8 #include <threads_int.h>
17 #define DEBUG_TRACE_SWITCH 0
20 #define SWITCH_MAGIC 0x55ECAFFF##FFFACE55 // There is no code in this area
22 #define TIMER_DIVISOR 11931 //~100Hz
28 Uint8 State; // 0: Unavaliable, 1: Idle, 2: Active
36 extern void APStartup(void); // 16-bit AP startup code
37 extern Uint GetRIP(void); // start.asm
38 extern Uint64 gInitialPML4[512]; // start.asm
39 extern char gInitialKernelStack[];
40 extern tShortSpinlock glThreadListLock;
43 extern int giTotalTickets;
44 extern int giNumActiveThreads;
45 extern tThread gThreadZero;
46 extern void Threads_Dump(void);
47 extern void Proc_ReturnToUser(void);
48 extern int GetCPUNum(void);
51 void ArchThreads_Init(void);
53 void MP_StartAP(int CPU);
54 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
56 //void Proc_Start(void);
57 //tThread *Proc_GetCurThread(void);
58 void Proc_ChangeStack(void);
59 // int Proc_Clone(Uint *Err, Uint Flags);
60 // int Proc_SpawnWorker(void);
61 Uint Proc_MakeUserStack(void);
62 void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize);
63 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP);
64 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs);
65 void Proc_CallFaultHandler(tThread *Thread);
66 void Proc_DumpThreadCPUState(tThread *Thread);
67 void Proc_Scheduler(int CPU);
70 // --- Multiprocessing ---
72 volatile int giNumInitingCPUs = 0;
73 tMPInfo *gMPFloatPtr = NULL;
74 tAPIC *gpMP_LocalAPIC = NULL;
75 Uint8 gaAPIC_to_CPU[256] = {0};
77 tCPU gaCPUs[MAX_CPUS];
80 // --- Error Recovery ---
81 Uint32 gaDoubleFaultStack[1024];
85 * \fn void ArchThreads_Init(void)
86 * \brief Starts the process scheduler
88 void ArchThreads_Init(void)
98 // -- Initialise Multiprocessing
99 // Find MP Floating Table
100 // - EBDA/Last 1Kib (640KiB)
101 for(pos = KERNEL_BASE|0x9F000; pos < (KERNEL_BASE|0xA0000); pos += 16) {
102 if( *(Uint*)(pos) == MPPTR_IDENT ) {
103 Log("Possible %p", pos);
104 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
105 gMPFloatPtr = (void*)pos;
109 // - Last KiB (512KiB base mem)
111 for(pos = KERNEL_BASE|0x7F000; pos < (KERNEL_BASE|0x80000); pos += 16) {
112 if( *(Uint*)(pos) == MPPTR_IDENT ) {
113 Log("Possible %p", pos);
114 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
115 gMPFloatPtr = (void*)pos;
122 for(pos = KERNEL_BASE|0xE0000; pos < (KERNEL_BASE|0x100000); 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;
132 // If the MP Table Exists, parse it
137 Log("gMPFloatPtr = %p", gMPFloatPtr);
138 Log("*gMPFloatPtr = {");
139 Log("\t.Sig = 0x%08x", gMPFloatPtr->Sig);
140 Log("\t.MPConfig = 0x%08x", gMPFloatPtr->MPConfig);
141 Log("\t.Length = 0x%02x", gMPFloatPtr->Length);
142 Log("\t.Version = 0x%02x", gMPFloatPtr->Version);
143 Log("\t.Checksum = 0x%02x", gMPFloatPtr->Checksum);
144 Log("\t.Features = [0x%02x,0x%02x,0x%02x,0x%02x,0x%02x]",
145 gMPFloatPtr->Features[0], gMPFloatPtr->Features[1],
146 gMPFloatPtr->Features[2], gMPFloatPtr->Features[3],
147 gMPFloatPtr->Features[4]
151 mptable = (void*)( KERNEL_BASE|gMPFloatPtr->MPConfig );
152 Log("mptable = %p", mptable);
154 Log("\t.Sig = 0x%08x", mptable->Sig);
155 Log("\t.BaseTableLength = 0x%04x", mptable->BaseTableLength);
156 Log("\t.SpecRev = 0x%02x", mptable->SpecRev);
157 Log("\t.Checksum = 0x%02x", mptable->Checksum);
158 Log("\t.OEMID = '%8c'", mptable->OemID);
159 Log("\t.ProductID = '%8c'", mptable->ProductID);
160 Log("\t.OEMTablePtr = %p'", mptable->OEMTablePtr);
161 Log("\t.OEMTableSize = 0x%04x", mptable->OEMTableSize);
162 Log("\t.EntryCount = 0x%04x", mptable->EntryCount);
163 Log("\t.LocalAPICMemMap = 0x%08x", mptable->LocalAPICMemMap);
164 Log("\t.ExtendedTableLen = 0x%04x", mptable->ExtendedTableLen);
165 Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum);
168 gpMP_LocalAPIC = (void*)MM_MapHWPage(mptable->LocalAPICMemMap, 1);
170 ents = mptable->Entries;
173 for( i = 0; i < mptable->EntryCount; i ++ )
180 Log("%i: Processor", i);
181 Log("\t.APICID = %i", ents->Proc.APICID);
182 Log("\t.APICVer = 0x%02x", ents->Proc.APICVer);
183 Log("\t.CPUFlags = 0x%02x", ents->Proc.CPUFlags);
184 Log("\t.CPUSignature = 0x%08x", ents->Proc.CPUSignature);
185 Log("\t.FeatureFlags = 0x%08x", ents->Proc.FeatureFlags);
188 if( !(ents->Proc.CPUFlags & 1) ) {
193 // Check if there is too many processors
194 if(giNumCPUs >= MAX_CPUS) {
195 giNumCPUs ++; // If `giNumCPUs` > MAX_CPUS later, it will be clipped
199 // Initialise CPU Info
200 gaAPIC_to_CPU[ents->Proc.APICID] = giNumCPUs;
201 gaCPUs[giNumCPUs].APICID = ents->Proc.APICID;
202 gaCPUs[giNumCPUs].State = 0;
206 if( !(ents->Proc.CPUFlags & 2) )
208 MP_StartAP( giNumCPUs-1 );
215 Log("\t.ID = %i", ents->Bus.ID);
216 Log("\t.TypeString = '%6c'", ents->Bus.TypeString);
220 Log("%i: I/O APIC", i);
221 Log("\t.ID = %i", ents->IOAPIC.ID);
222 Log("\t.Version = 0x%02x", ents->IOAPIC.Version);
223 Log("\t.Flags = 0x%02x", ents->IOAPIC.Flags);
224 Log("\t.Addr = 0x%08x", ents->IOAPIC.Addr);
226 case 3: // I/O Interrupt Assignment
228 Log("%i: I/O Interrupt Assignment", i);
229 Log("\t.IntType = %i", ents->IOInt.IntType);
230 Log("\t.Flags = 0x%04x", ents->IOInt.Flags);
231 Log("\t.SourceBusID = 0x%02x", ents->IOInt.SourceBusID);
232 Log("\t.SourceBusIRQ = 0x%02x", ents->IOInt.SourceBusIRQ);
233 Log("\t.DestAPICID = 0x%02x", ents->IOInt.DestAPICID);
234 Log("\t.DestAPICIRQ = 0x%02x", ents->IOInt.DestAPICIRQ);
236 case 4: // Local Interrupt Assignment
238 Log("%i: Local Interrupt Assignment", i);
239 Log("\t.IntType = %i", ents->LocalInt.IntType);
240 Log("\t.Flags = 0x%04x", ents->LocalInt.Flags);
241 Log("\t.SourceBusID = 0x%02x", ents->LocalInt.SourceBusID);
242 Log("\t.SourceBusIRQ = 0x%02x", ents->LocalInt.SourceBusIRQ);
243 Log("\t.DestLocalAPICID = 0x%02x", ents->LocalInt.DestLocalAPICID);
244 Log("\t.DestLocalAPICIRQ = 0x%02x", ents->LocalInt.DestLocalAPICIRQ);
247 Log("%i: Unknown (%i)", i, ents->Type);
250 ents = (void*)( (Uint)ents + entSize );
253 if( giNumCPUs > MAX_CPUS ) {
254 Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS);
255 giNumCPUs = MAX_CPUS;
258 while( giNumInitingCPUs )
259 MM_FinishVirtualInit();
261 Panic("Uh oh... MP Table Parsing is unimplemented\n");
264 Log("No MP Table was found, assuming uniprocessor\n");
271 MM_FinishVirtualInit();
275 // Initialise Normal TSS(s)
276 for(pos=0;pos<giNumCPUs;pos++)
281 gTSSs[pos].RSP0 = 0; // Set properly by scheduler
282 gGDT[7+pos*2].LimitLow = sizeof(tTSS) & 0xFFFF;
283 gGDT[7+pos*2].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
284 gGDT[7+pos*2].BaseMid = ((Uint)(&gTSSs[pos])) >> 16;
285 gGDT[7+pos*2].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
286 gGDT[7+pos*2+1].DWord[0] = ((Uint)(&gTSSs[pos])) >> 32;
289 for(pos=0;pos<giNumCPUs;pos++) {
291 __asm__ __volatile__ ("ltr %%ax"::"a"(0x38+pos*16));
296 // Set Debug registers
297 __asm__ __volatile__ ("mov %0, %%db0" : : "r"(&gThreadZero));
298 __asm__ __volatile__ ("mov %%rax, %%db1" : : "a"(0));
300 gaCPUs[0].Current = &gThreadZero;
302 gThreadZero.MemState.CR3 = (Uint)gInitialPML4 - KERNEL_BASE;
303 gThreadZero.CurCPU = 0;
305 // Set timer frequency
306 outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator
307 outb(0x40, TIMER_DIVISOR&0xFF); // Low Byte of Divisor
308 outb(0x40, (TIMER_DIVISOR>>8)&0xFF); // High Byte
310 // Create Per-Process Data Block
311 if( !MM_Allocate(MM_PPD_CFG) )
313 Warning("Oh, hell, Unable to allocate PPD for Thread#0");
319 Log("Multithreading initialised");
323 void MP_StartAP(int CPU)
325 Log("Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID);
326 // Set location of AP startup code and mark for a warm restart
327 *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0);
328 *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
329 outb(0x70, 0x0F); outb(0x71, 0x0A); // Warm Reset
330 MP_SendIPI(gaCPUs[CPU].APICID, 0, 5);
334 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
336 Uint32 addr = (Uint)gpMP_LocalAPIC + 0x300;
340 val = (Uint)APICID << 24;
341 Log("*%p = 0x%08x", addr+0x10, val);
342 *(Uint32*)(addr+0x10) = val;
344 val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF);
345 Log("*%p = 0x%08x", addr, val);
346 *(Uint32*)addr = val;
351 * \fn void Proc_Start(void)
352 * \brief Start process scheduler
354 void Proc_Start(void)
362 for( i = 0; i < giNumCPUs; i ++ )
365 if(i) gaCPUs[i].Current = NULL;
368 if( (tid = Proc_Clone(0, 0)) == 0)
370 for(;;) HALT(); // Just yeilds
372 gaCPUs[i].IdleThread = Threads_GetThread(tid);
373 gaCPUs[i].IdleThread->ThreadName = "Idle Thread";
374 Threads_SetTickets( gaCPUs[i].IdleThread, 0 ); // Never called randomly
375 gaCPUs[i].IdleThread->Quantum = 1; // 1 slice quantum
379 if( i != giProc_BootProcessorID ) {
384 // BSP still should run the current task
385 gaCPUs[0].Current = &gThreadZero;
387 // Start interrupts and wait for APs to come up
388 Log("Waiting for APs to come up\n");
389 __asm__ __volatile__ ("sti");
390 while( giNumInitingCPUs ) __asm__ __volatile__ ("hlt");
393 if(Proc_Clone(0, 0) == 0)
395 gaCPUs[0].IdleThread = Proc_GetCurThread();
396 gaCPUs[0].IdleThread->ThreadName = (char*)"Idle Thread";
397 Threads_SetPriority( gaCPUs[0].IdleThread, -1 ); // Never called randomly
398 gaCPUs[0].IdleThread->Quantum = 1; // 1 slice quantum
399 for(;;) HALT(); // Just yeilds
403 gaCPUs[0].Current = &gThreadZero;
404 gaCPUs[0].Current->CurCPU = 0;
406 // Start Interrupts (and hence scheduler)
407 __asm__ __volatile__("sti");
409 MM_FinishVirtualInit();
410 Log("Multithreading started");
414 * \fn tThread *Proc_GetCurThread(void)
415 * \brief Gets the current thread
417 tThread *Proc_GetCurThread(void)
420 return gaCPUs[ GetCPUNum() ].Current;
422 return gaCPUs[ 0 ].Current;
427 * \fn void Proc_ChangeStack(void)
428 * \brief Swaps the current stack for a new one (in the proper stack reigon)
430 void Proc_ChangeStack(void)
433 Uint tmp_rbp, old_rsp;
434 Uint curBase, newBase;
436 __asm__ __volatile__ ("mov %%rsp, %0":"=r"(rsp));
437 __asm__ __volatile__ ("mov %%rbp, %0":"=r"(rbp));
442 newBase = MM_NewKStack();
445 Panic("What the?? Unable to allocate space for initial kernel stack");
449 curBase = (Uint)&gInitialKernelStack;
451 Log("curBase = 0x%x, newBase = 0x%x", curBase, newBase);
453 // Get ESP as a used size
455 Log("memcpy( %p, %p, 0x%x )", (void*)(newBase - rsp), (void*)(curBase - rsp), rsp );
457 memcpy( (void*)(newBase - rsp), (void*)(curBase - rsp), rsp );
458 // Get ESP as an offset in the new stack
461 rbp = newBase - (curBase - rbp);
464 // Repair EBPs & Stack Addresses
465 // Catches arguments also, but may trash stack-address-like values
466 for(tmp_rbp = rsp; tmp_rbp < newBase; tmp_rbp += sizeof(Uint))
468 if(old_rsp < *(Uint*)tmp_rbp && *(Uint*)tmp_rbp < curBase)
469 *(Uint*)tmp_rbp += newBase - curBase;
472 Log("Applying Changes");
473 Proc_GetCurThread()->KernelStack = newBase;
474 __asm__ __volatile__ ("mov %0, %%rsp"::"r"(rsp));
475 __asm__ __volatile__ ("mov %0, %%rbp"::"r"(rbp));
479 * \fn int Proc_Clone(Uint *Err, Uint Flags)
480 * \brief Clone the current process
482 int Proc_Clone(Uint *Err, Uint Flags)
485 tThread *cur = Proc_GetCurThread();
488 __asm__ __volatile__ ("mov %%rsp, %0": "=r"(rsp));
489 __asm__ __volatile__ ("mov %%rbp, %0": "=r"(rbp));
491 newThread = Threads_CloneTCB(Err, Flags);
492 if(!newThread) return -1;
494 Log("Proc_Clone: newThread = %p", newThread);
496 // Initialise Memory Space (New Addr space or kernel stack)
497 if(Flags & CLONE_VM) {
498 Log("Proc_Clone: Cloning VM");
499 newThread->MemState.CR3 = MM_Clone();
500 newThread->KernelStack = cur->KernelStack;
502 Uint tmp_rbp, old_rsp = rsp;
505 newThread->MemState.CR3 = cur->MemState.CR3;
508 newThread->KernelStack = MM_NewKStack();
509 Log("Proc_Clone: newKStack = %p", newThread->KernelStack);
511 if(newThread->KernelStack == 0) {
516 // Get ESP as a used size
517 rsp = cur->KernelStack - rsp;
520 (void*)(newThread->KernelStack - rsp),
521 (void*)(cur->KernelStack - rsp),
524 // Get ESP as an offset in the new stack
525 rsp = newThread->KernelStack - rsp;
527 rbp = newThread->KernelStack - (cur->KernelStack - rbp);
529 // Repair EBPs & Stack Addresses
530 // Catches arguments also, but may trash stack-address-like values
531 for(tmp_rbp = rsp; tmp_rbp < newThread->KernelStack; tmp_rbp += sizeof(Uint))
533 if(old_rsp < *(Uint*)tmp_rbp && *(Uint*)tmp_rbp < cur->KernelStack)
534 *(Uint*)tmp_rbp += newThread->KernelStack - cur->KernelStack;
538 // Save core machine state
539 newThread->SavedState.RSP = rsp;
540 newThread->SavedState.RBP = rbp;
542 if(rip == SWITCH_MAGIC) {
543 outb(0x20, 0x20); // ACK Timer and return as child
548 newThread->SavedState.RIP = rip;
550 // Lock list and add to active
551 Threads_AddActive(newThread);
553 return newThread->TID;
557 * \fn int Proc_SpawnWorker(void)
558 * \brief Spawns a new worker thread
560 int Proc_SpawnWorker(void)
565 cur = Proc_GetCurThread();
568 new = malloc( sizeof(tThread) );
570 Warning("Proc_SpawnWorker - Out of heap space!\n");
573 memcpy(new, &gThreadZero, sizeof(tThread));
575 new->TID = giNextTID++;
576 // Create a new worker stack (in PID0's address space)
577 // The stack is relocated by this code
578 new->KernelStack = MM_NewWorkerStack();
580 // Get ESP and EBP based in the new stack
581 __asm__ __volatile__ ("mov %%rsp, %0": "=r"(rsp));
582 __asm__ __volatile__ ("mov %%rbp, %0": "=r"(rbp));
583 rsp = new->KernelStack - (cur->KernelStack - rsp);
584 rbp = new->KernelStack - (cur->KernelStack - rbp);
586 // Save core machine state
587 new->SavedState.RSP = rsp;
588 new->SavedState.RBP = rbp;
590 if(rip == SWITCH_MAGIC) {
591 outb(0x20, 0x20); // ACK Timer and return as child
596 new->SavedState.RIP = rip;
598 new->Status = THREAD_STAT_ACTIVE;
599 Threads_AddActive( new );
605 * \fn Uint Proc_MakeUserStack(void)
606 * \brief Creates a new user stack
608 Uint Proc_MakeUserStack(void)
611 Uint base = USER_STACK_TOP - USER_STACK_SZ;
613 // Check Prospective Space
614 for( i = USER_STACK_SZ >> 12; i--; )
615 if( MM_GetPhysAddr( base + (i<<12) ) != 0 )
618 if(i != -1) return 0;
620 // Allocate Stack - Allocate incrementally to clean up MM_Dump output
621 for( i = 0; i < USER_STACK_SZ/0x1000; i++ )
623 if( !MM_Allocate( base + (i<<12) ) )
626 Log_Error("Proc", "Unable to allocate user stack (%i pages requested)", USER_STACK_SZ/0x1000);
628 MM_Deallocate( base + (i<<12) );
633 return base + USER_STACK_SZ;
638 * \fn void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
639 * \brief Starts a user task
641 void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
643 Uint *stack = (void*)Proc_MakeUserStack();
648 LOG("stack = 0x%x", stack);
651 stack = (void*)( (Uint)stack - DataSize );
652 memcpy( stack, ArgV, DataSize );
654 // Adjust Arguments and environment
655 delta = (Uint)stack - (Uint)ArgV;
656 ArgV = (char**)stack;
657 for( i = 0; ArgV[i]; i++ ) ArgV[i] += delta;
660 for( i = 0; EnvP[i]; i++ ) EnvP[i] += delta;
662 // User Mode Segments
663 ss = 0x23; cs = 0x1B;
666 *--stack = (Uint)EnvP;
667 *--stack = (Uint)ArgV;
668 *--stack = (Uint)ArgC;
671 *--stack = 0; // Return Address
673 Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
676 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
678 Uint *stack = (void*)Stack;
679 *--stack = SS; //Stack Segment
680 *--stack = Stack; //Stack Pointer
681 *--stack = Flags; //EFLAGS (Resvd (0x2) and IF (0x20))
682 *--stack = CS; //Code Segment
685 *--stack = 0xAAAAAAAA; // eax
686 *--stack = 0xCCCCCCCC; // ecx
687 *--stack = 0xDDDDDDDD; // edx
688 *--stack = 0xBBBBBBBB; // ebx
689 *--stack = 0xD1D1D1D1; // edi
690 *--stack = 0x54545454; // rsp - NOT POPED
691 *--stack = 0x51515151; // esi
692 *--stack = 0xB4B4B4B4; // rbp
696 __asm__ __volatile__ (
697 "mov %%rax,%%rsp;\n\t" // Set stack pointer
698 "iret;\n\t" : : "a" (stack));
703 * \fn int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
704 * \brief Demotes a process to a lower permission level
705 * \param Err Pointer to user's errno
706 * \param Dest New Permission Level
707 * \param Regs Pointer to user's register structure
709 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
711 int cpl = Regs->CS & 3;
713 if(Dest > 3 || Dest < 0) {
724 // Change the Segment Registers
725 Regs->CS = (((Dest+1)<<4) | Dest) - 8;
726 Regs->SS = ((Dest+1)<<4) | Dest;
732 * \brief Calls a signal handler in user mode
733 * \note Used for signals
735 void Proc_CallFaultHandler(tThread *Thread)
737 // Rewinds the stack and calls the user function
739 __asm__ __volatile__ ("mov %0, %%rbp;\n\tcall Proc_ReturnToUser" :: "r"(Thread->FaultHandler));
743 void Proc_DumpThreadCPUState(tThread *Thread)
748 * \fn void Proc_Scheduler(int CPU)
749 * \brief Swap current thread and clears dead threads
751 void Proc_Scheduler(int CPU)
756 // If the spinlock is set, let it complete
757 if(IS_LOCKED(&glThreadListLock)) return;
759 // Get current thread
760 thread = gaCPUs[CPU].Current;
762 // Reduce remaining quantum and continue timeslice if non-zero
763 if(thread->Remaining--) return;
764 // Reset quantum for next call
765 thread->Remaining = thread->Quantum;
768 __asm__ __volatile__ ("mov %%rsp, %0":"=r"(rsp));
769 __asm__ __volatile__ ("mov %%rbp, %0":"=r"(rbp));
771 if(rip == SWITCH_MAGIC) return; // Check if a switch happened
773 // Save machine state
774 thread->SavedState.RSP = rsp;
775 thread->SavedState.RBP = rbp;
776 thread->SavedState.RIP = rip;
779 thread = Threads_GetNextToRun(CPU, thread);
783 thread = gaCPUs[CPU].IdleThread;
784 //Warning("Hmm... Threads_GetNextToRun returned NULL, I don't think this should happen.\n");
789 #if DEBUG_TRACE_SWITCH
790 LogF("Switching to task %i, CR3 = 0x%x, RIP = %p",
792 thread->MemState.CR3,
793 thread->SavedState.RIP
799 LogF("CPU = %i", CPU);
800 // Set current thread
801 gaCPUs[CPU].Current = thread;
803 // Update Kernel Stack pointer
804 gTSSs[CPU].RSP0 = thread->KernelStack-4;
807 __asm__ __volatile__ ("mov %0, %%cr3"::"a"(thread->MemState.CR3));
810 __asm__ __volatile__ (
811 "mov %1, %%rsp\n\t" // Restore RSP
812 "mov %2, %%rbp\n\t" // and RBP
813 "jmp *%3" : : // And return to where we saved state (Proc_Clone or Proc_Scheduler)
814 "a"(SWITCH_MAGIC), "b"(thread->SavedState.RSP),
815 "d"(thread->SavedState.RBP), "c"(thread->SavedState.RIP)
817 for(;;); // Shouldn't reach here
821 EXPORT(Proc_SpawnWorker);