2 * AcessOS Microkernel Version
18 #define DEBUG_TRACE_SWITCH 0
19 #define DEBUG_DISABLE_DOUBLEFAULT 1
20 #define DEBUG_VERY_SLOW_PERIOD 0
24 #define TIMER_BASE 1193182
25 #if DEBUG_VERY_SLOW_PERIOD
26 # define TIMER_DIVISOR 1193 //~10Hz switch, with 10 quantum = 1s per thread
28 # define TIMER_DIVISOR 11932 //~100Hz
35 Uint8 State; // 0: Unavaliable, 1: Idle, 2: Active
38 tThread *LastTimerThread; // Used to do preeemption
44 extern void APWait(void); // 16-bit AP pause code
45 extern void APStartup(void); // 16-bit AP startup code
46 extern Uint GetEIP(void); // start.asm
47 extern Uint GetEIP_Sched(void); // proc.asm
48 extern void NewTaskHeader(tThread *Thread, void *Fcn, int nArgs, ...); // Actually takes cdecl args
49 extern Uint Proc_CloneInt(Uint *ESP, Uint32 *CR3, int bNoUserClone);
50 extern Uint32 gaInitPageDir[1024]; // start.asm
51 extern char Kernel_Stack_Top[];
54 extern tThread gThreadZero;
55 extern tProcess gProcessZero;
56 extern void Isr8(void); // Double Fault
57 extern void Proc_ReturnToUser(tVAddr Handler, Uint Argument, tVAddr KernelStack);
58 extern char scheduler_return[]; // Return address in SchedulerBase
59 extern char IRQCommon[]; // Common IRQ handler code
60 extern char IRQCommon_handled[]; // IRQCommon call return location
61 extern char GetEIP_Sched_ret[]; // GetEIP call return location
62 extern void SwitchTasks(Uint NewSP, Uint *OldSP, Uint NewIP, Uint *OldIO, Uint CR3);
63 extern void Proc_InitialiseSSE(void);
64 extern void Proc_SaveSSE(Uint DestPtr);
65 extern void Proc_DisableSSE(void);
68 //void ArchThreads_Init(void);
70 void MP_StartAP(int CPU);
71 void MP_SendIPIVector(int CPU, Uint8 Vector);
72 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
74 void Proc_IdleThread(void *Ptr);
75 //void Proc_Start(void);
76 //tThread *Proc_GetCurThread(void);
77 void Proc_ChangeStack(void);
78 // int Proc_NewKThread(void (*Fcn)(void*), void *Data);
79 // int Proc_Clone(Uint *Err, Uint Flags);
80 Uint Proc_MakeUserStack(void);
81 //void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize);
82 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP) NORETURN;
83 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs);
84 //void Proc_CallFaultHandler(tThread *Thread);
85 //void Proc_DumpThreadCPUState(tThread *Thread);
86 void Proc_Scheduler(int CPU);
89 // --- Multiprocessing ---
91 volatile int giNumInitingCPUs = 0;
92 tMPInfo *gMPFloatPtr = NULL;
93 volatile Uint32 giMP_TimerCount; // Start Count for Local APIC Timer
94 tAPIC *gpMP_LocalAPIC = NULL;
95 Uint8 gaAPIC_to_CPU[256] = {0};
96 int giProc_BootProcessorID = 0;
97 tTSS gaTSSs[MAX_CPUS]; // TSS Array
99 tCPU gaCPUs[MAX_CPUS] = {
100 {.Current = &gThreadZero}
102 tTSS *gTSSs = NULL; // Pointer to TSS array
104 // --- Error Recovery ---
105 char gaDoubleFaultStack[1024] __attribute__ ((section(".padata")));
106 tTSS gDoubleFault_TSS = {
107 .ESP0 = (Uint)&gaDoubleFaultStack[1024],
109 .CR3 = (Uint)gaInitPageDir - KERNEL_BASE,
111 .ESP = (Uint)&gaDoubleFaultStack[1024],
112 .CS = 0x08, .SS = 0x10,
113 .DS = 0x10, .ES = 0x10,
114 .FS = 0x10, .GS = 0x10,
119 * \fn void ArchThreads_Init(void)
120 * \brief Starts the process scheduler
122 void ArchThreads_Init(void)
129 // Mark BSP as active
132 // -- Initialise Multiprocessing
133 // Find MP Floating Table
134 // - EBDA/Last 1Kib (640KiB)
135 for(pos = KERNEL_BASE|0x9F000; pos < (KERNEL_BASE|0xA0000); pos += 16) {
136 if( *(Uint*)(pos) == MPPTR_IDENT ) {
137 Log("Possible %p", pos);
138 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
139 gMPFloatPtr = (void*)pos;
143 // - Last KiB (512KiB base mem)
145 for(pos = KERNEL_BASE|0x7F000; pos < (KERNEL_BASE|0x80000); pos += 16) {
146 if( *(Uint*)(pos) == MPPTR_IDENT ) {
147 Log("Possible %p", pos);
148 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
149 gMPFloatPtr = (void*)pos;
156 for(pos = KERNEL_BASE|0xE0000; pos < (KERNEL_BASE|0x100000); pos += 16) {
157 if( *(Uint*)(pos) == MPPTR_IDENT ) {
158 Log("Possible %p", pos);
159 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
160 gMPFloatPtr = (void*)pos;
166 // If the MP Table Exists, parse it
172 Log("gMPFloatPtr = %p", gMPFloatPtr);
173 Log("*gMPFloatPtr = {");
174 Log("\t.Sig = 0x%08x", gMPFloatPtr->Sig);
175 Log("\t.MPConfig = 0x%08x", gMPFloatPtr->MPConfig);
176 Log("\t.Length = 0x%02x", gMPFloatPtr->Length);
177 Log("\t.Version = 0x%02x", gMPFloatPtr->Version);
178 Log("\t.Checksum = 0x%02x", gMPFloatPtr->Checksum);
179 Log("\t.Features = [0x%02x,0x%02x,0x%02x,0x%02x,0x%02x]",
180 gMPFloatPtr->Features[0], gMPFloatPtr->Features[1],
181 gMPFloatPtr->Features[2], gMPFloatPtr->Features[3],
182 gMPFloatPtr->Features[4]
187 mptable = (void*)( KERNEL_BASE|gMPFloatPtr->MPConfig );
189 Log("mptable = %p", mptable);
191 Log("\t.Sig = 0x%08x", mptable->Sig);
192 Log("\t.BaseTableLength = 0x%04x", mptable->BaseTableLength);
193 Log("\t.SpecRev = 0x%02x", mptable->SpecRev);
194 Log("\t.Checksum = 0x%02x", mptable->Checksum);
195 Log("\t.OEMID = '%8c'", mptable->OemID);
196 Log("\t.ProductID = '%8c'", mptable->ProductID);
197 Log("\t.OEMTablePtr = %p'", mptable->OEMTablePtr);
198 Log("\t.OEMTableSize = 0x%04x", mptable->OEMTableSize);
199 Log("\t.EntryCount = 0x%04x", mptable->EntryCount);
200 Log("\t.LocalAPICMemMap = 0x%08x", mptable->LocalAPICMemMap);
201 Log("\t.ExtendedTableLen = 0x%04x", mptable->ExtendedTableLen);
202 Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum);
206 gpMP_LocalAPIC = (void*)MM_MapHWPages(mptable->LocalAPICMemMap, 1);
208 ents = mptable->Entries;
211 for( i = 0; i < mptable->EntryCount; i ++ )
219 Log("%i: Processor", i);
220 Log("\t.APICID = %i", ents->Proc.APICID);
221 Log("\t.APICVer = 0x%02x", ents->Proc.APICVer);
222 Log("\t.CPUFlags = 0x%02x", ents->Proc.CPUFlags);
223 Log("\t.CPUSignature = 0x%08x", ents->Proc.CPUSignature);
224 Log("\t.FeatureFlags = 0x%08x", ents->Proc.FeatureFlags);
227 if( !(ents->Proc.CPUFlags & 1) ) {
232 // Check if there is too many processors
233 if(giNumCPUs >= MAX_CPUS) {
234 giNumCPUs ++; // If `giNumCPUs` > MAX_CPUS later, it will be clipped
238 // Initialise CPU Info
239 gaAPIC_to_CPU[ents->Proc.APICID] = giNumCPUs;
240 gaCPUs[giNumCPUs].APICID = ents->Proc.APICID;
241 gaCPUs[giNumCPUs].State = 0;
245 if( ents->Proc.CPUFlags & 2 ) {
246 giProc_BootProcessorID = giNumCPUs-1;
251 #if DUMP_MP_TABLE >= 2
255 Log("\t.ID = %i", ents->Bus.ID);
256 Log("\t.TypeString = '%6C'", ents->Bus.TypeString);
260 Log("%i: I/O APIC", i);
261 Log("\t.ID = %i", ents->IOAPIC.ID);
262 Log("\t.Version = 0x%02x", ents->IOAPIC.Version);
263 Log("\t.Flags = 0x%02x", ents->IOAPIC.Flags);
264 Log("\t.Addr = 0x%08x", ents->IOAPIC.Addr);
266 case 3: // I/O Interrupt Assignment
268 Log("%i: I/O Interrupt Assignment", i);
269 Log("\t.IntType = %i", ents->IOInt.IntType);
270 Log("\t.Flags = 0x%04x", ents->IOInt.Flags);
271 Log("\t.SourceBusID = 0x%02x", ents->IOInt.SourceBusID);
272 Log("\t.SourceBusIRQ = 0x%02x", ents->IOInt.SourceBusIRQ);
273 Log("\t.DestAPICID = 0x%02x", ents->IOInt.DestAPICID);
274 Log("\t.DestAPICIRQ = 0x%02x", ents->IOInt.DestAPICIRQ);
276 case 4: // Local Interrupt Assignment
278 Log("%i: Local Interrupt Assignment", i);
279 Log("\t.IntType = %i", ents->LocalInt.IntType);
280 Log("\t.Flags = 0x%04x", ents->LocalInt.Flags);
281 Log("\t.SourceBusID = 0x%02x", ents->LocalInt.SourceBusID);
282 Log("\t.SourceBusIRQ = 0x%02x", ents->LocalInt.SourceBusIRQ);
283 Log("\t.DestLocalAPICID = 0x%02x", ents->LocalInt.DestLocalAPICID);
284 Log("\t.DestLocalAPICIRQ = 0x%02x", ents->LocalInt.DestLocalAPICIRQ);
287 Log("%i: Unknown (%i)", i, ents->Type);
291 ents = (void*)( (Uint)ents + entSize );
294 if( giNumCPUs > MAX_CPUS ) {
295 Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS);
296 giNumCPUs = MAX_CPUS;
301 Log("No MP Table was found, assuming uniprocessor\n");
310 #if !DEBUG_DISABLE_DOUBLEFAULT
311 // Initialise Double Fault TSS
312 gGDT[5].BaseLow = (Uint)&gDoubleFault_TSS & 0xFFFF;
313 gGDT[5].BaseMid = (Uint)&gDoubleFault_TSS >> 16;
314 gGDT[5].BaseHi = (Uint)&gDoubleFault_TSS >> 24;
316 // Set double fault IDT to use the new TSS
317 gIDT[8].OffsetLo = 0;
319 gIDT[8].Flags = 0x8500;
320 gIDT[8].OffsetHi = 0;
323 // Set timer frequency
324 outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator
325 outb(0x40, TIMER_DIVISOR&0xFF); // Low Byte of Divisor
326 outb(0x40, (TIMER_DIVISOR>>8)&0xFF); // High Byte
328 Log_Debug("Proc", "PIT Frequency %i.%03i Hz",
329 TIMER_BASE/TIMER_DIVISOR,
330 ((Uint64)TIMER_BASE*1000/TIMER_DIVISOR)%1000
334 // Get the count setting for APIC timer
335 Log("Determining APIC Count");
336 __asm__ __volatile__ ("sti");
337 while( giMP_TimerCount == 0 ) __asm__ __volatile__ ("hlt");
338 __asm__ __volatile__ ("cli");
339 Log("APIC Count %i", giMP_TimerCount);
341 Uint64 freq = giMP_TimerCount;
343 freq /= TIMER_DIVISOR;
344 if( (freq /= 1000) < 2*1000)
345 Log("Bus Frequency %i KHz", freq);
346 else if( (freq /= 1000) < 2*1000)
347 Log("Bus Frequency %i MHz", freq);
348 else if( (freq /= 1000) < 2*1000)
349 Log("Bus Frequency %i GHz", freq);
351 Log("Bus Frequency %i THz", freq);
354 // Initialise Normal TSS(s)
355 for(pos=0;pos<giNumCPUs;pos++)
360 gTSSs[pos].SS0 = 0x10;
361 gTSSs[pos].ESP0 = 0; // Set properly by scheduler
362 gGDT[6+pos].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
363 gGDT[6+pos].BaseMid = ((Uint)(&gTSSs[pos]) >> 16) & 0xFFFF;
364 gGDT[6+pos].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
369 // Load the BSP's TSS
370 __asm__ __volatile__ ("ltr %%ax"::"a"(0x30));
371 // Set Current Thread and CPU Number in DR0 and DR1
372 __asm__ __volatile__ ("mov %0, %%db0"::"r"(&gThreadZero));
373 __asm__ __volatile__ ("mov %0, %%db1"::"r"(0));
375 gaCPUs[0].Current = &gThreadZero;
376 gThreadZero.CurCPU = 0;
378 gProcessZero.MemState.CR3 = (Uint)gaInitPageDir - KERNEL_BASE;
380 // Create Per-Process Data Block
381 if( !MM_Allocate(MM_PPD_CFG) )
383 Panic("OOM - No space for initial Per-Process Config");
386 // Initialise SSE support
387 Proc_InitialiseSSE();
397 void MP_StartAP(int CPU)
399 Log_Log("Proc", "Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID);
401 // Set location of AP startup code and mark for a warm restart
402 *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APWait - (KERNEL_BASE|0xFFFF0);
403 *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
404 outb(0x70, 0x0F); outb(0x71, 0x0A); // Set warm reset flag
405 MP_SendIPI(gaCPUs[CPU].APICID, 0, 5); // Init IPI
408 inb(0x80); inb(0x80); inb(0x80); inb(0x80);
410 // TODO: Use a better address, preferably registered with the MM
411 // - MM_AllocDMA mabye?
413 *(Uint8*)(KERNEL_BASE|0x11000) = 0xEA; // Far JMP
414 *(Uint16*)(KERNEL_BASE|0x11001) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0); // IP
415 *(Uint16*)(KERNEL_BASE|0x11003) = 0xFFFF; // CS
416 // Send a Startup-IPI to make the CPU execute at 0x11000 (which we
418 MP_SendIPI(gaCPUs[CPU].APICID, 0x11, 6); // StartupIPI
423 void MP_SendIPIVector(int CPU, Uint8 Vector)
425 MP_SendIPI(gaCPUs[CPU].APICID, Vector, 0);
429 * \brief Send an Inter-Processor Interrupt
430 * \param APICID Processor's Local APIC ID
431 * \param Vector Argument of some kind
432 * \param DeliveryMode Type of signal
433 * \note 3A 10.5 "APIC/Handling Local Interrupts"
435 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
440 val = (Uint)APICID << 24;
441 // Log("%p = 0x%08x", &gpMP_LocalAPIC->ICR[1], val);
442 gpMP_LocalAPIC->ICR[1].Val = val;
444 val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF);
445 // Log("%p = 0x%08x", &gpMP_LocalAPIC->ICR[0], val);
446 gpMP_LocalAPIC->ICR[0].Val = val;
450 void Proc_IdleThread(void *Ptr)
452 tCPU *cpu = &gaCPUs[GetCPUNum()];
453 cpu->Current->ThreadName = strdup("Idle Thread");
454 Threads_SetPriority( cpu->Current, -1 ); // Never called randomly
455 cpu->Current->Quantum = 1; // 1 slice quantum
457 __asm__ __volatile__ ("sti"); // Make sure interrupts are enabled
458 __asm__ __volatile__ ("hlt"); // Make sure interrupts are enabled
464 * \fn void Proc_Start(void)
465 * \brief Start process scheduler
467 void Proc_Start(void)
476 for( i = 0; i < giNumCPUs; i ++ )
478 if(i) gaCPUs[i].Current = NULL;
481 tid = Proc_NewKThread(Proc_IdleThread, &gaCPUs[i]);
484 if( i != giProc_BootProcessorID ) {
489 // BSP still should run the current task
490 gaCPUs[0].Current = &gThreadZero;
492 // Start interrupts and wait for APs to come up
493 Log_Debug("Proc", "Waiting for APs to come up");
494 __asm__ __volatile__ ("sti");
495 while( giNumInitingCPUs ) __asm__ __volatile__ ("hlt");
498 tid = Proc_NewKThread(Proc_IdleThread, &gaCPUs[0]);
499 // gaCPUs[0].IdleThread = Threads_GetThread(tid);
502 gaCPUs[0].Current = &gThreadZero;
504 // Start Interrupts (and hence scheduler)
505 __asm__ __volatile__("sti");
507 MM_FinishVirtualInit();
511 * \fn tThread *Proc_GetCurThread(void)
512 * \brief Gets the current thread
514 tThread *Proc_GetCurThread(void)
517 return gaCPUs[ GetCPUNum() ].Current;
519 return gaCPUs[ 0 ].Current;
524 * \fn void Proc_ChangeStack(void)
525 * \brief Swaps the current stack for a new one (in the proper stack reigon)
527 void Proc_ChangeStack(void)
531 Uint curBase, newBase;
533 __asm__ __volatile__ ("mov %%esp, %0":"=r"(esp));
534 __asm__ __volatile__ ("mov %%ebp, %0":"=r"(ebp));
539 newBase = MM_NewKStack();
542 Panic("What the?? Unable to allocate space for initial kernel stack");
546 curBase = (Uint)&Kernel_Stack_Top;
548 LOG("curBase = 0x%x, newBase = 0x%x", curBase, newBase);
550 // Get ESP as a used size
552 LOG("memcpy( %p, %p, 0x%x )", (void*)(newBase - esp), (void*)(curBase - esp), esp );
554 memcpy( (void*)(newBase - esp), (void*)(curBase - esp), esp );
555 // Get ESP as an offset in the new stack
558 ebp = newBase - (curBase - ebp);
560 // Repair EBPs & Stack Addresses
561 // Catches arguments also, but may trash stack-address-like values
562 for(tmpEbp = esp; tmpEbp < newBase; tmpEbp += 4)
564 if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < curBase)
565 *(Uint*)tmpEbp += newBase - curBase;
568 Proc_GetCurThread()->KernelStack = newBase;
570 __asm__ __volatile__ ("mov %0, %%esp"::"r"(esp));
571 __asm__ __volatile__ ("mov %0, %%ebp"::"r"(ebp));
574 void Proc_ClearProcess(tProcess *Process)
576 MM_ClearSpace(Process->MemState.CR3);
579 void Proc_ClearThread(tThread *Thread)
581 if(Thread->SavedState.SSE) {
582 free(Thread->SavedState.SSE);
583 Thread->SavedState.SSE = NULL;
587 tTID Proc_NewKThread(void (*Fcn)(void*), void *Data)
590 tThread *newThread, *cur;
592 cur = Proc_GetCurThread();
593 newThread = Threads_CloneTCB(0);
594 if(!newThread) return -1;
597 newThread->KernelStack = MM_NewKStack();
599 if(newThread->KernelStack == 0) {
604 esp = newThread->KernelStack;
605 *(Uint*)(esp-=4) = (Uint)Data; // Data (shadowed)
606 *(Uint*)(esp-=4) = 1; // Number of params
607 *(Uint*)(esp-=4) = (Uint)Fcn; // Function to call
608 *(Uint*)(esp-=4) = (Uint)newThread; // Thread ID
610 newThread->SavedState.ESP = esp;
611 newThread->SavedState.EIP = (Uint)&NewTaskHeader;
612 newThread->SavedState.SSE = NULL;
613 // Log("New (KThread) %p, esp = %p", newThread->SavedState.EIP, newThread->SavedState.ESP);
616 Threads_AddActive(newThread);
618 return newThread->TID;
622 * \fn int Proc_Clone(Uint *Err, Uint Flags)
623 * \brief Clone the current process
625 tPID Proc_Clone(Uint Flags)
628 tThread *cur = Proc_GetCurThread();
632 if( !(Flags & CLONE_VM) ) {
633 Log_Error("Proc", "Proc_Clone: Don't leave CLONE_VM unset, use Proc_NewKThread instead");
638 newThread = Threads_CloneTCB(Flags);
639 if(!newThread) return -1;
641 newThread->KernelStack = cur->KernelStack;
644 eip = Proc_CloneInt(&newThread->SavedState.ESP, &newThread->Process->MemState.CR3, Flags & CLONE_NOUSER);
648 newThread->SavedState.EIP = eip;
649 newThread->SavedState.SSE = NULL;
650 newThread->SavedState.bSSEModified = 0;
653 if( newThread->Process->MemState.CR3 == 0 ) {
654 Log_Error("Proc", "Proc_Clone: MM_Clone failed");
655 Threads_Delete(newThread);
659 // Add the new thread to the run queue
660 Threads_AddActive(newThread);
661 return newThread->TID;
665 * \fn int Proc_SpawnWorker(void)
666 * \brief Spawns a new worker thread
668 int Proc_SpawnWorker(void (*Fcn)(void*), void *Data)
671 Uint stack_contents[4];
674 new = Threads_CloneThreadZero();
676 Warning("Proc_SpawnWorker - Out of heap space!\n");
680 // Create the stack contents
681 stack_contents[3] = (Uint)Data;
682 stack_contents[2] = 1;
683 stack_contents[1] = (Uint)Fcn;
684 stack_contents[0] = (Uint)new;
686 // Create a new worker stack (in PID0's address space)
687 new->KernelStack = MM_NewWorkerStack(stack_contents, sizeof(stack_contents));
689 // Save core machine state
690 new->SavedState.ESP = new->KernelStack - sizeof(stack_contents);
691 new->SavedState.EIP = (Uint)NewTaskHeader;
692 new->SavedState.SSE = NULL;
693 new->SavedState.bSSEModified = 0;
696 new->Status = THREAD_STAT_PREINIT;
697 Threads_AddActive( new );
703 * \fn Uint Proc_MakeUserStack(void)
704 * \brief Creates a new user stack
706 Uint Proc_MakeUserStack(void)
709 Uint base = USER_STACK_TOP - USER_STACK_SZ;
711 // Check Prospective Space
712 for( i = USER_STACK_SZ >> 12; i--; )
713 if( MM_GetPhysAddr( base + (i<<12) ) != 0 )
716 if(i != -1) return 0;
718 // Allocate Stack - Allocate incrementally to clean up MM_Dump output
719 for( i = 0; i < USER_STACK_SZ/0x1000; i++ )
721 if( !MM_Allocate( base + (i<<12) ) )
723 Warning("OOM: Proc_MakeUserStack");
728 return base + USER_STACK_SZ;
731 void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, const char **ArgV, int DataSize)
735 const char **envp = NULL;
738 // Copy data to the user stack and free original buffer
739 stack = (void*)Proc_MakeUserStack();
740 stack -= (DataSize+sizeof(*stack)-1)/sizeof(*stack);
741 memcpy( stack, ArgV, DataSize );
744 // Adjust Arguments and environment
747 Uint delta = (Uint)stack - (Uint)ArgV;
748 ArgV = (const char**)stack;
749 for( i = 0; ArgV[i]; i++ ) ArgV[i] += delta;
751 for( i = 0; envp[i]; i++ ) envp[i] += delta;
754 // User Mode Segments
755 ss = 0x23; cs = 0x1B;
758 *--stack = (Uint)envp;
759 *--stack = (Uint)ArgV;
760 *--stack = (Uint)ArgC;
763 Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
766 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
768 Uint *stack = (void*)Stack;
769 *--stack = SS; //Stack Segment
770 *--stack = Stack; //Stack Pointer
771 *--stack = Flags; //EFLAGS (Resvd (0x2) and IF (0x20))
772 *--stack = CS; //Code Segment
775 *--stack = 0xAAAAAAAA; // eax
776 *--stack = 0xCCCCCCCC; // ecx
777 *--stack = 0xDDDDDDDD; // edx
778 *--stack = 0xBBBBBBBB; // ebx
779 *--stack = 0xD1D1D1D1; // edi
780 *--stack = 0x54545454; // esp - NOT POPED
781 *--stack = 0x51515151; // esi
782 *--stack = 0xB4B4B4B4; // ebp
789 __asm__ __volatile__ (
790 "mov %%eax,%%esp;\n\t" // Set stack pointer
796 "iret;\n\t" : : "a" (stack));
801 * \fn int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
802 * \brief Demotes a process to a lower permission level
803 * \param Err Pointer to user's errno
804 * \param Dest New Permission Level
805 * \param Regs Pointer to user's register structure
807 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
809 int cpl = Regs->cs & 3;
811 if(Dest > 3 || Dest < 0) {
822 // Change the Segment Registers
823 Regs->cs = (((Dest+1)<<4) | Dest) - 8;
824 Regs->ss = ((Dest+1)<<4) | Dest;
825 // Check if the GP Segs are GDT, then change them
826 if(!(Regs->ds & 4)) Regs->ds = ((Dest+1)<<4) | Dest;
827 if(!(Regs->es & 4)) Regs->es = ((Dest+1)<<4) | Dest;
828 if(!(Regs->fs & 4)) Regs->fs = ((Dest+1)<<4) | Dest;
829 if(!(Regs->gs & 4)) Regs->gs = ((Dest+1)<<4) | Dest;
835 * \brief Calls a signal handler in user mode
836 * \note Used for signals
838 void Proc_CallFaultHandler(tThread *Thread)
840 // Rewinds the stack and calls the user function
842 Proc_ReturnToUser( Thread->FaultHandler, Thread->CurFaultNum, Thread->KernelStack );
846 void Proc_DumpThreadCPUState(tThread *Thread)
848 if( Thread->CurCPU > -1 )
850 int maxBacktraceDistance = 6;
854 if( Thread->CurCPU != GetCPUNum() ) {
855 Log(" Currently running");
859 // Backtrace to find the IRQ entrypoint
860 // - This will usually only be called by an IRQ, so this should
862 __asm__ __volatile__ ("mov %%ebp, %0" : "=r" (stack));
863 while( maxBacktraceDistance -- )
868 if( stack[1] == (tVAddr)&IRQCommon_handled ) {
869 regs = (void*)stack[2];
873 stack = (void*)stack[0];
877 Log(" Unable to find IRQ Entry");
881 Log(" at %04x:%08x", regs->cs, regs->eip);
885 tVAddr diffFromScheduler = Thread->SavedState.EIP - (tVAddr)SwitchTasks;
886 tVAddr diffFromClone = Thread->SavedState.EIP - (tVAddr)Proc_CloneInt;
887 tVAddr diffFromSpawn = Thread->SavedState.EIP - (tVAddr)NewTaskHeader;
889 if( diffFromClone > 0 && diffFromClone < 40 ) // When I last checked, .newTask was at .+27
891 Log(" Creating process");
895 if( diffFromSpawn == 0 )
897 Log(" Creating thread");
901 if( diffFromScheduler > 0 && diffFromScheduler < 128 ) // When I last checked, GetEIP was at .+0x30
904 Log(" At %04x:%08x", Thread->SavedState.UserCS, Thread->SavedState.UserEIP);
908 Log(" Just created (unknown %p)", Thread->SavedState.EIP);
911 void Proc_Reschedule(void)
913 tThread *nextthread, *curthread;
914 int cpu = GetCPUNum();
916 // TODO: Wait for the lock?
917 if(IS_LOCKED(&glThreadListLock)) return;
919 curthread = Proc_GetCurThread();
921 nextthread = Threads_GetNextToRun(cpu, curthread);
923 if(!nextthread || nextthread == curthread)
926 #if DEBUG_TRACE_SWITCH
927 // HACK: Ignores switches to the idle threads
928 if( nextthread->TID == 0 || nextthread->TID > giNumCPUs )
930 LogF("\nSwitching CPU %i to %p (%i %s) - CR3 = 0x%x, EIP = %p, ESP = %p\n",
932 nextthread, nextthread->TID, nextthread->ThreadName,
933 nextthread->Process->MemState.CR3,
934 nextthread->SavedState.EIP,
935 nextthread->SavedState.ESP
937 LogF("OldCR3 = %P\n", curthread->Process->MemState.CR3);
942 gaCPUs[cpu].Current = nextthread;
943 gaCPUs[cpu].LastTimerThread = NULL;
944 gTSSs[cpu].ESP0 = nextthread->KernelStack-4;
945 __asm__ __volatile__("mov %0, %%db0\n\t" : : "r"(nextthread) );
947 // Save FPU/MMX/XMM/SSE state
948 if( curthread && curthread->SavedState.SSE )
950 Proc_SaveSSE( ((Uint)curthread->SavedState.SSE + 0xF) & ~0xF );
951 curthread->SavedState.bSSEModified = 0;
958 nextthread->SavedState.ESP, &curthread->SavedState.ESP,
959 nextthread->SavedState.EIP, &curthread->SavedState.EIP,
960 nextthread->Process->MemState.CR3
966 nextthread->SavedState.ESP, 0,
967 nextthread->SavedState.EIP, 0,
968 nextthread->Process->MemState.CR3
976 * \fn void Proc_Scheduler(int CPU)
977 * \brief Swap current thread and clears dead threads
979 void Proc_Scheduler(int CPU)
983 gpMP_LocalAPIC->EOI.Val = 0;
987 __asm__ __volatile__ ("sti");
989 // Call the timer update code
992 // If two ticks happen within the same task, and it's not an idle task, swap
993 if( gaCPUs[CPU].Current->TID > giNumCPUs && gaCPUs[CPU].Current == gaCPUs[CPU].LastTimerThread )
998 gaCPUs[CPU].LastTimerThread = gaCPUs[CPU].Current;
1002 EXPORT(Proc_SpawnWorker);