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Starting a Task from Scratch
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How to start a task without first having save a context.

Initial configuration of the stack
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* Primes the pump
* sets the stage for starting a task by jumping in as though the task had been interrupted earlier.
* what goes in the control block
* what goes in the stack
* what would you put there to make of you were going to restore and run from it?

.. code-block:: c

    int initialize_stack(int* stack, void* task_address)
    {
    	// Calculate the top of the stack.
    	int *stkptr = (int*)(stack + STACKSIZE - 1);

    	*(stkptr)   = (int)task_address;   // PC
    	*(--stkptr) = (int)0x0e0e0e0e;     // R14 - LR
    	*(--stkptr) = (int)0x0c0c0c0c;     // R12
    	*(--stkptr) = (int)0x0b0b0b0b;     // R11
    	*(--stkptr) = (int)0x0a0a0a0a;     // R10
    	*(--stkptr) = (int)0x09090909;     // R9
    	*(--stkptr) = (int)0x08080808;     // R8
    	*(--stkptr) = (int)0x07070707;     // R7
    	*(--stkptr) = (int)0x06060606;     // R6
    	*(--stkptr) = (int)0x05050505;     // R5
    	*(--stkptr) = (int)0x04040404;     // R4
    	*(--stkptr) = (int)0x03030303;     // R3
    	*(--stkptr) = (int)0x02020202;     // R2
    	*(--stkptr) = (int)0x01010101;     // R1
    	*(--stkptr) = (int)0x00000000;     // R0
    	*(--stkptr) = ARM_SVC_MODE_ARM;    // CPSR

    	return (int)(stkptr);
    }