halboot.si

ecos为实时嵌入式操作系统

#ifndef CYGONCE_HAL_HALBOOT_SI /* -*-asm-*- */
#define CYGONCE_HAL_HALBOOT_SI
// ====================================================================
//
//	<platform>/halboot.si
//
//	HAL bootup platform-oriented code (assembler)
//
// ====================================================================
//####COPYRIGHTBEGIN####
//
// -------------------------------------------
// The contents of this file are subject to the Cygnus eCos Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License.  You may obtain a copy of the License at
// http://sourceware.cygnus.com/ecos
// 
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
// License for the specific language governing rights and limitations under
// the License.
// 
// The Original Code is eCos - Embedded Cygnus Operating System, released
// September 30, 1998.
// 
// The Initial Developer of the Original Code is Cygnus.  Portions created
// by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions.  All Rights Reserved.
// -------------------------------------------
//
//####COPYRIGHTEND####
// ====================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): 	        hmt
// Contributors:	hmt
// Date:	        1999-02-01
// Purpose:	        Bootup code, platform oriented.
// Description:
//
//####DESCRIPTIONEND####
//
// ====================================================================

// External Platform Initial Setup
//
// This should set up RAM and caches, and calm down any external
// interrupt sources.
//
// It is just plain included in vectors.S
//
// RAM has not yet been touched at all; in fact all you have is a
// register window selected.


	! Empty macro for debugging vectors.S
	.macro led val
        .endm

	! First of all - before setting up the stack - set
	! the available memory to the full 4Mb;
#define MEC_MEMCFG (0x01f80010)
	sethi	%hi( MEC_MEMCFG ), %g1
	ld	[ %g1 + %lo(MEC_MEMCFG) ], %g2
	mov	7, %g3
	sll	%g3, 10, %g3	! Bits 10,11,12 are of interest
	andn	%g2, %g3, %g2
	mov	4, %g3
	sll	%g3, 10, %g3	! Bits 10,11,12 are of interest
	or	%g2, %g3, %g2	! Shift 256k left 4 times to
	st	%g2, [ %g1 + %lo(MEC_MEMCFG) ]
					! ...give memsize of 4Mb

	! then copy the branch instructions into the vector
	rd	%tbr, %g1
	andn	%g1, 0xfff, %g1		! clear non-address bits
	sethi	%hi(real_vector_instructions), %l0
	or	%l0, %lo(real_vector_instructions), %l0
	ld	[ %l0 ], %l1
	st	%l1, [ %g1 ]		! into the vector
	ld	[ %l0 + 4 ], %l1
	st	%l1, [ %g1 + 4 ]	! into the vector

#endif  /* CYGONCE_HAL_HALBOOT_SI */
/* EOF halboot.si */