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);
64 Log_Error("Proc", "TODO: Implement Proc_StartUser");
67 tTID Proc_Clone(Uint Flags)
72 new = Threads_CloneTCB(Flags);
76 pc = Proc_CloneInt(&sp, &mem);
78 Log("Proc_Clone: In child");
82 new->SavedState.IP = pc;
83 new->SavedState.SP = sp;
84 new->MemState.Base = mem;
86 Threads_AddActive(new);
91 tTID Proc_SpawnWorker( void (*Fnc)(void*), void *Ptr )
96 new = Threads_CloneThreadZero();
98 free(new->ThreadName);
99 new->ThreadName = NULL;
101 new->KernelStack = MM_NewKStack(1);
102 if(!new->KernelStack) {
103 // TODO: Delete thread
104 Log_Error("Proc", "Unable to allocate kernel stack");
108 sp = new->KernelStack;
110 *(Uint32*)(sp -= 4) = (Uint)Ptr;
111 *(Uint32*)(sp -= 4) = 1;
112 *(Uint32*)(sp -= 4) = (Uint)Fnc;
113 *(Uint32*)(sp -= 4) = (Uint)new;
115 new->SavedState.SP = sp;
116 new->SavedState.IP = (Uint)KernelThreadHeader;
118 Threads_AddActive(new);
123 tTID Proc_NewKThread( void (*Fnc)(void*), void *Ptr )
128 new = Threads_CloneTCB(0);
130 free(new->ThreadName);
131 new->ThreadName = NULL;
133 // TODO: Non-shared stack
134 new->KernelStack = MM_NewKStack(1);
135 if(!new->KernelStack) {
136 // TODO: Delete thread
137 Log_Error("Proc", "Unable to allocate kernel stack");
141 sp = new->KernelStack;
143 *(Uint32*)(sp -= 4) = (Uint)Ptr;
144 *(Uint32*)(sp -= 4) = 1;
145 *(Uint32*)(sp -= 4) = (Uint)Fnc;
146 *(Uint32*)(sp -= 4) = (Uint)new;
148 new->SavedState.SP = sp;
149 new->SavedState.IP = (Uint)KernelThreadHeader;
151 Threads_AddActive(new);
156 void Proc_CallFaultHandler(tThread *Thread)
161 void Proc_Reschedule(void)
165 cur = gpCurrentThread;
167 next = Threads_GetNextToRun(0, cur);
168 if(!next) next = gpIdleThread;
169 if(!next || next == cur) return;
171 Log("Switching to %p (%i %s) IP=%p SP=%p TTBR0=%p",
172 next, next->TID, next->ThreadName,
173 next->SavedState.IP, next->SavedState.SP, next->MemState.Base
175 Log("Requested by %p", __builtin_return_address(0));
177 gpCurrentThread = next;
180 next->SavedState.SP, &cur->SavedState.SP,
181 next->SavedState.IP, &cur->SavedState.IP,
187 void Proc_DumpThreadCPUState(tThread *Thread)