📄 int_rom.s
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;/*************************************************************************/
;/* */
;/* Copyright Mentor Graphics Corporation 2002 */
;/* All Rights Reserved. */
;/* */
;/* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */
;/* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */
;/* SUBJECT TO LICENSE TERMS. */
;/* */
;/*************************************************************************/
;
;/*************************************************************************/
;/* */
;/* FILE NAME VERSION */
;/* */
;/* int_rom.s Nucleus PLUS\ARM PID\ADS 1.13.24 */
;/* */
;/* COMPONENT */
;/* */
;/* IN - Initialization */
;/* */
;/* DESCRIPTION */
;/* */
;/* This file contains the target processor dependent initialization */
;/* routines and data for running from FLASH. */
;/* */
;/* */
;/* FUNCTIONS */
;/* */
;/* INT_Reset Target initialization for */
;/* reset exception */
;/* */
;/* DEPENDENCIES */
;/* */
;/* int_defs.s Initialization constants */
;/* */
;/* HISTORY */
;/* */
;/* NAME DATE REMARKS */
;/* */
;/* D. Driscoll 10 May 2001 Verified and released */
;/* version 1.13.21 */
;/* C. Sheppard 10-15-2001 Released version 1.13.22 */
;/* J. Pregeant 04-17-2002 Released version 1.13.23 */
;/* Jack Pregeant 08-16-2002 Released version 1.13.24 */
;/*************************************************************************/
;/* NOTE: Define "NU_INT_ROM_SUPPORT" to run out of Flash.
; To do this use the -pd option on the assembler line:
; -pd "NU_INT_ROM_SUPPORT SETL {TRUE}" */
;/*--------------------------------------------------------------*/
IF (:LNOT: :DEF: NU_INT_ROM_SUPPORT)
GBLL NU_INT_ROM_SUPPORT ;声明一个逻辑变量，并且初始化为false
NU_INT_ROM_SUPPORT SETL {TRUE};给这个逻辑变量赋值
ENDIF
;/*----------------------------------------------------------------*/
IF (:DEF: NU_INT_ROM_SUPPORT)
IF NU_INT_ROM_SUPPORT
;/*************************************************************************/
;/* INCLUDE FILE */
;/*************************************************************************/
;/* Define constants used in low-level initialization. */
INCLUDE int_defs.s
;/*************************************************************************/
;/* EXTERNAL VARIABLE/FUNCTION DECLARATIONS */
;/*************************************************************************/
IMPORT INT_Undef_Inst
IMPORT INT_Software
IMPORT INT_Prefetch_Abort
IMPORT INT_Data_Abort
IMPORT INT_Reserved
IMPORT INT_IRQ
IMPORT INT_FIQ
;/*************************************************************************/
;/* INTERRUPT TABLES */
;/*************************************************************************/
AREA INT_Init, CODE, READONLY ;声明一个INT_Init的只读代码区
ENTRY ;程序的入口
;/* This is a label used with the ARM linker -first command to place the code
; starting at this label first in the image to be flashed */
EXPORT INT_ROM_ENTRY
INT_ROM_ENTRY
b INT_Reset
LDR pc,Undef_Inst_Addr ; Undefined Instruction
LDR pc,Software_Addr ; Software Generated
LDR pc,Abort_Prefetch_Addr ; Abort Prefetch
LDR pc,Abort_Data_Addr ; Abort Data
LDR pc,Reserved_Addr ; Reserved
LDR pc,IRQ_Addr ; Standard External Interrupt
LDR pc,FIQ_Addr ; Fast External Interrupt
Initialize_Addr DCD INT_Initialize
Undef_Inst_Addr DCD INT_Undef_Inst
Software_Addr DCD INT_Software
Abort_Prefetch_Addr DCD INT_Prefetch_Abort
Abort_Data_Addr DCD INT_Data_Abort
Reserved_Addr DCD INT_Reserved
IRQ_Addr DCD INT_IRQ
FIQ_Addr DCD INT_FIQ
;/*************************************************************************/
;/* */
;/* FUNCTION */
;/* */
;/* INT_Reset */
;/* */
;/* DESCRIPTION */
;/* */
;/* This function performs the necessary hardware specific */
;/* intialization to run from flash on the ARM 6/7 PID board */
;/* */
;/* CALLED BY */
;/* */
;/* Nothing. This function is the ENTRY point for Nucleus PLUS */
;/* when running from FLASH. */
;/* */
;/* CALLS */
;/* */
;/* INT_Initialize */
;/* */
;/* INPUTS */
;/* */
;/* None */
;/* */
;/* OUTPUTS */
;/* */
;/* None */
;/* */
;/* HISTORY */
;/* */
;/* NAME DATE REMARKS */
;/* */
;/* D. Driscoll 9 May 2001 Created initial version */
;/*************************************************************************/
EXPORT INT_Reset
INT_Reset
MRS a1,CPSR ; 将状态寄存器CPSR中的内容保存到通用寄存器a1中
BIC a1,a1,#MODE_MASK ; M[4:0]=0b00000不在任何工作模式
ORR a1,a1,#SUP_MODE ; M[4:0]=0b10011 supervisor mode
ORR a1,a1,#LOCKOUT ; I=1，F=1.屏蔽IRQ和FIQ
MSR CPSR_cxsf,a1 ; 将通用寄存器a1中的内容保存到状态寄存器CPSR中
MOV a1, #ICBASE ; ICBASE=01e00000 Get interrupt controller base address
MVN a2, #0 ; Get clear value (a2=0xFFFFFFFF - clear all interrupts)
STR a2, [a1, #IRQ_CLEAR_OFFSET] ; 将a2中的数据写到（a1＋IRQ_CLEAR_OFFSET)Clear all IRQ interrupts
STR a2, [a1, #FIQ_CLEAR_OFFSET] ; 将a2中的数据写到（a1＋FIQ_CLEAR_OFFSET)Clear all FIQ interrupts
; Branch to INT_Intialize and start intializing Nucleus RTOS
IMPORT INT_Initialize
B INT_Initialize ;进入板级初始化
ENDIF ;/* NU_INT_ROM_SUPPORT */
ENDIF ;/* (:DEF: NU_INT_ROM_SUPPORT) */
END
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