Flags = 0x%02x", ents->IOAPIC.Flags);
235 Log("\t.Addr = 0x%08x", ents->IOAPIC.Addr);
237 case 3: // I/O Interrupt Assignment
239 Log("%i: I/O Interrupt Assignment", i);
240 Log("\t.IntType = %i", ents->IOInt.IntType);
241 Log("\t.Flags = 0x%04x", ents->IOInt.Flags);
242 Log("\t.SourceBusID = 0x%02x", ents->IOInt.SourceBusID);
243 Log("\t.SourceBusIRQ = 0x%02x", ents->IOInt.SourceBusIRQ);
244 Log("\t.DestAPICID = 0x%02x", ents->IOInt.DestAPICID);
245 Log("\t.DestAPICIRQ = 0x%02x", ents->IOInt.DestAPICIRQ);
247 case 4: // Local Interrupt Assignment
249 Log("%i: Local Interrupt Assignment", i);
250 Log("\t.IntType = %i", ents->LocalInt.IntType);
251 Log("\t.Flags = 0x%04x", ents->LocalInt.Flags);
252 Log("\t.SourceBusID = 0x%02x", ents->LocalInt.SourceBusID);
253 Log("\t.SourceBusIRQ = 0x%02x", ents->LocalInt.SourceBusIRQ);
254 Log("\t.DestLocalAPICID = 0x%02x", ents->LocalInt.DestLocalAPICID);
255 Log("\t.DestLocalAPICIRQ = 0x%02x", ents->LocalInt.DestLocalAPICIRQ);
258 Log("%i: Unknown (%i)", i, ents->Type);
261 ents = (void*)( (Uint)ents + entSize );
264 if( giNumCPUs > MAX_CPUS ) {
265 Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS);
266 giNumCPUs = MAX_CPUS;
269 while( giNumInitingCPUs )
270 MM_FinishVirtualInit();
272 Panic("Uh oh... MP Table Parsing is unimplemented\n");
275 Log("No MP Table was found, assuming uniprocessor\n");
282 MM_FinishVirtualInit();
286 // Initialise Normal TSS(s)
287 for(pos=0;pos<giNumCPUs;pos++)
292 gTSSs[pos].RSP0 = 0; // Set properly by scheduler
293 gGDT[7+pos*2].LimitLow = sizeof(tTSS) & 0xFFFF;
294 gGDT[7+pos*2].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
295 gGDT[7+pos*2].BaseMid = ((Uint)(&gTSSs[pos])) >> 16;
296 gGDT[7+pos*2].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
297 gGDT[7+pos*2+1].DWord[0] = ((Uint)(&gTSSs[pos])) >> 32;
300 for(pos=0;pos<giNumCPUs;pos++) {
301 __asm__ __volatile__ ("ltr %%ax"::"a"(0x38+pos*16));
304 __asm__ __volatile__ ("ltr %%ax"::"a"(0x38));
307 // Set Debug registers
308 __asm__ __volatile__ ("mov %0, %%db0" : : "r"(&gThreadZero));
309 __asm__ __volatile__ ("mov %%rax, %%db1" : : "a"(0));
311 gaCPUs[0].Current = &gThreadZero;
313 gThreadZero.MemState.CR3 = (Uint)gInitialPML4 - KERNEL_BASE;
314 gThreadZero.CurCPU = 0;
315 gThreadZero.KernelStack = 0xFFFFA00000000000 + KERNEL_STACK_SIZE;
317 // Set timer frequency
318 outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator
319 outb(0x40, PIT_TIMER_DIVISOR&0xFF); // Low Byte of Divisor
320 outb(0x40, (PIT_TIMER_DIVISOR>>8)&0xFF); // High Byte
322 // Create Per-Process Data Block
323 if( !MM_Allocate(MM_PPD_CFG) )
325 Warning("Oh, hell, Unable to allocate PPD for Thread#0");
328 Proc_InitialiseSSE();
330 Log_Log("Proc", "Multithreading initialised");
334 void MP_StartAP(int CPU)
336 Log("Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID);
337 // Set location of AP startup code and mark for a warm restart
338 *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0);
339 *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
340 outb(0x70, 0x0F); outb(0x71, 0x0A); // Warm Reset
341 MP_SendIPI(gaCPUs[CPU].APICID, 0, 5);
345 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
347 Uint32 addr = (Uint)gpMP_LocalAPIC + 0x300;
351 val = (Uint)APICID << 24;
352 Log("*%p = 0x%08x", addr+0x10, val);
353 *(Uint32*)(addr+0x10) = val;
355 val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF);
356 Log("*%p = 0x%08x", addr, val);
357 *(Uint32*)addr = val;
364 void Proc_IdleTask(void *ptr)
367 cpu->IdleThread = Proc_GetCurThread();
368 cpu->IdleThread->ThreadName = (char*)"Idle Thread";
369 Threads_SetPriority( cpu->IdleThread, -1 ); // Never called randomly
370 cpu->IdleThread->Quantum = 1; // 1 slice quantum
372 HALT(); // Just yeilds
378 * \fn void Proc_Start(void)
379 * \brief Start process scheduler
381 void Proc_Start(void)
389 for( i = 0; i < giNumCPUs; i ++ )
392 if(i) gaCPUs[i].Current = NULL;
394 Proc_NewKThread(Proc_IdleTask, &gaCPUs[i]);
397 gaCPUs[i].IdleThread = Threads_GetThread(tid);
401 if( i != giProc_BootProcessorID ) {
406 // BSP still should run the current task
407 gaCPUs[0].Current = &gThreadZero;
409 // Start interrupts and wait for APs to come up
410 Log("Waiting for APs to come up\n");
411 __asm__ __volatile__ ("sti");
412 while( giNumInitingCPUs ) __asm__ __volatile__ ("hlt");
414 Proc_NewKThread(Proc_IdleTask, &gaCPUs[0]);
416 // Start Interrupts (and hence scheduler)
417 __asm__ __volatile__("sti");
419 MM_FinishVirtualInit();
420 Log_Log("Proc", "Multithreading started");
424 * \fn tThread *Proc_GetCurThread(void)
425 * \brief Gets the current thread
427 tThread *Proc_GetCurThread(void)
430 return gaCPUs[ GetCPUNum() ].Current;
432 return gaCPUs[ 0 ].Current;
439 void Proc_ClearThread(tThread *Thread)
441 Log_Warning("Proc", "TODO: Nuke address space etc");
445 * \brief Create a new kernel thread
447 int Proc_NewKThread(void (*Fcn)(void*), void *Data)
450 tThread *newThread, *cur;
452 cur = Proc_GetCurThread();
453 newThread = Threads_CloneTCB(0);
454 if(!newThread) return -1;
457 newThread->MemState.CR3 = cur->MemState.CR3;
460 newThread->KernelStack = MM_NewKStack();
462 if(newThread->KernelStack == 0) {
467 rsp = newThread->KernelStack;
468 *(Uint*)(rsp-=8) = (Uint)Data; // Data (shadowed)
469 *(Uint*)(rsp-=8) = 1; // Number of params
470 *(Uint*)(rsp-=8) = (Uint)Fcn; // Function to call
471 *(Uint*)(rsp-=8) = (Uint)newThread; // Thread ID
473 newThread->SavedState.RSP = rsp;
474 newThread->SavedState.RIP = (Uint)&NewTaskHeader;
475 newThread->SavedState.SSE = NULL;
476 // Log("New (KThread) %p, rsp = %p\n", newThread->SavedState.RIP, newThread->SavedState.RSP);
479 Threads_AddActive(newThread);
481 return newThread->TID;
485 * \fn int Proc_Clone(Uint Flags)
486 * \brief Clone the current process
488 int Proc_Clone(Uint Flags)
490 tThread *newThread, *cur = Proc_GetCurThread();
494 if( !(Flags & CLONE_VM) ) {
495 Log_Error("Proc", "Proc_Clone: Don't leave CLONE_VM unset, use Proc_NewKThread instead");
500 newThread = Threads_CloneTCB(Flags);
501 if(!newThread) return -1;
503 // Save core machine state
504 rip = Proc_CloneInt(&newThread->SavedState.RSP, &newThread->MemState.CR3);
505 if(rip == 0) return 0; // Child
506 newThread->KernelStack = cur->KernelStack;
507 newThread->SavedState.RIP = rip;
508 newThread->SavedState.SSE = NULL;
512 Log("New (Clone) %p, rsp = %p, cr3 = %p", rip, newThread->SavedState.RSP, newThread->MemState.CR3);
515 __asm__ __volatile__ ("mov %%cr3, %0" : "=r" (cr3));
516 Log("Current CR3 = 0x%x, PADDR(RSP) = 0x%x", cr3, MM_GetPhysAddr(newThread->SavedState.RSP));
521 // Lock list and add to active
522 Threads_AddActive(newThread);
524 return newThread->TID;
528 * \fn int Proc_SpawnWorker(void)
529 * \brief Spawns a new worker thread
531 int Proc_SpawnWorker(void (*Fcn)(void*), void *Data)
534 Uint stack_contents[4];
536 cur = Proc_GetCurThread();
539 new = malloc( sizeof(tThread) );
541 Warning("Proc_SpawnWorker - Out of heap space!\n");
544 memcpy(new, &gThreadZero, sizeof(tThread));
546 new->TID = giNextTID++;
548 // Create the stack contents
549 stack_contents[3] = (Uint)Data;
550 stack_contents[2] = 1;
551 stack_contents[1] = (Uint)Fcn;
552 stack_contents[0] = (Uint)new;
554 // Create a new worker stack (in PID0's address space)
555 // The stack is relocated by this code
556 new->KernelStack = MM_NewWorkerStack(stack_contents, sizeof(stack_contents));
558 new->SavedState.RSP = new->KernelStack - sizeof(stack_contents);
559 new->SavedState.RIP = (Uint)&NewTaskHeader;
560 new->SavedState.SSE = NULL;
562 // Log("New (Worker) %p, rsp = %p\n", new->SavedState.RIP, new->SavedState.RSP);
565 new->Status = THREAD_STAT_PREINIT;
566 Threads_AddActive( new );
572 * \brief Creates a new user stack
574 Uint Proc_MakeUserStack(void)
577 Uint base = USER_STACK_TOP - USER_STACK_SZ;
579 // Check Prospective Space
580 for( i = USER_STACK_SZ >> 12; i--; )
582 if( MM_GetPhysAddr( base + (i<<12) ) != 0 )
586 if(i != -1) return 0;
588 // Allocate Stack - Allocate incrementally to clean up MM_Dump output
589 for( i = 0; i < (USER_STACK_SZ-USER_STACK_PREALLOC)/0x1000; i++ )
591 MM_AllocateZero( base + (i<<12) );
593 for( ; i < USER_STACK_SZ/0x1000; i++ )
595 tPAddr alloc = MM_Allocate( base + (i<<12) );
599 Log_Error("Proc", "Unable to allocate user stack (%i pages requested)", USER_STACK_SZ/0x1000);
601 MM_Deallocate( base + (i<<12) );
606 return base + USER_STACK_SZ;
609 void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, char **ArgV, int DataSize)
618 stack = (void*)Proc_MakeUserStack();
620 Log_Error("Proc", "Unable to create user stack!");
623 stack -= (DataSize+7)/8;
624 memcpy( stack, ArgV, DataSize );
627 // Adjust Arguments and environment
630 Uint delta = (Uint)stack - (Uint)ArgV;
631 ArgV = (char**)stack;
632 for( i = 0; ArgV[i]; i++ ) ArgV[i] += delta;
634 for( i = 0; envp[i]; i++ ) envp[i] += delta;
637 // User Mode Segments
639 ss = 0x23; cs = 0x2B;
642 *--stack = (Uint)envp;
643 *--stack = (Uint)ArgV;
644 *--stack = (Uint)ArgC;
647 Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
650 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
652 if( !(CS == 0x1B || CS == 0x2B) || SS != 0x23 ) {
653 Log_Error("Proc", "Proc_StartProcess: CS / SS are not valid (%x, %x)",
657 // Log("Proc_StartProcess: (SS=%x, Stack=%p, Flags=%x, CS=%x, IP=%p)", SS, Stack, Flags, CS, IP);
658 // MM_DumpTables(0, USER_MAX);
662 __asm__ __volatile__ (
663 "mov %0, %%rsp;\n\t" // Set stack pointer
664 "mov %2, %%r11;\n\t" // Set RFLAGS
666 : : "r" (Stack), "c" (IP), "r" (Flags)
672 __asm__ __volatile__ (
673 "mov %0, %%rsp;\n\t" // Set stack pointer
674 "mov %2, %%r11;\n\t" // Set RFLAGS
676 : : "r" (Stack), "c" (IP), "r" (Flags)
683 * \fn int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
684 * \brief Demotes a process to a lower permission level
685 * \param Err Pointer to user's errno
686 * \param Dest New Permission Level
687 * \param Regs Pointer to user's register structure
689 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
691 int cpl = Regs->CS & 3;
693 if(Dest > 3 || Dest < 0) {
704 // Change the Segment Registers
705 Regs->CS = (((Dest+1)<<4) | Dest) - 8;
706 Regs->SS = ((Dest+1)<<4) | Dest;
712 * \brief Calls a signal handler in user mode
713 * \note Used for signals
715 void Proc_CallFaultHandler(tThread *Thread)
718 Proc_ReturnToUser(Thread->FaultHandler, Thread->KernelStack, Thread->CurFaultNum);
722 void Proc_DumpThreadCPUState(tThread *Thread)
724 Log(" At %04x:%016llx", Thread->SavedState.UserCS, Thread->SavedState.UserRIP);
727 void Proc_Reschedule(void)
729 tThread *nextthread, *curthread;
730 int cpu = GetCPUNum();
732 // TODO: Wait for it?
733 if(IS_LOCKED(&glThreadListLock)) return;
735 curthread = gaCPUs[cpu].Current;
737 nextthread = Threads_GetNextToRun(cpu, curthread);
739 if(nextthread == curthread) return ;
741 nextthread = gaCPUs[cpu].IdleThread;
745 #if DEBUG_TRACE_SWITCH
746 LogF("\nSwitching to task CR3 = 0x%x, RIP = %p, RSP = %p - %i (%s)\n",
747 nextthread->MemState.CR3,
748 nextthread->SavedState.RIP,
749 nextthread->SavedState.RSP,
751 nextthread->ThreadName
756 gaCPUs[cpu].Current = nextthread;
757 gTSSs[cpu].RSP0 = nextthread->KernelStack-4;
758 __asm__ __volatile__ ("mov %0, %%db0" : : "r" (nextthread));
760 // Save FPU/MMX/XMM/SSE state
761 if( curthread->SavedState.SSE )
763 Proc_SaveSSE( ((Uint)curthread->SavedState.SSE + 0xF) & ~0xF );
764 curthread->SavedState.bSSEModified = 0;
769 nextthread->SavedState.RSP, &curthread->SavedState.RSP,
770 nextthread->SavedState.RIP, &curthread->SavedState.RIP,
771 nextthread->MemState.CR3
777 * \fn void Proc_Scheduler(int CPU)
778 * \brief Swap current thread and clears dead threads
780 void Proc_Scheduler(int CPU, Uint RSP, Uint RIP)
786 // If the spinlock is set, let it complete
787 if(IS_LOCKED(&glThreadListLock)) return;
789 // Get current thread
790 thread = gaCPUs[CPU].Current;
795 // Reduce remaining quantum and continue timeslice if non-zero
796 if(thread->Remaining--) return;
797 // Reset quantum for next call
798 thread->Remaining = thread->Quantum;
800 // TODO: Make this more stable somehow
802 regs = (tRegs*)(RSP+(1)*8); // CurThread
803 thread->SavedState.UserCS = regs->CS;
804 thread->SavedState.UserRIP = regs->RIP;
816 EXPORT(Proc_SpawnWorker);