# include <mp.h>
#endif
+// === FLAGS ===
+#define DEBUG_TRACE_SWITCH 0
+
// === CONSTANTS ===
#define SWITCH_MAGIC 0xFFFACE55 // There is no code in this area
#define TIMER_DIVISOR 11931 //~100Hz
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 Isr7();
// === PROTOTYPES ===
void ArchThreads_Init();
#if !USE_MP
tTSS gTSS0 = {0};
#endif
+// --- Error Recovery ---
+char gaDoubleFaultStack[1024];
+tTSS gDoubleFault_TSS = {
+ .ESP0 = (Uint)&gaDoubleFaultStack[1023],
+ .SS0 = 0x10,
+ .EIP = (Uint)Isr7
+};
// === CODE ===
/**
#if USE_MP
}
+ // 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;
+
// Initialise TSS
for(pos=0;pos<giNumCPUs;pos++)
{
#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;
+ gGDT[6+pos].LimitLow = sizeof(tTSS);
+ gGDT[6+pos].LimitHi = 0;
+ gGDT[6+pos].Access = 0x89; // Type
+ gGDT[6+pos].Flags = 0x4;
+ gGDT[6+pos].BaseLow = (Uint)&gTSSs[pos] & 0xFFFF;
+ gGDT[6+pos].BaseMid = (Uint)&gTSSs[pos] >> 16;
+ gGDT[6+pos].BaseHi = (Uint)&gTSSs[pos] >> 24;
#if USE_MP
}
for(pos=0;pos<giNumCPUs;pos++) {
#endif
- __asm__ __volatile__ ("ltr %%ax"::"a"(0x28+pos*8));
+ __asm__ __volatile__ ("ltr %%ax"::"a"(0x30+pos*8));
#if USE_MP
}
#endif
int Proc_Clone(Uint *Err, Uint Flags)
{
tThread *newThread;
+ tThread *cur = Proc_GetCurThread();
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));
+ newThread = Threads_CloneTCB(Err, Flags);
+ if(!newThread) return -1;
+
// Initialise Memory Space (New Addr space or kernel stack)
if(Flags & CLONE_VM) {
- newThread->TGID = newThread->TID;
newThread->MemState.CR3 = MM_Clone();
+ newThread->KernelStack = cur->KernelStack;
} else {
Uint tmpEbp, oldEsp = esp;
+ // Set CR3
+ newThread->MemState.CR3 = cur->MemState.CR3;
+
// Create new KStack
newThread->KernelStack = MM_NewKStack();
// Check for errors
}
// Get ESP as a used size
- esp = gCurrentThread->KernelStack - esp;
+ esp = cur->KernelStack - esp;
// Copy used stack
- memcpy( (void*)(newThread->KernelStack - esp), (void*)(gCurrentThread->KernelStack - esp), esp );
+ memcpy( (void*)(newThread->KernelStack - esp), (void*)(cur->KernelStack - esp), esp );
// Get ESP as an offset in the new stack
esp = newThread->KernelStack - esp;
// Adjust EBP
- ebp = newThread->KernelStack - (gCurrentThread->KernelStack - ebp);
+ ebp = newThread->KernelStack - (cur->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;
+ if(oldEsp < *(Uint*)tmpEbp && *(Uint*)tmpEbp < cur->KernelStack)
+ *(Uint*)tmpEbp += newThread->KernelStack - cur->KernelStack;
}
}
-
- // Set Pointer, Spinlock and TID
- newThread->Next = NULL;
- newThread->IsLocked = 0;
- newThread->TID = giNextTID++;
- newThread->PTID = gCurrentThread->TID;
-
- // 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->SavedState.ESP = esp;
newThread->SavedState.EIP = eip;
// Lock list and add to active
- LOCK( &giThreadListLock );
- newThread->Next = gActiveThreads;
- gActiveThreads = newThread;
- giNumActiveThreads ++;
- giTotalTickets += newThread->NumTickets;
- RELEASE( &giThreadListLock );
+ Threads_AddActive(newThread);
return newThread->TID;
}
+/**
+ * \fn int Proc_SpawnWorker()
+ * \brief Spawns a new worker thread
+ */
+int Proc_SpawnWorker()
+{
+ tThread *new, *cur;
+ Uint eip, esp, ebp;
+
+ cur = Proc_GetCurThread();
+
+ // Create new thread
+ new = malloc( sizeof(tThread) );
+ if(!new) {
+ Warning("Proc_SpawnWorker - Out of heap space!\n");
+ return -1;
+ }
+ memcpy(new, &gThreadZero, sizeof(tThread));
+ // Set Thread ID
+ new->TID = giNextTID++;
+ // Set kernel stack
+ new->KernelStack = MM_NewWorkerStack();
+
+ // Get ESP and EBP based in the new stack
+ __asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
+ __asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
+ esp = cur->KernelStack - (new->KernelStack - esp);
+ ebp = new->KernelStack - (cur->KernelStack - ebp);
+
+ // Save core machine state
+ new->SavedState.ESP = esp;
+ new->SavedState.EBP = ebp;
+ eip = GetEIP();
+ if(eip == SWITCH_MAGIC) {
+ outb(0x20, 0x20); // ACK Timer and return as child
+ return 0;
+ }
+
+ // Set EIP as parent
+ new->SavedState.EIP = eip;
+
+ return new->TID;
+}
+
/**
* \fn Uint Proc_MakeUserStack()
* \brief Creates a new user stack
/**
- * \fn void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, char **ArgV, char **EnvP, int DataSize)
+ * \fn void Proc_StartUser(Uint Entrypoint, Uint *Bases, 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)
* \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)
{
// Check if there is any tasks running
if(giNumActiveThreads == 0) {
- Log("No Active threads, sleeping\n");
+ Log("No Active threads, sleeping");
__asm__ __volatile__ ("hlt");
return;
}
return;
}
+ #if DEBUG_TRACE_SWITCH
+ Log("Switching to task %i, CR3 = 0x%x, EIP = %p",
+ thread->TID,
+ thread->MemState.CR3,
+ thread->SavedState.EIP
+ );
+ #endif
+
// Set current thread
gCurrentThread = thread;
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au