3 * - By John Hodge (thePowersGang)
6 * - ARM7 Process Switching
9 #include <threads_int.h>
13 extern tThread gThreadZero;
14 extern void SwitchTask(Uint32 NewSP, Uint32 *OldSP, Uint32 NewIP, Uint32 *OldIP, Uint32 MemPtr);
15 extern void KernelThreadHeader(void); // Actually takes args on stack
16 extern Uint32 Proc_CloneInt(Uint32 *SP, Uint32 *MemPtr);
17 extern tVAddr MM_NewKStack(int bGlobal); // TODO: Move out into a header
20 void Proc_IdleThread(void *unused);
21 tTID Proc_NewKThread(void (*Fnc)(void*), void *Ptr);
24 tThread *gpCurrentThread = &gThreadZero;
25 tThread *gpIdleThread = NULL;
28 void ArchThreads_Init(void)
32 void Proc_IdleThread(void *unused)
34 Threads_SetPriority(gpIdleThread, -1);
37 __asm__ __volatile__ ("wfi");
45 tid = Proc_NewKThread( Proc_IdleThread, NULL );
46 gpIdleThread = Threads_GetThread(tid);
47 gpIdleThread->ThreadName = (char*)"Idle Thread";
55 tThread *Proc_GetCurThread(void)
57 return gpCurrentThread;
60 void Proc_StartUser(Uint Entrypoint, Uint *Bases, int ArgC, char **ArgV, char **EnvP, int DataSize)
62 Log_Debug("Proc", "Proc_StartUser: (Entrypoint=%p, Bases=%p, ArgC=%i, ...)",
63 Entrypoint, Bases, ArgC);
66 tTID Proc_Clone(Uint Flags)
71 new = Threads_CloneTCB(Flags);
75 pc = Proc_CloneInt(&sp, &mem);
77 Log("Proc_Clone: In child");
81 new->SavedState.IP = pc;
82 new->SavedState.SP = sp;
83 new->MemState.Base = mem;
85 Threads_AddActive(new);
90 tTID Proc_SpawnWorker( void (*Fnc)(void*), void *Ptr )
95 new = Threads_CloneThreadZero();
97 free(new->ThreadName);
98 new->ThreadName = NULL;
100 new->KernelStack = MM_NewKStack(1);
101 if(!new->KernelStack) {
102 // TODO: Delete thread
103 Log_Error("Proc", "Unable to allocate kernel stack");
107 sp = new->KernelStack;
109 *(Uint32*)(sp -= 4) = (Uint)Ptr;
110 *(Uint32*)(sp -= 4) = 1;
111 *(Uint32*)(sp -= 4) = (Uint)Fnc;
112 *(Uint32*)(sp -= 4) = (Uint)new;
114 new->SavedState.SP = sp;
115 new->SavedState.IP = (Uint)KernelThreadHeader;
117 Threads_AddActive(new);
122 tTID Proc_NewKThread( void (*Fnc)(void*), void *Ptr )
127 new = Threads_CloneTCB(0);
129 free(new->ThreadName);
130 new->ThreadName = NULL;
132 // TODO: Non-shared stack
133 new->KernelStack = MM_NewKStack(1);
134 if(!new->KernelStack) {
135 // TODO: Delete thread
136 Log_Error("Proc", "Unable to allocate kernel stack");
140 sp = new->KernelStack;
142 *(Uint32*)(sp -= 4) = (Uint)Ptr;
143 *(Uint32*)(sp -= 4) = 1;
144 *(Uint32*)(sp -= 4) = (Uint)Fnc;
145 *(Uint32*)(sp -= 4) = (Uint)new;
147 new->SavedState.SP = sp;
148 new->SavedState.IP = (Uint)KernelThreadHeader;
150 Threads_AddActive(new);
155 void Proc_CallFaultHandler(tThread *Thread)
160 void Proc_Reschedule(void)
164 cur = gpCurrentThread;
166 next = Threads_GetNextToRun(0, cur);
167 if(!next) next = gpIdleThread;
168 if(!next || next == cur) return;
170 Log("Switching to %p (%i %s)", next, next->TID, next->ThreadName);
171 Log(" IP=%p SP=%p TTBR0=%p", next->SavedState.IP, next->SavedState.SP, next->MemState.Base);
172 Log("Requested by %p", __builtin_return_address(0));
174 gpCurrentThread = next;
177 next->SavedState.SP, &cur->SavedState.SP,
178 next->SavedState.IP, &cur->SavedState.IP,
184 void Proc_DumpThreadCPUState(tThread *Thread)