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 tProcess gProcessZero;
53 extern void Threads_Dump(void);
54 extern void Proc_ReturnToUser(tVAddr Handler, tVAddr KStackTop, int Argument);
55 extern void Time_UpdateTimestamp(void);
56 extern void SwitchTasks(Uint NewSP, Uint *OldSP, Uint NewIP, Uint *OldIO, Uint CR3);
59 //void ArchThreads_Init(void);
61 void MP_StartAP(int CPU);
62 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
64 void Proc_IdleTask(void *unused);
65 //void Proc_Start(void);
66 //tThread *Proc_GetCurThread(void);
67 // int Proc_NewKThread(void (*Fcn)(void*), void *Data);
68 // int Proc_Clone(Uint *Err, Uint Flags);
69 // int Proc_SpawnWorker(void);
70 Uint Proc_MakeUserStack(void);
71 //void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize);
72 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP) NORETURN;
73 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs);
74 //void Proc_CallFaultHandler(tThread *Thread);
75 //void Proc_DumpThreadCPUState(tThread *Thread);
76 //void Proc_Reschedule(void);
77 void Proc_Scheduler(int CPU, Uint RSP, Uint RIP);
80 //!\brief Used by desctab.asm in SyscallStub
81 const int ci_offsetof_tThread_KernelStack = offsetof(tThread, KernelStack);
82 // --- Multiprocessing ---
84 volatile int giNumInitingCPUs = 0;
85 tMPInfo *gMPFloatPtr = NULL;
86 tAPIC *gpMP_LocalAPIC = NULL;
87 Uint8 gaAPIC_to_CPU[256] = {0};
89 tCPU gaCPUs[MAX_CPUS] = {
90 {.Current = &gThreadZero}
94 // --- Error Recovery ---
95 Uint32 gaDoubleFaultStack[1024];
99 * \fn void ArchThreads_Init(void)
100 * \brief Starts the process scheduler
102 void ArchThreads_Init(void)
109 // Mark BSP as active
112 // -- Initialise Multiprocessing
113 // Find MP Floating Table
114 // - EBDA/Last 1Kib (640KiB)
115 for(pos = KERNEL_BASE|0x9F000; pos < (KERNEL_BASE|0xA0000); 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;
123 // - Last KiB (512KiB base mem)
125 for(pos = KERNEL_BASE|0x7F000; pos < (KERNEL_BASE|0x80000); pos += 16) {
126 if( *(Uint*)(pos) == MPPTR_IDENT ) {
127 Log("Possible %p", pos);
128 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
129 gMPFloatPtr = (void*)pos;
136 for(pos = KERNEL_BASE|0xE0000; pos < (KERNEL_BASE|0x100000); pos += 16) {
137 if( *(Uint*)(pos) == MPPTR_IDENT ) {
138 Log("Possible %p", pos);
139 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
140 gMPFloatPtr = (void*)pos;
146 // If the MP Table Exists, parse it
151 Log("gMPFloatPtr = %p", gMPFloatPtr);
152 Log("*gMPFloatPtr = {");
153 Log("\t.Sig = 0x%08x", gMPFloatPtr->Sig);
154 Log("\t.MPConfig = 0x%08x", gMPFloatPtr->MPConfig);
155 Log("\t.Length = 0x%02x", gMPFloatPtr->Length);
156 Log("\t.Version = 0x%02x", gMPFloatPtr->Version);
157 Log("\t.Checksum = 0x%02x", gMPFloatPtr->Checksum);
158 Log("\t.Features = [0x%02x,0x%02x,0x%02x,0x%02x,0x%02x]",
159 gMPFloatPtr->Features[0], gMPFloatPtr->Features[1],
160 gMPFloatPtr->Features[2], gMPFloatPtr->Features[3],
161 gMPFloatPtr->Features[4]
165 mptable = (void*)( KERNEL_BASE|gMPFloatPtr->MPConfig );
166 Log("mptable = %p", mptable);
168 Log("\t.Sig = 0x%08x", mptable->Sig);
169 Log("\t.BaseTableLength = 0x%04x", mptable->BaseTableLength);
170 Log("\t.SpecRev = 0x%02x", mptable->SpecRev);
171 Log("\t.Checksum = 0x%02x", mptable->Checksum);
172 Log("\t.OEMID = '%8c'", mptable->OemID);
173 Log("\t.ProductID = '%8c'", mptable->ProductID);
174 Log("\t.OEMTablePtr = %p'", mptable->OEMTablePtr);
175 Log("\t.OEMTableSize = 0x%04x", mptable->OEMTableSize);
176 Log("\t.EntryCount = 0x%04x", mptable->EntryCount);
177 Log("\t.LocalAPICMemMap = 0x%08x", mptable->LocalAPICMemMap);
178 Log("\t.ExtendedTableLen = 0x%04x", mptable->ExtendedTableLen);
179 Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum);
182 gpMP_LocalAPIC = (void*)MM_MapHWPage(mptable->LocalAPICMemMap, 1);
184 ents = mptable->Entries;
187 for( i = 0; i < mptable->EntryCount; i ++ )
194 Log("%i: Processor", i);
195 Log("\t.APICID = %i", ents->Proc.APICID);
196 Log("\t.APICVer = 0x%02x", ents->Proc.APICVer);
197 Log("\t.CPUFlags = 0x%02x", ents->Proc.CPUFlags);
198 Log("\t.CPUSignature = 0x%08x", ents->Proc.CPUSignature);
199 Log("\t.FeatureFlags = 0x%08x", ents->Proc.FeatureFlags);
202 if( !(ents->Proc.CPUFlags & 1) ) {
207 // Check if there is too many processors
208 if(giNumCPUs >= MAX_CPUS) {
209 giNumCPUs ++; // If `giNumCPUs` > MAX_CPUS later, it will be clipped
213 // Initialise CPU Info
214 gaAPIC_to_CPU[ents->Proc.APICID] = giNumCPUs;
215 gaCPUs[giNumCPUs].APICID = ents->Proc.APICID;
216 gaCPUs[giNumCPUs].State = 0;
220 if( !(ents->Proc.CPUFlags & 2) )
222 MP_StartAP( giNumCPUs-1 );
229 Log("\t.ID = %i", ents->Bus.ID);
230 Log("\t.TypeString = '%6c'", ents->Bus.TypeString);
234 Log("%i: I/O APIC", i);
235 Log("\t.ID = %i", ents->IOAPIC.ID);
236 Log("\t.Version = 0x%02x", ents->IOAPIC.Version);
237 Log("\t.Flags = 0x%02x", ents->IOAPIC.Flags);
238 Log("\t.Addr = 0x%08x", ents->IOAPIC.Addr);
240 case 3: // I/O Interrupt Assignment
242 Log("%i: I/O Interrupt Assignment", i);
243 Log("\t.IntType = %i", ents->IOInt.IntType);
244 Log("\t.Flags = 0x%04x", ents->IOInt.Flags);
245 Log("\t.SourceBusID = 0x%02x", ents->IOInt.SourceBusID);
246 Log("\t.SourceBusIRQ = 0x%02x", ents->IOInt.SourceBusIRQ);
247 Log("\t.DestAPICID = 0x%02x", ents->IOInt.DestAPICID);
248 Log("\t.DestAPICIRQ = 0x%02x", ents->IOInt.DestAPICIRQ);
250 case 4: // Local Interrupt Assignment
252 Log("%i: Local Interrupt Assignment", i);
253 Log("\t.IntType = %i", ents->LocalInt.IntType);
254 Log("\t.Flags = 0x%04x", ents->LocalInt.Flags);
255 Log("\t.SourceBusID = 0x%02x", ents->LocalInt.SourceBusID);
256 Log("\t.SourceBusIRQ = 0x%02x", ents->LocalInt.SourceBusIRQ);
257 Log("\t.DestLocalAPICID = 0x%02x", ents->LocalInt.DestLocalAPICID);
258 Log("\t.DestLocalAPICIRQ = 0x%02x", ents->LocalInt.DestLocalAPICIRQ);
261 Log("%i: Unknown (%i)", i, ents->Type);
264 ents = (void*)( (Uint)ents + entSize );
267 if( giNumCPUs > MAX_CPUS ) {
268 Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS);
269 giNumCPUs = MAX_CPUS;
272 while( giNumInitingCPUs )
273 MM_FinishVirtualInit();
275 Panic("Uh oh... MP Table Parsing is unimplemented\n");
278 Log("No MP Table was found, assuming uniprocessor\n");
285 MM_FinishVirtualInit();
289 // Initialise Normal TSS(s)
290 for(pos=0;pos<giNumCPUs;pos++)
295 gTSSs[pos].RSP0 = 0; // Set properly by scheduler
296 gGDT[7+pos*2].LimitLow = sizeof(tTSS) & 0xFFFF;
297 gGDT[7+pos*2].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
298 gGDT[7+pos*2].BaseMid = ((Uint)(&gTSSs[pos])) >> 16;
299 gGDT[7+pos*2].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
300 gGDT[7+pos*2+1].DWord[0] = ((Uint)(&gTSSs[pos])) >> 32;
303 for(pos=0;pos<giNumCPUs;pos++) {
304 __asm__ __volatile__ ("ltr %%ax"::"a"(0x38+pos*16));
307 __asm__ __volatile__ ("ltr %%ax"::"a"(0x38));
310 // Set Debug registers
311 __asm__ __volatile__ ("mov %0, %%db0" : : "r"(&gThreadZero));
312 __asm__ __volatile__ ("mov %%rax, %%db1" : : "a"(0));
314 gaCPUs[0].Current = &gThreadZero;
316 gProcessZero.MemState.CR3 = (Uint)gInitialPML4 - KERNEL_BASE;
317 gThreadZero.CurCPU = 0;
318 gThreadZero.KernelStack = 0xFFFFA00000000000 + KERNEL_STACK_SIZE;
320 // Set timer frequency
321 outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator
322 outb(0x40, PIT_TIMER_DIVISOR&0xFF); // Low Byte of Divisor
323 outb(0x40, (PIT_TIMER_DIVISOR>>8)&0xFF); // High Byte
325 // Create Per-Process Data Block
326 if( !MM_Allocate(MM_PPD_CFG) )
328 Warning("Oh, hell, Unable to allocate PPD for Thread#0");
331 Proc_InitialiseSSE();
333 Log_Log("Proc", "Multithreading initialised");
337 void MP_StartAP(int CPU)
339 Log("Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID);
340 // Set location of AP startup code and mark for a warm restart
341 *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0);
342 *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
343 outb(0x70, 0x0F); outb(0x71, 0x0A); // Warm Reset
344 MP_SendIPI(gaCPUs[CPU].APICID, 0, 5);
348 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
350 Uint32 addr = (Uint)gpMP_LocalAPIC + 0x300;
354 val = (Uint)APICID << 24;
355 Log("*%p = 0x%08x", addr+0x10, val);
356 *(Uint32*)(addr+0x10) = val;
358 val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF);
359 Log("*%p = 0x%08x", addr, val);
360 *(Uint32*)addr = val;
367 void Proc_IdleTask(void *ptr)
370 cpu->IdleThread = Proc_GetCurThread();
371 cpu->IdleThread->ThreadName = (char*)"Idle Thread";
372 Threads_SetPriority( cpu->IdleThread, -1 ); // Never called randomly
373 cpu->IdleThread->Quantum = 1; // 1 slice quantum
375 HALT(); // Just yeilds
381 * \fn void Proc_Start(void)
382 * \brief Start process scheduler
384 void Proc_Start(void)
392 for( i = 0; i < giNumCPUs; i ++ )
395 if(i) gaCPUs[i].Current = NULL;
397 Proc_NewKThread(Proc_IdleTask, &gaCPUs[i]);
400 gaCPUs[i].IdleThread = Threads_GetThread(tid);
404 if( i != giProc_BootProcessorID ) {
409 // BSP still should run the current task
410 gaCPUs[0].Current = &gThreadZero;
411 __asm__ __volatile__ ("mov %0, %%db0" : : "r"(&gThreadZero));
413 // Start interrupts and wait for APs to come up
414 Log("Waiting for APs to come up\n");
415 __asm__ __volatile__ ("sti");
416 while( giNumInitingCPUs ) __asm__ __volatile__ ("hlt");
418 Proc_NewKThread(Proc_IdleTask, &gaCPUs[0]);
420 // Start Interrupts (and hence scheduler)
421 __asm__ __volatile__("sti");
423 MM_FinishVirtualInit();
424 Log_Log("Proc", "Multithreading started");
428 * \fn tThread *Proc_GetCurThread(void)
429 * \brief Gets the current thread
431 tThread *Proc_GetCurThread(void)
435 __asm__ __volatile__ ("mov %%db0, %0" : "=r"(thread));
436 return ret; // gaCPUs[ GetCPUNum() ].Current;
438 return gaCPUs[ 0 ].Current;
442 void Proc_ClearProcess(tProcess *Process)
444 Log_Warning("Proc", "TODO: Nuke address space etc");
450 void Proc_ClearThread(tThread *Thread)
455 * \brief Create a new kernel thread
457 tTID Proc_NewKThread(void (*Fcn)(void*), void *Data)
460 tThread *newThread, *cur;
462 cur = Proc_GetCurThread();
463 newThread = Threads_CloneTCB(0);
464 if(!newThread) return -1;
467 newThread->KernelStack = MM_NewKStack();
469 if(newThread->KernelStack == 0) {
474 rsp = newThread->KernelStack;
475 *(Uint*)(rsp-=8) = (Uint)Data; // Data (shadowed)
476 *(Uint*)(rsp-=8) = (Uint)Fcn; // Function to call
477 *(Uint*)(rsp-=8) = (Uint)newThread; // Thread ID
479 newThread->SavedState.RSP = rsp;
480 newThread->SavedState.RIP = (Uint)&NewTaskHeader;
481 newThread->SavedState.SSE = NULL;
482 // Log("New (KThread) %p, rsp = %p\n", newThread->SavedState.RIP, newThread->SavedState.RSP);
485 Threads_AddActive(newThread);
487 return newThread->TID;
491 * \fn int Proc_Clone(Uint Flags)
492 * \brief Clone the current process
494 tTID Proc_Clone(Uint Flags)
496 tThread *newThread, *cur = Proc_GetCurThread();
500 if( !(Flags & CLONE_VM) ) {
501 Log_Error("Proc", "Proc_Clone: Don't leave CLONE_VM unset, use Proc_NewKThread instead");
506 newThread = Threads_CloneTCB(Flags);
507 if(!newThread) return -1;
509 // Save core machine state
510 rip = Proc_CloneInt(&newThread->SavedState.RSP, &newThread->Process->MemState.CR3);
511 if(rip == 0) return 0; // Child
512 newThread->KernelStack = cur->KernelStack;
513 newThread->SavedState.RIP = rip;
514 newThread->SavedState.SSE = NULL;
518 Log("New (Clone) %p, rsp = %p, cr3 = %p", rip, newThread->SavedState.RSP, newThread->MemState.CR3);
521 __asm__ __volatile__ ("mov %%cr3, %0" : "=r" (cr3));
522 Log("Current CR3 = 0x%x, PADDR(RSP) = 0x%x", cr3, MM_GetPhysAddr(newThread->SavedState.RSP));
527 // Lock list and add to active
528 Threads_AddActive(newThread);
530 return newThread->TID;
534 * \fn int Proc_SpawnWorker(void)
535 * \brief Spawns a new worker thread
537 int Proc_SpawnWorker(void (*Fcn)(void*), void *Data)
540 Uint stack_contents[3];
542 cur = Proc_GetCurThread();
545 new = Threads_CloneThreadZero();
547 Warning("Proc_SpawnWorker - Out of heap space!\n");
551 // Create the stack contents
552 stack_contents[2] = (Uint)Data;
553 stack_contents[1] = (Uint)Fcn;
554 stack_contents[0] = (Uint)new;
556 // Create a new worker stack (in PID0's address space)
557 // - The stack is built by this code using stack_contents
558 new->KernelStack = MM_NewWorkerStack(stack_contents, sizeof(stack_contents));
560 new->SavedState.RSP = new->KernelStack - sizeof(stack_contents);
561 new->SavedState.RIP = (Uint)&NewTaskHeader;
562 new->SavedState.SSE = NULL;
564 // Log("New (Worker) %p, rsp = %p\n", new->SavedState.RIP, new->SavedState.RSP);
567 new->Status = THREAD_STAT_PREINIT;
568 Threads_AddActive( new );
574 * \brief Creates a new user stack
576 Uint Proc_MakeUserStack(void)
579 Uint base = USER_STACK_TOP - USER_STACK_SZ;
581 // Check Prospective Space
582 for( i = USER_STACK_SZ >> 12; i--; )
584 if( MM_GetPhysAddr( (void*)(base + (i<<12)) ) != 0 )
588 if(i != -1) return 0;
590 // Allocate Stack - Allocate incrementally to clean up MM_Dump output
591 // - Most of the user stack is the zero page
592 for( i = 0; i < (USER_STACK_SZ-USER_STACK_PREALLOC)/0x1000; i++ )
594 MM_AllocateZero( base + (i<<12) );
596 // - but the top USER_STACK_PREALLOC pages are actually allocated
597 for( ; i < USER_STACK_SZ/0x1000; i++ )
599 tPAddr alloc = MM_Allocate( base + (i<<12) );
603 Log_Error("Proc", "Unable to allocate user stack (%i pages requested)", USER_STACK_SZ/0x1000);
605 MM_Deallocate( base + (i<<12) );
610 return base + USER_STACK_SZ;
613 void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, const char **ArgV, int DataSize)
617 const char **envp = NULL;
622 stack = (void*)Proc_MakeUserStack();
624 Log_Error("Proc", "Unable to create user stack!");
627 stack -= (DataSize+7)/8;
628 memcpy( stack, ArgV, DataSize );
631 // Adjust Arguments and environment
634 Uint delta = (Uint)stack - (Uint)ArgV;
635 ArgV = (const char**)stack;
636 for( i = 0; ArgV[i]; i++ ) ArgV[i] += delta;
638 for( i = 0; envp[i]; i++ ) envp[i] += delta;
641 // User Mode Segments
643 ss = 0x23; cs = 0x2B;
646 *--stack = (Uint)envp;
647 *--stack = (Uint)ArgV;
648 *--stack = (Uint)ArgC;
651 Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
654 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
656 if( !(CS == 0x1B || CS == 0x2B) || SS != 0x23 ) {
657 Log_Error("Proc", "Proc_StartProcess: CS / SS are not valid (%x, %x)",
661 // Log("Proc_StartProcess: (SS=%x, Stack=%p, Flags=%x, CS=%x, IP=%p)", SS, Stack, Flags, CS, IP);
662 // MM_DumpTables(0, USER_MAX);
666 __asm__ __volatile__ (
667 "mov %0, %%rsp;\n\t" // Set stack pointer
668 "mov %2, %%r11;\n\t" // Set RFLAGS
670 : : "r" (Stack), "c" (IP), "r" (Flags)
676 __asm__ __volatile__ (
677 "mov %0, %%rsp;\n\t" // Set stack pointer
678 "mov %2, %%r11;\n\t" // Set RFLAGS
680 : : "r" (Stack), "c" (IP), "r" (Flags)
687 * \fn int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
688 * \brief Demotes a process to a lower permission level
689 * \param Err Pointer to user's errno
690 * \param Dest New Permission Level
691 * \param Regs Pointer to user's register structure
693 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
695 int cpl = Regs->CS & 3;
697 if(Dest > 3 || Dest < 0) {
708 // Change the Segment Registers
709 Regs->CS = (((Dest+1)<<4) | Dest) - 8;
710 Regs->SS = ((Dest+1)<<4) | Dest;
716 * \brief Calls a signal handler in user mode
717 * \note Used for signals
719 void Proc_CallFaultHandler(tThread *Thread)
722 Proc_ReturnToUser(Thread->FaultHandler, Thread->KernelStack, Thread->CurFaultNum);
726 void Proc_DumpThreadCPUState(tThread *Thread)
728 Log(" At %04x:%016llx", Thread->SavedState.UserCS, Thread->SavedState.UserRIP);
731 void Proc_Reschedule(void)
733 tThread *nextthread, *curthread;
734 int cpu = GetCPUNum();
736 // TODO: Wait for it?
737 if(IS_LOCKED(&glThreadListLock)) return;
739 curthread = gaCPUs[cpu].Current;
741 nextthread = Threads_GetNextToRun(cpu, curthread);
743 if(nextthread == curthread) return ;
745 nextthread = gaCPUs[cpu].IdleThread;
749 #if DEBUG_TRACE_SWITCH
750 LogF("\nSwitching to task CR3 = 0x%x, RIP = %p, RSP = %p - %i (%s)\n",
751 nextthread->Process->MemState.CR3,
752 nextthread->SavedState.RIP,
753 nextthread->SavedState.RSP,
755 nextthread->ThreadName
760 gaCPUs[cpu].Current = nextthread;
761 gTSSs[cpu].RSP0 = nextthread->KernelStack-4;
762 __asm__ __volatile__ ("mov %0, %%db0" : : "r" (nextthread));
766 // Save FPU/MMX/XMM/SSE state
767 if( curthread->SavedState.SSE )
769 Proc_SaveSSE( ((Uint)curthread->SavedState.SSE + 0xF) & ~0xF );
770 curthread->SavedState.bSSEModified = 0;
774 nextthread->SavedState.RSP, &curthread->SavedState.RSP,
775 nextthread->SavedState.RIP, &curthread->SavedState.RIP,
776 nextthread->Process->MemState.CR3
783 nextthread->SavedState.RSP, &tmp,
784 nextthread->SavedState.RIP, &tmp,
785 nextthread->Process->MemState.CR3
792 * \fn void Proc_Scheduler(int CPU)
793 * \brief Swap current thread and clears dead threads
795 void Proc_Scheduler(int CPU, Uint RSP, Uint RIP)
800 // If the spinlock is set, let it complete
801 if(IS_LOCKED(&glThreadListLock)) return;
803 // Get current thread
804 thread = gaCPUs[CPU].Current;
809 // Reduce remaining quantum and continue timeslice if non-zero
810 if(thread->Remaining--) return;
811 // Reset quantum for next call
812 thread->Remaining = thread->Quantum;
814 // TODO: Make this more stable somehow
816 regs = (tRegs*)(RSP+(1)*8); // CurThread
817 thread->SavedState.UserCS = regs->CS;
818 thread->SavedState.UserRIP = regs->RIP;
829 EXPORT(Proc_SpawnWorker);