* AcessOS Microkernel Version
* proc.c
*/
-#include <common.h>
+#include <acess.h>
+#include <threads.h>
#include <proc.h>
+#include <desctab.h>
#include <mm_virt.h>
#include <errno.h>
#if USE_MP
# include <mp.h>
#endif
+#include <hal_proc.h>
+#include <arch_int.h>
+
+// === FLAGS ===
+#define DEBUG_TRACE_SWITCH 0
+#define DEBUG_DISABLE_DOUBLEFAULT 1
+#define DEBUG_VERY_SLOW_PERIOD 0
// === CONSTANTS ===
-#define SWITCH_MAGIC 0xFFFACE55 // There is no code in this area
-#define DEFAULT_QUANTUM 10
-#define DEFAULT_TICKETS 5
-#define MAX_TICKETS 10
-#define TIMER_DIVISOR 11931 //~100Hz
+// Base is 1193182
+#define TIMER_BASE 1193182
+#if DEBUG_VERY_SLOW_PERIOD
+# define TIMER_DIVISOR 1193 //~10Hz switch, with 10 quantum = 1s per thread
+#else
+# define TIMER_DIVISOR 11932 //~100Hz
+#endif
+
+// === TYPES ===
+typedef struct sCPU
+{
+ Uint8 APICID;
+ Uint8 State; // 0: Unavaliable, 1: Idle, 2: Active
+ Uint16 Resvd;
+ tThread *Current;
+} tCPU;
// === IMPORTS ===
extern tGDT gGDT[];
-extern Uint GetEIP(); // start.asm
+extern tIDT gIDT[];
+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 Uint GetEIP_Sched(void); // proc.asm
+extern void NewTaskHeader(tThread *Thread, void *Fcn, int nArgs, ...); // Actually takes cdecl args
+extern Uint Proc_CloneInt(Uint *ESP, Uint32 *CR3);
extern Uint32 gaInitPageDir[1024]; // start.asm
-extern void Kernel_Stack_Top;
+extern char Kernel_Stack_Top[];
+extern int giNumCPUs;
+extern int giNextTID;
+extern tThread gThreadZero;
+extern void Isr8(void); // Double Fault
+extern void Proc_ReturnToUser(tVAddr Handler, Uint Argument, tVAddr KernelStack);
+extern char scheduler_return[]; // Return address in SchedulerBase
+extern char IRQCommon[]; // Common IRQ handler code
+extern char IRQCommon_handled[]; // IRQCommon call return location
+extern char GetEIP_Sched_ret[]; // GetEIP call return location
+extern void SwitchTasks(Uint NewSP, Uint *OldSP, Uint NewIP, Uint *OldIO, Uint CR3);
+extern void Proc_InitialiseSSE(void);
+extern void Proc_SaveSSE(Uint DestPtr);
+extern void Proc_DisableSSE(void);
// === PROTOTYPES ===
-void Proc_Start();
-void Proc_ChangeStack();
- int Proc_Clone(Uint *Err, Uint Flags);
-void Proc_Exit();
-void Proc_Yield();
-void Proc_Sleep();
-static tThread *Proc_int_GetPrevThread(tThread **List, tThread *Thread);
-void Proc_Scheduler();
-Sint64 now();
-Uint rand();
-
-// === GLOBALS ===
-// -- Core Thread --
-tThread gThreadZero = {
- NULL, 0, // Next, Lock
- THREAD_STAT_ACTIVE, // Status
- 0, 0, // TID, TGID
- 0, 0, // UID, GID
- "ThreadZero", // Name
- 0, 0, 0, // ESP, EBP, EIP (Set on switch)
- #if USE_PAE
- {0,0,0}, // PML4 Entries
- #else
- (Uint)&gaInitPageDir-KERNEL_BASE, // CR3
- #endif
- (Uint)&Kernel_Stack_Top, // Kernel Stack (Unused as it is PL0)
- NULL, NULL, // Messages, Last Message
- DEFAULT_QUANTUM, DEFAULT_QUANTUM, // Quantum, Remaining
- DEFAULT_TICKETS,
- {0} // Default config to zero
- };
-// -- Processes --
-// --- Locks ---
-volatile int giThreadListLock = 0; ///\note NEVER use a heap function while locked
-// --- Current State ---
+//void ArchThreads_Init(void);
#if USE_MP
-tThread **gCurrentThread = NULL;
-# define CUR_THREAD gCurrentThread[0]
-#else
-tThread *gCurrentThread = NULL;
-# define CUR_THREAD gCurrentThread
+void MP_StartAP(int CPU);
+void MP_SendIPIVector(int CPU, Uint8 Vector);
+void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode);
#endif
-volatile int giNumActiveThreads = 0;
-volatile int giTotalTickets = 0;
-volatile Uint giNextTID = 1;
-// --- Thread Lists ---
-tThread *gActiveThreads = NULL; // Currently Running Threads
-tThread *gSleepingThreads = NULL; // Sleeping Threads
-tThread *gDeleteThreads = NULL; // Threads to delete
+void Proc_IdleThread(void *Ptr);
+//void Proc_Start(void);
+//tThread *Proc_GetCurThread(void);
+void Proc_ChangeStack(void);
+// int Proc_NewKThread(void (*Fcn)(void*), void *Data);
+// int Proc_Clone(Uint *Err, Uint Flags);
+Uint Proc_MakeUserStack(void);
+//void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize);
+void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP) NORETURN;
+ int Proc_Demote(Uint *Err, int Dest, tRegs *Regs);
+//void Proc_CallFaultHandler(tThread *Thread);
+//void Proc_DumpThreadCPUState(tThread *Thread);
+void Proc_Scheduler(int CPU);
+
+// === GLOBALS ===
// --- Multiprocessing ---
- int giNumCPUs = 1;
#if USE_MP
-tMPInfo *gMPTable = NULL;
+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};
+ int giProc_BootProcessorID = 0;
+tTSS gaTSSs[MAX_CPUS]; // TSS Array
#endif
-#if USE_PAE
-Uint32 *gPML4s[4] = NULL;
-#endif
-tTSS *gTSSs = NULL;
-#if !USE_MP
+tCPU gaCPUs[MAX_CPUS] = {
+ {.Current = &gThreadZero}
+ };
+tTSS *gTSSs = NULL; // Pointer to TSS array
tTSS gTSS0 = {0};
-#endif
+// --- Error Recovery ---
+char gaDoubleFaultStack[1024] __attribute__ ((section(".padata")));
+tTSS gDoubleFault_TSS = {
+ .ESP0 = (Uint)&gaDoubleFaultStack[1024],
+ .SS0 = 0x10,
+ .CR3 = (Uint)gaInitPageDir - KERNEL_BASE,
+ .EIP = (Uint)Isr8,
+ .ESP = (Uint)&gaDoubleFaultStack[1024],
+ .CS = 0x08, .SS = 0x10,
+ .DS = 0x10, .ES = 0x10,
+ .FS = 0x10, .GS = 0x10,
+};
// === CODE ===
/**
- * \fn void Proc_Start()
+ * \fn void ArchThreads_Init(void)
* \brief Starts the process scheduler
*/
-void Proc_Start()
+void ArchThreads_Init(void)
{
Uint pos = 0;
#if USE_MP
+ tMPTable *mptable;
+
+ // Mark BSP as active
+ gaCPUs[0].State = 2;
+
// -- Initialise Multiprocessing
// Find MP Floating Table
- // - EBDA
- for(pos = KERNEL_BASE|0x9FC00; pos < (KERNEL_BASE|0xA0000); pos += 16) {
- if( *(Uint*)(pos) == MPTABLE_IDENT ) {
- if(ByteSum( (void*)pos, sizeof(tMPInfo) ) != 0) continue;
- gMPTable = (void*)pos;
+ // - EBDA/Last 1Kib (640KiB)
+ for(pos = KERNEL_BASE|0x9F000; pos < (KERNEL_BASE|0xA0000); pos += 16) {
+ if( *(Uint*)(pos) == MPPTR_IDENT ) {
+ Log("Possible %p", pos);
+ if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
+ gMPFloatPtr = (void*)pos;
break;
}
}
- // - Last KiB
- if(!gMPTable) {
-
+ // - Last KiB (512KiB base mem)
+ if(!gMPFloatPtr) {
+ for(pos = KERNEL_BASE|0x7F000; pos < (KERNEL_BASE|0x80000); pos += 16) {
+ if( *(Uint*)(pos) == MPPTR_IDENT ) {
+ Log("Possible %p", pos);
+ if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
+ gMPFloatPtr = (void*)pos;
+ break;
+ }
+ }
}
// - BIOS ROM
- if(!gMPTable) {
- for(pos = KERNEL_BASE|0xF0000; pos < (KERNEL_BASE|0x100000); pos += 16) {
- if( *(Uint*)(pos) == MPTABLE_IDENT ) {
- if(ByteSum( (void*)pos, sizeof(tMPInfo) ) != 0) continue;
- gMPTable = (void*)pos;
+ if(!gMPFloatPtr) {
+ for(pos = KERNEL_BASE|0xE0000; pos < (KERNEL_BASE|0x100000); pos += 16) {
+ if( *(Uint*)(pos) == MPPTR_IDENT ) {
+ Log("Possible %p", pos);
+ if( ByteSum((void*)pos, sizeof(tMPInfo)) != 0 ) continue;
+ gMPFloatPtr = (void*)pos;
break;
}
}
}
// If the MP Table Exists, parse it
- if(gMPTable)
+ if(gMPFloatPtr)
{
- Panic("Uh oh... MP Table Parsing is unimplemented\n");
- } else {
- #endif
+ int i;
+ tMPTable_Ent *ents;
+ #if DUMP_MP_TABLE
+ Log("gMPFloatPtr = %p", gMPFloatPtr);
+ Log("*gMPFloatPtr = {");
+ Log("\t.Sig = 0x%08x", gMPFloatPtr->Sig);
+ Log("\t.MPConfig = 0x%08x", gMPFloatPtr->MPConfig);
+ Log("\t.Length = 0x%02x", gMPFloatPtr->Length);
+ Log("\t.Version = 0x%02x", gMPFloatPtr->Version);
+ Log("\t.Checksum = 0x%02x", gMPFloatPtr->Checksum);
+ Log("\t.Features = [0x%02x,0x%02x,0x%02x,0x%02x,0x%02x]",
+ gMPFloatPtr->Features[0], gMPFloatPtr->Features[1],
+ gMPFloatPtr->Features[2], gMPFloatPtr->Features[3],
+ gMPFloatPtr->Features[4]
+ );
+ Log("}");
+ #endif
+
+ mptable = (void*)( KERNEL_BASE|gMPFloatPtr->MPConfig );
+ #if DUMP_MP_TABLE
+ Log("mptable = %p", mptable);
+ Log("*mptable = {");
+ Log("\t.Sig = 0x%08x", mptable->Sig);
+ Log("\t.BaseTableLength = 0x%04x", mptable->BaseTableLength);
+ Log("\t.SpecRev = 0x%02x", mptable->SpecRev);
+ Log("\t.Checksum = 0x%02x", mptable->Checksum);
+ Log("\t.OEMID = '%8c'", mptable->OemID);
+ Log("\t.ProductID = '%8c'", mptable->ProductID);
+ Log("\t.OEMTablePtr = %p'", mptable->OEMTablePtr);
+ Log("\t.OEMTableSize = 0x%04x", mptable->OEMTableSize);
+ Log("\t.EntryCount = 0x%04x", mptable->EntryCount);
+ Log("\t.LocalAPICMemMap = 0x%08x", mptable->LocalAPICMemMap);
+ Log("\t.ExtendedTableLen = 0x%04x", mptable->ExtendedTableLen);
+ Log("\t.ExtendedTableChecksum = 0x%02x", mptable->ExtendedTableChecksum);
+ Log("}");
+ #endif
+
+ gpMP_LocalAPIC = (void*)MM_MapHWPages(mptable->LocalAPICMemMap, 1);
+
+ ents = mptable->Entries;
+ giNumCPUs = 0;
+
+ for( i = 0; i < mptable->EntryCount; i ++ )
+ {
+ int entSize = 0;
+ switch( ents->Type )
+ {
+ case 0: // Processor
+ entSize = 20;
+ #if DUMP_MP_TABLE
+ Log("%i: Processor", i);
+ Log("\t.APICID = %i", ents->Proc.APICID);
+ Log("\t.APICVer = 0x%02x", ents->Proc.APICVer);
+ Log("\t.CPUFlags = 0x%02x", ents->Proc.CPUFlags);
+ Log("\t.CPUSignature = 0x%08x", ents->Proc.CPUSignature);
+ Log("\t.FeatureFlags = 0x%08x", ents->Proc.FeatureFlags);
+ #endif
+
+ if( !(ents->Proc.CPUFlags & 1) ) {
+ Log("DISABLED");
+ break;
+ }
+
+ // Check if there is too many processors
+ if(giNumCPUs >= MAX_CPUS) {
+ giNumCPUs ++; // If `giNumCPUs` > MAX_CPUS later, it will be clipped
+ break;
+ }
+
+ // Initialise CPU Info
+ gaAPIC_to_CPU[ents->Proc.APICID] = giNumCPUs;
+ gaCPUs[giNumCPUs].APICID = ents->Proc.APICID;
+ gaCPUs[giNumCPUs].State = 0;
+ giNumCPUs ++;
+
+ // Set BSP Variable
+ if( ents->Proc.CPUFlags & 2 ) {
+ giProc_BootProcessorID = giNumCPUs-1;
+ }
+
+ break;
+
+ #if DUMP_MP_TABLE >= 2
+ case 1: // Bus
+ entSize = 8;
+ Log("%i: Bus", i);
+ Log("\t.ID = %i", ents->Bus.ID);
+ Log("\t.TypeString = '%6C'", ents->Bus.TypeString);
+ break;
+ case 2: // I/O APIC
+ entSize = 8;
+ Log("%i: I/O APIC", i);
+ Log("\t.ID = %i", ents->IOAPIC.ID);
+ Log("\t.Version = 0x%02x", ents->IOAPIC.Version);
+ Log("\t.Flags = 0x%02x", ents->IOAPIC.Flags);
+ Log("\t.Addr = 0x%08x", ents->IOAPIC.Addr);
+ break;
+ case 3: // I/O Interrupt Assignment
+ entSize = 8;
+ Log("%i: I/O Interrupt Assignment", i);
+ Log("\t.IntType = %i", ents->IOInt.IntType);
+ Log("\t.Flags = 0x%04x", ents->IOInt.Flags);
+ Log("\t.SourceBusID = 0x%02x", ents->IOInt.SourceBusID);
+ Log("\t.SourceBusIRQ = 0x%02x", ents->IOInt.SourceBusIRQ);
+ Log("\t.DestAPICID = 0x%02x", ents->IOInt.DestAPICID);
+ Log("\t.DestAPICIRQ = 0x%02x", ents->IOInt.DestAPICIRQ);
+ break;
+ case 4: // Local Interrupt Assignment
+ entSize = 8;
+ Log("%i: Local Interrupt Assignment", i);
+ Log("\t.IntType = %i", ents->LocalInt.IntType);
+ Log("\t.Flags = 0x%04x", ents->LocalInt.Flags);
+ Log("\t.SourceBusID = 0x%02x", ents->LocalInt.SourceBusID);
+ Log("\t.SourceBusIRQ = 0x%02x", ents->LocalInt.SourceBusIRQ);
+ Log("\t.DestLocalAPICID = 0x%02x", ents->LocalInt.DestLocalAPICID);
+ Log("\t.DestLocalAPICIRQ = 0x%02x", ents->LocalInt.DestLocalAPICIRQ);
+ break;
+ default:
+ Log("%i: Unknown (%i)", i, ents->Type);
+ break;
+ #endif
+ }
+ ents = (void*)( (Uint)ents + entSize );
+ }
+
+ if( giNumCPUs > MAX_CPUS ) {
+ Warning("Too many CPUs detected (%i), only using %i of them", giNumCPUs, MAX_CPUS);
+ giNumCPUs = MAX_CPUS;
+ }
+ gTSSs = gaTSSs;
+ }
+ else {
+ Log("No MP Table was found, assuming uniprocessor\n");
giNumCPUs = 1;
gTSSs = &gTSS0;
+ }
+ #else
+ giNumCPUs = 1;
+ gTSSs = &gTSS0;
+ #endif
+
+ #if !DEBUG_DISABLE_DOUBLEFAULT
+ // Initialise Double Fault TSS
+ gGDT[5].BaseLow = (Uint)&gDoubleFault_TSS & 0xFFFF;
+ gGDT[5].BaseMid = (Uint)&gDoubleFault_TSS >> 16;
+ gGDT[5].BaseHi = (Uint)&gDoubleFault_TSS >> 24;
+
+ // 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;
+ #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
+
+ Log_Debug("Proc", "PIT 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_BASE;
+ freq /= TIMER_DIVISOR;
+ 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 TSS
+ // Initialise Normal TSS(s)
for(pos=0;pos<giNumCPUs;pos++)
{
#else
#endif
gTSSs[pos].SS0 = 0x10;
gTSSs[pos].ESP0 = 0; // Set properly by scheduler
- gGDT[5+pos].LimitLow = sizeof(tTSS);
- gGDT[5+pos].LimitHi = 0;
- gGDT[5+pos].Access = 0x89; // Type
- gGDT[5+pos].Flags = 0x4;
- gGDT[5+pos].BaseLow = (Uint)&gTSSs[pos] & 0xFFFF;
- gGDT[5+pos].BaseMid = (Uint)&gTSSs[pos] >> 16;
- gGDT[5+pos].BaseHi = (Uint)&gTSSs[pos] >> 24;
- #if USE_MP
- }
- for(pos=0;pos<giNumCPUs;pos++) {
- #endif
- __asm__ __volatile__ ("ltr %%ax"::"a"(0x28+pos*8));
+ gGDT[6+pos].BaseLow = ((Uint)(&gTSSs[pos])) & 0xFFFF;
+ gGDT[6+pos].BaseMid = ((Uint)(&gTSSs[pos]) >> 16) & 0xFFFF;
+ gGDT[6+pos].BaseHi = ((Uint)(&gTSSs[pos])) >> 24;
#if USE_MP
}
#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
+ // Load the BSP's TSS
+ __asm__ __volatile__ ("ltr %%ax"::"a"(0x30));
+ // Set Current Thread and CPU Number in DR0 and DR1
+ __asm__ __volatile__ ("mov %0, %%db0"::"r"(&gThreadZero));
+ __asm__ __volatile__ ("mov %0, %%db1"::"r"(0));
- // Create Initial Task
- gActiveThreads = &gThreadZero;
- gCurrentThread = &gThreadZero;
- giTotalTickets = gThreadZero.NumTickets;
- giNumActiveThreads = 1;
+ gaCPUs[0].Current = &gThreadZero;
+ gThreadZero.CurCPU = 0;
+
+ gThreadZero.MemState.CR3 = (Uint)gaInitPageDir - KERNEL_BASE;
// Create Per-Process Data Block
- MM_Allocate(MM_PPD_CFG);
+ if( !MM_Allocate(MM_PPD_CFG) )
+ {
+ Panic("OOM - No space for initial Per-Process Config");
+ }
+
+ // Initialise SSE support
+ Proc_InitialiseSSE();
// Change Stacks
Proc_ChangeStack();
+}
+
+#if USE_MP
+/**
+ * \brief Start an AP
+ */
+void MP_StartAP(int CPU)
+{
+ Log_Log("Proc", "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)&APWait - (KERNEL_BASE|0xFFFF0);
+ *(Uint16*)(KERNEL_BASE|0x469) = 0xFFFF;
+ 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 ++;
+}
+
+void MP_SendIPIVector(int CPU, Uint8 Vector)
+{
+ MP_SendIPI(gaCPUs[CPU].APICID, Vector, 0);
+}
+
+/**
+ * \brief Send an Inter-Processor Interrupt
+ * \param APICID Processor's Local APIC ID
+ * \param Vector Argument of some kind
+ * \param DeliveryMode Type of signal
+ * \note 3A 10.5 "APIC/Handling Local Interrupts"
+ */
+void MP_SendIPI(Uint8 APICID, int Vector, int DeliveryMode)
+{
+ Uint32 val;
+
+ // Hi
+ val = (Uint)APICID << 24;
+// 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", &gpMP_LocalAPIC->ICR[0], val);
+ gpMP_LocalAPIC->ICR[0].Val = val;
+}
+#endif
+
+void Proc_IdleThread(void *Ptr)
+{
+ tCPU *cpu = &gaCPUs[GetCPUNum()];
+ cpu->Current->ThreadName = strdup("Idle Thread");
+ Threads_SetPriority( cpu->Current, -1 ); // Never called randomly
+ cpu->Current->Quantum = 1; // 1 slice quantum
+ for(;;) {
+ __asm__ __volatile__ ("sti"); // Make sure interrupts are enabled
+ __asm__ __volatile__ ("hlt"); // Make sure interrupts are enabled
+ Proc_Reschedule();
+ }
+}
+
+/**
+ * \fn void Proc_Start(void)
+ * \brief Start process scheduler
+ */
+void Proc_Start(void)
+{
+ int tid;
+ #if USE_MP
+ int i;
+ #endif
- #if 1
- // Create Idle Task
- if(Proc_Clone(0, 0) == 0)
+ #if USE_MP
+ // Start APs
+ for( i = 0; i < giNumCPUs; i ++ )
{
- gCurrentThread->ThreadName = "Idle Thread";
- Proc_SetTickets(0); // Never called randomly
- gCurrentThread->Quantum = 1; // 1 slice quantum
- for(;;) __asm__ __volatile__ ("hlt"); // Just yeilds
+ if(i) gaCPUs[i].Current = NULL;
+
+ // Create Idle Task
+ tid = Proc_NewKThread(Proc_IdleThread, &gaCPUs[i]);
+
+ // Start the AP
+ if( i != giProc_BootProcessorID ) {
+ MP_StartAP( i );
+ }
}
- #endif
+ // BSP still should run the current task
+ gaCPUs[0].Current = &gThreadZero;
+
+ // Start interrupts and wait for APs to come up
+ Log_Debug("Proc", "Waiting for APs to come up");
+ __asm__ __volatile__ ("sti");
+ while( giNumInitingCPUs ) __asm__ __volatile__ ("hlt");
+ #else
+ // Create Idle Task
+ tid = Proc_NewKThread(Proc_IdleThread, &gaCPUs[0]);
+// gaCPUs[0].IdleThread = Threads_GetThread(tid);
+
+ // Set current task
+ gaCPUs[0].Current = &gThreadZero;
+
// Start Interrupts (and hence scheduler)
__asm__ __volatile__("sti");
+ #endif
+ MM_FinishVirtualInit();
}
/**
- * \fn void Proc_ChangeStack()
+ * \fn tThread *Proc_GetCurThread(void)
+ * \brief Gets the current thread
+ */
+tThread *Proc_GetCurThread(void)
+{
+ #if USE_MP
+ return gaCPUs[ GetCPUNum() ].Current;
+ #else
+ return gaCPUs[ 0 ].Current;
+ #endif
+}
+
+/**
+ * \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;
return;
}
- curBase = gCurrentThread->KernelStack;
+ curBase = (Uint)&Kernel_Stack_Top;
LOG("curBase = 0x%x, newBase = 0x%x", curBase, newBase);
*(Uint*)tmpEbp += newBase - curBase;
}
- gCurrentThread->KernelStack = newBase;
+ Proc_GetCurThread()->KernelStack = newBase;
__asm__ __volatile__ ("mov %0, %%esp"::"r"(esp));
__asm__ __volatile__ ("mov %0, %%ebp"::"r"(ebp));
}
+void Proc_ClearThread(tThread *Thread)
+{
+ MM_ClearSpace(Thread->MemState.CR3);
+ if(Thread->SavedState.SSE) {
+ free(Thread->SavedState.SSE);
+ Thread->SavedState.SSE = NULL;
+ }
+}
+
+int Proc_NewKThread(void (*Fcn)(void*), void *Data)
+{
+ Uint esp;
+ tThread *newThread, *cur;
+
+ cur = Proc_GetCurThread();
+ newThread = Threads_CloneTCB(0);
+ if(!newThread) return -1;
+
+ // Set CR3
+ MM_RefPhys( cur->MemState.CR3 );
+ newThread->MemState.CR3 = cur->MemState.CR3;
+
+ // Create new KStack
+ newThread->KernelStack = MM_NewKStack();
+ // Check for errors
+ if(newThread->KernelStack == 0) {
+ free(newThread);
+ return -1;
+ }
+
+ esp = newThread->KernelStack;
+ *(Uint*)(esp-=4) = (Uint)Data; // Data (shadowed)
+ *(Uint*)(esp-=4) = 1; // Number of params
+ *(Uint*)(esp-=4) = (Uint)Fcn; // Function to call
+ *(Uint*)(esp-=4) = (Uint)newThread; // Thread ID
+
+ newThread->SavedState.ESP = esp;
+ newThread->SavedState.EIP = (Uint)&NewTaskHeader;
+ newThread->SavedState.SSE = NULL;
+// Log("New (KThread) %p, esp = %p", newThread->SavedState.EIP, newThread->SavedState.ESP);
+
+// MAGIC_BREAK();
+ Threads_AddActive(newThread);
+
+ return newThread->TID;
+}
+
/**
* \fn int Proc_Clone(Uint *Err, Uint Flags)
* \brief Clone the current process
*/
-int Proc_Clone(Uint *Err, Uint Flags)
+int Proc_Clone(Uint Flags)
{
tThread *newThread;
- Uint eip, esp, ebp;
-
- __asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
- __asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
-
- // Create new thread structure
- newThread = malloc( sizeof(tThread) );
- if(!newThread) {
- Warning("Proc_Clone - Out of memory when creating thread\n");
- *Err = -ENOMEM;
- return -1;
- }
- // Base new thread on old
- memcpy(newThread, gCurrentThread, sizeof(tThread));
- // Initialise Memory Space (New Addr space or kernel stack)
- if(Flags & CLONE_VM) {
- newThread->TGID = newThread->TID;
- newThread->CR3 = MM_Clone();
- } else {
- Uint tmpEbp, oldEsp = esp;
-
- // Create new KStack
- newThread->KernelStack = MM_NewKStack();
- // Check for errors
- if(newThread->KernelStack == 0) {
- free(newThread);
- return -1;
- }
+ tThread *cur = Proc_GetCurThread();
+ Uint eip;
- // Get ESP as a used size
- esp = gCurrentThread->KernelStack - esp;
- // Copy used stack
- memcpy( (void*)(newThread->KernelStack - esp), (void*)(gCurrentThread->KernelStack - esp), esp );
- // Get ESP as an offset in the new stack
- esp = newThread->KernelStack - esp;
- // Adjust EBP
- ebp = newThread->KernelStack - (gCurrentThread->KernelStack - ebp);
-
- // Repair EBPs & Stack Addresses
- // Catches arguments also, but may trash stack-address-like values
- for(tmpEbp = esp; tmpEbp < newThread->KernelStack; tmpEbp += 4)
- {
- if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < gCurrentThread->KernelStack)
- *(Uint*)tmpEbp += newThread->KernelStack - gCurrentThread->KernelStack;
- }
+ // Sanity, please
+ if( !(Flags & CLONE_VM) ) {
+ Log_Error("Proc", "Proc_Clone: Don't leave CLONE_VM unset, use Proc_NewKThread instead");
+ return -1;
}
+
+ // New thread
+ newThread = Threads_CloneTCB(Flags);
+ if(!newThread) return -1;
- // Set Pointer, Spinlock and TID
- newThread->Next = NULL;
- newThread->IsLocked = 0;
- newThread->TID = giNextTID++;
+ newThread->KernelStack = cur->KernelStack;
- // Clear message list (messages are not inherited)
- newThread->Messages = NULL;
- newThread->LastMessage = NULL;
-
- // Set remaining (sheduler expects remaining to be correct)
- newThread->Remaining = newThread->Quantum;
-
- // Save core machine state
- newThread->ESP = esp;
- newThread->EBP = ebp;
- eip = GetEIP();
- if(eip == SWITCH_MAGIC) {
- outb(0x20, 0x20); // ACK Timer and return as child
+ // Clone state
+ eip = Proc_CloneInt(&newThread->SavedState.ESP, &newThread->MemState.CR3);
+ if( eip == 0 ) {
+ // ACK the interrupt
return 0;
}
+ newThread->SavedState.EIP = eip;
+ newThread->SavedState.SSE = NULL;
+ newThread->SavedState.bSSEModified = 0;
- // Set EIP as parent
- newThread->EIP = eip;
-
- //Log(" Proc_Clone: giTimestamp = %i.%07i", (Uint)giTimestamp, (Uint)giPartMiliseconds/214);
-
- // Lock list and add to active
- LOCK( &giThreadListLock );
- newThread->Next = gActiveThreads;
- gActiveThreads = newThread;
- giNumActiveThreads ++;
- giTotalTickets += newThread->NumTickets;
- RELEASE( &giThreadListLock );
-
+ // Check for errors
+ if( newThread->MemState.CR3 == 0 ) {
+ Log_Error("Proc", "Proc_Clone: MM_Clone failed");
+ Threads_Delete(newThread);
+ return -1;
+ }
+
+ // Add the new thread to the run queue
+ Threads_AddActive(newThread);
return newThread->TID;
}
/**
- * \fn void Proc_SetThreadName()
- * \brief Sets the thread's name
+ * \fn int Proc_SpawnWorker(void)
+ * \brief Spawns a new worker thread
*/
-void Proc_SetThreadName(char *NewName)
+int Proc_SpawnWorker(void (*Fcn)(void*), void *Data)
{
- if( (Uint)CUR_THREAD->ThreadName > 0xC0400000 )
- free( CUR_THREAD->ThreadName );
- CUR_THREAD->ThreadName = malloc(strlen(NewName)+1);
- strcpy(CUR_THREAD->ThreadName, NewName);
+ tThread *new;
+ Uint stack_contents[4];
+
+ // Create new thread
+ new = Threads_CloneThreadZero();
+ if(!new) {
+ Warning("Proc_SpawnWorker - Out of heap space!\n");
+ return -1;
+ }
+
+ // Create the stack contents
+ stack_contents[3] = (Uint)Data;
+ stack_contents[2] = 1;
+ stack_contents[1] = (Uint)Fcn;
+ stack_contents[0] = (Uint)new;
+
+ // Create a new worker stack (in PID0's address space)
+ new->KernelStack = MM_NewWorkerStack(stack_contents, sizeof(stack_contents));
+
+ // Save core machine state
+ new->SavedState.ESP = new->KernelStack - sizeof(stack_contents);
+ new->SavedState.EIP = (Uint)NewTaskHeader;
+ new->SavedState.SSE = NULL;
+ new->SavedState.bSSEModified = 0;
+
+ // Mark as active
+ new->Status = THREAD_STAT_PREINIT;
+ 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;
if(i != -1) return 0;
// Allocate Stack - Allocate incrementally to clean up MM_Dump output
- for( i = 0; i < USER_STACK_SZ/4069; i++ )
- MM_Allocate( base + (i<<12) );
+ for( i = 0; i < USER_STACK_SZ/0x1000; i++ )
+ {
+ if( !MM_Allocate( base + (i<<12) ) )
+ {
+ Warning("OOM: Proc_MakeUserStack");
+ return 0;
+ }
+ }
return base + USER_STACK_SZ;
}
-
-/**
- * \fn void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, char **ArgV, char **EnvP, int DataSize)
- * \brief Starts a user task
- */
-void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
+void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, char **ArgV, int DataSize)
{
- Uint *stack = (void*)Proc_MakeUserStack();
+ Uint *stack;
int i;
- Uint delta;
+ char **envp = NULL;
Uint16 ss, cs;
- LOG("stack = 0x%x", stack);
-
- // Copy Arguments
- stack = (void*)( (Uint)stack - DataSize );
+ // Copy data to the user stack and free original buffer
+ stack = (void*)Proc_MakeUserStack();
+ stack -= DataSize/sizeof(*stack);
memcpy( stack, ArgV, DataSize );
+ free(ArgV);
// 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;
+ if( DataSize )
+ {
+ Uint delta = (Uint)stack - (Uint)ArgV;
+ ArgV = (char**)stack;
+ for( i = 0; ArgV[i]; i++ ) ArgV[i] += delta;
+ envp = &ArgV[i+1];
+ for( i = 0; envp[i]; i++ ) envp[i] += delta;
+ }
// User Mode Segments
ss = 0x23; cs = 0x1B;
// Arguments
- *--stack = (Uint)EnvP;
+ *--stack = (Uint)envp;
*--stack = (Uint)ArgV;
*--stack = (Uint)ArgC;
- while(*Bases)
- *--stack = *Bases++;
- *--stack = 0; // Return Address
- delta = (Uint)stack; // Reuse delta to save SP
-
- *--stack = ss; //Stack Segment
- *--stack = delta; //Stack Pointer
- *--stack = 0x0202; //EFLAGS (Resvd (0x2) and IF (0x20))
- *--stack = cs; //Code Segment
- *--stack = Entrypoint; //EIP
+ *--stack = Base;
+
+ Proc_StartProcess(ss, (Uint)stack, 0x202, cs, Entrypoint);
+}
+
+void Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP)
+{
+ Uint *stack = (void*)Stack;
+ *--stack = SS; //Stack Segment
+ *--stack = Stack; //Stack Pointer
+ *--stack = Flags; //EFLAGS (Resvd (0x2) and IF (0x20))
+ *--stack = CS; //Code Segment
+ *--stack = IP; //EIP
//PUSHAD
*--stack = 0xAAAAAAAA; // eax
*--stack = 0xCCCCCCCC; // ecx
*--stack = 0x51515151; // esi
*--stack = 0xB4B4B4B4; // ebp
//Individual PUSHs
- *--stack = ss; // ds
- *--stack = ss; // es
- *--stack = ss; // fs
- *--stack = ss; // gs
+ *--stack = SS; // ds
+ *--stack = SS; // es
+ *--stack = SS; // fs
+ *--stack = SS; // gs
__asm__ __volatile__ (
"mov %%eax,%%esp;\n\t" // Set stack pointer
for(;;);
}
-/**
- * \fn void Proc_Exit()
- * \brief Kill the current process
- */
-void Proc_Exit()
-{
- tThread *thread;
- tMsg *msg;
-
- ///\note Double lock is needed due to overlap of locks
-
- // Lock thread (stop us recieving messages)
- LOCK( &gCurrentThread->IsLocked );
-
- // Lock thread list
- LOCK( &giThreadListLock );
-
- // Get previous thread on list
- thread = Proc_int_GetPrevThread( &gActiveThreads, gCurrentThread );
- if(!thread) {
- Warning("Proc_Exit - Current thread is not on the active queue");
- return;
- }
-
- // Clear Message Queue
- while( gCurrentThread->Messages )
- {
- msg = gCurrentThread->Messages->Next;
- free( gCurrentThread->Messages );
- gCurrentThread->Messages = msg;
- }
-
- gCurrentThread->Remaining = 0; // Clear Remaining Quantum
- gCurrentThread->Quantum = 0; // Clear Quantum to indicate dead thread
- thread->Next = gCurrentThread->Next; // Remove from active
-
- // Add to delete queue
- if(gDeleteThreads) {
- gCurrentThread->Next = gDeleteThreads;
- gDeleteThreads = gCurrentThread;
- } else {
- gCurrentThread->Next = NULL;
- gDeleteThreads = gCurrentThread;
- }
-
- giNumActiveThreads --;
- giTotalTickets -= gCurrentThread->NumTickets;
-
- // Mark thread as sleeping
- gCurrentThread->Status = THREAD_STAT_DEAD;
-
- // Release spinlocks
- RELEASE( &gCurrentThread->IsLocked ); // Released first so that it IS released
- RELEASE( &giThreadListLock );
- __asm__ __volatile__ ("hlt");
-}
-
-/**
- * \fn void Proc_Yield()
- * \brief Yield remainder of timeslice
- */
-void Proc_Yield()
-{
- gCurrentThread->Quantum = 0;
- __asm__ __volatile__ ("hlt");
-}
-
-/**
- * \fn void Proc_Sleep()
- * \brief Take the current process off the run queue
- */
-void Proc_Sleep()
-{
- tThread *thread;
-
- //Log("Proc_Sleep: %i going to sleep", gCurrentThread->TID);
-
- // Acquire Spinlock
- LOCK( &giThreadListLock );
-
- // Get thread before current thread
- thread = Proc_int_GetPrevThread( &gActiveThreads, gCurrentThread );
- if(!thread) {
- Warning("Proc_Sleep - Current thread is not on the active queue");
- return;
- }
-
- // Don't sleep if there is a message waiting
- if( gCurrentThread->Messages ) {
- RELEASE( &giThreadListLock );
- return;
- }
-
- // Unset remaining timeslices (force a task switch on timer fire)
- gCurrentThread->Remaining = 0;
-
- // Remove from active list
- thread->Next = gCurrentThread->Next;
-
- // Add to Sleeping List (at the top)
- gCurrentThread->Next = gSleepingThreads;
- gSleepingThreads = gCurrentThread;
-
- // Reduce the active count & ticket count
- giNumActiveThreads --;
- giTotalTickets -= gCurrentThread->NumTickets;
-
- // Mark thread as sleeping
- gCurrentThread->Status = THREAD_STAT_SLEEPING;
-
- // Release Spinlock
- RELEASE( &giThreadListLock );
-
- __asm__ __volatile__ ("hlt");
-}
-
-/**
- * \fn void Thread_Wake( tThread *Thread )
- * \brief Wakes a sleeping/waiting thread up
- */
-void Thread_Wake(tThread *Thread)
-{
- tThread *prev;
- switch(Thread->Status)
- {
- case THREAD_STAT_ACTIVE: break;
- case THREAD_STAT_SLEEPING:
- LOCK( &giThreadListLock );
- prev = Proc_int_GetPrevThread(&gSleepingThreads, Thread);
- prev->Next = Thread->Next; // Remove from sleeping queue
- Thread->Next = gActiveThreads; // Add to active queue
- gActiveThreads = Thread;
- Thread->Status = THREAD_STAT_ACTIVE;
- RELEASE( &giThreadListLock );
- break;
- case THREAD_STAT_WAITING:
- Warning("Thread_Wake - Waiting threads are not currently supported");
- break;
- case THREAD_STAT_DEAD:
- Warning("Thread_Wake - Attempt to wake dead thread (%i)", Thread->TID);
- break;
- default:
- Warning("Thread_Wake - Unknown process status (%i)\n", Thread->Status);
- break;
- }
-}
-
/**
* \fn int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
* \brief Demotes a process to a lower permission level
* \param Err Pointer to user's errno
+ * \param Dest New Permission Level
+ * \param Regs Pointer to user's register structure
*/
int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
{
}
/**
- * \fn void Proc_SetTickets(int Num)
- * \brief Sets the 'priority' of a task
+ * \brief Calls a signal handler in user mode
+ * \note Used for signals
*/
-void Proc_SetTickets(int Num)
+void Proc_CallFaultHandler(tThread *Thread)
{
- if(Num < 0) return;
- if(Num > MAX_TICKETS) Num = MAX_TICKETS;
-
- LOCK( &giThreadListLock );
- giTotalTickets -= gCurrentThread->NumTickets;
- gCurrentThread->NumTickets = Num;
- giTotalTickets += Num;
- //LOG("giTotalTickets = %i", giTotalTickets);
- RELEASE( &giThreadListLock );
+ // Rewinds the stack and calls the user function
+ // Never returns
+ Proc_ReturnToUser( Thread->FaultHandler, Thread->CurFaultNum, Thread->KernelStack );
+ for(;;);
}
-/**
- * \fn tThread *Proc_GetThread(Uint TID)
- * \brief Gets a thread given its TID
- */
-tThread *Proc_GetThread(Uint TID)
+void Proc_DumpThreadCPUState(tThread *Thread)
{
- tThread *thread;
+ if( Thread->CurCPU > -1 )
+ {
+ int maxBacktraceDistance = 6;
+ tRegs *regs = NULL;
+ Uint32 *stack;
+
+ if( Thread->CurCPU != GetCPUNum() ) {
+ Log(" Currently running");
+ return ;
+ }
+
+ // Backtrace to find the IRQ entrypoint
+ // - This will usually only be called by an IRQ, so this should
+ // work
+ __asm__ __volatile__ ("mov %%ebp, %0" : "=r" (stack));
+ while( maxBacktraceDistance -- )
+ {
+ // [ebp] = oldEbp
+ // [ebp+4] = retaddr
+
+ if( stack[1] == (tVAddr)&IRQCommon_handled ) {
+ regs = (void*)stack[2];
+ break;
+ }
+
+ stack = (void*)stack[0];
+ }
+
+ if( !regs ) {
+ Log(" Unable to find IRQ Entry");
+ return ;
+ }
+
+ Log(" at %04x:%08x", regs->cs, regs->eip);
+ return ;
+ }
+
+ tVAddr diffFromScheduler = Thread->SavedState.EIP - (tVAddr)SwitchTasks;
+ tVAddr diffFromClone = Thread->SavedState.EIP - (tVAddr)Proc_CloneInt;
+ tVAddr diffFromSpawn = Thread->SavedState.EIP - (tVAddr)NewTaskHeader;
+
+ if( diffFromClone > 0 && diffFromClone < 40 ) // When I last checked, .newTask was at .+27
+ {
+ Log(" Creating process");
+ return ;
+ }
- // Search Active List
- for(thread = gActiveThreads;
- thread;
- thread = thread->Next)
+ if( diffFromSpawn == 0 )
{
- if(thread->TID == TID)
- return thread;
+ Log(" Creating thread");
+ return ;
}
- // Search Sleeping List
- for(thread = gSleepingThreads;
- thread;
- thread = thread->Next)
+ if( diffFromScheduler > 0 && diffFromScheduler < 128 ) // When I last checked, GetEIP was at .+0x30
{
- if(thread->TID == TID)
- return thread;
+ // Scheduled out
+ Log(" At %04x:%08x", Thread->SavedState.UserCS, Thread->SavedState.UserEIP);
+ return ;
}
- return NULL;
+ Log(" Just created (unknown %p)", Thread->SavedState.EIP);
}
-/**
- * \fn static tThread *Proc_int_GetPrevThread(tThread *List, tThread *Thread)
- * \brief Gets the previous entry in a thead linked list
- */
-static tThread *Proc_int_GetPrevThread(tThread **List, tThread *Thread)
+void Proc_Reschedule(void)
{
- tThread *ret;
- // First Entry
- if(*List == Thread) {
- return (tThread*)List;
- } else {
- for(ret = *List;
- ret->Next && ret->Next != Thread;
- ret = ret->Next
+ tThread *nextthread, *curthread;
+ int cpu = GetCPUNum();
+
+ // TODO: Wait for the lock?
+ if(IS_LOCKED(&glThreadListLock)) return;
+
+ curthread = Proc_GetCurThread();
+
+ nextthread = Threads_GetNextToRun(cpu, curthread);
+
+ if(!nextthread || nextthread == curthread)
+ return ;
+
+ #if DEBUG_TRACE_SWITCH
+ // HACK: Ignores switches to the idle threads
+ if( nextthread->TID == 0 || nextthread->TID > giNumCPUs )
+ {
+ LogF("\nSwitching CPU %i to %p (%i %s) - CR3 = 0x%x, EIP = %p, ESP = %p\n",
+ GetCPUNum(),
+ nextthread, nextthread->TID, nextthread->ThreadName,
+ nextthread->MemState.CR3,
+ nextthread->SavedState.EIP,
+ nextthread->SavedState.ESP
);
- // Error if the thread is not on the list
- if(!ret->Next || ret->Next != Thread) {
- return NULL;
- }
}
- return ret;
-}
+ #endif
-/**
- * \fn void Proc_DumpThreads()
- * \brief Dums a list of currently running threads
- */
-void Proc_DumpThreads()
-{
- tThread *thread;
-
- Log("Active Threads:");
- for(thread=gActiveThreads;thread;thread=thread->Next)
+ // Update CPU state
+ gaCPUs[cpu].Current = nextthread;
+ gTSSs[cpu].ESP0 = nextthread->KernelStack-4;
+ __asm__ __volatile__("mov %0, %%db0\n\t" : : "r"(nextthread) );
+
+ // Save FPU/MMX/XMM/SSE state
+ if( curthread && curthread->SavedState.SSE )
{
- Log(" %i (%i) - %s", thread->TID, thread->TGID, thread->ThreadName);
- Log(" %i Tickets, Quantum %i", thread->NumTickets, thread->Quantum);
- Log(" CR3 0x%x, KStack 0x%x", thread->CR3, thread->KernelStack);
+ Proc_SaveSSE( ((Uint)curthread->SavedState.SSE + 0xF) & ~0xF );
+ curthread->SavedState.bSSEModified = 0;
+ Proc_DisableSSE();
}
- Log("Sleeping Threads:");
- for(thread=gSleepingThreads;thread;thread=thread->Next)
+
+ if( curthread )
{
- Log(" %i (%i) - %s", thread->TID, thread->TGID, thread->ThreadName);
- Log(" %i Tickets, Quantum %i", thread->NumTickets, thread->Quantum);
- Log(" CR3 0x%x, KStack 0x%x", thread->CR3, thread->KernelStack);
+ SwitchTasks(
+ nextthread->SavedState.ESP, &curthread->SavedState.ESP,
+ nextthread->SavedState.EIP, &curthread->SavedState.EIP,
+ nextthread->MemState.CR3
+ );
}
+ else
+ {
+ SwitchTasks(
+ nextthread->SavedState.ESP, 0,
+ nextthread->SavedState.EIP, 0,
+ nextthread->MemState.CR3
+ );
+ }
+
+ return ;
}
/**
*/
void Proc_Scheduler(int CPU)
{
- Uint esp, ebp, eip;
- Uint number, ticket;
+#if 0
tThread *thread;
// If the spinlock is set, let it complete
- if(giThreadListLock) return;
+ if(IS_LOCKED(&glThreadListLock)) 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\n");
- __asm__ __volatile__ ("hlt");
- return;
- }
-
- // Reduce remaining quantum
- if(gCurrentThread->Remaining--) return;
- // Reset quantum for next call
- gCurrentThread->Remaining = gCurrentThread->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
+ // Get current thread
+ thread = gaCPUs[CPU].Current;
- // Save machine state
- gCurrentThread->ESP = esp;
- gCurrentThread->EBP = ebp;
- gCurrentThread->EIP = eip;
-
- // Special case: 1 thread
- if(giNumActiveThreads == 1)
- {
- // Check if a switch is needed (NumActive can be 1 after a sleep)
- if(gActiveThreads == gCurrentThread) return;
- // Switch processes
- gCurrentThread = gActiveThreads;
- goto performSwitch;
- }
-
- // Get the ticket number
- ticket = number = rand() % giTotalTickets;
-
- // Find the next thread
- for(thread=gActiveThreads;thread;thread=thread->Next)
+ if( thread )
{
- if(thread->NumTickets > number) break;
- number -= thread->NumTickets;
- }
-
- // Error Check
- if(thread == NULL)
- {
- number = 0;
- for(thread=gActiveThreads;thread;thread=thread->Next)
- number += thread->NumTickets;
- Panic("Bookeeping Failed - giTotalTicketCount (%i) != true count (%i)",
- giTotalTickets, number);
+ tRegs *regs;
+ Uint ebp;
+ // Reduce remaining quantum and continue timeslice if non-zero
+ if( thread->Remaining-- )
+ return;
+ // Reset quantum for next call
+ thread->Remaining = thread->Quantum;
+
+ // TODO: Make this more stable somehow
+ __asm__ __volatile__("mov %%ebp, %0" : "=r" (ebp));
+ regs = (tRegs*)(ebp+(2+2)*4); // EBP,Ret + CPU,CurThread
+ thread->SavedState.UserCS = regs->cs;
+ thread->SavedState.UserEIP = regs->eip;
+
+ if(thread->bInstrTrace) {
+ regs->eflags |= 0x100; // Set TF
+ Log("%p De-scheduled", thread);
+ }
+ else
+ regs->eflags &= ~0x100; // Clear TF
}
-
- // Set current thread
- gCurrentThread = thread;
-
- // Update Kernel Stack pointer
- gTSSs[CPU].ESP0 = thread->KernelStack;
-
-performSwitch:
- // Set address space
- //MM_SetCR3( gCurrentThread->CR3 );
- __asm__ __volatile__ ("mov %0, %%cr3"::"a"(gCurrentThread->CR3));
- // Switch threads
- __asm__ __volatile__ (
- "mov %1, %%esp\n\t"
- "mov %2, %%ebp\n\t"
- "jmp *%3" : :
- "a"(SWITCH_MAGIC), "b"(gCurrentThread->ESP),
- "d"(gCurrentThread->EBP), "c"(gCurrentThread->EIP));
- for(;;); // Shouldn't reach here
-}
-// --- Process Structure Access Functions ---
-int Proc_GetPID()
-{
- return gCurrentThread->TGID;
-}
-int Proc_GetTID()
-{
- return gCurrentThread->TID;
-}
-int Proc_GetUID()
-{
- return gCurrentThread->UID;
-}
-int Proc_GetGID()
-{
- return gCurrentThread->GID;
+ // TODO: Ack timer?
+ #if USE_MP
+ if( GetCPUNum() )
+ gpMP_LocalAPIC->EOI.Val = 0;
+ else
+ #endif
+ outb(0x20, 0x20);
+ __asm__ __volatile__ ("sti");
+ Proc_Reschedule();
+#endif
}
+
+// === EXPORTS ===
+EXPORT(Proc_SpawnWorker);