?? 44binit.s
字號(hào):
; *******************************************************
; * NAME : 44BINIT.S *
; * Version : 10.April.2000 *
; * Description: *
; * C start up codes *
; * Configure memory, Initialize ISR ,stacks *
; * Initialize C-variables *
; * Fill zeros into zero-initialized C-variables *
; *******************************************************
;GET option.a
;GET memcfg.a
GET memcfg.s
;Memory Area
;GCS6 64M 16bit(8MB) DRAM/SDRAM(0xc000000-0xc7fffff)
;APP RAM=0xc000000~0xc7effff
;44BMON RAM=0xc7f0000-0xc7fffff
;STACK =0xc7ffa00
;Interrupt Control
INTPND EQU 0x01e00004
INTMOD EQU 0x01e00008
INTMSK EQU 0x01e0000c
I_ISPR EQU 0x01e00020
I_CMST EQU 0x01e0001c
;Watchdog timer
WTCON EQU 0x01d30000
;Clock Controller
PLLCON EQU 0x01d80000
CLKCON EQU 0x01d80004
LOCKTIME EQU 0x01d8000c
;Memory Controller
REFRESH EQU 0x01c80024
;BDMA destination register
BDIDES0 EQU 0x1f80008
BDIDES1 EQU 0x1f80028
;Pre-defined constants
USERMODE EQU 0x10
FIQMODE EQU 0x11
IRQMODE EQU 0x12
SVCMODE EQU 0x13
ABORTMODE EQU 0x17
UNDEFMODE EQU 0x1b
MODEMASK EQU 0x1f
NOINT EQU 0xc0
;check if tasm.exe is used.
GBLL THUMBCODE ;global logical variable, init. to {false}
[ {CONFIG} = 16 ;[=if,{CONFIG}:build-in variable defined by ARM assembler,16=assembing Thumbcode.
THUMBCODE SETL {TRUE} ;SETL:set the logic variable
CODE32 ;changing from Thumb state to Arm state
| ;|=else
THUMBCODE SETL {FALSE}
] ;]=endif
[ THUMBCODE
CODE32 ;for start-up code for Thumb mode???
]
MACRO
$HandlerLabel HANDLER $HandleLabel
$HandlerLabel
sub sp,sp,#4 ;decrement sp(to store jump address)
stmfd sp!,{r0} ;PUSH the work register to stack(lr does't push because it return to original address)
ldr r0,=$HandleLabel;load the address of HandleXXX to r0
ldr r0,[r0] ;load the contents(service routine start address) of HandleXXX
str r0,[sp,#4] ;store the contents(ISR) of HandleXXX to stack
ldmfd sp!,{r0,pc} ;POP the work register and pc(jump to ISR)
MEND
IMPORT |Image$$RO$$Limit| ; End of ROM code (=start of ROM data)
IMPORT |Image$$RW$$Base| ; Base of RAM to initialise
IMPORT |Image$$ZI$$Base| ; Base and limit of area
IMPORT |Image$$ZI$$Limit| ; to zero initialise;
IMPORT Main ; The main entry of mon program
AREA Init,CODE,READONLY;該偽指令定義了一個(gè)代碼段，段名為Init，屬性為只讀
ENTRY ;指定應(yīng)用程序的入口點(diǎn)
;****************************************************************************
b ResetHandler ; Reset 程序無條件跳轉(zhuǎn)到標(biāo)號(hào)ResetHandler 處執(zhí)行
ldr pc, =(_IRQ_BASEADDRESS + 0x04) ; HandlerUndef
ldr pc, =(_IRQ_BASEADDRESS + 0x08) ; HandlerSWI
ldr pc, =(_IRQ_BASEADDRESS + 0x0C) ; HandlerPabort
ldr pc, =(_IRQ_BASEADDRESS + 0x10) ; HandlerDAbort
ldr pc, =(_IRQ_BASEADDRESS + 0x14) ; HandlerReserved
ldr pc, =(_IRQ_BASEADDRESS + 0x18) ; HandlerIRQ
ldr pc, =(_IRQ_BASEADDRESS + 0x1C) ; HandlerFIQ
;***************************************************************************
;***IMPORTANT NOTE***
;If the H/W vectored interrutp mode is enabled, The above two instructions should
;be changed like below, to work-around with H/W bug of S3C44B0X interrupt controller.
; b HandlerIRQ -> subs pc,lr,#4
; b HandlerIRQ -> subs pc,lr,#4
VECTOR_BRANCH
ldr pc,=HandlerEINT0 ;mGA H/W interrupt vector table
ldr pc,=HandlerEINT1 ;
ldr pc,=HandlerEINT2 ;
ldr pc,=HandlerEINT3 ;
ldr pc,=HandlerEINT4567 ;
ldr pc,=HandlerTICK ;mGA
b .
b .
ldr pc,=HandlerZDMA0 ;mGB
ldr pc,=HandlerZDMA1 ;
ldr pc,=HandlerBDMA0 ;
ldr pc,=HandlerBDMA1 ;
ldr pc,=HandlerWDT ;
ldr pc,=HandlerUERR01 ;mGB
b .
b .
ldr pc,=HandlerTIMER0 ;mGC
ldr pc,=HandlerTIMER1 ;
ldr pc,=HandlerTIMER2 ;
ldr pc,=HandlerTIMER3 ;
ldr pc,=HandlerTIMER4 ;
ldr pc,=HandlerTIMER5 ;mGC
b .
b .
ldr pc,=HandlerURXD0 ;mGD
ldr pc,=HandlerURXD1 ;
ldr pc,=HandlerIIC ;
ldr pc,=HandlerSIO ;
ldr pc,=HandlerUTXD0 ;
ldr pc,=HandlerUTXD1 ;mGD
b .
b .
ldr pc,=HandlerRTC ;mGKA
b . ;
b . ;
b . ;
b . ;
b . ;mGKA
b .
b .
ldr pc,=HandlerADC ;mGKB
b . ;
b . ;
b . ;
b . ;
b . ;mGKB
b .
b .
;0xe0=EnterPWDN
ldr pc,=EnterPWDN
LTORG
HandlerFIQ HANDLER HandleFIQ
HandlerIRQ HANDLER HandleIRQ
HandlerUndef HANDLER HandleUndef
HandlerSWI HANDLER HandleSWI
HandlerDabort HANDLER HandleDabort
HandlerPabort HANDLER HandlePabort
HandlerADC HANDLER HandleADC
HandlerRTC HANDLER HandleRTC
HandlerUTXD1 HANDLER HandleUTXD1
HandlerUTXD0 HANDLER HandleUTXD0
HandlerSIO HANDLER HandleSIO
HandlerIIC HANDLER HandleIIC
HandlerURXD1 HANDLER HandleURXD1
HandlerURXD0 HANDLER HandleURXD0
HandlerTIMER5 HANDLER HandleTIMER5
HandlerTIMER4 HANDLER HandleTIMER4
HandlerTIMER3 HANDLER HandleTIMER3
HandlerTIMER2 HANDLER HandleTIMER2
HandlerTIMER1 HANDLER HandleTIMER1
HandlerTIMER0 HANDLER HandleTIMER0
HandlerUERR01 HANDLER HandleUERR01
HandlerWDT HANDLER HandleWDT
HandlerBDMA1 HANDLER HandleBDMA1
HandlerBDMA0 HANDLER HandleBDMA0
HandlerZDMA1 HANDLER HandleZDMA1
HandlerZDMA0 HANDLER HandleZDMA0
HandlerTICK HANDLER HandleTICK
HandlerEINT4567 HANDLER HandleEINT4567
HandlerEINT3 HANDLER HandleEINT3
HandlerEINT2 HANDLER HandleEINT2
HandlerEINT1 HANDLER HandleEINT1
HandlerEINT0 HANDLER HandleEINT0
;*************************************************************************
;IRQ ==the program put this phrase to 0xc000000
ExceptionHanlderBegin
b .
ldr pc, MyHandleUndef ; HandlerUndef
ldr pc, MyHandleSWI ; HandlerSWI
ldr pc, MyHandlePabort ; HandlerPabort
ldr pc, MyHandleDabort ; HandlerDAbort
b . ; HandlerReserved
ldr pc, MyHandleIRQ ; HandlerIRQ
ldr pc, MyHandleFIQ ; HandlerFIQ
MyHandleUndef DCD HandleUndef ;reserve a word(32bit)
MyHandleSWI DCD HandleSWI
MyHandlePabort DCD HandlePabort
MyHandleDabort DCD HandleDabort
MyHandleIRQ DCD HandleIRQ
MyHandleFIQ DCD HandleFIQ
ExceptionHanlderEnd
;*************************************************************************
;One of the following two routines can be used for non-vectored interrupt.
IsrIRQ ;using I_ISPR register.
sub sp,sp,#4 ;reserved for PC
stmfd sp!,{r8-r9}
;IMPORTANT CAUTION
;if I_ISPC isn't used properly, I_ISPR can be 0 in this routine.
ldr r9,AddrISPR;=I_ISPR
ldr r9,[r9]
cmp r9, #0x0 ;If the IDLE mode work-around is used,
;r9 may be 0 sometimes.
beq %F2
mov r8,#0x0
0
movs r9,r9,lsr #1
bcs %F1
add r8,r8,#4
b %B0
1
ldr r9,AddrHandleADC;=HandleADC
add r9,r9,r8
ldr r9,[r9]
str r9,[sp,#8]
ldmfd sp!,{r8-r9,pc}
2
ldmfd sp!,{r8-r9}
add sp,sp,#4
subs pc,lr,#4
AddrISPR;There is no this phrases in original 44binit.s
DCD I_ISPR
AddrHandleADC
DCD HandleADC
IsrIRQEnd
;****************************************************
;* START *
;****************************************************
ResetHandler
ldr r0,=WTCON ;watch dog disable
ldr r1,=0x0
str r1,[r0]
ldr r0,=INTMSK
ldr r1,=0x07ffffff ;all interrupt disable
str r1,[r0]
;****************************************************
;* Set clock control registers *
;****************************************************
ldr r0,=LOCKTIME
ldr r1,=0xfff
str r1,[r0]
[ PLLONSTART
ldr r0,=PLLCON ;temporary setting of PLL
ldr r1,=((M_DIV<<12)+(P_DIV<<4)+S_DIV) ;Fin=10MHz,Fout=40MHz
str r1,[r0]
]
ldr r0,=CLKCON
ldr r1,=0x7ff8 ;All unit block CLK enable
str r1,[r0]
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