startup file in assembler language

BaS_GNU/sources/startcf.S

@@ -0,0 +1,42 @@
+#include <MCF5475.h>
+
+_startup:
+		.extern	_initialize_hardware
+		.extern _rt_mbar
+
+		bra.s	warmstart
+		jmp		___BOOT_FLASH + 8 		/* that's also our reset vector */
+
+		/* disable interrupts */
+warmstart:
+		move.w #0x2700,sr
+
+		/* Initialize MBAR */
+
+		move.l	#__MBAR,d0
+		movec	d0,MBAR
+		move.l	d0,_rt_mbar
+
+		/* mmu off */
+		move.l	#__MMUBAR+1,d0
+		movec	d0,MMUBAR
+
+		clr.l	d0
+		move.l	d0,MCF_MMU_MMUCR
+
+		/* Initialize RAMBARs: locate SRAM and validate it */
+		move.l	#__RAMBAR0 + 0x7,d0 	/* supervisor only */
+		movec	d0,RAMBAR0
+		move.l	#__RAMBAR1 + 0x1,d0
+		movec	d0,RAMBAR1
+
+		/* set stack pointer to end of SRAM1 */
+		lea 	__SUP_SP,a7
+
+		/* instruction cache on */
+		move.l	#0x000C8100,d0
+		movec	d0,cacr
+		nop
+
+		/* initialize any hardware specific issues */
+		bra    _initialize_hardware