/*
* Set up the a user mode thread.
*/
/*static*/ void Setup_User_Thread(
struct Kernel_Thread* kthread, struct User_Context* userContext)
{
/*
* Hints:
* - Call Attach_User_Context() to attach the user context
* to the Kernel_Thread
* - Set up initial thread stack to make it appear that
* the thread was interrupted while in user mode
* just before the entry point instruction was executed
* - The esi register should contain the address of
* the argument block
*/
Attach_User_Context(kthread, userContext);
/* ushort_t dsSelector */
Push(kthread, userContext->dsSelector);
/* Stack pointer */
Push(kthread, (userContext->stackPointerAddr));
/*
* The EFLAGS register will have all bits clear.
* The important constraint is that we want to have the IF
* bit clear, so that interrupts are disabled when the
* thread starts.
*/
Push(kthread, 0UL); /* EFLAGS */
/* ushort_t csSelector */
Push(kthread, userContext->csSelector);
/* Push the address of the start function. */
Push(kthread, userContext->entryAddr);
/* Push fake error code and interrupt number. */
Push(kthread, 0UL);
Push(kthread, 0UL);
/* Push initial values for general-purpose registers. */
Push(kthread, 0UL); /* eax */
Push(kthread, 0UL); /* ebx */
Push(kthread, 0UL); /* ecx */
Push(kthread, 0UL); /* edx */
Push(kthread, userContext->argBlockAddr); /* esi */
Push(kthread, 0UL); /* edi */
Push(kthread, 0UL); /* ebp */
/*
* Push values for saved segment registers.
* Only the ds and es registers will contain valid selectors.
*/
Push(kthread, (ulong_t)userContext->dsSelector); /* ds */
Push(kthread, (ulong_t)userContext->dsSelector); /* es */
Push(kthread, (ulong_t)userContext->dsSelector); /* fs */
Push(kthread, (ulong_t)userContext->dsSelector); /* gs */
}
/*
* Set up the a user mode thread.
*/
/*static*/ void Setup_User_Thread(
struct Kernel_Thread* kthread, struct User_Context* userContext)
{
/*
* Hints:
* - Call Attach_User_Context() to attach the user context
* to the Kernel_Thread
* - Set up initial thread stack to make it appear that
* the thread was interrupted while in user mode
* just before the entry point instruction was executed
* - The esi register should contain the address of
* the argument block
*/
ulong_t ds = (ulong_t)(userContext->dsSelector);
Attach_User_Context(kthread, userContext);
Push(kthread, ds); // Data Selector
Push(kthread, (ulong_t)(userContext->stackPointerAddr)); // Stack Pointer
Push(kthread, EFLAGS_IF); /* EFLAGS */
Push(kthread, (ulong_t)(userContext->csSelector)); // Code Selector
Push(kthread, (ulong_t)(userContext->entryAddr)); // Program Counter
/* Push fake error code and interrupt number. */
Push(kthread, 0);
Push(kthread, 0);
/* Push initial values for general-purpose registers. */
Push(kthread, 0); /* eax */
Push(kthread, 0); /* ebx */
Push(kthread, 0); /* edx */
Push(kthread, 0); /* edx */
Push(kthread, (ulong_t)(userContext->argBlockAddr)); /* esi */
Push(kthread, 0); /* edi */
Push(kthread, 0); /* ebp */
/*
* Push values for saved segment registers.
* Only the ds and es registers will contain valid selectors.
* The fs and gs registers are not used by any instruction
* generated by gcc.
*/
Push(kthread, ds); /* ds */
Push(kthread, ds); /* es */
Push(kthread, ds); /* fs */
Push(kthread, ds); /* gs */
}
/*
* Set up the a user mode thread.
*/
/*static*/ void Setup_User_Thread(
struct Kernel_Thread* kthread, struct User_Context* userContext)
{
//lacki
/*
* Hints:
* - Call Attach_User_Context() to attach the user context
* to the Kernel_Thread
* - Set up initial thread stack to make it appear that
* the thread was interrupted while in user mode
* just before the entry point instruction was executed
* - The esi register should contain the address of
* the argument block
*/
//TODO("Create a new thread to execute in user mode");
Attach_User_Context(kthread, userContext);
/* data selector */
Push(kthread, (*userContext).dsSelector);
/* stackPointer */
Push(kthread, (*userContext).stackPointerAddr);
/*
* EFLAGS_IF is a 32bit int with the 9th bit 1 and the other bits 0
* EFLAGS OR EFLAGS_IF return the EFLAGS with bit 9 set to 1
* EFLAGS_IF is defined in int.h
*/
//Print("original eflags: %lu \n", Get_Current_EFLAGS());
ulong_t eflags = Get_Current_EFLAGS() | EFLAGS_IF;
//Print("current eflags: %lu \n", eflags);
Push(kthread, eflags);
/* code Selector */
Push(kthread, (*userContext).csSelector);
/* code entry address */
Push(kthread, (*userContext).entryAddr);
/* error code */
Push(kthread, 0);
/* Interrupt Number */
Push(kthread, 0);
/* EAX */
Push(kthread, 0);
/* EBX */
Push(kthread, 0);
/* ECX */
Push(kthread, 0);
/* EDX */
Push(kthread, 0);
/* esi */
Push(kthread, (*userContext).argBlockAddr);
/* EDI */
Push(kthread, 0);
/* EBP */
Push(kthread, 0);
/* ds */
Push(kthread, (*userContext).dsSelector);
/* es */
Push(kthread, (*userContext).dsSelector);
/* fs */
Push(kthread, (*userContext).dsSelector);
/* gs */
Push(kthread, (*userContext).dsSelector);
}
