/*
* If the given thread has a User_Context,
* switch to its memory space.
*
* Params:
* kthread - the thread that is about to execute
* state - saved processor registers describing the state when
* the thread was interrupted
*/
void Switch_To_User_Context(struct Kernel_Thread* kthread, struct Interrupt_State* state)
{
/*
* Hint: Before executing in user mode, you will need to call
* the Set_Kernel_Stack_Pointer() and Switch_To_Address_Space()
* functions.
*/
//TODO("Switch to a new user address space, if necessary");
Set_Kernel_Stack_Pointer((ulong_t)((kthread->stackPage)+PAGE_SIZE));
// ERROR: only user thread need this function
if(Interrupts_Enabled())
Disable_Interrupts();
if (kthread->userContext != 0)
{
//Print("SuC: %d ldt: %d\n", (int)(kthread->userContext),
// (int)));
//Set_Kernel_Stack_Pointer((ulong_t)(kthread->esp));
Switch_To_Address_Space(kthread->userContext);
//Print("Switch to Address Space!\n");
//Print("jump to %d\n", (int)(kthread->userContext->entryAddr));
//Dump_Interrupt_State(state);
//KASSERT(0);
}
Enable_Interrupts();
}
/*
* If the given thread has a User_Context,
* switch to its memory space.
*
* Params:
* kthread - the thread that is about to execute
* state - saved processor registers describing the state when
* the thread was interrupted
*/
void Switch_To_User_Context(struct Kernel_Thread* kthread, struct Interrupt_State* state)
{
/*
* Hint: Before executing in user mode, you will need to call
* the Set_Kernel_Stack_Pointer() and Switch_To_Address_Space()
* functions.
*/
if (kthread->userContext != NULL) {
Switch_To_Address_Space(kthread->userContext);
Set_Kernel_Stack_Pointer(((ulong_t) kthread->stackPage) + PAGE_SIZE);
}
}
/*
* If the given thread has a User_Context,
* switch to its memory space.
*
* Params:
* kthread - the thread that is about to execute
* state - saved processor registers describing the state when
* the thread was interrupted
*/
void Switch_To_User_Context(struct Kernel_Thread* kthread, struct Interrupt_State* state)
{
/*
* Hint: Before executing in user mode, you will need to call
* the Set_Kernel_Stack_Pointer() and Switch_To_Address_Space()
* functions.
*/
if(kthread->userContext == NULL)
return;
// very important
Set_Kernel_Stack_Pointer(((ulong_t)kthread->stackPage) + PAGE_SIZE);
//Print("Switch_To_User_Context %x\n", kthread->userContext->entryAddr);
Switch_To_Address_Space(kthread->userContext);
}