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1 e% l# ]: E9 f( n9 i6 w* }在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
) A% V4 ~' N' k1 C5 {5 j1 _1 x; E$ _/* 重新配置程序入口点 */
8 z, r7 \" L# R-e Entry- /****************************************************************************/
2 O, X' R* s+ P' Z+ d L - /* */
8 {. a2 b, _- w9 I. d; ^9 C. N n$ ~ - /* OMAPL138 及 DSP C6748 内存空间分配定义 */& v& d3 W7 Y/ k/ F E% v5 L
- /* */
0 d ~/ F$ |- \3 ^3 z+ @$ a - /* 2015年04月20日 */
0 E# J T3 Y4 W8 n( w1 t' j/ f# | - /* */
0 n/ X w8 M+ C' d0 H - /****************************************************************************/, \' m" H% \( h0 m: X- H
- /* 堆栈 */
6 t4 w# B: G4 X - -stack 0x8000
% D1 l) q) P) C: N8 { - -heap 0x20001 n4 N5 I! {" Y8 K5 `& \
$ G1 S7 q9 f/ z, C- ]; E- /* 重新配置程序入口点 */2 D/ }8 t# \ g6 B: _
- -e Entry2 l+ L9 v9 z; |, \) X( m
- ! I! Q' X9 F/ Q! D( c
- MEMORY
! |6 g+ a" q6 [1 e3 v - {2 o) ?! o2 D5 g
- #ifdef DSP_CORE L: ~; X0 K( q* r: Z2 P
- /****************************************************************************/
- _/ D. J& r! E" \5 a: N - /* */+ j) C% O- d1 F+ x8 R
- /* DSP 专有内存区域 */! z$ ~) x9 N* h0 }7 |) I* }, b& m
- /* */
2 P# g+ O( z( a( F - /****************************************************************************/ n9 F1 k+ R C& I' j: X! R/ i
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */4 U4 |) _. }) B
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
7 ~$ i7 O# T9 K9 M/ b3 _/ g - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
- `9 u& d9 y. G1 o+ B' E8 F - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
& E1 d$ p' A, E6 ^$ a6 y3 ] I - #endif
复制代码 这是一段汇编代码用于切换到特权模式1 u% N5 ]4 p0 [7 `. i
) ]! v$ X; W" s" |& r4 C0 BOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
0 p: R% N6 J% _2 U9 R- ;******************************************************************************3 U" ^6 {6 t: i! G; I
- ;4 m' I e/ i1 W) w
- ; init.asm - Init code routines
/ @9 Z: p) t# r. k: e - ;
$ b* w+ f9 _. h- h' }1 p - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
% N8 }1 C" d, z, B; k, m - ; All rights reserved.
) B% m9 H3 [7 O; q* p - ;
' o4 m+ x0 F) E! J( U - ;******************************************************************************6 v% S8 _. n, V: P4 o
- ;****************************** Global Symbols*******************************4 X& h9 k# ~/ x
- .global Entry h+ ]$ M# I6 v" w
- .global start_boot' z( ~6 N2 ~$ @$ n5 R
- .global __TI_auto_init
. p) r9 i2 K3 i; O4 j# p% T' n: c) C+ m$ z
' d$ p2 [) W! I* D2 ]7 ]& _& S# }* Z- .ref __stack
4 Y5 D- j- e- ] - .ref __STACK_END
( Z, j6 G2 c. t) ~( W - .ref bss_start
" M+ V2 a/ N8 P6 ]1 V - .ref bss_end2 y( W4 c% G' B1 E9 F; P/ Q: r9 K8 w* E
- .ref start_boot; v' {7 c" E0 j0 b
/ [1 v$ W- O8 N9 N' c) j+ g! x- ;************************ Internal Definitions ******************************
8 ?+ E) c Q1 e: H - ;- C5 r- V/ B1 x! d
- ; Define the stack sizes for different modes. The user/system mode will use
% P) J6 X% r2 J$ S - ; the rest of the total stack size) z! b5 l$ b. t
- ;0 Q2 S+ C. w6 C7 @
* x8 j: N/ ^& A7 x- B5 t, _- UND_STACK_SIZE .set 0x81 p/ p2 z3 j0 O+ p6 r4 W
- ABT_STACK_SIZE .set 0x8! e9 i$ `* y% ?* ^5 {0 t
- FIQ_STACK_SIZE .set 0x8
$ Q9 M1 i/ `; o" o5 a1 W5 c/ u - IRQ_STACK_SIZE .set 0x500
2 y4 H) y9 B+ y5 @& c1 z" n9 g - SVC_STACK_SIZE .set 0x8
# U4 ?: {0 k# S! e7 f! J5 T
+ q) D7 {& z! \- ;
% X' @8 h+ u7 { - ; to set the mode bits in CPSR for different modes
8 f( h' b0 |8 D8 u a% u3 y - ;
: y8 K' {* d. b+ H- I- q9 H* z# C/ T - ) ?7 G4 k: ?4 M+ o: [9 {
- MODE_USR .set 0x10
# i) s# I7 U' T1 u1 w: }* y% F! X - MODE_FIQ .set 0x111 }! b( ^& ]4 `) L) q8 l& Q5 s
- MODE_IRQ .set 0x12+ H0 n/ O& ]0 {
- MODE_SVC .set 0x13
2 V5 E3 [* x* q& d: h% x - MODE_ABT .set 0x17& E7 W# m9 X _
- MODE_UND .set 0x1B* U$ s" U' }# G: R3 V1 s9 M: _- f4 m8 w: z
- MODE_SYS .set 0x1F3 f, a2 [# J8 N" ^
1 L* B/ H7 i/ w! o- I_F_BIT .set 0xC0
7 b f* Z9 H( f* ^ - . m6 g7 ] _! _6 X* g5 Q
- ;**************************** Code Seection ***********************************: C% U& C6 h9 B% o4 f
- .text5 R; K d: R1 t/ h6 j! \
+ X7 F6 F; E: D- V' A* u T- ;
& B( M8 b1 c7 A2 h- J1 v - ; This code is assembled for ARM instructions3 k, l, \3 b% W
- ;+ `/ c, t, D- H* h8 M% I
- .state325 r% t* t& a, z( x) T+ J4 x
- / p( I$ @9 e& D3 \
- ;******************************************************************************
9 E7 B3 B ~9 l9 o - ;
. i! ^) E; U0 z! D- K7 d - ;******************************************************************************3 u) h4 G& c: I3 _& N
- ;
/ x- b* w2 v& H - ; The reset handler sets up the stack pointers for all the modes. The FIQ and1 y7 Z# T2 J4 l& C* E
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the: [5 {6 z/ G4 x0 R" V& Z
- ; main() function. s1 V9 W( _% n+ P: T: G5 d$ Y8 f
- ;
5 z3 O5 s8 U, R% A% q, _ - Entry:- t! _4 J* q! _9 h5 K$ q, r& o" C
- ;0 }: O8 c0 j9 u" J6 q- H: h' y1 s% b
- ; Set up the Stack for Undefined mode
5 Q; A+ T# R. o& @0 W - ;9 c4 a& Z) s# L
- LDR r0, _stackptr ; Read and align the stack pointer
4 \0 F/ Z$ _5 F* i5 `- {5 ^5 M, e - SUB r0, r0, #8
4 u$ S. o z+ M5 T7 X1 A8 |# e7 ] - BIC r0, r0, #7
; \( ?) M% m% j$ f3 {2 e) T' O - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
3 @! J2 @5 o5 p9 d3 t - MOV sp,r0 ; write the stack pointer
4 A% Q3 t# s( m8 I0 p% {9 _7 z: d, l, B - SUB r0, r0, #UND_STACK_SIZE ; give stack space
4 z, ]& Y+ C" ^: [ F; k - ;
; Y, k' r! q9 ~ - ; Set up the Stack for abort mode
- [9 w) x0 A" D; P: E4 E) a - ;8 H i" C* G, k |* B/ P2 _
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
$ C! e: T: V3 v+ j7 z' V - MOV sp, r0 ; write the stack pointer
7 I9 [ [* R+ E% L' d1 Y: } - SUB r0,r0, #ABT_STACK_SIZE ; give stack space( C6 M7 K3 h; f( U# l* f H4 S: F3 Z
- ;
. O! Y# G. ]9 k3 I. ~3 m8 d# o - ; Set up the Stack for FIQ mode
7 N. u. _& n; w$ p* D, @ - ;
4 z5 Q( |- G, Y" m: ~ - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode5 u4 s H/ ^1 H5 x! e& c
- MOV sp,r0 ; write the stack pointer& E! p w' C0 C( a2 ?( m
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space6 s5 J7 r7 k$ R. U* J
- ;
1 \+ x) p; j8 z( | - ; Set up the Stack for IRQ mode
( s; ]5 _; N9 f! \6 W3 V - ;
`- p- }9 y/ W% b9 e( q - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode" J, }5 v3 J3 E
- MOV sp,r0 ; write the stack pointer2 {5 M' I4 t8 D; K
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
, O- g, q4 A# L O - ; s6 M. m, \6 v/ k) ?7 c9 q/ ]
- ; Set up the Stack for SVC mode
5 o3 b/ C$ T. i2 t9 u - ;
! q; a; w) J& e2 i% `5 |5 }) C4 |. @ - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode0 f. t& x6 N) y* t: ~, Z" h5 T
- MOV sp,r0 ; write the stack pointer/ l( x9 E" H$ X4 c9 H) @
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space" b7 U9 V( Q3 P% b- N' S
- ;0 }% z: r1 w- Y& D. E
- ; Set up the Stack for USer/System mode% p, @% t1 e( D
- ;
* D) v+ Y5 ^; s8 M2 V/ e - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode; P- S* _! V- b$ k y& K F& O
- MOV sp,r0 ; write the stack pointer
0 ]+ T0 o7 c/ D$ f8 c* _! U; V3 F - : m0 H- O: b; p! j# g9 G
- ;
5 \ L5 R9 P) n z - ; Clear the BSS section here# s" f4 B/ O7 H! A- D
- ;
. L( w( o. N; L - Clear_Bss_Section:
' v$ Z' ]5 u5 E* u4 K3 |( f
& f6 R$ Z6 j% w% k1 w0 Q- LDR r0, _bss_start ; Start address of BSS& j! b: t0 b- [! a' q+ p+ b
- LDR r1, _bss_end ; End address of BSS/ |5 S3 Q# p( @
- SUB r1,r1,#4
+ ~# d5 J) x- U0 U, a - MOV r2, #0, _: ^) _% E, ?- D
- Loop:8 f/ e6 [2 a: N/ Y6 }# C4 V$ R
- STR r2, [r0], #4 ; Clear one word in BSS# o, u2 Q# O8 Q
- CMP r0, r1
. }+ n8 |# o n2 M( O6 ` - BLE Loop ; Clear till BSS end
0 Y- H$ Q2 p; ?- d- ?3 O% T
' x; o6 f8 y% l9 ?; g( P! W& N- BL __TI_auto_init ; Call TI auto init
- U5 Q1 E# Q( s* d$ ~
W0 ^+ Z5 L- w- ;
! N; q F) a9 i$ ~ - ; Enter the start_boot function. The execution still happens in system mode9 T4 a8 C0 A" W( J% ?/ m5 g( ]+ X
- ;
0 W D* p4 V% f" K - LDR r10, _start_boot ; Get the address of start_boot; N' B1 d v7 m9 A6 k
- MOV lr,pc ; Dummy return ' m T O: d+ r: B4 G
- BX r10 ; Branch to start_boot
2 R+ [" T4 q4 t4 a. c - SUB pc, pc, #0x08 ; looping( u: _& X* N8 _0 H5 O
2 W- f4 o9 H: R2 B! S: Q- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
" {4 A5 m/ ?# y5 w1 G1 A3 L - ; BX lr
7 G- h: M) C& ? - ;! v8 J# f, r V# K" T4 B
- ; End of the file
" q2 G8 @0 C0 I4 g6 _4 a6 j5 p - ;
7 l. j/ G6 u" i9 P! m5 E$ }; e( D - ( q- d% F$ g7 u# T. ?
- _stackptr:- M( k& ?/ I1 Y/ `. z
- .word __STACK_END* V, D/ j" N$ _( k% {$ `) J' j
- _bss_start:
4 f* W" L1 t' v3 p @- N6 t - .word bss_start
2 O6 r4 g6 I0 b. G. w - _bss_end:$ s5 ?0 b8 W E- W# U h% I. l
- .word bss_end, V1 ^9 K$ ~5 r* U e+ }6 r
- _start_boot:
- G( R: O# p- i - .word start_boot
; ?( E8 d" j$ Q. U0 b4 I - _data_auto_init:" s2 W6 P; k- U/ _9 ]7 a
- .word __TI_auto_init
+ c |3 Z/ d1 B* b! K ?6 ?1 W - .end
1 {9 ^: I# U' y" A" U5 R -
2 ]" @: D0 \$ j; h# t1 o9 J/ y - 8 w+ b- _: Z5 L/ X
5 \% B5 G& V4 d* R) N& V1 Y
复制代码 , S4 F) V+ i+ y( t5 a
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