3 * - By John Hodge (thePowersGang)
6 * - Low level thread management
23 #define DEBUG_TRACE_SWITCH 0
24 #define DEBUG_DISABLE_DOUBLEFAULT 1
25 #define DEBUG_VERY_SLOW_PERIOD 0
26 #define DEBUG_NOPREEMPT 1
31 #define TIMER_BASE 1193182
33 # define TIMER_DIVISOR 0xFFFF
34 #elif DEBUG_VERY_SLOW_PERIOD
35 # define TIMER_DIVISOR 1193 //~10Hz switch, with 10 quantum = 1s per thread
37 # define TIMER_DIVISOR 11932 //~100Hz
45 extern void APWait(void); // 16-bit AP pause code
46 extern void APStartup(void); // 16-bit AP startup code
47 extern Uint Proc_CloneInt(Uint *ESP, Uint32 *CR3, int bNoUserClone);
48 extern Uint32 gaInitPageDir[1024]; // start.asm
49 extern char Kernel_Stack_Top[];
51 extern tThread gThreadZero;
52 extern tProcess gProcessZero;
53 extern void Isr8(void); // Double Fault
54 extern void Proc_ReturnToUser(tVAddr Handler, Uint Argument, tVAddr KernelStack);
55 extern char scheduler_return[]; // Return address in SchedulerBase
56 extern char IRQCommon[]; // Common IRQ handler code
57 extern char IRQCommon_handled[]; // IRQCommon call return location
58 extern char GetEIP_Sched_ret[]; // GetEIP call return location
59 extern void Timer_CallTimers(void);
62 //void ArchThreads_Init(void);
64 void MP_StartAP(int CPU);
65 void MP_SendIPIVector(int CPU, Uint8 Vector);
66 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
68 void Proc_IdleThread(void *Ptr);
69 //void Proc_Start(void);
70 //tThread *Proc_GetCurThread(void);
71 void Proc_ChangeStack(void);
72 // int Proc_NewKThread(void (*Fcn)(void*), void *Data);
73 void NewTaskHeader(tThread *Thread, void (*Fcn)(void*), void *Data); // Actually takes cdecl args
74 // int Proc_Clone(Uint *Err, Uint Flags);
75 Uint Proc_MakeUserStack(void);
76 //void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize);
77 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP) NORETURN;
78 void Proc_CallUser(Uint32 UserIP, Uint32 UserSP, const void *StackData, size_t StackDataLen);
79 //void Proc_CallFaultHandler(tThread *Thread);
80 //void Proc_DumpThreadCPUState(tThread *Thread);
81 void Proc_HandleEventTimer(int CPU);
84 // --- Multiprocessing ---
86 volatile int giNumInitingCPUs = 0;
87 volatile Uint32 giMP_TimerCount; // Start Count for Local APIC Timer
88 tAPIC *gpMP_LocalAPIC = NULL;
89 Uint8 gaAPIC_to_CPU[256] = {0};
90 int giProc_BootProcessorID = 0;
91 tTSS gaTSSs[MAX_CPUS]; // TSS Array
93 tCPU gaCPUs[MAX_CPUS] = {
94 {.Current = &gThreadZero}
96 tTSS *gTSSs = NULL; // Pointer to TSS array
98 // --- Error Recovery ---
99 char gaDoubleFaultStack[1024] __attribute__ ((section(".padata")));
100 tTSS gDoubleFault_TSS = {
101 .ESP0 = (Uint)&gaDoubleFaultStack[1024],
103 .CR3 = (Uint)gaInitPageDir - KERNEL_BASE,
105 .ESP = (Uint)&gaDoubleFaultStack[1024],
106 .CS = 0x08, .SS = 0x10,
107 .DS = 0x10, .ES = 0x10,
108 .FS = 0x10, .GS = 0x10,
113 * \fn void ArchThreads_Init(void)
114 * \brief Starts the process scheduler
116 void ArchThreads_Init(void)
118 // Mark BSP as active
122 // -- Initialise Multiprocessing
123 const void *mpfloatptr = MPTable_LocateFloatPtr();
126 giNumCPUs = MPTable_FillCPUs(mpfloatptr, gaCPUs, MAX_CPUS, &giProc_BootProcessorID);
127 for( int i = 0; i < giNumCPUs; i ++ )
129 // TODO: Determine if there's an overlap
130 gaAPIC_to_CPU[gaCPUs[i].APICID] = i;
136 Log("No MP Table was found, assuming uniprocessor");
145 #if !DEBUG_DISABLE_DOUBLEFAULT
146 // Initialise Double Fault TSS
147 gGDT[5].BaseLow = (Uint)&gDoubleFault_TSS & 0xFFFF;
148 gGDT[5].BaseMid = (Uint)&gDoubleFault_TSS >> 16;
149 gGDT[5].BaseHi = (Uint)&gDoubleFault_TSS >> 24;
151 // Set double fault IDT to use the new TSS
152 gIDT[8].OffsetLo = 0;
154 gIDT[8].Flags = 0x8500;
155 gIDT[8].OffsetHi = 0;
158 // Set timer frequency
159 outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator
160 outb(0x40, TIMER_DIVISOR&0xFF); // Low Byte of Divisor
161 outb(0x40, (TIMER_DIVISOR>>8)&0xFF); // High Byte
163 Log_Debug("Proc", "PIT Frequency %i.%03i Hz",
164 TIMER_BASE/TIMER_DIVISOR,
165 ((Uint64)TIMER_BASE*1000/TIMER_DIVISOR)%1000
169 // Get the count setting for APIC timer
170 Log("Determining APIC Count");
171 __asm__ __volatile__ ("sti");
172 while( giMP_TimerCount == 0 ) __asm__ __volatile__ ("hlt");
173 __asm__ __volatile__ ("cli");
174 Log("APIC Count %i", giMP_TimerCount);
176 Uint64 freq = giMP_TimerCount;
178 freq /= TIMER_DIVISOR;
179 if( (freq /= 1000) < 2*1000)
180 Log("Bus Frequency %i KHz", freq);
181 else if( (freq /= 1000) < 2*1000)
182 Log("Bus Frequency %i MHz", freq);
183 else if( (freq /= 1000) < 2*1000)
184 Log("Bus Frequency %i GHz", freq);
186 Log("Bus Frequency %i THz", freq);
189 // Initialise Normal TSS(s)
190 for(int pos=0;pos<giNumCPUs;pos++)
195 gTSSs[pos].SS0 = 0x10;
196 gTSSs[pos].ESP0 = 0; // Set properly by scheduler
197 gGDT[6+pos].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
198 gGDT[6+pos].BaseMid = ((Uint)(&gTSSs[pos]) >> 16) & 0xFFFF;
199 gGDT[6+pos].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
204 // Load the BSP's TSS
205 __asm__ __volatile__ ("ltr %%ax"::"a"(0x30));
206 // Set Current Thread and CPU Number in DR0 and DR1
207 __asm__ __volatile__ ("mov %0, %%db0"::"r"(&gThreadZero));
208 __asm__ __volatile__ ("mov %0, %%db1"::"r"(0));
210 gaCPUs[0].Current = &gThreadZero;
211 gThreadZero.CurCPU = 0;
213 gProcessZero.MemState.CR3 = (Uint)gaInitPageDir - KERNEL_BASE;
215 // Create Per-Process Data Block
216 if( MM_Allocate( (void*)MM_PPD_CFG ) == 0 )
218 Panic("OOM - No space for initial Per-Process Config");
221 // Initialise SSE support
222 Proc_InitialiseSSE();
232 void MP_StartAP(int CPU)
234 Log_Log("Proc", "Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID);
236 // Set location of AP startup code and mark for a warm restart
237 *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APWait - (KERNEL_BASE|0xFFFF0);
238 *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
239 outb(0x70, 0x0F); outb(0x71, 0x0A); // Set warm reset flag
240 MP_SendIPI(gaCPUs[CPU].APICID, 0, 5); // Init IPI
242 // Take a quick nap (20ms)
245 // TODO: Use a better address, preferably registered with the MM
246 // - MM_AllocDMA mabye?
248 *(Uint8*)(KERNEL_BASE|0x11000) = 0xEA; // Far JMP
249 *(Uint16*)(KERNEL_BASE|0x11001) = (Uint16)(tVAddr)&APStartup + 0x10; // IP
250 *(Uint16*)(KERNEL_BASE|0x11003) = 0xFFFF; // CS
254 // Send a Startup-IPI to make the CPU execute at 0x11000 (which we
256 MP_SendIPI(gaCPUs[CPU].APICID, 0x11, 6); // StartupIPI
258 tTime timeout = now() + 2;
259 while( giNumInitingCPUs && now() > timeout )
262 if( giNumInitingCPUs == 0 )
265 // First S-IPI failed, send again
266 MP_SendIPI(gaCPUs[CPU].APICID, 0x11, 6);
268 while( giNumInitingCPUs && now() > timeout )
270 if( giNumInitingCPUs == 0 )
273 Log_Notice("Proc", "CPU %i (APIC %x) didn't come up", CPU, gaCPUs[CPU].APICID);
276 giNumInitingCPUs = 0;
279 void MP_SendIPIVector(int CPU, Uint8 Vector)
281 MP_SendIPI(gaCPUs[CPU].APICID, Vector, 0);
285 * \brief Send an Inter-Processor Interrupt
286 * \param APICID Processor's Local APIC ID
287 * \param Vector Argument of some kind
288 * \param DeliveryMode Type of signal
289 * \note 3A 10.5 "APIC/Handling Local Interrupts"
291 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
296 val = (Uint)APICID << 24;
297 gpMP_LocalAPIC->ICR[1].Val = val;
299 val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF);
300 gpMP_LocalAPIC->ICR[0].Val = val;
304 void Proc_IdleThread(void *Ptr)
306 tCPU *cpu = &gaCPUs[GetCPUNum()];
307 cpu->Current->ThreadName = strdup("Idle Thread");
308 Threads_SetPriority( cpu->Current, -1 ); // Never called randomly
309 cpu->Current->Quantum = 1; // 1 slice quantum
310 LOG("Idle thread for CPU %i ready", GetCPUNum());
313 __asm__ __volatile__ ("sti"); // Make sure interrupts are enabled
314 Proc_Reschedule(); // Reshedule
315 __asm__ __volatile__ ("hlt"); // And wait for an interrupt if we get scheduled again
320 * \fn void Proc_Start(void)
321 * \brief Start process scheduler
323 void Proc_Start(void)
326 // BSP still should run the current task
327 gaCPUs[giProc_BootProcessorID].Current = &gThreadZero;
329 __asm__ __volatile__ ("sti");
332 for( int i = 0; i < giNumCPUs; i ++ )
334 if(i != giProc_BootProcessorID)
335 gaCPUs[i].Current = NULL;
338 Proc_NewKThread(Proc_IdleThread, &gaCPUs[i]);
341 if( i != giProc_BootProcessorID ) {
347 Proc_NewKThread(Proc_IdleThread, &gaCPUs[0]);
350 gaCPUs[0].Current = &gThreadZero;
352 // Start Interrupts (and hence scheduler)
353 __asm__ __volatile__("sti");
355 MM_FinishVirtualInit();
359 * \fn tThread *Proc_GetCurThread(void)
360 * \brief Gets the current thread
362 tThread *Proc_GetCurThread(void)
365 return gaCPUs[ GetCPUNum() ].Current;
367 return gaCPUs[ 0 ].Current;
372 * \fn void Proc_ChangeStack(void)
373 * \brief Swaps the current stack for a new one (in the proper stack reigon)
375 void Proc_ChangeStack(void)
379 Uint curBase, newBase;
381 __asm__ __volatile__ ("mov %%esp, %0":"=r"(esp));
382 __asm__ __volatile__ ("mov %%ebp, %0":"=r"(ebp));
387 newBase = MM_NewKStack();
390 Panic("What the?? Unable to allocate space for initial kernel stack");
394 curBase = (Uint)&Kernel_Stack_Top;
396 LOG("curBase = 0x%x, newBase = 0x%x", curBase, newBase);
398 // Get ESP as a used size
400 LOG("memcpy( %p, %p, 0x%x )", (void*)(newBase - esp), (void*)(curBase - esp), esp );
402 memcpy( (void*)(newBase - esp), (void*)(curBase - esp), esp );
403 // Get ESP as an offset in the new stack
406 ebp = newBase - (curBase - ebp);
408 // Repair EBPs & Stack Addresses
409 // Catches arguments also, but may trash stack-address-like values
410 for(tmpEbp = esp; tmpEbp < newBase; tmpEbp += 4)
412 if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < curBase)
413 *(Uint*)tmpEbp += newBase - curBase;
416 Proc_GetCurThread()->KernelStack = newBase;
418 __asm__ __volatile__ ("mov %0, %%esp"::"r"(esp));
419 __asm__ __volatile__ ("mov %0, %%ebp"::"r"(ebp));
422 void Proc_ClearProcess(tProcess *Process)
424 MM_ClearSpace(Process->MemState.CR3);
427 void Proc_ClearThread(tThread *Thread)
429 if(Thread->SavedState.SSE) {
430 free(Thread->SavedState.SSE);
431 Thread->SavedState.SSE = NULL;
435 tTID Proc_NewKThread(void (*Fcn)(void*), void *Data)
437 tThread *newThread = Threads_CloneTCB(0);
438 if(!newThread) return -1;
441 newThread->KernelStack = MM_NewKStack();
443 if(newThread->KernelStack == 0) {
448 LOG("%p(%i %s) SP=%p", newThread, newThread->TID, newThread->ThreadName, newThread->KernelStack);
450 Uint esp = newThread->KernelStack;
451 *(Uint*)(esp-=4) = (Uint)Data; // Data (shadowed)
452 *(Uint*)(esp-=4) = (Uint)Fcn; // Function to call
453 *(Uint*)(esp-=4) = (Uint)newThread; // Thread ID
454 *(Uint*)(esp-=4) = (Uint)0; // Empty return address
456 newThread->SavedState.ESP = esp;
457 newThread->SavedState.EIP = (Uint)&NewTaskHeader;
458 newThread->SavedState.SSE = NULL;
459 // Log("New (KThread) %p, esp = %p", newThread->SavedState.EIP, newThread->SavedState.ESP);
462 Threads_AddActive(newThread);
464 return newThread->TID;
467 void NewTaskHeader(tThread *NewThread, void (*Fcn)(void*), void *Data)
469 LOG("NewThread=%p, Fcn=%p, Data=%p", NewThread, Fcn, Data);
470 __asm__ __volatile__ ("mov %0, %%dr0" : : "r"(NewThread));
471 SHORTREL(&glThreadListLock);
479 * \fn int Proc_Clone(Uint *Err, Uint Flags)
480 * \brief Clone the current process
482 tPID Proc_Clone(Uint Flags)
484 tThread *cur = Proc_GetCurThread();
487 if( !(Flags & CLONE_VM) ) {
488 Log_Error("Proc", "Proc_Clone: Don't leave CLONE_VM unset, use Proc_NewKThread instead");
493 tThread *newThread = Threads_CloneTCB(Flags);
494 if(!newThread) return -1;
495 ASSERT(newThread->Process);
497 newThread->KernelStack = cur->KernelStack;
500 Uint eip = Proc_CloneInt(&newThread->SavedState.ESP, &newThread->Process->MemState.CR3, Flags & CLONE_NOUSER);
502 SHORTREL( &glThreadListLock );
503 LOG("In new thread");
506 //ASSERT(newThread->Process);
507 //ASSERT(CheckMem(newThread->Process, sizeof(tProcess)));
508 //LOG("newThread->Process = %p", newThread->Process);
509 newThread->SavedState.EIP = eip;
510 newThread->SavedState.SSE = NULL;
511 newThread->SavedState.bSSEModified = 0;
514 if( newThread->Process->MemState.CR3 == 0 ) {
515 Log_Error("Proc", "Proc_Clone: MM_Clone failed");
516 Threads_Delete(newThread);
520 // Add the new thread to the run queue
521 Threads_AddActive(newThread);
522 return newThread->TID;
526 * \fn int Proc_SpawnWorker(void)
527 * \brief Spawns a new worker thread
529 tThread *Proc_SpawnWorker(void (*Fcn)(void*), void *Data)
531 Uint stack_contents[4];
532 LOG("(Fcn=%p,Data=%p)", Fcn, Data);
535 tThread *new = Threads_CloneThreadZero();
538 Warning("Proc_SpawnWorker - Out of heap space!\n");
541 LOG("new = (%i %s)", new->TID, new->ThreadName);
543 // Create the stack contents
544 stack_contents[3] = (Uint)Data;
545 stack_contents[2] = (Uint)Fcn;
546 stack_contents[1] = (Uint)new;
547 stack_contents[0] = 0;
549 // Create a new worker stack (in PID0's address space)
550 new->KernelStack = MM_NewWorkerStack(stack_contents, sizeof(stack_contents));
551 LOG("new->KernelStack = %p", new->KernelStack);
553 // Save core machine state
554 new->SavedState.ESP = new->KernelStack - sizeof(stack_contents);
555 new->SavedState.EIP = (Uint)NewTaskHeader;
556 new->SavedState.SSE = NULL;
557 new->SavedState.bSSEModified = 0;
560 new->Status = THREAD_STAT_PREINIT;
561 Threads_AddActive( new );
562 LOG("Added to active");
568 * \fn Uint Proc_MakeUserStack(void)
569 * \brief Creates a new user stack
571 Uint Proc_MakeUserStack(void)
573 tPage *base = (void*)(USER_STACK_TOP - USER_STACK_SZ);
575 // Check Prospective Space
576 for( Uint i = USER_STACK_SZ/PAGE_SIZE; i--; )
578 if( MM_GetPhysAddr( base + i ) != 0 )
580 Warning("Proc_MakeUserStack: Address %p in use", base + i);
584 // Allocate Stack - Allocate incrementally to clean up MM_Dump output
585 for( Uint i = 0; i < USER_STACK_SZ/PAGE_SIZE; i++ )
587 if( MM_Allocate( base + i ) == 0 )
589 Warning("OOM: Proc_MakeUserStack");
594 return (tVAddr)( base + USER_STACK_SZ/PAGE_SIZE );
597 void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, const char **ArgV, int DataSize)
601 const char **envp = NULL;
604 // Copy data to the user stack and free original buffer
605 stack = (void*)Proc_MakeUserStack();
606 stack -= (DataSize+sizeof(*stack)-1)/sizeof(*stack);
607 memcpy( stack, ArgV, DataSize );
610 // Adjust Arguments and environment
613 Uint delta = (Uint)stack - (Uint)ArgV;
614 ArgV = (const char**)stack;
615 for( i = 0; ArgV[i]; i++ ) ArgV[i] += delta;
617 for( i = 0; envp[i]; i++ ) envp[i] += delta;
620 // User Mode Segments
621 ss = 0x23; cs = 0x1B;
624 *--stack = (Uint)envp;
625 *--stack = (Uint)ArgV;
626 *--stack = (Uint)ArgC;
629 Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
632 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
634 Uint *stack = (void*)Stack;
635 *--stack = SS; //Stack Segment
636 *--stack = Stack; //Stack Pointer
637 *--stack = Flags; //EFLAGS (Resvd (0x2) and IF (0x20))
638 *--stack = CS; //Code Segment
641 *--stack = 0xAAAAAAAA; // eax
642 *--stack = 0xCCCCCCCC; // ecx
643 *--stack = 0xDDDDDDDD; // edx
644 *--stack = 0xBBBBBBBB; // ebx
645 *--stack = 0xD1D1D1D1; // edi
646 *--stack = 0x54545454; // esp - NOT POPED
647 *--stack = 0x51515151; // esi
648 *--stack = 0xB4B4B4B4; // ebp
655 __asm__ __volatile__ (
656 "mov %%eax,%%esp;\n\t" // Set stack pointer
662 "iret;\n\t" : : "a" (stack));
666 void Proc_CallUser(Uint32 UserIP, Uint32 UserSP, const void *StackData, size_t StackDataLen)
668 if( UserSP < StackDataLen )
670 if( !CheckMem( (void*)(UserSP - StackDataLen), StackDataLen ) )
672 memcpy( (void*)(UserSP - StackDataLen), StackData, StackDataLen );
674 __asm__ __volatile__ (
675 "mov $0x23,%%ax;\n\t"
676 "mov %%ax, %%ds;\n\t"
677 "mov %%ax, %%es;\n\t"
678 "mov %%ax, %%fs;\n\t"
679 "mov %%ax, %%gs;\n\t"
687 : "r" (UserIP), "r" (UserSP - StackDataLen)
695 * \brief Calls a signal handler in user mode
696 * \note Used for signals
698 void Proc_CallFaultHandler(tThread *Thread)
700 // Rewinds the stack and calls the user function
702 Proc_ReturnToUser( Thread->FaultHandler, Thread->CurFaultNum, Thread->KernelStack );
706 void Proc_DumpThreadCPUState(tThread *Thread)
708 if( Thread->CurCPU > -1 )
710 int maxBacktraceDistance = 6;
714 if( Thread->CurCPU != GetCPUNum() ) {
715 Log(" Currently running");
719 // Backtrace to find the IRQ entrypoint
720 // - This will usually only be called by an IRQ, so this should
722 __asm__ __volatile__ ("mov %%ebp, %0" : "=r" (stack));
723 while( maxBacktraceDistance -- )
725 if( !CheckMem(stack, 8) ) {
732 if( stack[1] == (tVAddr)&IRQCommon_handled ) {
733 regs = (void*)stack[2];
737 stack = (void*)stack[0];
741 Log(" Unable to find IRQ Entry");
745 Log(" at %04x:%08x [EAX:%x]", regs->cs, regs->eip, regs->eax);
746 Error_Backtrace(regs->eip, regs->ebp);
750 Log(" Saved = %p (SP=%p)", Thread->SavedState.EIP, Thread->SavedState.ESP);
752 tVAddr diffFromScheduler = Thread->SavedState.EIP - (tVAddr)SwitchTasks;
753 tVAddr diffFromClone = Thread->SavedState.EIP - (tVAddr)Proc_CloneInt;
754 tVAddr diffFromSpawn = Thread->SavedState.EIP - (tVAddr)NewTaskHeader;
756 if( diffFromClone > 0 && diffFromClone < 40 ) // When I last checked, .newTask was at .+27
758 Log(" Creating process");
762 if( diffFromSpawn == 0 )
764 Log(" Creating thread");
768 if( diffFromScheduler > 0 && diffFromScheduler < 128 ) // When I last checked, GetEIP was at .+0x30
771 Log(" At %04x:%08x", Thread->SavedState.UserCS, Thread->SavedState.UserEIP);
775 Log(" Just created (unknown %p)", Thread->SavedState.EIP);
778 void Proc_Reschedule(void)
780 int cpu = GetCPUNum();
782 // TODO: Wait for the lock?
783 if(IS_LOCKED(&glThreadListLock)) {
784 LOG("Thread list locked, not rescheduling");
788 SHORTLOCK(&glThreadListLock);
790 tThread *curthread = Proc_GetCurThread();
791 tThread *nextthread = Threads_GetNextToRun(cpu, curthread);
793 if(nextthread && nextthread != curthread)
795 #if DEBUG_TRACE_SWITCH
796 // HACK: Ignores switches to the idle threads
797 //if( nextthread->TID == 0 || nextthread->TID > giNumCPUs )
799 LogF("\nSwitching CPU %i to %p (%i %s) - CR3 = 0x%x, EIP = %p, ESP = %p\n",
801 nextthread, nextthread->TID, nextthread->ThreadName,
802 nextthread->Process->MemState.CR3,
803 nextthread->SavedState.EIP,
804 nextthread->SavedState.ESP
806 LogF(" from %p (%i %s) - CR3 = 0x%x, EIP = %p, ESP = %p\n",
807 curthread, curthread->TID, curthread->ThreadName,
808 curthread->Process->MemState.CR3,
809 curthread->SavedState.EIP,
810 curthread->SavedState.ESP
816 gaCPUs[cpu].Current = nextthread;
817 gaCPUs[cpu].LastTimerThread = NULL;
818 gTSSs[cpu].ESP0 = nextthread->KernelStack-4;
819 __asm__ __volatile__("mov %0, %%db0\n\t" : : "r"(nextthread) );
821 // Save FPU/MMX/XMM/SSE state
822 if( curthread && curthread->SavedState.SSE )
824 Proc_SaveSSE( ((Uint)curthread->SavedState.SSE + 0xF) & ~0xF );
825 curthread->SavedState.bSSEModified = 0;
832 nextthread->SavedState.ESP, &curthread->SavedState.ESP,
833 nextthread->SavedState.EIP, &curthread->SavedState.EIP,
834 nextthread->Process->MemState.CR3
840 nextthread->SavedState.ESP, 0,
841 nextthread->SavedState.EIP, 0,
842 nextthread->Process->MemState.CR3
847 SHORTREL(&glThreadListLock);
851 * \brief Handle the per-CPU timer ticking
854 void Proc_HandleEventTimer(int CPU)
856 // Call the timer update code
860 // If two ticks happen within the same task, and it's not an idle task, swap
861 if( gaCPUs[CPU].Current->TID > giNumCPUs && gaCPUs[CPU].Current == gaCPUs[CPU].LastTimerThread )
863 const tThread* const t = gaCPUs[CPU].Current;
864 LOG("Preempting thread %p(%i %s)", t, t->TID, t->ThreadName);
868 gaCPUs[CPU].LastTimerThread = gaCPUs[CPU].Current;
873 EXPORT(Proc_SpawnWorker);