asm.s

一款类linux的操作系统源码

;/*
; *  Roadrunner/pk
; *    Copyright (C) 1989-2001  Cornfed Systems, Inc.
; *
; *  The Roadrunner/pk operating system is free software; you can
; *  redistribute and/or modify it under the terms of the GNU General
; *  Public License, version 2, as published by the Free Software
; *  Foundation.
; *
; *  This program is distributed in the hope that it will be useful,
; *  but WITHOUT WARRANTY; without even the implied warranty of
; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; *  GNU General Public License for more details.
; *
; *  You should have received a copy of the GNU General Public
; *  License along with this program; if not, write to the Free
; *  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
; *  MA 02111-1307 USA
; *
; *  More information about the Roadrunner/pk operating system of
; *  which this file is a part is available on the World-Wide Web
; *  at: http://www.cornfed.com.
; *
; */



	AREA |C$$code|, CODE, READONLY

	EXPORT	proc_jmp

proc_jmp
    stmfd   sp!,{r0-r12}	     
    str     sp , [r0]

    ldr     sp , [r1]
    ldmfd   sp!,{r0-r12} 

    mov	   pc,lr



	EXPORT	DisableInterrupt
DisableInterrupt
;This function works only if the processor is in previliged mode.

NOINT	    EQU	0xc0

    mrs	    r0,cpsr
    orr	    r0,r0,#NOINT
    msr	    cpsr_cxsf,r0		

    mov	    pc,lr


	EXPORT	EnableInterrupt
EnableInterrupt
;This function works only if the processor is in previliged mode.

    mrs	    r0,cpsr
    bic	    r0,r0,#NOINT
    msr	    cpsr_cxsf,r0		

    mov	    pc,lr

	END