📄 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 *
# *******************************************************
.include "./include/option.a"
.include "./include/memcfg.a"
#Memory Area
#GCS6 64M 16bit(8MB) DRAM/SDRAM(0xc000000-0xc7fffff)
#APP RAM=0xc000000~0xc7effff
#EV_boot RAM=0xc7f0000-0xc7ff000 // if EV_boot
#STACK =0xc7ffa00
#Interrupt Control
.equ INTPND, 0x01e00004
.equ INTMOD, 0x01e00008
.equ INTMSK, 0x01e0000c
.equ I_ISPR, 0x01e00020
.equ I_CMST, 0x01e0001c
#Watchdog timer
.equ WTCON, 0x01d30000
#Clock Controller
.equ PLLCON, 0x01d80000
.equ CLKCON, 0x01d80004
.equ LOCKTIME, 0x01d8000c
#Memory Controller
.equ REFRESH, 0x01c80024
#BDMA destination register
.equ BDIDES0, 0x1f80008
.equ BDIDES1, 0x1f80028
#Pre-defined constants
.equ USERMODE, 0x10
.equ FIQMODE, 0x11
.equ IRQMODE, 0x12
.equ SVCMODE, 0x13
.equ ABORTMODE, 0x17
.equ UNDEFMODE, 0x1b
.equ MODEMASK, 0x1f
.equ NOINT, 0xc0
.macro HANDLER HandleLabel
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) */
.endm
.extern Image_RO_Limit /* End of ROM code (=start of ROM data) */
.extern Image_RW_Base /* Base of RAM to initialise */
.extern Image_ZI_Base /* Base and limit of area */
.extern Image_ZI_Limit /* to zero initialise */
.extern Main /* The main entry of mon program */
/* IMPORT Test */
.text
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,=HandleEINT0 /*mGA H/W interrupt vector table */
ldr pc,=HandleEINT1 /* */
ldr pc,=HandleEINT2 /* */
ldr pc,=HandleEINT3 /* */
ldr pc,=HandleEINT4567 /* */
ldr pc,=HandleTICK /*mGA */
b .
b .
ldr pc,=HandleZDMA0 /*mGB */
ldr pc,=HandleZDMA1 /* */
ldr pc,=HandleBDMA0 /* */
ldr pc,=HandleBDMA1 /* */
ldr pc,=HandleWDT /* */
ldr pc,=HandleUERR01 /*mGB */
b .
b .
ldr pc,=HandleTIMER0 /*mGC */
ldr pc,=HandleTIMER1 /* */
ldr pc,=HandleTIMER2 /* */
ldr pc,=HandleTIMER3 /* */
ldr pc,=HandleTIMER4 /* */
ldr pc,=HandleTIMER5 /*mGC */
b .
b .
ldr pc,=HandleURXD0 /*mGD */
ldr pc,=HandleURXD1 /* */
ldr pc,=HandleIIC /* */
ldr pc,=HandleSIO /* */
ldr pc,=HandleUTXD0 /* */
ldr pc,=HandleUTXD1 /*mGD */
b .
b .
ldr pc,=HandleRTC /*mGKA */
b . /* */
b . /* */
b . /* */
b . /* */
b . /*mGKA */
b .
b .
ldr pc,=HandleADC /*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 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 l2
mov r8,#0x0
l0:
movs r9,r9,lsr #1
bcs l1
add r8,r8,#4
b l0
l1:
ldr r9,=HandleADC
add r9,r9,r8
ldr r9,[r9]
str r9,[sp,#8]
ldmfd sp!,{r8-r9,pc}
l2:
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]
.if PLLONSTART
ldr r0,=PLLCON /* temporary setting of PLL */
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