📄 44binit.s
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; *******************************************************
; * 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 *
; *******************************************************
;********************************************************
;Project :ARMTESTucos2.80
;No int vect at the beginning
;ATTENTION: b jump in 32Mb
;ADD FIQ
;ADD works of ucos in INT in this file
; INT will enter OS_CPU_IRQ_ISR or OS_CPU_FIQ_ISR and
;save the contexts first,then enter IsrIRQ or IsrFIQ
;to decide which subroutine should be used.
;********************************************************
;GET option.a
;GET memcfg.a
GET memcfg.s
EXTERN OS_CPU_IRQ_ISR
EXTERN OS_CPU_FIQ_ISR
GLOBAL IsrIRQ
GLOBAL IsrFIQ
;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_CMST EQU 0x01e0001c
I_ISPR EQU 0x01e00020
I_ISPC EQU 0x01e00024
F_ISPR EQU 0x01e00038
F_ISPC EQU 0x01e0003c
;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
MOV_PC_LR
[ THUMBCODE
bx lr
|
mov pc, lr
]
MEND
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
ENTRY
;****************************************************************************
; b ResetHandler ; Reset
; 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
;***************************************************************************
***************************************************************************
b ResetHandler
b HandlerUndef
b HandlerSWI
b HandlerPabort
b HandlerDabort
b .
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
;*************************************************************************
;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
str lr,[sp]
; 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
mov r10,#0x1
0
movs r9,r9,lsr #1
bcs %F1
add r10,r10,r10
add r8,r8,#4
b %B0
1
ldr r9,AddrHandleADC;=HandleADC
add r9,r9,r8
ldr r9,[r9]
;set ISPC to clear ISPR
ldr r8,=I_ISPC
str r10,[r8]
bx r9
ldmfd sp!, {pc}
; str r9,[sp,#8]
; ldmfd sp!,{r8-r9,pc}
2
; ldmfd sp!,{r8-r9}
; add sp,sp,#4
; subs pc,lr,#4
ldmfd sp!, {pc}
AddrISPR;There is no this phrases in original 44binit.s
DCD I_ISPR
AddrHandleADC
DCD HandleADC
IsrIRQEnd
;****************************************************
IsrFIQ ;using F_ISPR register.
sub sp,sp,#4 ;reserved for PC
str lr,[sp]
; stmfd sp!,{r8-r9}
ldr r9,AddrFSPR;=F_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
mov r10,#0x1
0
movs r9,r9,lsr #1
bcs %F1
add r10,r10,r10
add r8,r8,#4
b %B0
1
ldr r9,AddrHandleADC;=HandleADC
add r9,r9,r8
ldr r9,[r9]
;set F_ISPC to clear F_ISPR
ldr r8,=F_ISPC
str r10,[r8]
bx r9
ldmfd sp!, {pc}
; str r9,[sp,#8]
; ldmfd sp!,{r8-r9,pc}
2
; ldmfd sp!,{r8-r9}
; add sp,sp,#4
; subs pc,lr,#4
ldmfd sp!, {pc}
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