2 * AcessOS Microkernel Version
18 #define DEBUG_TRACE_SWITCH 0
19 #define DEBUG_DISABLE_DOUBLEFAULT 1
20 #define DEBUG_VERY_SLOW_PERIOD 0
21 #define DEBUG_NOPREEMPT 1
25 #define TIMER_BASE 1193182
26 #if DEBUG_VERY_SLOW_PERIOD
27 # define TIMER_DIVISOR 1193 //~10Hz switch, with 10 quantum = 1s per thread
29 # define TIMER_DIVISOR 11932 //~100Hz
36 Uint8 State; // 0: Unavaliable, 1: Idle, 2: Active
39 tThread *LastTimerThread; // Used to do preeemption
45 extern void APWait(void); // 16-bit AP pause code
46 extern void APStartup(void); // 16-bit AP startup code
47 extern Uint GetEIP(void); // start.asm
48 extern Uint GetEIP_Sched(void); // proc.asm
49 extern void NewTaskHeader(tThread *Thread, void *Fcn, int nArgs, ...); // Actually takes cdecl args
50 extern Uint Proc_CloneInt(Uint *ESP, Uint32 *CR3, int bNoUserClone);
51 extern Uint32 gaInitPageDir[1024]; // start.asm
52 extern char Kernel_Stack_Top[];
55 extern tThread gThreadZero;
56 extern tProcess gProcessZero;
57 extern void Isr8(void); // Double Fault
58 extern void Proc_ReturnToUser(tVAddr Handler, Uint Argument, tVAddr KernelStack);
59 extern char scheduler_return[]; // Return address in SchedulerBase
60 extern char IRQCommon[]; // Common IRQ handler code
61 extern char IRQCommon_handled[]; // IRQCommon call return location
62 extern char GetEIP_Sched_ret[]; // GetEIP call return location
63 extern void SwitchTasks(Uint NewSP, Uint *OldSP, Uint NewIP, Uint *OldIO, Uint CR3);
64 extern void Proc_InitialiseSSE(void);
65 extern void Proc_SaveSSE(Uint DestPtr);
66 extern void Proc_DisableSSE(void);
69 //void ArchThreads_Init(void);
71 void MP_StartAP(int CPU);
72 void MP_SendIPIVector(int CPU, Uint8 Vector);
73 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
75 void Proc_IdleThread(void *Ptr);
76 //void Proc_Start(void);
77 //tThread *Proc_GetCurThread(void);
78 void Proc_ChangeStack(void);
79 // int Proc_NewKThread(void (*Fcn)(void*), void *Data);
80 // int Proc_Clone(Uint *Err, Uint Flags);
81 Uint Proc_MakeUserStack(void);
82 //void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize);
83 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP) NORETURN;
84 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs);
85 //void Proc_CallFaultHandler(tThread *Thread);
86 //void Proc_DumpThreadCPUState(tThread *Thread);
87 void Proc_Scheduler(int CPU);
90 // --- Multiprocessing ---
92 volatile int giNumInitingCPUs = 0;
93 tMPInfo *gMPFloatPtr = NULL;
94 volatile Uint32 giMP_TimerCount; // Start Count for Local APIC Timer
95 tAPIC *gpMP_LocalAPIC = NULL;
96 Uint8 gaAPIC_to_CPU[256] = {0};
97 int giProc_BootProcessorID = 0;
98 tTSS gaTSSs[MAX_CPUS]; // TSS Array
100 tCPU gaCPUs[MAX_CPUS] = {
101 {.Current = &gThreadZero}
103 tTSS *gTSSs = NULL; // Pointer to TSS array
105 // --- Error Recovery ---
106 char gaDoubleFaultStack[1024] __attribute__ ((section(".padata")));
107 tTSS gDoubleFault_TSS = {
108 .ESP0 = (Uint)&gaDoubleFaultStack[1024],
110 .CR3 = (Uint)gaInitPageDir - KERNEL_BASE,
112 .ESP = (Uint)&gaDoubleFaultStack[1024],
113 .CS = 0x08, .SS = 0x10,
114 .DS = 0x10, .ES = 0x10,
115 .FS = 0x10, .GS = 0x10,
120 * \fn void ArchThreads_Init(void)
121 * \brief Starts the process scheduler
123 void ArchThreads_Init(void)
130 // Mark BSP as active
133 // -- Initialise Multiprocessing
134 // Find MP Floating Table
135 // - EBDA/Last 1Kib (640KiB)
136 for(pos = KERNEL_BASE|0x9F000; pos < (KERNEL_BASE|0xA0000); 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;
144 // - Last KiB (512KiB base mem)
146 for(pos = KERNEL_BASE|0x7F000; pos < (KERNEL_BASE|0x80000); pos += 16) {
147 if( *(Uint*)(pos) == MPPTR_IDENT ) {
148 Log("Possible %p", pos);
149 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
150 gMPFloatPtr = (void*)pos;
157 for(pos = KERNEL_BASE|0xE0000; pos < (KERNEL_BASE|0x100000); pos += 16) {
158 if( *(Uint*)(pos) == MPPTR_IDENT ) {
159 Log("Possible %p", pos);
160 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
161 gMPFloatPtr = (void*)pos;
167 // If the MP Table Exists, parse it
173 Log("gMPFloatPtr = %p", gMPFloatPtr);
174 Log("*gMPFloatPtr = {");
175 Log("\t.Sig = 0x%08x", gMPFloatPtr->Sig);
176 Log("\t.MPConfig = 0x%08x", gMPFloatPtr->MPConfig);
177 Log("\t.Length = 0x%02x", gMPFloatPtr->Length);
178 Log("\t.Version = 0x%02x", gMPFloatPtr->Version);
179 Log("\t.Checksum = 0x%02x", gMPFloatPtr->Checksum);
180 Log("\t.Features = [0x%02x,0x%02x,0x%02x,0x%02x,0x%02x]",
181 gMPFloatPtr->Features[0], gMPFloatPtr->Features[1],
182 gMPFloatPtr->Features[2], gMPFloatPtr->Features[3],
183 gMPFloatPtr->Features[4]
188 mptable = (void*)( KERNEL_BASE|gMPFloatPtr->MPConfig );
190 Log("mptable = %p", mptable);
192 Log("\t.Sig = 0x%08x", mptable->Sig);
193 Log("\t.BaseTableLength = 0x%04x", mptable->BaseTableLength);
194 Log("\t.SpecRev = 0x%02x", mptable->SpecRev);
195 Log("\t.Checksum = 0x%02x", mptable->Checksum);
196 Log("\t.OEMID = '%8c'", mptable->OemID);
197 Log("\t.ProductID = '%8c'", mptable->ProductID);
198 Log("\t.OEMTablePtr = %p'", mptable->OEMTablePtr);
199 Log("\t.OEMTableSize = 0x%04x", mptable->OEMTableSize);
200 Log("\t.EntryCount = 0x%04x", mptable->EntryCount);
201 Log("\t.LocalAPICMemMap = 0x%08x", mptable->LocalAPICMemMap);
202 Log("\t.ExtendedTableLen = 0x%04x", mptable->ExtendedTableLen);
203 Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum);
207 gpMP_LocalAPIC = (void*)MM_MapHWPages(mptable->LocalAPICMemMap, 1);
209 ents = mptable->Entries;
212 for( i = 0; i < mptable->EntryCount; i ++ )
220 Log("%i: Processor", i);
221 Log("\t.APICID = %i", ents->Proc.APICID);
222 Log("\t.APICVer = 0x%02x", ents->Proc.APICVer);
223 Log("\t.CPUFlags = 0x%02x", ents->Proc.CPUFlags);
224 Log("\t.CPUSignature = 0x%08x", ents->Proc.CPUSignature);
225 Log("\t.FeatureFlags = 0x%08x", ents->Proc.FeatureFlags);
228 if( !(ents->Proc.CPUFlags & 1) ) {
233 // Check if there is too many processors
234 if(giNumCPUs >= MAX_CPUS) {
235 giNumCPUs ++; // If `giNumCPUs` > MAX_CPUS later, it will be clipped
239 // Initialise CPU Info
240 gaAPIC_to_CPU[ents->Proc.APICID] = giNumCPUs;
241 gaCPUs[giNumCPUs].APICID = ents->Proc.APICID;
242 gaCPUs[giNumCPUs].State = 0;
246 if( ents->Proc.CPUFlags & 2 ) {
247 giProc_BootProcessorID = giNumCPUs-1;
252 #if DUMP_MP_TABLE >= 2
256 Log("\t.ID = %i", ents->Bus.ID);
257 Log("\t.TypeString = '%6C'", ents->Bus.TypeString);
261 Log("%i: I/O APIC", i);
262 Log("\t.ID = %i", ents->IOAPIC.ID);
263 Log("\t.Version = 0x%02x", ents->IOAPIC.Version);
264 Log("\t.Flags = 0x%02x", ents->IOAPIC.Flags);
265 Log("\t.Addr = 0x%08x", ents->IOAPIC.Addr);
267 case 3: // I/O Interrupt Assignment
269 Log("%i: I/O Interrupt Assignment", i);
270 Log("\t.IntType = %i", ents->IOInt.IntType);
271 Log("\t.Flags = 0x%04x", ents->IOInt.Flags);
272 Log("\t.SourceBusID = 0x%02x", ents->IOInt.SourceBusID);
273 Log("\t.SourceBusIRQ = 0x%02x", ents->IOInt.SourceBusIRQ);
274 Log("\t.DestAPICID = 0x%02x", ents->IOInt.DestAPICID);
275 Log("\t.DestAPICIRQ = 0x%02x", ents->IOInt.DestAPICIRQ);
277 case 4: // Local Interrupt Assignment
279 Log("%i: Local Interrupt Assignment", i);
280 Log("\t.IntType = %i", ents->LocalInt.IntType);
281 Log("\t.Flags = 0x%04x", ents->LocalInt.Flags);
282 Log("\t.SourceBusID = 0x%02x", ents->LocalInt.SourceBusID);
283 Log("\t.SourceBusIRQ = 0x%02x", ents->LocalInt.SourceBusIRQ);
284 Log("\t.DestLocalAPICID = 0x%02x", ents->LocalInt.DestLocalAPICID);
285 Log("\t.DestLocalAPICIRQ = 0x%02x", ents->LocalInt.DestLocalAPICIRQ);
288 Log("%i: Unknown (%i)", i, ents->Type);
292 ents = (void*)( (Uint)ents + entSize );
295 if( giNumCPUs > MAX_CPUS ) {
296 Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS);
297 giNumCPUs = MAX_CPUS;
302 Log("No MP Table was found, assuming uniprocessor\n");
311 #if !DEBUG_DISABLE_DOUBLEFAULT
312 // Initialise Double Fault TSS
313 gGDT[5].BaseLow = (Uint)&gDoubleFault_TSS & 0xFFFF;
314 gGDT[5].BaseMid = (Uint)&gDoubleFault_TSS >> 16;
315 gGDT[5].BaseHi = (Uint)&gDoubleFault_TSS >> 24;
317 // Set double fault IDT to use the new TSS
318 gIDT[8].OffsetLo = 0;
320 gIDT[8].Flags = 0x8500;
321 gIDT[8].OffsetHi = 0;
324 // Set timer frequency
325 outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator
326 outb(0x40, TIMER_DIVISOR&0xFF); // Low Byte of Divisor
327 outb(0x40, (TIMER_DIVISOR>>8)&0xFF); // High Byte
329 Log_Debug("Proc", "PIT Frequency %i.%03i Hz",
330 TIMER_BASE/TIMER_DIVISOR,
331 ((Uint64)TIMER_BASE*1000/TIMER_DIVISOR)%1000
335 // Get the count setting for APIC timer
336 Log("Determining APIC Count");
337 __asm__ __volatile__ ("sti");
338 while( giMP_TimerCount == 0 ) __asm__ __volatile__ ("hlt");
339 __asm__ __volatile__ ("cli");
340 Log("APIC Count %i", giMP_TimerCount);
342 Uint64 freq = giMP_TimerCount;
344 freq /= TIMER_DIVISOR;
345 if( (freq /= 1000) < 2*1000)
346 Log("Bus Frequency %i KHz", freq);
347 else if( (freq /= 1000) < 2*1000)
348 Log("Bus Frequency %i MHz", freq);
349 else if( (freq /= 1000) < 2*1000)
350 Log("Bus Frequency %i GHz", freq);
352 Log("Bus Frequency %i THz", freq);
355 // Initialise Normal TSS(s)
356 for(pos=0;pos<giNumCPUs;pos++)
361 gTSSs[pos].SS0 = 0x10;
362 gTSSs[pos].ESP0 = 0; // Set properly by scheduler
363 gGDT[6+pos].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
364 gGDT[6+pos].BaseMid = ((Uint)(&gTSSs[pos]) >> 16) & 0xFFFF;
365 gGDT[6+pos].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
370 // Load the BSP's TSS
371 __asm__ __volatile__ ("ltr %%ax"::"a"(0x30));
372 // Set Current Thread and CPU Number in DR0 and DR1
373 __asm__ __volatile__ ("mov %0, %%db0"::"r"(&gThreadZero));
374 __asm__ __volatile__ ("mov %0, %%db1"::"r"(0));
376 gaCPUs[0].Current = &gThreadZero;
377 gThreadZero.CurCPU = 0;
379 gProcessZero.MemState.CR3 = (Uint)gaInitPageDir - KERNEL_BASE;
381 // Create Per-Process Data Block
382 if( !MM_Allocate(MM_PPD_CFG) )
384 Panic("OOM - No space for initial Per-Process Config");
387 // Initialise SSE support
388 Proc_InitialiseSSE();
398 void MP_StartAP(int CPU)
400 Log_Log("Proc", "Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID);
402 // Set location of AP startup code and mark for a warm restart
403 *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APWait - (KERNEL_BASE|0xFFFF0);
404 *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
405 outb(0x70, 0x0F); outb(0x71, 0x0A); // Set warm reset flag
406 MP_SendIPI(gaCPUs[CPU].APICID, 0, 5); // Init IPI
409 inb(0x80); inb(0x80); inb(0x80); inb(0x80);
411 // TODO: Use a better address, preferably registered with the MM
412 // - MM_AllocDMA mabye?
414 *(Uint8*)(KERNEL_BASE|0x11000) = 0xEA; // Far JMP
415 *(Uint16*)(KERNEL_BASE|0x11001) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0); // IP
416 *(Uint16*)(KERNEL_BASE|0x11003) = 0xFFFF; // CS
417 // Send a Startup-IPI to make the CPU execute at 0x11000 (which we
419 MP_SendIPI(gaCPUs[CPU].APICID, 0x11, 6); // StartupIPI
424 void MP_SendIPIVector(int CPU, Uint8 Vector)
426 MP_SendIPI(gaCPUs[CPU].APICID, Vector, 0);
430 * \brief Send an Inter-Processor Interrupt
431 * \param APICID Processor's Local APIC ID
432 * \param Vector Argument of some kind
433 * \param DeliveryMode Type of signal
434 * \note 3A 10.5 "APIC/Handling Local Interrupts"
436 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
441 val = (Uint)APICID << 24;
442 // Log("%p = 0x%08x", &gpMP_LocalAPIC->ICR[1], val);
443 gpMP_LocalAPIC->ICR[1].Val = val;
445 val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF);
446 // Log("%p = 0x%08x", &gpMP_LocalAPIC->ICR[0], val);
447 gpMP_LocalAPIC->ICR[0].Val = val;
451 void Proc_IdleThread(void *Ptr)
453 tCPU *cpu = &gaCPUs[GetCPUNum()];
454 cpu->Current->ThreadName = strdup("Idle Thread");
455 Threads_SetPriority( cpu->Current, -1 ); // Never called randomly
456 cpu->Current->Quantum = 1; // 1 slice quantum
458 __asm__ __volatile__ ("sti"); // Make sure interrupts are enabled
459 __asm__ __volatile__ ("hlt"); // Make sure interrupts are enabled
465 * \fn void Proc_Start(void)
466 * \brief Start process scheduler
468 void Proc_Start(void)
477 for( i = 0; i < giNumCPUs; i ++ )
479 if(i) gaCPUs[i].Current = NULL;
482 tid = Proc_NewKThread(Proc_IdleThread, &gaCPUs[i]);
485 if( i != giProc_BootProcessorID ) {
490 // BSP still should run the current task
491 gaCPUs[0].Current = &gThreadZero;
493 // Start interrupts and wait for APs to come up
494 Log_Debug("Proc", "Waiting for APs to come up");
495 __asm__ __volatile__ ("sti");
496 while( giNumInitingCPUs ) __asm__ __volatile__ ("hlt");
499 tid = Proc_NewKThread(Proc_IdleThread, &gaCPUs[0]);
500 // gaCPUs[0].IdleThread = Threads_GetThread(tid);
503 gaCPUs[0].Current = &gThreadZero;
505 // Start Interrupts (and hence scheduler)
506 __asm__ __volatile__("sti");
508 MM_FinishVirtualInit();
512 * \fn tThread *Proc_GetCurThread(void)
513 * \brief Gets the current thread
515 tThread *Proc_GetCurThread(void)
518 return gaCPUs[ GetCPUNum() ].Current;
520 return gaCPUs[ 0 ].Current;
525 * \fn void Proc_ChangeStack(void)
526 * \brief Swaps the current stack for a new one (in the proper stack reigon)
528 void Proc_ChangeStack(void)
532 Uint curBase, newBase;
534 __asm__ __volatile__ ("mov %%esp, %0":"=r"(esp));
535 __asm__ __volatile__ ("mov %%ebp, %0":"=r"(ebp));
540 newBase = MM_NewKStack();
543 Panic("What the?? Unable to allocate space for initial kernel stack");
547 curBase = (Uint)&Kernel_Stack_Top;
549 LOG("curBase = 0x%x, newBase = 0x%x", curBase, newBase);
551 // Get ESP as a used size
553 LOG("memcpy( %p, %p, 0x%x )", (void*)(newBase - esp), (void*)(curBase - esp), esp );
555 memcpy( (void*)(newBase - esp), (void*)(curBase - esp), esp );
556 // Get ESP as an offset in the new stack
559 ebp = newBase - (curBase - ebp);
561 // Repair EBPs & Stack Addresses
562 // Catches arguments also, but may trash stack-address-like values
563 for(tmpEbp = esp; tmpEbp < newBase; tmpEbp += 4)
565 if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < curBase)
566 *(Uint*)tmpEbp += newBase - curBase;
569 Proc_GetCurThread()->KernelStack = newBase;
571 __asm__ __volatile__ ("mov %0, %%esp"::"r"(esp));
572 __asm__ __volatile__ ("mov %0, %%ebp"::"r"(ebp));
575 void Proc_ClearProcess(tProcess *Process)
577 MM_ClearSpace(Process->MemState.CR3);
580 void Proc_ClearThread(tThread *Thread)
582 if(Thread->SavedState.SSE) {
583 free(Thread->SavedState.SSE);
584 Thread->SavedState.SSE = NULL;
588 tTID Proc_NewKThread(void (*Fcn)(void*), void *Data)
591 tThread *newThread, *cur;
593 cur = Proc_GetCurThread();
594 newThread = Threads_CloneTCB(0);
595 if(!newThread) return -1;
598 newThread->KernelStack = MM_NewKStack();
600 if(newThread->KernelStack == 0) {
605 esp = newThread->KernelStack;
606 *(Uint*)(esp-=4) = (Uint)Data; // Data (shadowed)
607 *(Uint*)(esp-=4) = 1; // Number of params
608 *(Uint*)(esp-=4) = (Uint)Fcn; // Function to call
609 *(Uint*)(esp-=4) = (Uint)newThread; // Thread ID
611 newThread->SavedState.ESP = esp;
612 newThread->SavedState.EIP = (Uint)&NewTaskHeader;
613 newThread->SavedState.SSE = NULL;
614 // Log("New (KThread) %p, esp = %p", newThread->SavedState.EIP, newThread->SavedState.ESP);
617 Threads_AddActive(newThread);
619 return newThread->TID;
623 * \fn int Proc_Clone(Uint *Err, Uint Flags)
624 * \brief Clone the current process
626 tPID Proc_Clone(Uint Flags)
629 tThread *cur = Proc_GetCurThread();
633 if( !(Flags & CLONE_VM) ) {
634 Log_Error("Proc", "Proc_Clone: Don't leave CLONE_VM unset, use Proc_NewKThread instead");
639 newThread = Threads_CloneTCB(Flags);
640 if(!newThread) return -1;
642 newThread->KernelStack = cur->KernelStack;
645 eip = Proc_CloneInt(&newThread->SavedState.ESP, &newThread->Process->MemState.CR3, Flags & CLONE_NOUSER);
649 newThread->SavedState.EIP = eip;
650 newThread->SavedState.SSE = NULL;
651 newThread->SavedState.bSSEModified = 0;
654 if( newThread->Process->MemState.CR3 == 0 ) {
655 Log_Error("Proc", "Proc_Clone: MM_Clone failed");
656 Threads_Delete(newThread);
660 // Add the new thread to the run queue
661 Threads_AddActive(newThread);
662 return newThread->TID;
666 * \fn int Proc_SpawnWorker(void)
667 * \brief Spawns a new worker thread
669 int Proc_SpawnWorker(void (*Fcn)(void*), void *Data)
672 Uint stack_contents[4];
675 new = Threads_CloneThreadZero();
677 Warning("Proc_SpawnWorker - Out of heap space!\n");
681 // Create the stack contents
682 stack_contents[3] = (Uint)Data;
683 stack_contents[2] = 1;
684 stack_contents[1] = (Uint)Fcn;
685 stack_contents[0] = (Uint)new;
687 // Create a new worker stack (in PID0's address space)
688 new->KernelStack = MM_NewWorkerStack(stack_contents, sizeof(stack_contents));
690 // Save core machine state
691 new->SavedState.ESP = new->KernelStack - sizeof(stack_contents);
692 new->SavedState.EIP = (Uint)NewTaskHeader;
693 new->SavedState.SSE = NULL;
694 new->SavedState.bSSEModified = 0;
697 new->Status = THREAD_STAT_PREINIT;
698 Threads_AddActive( new );
704 * \fn Uint Proc_MakeUserStack(void)
705 * \brief Creates a new user stack
707 Uint Proc_MakeUserStack(void)
710 Uint base = USER_STACK_TOP - USER_STACK_SZ;
712 // Check Prospective Space
713 for( i = USER_STACK_SZ >> 12; i--; )
714 if( MM_GetPhysAddr( base + (i<<12) ) != 0 )
717 if(i != -1) return 0;
719 // Allocate Stack - Allocate incrementally to clean up MM_Dump output
720 for( i = 0; i < USER_STACK_SZ/0x1000; i++ )
722 if( !MM_Allocate( base + (i<<12) ) )
724 Warning("OOM: Proc_MakeUserStack");
729 return base + USER_STACK_SZ;
732 void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, const char **ArgV, int DataSize)
736 const char **envp = NULL;
739 // Copy data to the user stack and free original buffer
740 stack = (void*)Proc_MakeUserStack();
741 stack -= (DataSize+sizeof(*stack)-1)/sizeof(*stack);
742 memcpy( stack, ArgV, DataSize );
745 // Adjust Arguments and environment
748 Uint delta = (Uint)stack - (Uint)ArgV;
749 ArgV = (const char**)stack;
750 for( i = 0; ArgV[i]; i++ ) ArgV[i] += delta;
752 for( i = 0; envp[i]; i++ ) envp[i] += delta;
755 // User Mode Segments
756 ss = 0x23; cs = 0x1B;
759 *--stack = (Uint)envp;
760 *--stack = (Uint)ArgV;
761 *--stack = (Uint)ArgC;
764 Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
767 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
769 Uint *stack = (void*)Stack;
770 *--stack = SS; //Stack Segment
771 *--stack = Stack; //Stack Pointer
772 *--stack = Flags; //EFLAGS (Resvd (0x2) and IF (0x20))
773 *--stack = CS; //Code Segment
776 *--stack = 0xAAAAAAAA; // eax
777 *--stack = 0xCCCCCCCC; // ecx
778 *--stack = 0xDDDDDDDD; // edx
779 *--stack = 0xBBBBBBBB; // ebx
780 *--stack = 0xD1D1D1D1; // edi
781 *--stack = 0x54545454; // esp - NOT POPED
782 *--stack = 0x51515151; // esi
783 *--stack = 0xB4B4B4B4; // ebp
790 __asm__ __volatile__ (
791 "mov %%eax,%%esp;\n\t" // Set stack pointer
797 "iret;\n\t" : : "a" (stack));
802 * \fn int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
803 * \brief Demotes a process to a lower permission level
804 * \param Err Pointer to user's errno
805 * \param Dest New Permission Level
806 * \param Regs Pointer to user's register structure
808 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
810 int cpl = Regs->cs & 3;
812 if(Dest > 3 || Dest < 0) {
823 // Change the Segment Registers
824 Regs->cs = (((Dest+1)<<4) | Dest) - 8;
825 Regs->ss = ((Dest+1)<<4) | Dest;
826 // Check if the GP Segs are GDT, then change them
827 if(!(Regs->ds & 4)) Regs->ds = ((Dest+1)<<4) | Dest;
828 if(!(Regs->es & 4)) Regs->es = ((Dest+1)<<4) | Dest;
829 if(!(Regs->fs & 4)) Regs->fs = ((Dest+1)<<4) | Dest;
830 if(!(Regs->gs & 4)) Regs->gs = ((Dest+1)<<4) | Dest;
836 * \brief Calls a signal handler in user mode
837 * \note Used for signals
839 void Proc_CallFaultHandler(tThread *Thread)
841 // Rewinds the stack and calls the user function
843 Proc_ReturnToUser( Thread->FaultHandler, Thread->CurFaultNum, Thread->KernelStack );
847 void Proc_DumpThreadCPUState(tThread *Thread)
849 if( Thread->CurCPU > -1 )
851 int maxBacktraceDistance = 6;
855 if( Thread->CurCPU != GetCPUNum() ) {
856 Log(" Currently running");
860 // Backtrace to find the IRQ entrypoint
861 // - This will usually only be called by an IRQ, so this should
863 __asm__ __volatile__ ("mov %%ebp, %0" : "=r" (stack));
864 while( maxBacktraceDistance -- )
869 if( stack[1] == (tVAddr)&IRQCommon_handled ) {
870 regs = (void*)stack[2];
874 stack = (void*)stack[0];
878 Log(" Unable to find IRQ Entry");
882 Log(" at %04x:%08x", regs->cs, regs->eip);
886 tVAddr diffFromScheduler = Thread->SavedState.EIP - (tVAddr)SwitchTasks;
887 tVAddr diffFromClone = Thread->SavedState.EIP - (tVAddr)Proc_CloneInt;
888 tVAddr diffFromSpawn = Thread->SavedState.EIP - (tVAddr)NewTaskHeader;
890 if( diffFromClone > 0 && diffFromClone < 40 ) // When I last checked, .newTask was at .+27
892 Log(" Creating process");
896 if( diffFromSpawn == 0 )
898 Log(" Creating thread");
902 if( diffFromScheduler > 0 && diffFromScheduler < 128 ) // When I last checked, GetEIP was at .+0x30
905 Log(" At %04x:%08x", Thread->SavedState.UserCS, Thread->SavedState.UserEIP);
909 Log(" Just created (unknown %p)", Thread->SavedState.EIP);
912 void Proc_Reschedule(void)
914 tThread *nextthread, *curthread;
915 int cpu = GetCPUNum();
917 // TODO: Wait for the lock?
918 if(IS_LOCKED(&glThreadListLock)) return;
920 curthread = Proc_GetCurThread();
922 nextthread = Threads_GetNextToRun(cpu, curthread);
924 if(!nextthread || nextthread == curthread)
927 #if DEBUG_TRACE_SWITCH
928 // HACK: Ignores switches to the idle threads
929 if( nextthread->TID == 0 || nextthread->TID > giNumCPUs )
931 LogF("\nSwitching CPU %i to %p (%i %s) - CR3 = 0x%x, EIP = %p, ESP = %p\n",
933 nextthread, nextthread->TID, nextthread->ThreadName,
934 nextthread->Process->MemState.CR3,
935 nextthread->SavedState.EIP,
936 nextthread->SavedState.ESP
938 LogF("OldCR3 = %P\n", curthread->Process->MemState.CR3);
943 gaCPUs[cpu].Current = nextthread;
944 gaCPUs[cpu].LastTimerThread = NULL;
945 gTSSs[cpu].ESP0 = nextthread->KernelStack-4;
946 __asm__ __volatile__("mov %0, %%db0\n\t" : : "r"(nextthread) );
948 // Save FPU/MMX/XMM/SSE state
949 if( curthread && curthread->SavedState.SSE )
951 Proc_SaveSSE( ((Uint)curthread->SavedState.SSE + 0xF) & ~0xF );
952 curthread->SavedState.bSSEModified = 0;
959 nextthread->SavedState.ESP, &curthread->SavedState.ESP,
960 nextthread->SavedState.EIP, &curthread->SavedState.EIP,
961 nextthread->Process->MemState.CR3
967 nextthread->SavedState.ESP, 0,
968 nextthread->SavedState.EIP, 0,
969 nextthread->Process->MemState.CR3
977 * \fn void Proc_Scheduler(int CPU)
978 * \brief Swap current thread and clears dead threads
980 void Proc_Scheduler(int CPU)
984 gpMP_LocalAPIC->EOI.Val = 0;
988 __asm__ __volatile__ ("sti");
990 // Call the timer update code
994 // If two ticks happen within the same task, and it's not an idle task, swap
995 if( gaCPUs[CPU].Current->TID > giNumCPUs && gaCPUs[CPU].Current == gaCPUs[CPU].LastTimerThread )
1000 gaCPUs[CPU].LastTimerThread = gaCPUs[CPU].Current;
1005 EXPORT(Proc_SpawnWorker);