int.S:
;************************************************************************ ;*
;* FUNCTION
;*
;* INT_Initialize
;*
;* DESCRIPTION
;*
;* This function sets up the global system stack variable and
;* transfers control to the target independent initialization
;* function INC_Initialize. Responsibilities of this function
;* include the following:
;*
;* - Setup necessary processor/system control registers
;* - Initialize the vector table
;* - Setup the system stack pointers
;* - Setup the timer interrupt
;* - Calculate the timer HISR stack and priority
;* - Calculate the first available memory address
;* - Transfer control to INC_Initialize to initialize all of
;* the system components.
;*
;* Major Revision:
;*
;* M. Kyle Craig, Accelerated Technology, Inc.
;*
;*
;*
;*
;* CALLED BY
;*
;* Nothing. This function is the ENTRY point for Nucleus PLUS.
;*
;* CALLS
;*
;* INC_Initialize ? ? ? ? ? ? ? ? ? ? ?Common initialization
;*
;* INPUTS
;*
;* None
;*
;* OUTPUTS
;*
;* None
;*
;* HISTORY
;*
;* NAME DATE ? ? ? ? ? ? ? ? ? ?REMARKS
;*
;* W. Lamie ? ? ? ?08-27-1994 ? ? ?Created initial version 1.0
;* D. Lamie ? ? ? ?08-27-1994 ? ? ?Verified version 1.0
;*
;************************************************************************
;VOID ? ?INT_Initialize(void)
;{

????.def ? ?_c_int00
_c_int00

????.def ?_INT_Initialize
_INT_Initialize:

????; Insure that the processor is in supervisor mode. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?//設(shè)置了arm的svc模式
????MRS ? ? r0,CPSR ; Pickup current CPSR
????BIC ? ? r0,r0,#MODE_MASK ; Clear the mode bits
????ORR ? ? r0,r0,#SUP_MODE ; Set the supervisor mode bits
????ORR ? ? r0,r0,#LOCKOUT ; Insure IRQ/FIQ interrupts are ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? //關(guān)閉中斷
????????????????????????????????????????; locked out
????MSR ? ? CPSR,r0 ; Setup the new CPSR

????; Clear the un-initialized global and static C data areas.
????LDR ? ? r0,BSS_Start ; Pickup the start of the BSS area
????MOV r2,#0 ; Clear value in r2
????LDR ? ? r1,BSS_End ; Pickup the end of the BSS area

INT_BSS_Clear_Loop
????STR r2,[r0],#4 ; Clear a word ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?//初始化Bss段

INT_BSS_Clear_Check
????CMP r0,r1 ; Are the start and end equal?
????BNE ? ? INT_BSS_Clear_Loop ; If so, continue with BSS clear

????; Perform auto-initialization. if cinit is -1, then there is none.
????LDR ? ? r0, c_cinit
????CMN ? ? r0, #1
????BLNE ? ?_auto_init


????; Turn-on the I-Cache for the TI 925T Processor ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?//開啟I-Cache

????MRC ? ? p15,#0,r1,C1,C0,#0 ; Read the control register.
????ORR ? ? r1,r1,#0x1000 ; Set the I bit to enable Instruction Cache
????NOP
????MCR ? ? p15,#0,r1,C1,C0,#0 ; Write the control register.


; Setup the vectors loaded flag to indicate to other routines in the
; system whether or not all of the default vectors have been loaded.
; If INT_Loaded_Flag is 1, all of the default vectors have been loaded.
; Otherwise, if INT_Loaded_Flag is 0, registering an LISR cause the
; default vector to be loaded. In the ARM60 this variable is always
; set to 1. All vectors must be setup by this function.
; INT_Loaded_Flag = 0;

????MOV r0,#1 ; All vectors are assumed loaded
????LDR ? ? r1,Loaded_Flag ; Build address of loaded flag
????STR r0,[r1,#0] ; Initialize loaded flag


; Initialize the system stack pointers. This is done after the BSS is
; clear because the TCD_System_Stack pointer is a BSS ? It is
; assumed that available memory starts immediately after the end of the
; BSS section. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? //建立sys stack

????LDR ? ? r10,System_Stk_Limit ; Pickup the system stack limit (bottom of system stack)
????LDR ? ? r3,System_Limit ; Pickup sys stack limit addr
????STR r10,[r3, #0] ; Save stack limit

????LDR ? ? sp,System_Stack_SP ; Set-up the system stack pointer
????LDR ? ? r3,System_Stack ; Pickup system stack address
????STR sp,[r3, #0] ; Save stack pointer

????MRS ? ? r0,CPSR ; Pickup current CPSR
????BIC ? ? r0,r0,#MODE_MASK ; Clear the mode bits
????ORR ? ? r0,r0,#IRQ_MODE ; Set the IRQ mode bits
????MSR ? ? CPSR,r0 ; Move to IRQ mode

????LDR ? ? sp,IRQ_Stack_SP ; Setup IRQ stack pointer

????MRS ? ? r0,CPSR ; Pickup current CPSR
????BIC ? ? r0,r0,#MODE_MASK ; Clear the mode bits
????ORR ? ? r0,r0,#FIQ_MODE ; Set the FIQ mode bits
????MSR ? ? CPSR,r0 ; Move to the FIQ mode

????LDR ? ? sp,FIQ_Stack_SP ; Setup FIQ stack pointer

????MRS ? ? r0,CPSR ; Pickup current CPSR
????BIC ? ? r0,r0,#MODE_MASK ; Clear mode bits
????ORR ? ? r0,r0,#SUP_MODE ; Set the supervisor mode bits
????MSR ? ? CPSR,r0 ; All interrupt stacks are setup,
????????????????????????????????????????????; return to supervisor mode

; Define the global data structures that need to be initialized by this ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?//設(shè)置中斷
; routine. These structures are used to define the system timer
; management HISR.
; TMD_HISR_Stack_Ptr = (VOID *) r2;
; TMD_HISR_Stack_Size = TIMER_SIZE;
; TMD_HISR_Priority = TIMER_PRIORITY;

????LDR ? ? r2,HISR_Stack_Mem ; Get HISR stack memory address
????LDR ? ? r3,HISR_Stack_Ptr ; Pickup variable's address
????STR ? ? r2,[r3, #0] ? ? ? ? ? ? ? ? ? ? ; Setup timer HISR stack pointer
????MOV ? ? r1,#HISR_STACK_SIZE ? ? ? ? ? ? ; Pickup the timer HISR stack size
????LDR ? ? r3,HISR_Stack_Size ? ? ? ? ? ? ?; Pickup variable's address
????STR r1,[r3, #0] ; Setup timer HISR stack size
????MOV r1,#HISR_PRIORITY ; Pickup timer HISR priority (0-2)
????LDR ? ? r3,HISR_Priority ; Pickup variable's address
????STR ? ? r1,[r3, #0] ? ? ? ? ? ? ? ? ? ? ; Setup timer HISR priority

; Make a call to begin all board specific initialization. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?//初始化時鐘
; Begin with Initializing the Vector table and replacing
; default interrupts with Plus IRQs. ?Then setup the timer
; and begin the system clock.

????.if $$isdefed("NU_ROM_SUPPORT")

????BL ? ? ?_INT_Timer_Initialize ? ? ? ? ? ; Initialize the timer

????.else

????BL ? ? ?INT_Install_Vector_Table ? ? ? ?; Install the vector table
????BL ? ? ?_INT_Timer_Initialize ? ? ? ? ? ; Initialize the timer

????.endif

; Call INC_Initialize with a pointer to the first available memory
; address after the compiler's global data. This memory may be used
; by the application.
; INC_Initialize(first_available_memory);

????LDR ? ? r0,First_Avail_Mem ; Get address of first available memory
??????
????B ? ? ? _INC_Initialize ; to high-level initialization ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? //最后跳轉(zhuǎn)到_INC_Initialize,找不到函數(shù)在哪
;}

? ?。。。。。。 ? ?。。。。。。 初始化組件由三個部分組成，硬件在reset后首先進(jìn)入INT_initialize()，進(jìn)行板級的相關(guān)初始化，首先設(shè)置SVC mode，關(guān)中斷，然后將內(nèi)核從rom中拷貝至ram中，建立bss段，依次建立sys stack, irq stack和fiq stack，最后初始化timer，建立timer HISR的棧空間，看了一下2410平臺的代碼，一個tick大概是15.8ms，完成板級的初始化后就進(jìn)入了INC_initialize。
inc.c:

/*************************************************************************/
/* */
/* 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 */
/* */
/* inc.c ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Nucleus PLUS 1.14 */
/* */
/* COMPONENT */
/* */
/* IN - Initialization */
/* */
/* DESCRIPTION */
/* */
/* This file contains initialization and setup routines associated */
/* with the initialization component. */
/* */
/* DATA STRUCTURES */
/* */
/* None */
/* */
/* FUNCTIONS */
/* */
/* INC_Initialize ? ? ? ? ? ? ? ? ? ? ?Common system initialization */
/* */
/* DEPENDENCIES */
/* */
/* in_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Initialization functions */
/* er_extr.h Error handling function */
/* hi_extr.h History functions */
/* tc_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Thread Control functions */
/* mb_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Mailbox functions */
/* qu_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Queue functions */
/* pi_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Pipe functions */
/* sm_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Semaphore functions */
/* ev_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Event group functions */
/* pm_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Partition memory functions */
/* dm_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Dynamic memory functions */
/* tm_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? Timer functions */
/* io_extr.h ? ? ? ? ? ? ? ? ? ? ? ? ? I/O Driver functions */
/* */
/* HISTORY */
/* */
/* DATE REMARKS */
/* */
/* 03-01-1993 ? ? ?Created initial version 1.0 */
/* 04-19-1993 ? ? ?Verified version 1.0 */
/* 03-01-1994 ? ? ?Replaced void with VOID, */
/* resulting in version 1.1 */
/* */
/* 03-18-1994 ? ? ?Verified version 1.1 */
/* 04-17-1996 ? ? ?updated to version 1.2 */
/* 03-20-1998 ? ? ?Moved the INC_Initialize_State */
/* define values into their own */
/* in_defs.h include file as part */
/* of SPR455. This creates */
/* version 1.2a. */
/* 03-24-1998 ? ? ?Released version 1.3. */
/* 03-26-1999 ? ? ?Released 1.11m (new release */
/* numbering scheme) */
/* 04-17-2002 ? ? ?Released version 1.13m */
/* 11-07-2002 ? ? ?Released version 1.14 */
/*************************************************************************/
#define ? ? ? ? NU_SOURCE_FILE


#include "in_defs.h" /* Initialization defines */
#include "in_extr.h" /* Initialization functions */
#include "hi_extr.h" /* History functions */
#include "er_extr.h" /* Error handling function */
#include "tc_extr.h" /* Thread Control functions */
#include "mb_extr.h" /* Mailbox functions */
#include "qu_extr.h" /* Queue functions */
#include "pi_extr.h" /* Pipe functions */
#include "sm_extr.h" /* Semaphore functions */
#include "ev_extr.h" /* Event group functions */
#include "pm_extr.h" /* Partition memory functions*/
#include "dm_extr.h" /* Dynamic memory functions */
#include "tm_extr.h" /* Timer functions */
#include "io_extr.h" /* I/O Driver functions */


/* Define global variable that contains the state of initialization. This
???flag is for information use only. */

INT INC_Initialize_State;


/* Define external functions that access the release and license
???information. */

CHAR *RLC_Release_Information(VOID);
CHAR *LIC_License_Information(VOID);

#if defined(NU_MODULE_SUPPORT) && (NU_MODULE_SUPPORT > 0)

/* Prototypes for Module Initialization funcitons */
STATUS MRC_Initialize(VOID);
STATUS MSC_Initialize(VOID);

#endif

/*************************************************************************/
/* */
/* FUNCTION */
/* */
/* INC_Initialize */
/* */
/* DESCRIPTION */
/* */
/* This function is the main initialization function of the system. */
/* All components are initialized by this function. After system */
/* initialization is complete, the Application_Initialize routine */
/* is called. After all initialization is complete, this function */
/* calls TCT_Schedule to start scheduling tasks. */
/* */
/* CALLED BY */
/* */
/* INT_Initialize ? ? ? ? ? ? ? ? ? ? ?Target dependent initialize */
/* */
/* CALLS */
/* */
/* Application_Initialize ? ? ? ? ? ? ?Application initialize */
/* RLC_Release_Information ? ? ? ? ? ? Release information */
/* LIC_License_Information ? ? ? ? ? ? License information */
/* ERI_Initialize Error handling initialize */
/* HII_Initialize History initialization */
/* TCI_Initialize ? ? ? ? ? ? ? ? ? ? ?Thread control initialize */
/* MBI_Initialize ? ? ? ? ? ? ? ? ? ? ?Mailbox initialize */
/* QUI_Initialize ? ? ? ? ? ? ? ? ? ? ?Queue initialize */
/* PII_Initialize ? ? ? ? ? ? ? ? ? ? ?Pipe initialize */
/* SMI_Initialize ? ? ? ? ? ? ? ? ? ? ?Semaphore initialize */
/* EVI_Initialize ? ? ? ? ? ? ? ? ? ? ?Event flag initialize */
/* PMI_Initialize ? ? ? ? ? ? ? ? ? ? ?Partition memory initialize */
/* DMI_Initialize ? ? ? ? ? ? ? ? ? ? ?Dynamic memory initialize */
/* TMI_Initialize ? ? ? ? ? ? ? ? ? ? ?Timer initialize */
/* IOI_Initialize ? ? ? ? ? ? ? ? ? ? ?I/O Driver initialize */
/* MRC_Initialize ? ? ? ? ? ? ? ? ? ? ?Memory Region initialize */
/* MSC_Initialize ? ? ? ? ? ? ? ? ? ? ?Module Support initialize */
/* TCT_Schedule ? ? ? ? ? ? ? ? ? ? ? ?Thread scheduling loop */
/* */
/* INPUTS */
/* */
/* first_available_memory ? ? ? ? ? ? ?Pointer to available memory */
/* */
/* OUTPUTS */
/* */
/* None */
/* */
/* HISTORY */
/* */
/* DATE REMARKS */
/* */
/* 03-01-1993 ? ? ?Created initial version 1.0 */
/* 04-19-1993 ? ? ?Verified version 1.0 */
/* */
/*************************************************************************/
VOID ?INC_Initialize(VOID *first_available_memory)
{

????/* Indicate that initialization is starting. */
????INC_Initialize_State = INC_START_INITIALIZE;

????/* Call release information function. */
????RLC_Release_Information();

????/* Call license information function. */
????LIC_License_Information();

????/* Initialize the Error handling (ER) component. */
????ERI_Initialize();

????/* Initialize the History (HI) component. */
????HII_Initialize();

#if defined(NU_MODULE_SUPPORT) && (NU_MODULE_SUPPORT > 0)

????MRC_Initialize(); /* Initialize Memory Region component */
????MSC_Initialize(); /* Initialize Module Support component */

#endif

????/* Initialize the Thread Control (TC) component. */
????TCI_Initialize();

????/* Initialize the Mailbox (MB) component. */
????MBI_Initialize();

????/* Initialize the Queue (QU) component. */
????QUI_Initialize();

????/* Initialize the Pipe (PI) component. */
????PII_Initialize();

????/* Initialize the Semaphore (SM) component. */
????SMI_Initialize();

????/* Initialize the Event Group (EV) component. */
????EVI_Initialize();

????/* Initialize the Partition memory (PM) component. */
????PMI_Initialize();

????/* Initialize the Dynamic memory (DM) component. */
????DMI_Initialize();

????/* Initialize the Timer (TM) component. */
????TMI_Initialize();

????/* Initialize the I/O Driver (IO) component. */
????IOI_Initialize();

????/* Invoke the application-supplied initialization function. */
????Application_Initialize(first_available_memory); ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?//應(yīng)用程序初始化
????/* Indicate that initialization is finished. */
????INC_Initialize_State = INC_END_INITIALIZE;

????/* Start scheduling threads of execution. */
????TCT_Schedule();
} 到這里找不到函數(shù)了。。。
csc.c：包含nucleus plus系統(tǒng)中使用的連接表處理工具，采用雙向循環(huán)鏈表（doubley-linked circulat lists）

dmc.c：包含動態(tài)內(nèi)存管理組件的核心事務(wù)
dmce.c：包含動態(tài)內(nèi)存管理組件中的函數(shù)錯誤檢查例程，可以關(guān)閉？
dmd.c：包含動態(tài)內(nèi)存管理組件中的全局?jǐn)?shù)據(jù)結(jié)構(gòu)
dmf.c：包含獲取管理動態(tài)內(nèi)存管理組件的事實的例程
dmi.c：包含動態(tài)內(nèi)存管理組件的初始化例程
dms.c：包含動態(tài)內(nèi)存管理組件的補充例程

erc.c：包含錯誤管理組件的核心事務(wù)
erd.c：包含錯誤管理組件的官居數(shù)據(jù)結(jié)構(gòu)
eri.c：包含錯誤管理組件初始化例程

evc.c：包含事件組管理組件核心事務(wù)
evce.c：包含事件組錯誤檢查
evd.c：事件組全局?jǐn)?shù)據(jù)結(jié)構(gòu)
evf.c
evi.c

hic.c:包含歷史管理組件的核心事務(wù)
hid.c
hii.c

inc.c
int.s

ioc.c：I/O驅(qū)動管理核心事務(wù)
ioce.c
iod.c
iof.c
ioi.c

lic.c：license informations組件核心事務(wù)
lid.c

mbc.c：郵箱管理組件核心事務(wù)
mbce.c
mbd.c
mbf.c
mbi.c
mbs.c
mbse.c

pic.c：管道管理核心事務(wù)
pice.c
pid.c
pif.c
pii.c
pis.c
pise.c

pmc.c：內(nèi)存管理劃分(partition)核心事務(wù)
pmce.c
pmd.c
pmf.c
pmi.c

quc.c：隊列管理核心事務(wù)
quce.c
qud.c
quf.c
qui.c
qus.c
quse.c

rlc.c：版本信息（Release Information）核心事務(wù)
rld.c

sdc.c：包含串行驅(qū)動特定功能

smc.c：信號量管理核心事務(wù)
smce.c
smd.c
smd.c
smf.c
smi.c
sms.c
smse.c

tcc.c：進(jìn)程控制
tcce.c
tcd.c
tcf.c
tci.c
tcs.c
tcse.c
tct.s

tmc.c：此函數(shù)負(fù)責(zé)提供初始化的任務(wù)定時器，此程序必須在svc/usr模式下內(nèi)核切換成svc模式運行。
tmd.c
tmf.c
tmi.c
tms.c
tmse.c
tmt.s

文件命名前2個字母是組件的縮寫，后面的字母是不同的文件。
d包含了相關(guān)全局變量，i是初始化部分，f是組件管理的對象的信息，c是核心函數(shù)，ce是錯誤處理，se是補充。

? ? ??