2 * AcessOS Microkernel Version
16 #define DEBUG_TRACE_SWITCH 1
17 #define DEBUG_DISABLE_DOUBLEFAULT 1
20 #define SWITCH_MAGIC 0xFF5317C8 // FF SWITCH - There is no code in this area
22 #define TIMER_BASE 1193182
23 #define TIMER_DIVISOR 11932 //~100Hz
30 Uint8 State; // 0: Unavaliable, 1: Idle, 2: Active
40 extern void APWait(void); // 16-bit AP pause code
41 extern void APStartup(void); // 16-bit AP startup code
42 extern Uint GetEIP(void); // start.asm
43 extern Uint GetEIP_Sched(void); // proc.asm
44 extern int GetCPUNum(void); // start.asm
45 extern Uint32 gaInitPageDir[1024]; // start.asm
46 extern char Kernel_Stack_Top[];
47 extern tShortSpinlock glThreadListLock;
50 extern tThread gThreadZero;
51 extern void Isr8(void); // Double Fault
52 extern void Proc_ReturnToUser(tVAddr Handler, Uint Argument, tVAddr KernelStack);
53 extern void scheduler_return; // Return address in SchedulerBase
54 extern void IRQCommon; // Common IRQ handler code
55 extern void IRQCommon_handled; // IRQCommon call return location
56 extern void GetEIP_Sched_ret; // GetEIP call return location
59 void ArchThreads_Init(void);
61 void MP_StartAP(int CPU);
62 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
64 //void Proc_Start(void);
65 //tThread *Proc_GetCurThread(void);
66 void Proc_ChangeStack(void);
67 // int Proc_Clone(Uint *Err, Uint Flags);
68 Uint Proc_MakeUserStack(void);
69 void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize);
70 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP);
71 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs);
72 void Proc_CallFaultHandler(tThread *Thread);
73 void Proc_DumpThreadCPUState(tThread *Thread);
74 void Proc_Scheduler(int CPU);
77 // --- Multiprocessing ---
79 volatile int giNumInitingCPUs = 0;
80 tMPInfo *gMPFloatPtr = NULL;
81 volatile Uint32 giMP_TimerCount; // Start Count for Local APIC Timer
82 tAPIC *gpMP_LocalAPIC = NULL;
83 Uint8 gaAPIC_to_CPU[256] = {0};
84 tCPU gaCPUs[MAX_CPUS];
85 tTSS gaTSSs[MAX_CPUS]; // TSS Array
86 int giProc_BootProcessorID = 0;
88 tThread *gCurrentThread = NULL;
89 tThread *gpIdleThread = NULL;
92 Uint32 *gPML4s[4] = NULL;
94 tTSS *gTSSs = NULL; // Pointer to TSS array
96 // --- Error Recovery ---
97 char gaDoubleFaultStack[1024] __attribute__ ((section(".padata")));
98 tTSS gDoubleFault_TSS = {
99 .ESP0 = (Uint)&gaDoubleFaultStack[1024],
101 .CR3 = (Uint)gaInitPageDir - KERNEL_BASE,
103 .ESP = (Uint)&gaDoubleFaultStack[1024],
104 .CS = 0x08, .SS = 0x10,
105 .DS = 0x10, .ES = 0x10,
106 .FS = 0x10, .GS = 0x10,
111 * \fn void ArchThreads_Init(void)
112 * \brief Starts the process scheduler
114 void ArchThreads_Init(void)
121 // Mark BSP as active
124 // -- Initialise Multiprocessing
125 // Find MP Floating Table
126 // - EBDA/Last 1Kib (640KiB)
127 for(pos = KERNEL_BASE|0x9F000; pos < (KERNEL_BASE|0xA0000); pos += 16) {
128 if( *(Uint*)(pos) == MPPTR_IDENT ) {
129 Log("Possible %p", pos);
130 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
131 gMPFloatPtr = (void*)pos;
135 // - Last KiB (512KiB base mem)
137 for(pos = KERNEL_BASE|0x7F000; pos < (KERNEL_BASE|0x80000); pos += 16) {
138 if( *(Uint*)(pos) == MPPTR_IDENT ) {
139 Log("Possible %p", pos);
140 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
141 gMPFloatPtr = (void*)pos;
148 for(pos = KERNEL_BASE|0xE0000; pos < (KERNEL_BASE|0x100000); pos += 16) {
149 if( *(Uint*)(pos) == MPPTR_IDENT ) {
150 Log("Possible %p", pos);
151 if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
152 gMPFloatPtr = (void*)pos;
158 // If the MP Table Exists, parse it
163 Log("gMPFloatPtr = %p", gMPFloatPtr);
164 Log("*gMPFloatPtr = {");
165 Log("\t.Sig = 0x%08x", gMPFloatPtr->Sig);
166 Log("\t.MPConfig = 0x%08x", gMPFloatPtr->MPConfig);
167 Log("\t.Length = 0x%02x", gMPFloatPtr->Length);
168 Log("\t.Version = 0x%02x", gMPFloatPtr->Version);
169 Log("\t.Checksum = 0x%02x", gMPFloatPtr->Checksum);
170 Log("\t.Features = [0x%02x,0x%02x,0x%02x,0x%02x,0x%02x]",
171 gMPFloatPtr->Features[0], gMPFloatPtr->Features[1],
172 gMPFloatPtr->Features[2], gMPFloatPtr->Features[3],
173 gMPFloatPtr->Features[4]
177 mptable = (void*)( KERNEL_BASE|gMPFloatPtr->MPConfig );
178 Log("mptable = %p", mptable);
180 Log("\t.Sig = 0x%08x", mptable->Sig);
181 Log("\t.BaseTableLength = 0x%04x", mptable->BaseTableLength);
182 Log("\t.SpecRev = 0x%02x", mptable->SpecRev);
183 Log("\t.Checksum = 0x%02x", mptable->Checksum);
184 Log("\t.OEMID = '%8c'", mptable->OemID);
185 Log("\t.ProductID = '%8c'", mptable->ProductID);
186 Log("\t.OEMTablePtr = %p'", mptable->OEMTablePtr);
187 Log("\t.OEMTableSize = 0x%04x", mptable->OEMTableSize);
188 Log("\t.EntryCount = 0x%04x", mptable->EntryCount);
189 Log("\t.LocalAPICMemMap = 0x%08x", mptable->LocalAPICMemMap);
190 Log("\t.ExtendedTableLen = 0x%04x", mptable->ExtendedTableLen);
191 Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum);
194 gpMP_LocalAPIC = (void*)MM_MapHWPages(mptable->LocalAPICMemMap, 1);
196 ents = mptable->Entries;
199 for( i = 0; i < mptable->EntryCount; i ++ )
206 Log("%i: Processor", i);
207 Log("\t.APICID = %i", ents->Proc.APICID);
208 Log("\t.APICVer = 0x%02x", ents->Proc.APICVer);
209 Log("\t.CPUFlags = 0x%02x", ents->Proc.CPUFlags);
210 Log("\t.CPUSignature = 0x%08x", ents->Proc.CPUSignature);
211 Log("\t.FeatureFlags = 0x%08x", ents->Proc.FeatureFlags);
214 if( !(ents->Proc.CPUFlags & 1) ) {
219 // Check if there is too many processors
220 if(giNumCPUs >= MAX_CPUS) {
221 giNumCPUs ++; // If `giNumCPUs` > MAX_CPUS later, it will be clipped
225 // Initialise CPU Info
226 gaAPIC_to_CPU[ents->Proc.APICID] = giNumCPUs;
227 gaCPUs[giNumCPUs].APICID = ents->Proc.APICID;
228 gaCPUs[giNumCPUs].State = 0;
232 if( ents->Proc.CPUFlags & 2 ) {
233 giProc_BootProcessorID = giNumCPUs-1;
242 Log("\t.ID = %i", ents->Bus.ID);
243 Log("\t.TypeString = '%6C'", ents->Bus.TypeString);
247 Log("%i: I/O APIC", i);
248 Log("\t.ID = %i", ents->IOAPIC.ID);
249 Log("\t.Version = 0x%02x", ents->IOAPIC.Version);
250 Log("\t.Flags = 0x%02x", ents->IOAPIC.Flags);
251 Log("\t.Addr = 0x%08x", ents->IOAPIC.Addr);
253 case 3: // I/O Interrupt Assignment
255 Log("%i: I/O Interrupt Assignment", i);
256 Log("\t.IntType = %i", ents->IOInt.IntType);
257 Log("\t.Flags = 0x%04x", ents->IOInt.Flags);
258 Log("\t.SourceBusID = 0x%02x", ents->IOInt.SourceBusID);
259 Log("\t.SourceBusIRQ = 0x%02x", ents->IOInt.SourceBusIRQ);
260 Log("\t.DestAPICID = 0x%02x", ents->IOInt.DestAPICID);
261 Log("\t.DestAPICIRQ = 0x%02x", ents->IOInt.DestAPICIRQ);
263 case 4: // Local Interrupt Assignment
265 Log("%i: Local Interrupt Assignment", i);
266 Log("\t.IntType = %i", ents->LocalInt.IntType);
267 Log("\t.Flags = 0x%04x", ents->LocalInt.Flags);
268 Log("\t.SourceBusID = 0x%02x", ents->LocalInt.SourceBusID);
269 Log("\t.SourceBusIRQ = 0x%02x", ents->LocalInt.SourceBusIRQ);
270 Log("\t.DestLocalAPICID = 0x%02x", ents->LocalInt.DestLocalAPICID);
271 Log("\t.DestLocalAPICIRQ = 0x%02x", ents->LocalInt.DestLocalAPICIRQ);
274 Log("%i: Unknown (%i)", i, ents->Type);
278 ents = (void*)( (Uint)ents + entSize );
281 if( giNumCPUs > MAX_CPUS ) {
282 Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS);
283 giNumCPUs = MAX_CPUS;
288 Log("No MP Table was found, assuming uniprocessor\n");
297 #if !DEBUG_DISABLE_DOUBLEFAULT
298 // Initialise Double Fault TSS
299 gGDT[5].BaseLow = (Uint)&gDoubleFault_TSS & 0xFFFF;
300 gGDT[5].BaseMid = (Uint)&gDoubleFault_TSS >> 16;
301 gGDT[5].BaseHi = (Uint)&gDoubleFault_TSS >> 24;
303 // Set double fault IDT to use the new TSS
304 gIDT[8].OffsetLo = 0;
306 gIDT[8].Flags = 0x8500;
307 gIDT[8].OffsetHi = 0;
310 // Set timer frequency
311 outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator
312 outb(0x40, TIMER_DIVISOR&0xFF); // Low Byte of Divisor
313 outb(0x40, (TIMER_DIVISOR>>8)&0xFF); // High Byte
315 Log("Timer Frequency %i.%03i Hz",
316 TIMER_BASE/TIMER_DIVISOR,
317 ((Uint64)TIMER_BASE*1000/TIMER_DIVISOR)%1000
321 // Get the count setting for APIC timer
322 Log("Determining APIC Count");
323 __asm__ __volatile__ ("sti");
324 while( giMP_TimerCount == 0 ) __asm__ __volatile__ ("hlt");
325 __asm__ __volatile__ ("cli");
326 Log("APIC Count %i", giMP_TimerCount);
328 Uint64 freq = giMP_TimerCount;
329 freq /= TIMER_DIVISOR;
331 if( (freq /= 1000) < 2*1000)
332 Log("Bus Frequency %i KHz", freq);
333 else if( (freq /= 1000) < 2*1000)
334 Log("Bus Frequency %i MHz", freq);
335 else if( (freq /= 1000) < 2*1000)
336 Log("Bus Frequency %i GHz", freq);
338 Log("Bus Frequency %i THz", freq);
341 // Initialise Normal TSS(s)
342 for(pos=0;pos<giNumCPUs;pos++)
347 gTSSs[pos].SS0 = 0x10;
348 gTSSs[pos].ESP0 = 0; // Set properly by scheduler
349 gGDT[6+pos].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
350 gGDT[6+pos].BaseMid = ((Uint)(&gTSSs[pos]) >> 16) & 0xFFFF;
351 gGDT[6+pos].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
356 // Load the BSP's TSS
357 __asm__ __volatile__ ("ltr %%ax"::"a"(0x30));
358 // Set Current Thread and CPU Number in DR0 and DR1
359 __asm__ __volatile__ ("mov %0, %%db0"::"r"(&gThreadZero));
360 __asm__ __volatile__ ("mov %0, %%db1"::"r"(0));
363 gaCPUs[0].Current = &gThreadZero;
365 gCurrentThread = &gThreadZero;
367 gThreadZero.CurCPU = 0;
370 gThreadZero.MemState.PDP[0] = 0;
371 gThreadZero.MemState.PDP[1] = 0;
372 gThreadZero.MemState.PDP[2] = 0;
374 gThreadZero.MemState.CR3 = (Uint)gaInitPageDir - KERNEL_BASE;
377 // Create Per-Process Data Block
378 if( !MM_Allocate(MM_PPD_CFG) )
380 Panic("OOM - No space for initiali Per-Process Config");
388 void MP_StartAP(int CPU)
390 Log("Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID);
392 // Set location of AP startup code and mark for a warm restart
393 *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APWait - (KERNEL_BASE|0xFFFF0);
394 *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
395 outb(0x70, 0x0F); outb(0x71, 0x0A); // Set warm reset flag
396 MP_SendIPI(gaCPUs[CPU].APICID, 0, 5); // Init IPI
399 inb(0x80); inb(0x80); inb(0x80); inb(0x80);
401 // TODO: Use a better address, preferably registered with the MM
402 // - MM_AllocDMA mabye?
404 *(Uint8*)(KERNEL_BASE|0x11000) = 0xEA; // Far JMP
405 *(Uint16*)(KERNEL_BASE|0x11001) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0); // IP
406 *(Uint16*)(KERNEL_BASE|0x11003) = 0xFFFF; // CS
407 // Send a Startup-IPI to make the CPU execute at 0x11000 (which we
409 MP_SendIPI(gaCPUs[CPU].APICID, 0x11, 6); // StartupIPI
415 * \brief Send an Inter-Processor Interrupt
416 * \param APICID Processor's Local APIC ID
417 * \param Vector Argument of some kind
418 * \param DeliveryMode Type of signal?
420 void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
425 val = (Uint)APICID << 24;
426 Log("*%p = 0x%08x", &gpMP_LocalAPIC->ICR[1], val);
427 gpMP_LocalAPIC->ICR[1].Val = val;
429 val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF);
430 Log("*%p = 0x%08x", &gpMP_LocalAPIC->ICR[0], val);
431 gpMP_LocalAPIC->ICR[0].Val = val;
436 * \fn void Proc_Start(void)
437 * \brief Start process scheduler
439 void Proc_Start(void)
447 for( i = 0; i < giNumCPUs; i ++ )
450 if(i) gaCPUs[i].Current = NULL;
453 if( (tid = Proc_Clone(0, 0)) == 0)
455 for(;;) HALT(); // Just yeilds
457 gaCPUs[i].IdleThread = Threads_GetThread(tid);
458 gaCPUs[i].IdleThread->ThreadName = (char*)"Idle Thread";
459 Threads_SetPriority( gaCPUs[i].IdleThread, -1 ); // Never called randomly
460 gaCPUs[i].IdleThread->Quantum = 1; // 1 slice quantum
464 if( i != giProc_BootProcessorID ) {
469 // BSP still should run the current task
470 gaCPUs[0].Current = &gThreadZero;
472 // Start interrupts and wait for APs to come up
473 Log("Waiting for APs to come up\n");
474 __asm__ __volatile__ ("sti");
475 while( giNumInitingCPUs ) __asm__ __volatile__ ("hlt");
478 if(Proc_Clone(0, 0) == 0)
480 gpIdleThread = Proc_GetCurThread();
481 gpIdleThread->ThreadName = strdup("Idle Thread");
482 Threads_SetPriority( gpIdleThread, -1 ); // Never called randomly
483 gpIdleThread->Quantum = 1; // 1 slice quantum
484 for(;;) HALT(); // Just yeilds
488 gCurrentThread = &gThreadZero;
490 // Start Interrupts (and hence scheduler)
491 __asm__ __volatile__("sti");
493 MM_FinishVirtualInit();
497 * \fn tThread *Proc_GetCurThread(void)
498 * \brief Gets the current thread
500 tThread *Proc_GetCurThread(void)
503 return gaCPUs[ GetCPUNum() ].Current;
505 return gCurrentThread;
510 * \fn void Proc_ChangeStack(void)
511 * \brief Swaps the current stack for a new one (in the proper stack reigon)
513 void Proc_ChangeStack(void)
517 Uint curBase, newBase;
519 __asm__ __volatile__ ("mov %%esp, %0":"=r"(esp));
520 __asm__ __volatile__ ("mov %%ebp, %0":"=r"(ebp));
525 newBase = MM_NewKStack();
528 Panic("What the?? Unable to allocate space for initial kernel stack");
532 curBase = (Uint)&Kernel_Stack_Top;
534 LOG("curBase = 0x%x, newBase = 0x%x", curBase, newBase);
536 // Get ESP as a used size
538 LOG("memcpy( %p, %p, 0x%x )", (void*)(newBase - esp), (void*)(curBase - esp), esp );
540 memcpy( (void*)(newBase - esp), (void*)(curBase - esp), esp );
541 // Get ESP as an offset in the new stack
544 ebp = newBase - (curBase - ebp);
546 // Repair EBPs & Stack Addresses
547 // Catches arguments also, but may trash stack-address-like values
548 for(tmpEbp = esp; tmpEbp < newBase; tmpEbp += 4)
550 if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < curBase)
551 *(Uint*)tmpEbp += newBase - curBase;
554 Proc_GetCurThread()->KernelStack = newBase;
556 __asm__ __volatile__ ("mov %0, %%esp"::"r"(esp));
557 __asm__ __volatile__ ("mov %0, %%ebp"::"r"(ebp));
561 * \fn int Proc_Clone(Uint *Err, Uint Flags)
562 * \brief Clone the current process
564 int Proc_Clone(Uint *Err, Uint Flags)
567 tThread *cur = Proc_GetCurThread();
570 __asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
571 __asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
573 newThread = Threads_CloneTCB(Err, Flags);
574 if(!newThread) return -1;
576 // Initialise Memory Space (New Addr space or kernel stack)
577 if(Flags & CLONE_VM) {
578 newThread->MemState.CR3 = MM_Clone();
580 if(newThread->MemState.CR3 == 0) {
581 Threads_Kill(newThread, -2);
584 newThread->KernelStack = cur->KernelStack;
586 Uint tmpEbp, oldEsp = esp;
590 # warning "PAE Unimplemented"
592 newThread->MemState.CR3 = cur->MemState.CR3;
596 newThread->KernelStack = MM_NewKStack();
598 if(newThread->KernelStack == 0) {
599 Threads_Kill(newThread, -2);
603 // Get ESP as a used size
604 esp = cur->KernelStack - esp;
606 memcpy( (void*)(newThread->KernelStack - esp), (void*)(cur->KernelStack - esp), esp );
607 // Get ESP as an offset in the new stack
608 esp = newThread->KernelStack - esp;
610 ebp = newThread->KernelStack - (cur->KernelStack - ebp);
612 // Repair EBPs & Stack Addresses
613 // Catches arguments also, but may trash stack-address-like values
614 for(tmpEbp = esp; tmpEbp < newThread->KernelStack; tmpEbp += 4)
616 if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < cur->KernelStack)
617 *(Uint*)tmpEbp += newThread->KernelStack - cur->KernelStack;
621 // Save core machine state
622 newThread->SavedState.ESP = esp;
623 newThread->SavedState.EBP = ebp;
625 if(eip == SWITCH_MAGIC) {
626 //__asm__ __volatile__ ("mov %0, %%db0" : : "r" (newThread) );
630 gpMP_LocalAPIC->EOI.Val = 0;
633 outb(0x20, 0x20); // ACK Timer and return as child
634 __asm__ __volatile__ ("sti"); // Restart interrupts
639 newThread->SavedState.EIP = eip;
641 // Lock list and add to active
642 Threads_AddActive(newThread);
644 return newThread->TID;
648 * \fn int Proc_SpawnWorker(void)
649 * \brief Spawns a new worker thread
651 int Proc_SpawnWorker(void)
656 cur = Proc_GetCurThread();
659 new = Threads_CloneThreadZero();
661 Warning("Proc_SpawnWorker - Out of heap space!\n");
664 // Create a new worker stack (in PID0's address space)
665 // - The stack is relocated by this function
666 new->KernelStack = MM_NewWorkerStack();
668 // Get ESP and EBP based in the new stack
669 __asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
670 __asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
671 esp = new->KernelStack - (cur->KernelStack - esp);
672 ebp = new->KernelStack - (cur->KernelStack - ebp);
674 // Save core machine state
675 new->SavedState.ESP = esp;
676 new->SavedState.EBP = ebp;
678 if(eip == SWITCH_MAGIC) {
679 //__asm__ __volatile__ ("mov %0, %%db0" : : "r"(new));
683 gpMP_LocalAPIC->EOI.Val = 0;
686 outb(0x20, 0x20); // ACK Timer and return as child
687 __asm__ __volatile__ ("sti"); // Restart interrupts
692 new->SavedState.EIP = eip;
694 Threads_AddActive( new );
700 * \fn Uint Proc_MakeUserStack(void)
701 * \brief Creates a new user stack
703 Uint Proc_MakeUserStack(void)
706 Uint base = USER_STACK_TOP - USER_STACK_SZ;
708 // Check Prospective Space
709 for( i = USER_STACK_SZ >> 12; i--; )
710 if( MM_GetPhysAddr( base + (i<<12) ) != 0 )
713 if(i != -1) return 0;
715 // Allocate Stack - Allocate incrementally to clean up MM_Dump output
716 for( i = 0; i < USER_STACK_SZ/0x1000; i++ )
718 if( !MM_Allocate( base + (i<<12) ) )
720 Warning("OOM: Proc_MakeUserStack");
725 return base + USER_STACK_SZ;
729 * \fn void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
730 * \brief Starts a user task
732 void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
734 Uint *stack = (void*)Proc_MakeUserStack();
739 //Log("stack = %p", stack);
742 stack -= DataSize/sizeof(*stack);
743 memcpy( stack, ArgV, DataSize );
745 //Log("stack = %p", stack);
749 // Adjust Arguments and environment
750 delta = (Uint)stack - (Uint)ArgV;
751 ArgV = (char**)stack;
752 for( i = 0; ArgV[i]; i++ )
756 // Do we care about EnvP?
759 for( i = 0; EnvP[i]; i++ )
764 // User Mode Segments
765 ss = 0x23; cs = 0x1B;
768 *--stack = (Uint)EnvP;
769 *--stack = (Uint)ArgV;
770 *--stack = (Uint)ArgC;
773 *--stack = 0; // Return Address
775 Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
778 void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
780 Uint *stack = (void*)Stack;
781 *--stack = SS; //Stack Segment
782 *--stack = Stack; //Stack Pointer
783 *--stack = Flags; //EFLAGS (Resvd (0x2) and IF (0x20))
784 *--stack = CS; //Code Segment
787 *--stack = 0xAAAAAAAA; // eax
788 *--stack = 0xCCCCCCCC; // ecx
789 *--stack = 0xDDDDDDDD; // edx
790 *--stack = 0xBBBBBBBB; // ebx
791 *--stack = 0xD1D1D1D1; // edi
792 *--stack = 0x54545454; // esp - NOT POPED
793 *--stack = 0x51515151; // esi
794 *--stack = 0xB4B4B4B4; // ebp
801 __asm__ __volatile__ (
802 "mov %%eax,%%esp;\n\t" // Set stack pointer
808 "iret;\n\t" : : "a" (stack));
813 * \fn int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
814 * \brief Demotes a process to a lower permission level
815 * \param Err Pointer to user's errno
816 * \param Dest New Permission Level
817 * \param Regs Pointer to user's register structure
819 int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
821 int cpl = Regs->cs & 3;
823 if(Dest > 3 || Dest < 0) {
834 // Change the Segment Registers
835 Regs->cs = (((Dest+1)<<4) | Dest) - 8;
836 Regs->ss = ((Dest+1)<<4) | Dest;
837 // Check if the GP Segs are GDT, then change them
838 if(!(Regs->ds & 4)) Regs->ds = ((Dest+1)<<4) | Dest;
839 if(!(Regs->es & 4)) Regs->es = ((Dest+1)<<4) | Dest;
840 if(!(Regs->fs & 4)) Regs->fs = ((Dest+1)<<4) | Dest;
841 if(!(Regs->gs & 4)) Regs->gs = ((Dest+1)<<4) | Dest;
847 * \brief Calls a signal handler in user mode
848 * \note Used for signals
850 void Proc_CallFaultHandler(tThread *Thread)
852 // Rewinds the stack and calls the user function
854 Proc_ReturnToUser( Thread->FaultHandler, Thread->CurFaultNum, Thread->KernelStack );
858 void Proc_DumpThreadCPUState(tThread *Thread)
860 if( Thread->CurCPU > -1 )
862 int maxBacktraceDistance = 6;
866 if( Thread->CurCPU != GetCPUNum() ) {
867 Log(" Currently running");
871 // Backtrace to find the IRQ entrypoint
872 // - This will usually only be called by an IRQ, so this should
874 __asm__ __volatile__ ("mov %%ebp, %0" : "=r" (stack));
875 while( maxBacktraceDistance -- )
880 if( stack[1] == (tVAddr)&IRQCommon_handled ) {
881 regs = (void*)stack[2];
885 stack = (void*)stack[0];
889 Log(" Unable to find IRQ Entry");
893 Log(" at %04x:%08x", regs->cs, regs->eip);
898 tVAddr diffFromScheduler = Thread->SavedState.EIP - (tVAddr)Proc_Scheduler;
899 tVAddr diffFromClone = Thread->SavedState.EIP - (tVAddr)Proc_Clone;
900 tVAddr diffFromSpawn = Thread->SavedState.EIP - (tVAddr)Proc_SpawnWorker;
902 if( diffFromClone > 0 && diffFromClone < 512 ) // When I last checked, GetEIP was at .+0x183
904 Log(" Creating full thread");
908 if( diffFromSpawn > 0 && diffFromSpawn < 512 ) // When I last checked, GetEIP was at .+0x99
910 Log(" Creating worker thread");
914 if( diffFromScheduler > 0 && diffFromScheduler < 256 ) // When I last checked, GetEIP was at .+0x60
917 MM_ReadFromAddrSpace(Thread->MemState.CR3, Thread->SavedState.EBP, data, 12);
918 if( data[1] == (Uint32)&IRQCommon + 25 )
920 tRegs *regs = (void *) data[2];
921 Log(" oldebp = 0x%08x, ret = 0x%08x, regs = 0x%x",
922 data[0], data[1], data[2]
925 // [EBP+0x04] = Return Addr
926 // [EBP+0x08] = Arg 1 (CPU Number)
927 // [EBP+0x0C] = Arg 2 (Thread)
928 // [EBP+0x10] = GS (start of tRegs)
929 Log(" IRQ%i from %02x:%08x", regs->int_num regs->cs, regs->eip);
931 if( stack[1] == (Uint32)&scheduler_return )
935 Log(" At %04x:%08x", Thread->SavedState.UserCS, Thread->SavedState.UserEIP);
939 Log(" Just created (unknow %p)", Thread->SavedState.EIP);
943 * \fn void Proc_Scheduler(int CPU)
944 * \brief Swap current thread and clears dead threads
946 void Proc_Scheduler(int CPU)
951 // If the spinlock is set, let it complete
952 if(IS_LOCKED(&glThreadListLock)) return;
954 // Get current thread
956 thread = gaCPUs[CPU].Current;
958 thread = gCurrentThread;
963 // Bug may be caused by DR0 not being maintained somewhere, hence
964 // login is getting loaded with the idle state.
968 // Reduce remaining quantum and continue timeslice if non-zero
969 if( thread->Remaining-- )
971 // Reset quantum for next call
972 thread->Remaining = thread->Quantum;
975 __asm__ __volatile__ ( "mov %%esp, %0" : "=r" (esp) );
976 __asm__ __volatile__ ( "mov %%ebp, %0" : "=r" (ebp) );
978 if(eip == SWITCH_MAGIC) return; // Check if a switch happened
980 // Save machine state
981 thread->SavedState.ESP = esp;
982 thread->SavedState.EBP = ebp;
983 thread->SavedState.EIP = eip;
985 // TODO: Make this more stable somehow
986 regs = (tRegs*)(ebp+(2+2)*4); // EBP,Ret + CPU,CurThread
987 thread->SavedState.UserCS = regs->cs;
988 thread->SavedState.UserEIP = regs->eip;
990 if(thread->bInstrTrace) {
991 regs->eflags |= 0x100; // Set TF
992 Log("%p De-scheduled", thread);
995 regs->eflags &= ~0x100; // Clear TF
998 // Get next thread to run
999 thread = Threads_GetNextToRun(CPU, thread);
1002 #if DEBUG_TRACE_SWITCH
1004 Log("Switching to task %i(%s), CR3 = 0x%x, EIP = %p",
1007 thread->MemState.CR3,
1008 thread->SavedState.EIP
1013 // No avaliable tasks, just go into low power mode (idle thread)
1014 if(thread == NULL) {
1016 thread = gaCPUs[CPU].IdleThread;
1017 Log("CPU %i Running Idle Thread", CPU);
1019 thread = gpIdleThread;
1023 // Set current thread
1025 gaCPUs[CPU].Current = thread;
1027 gCurrentThread = thread;
1030 #if USE_MP // MP Debug
1031 // Log("CPU = %i, Thread %p", CPU, thread);
1034 // Update Kernel Stack pointer
1035 gTSSs[CPU].ESP0 = thread->KernelStack-4;
1038 if(thread->SavedState.ESP > 0xC0000000
1039 && thread->SavedState.ESP < thread->KernelStack-0x2000) {
1040 Log_Warning("Proc", "Possible bad ESP %p (PID %i)", thread->SavedState.ESP);
1044 if( thread->bInstrTrace ) {
1045 Log("%p Scheduled", thread);
1049 # error "Todo: Implement PAE Address space switching"
1051 // Set thread pointer
1052 __asm__ __volatile__("mov %0, %%db0\n\t" : : "r"(thread) );
1054 __asm__ __volatile__ (
1055 "mov %4, %%cr3\n\t" // Set address space
1056 "mov %1, %%esp\n\t" // Restore ESP
1057 "mov %2, %%ebp\n\t" // and EBP
1058 "or %5, 72(%%ebp)\n\t" // or trace flag to eflags (2+2+4+8+2)*4
1059 "jmp *%3" : : // And return to where we saved state (Proc_Clone or Proc_Scheduler)
1060 "a"(SWITCH_MAGIC), "b"(thread->SavedState.ESP),
1061 "d"(thread->SavedState.EBP), "c"(thread->SavedState.EIP),
1062 "r"(thread->MemState.CR3),
1063 "r"(thread->bInstrTrace&&thread->SavedState.EIP==(Uint)&GetEIP_Sched_ret?0x100:0)
1066 for(;;); // Shouldn't reach here
1070 EXPORT(Proc_SpawnWorker);