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 void Proc_int_DropToUser(Uint32 IP, Uint32 SP) NORETURN;
17 extern Uint32 Proc_CloneInt(Uint32 *SP, Uint32 *MemPtr);
18 extern tVAddr MM_NewKStack(int bGlobal); // TODO: Move out into a header
19 extern tVAddr MM_NewUserStack(void);
20 extern char kernel_table0[];
23 void Proc_IdleThread(void *unused);
26 tThread *gpCurrentThread = &gThreadZero;
27 tThread *gpIdleThread = NULL;
30 void ArchThreads_Init(void)
32 gThreadZero.MemState.Base = (tPAddr)&kernel_table0 - KERNEL_BASE;
35 void Proc_IdleThread(void *unused)
37 Threads_SetPriority(gpIdleThread, -1);
40 __asm__ __volatile__ ("wfi");
48 tid = Proc_NewKThread( Proc_IdleThread, NULL );
49 gpIdleThread = Threads_GetThread(tid);
50 gpIdleThread->ThreadName = (char*)"Idle Thread";
58 tThread *Proc_GetCurThread(void)
60 return gpCurrentThread;
63 void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, char **ArgV, int DataSize)
70 Log_Debug("Proc", "Proc_StartUser: (Entrypoint=%p, Base=%p, ArgC=%i, ArgV=%p, DataSize=0x%x)",
71 Entrypoint, Base, ArgC, ArgV, DataSize);
73 // Write data to the user's stack
74 usr_sp = (void*)MM_NewUserStack();
75 usr_sp -= (DataSize+3)/4;
76 memcpy(usr_sp, ArgV, DataSize);
79 // Adjust user's copy of the arguments
80 delta = (tVAddr)usr_sp - (tVAddr)ArgV;
81 Log("delta = %x", delta);
83 for(i = 0; ArgV[i]; i ++) ArgV[i] += delta;
85 for(i = 0; envp[i]; i ++) envp[i] += delta;
86 Log("envp = %p", envp);
88 *--usr_sp = (Uint32)envp;
89 *--usr_sp = (Uint32)ArgV;
90 *--usr_sp = (Uint32)ArgC;
94 Log_Debug("Proc", "Proc_int_DropToUser(%p, %p)", Entrypoint, usr_sp);
95 Proc_int_DropToUser(Entrypoint, (Uint32)usr_sp);
98 tTID Proc_Clone(Uint Flags)
103 new = Threads_CloneTCB(Flags);
106 // Actual clone magic
107 pc = Proc_CloneInt(&sp, &mem);
109 Log("Proc_Clone: In child");
113 new->SavedState.IP = pc;
114 new->SavedState.SP = sp;
115 new->MemState.Base = mem;
117 Threads_AddActive(new);
122 tTID Proc_SpawnWorker( void (*Fnc)(void*), void *Ptr )
127 new = Threads_CloneThreadZero();
129 if(new->ThreadName) free(new->ThreadName);
130 new->ThreadName = NULL;
132 new->KernelStack = MM_NewKStack(1);
133 if(!new->KernelStack) {
134 // TODO: Delete thread
135 Log_Error("Proc", "Unable to allocate kernel stack");
139 sp = new->KernelStack;
141 *(Uint32*)(sp -= 4) = (Uint)Ptr;
142 *(Uint32*)(sp -= 4) = (Uint)Fnc;
143 *(Uint32*)(sp -= 4) = (Uint)new;
145 new->SavedState.SP = sp;
146 new->SavedState.IP = (Uint)KernelThreadHeader;
148 Threads_AddActive(new);
153 tTID Proc_NewKThread( void (*Fnc)(void*), void *Ptr )
158 new = Threads_CloneTCB(0);
160 free(new->ThreadName);
161 new->ThreadName = NULL;
163 // TODO: Non-shared stack
164 new->KernelStack = MM_NewKStack(1);
165 if(!new->KernelStack) {
166 // TODO: Delete thread
167 Log_Error("Proc", "Unable to allocate kernel stack");
171 sp = new->KernelStack;
173 *(Uint32*)(sp -= 4) = (Uint)Ptr;
174 *(Uint32*)(sp -= 4) = (Uint)Fnc;
175 *(Uint32*)(sp -= 4) = (Uint)new;
177 new->SavedState.SP = sp;
178 new->SavedState.IP = (Uint)KernelThreadHeader;
180 Threads_AddActive(new);
185 void Proc_CallFaultHandler(tThread *Thread)
190 void Proc_Reschedule(void)
194 cur = gpCurrentThread;
196 next = Threads_GetNextToRun(0, cur);
197 if(!next) next = gpIdleThread;
198 if(!next || next == cur) return;
200 Log("Switching to %p (%i %s) IP=%p SP=%p TTBR0=%p",
201 next, next->TID, next->ThreadName,
202 next->SavedState.IP, next->SavedState.SP, next->MemState.Base
204 Log("Requested by %p", __builtin_return_address(0));
206 gpCurrentThread = next;
209 next->SavedState.SP, &cur->SavedState.SP,
210 next->SavedState.IP, &cur->SavedState.IP,
216 void Proc_DumpThreadCPUState(tThread *Thread)