sbl_init.asm-适合在编辑模式下看

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;******************************************************************************
;****************************************************************************
; Setup Reset Vectors
;****************************************************************************
下面的代码为arm模式
.arm

下面的代码属于ResetVectors段
.sect “.rstvectors”
.global _sblResetVectors

sbl程序入口，临时异象向量表
_sblResetVectors:

reset跳转到sblEntry
LDR pc, sblEntry ; Reset
临时异象向量表
B _sblLoopForever ; Undefined Instruction
B _sblLoopForever ; SVC call
B _sblLoopForever ; Prefetch abort
B _sblLoopForever ; Data abort
B _sblLoopForever ; Hypervisor
B _sblLoopForever ; IRQ
B _sblLoopForever ; FIQ

sblEntry表
sblEntry .long _sblEntry

;****************************************************************************
; SBL Entry
;****************************************************************************
.def _sblEntry
.ref _c_int00
.ref SBL_init_profile
.ref _sblTcmEn

_c_int00_addr .long _c_int00
SBL_init_profile_addr .long SBL_init_profile
_sblTcmEnAddr .long _sblTcmEn

_sblEntry:

读取cupid，不为ti的就跳到_sblLoopForever进入死循环
MRC p15, #0, r1, c0, c0, #5
BFC r1, #8, #24
CMP r1, #0
BNE _sblLoopForever

设置临时对战地址_sblTestStackBase-#0xf
ADR r1, _sblTestStackBase
BIC r1, r1, #0xf
MOV sp, r1

获取sbl启动的时间点信息，看sbl快不快
LDR r1, SBL_init_profile_addr
BLX r1

开开当前核的atcm和btcm，告诉内存让他们可以被使用
LDR r1, _sblTcmEnAddr
BLX r1

LDR r1, _c_int00_addr
BLX r1

开始进行fpu，各模式stack初始化
_sblLoopForever:
WFI
B _sblLoopForever

_sblTestStackTop:
.space 64
_sblTestStackBase: