📄 44binit.s
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; *****************************************************************************************
; 版本号： 2004-04-10
; 描 述：
; C 启动代码
; 配置内存、初始化 ISR 及堆栈
; 初始化 C 变量
; *****************************************************************************************
GET option.s
GET memcfg.s
; 内存区域
; GCS6 64M 16bit(8MB) DRAM/SDRAM (0xc000000-0xc7fffff)
; 应用程序 0xC000000 ~ 0xC7EFFFF
; 44BMON 0xC7F0000 ~ 0xC7FFFFF
; 堆栈 0xC7FFA00
; 中断控制
;---------------------------------------------
INTPND EQU 0x01E00004
INTMOD EQU 0x01E00008
INTMSK EQU 0x01E0000c
I_ISPR EQU 0x01E00020
I_CMST EQU 0x01E0001c
; 看门狗定时器
;---------------------------------------------
WTCON EQU 0x01d30000
; 时钟控制器
;---------------------------------------------
PLLCON EQU 0x01d80000
CLKCON EQU 0x01d80004
LOCKTIME EQU 0x01d8000c
; 内存控制器
;---------------------------------------------
REFRESH EQU 0x01c80024
; BDMA destination register
;---------------------------------------------
BDIDES0 EQU 0x1f80008
BDIDES1 EQU 0x1f80028
; 预定义常量
;---------------------------------------------
USERMODE EQU 0x10
FIQMODE EQU 0x11
IRQMODE EQU 0x12
SVCMODE EQU 0x13
ABORTMODE EQU 0x17
UNDEFMODE EQU 0x1b
MODEMASK EQU 0x1f
NOINT EQU 0xc0
; 检测check if tasm.exe is used.
;---------------------------------------------
GBLL THUMBCODE
[ {CONFIG} = 16
THUMBCODE SETL {TRUE}
CODE32
|
THUMBCODE SETL {FALSE}
]
[ THUMBCODE
CODE32 ;Thumb 模式的启动代码
]
MACRO
$HandlerLabel HANDLER $HandleLabel
$HandlerLabel
sub sp,sp,#4 ;减小sp(用于保存跳转地址)
stmfd sp!,{r0} ;PUSH 工作寄存器到堆栈(lr does't push because it return to original address)
ldr r0,=$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 ;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
;下面的两个例程之一能够用于非向量中断
IsrIRQ ;使用 I_ISPR 寄存器.
sub sp,sp,#4 ;为 PC 保留
stmfd sp!,{r8-r9}
;IMPORTANT CAUTION
;if I_ISPC isn't 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
;****************************************************
;* 复位异常处理，同时也是系统程序的入口点 *
;****************************************************
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-r13}
ldr r0,=0x01c80000 ;BWSCON Address
stmia r0,{r1-r13}
;****************************************************
;* Initialize stacks *
;****************************************************
ldr sp, =SVCStack ;Why?
bl InitStacks
;****************************************************
;* Setup IRQ handler *
;****************************************************
ldr r0,=HandleIRQ ;This routine is needed
ldr r1,=IsrIRQ ;if there isn't '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 ; 注意：此处调用 Main 而不是 main()
B .
]
[ THUMBCODE ; Thumb 模式的启动代码
ORR lr,pc,#1
BX lr
CODE16
BL Main ; 注意：此处调用 Main 而不是 main()
B .
CODE32
]
;****************************************************
;* 堆栈初始化函数 *
;****************************************************
InitStacks
;不要使用DRAM，如：stmfd、ldmfd、.....
;SVCstack is initialized before
;Under toolkit ver 2.50, 'msr cpsr,r1' can be used instead of 'msr cpsr_cxsf,r1'
mrs r0,cpsr
bic r0,r0,#MODEMASK
orr r1,r0,#UNDEFMODE|NOINT
msr cpsr_cxsf,r1 ;未知模式
ldr sp,=UndefStack
orr r1,r0,#ABORTMODE|NOINT
msr cpsr_cxsf,r1 ;Abort模式
ldr sp,=AbortStack
orr r1,r0,#IRQMODE|NOINT
msr cpsr_cxsf,r1 ;IRQ 模式
ldr sp,=IRQStack
orr r1,r0,#FIQMODE|NOINT
msr cpsr_cxsf,r1 ;FIQ (快速中断) 模式
ldr sp,=FIQStack
bic r0,r0,#MODEMASK|NOINT
orr r1,r0,#SVCMODE
msr cpsr_cxsf,r1 ;SVCMode
ldr sp,=SVCStack
;用户模式没有被初始化
mov pc,lr ;The LR register may be not valid for the mode changes.
;****************************************************
;* 进入省电模式 *
;****************************************************
;void EnterPWDN(int CLKCON);
EnterPWDN
mov r2,r0 ;r0=CLKCON
ldr r0,=REFRESH
ldr r3,[r0]
mov r1, r3
orr r1, r1, #0x400000 ;允许自动刷新
str r1, [r0]
; 等待自动刷新处理，可能不需要，如果其它总线控制器持有总线，则 mov r0, r0
nop
nop
nop
nop
nop
nop
nop
; 进入 POWERDN 模式
ldr r0,=CLKCON
str r2,[r0]
; 等待直到进入 SL_IDLE、STOP 模式并唤醒
ldr r0,=0x10
0 subs r0,r0,#1
bne %B0
; 从 DRAM/SDRAM 自动刷新模式中退出
ldr r0,=REFRESH
str r3,[r0]
mov pc,lr
LTORG
SMRDATA DATA
;*****************************************************************
;* Memory configuration has to be optimized for best performance *
;* The following parameter is not optimized. *
;*****************************************************************
;*** memory access cycle parameter strategy ***
; 1) Even FP-DRAM, EDO setting has more late fetch point by half-clock
; 2) The memory settings,here, are made the safe parameters even at 66Mhz.
; 3) FP-DRAM Parameters:tRCD=3 for tRAC, tcas=2 for pad delay, tcp=2 for bus load.
; 4) DRAM refresh rate is for 40Mhz.
;bank0 16bit BOOT ROM
;bank1 8bit NandFlash
;bank2 16bit IDE
;bank3 8bit UDB
;bank4 rtl8019
;bank5 ext
;bank6 16bit SDRAM
;bank7 16bit SDRAM
[ BUSWIDTH=16
DCD 0x11110101 ;Bank0 = 16位，BootROM(AT29C010A*2) :0x0
| ;BUSWIDTH=32
DCD 0x22222220 ;Bank0=OM[1:0], Bank1~Bank7=32bit
]
DCD ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC)) ;GCS0
DCD ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC)) ;GCS1
DCD ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC)) ;GCS2
DCD ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC)) ;GCS3
DCD ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC)) ;GCS4
DCD ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC)) ;GCS5
[ BDRAMTYPE="DRAM"
DCD ((B6_MT<<15)+(B6_Trcd<<4)+(B6_Tcas<<3)+(B6_Tcp<<2)+(B6_CAN)) ;GCS6 check the MT value in parameter.a
DCD ((B7_MT<<15)+(B7_Trcd<<4)+(B7_Tcas<<3)+(B7_Tcp<<2)+(B7_CAN)) ;GCS7
| ;"SDRAM"
DCD ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN)) ;GCS6
DCD ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN)) ;GCS7
]
DCD ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT) ;REFRESH RFEN=1, TREFMD=0, trp=3clk, trc=5clk, tchr=3clk,count=1019
DCD 0x10 ;SCLK power down mode, BANKSIZE 32M/32M
DCD 0x20 ;MRSR6 CL=2clk
DCD 0x20 ;MRSR7
ALIGN
AREA RamData, DATA, READWRITE
^ (_ISR_STARTADDRESS-0x500)
UserStack # 256 ;c1(c7)ffa00
SVCStack # 256 ;c1(c7)ffb00
UndefStack # 256 ;c1(c7)ffc00
AbortStack # 256 ;c1(c7)ffd00
IRQStack # 256 ;c1(c7)ffe00
FIQStack # 0 ;c1(c7)fff00
^ _ISR_STARTADDRESS
HandleReset # 4
HandleUndef # 4
HandleSWI # 4
HandlePabort # 4
HandleDabort # 4
HandleReserved # 4
HandleIRQ # 4
HandleFIQ # 4
; 不要使用标识 'IntVectorTable'，因为 ARMASM.exe 不能正确识别该标识，其值可能与你想象的不同
;IntVectorTable
HandleADC # 4
HandleRTC # 4
HandleUTXD1 # 4
HandleUTXD0 # 4
HandleSIO # 4
HandleIIC # 4
HandleURXD1 # 4
HandleURXD0 # 4
HandleTIMER5 # 4
HandleTIMER4 # 4
HandleTIMER3 # 4
HandleTIMER2 # 4
HandleTIMER1 # 4
HandleTIMER0 # 4
HandleUERR01 # 4
HandleWDT # 4
HandleBDMA1 # 4
HandleBDMA0 # 4
HandleZDMA1 # 4
HandleZDMA0 # 4
HandleTICK # 4
HandleEINT4567 # 4
HandleEINT3 # 4
HandleEINT2 # 4
HandleEINT1 # 4
HandleEINT0 # 4 ;0xc1(c7)fff84
END
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