X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;ds=sidebyside;f=Kernel%2Farch%2Fx86%2Fproc.c;h=ad83c9919fb4159bc61f49f6b03ab6d9a855b06d;hb=8051546ad5894e093211d2ec69dde6b99cdaa71d;hp=e98841618b0a3a10fd827cf3788b28dc2b4cffae;hpb=814b2d0009da73b56c6def5d70a9dd97c7b17e2e;p=tpg%2Facess2.git diff --git a/Kernel/arch/x86/proc.c b/Kernel/arch/x86/proc.c index e9884161..ad83c991 100644 --- a/Kernel/arch/x86/proc.c +++ b/Kernel/arch/x86/proc.c @@ -3,6 +3,7 @@ * proc.c */ #include +#include #include #include #include @@ -13,72 +14,85 @@ // === FLAGS === #define DEBUG_TRACE_SWITCH 0 +#define DEBUG_DISABLE_DOUBLEFAULT 1 // === CONSTANTS === -#define SWITCH_MAGIC 0xFFFACE55 // There is no code in this area +#define SWITCH_MAGIC 0xFF5317C8 // FF SWITCH - There is no code in this area // Base is 1193182 -#define TIMER_DIVISOR 11931 //~100Hz +#define TIMER_BASE 1193182 +#define TIMER_DIVISOR 11932 //~100Hz + +// === TYPES === +#if USE_MP +typedef struct sCPU +{ + Uint8 APICID; + Uint8 State; // 0: Unavaliable, 1: Idle, 2: Active + Uint16 Resvd; + tThread *Current; + tThread *IdleThread; +} tCPU; +#endif // === IMPORTS === extern tGDT gGDT[]; extern tIDT gIDT[]; -extern void APStartup(); // 16-bit AP startup code -extern Uint GetEIP(); // start.asm +extern void APWait(void); // 16-bit AP pause code +extern void APStartup(void); // 16-bit AP startup code +extern Uint GetEIP(void); // start.asm +extern int GetCPUNum(void); // start.asm extern Uint32 gaInitPageDir[1024]; // start.asm -extern void Kernel_Stack_Top; -extern volatile int giThreadListLock; +extern char Kernel_Stack_Top[]; +extern tShortSpinlock glThreadListLock; extern int giNumCPUs; extern int giNextTID; -extern int giTotalTickets; -extern int giNumActiveThreads; extern tThread gThreadZero; -extern tThread *gActiveThreads; -extern tThread *gSleepingThreads; -extern tThread *gDeleteThreads; -extern tThread *Threads_GetNextToRun(int CPU); -extern void Threads_Dump(); extern tThread *Threads_CloneTCB(Uint *Err, Uint Flags); -extern void Isr8(); // Double Fault -extern void Proc_AlterUserReturnAddr(); +extern void Isr8(void); // Double Fault +extern void Proc_ReturnToUser(tVAddr Handler, Uint Argument); // === PROTOTYPES === -void ArchThreads_Init(); +void ArchThreads_Init(void); #if USE_MP void MP_StartAP(int CPU); void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode); #endif -void Proc_Start(); -tThread *Proc_GetCurThread(); -void Proc_ChangeStack(); +void Proc_Start(void); +tThread *Proc_GetCurThread(void); +void Proc_ChangeStack(void); int Proc_Clone(Uint *Err, Uint Flags); void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP); void Proc_CallFaultHandler(tThread *Thread); -void Proc_Scheduler(); +void Proc_Scheduler(int CPU); // === GLOBALS === // --- Multiprocessing --- #if USE_MP volatile int giNumInitingCPUs = 0; tMPInfo *gMPFloatPtr = NULL; +volatile Uint32 giMP_TimerCount; // Start Count for Local APIC Timer tAPIC *gpMP_LocalAPIC = NULL; Uint8 gaAPIC_to_CPU[256] = {0}; tCPU gaCPUs[MAX_CPUS]; +tTSS gaTSSs[MAX_CPUS]; // TSS Array + int giProc_BootProcessorID = 0; #else tThread *gCurrentThread = NULL; +tThread *gpIdleThread = NULL; #endif #if USE_PAE Uint32 *gPML4s[4] = NULL; #endif -tTSS *gTSSs = NULL; +tTSS *gTSSs = NULL; // Pointer to TSS array tTSS gTSS0 = {0}; // --- Error Recovery --- -char gaDoubleFaultStack[1024]; +char gaDoubleFaultStack[1024] __attribute__ ((section(".padata"))); tTSS gDoubleFault_TSS = { - .ESP0 = (Uint)&gaDoubleFaultStack[1023], + .ESP0 = (Uint)&gaDoubleFaultStack[1024], .SS0 = 0x10, .CR3 = (Uint)gaInitPageDir - KERNEL_BASE, .EIP = (Uint)Isr8, - .ESP = (Uint)&gaDoubleFaultStack[1023], + .ESP = (Uint)&gaDoubleFaultStack[1024], .CS = 0x08, .SS = 0x10, .DS = 0x10, .ES = 0x10, .FS = 0x10, .GS = 0x10, @@ -86,10 +100,10 @@ tTSS gDoubleFault_TSS = { // === CODE === /** - * \fn void ArchThreads_Init() + * \fn void ArchThreads_Init(void) * \brief Starts the process scheduler */ -void ArchThreads_Init() +void ArchThreads_Init(void) { Uint pos = 0; @@ -169,7 +183,7 @@ void ArchThreads_Init() Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum); Log("}"); - gpMP_LocalAPIC = (void*)MM_MapHWPage(mptable->LocalAPICMemMap, 1); + gpMP_LocalAPIC = (void*)MM_MapHWPages(mptable->LocalAPICMemMap, 1); ents = mptable->Entries; giNumCPUs = 0; @@ -206,18 +220,19 @@ void ArchThreads_Init() gaCPUs[giNumCPUs].State = 0; giNumCPUs ++; - // Send IPI - if( !(ents->Proc.CPUFlags & 2) ) - { - MP_StartAP( giNumCPUs-1 ); + // Set BSP Variable + if( ents->Proc.CPUFlags & 2 ) { + giProc_BootProcessorID = giNumCPUs-1; } break; + + #if DUMP_MP_TABLES case 1: // Bus entSize = 8; Log("%i: Bus", i); Log("\t.ID = %i", ents->Bus.ID); - Log("\t.TypeString = '%6c'", ents->Bus.TypeString); + Log("\t.TypeString = '%6C'", ents->Bus.TypeString); break; case 2: // I/O APIC entSize = 8; @@ -250,6 +265,7 @@ void ArchThreads_Init() default: Log("%i: Unknown (%i)", i, ents->Type); break; + #endif } ents = (void*)( (Uint)ents + entSize ); } @@ -258,11 +274,7 @@ void ArchThreads_Init() Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS); giNumCPUs = MAX_CPUS; } - - while( giNumInitingCPUs ) - MM_FinishVirtualInit(); - - Panic("Uh oh... MP Table Parsing is unimplemented\n"); + gTSSs = gaTSSs; } else { Log("No MP Table was found, assuming uniprocessor\n"); @@ -275,29 +287,50 @@ void ArchThreads_Init() MM_FinishVirtualInit(); #endif + #if !DEBUG_DISABLE_DOUBLEFAULT // Initialise Double Fault TSS - /* - gGDT[5].LimitLow = sizeof(tTSS); - gGDT[5].LimitHi = 0; - gGDT[5].Access = 0x89; // Type - gGDT[5].Flags = 0x4; - */ gGDT[5].BaseLow = (Uint)&gDoubleFault_TSS & 0xFFFF; gGDT[5].BaseMid = (Uint)&gDoubleFault_TSS >> 16; gGDT[5].BaseHi = (Uint)&gDoubleFault_TSS >> 24; - Log_Debug("Proc", "gIDT[8] = {OffsetLo:%04x, CS:%04x, Flags:%04x, OffsetHi:%04x}", - gIDT[8].OffsetLo, gIDT[8].CS, gIDT[8].Flags, gIDT[8].OffsetHi); + // Set double fault IDT to use the new TSS gIDT[8].OffsetLo = 0; gIDT[8].CS = 5<<3; gIDT[8].Flags = 0x8500; gIDT[8].OffsetHi = 0; - Log_Debug("Proc", "gIDT[8] = {OffsetLo:%04x, CS:%04x, Flags:%04x, OffsetHi:%04x}", - gIDT[8].OffsetLo, gIDT[8].CS, gIDT[8].Flags, gIDT[8].OffsetHi); + #endif + + // Set timer frequency + outb(0x43, 0x34); // Set Channel 0, Low/High, Rate Generator + outb(0x40, TIMER_DIVISOR&0xFF); // Low Byte of Divisor + outb(0x40, (TIMER_DIVISOR>>8)&0xFF); // High Byte - //__asm__ __volatile__ ("xchg %bx, %bx"); + Log("Timer Frequency %i.%03i Hz", + TIMER_BASE/TIMER_DIVISOR, + ((Uint64)TIMER_BASE*1000/TIMER_DIVISOR)%1000 + ); #if USE_MP + // Get the count setting for APIC timer + Log("Determining APIC Count"); + __asm__ __volatile__ ("sti"); + while( giMP_TimerCount == 0 ) __asm__ __volatile__ ("hlt"); + __asm__ __volatile__ ("cli"); + Log("APIC Count %i", giMP_TimerCount); + { + Uint64 freq = giMP_TimerCount; + freq /= TIMER_DIVISOR; + freq *= TIMER_BASE; + if( (freq /= 1000) < 2*1000) + Log("Bus Frequency %i KHz", freq); + else if( (freq /= 1000) < 2*1000) + Log("Bus Frequency %i MHz", freq); + else if( (freq /= 1000) < 2*1000) + Log("Bus Frequency %i GHz", freq); + else + Log("Bus Frequency %i THz", freq); + } + // Initialise Normal TSS(s) for(pos=0;pos> 16; + gGDT[6+pos].BaseMid = ((Uint)(&gTSSs[pos]) >> 16) & 0xFFFF; gGDT[6+pos].BaseHi = ((Uint)(&gTSSs[pos])) >> 24; #if USE_MP } - for(pos=0;pos>8)&0xFF); // High Byte - // Create Per-Process Data Block MM_Allocate(MM_PPD_CFG); @@ -348,58 +378,129 @@ void ArchThreads_Init() void MP_StartAP(int CPU) { Log("Starting AP %i (APIC %i)", CPU, gaCPUs[CPU].APICID); + // Set location of AP startup code and mark for a warm restart - *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0); + *(Uint16*)(KERNEL_BASE|0x467) = (Uint)&APWait - (KERNEL_BASE|0xFFFF0); *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF; - outb(0x70, 0x0F); outb(0x71, 0x0A); // Warm Reset - MP_SendIPI(gaCPUs[CPU].APICID, 0, 5); + outb(0x70, 0x0F); outb(0x71, 0x0A); // Set warm reset flag + MP_SendIPI(gaCPUs[CPU].APICID, 0, 5); // Init IPI + + // Delay + inb(0x80); inb(0x80); inb(0x80); inb(0x80); + + // TODO: Use a better address, preferably registered with the MM + // - MM_AllocDMA mabye? + // Create a far jump + *(Uint8*)(KERNEL_BASE|0x11000) = 0xEA; // Far JMP + *(Uint16*)(KERNEL_BASE|0x11001) = (Uint)&APStartup - (KERNEL_BASE|0xFFFF0); // IP + *(Uint16*)(KERNEL_BASE|0x11003) = 0xFFFF; // CS + // Send a Startup-IPI to make the CPU execute at 0x11000 (which we + // just filled) + MP_SendIPI(gaCPUs[CPU].APICID, 0x11, 6); // StartupIPI + giNumInitingCPUs ++; } +/** + * \brief Send an Inter-Processor Interrupt + * \param APICID Processor's Local APIC ID + * \param Vector Argument of some kind + * \param DeliveryMode Type of signal? + */ void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode) { - Uint32 addr = (Uint)gpMP_LocalAPIC + 0x300; Uint32 val; // Hi val = (Uint)APICID << 24; - Log("*%p = 0x%08x", addr+0x10, val); - *(Uint32*)(addr+0x10) = val; + Log("*%p = 0x%08x", &gpMP_LocalAPIC->ICR[1], val); + gpMP_LocalAPIC->ICR[1].Val = val; // Low (and send) val = ((DeliveryMode & 7) << 8) | (Vector & 0xFF); - Log("*%p = 0x%08x", addr, val); - *(Uint32*)addr = val; + Log("*%p = 0x%08x", &gpMP_LocalAPIC->ICR[0], val); + gpMP_LocalAPIC->ICR[0].Val = val; } #endif /** - * \fn void Proc_Start() + * \fn void Proc_Start(void) * \brief Start process scheduler */ -void Proc_Start() +void Proc_Start(void) { + #if USE_MP + int i; + #endif + + #if USE_MP + // Start APs + for( i = 0; i < giNumCPUs; i ++ ) + { + int tid; + if(i) gaCPUs[i].Current = NULL; + + // Create Idle Task + if( (tid = Proc_Clone(0, 0)) == 0) + { + for(;;) HALT(); // Just yeilds + } + gaCPUs[i].IdleThread = Threads_GetThread(tid); + gaCPUs[i].IdleThread->ThreadName = "Idle Thread"; + Threads_SetPriority( gaCPUs[i].IdleThread, -1 ); // Never called randomly + gaCPUs[i].IdleThread->Quantum = 1; // 1 slice quantum + + + // Start the AP + if( i != giProc_BootProcessorID ) { + MP_StartAP( i ); + } + } + + // BSP still should run the current task + gaCPUs[0].Current = &gThreadZero; + + // Start interrupts and wait for APs to come up + Log("Waiting for APs to come up\n"); + __asm__ __volatile__ ("sti"); + while( giNumInitingCPUs ) __asm__ __volatile__ ("hlt"); + #else + // Create Idle Task + if(Proc_Clone(0, 0) == 0) + { + gpIdleThread = Proc_GetCurThread(); + gpIdleThread->ThreadName = "Idle Thread"; + Threads_SetPriority( gpIdleThread, -1 ); // Never called randomly + gpIdleThread->Quantum = 1; // 1 slice quantum + for(;;) HALT(); // Just yeilds + } + + // Set current task + gCurrentThread = &gThreadZero; + // Start Interrupts (and hence scheduler) __asm__ __volatile__("sti"); + #endif + MM_FinishVirtualInit(); } /** - * \fn tThread *Proc_GetCurThread() + * \fn tThread *Proc_GetCurThread(void) * \brief Gets the current thread */ -tThread *Proc_GetCurThread() +tThread *Proc_GetCurThread(void) { #if USE_MP - return gaCPUs[ gaAPIC_to_CPU[gpMP_LocalAPIC->ID.Val&0xFF] ].Current; + return gaCPUs[ GetCPUNum() ].Current; #else return gCurrentThread; #endif } /** - * \fn void Proc_ChangeStack() + * \fn void Proc_ChangeStack(void) * \brief Swaps the current stack for a new one (in the proper stack reigon) */ -void Proc_ChangeStack() +void Proc_ChangeStack(void) { Uint esp, ebp; Uint tmpEbp, oldEsp; @@ -470,7 +571,11 @@ int Proc_Clone(Uint *Err, Uint Flags) Uint tmpEbp, oldEsp = esp; // Set CR3 + #if USE_PAE + # warning "PAE Unimplemented" + #else newThread->MemState.CR3 = cur->MemState.CR3; + #endif // Create new KStack newThread->KernelStack = MM_NewKStack(); @@ -503,7 +608,15 @@ int Proc_Clone(Uint *Err, Uint Flags) newThread->SavedState.EBP = ebp; eip = GetEIP(); if(eip == SWITCH_MAGIC) { - outb(0x20, 0x20); // ACK Timer and return as child + __asm__ __volatile__ ("mov %0, %%db0" : : "r" (newThread) ); + #if USE_MP + // ACK the interrupt + if( GetCPUNum() ) + gpMP_LocalAPIC->EOI.Val = 0; + else + #endif + outb(0x20, 0x20); // ACK Timer and return as child + __asm__ __volatile__ ("sti"); // Restart interrupts return 0; } @@ -517,10 +630,10 @@ int Proc_Clone(Uint *Err, Uint Flags) } /** - * \fn int Proc_SpawnWorker() + * \fn int Proc_SpawnWorker(void) * \brief Spawns a new worker thread */ -int Proc_SpawnWorker() +int Proc_SpawnWorker(void) { tThread *new, *cur; Uint eip, esp, ebp; @@ -537,7 +650,7 @@ int Proc_SpawnWorker() // Set Thread ID new->TID = giNextTID++; // Create a new worker stack (in PID0's address space) - // The stack is relocated by this code + // - The stack is relocated by this function new->KernelStack = MM_NewWorkerStack(); // Get ESP and EBP based in the new stack @@ -551,24 +664,31 @@ int Proc_SpawnWorker() new->SavedState.EBP = ebp; eip = GetEIP(); if(eip == SWITCH_MAGIC) { - outb(0x20, 0x20); // ACK Timer and return as child + __asm__ __volatile__ ("mov %0, %%db0" : : "r"(new)); + #if USE_MP + // ACK the interrupt + if(GetCPUNum()) + gpMP_LocalAPIC->EOI.Val = 0; + else + #endif + outb(0x20, 0x20); // ACK Timer and return as child + __asm__ __volatile__ ("sti"); // Restart interrupts return 0; } // Set EIP as parent new->SavedState.EIP = eip; // Mark as active - new->Status = THREAD_STAT_ACTIVE; Threads_AddActive( new ); return new->TID; } /** - * \fn Uint Proc_MakeUserStack() + * \fn Uint Proc_MakeUserStack(void) * \brief Creates a new user stack */ -Uint Proc_MakeUserStack() +Uint Proc_MakeUserStack(void) { int i; Uint base = USER_STACK_TOP - USER_STACK_SZ; @@ -581,13 +701,12 @@ Uint Proc_MakeUserStack() if(i != -1) return 0; // Allocate Stack - Allocate incrementally to clean up MM_Dump output - for( i = 0; i < USER_STACK_SZ/4069; i++ ) + for( i = 0; i < USER_STACK_SZ/0x1000; i++ ) MM_Allocate( base + (i<<12) ); return base + USER_STACK_SZ; } - /** * \fn void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize) * \brief Starts a user task @@ -599,19 +718,30 @@ void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char ** Uint delta; Uint16 ss, cs; - LOG("stack = 0x%x", stack); + //Log("stack = %p", stack); // Copy Arguments - stack = (void*)( (Uint)stack - DataSize ); + stack -= DataSize/sizeof(*stack); memcpy( stack, ArgV, DataSize ); - // Adjust Arguments and environment - delta = (Uint)stack - (Uint)ArgV; - ArgV = (char**)stack; - for( i = 0; ArgV[i]; i++ ) ArgV[i] += delta; - i ++; - EnvP = &ArgV[i]; - for( i = 0; EnvP[i]; i++ ) EnvP[i] += delta; + //Log("stack = %p", stack); + + if( DataSize ) + { + // Adjust Arguments and environment + delta = (Uint)stack - (Uint)ArgV; + ArgV = (char**)stack; + for( i = 0; ArgV[i]; i++ ) + ArgV[i] += delta; + i ++; + + // Do we care about EnvP? + if( EnvP ) { + EnvP = &ArgV[i]; + for( i = 0; EnvP[i]; i++ ) + EnvP[i] += delta; + } + } // User Mode Segments ss = 0x23; cs = 0x1B; @@ -703,7 +833,7 @@ void Proc_CallFaultHandler(tThread *Thread) { // Rewinds the stack and calls the user function // Never returns - __asm__ __volatile__ ("mov %0, %%ebp;\n\tcall Proc_AlterUserReturnAddr" :: "r"(Thread->FaultHandler)); + Proc_ReturnToUser( Thread->FaultHandler, Thread->CurFaultNum ); for(;;); } @@ -717,25 +847,7 @@ void Proc_Scheduler(int CPU) tThread *thread; // If the spinlock is set, let it complete - if(giThreadListLock) return; - - // Clear Delete Queue - while(gDeleteThreads) - { - thread = gDeleteThreads->Next; - if(gDeleteThreads->IsLocked) { // Only free if structure is unused - gDeleteThreads->Status = THREAD_STAT_NULL; - free( gDeleteThreads ); - } - gDeleteThreads = thread; - } - - // Check if there is any tasks running - if(giNumActiveThreads == 0) { - Log("No Active threads, sleeping"); - __asm__ __volatile__ ("hlt"); - return; - } + if(IS_LOCKED(&glThreadListLock)) return; // Get current thread #if USE_MP @@ -744,31 +856,46 @@ void Proc_Scheduler(int CPU) thread = gCurrentThread; #endif - // Reduce remaining quantum and continue timeslice if non-zero - if(thread->Remaining--) return; - // Reset quantum for next call - thread->Remaining = thread->Quantum; - - // Get machine state - __asm__ __volatile__ ("mov %%esp, %0":"=r"(esp)); - __asm__ __volatile__ ("mov %%ebp, %0":"=r"(ebp)); - eip = GetEIP(); - if(eip == SWITCH_MAGIC) return; // Check if a switch happened - - // Save machine state - thread->SavedState.ESP = esp; - thread->SavedState.EBP = ebp; - thread->SavedState.EIP = eip; + if( thread ) + { + // Reduce remaining quantum and continue timeslice if non-zero + if( thread->Remaining-- ) + return; + // Reset quantum for next call + thread->Remaining = thread->Quantum; + + // Get machine state + __asm__ __volatile__ ( "mov %%esp, %0" : "=r" (esp) ); + __asm__ __volatile__ ( "mov %%ebp, %0" : "=r" (ebp) ); + eip = GetEIP(); + if(eip == SWITCH_MAGIC) return; // Check if a switch happened + + // Save machine state + thread->SavedState.ESP = esp; + thread->SavedState.EBP = ebp; + thread->SavedState.EIP = eip; + } - // Get next thread - thread = Threads_GetNextToRun(CPU); + // Get next thread to run + thread = Threads_GetNextToRun(CPU, thread); - // Error Check + // No avaliable tasks, just go into low power mode (idle thread) if(thread == NULL) { - Warning("Hmm... Threads_GetNextToRun returned NULL, I don't think this should happen.\n"); - return; + #if USE_MP + thread = gaCPUs[CPU].IdleThread; + Log("CPU %i Running Idle Thread", CPU); + #else + thread = gpIdleThread; + #endif } + // Set current thread + #if USE_MP + gaCPUs[CPU].Current = thread; + #else + gCurrentThread = thread; + #endif + #if DEBUG_TRACE_SWITCH Log("Switching to task %i, CR3 = 0x%x, EIP = %p", thread->TID, @@ -777,11 +904,8 @@ void Proc_Scheduler(int CPU) ); #endif - // Set current thread - #if USE_MP - gaCPUs[CPU].Current = thread; - #else - gCurrentThread = thread; + #if USE_MP // MP Debug + Log("CPU = %i, Thread %p", CPU, thread); #endif // Update Kernel Stack pointer @@ -791,7 +915,7 @@ void Proc_Scheduler(int CPU) #if USE_PAE # error "Todo: Implement PAE Address space switching" #else - __asm__ __volatile__ ("mov %0, %%cr3"::"a"(thread->MemState.CR3)); + __asm__ __volatile__ ("mov %0, %%cr3" : : "a" (thread->MemState.CR3)); #endif #if 0