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/**
* @file
*
* MRM332 Assembly Start Up Code
*/
/*
* COPYRIGHT (c) 2000.
* Matt Cross <profesor@gweep.net>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*
*/
#include "mrm332.h"
#include <rtems/asm.h>
#include <rtems/m68k/sim.h>
BEGIN_CODE
/* Put the header necessary for the modified CPU32bug to automatically
start up rtems: */
#if 1
.long 0xbeefbeef ;
#endif
.long 0 ;
.long start ;
.global start
start:
oriw #0x0700,sr /* Mask off interupts */
// Set VBR to CPU32Bug vector table address
movel #0x0,d0 /* Use the initial vectors until we get going */
movecl d0,vbr
/* Set stack pointer */
movel #_ISR_Stack_area_end,d0
movel d0,sp
movel d0,a6
/* include in ram_init.S */
/*
* Initalize the SIM module.
* The stack pointer is not usable until the RAM chip select lines
* are configured. The following code must remain inline.
*/
/* Module Configuration Register */
/* see section(s) 3.1.3-3.1.6 of the SIM Reference Manual */
/* SIMCR etc and SAM macro all defined in sim.h found at */
/* /cpukit/score/cpu/m68k/rtems/m68k/sim.h */
/* The code below does the following: */
/* - Sets Freeze Software Enable */
/* - Turns off Show Cycle Enable */
/* - Sets the location of SIM module mapping */
/* - Sets the SIM Interrupt Arbitration Field */
lea SIMCR, a0
movew #FRZSW,d0
oriw #SAM(0,8,SHEN),d0
oriw #(MM*SIM_MM),d0
oriw #SAM(SIM_IARB,0,IARB),d0
movew d0, a0@
jsr start_c /* Jump to the C startup code */
END_CODE
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