?? 44binit.s
字號:
; *******************************************************
; * NAME : 44BINIT.S *
; * Description: *
; * C start up codes *
; * Configure memory, Initialize ISR ,stacks *
; * Initialize C-variables *
; * Fill zeros into zero-initialized C-variables *
; *******************************************************
INCLUDE option.s
INCLUDE memcfg.s
;Memory Area
;GCS0 FLASH 1m*16bits=2M BYTE----------------[0x00000000-0x001FFFFF]
;GCS6 SDRAM 4banks*1m*16bits=8M BYTE---------[0x0C000000-0x0C7FFFFF]
;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
[ {CONFIG} = 16
THUMBCODE SETL {TRUE}
CODE32
|
THUMBCODE SETL {FALSE}
]
[ THUMBCODE
CODE32 ;for start-up code for Thumb mode
]
MACRO
$HandlerLabel HANDLER $HandleLabel
$HandlerLabel
sub sp,sp,#4 ;decrement sp(to store jump address)
stmfd sp!,{r0} ;PUSH the work register to stack(lr does not push because it return to original address)
ldr r0,=$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
ENTRY
b ResetHandler ;for debug
b HandlerUndef ;handlerUndef
b HandlerSWI ;SWI interrupt handler
b HandlerPabort ;handlerPAbort
b HandlerDabort ;handlerDAbort
b . ;handlerReserved
b HandlerIRQ
b 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
;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 is not used properly, I_ISPR can be 0 in this routine.
ldr r9,=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,=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
;****************************************************
;* 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]
;****************************************
;* change BDMACON reset value for BDMA *
;****************************************
ldr r0,=BDIDES0
ldr r1,=0x40000000 ;BDIDESn reset value should be 0x40000000
str r1,[r0]
ldr r0,=BDIDES1
ldr r1,=0x40000000 ;BDIDESn reset value should be 0x40000000
str r1,[r0]
;****************************************************
;* Set memory control registers *
;****************************************************
ldr r0,=SMRDATA
ldmia r0,{r1-r11}
ldr r0,=0x01c80000 ;BWSCON Address
stmia r0,{r1-r11}
;MRSR register must not be reconfigured while the code is running on SDRAM
;****************************************************
;* Initialize stacks *
;****************************************************
ldr sp, =SVCStack ;Why?
bl InitStacks
;****************************************************
;* Setup IRQ handler *
;****************************************************
ldr r0,=HandleIRQ ;This routine is needed
ldr r1,=IsrIRQ ;if there is not 'subs pc,lr,#4' at 0x18, 0x1c
str r1,[r0]
;********************************************************
;* Copy and paste RW data/zero initialized data *
;********************************************************
LDR r0, =|Image$$RO$$Limit| ; Get pointer to ROM data
LDR r1, =|Image$$RW$$Base| ; and RAM copy
LDR r3, =|Image$$ZI$$Base|
;Zero init base => top of initialised data
CMP r0, r1 ; Check that they are different
BEQ %F1
0
CMP r1, r3 ; Copy init data
LDRCC r2, [r0], #4 ;--> LDRCC r2, [r0] + ADD r0, r0, #4
STRCC r2, [r1], #4 ;--> STRCC r2, [r1] + ADD r1, r1, #4
BCC %B0
1
LDR r1, =|Image$$ZI$$Limit| ; Top of zero init segment
MOV r2, #0
2
CMP r3, r1 ; Zero init
STRCC r2, [r3], #4
BCC %B2
[ :LNOT:THUMBCODE
BL Main ;Do not use main() because ......
B .
]
[ THUMBCODE ;for start-up code for Thumb mode
orr lr,pc,#1
bx lr
CODE16
bl Main ;Do not use main() because ......
b .
CODE32
]
;****************************************************
;* The function for initializing stack *
;****************************************************
InitStacks
;Do not use DRAM,such as stmfd,ldmfd......
;SVCstack is initialized before
;Under toolkit ver 2.50, 'msr cpsr,r1' can be used instead of 'msr cpsr_cxsf,r1'
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