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);
24 tTID Proc_NewKThread(void (*Fnc)(void*), void *Ptr);
27 tThread *gpCurrentThread = &gThreadZero;
28 tThread *gpIdleThread = NULL;
31 void ArchThreads_Init(void)
33 gThreadZero.MemState.Base = (tPAddr)&kernel_table0 - KERNEL_BASE;
36 void Proc_IdleThread(void *unused)
38 Threads_SetPriority(gpIdleThread, -1);
41 __asm__ __volatile__ ("wfi");
49 tid = Proc_NewKThread( Proc_IdleThread, NULL );
50 gpIdleThread = Threads_GetThread(tid);
51 gpIdleThread->ThreadName = (char*)"Idle Thread";
59 tThread *Proc_GetCurThread(void)
61 return gpCurrentThread;
64 void Proc_StartUser(Uint Entrypoint, Uint Base, int ArgC, char **ArgV, int DataSize)
71 Log_Debug("Proc", "Proc_StartUser: (Entrypoint=%p, Base=%p, ArgC=%i, ArgV=%p, DataSize=0x%x)",
72 Entrypoint, Base, ArgC, ArgV, DataSize);
74 // Write data to the user's stack
75 usr_sp = (void*)MM_NewUserStack();
76 usr_sp -= (DataSize+3)/4;
77 memcpy(usr_sp, ArgV, DataSize);
80 // Adjust user's copy of the arguments
81 delta = (tVAddr)usr_sp - (tVAddr)ArgV;
82 Log("delta = %x", delta);
84 for(i = 0; ArgV[i]; i ++) ArgV[i] += delta;
86 for(i = 0; envp[i]; i ++) envp[i] += delta;
87 Log("envp = %p", envp);
89 *--usr_sp = (Uint32)envp;
90 *--usr_sp = (Uint32)ArgV;
91 *--usr_sp = (Uint32)ArgC;
95 Log_Debug("Proc", "Proc_int_DropToUser(%p, %p)", Entrypoint, usr_sp);
96 Proc_int_DropToUser(Entrypoint, (Uint32)usr_sp);
99 tTID Proc_Clone(Uint Flags)
104 new = Threads_CloneTCB(Flags);
107 // Actual clone magic
108 pc = Proc_CloneInt(&sp, &mem);
110 Log("Proc_Clone: In child");
114 new->SavedState.IP = pc;
115 new->SavedState.SP = sp;
116 new->MemState.Base = mem;
118 Threads_AddActive(new);
123 tTID Proc_SpawnWorker( void (*Fnc)(void*), void *Ptr )
128 new = Threads_CloneThreadZero();
130 if(new->ThreadName) free(new->ThreadName);
131 new->ThreadName = NULL;
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 tTID Proc_NewKThread( void (*Fnc)(void*), void *Ptr )
160 new = Threads_CloneTCB(0);
162 free(new->ThreadName);
163 new->ThreadName = NULL;
165 // TODO: Non-shared stack
166 new->KernelStack = MM_NewKStack(1);
167 if(!new->KernelStack) {
168 // TODO: Delete thread
169 Log_Error("Proc", "Unable to allocate kernel stack");
173 sp = new->KernelStack;
175 *(Uint32*)(sp -= 4) = (Uint)Ptr;
176 *(Uint32*)(sp -= 4) = 1;
177 *(Uint32*)(sp -= 4) = (Uint)Fnc;
178 *(Uint32*)(sp -= 4) = (Uint)new;
180 new->SavedState.SP = sp;
181 new->SavedState.IP = (Uint)KernelThreadHeader;
183 Threads_AddActive(new);
188 void Proc_CallFaultHandler(tThread *Thread)
193 void Proc_Reschedule(void)
197 cur = gpCurrentThread;
199 next = Threads_GetNextToRun(0, cur);
200 if(!next) next = gpIdleThread;
201 if(!next || next == cur) return;
203 Log("Switching to %p (%i %s) IP=%p SP=%p TTBR0=%p",
204 next, next->TID, next->ThreadName,
205 next->SavedState.IP, next->SavedState.SP, next->MemState.Base
207 Log("Requested by %p", __builtin_return_address(0));
209 gpCurrentThread = next;
212 next->SavedState.SP, &cur->SavedState.SP,
213 next->SavedState.IP, &cur->SavedState.IP,
219 void Proc_DumpThreadCPUState(tThread *Thread)