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0 b+ P, n: z& S; b) M2 T在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句: l7 h: t5 ~+ _& |: g
/* 重新配置程序入口点 */5 Q: d6 F5 D4 U4 c
-e Entry- /****************************************************************************/
" W! Z5 @. @: u! G1 p E - /* */1 R" h y5 O3 Y3 J8 D. d
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */; E7 ^( O' ]( P1 U5 g
- /* */
$ g( k. j0 c7 H$ ?, Z - /* 2015年04月20日 */
- ~4 N! |0 L9 p4 i y - /* */5 F" p8 `6 V D4 t- M
- /****************************************************************************/
! w5 i9 x* Y; B - /* 堆栈 */$ m2 f4 `* V0 l7 B! K
- -stack 0x80006 M, E4 H% w! |
- -heap 0x2000' e, E" [3 \+ H6 @' h
2 G# D% Q- v, X; a: R3 b3 |- /* 重新配置程序入口点 */
* P' W. ^' K, z - -e Entry, s/ g$ ~( w" I- P) w; [
7 r, E7 l7 O& g- MEMORY
3 y' C7 o3 U9 ^ s5 e2 ^ - {
6 h8 h# g% }( n - #ifdef DSP_CORE- K/ n; N+ t3 X
- /****************************************************************************/
% P# o6 z& G) x: ~3 l( y3 Q - /* */
( b# S" K0 W4 z0 z/ v8 X+ v - /* DSP 专有内存区域 */
& u2 t4 o& F% o! W- N( B - /* */# i9 @7 E6 e1 i9 W! P- A6 i
- /****************************************************************************/
, m' b& B; T7 {3 f5 f, _ l) A - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
+ m/ z$ R7 f; s - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */, z; W! T# @" q4 T
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
1 b' }0 J/ A/ c3 _- u1 z - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */# I2 ~9 Y g( w% d- }& {
- #endif
复制代码 这是一段汇编代码用于切换到特权模式 I' M4 K" {* }# n
: |# ?. }* [6 P; g NOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm9 k7 t) w/ o3 p8 o5 m
- ;****************************************************************************** `! E3 y+ B9 I( U
- ;
2 e+ O3 k9 o! D% |6 t" Y1 {' O - ; init.asm - Init code routines
" [: I8 q! G9 S, z/ E, p- | - ;
' ]5 z) U& z, D. ?4 I% ]! @ - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/1 M6 J( `& V1 N6 K+ a6 U) {$ m
- ; All rights reserved.
: J A, J6 k: `) K - ;
, k# z* @! Q4 \- K+ l# } - ;******************************************************************************
H9 N v& Y6 x# a7 k8 q* N - ;****************************** Global Symbols*******************************
6 u: B: w& n5 s' s- U - .global Entry6 W$ i6 `) \3 o: [0 }3 O d0 ^ L3 Y
- .global start_boot5 I" ~2 Q6 A' W% S3 K
- .global __TI_auto_init
3 C+ z2 e# M2 I$ t7 q
k$ O, o3 M" V: H+ _6 l. K1 ?$ r0 F- .ref __stack
$ `0 [; A5 ^% b, L- F/ m/ V0 q. T - .ref __STACK_END
7 q2 {1 p# E# V/ b. c+ t- Q - .ref bss_start
5 O d; ^, i1 g9 ~ - .ref bss_end
4 d( `! Q- n4 Y- [" r% ` - .ref start_boot, B5 p6 w# [+ j6 c
- 4 m: C2 F% C- ?: p+ ~$ B
- ;************************ Internal Definitions ******************************1 y' O" Y' F$ n
- ;
: {& M$ t* w. } - ; Define the stack sizes for different modes. The user/system mode will use, }+ T7 r1 s" S1 d7 Z2 J% V/ y
- ; the rest of the total stack size1 w, Y/ l2 D2 h9 }
- ;
# M7 K1 d v o3 V" V* R. c* m
0 y3 Y3 c5 {; s! W2 O. F% U1 i- UND_STACK_SIZE .set 0x8! l$ @ u% n# W I3 `3 X* E [
- ABT_STACK_SIZE .set 0x8+ g& h3 I4 o% Y
- FIQ_STACK_SIZE .set 0x8
4 R) ?5 f2 p( a6 @: \/ u/ g - IRQ_STACK_SIZE .set 0x500$ R+ t, J2 Q4 I' }- O5 |. Z
- SVC_STACK_SIZE .set 0x8
; R# j( ?* X4 T+ G% }4 D - 6 d2 n( G, o- r- G% @
- ;- z4 q$ c- y- ~8 F% L
- ; to set the mode bits in CPSR for different modes
% \/ ]8 m6 w7 S - ;# V( u$ `, Q6 e3 }; Y2 c/ a
) d3 ^" U8 B, I+ |$ D3 K8 y- MODE_USR .set 0x10
/ h1 v$ ]6 s& T - MODE_FIQ .set 0x111 d" X. w! P D! x
- MODE_IRQ .set 0x12: H- Q1 S: O, r" d0 F$ _
- MODE_SVC .set 0x13: ~5 s/ t+ I r# X/ Z) G2 q: n @
- MODE_ABT .set 0x17
; E4 F. a M$ Z' ~7 m! N - MODE_UND .set 0x1B
0 v, J+ a) x! a6 k+ K; r2 e* q - MODE_SYS .set 0x1F
( w1 H: t F ^ - 4 u4 @/ @& {# X' D4 z
- I_F_BIT .set 0xC0
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- ;**************************** Code Seection ***********************************' ?0 [5 c# n6 X' u, d
- .text
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- ;
! ` ^& R: H+ R, m. e9 x) P - ; This code is assembled for ARM instructions
& C; y- `+ Q* W* _* b - ;
1 e$ N6 H! I- L1 J3 S+ n4 d - .state32! {3 l4 m8 U0 o( l
, g: S& H) s' Q+ ^5 o- ;******************************************************************************
j4 ], o$ g4 r4 ^" U; y - ;# ?! q) X7 R. K! a
- ;******************************************************************************8 u! {( A$ Z- ~& A
- ;
3 J5 N T* g* k0 r4 A - ; The reset handler sets up the stack pointers for all the modes. The FIQ and7 @3 y* F- Q L
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
0 @1 M, M2 S) Z/ k7 r - ; main() function.
1 e% ?' Z% w$ n: X - ;
B/ u9 l3 k8 f1 {) W/ W; l2 k, m8 p - Entry:; u, k2 v" Z7 j
- ;
- w+ ` X- C0 X5 b - ; Set up the Stack for Undefined mode
5 X' ]6 ]) F- u+ j& M - ;
! H9 v z# Q( M% g6 k2 }( L - LDR r0, _stackptr ; Read and align the stack pointer. C: t: p6 _" X# a! |/ o p
- SUB r0, r0, #8
: u* U' R3 B; j - BIC r0, r0, #7& r2 r& _$ h% C1 L% {0 T
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode0 v* C2 [& a+ @; U. B/ U
- MOV sp,r0 ; write the stack pointer% m6 a* P! a; Y `- s6 D
- SUB r0, r0, #UND_STACK_SIZE ; give stack space
p& k) Z; {" g4 S/ Z; [ - ;, s) ]. N7 w3 J0 H, _, l4 X) y, D
- ; Set up the Stack for abort mode
! }) T5 c# T" F( z: r% X - ;, x. p( ?3 ]( o. @9 T, N
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
S9 v; x9 J! P/ Z - MOV sp, r0 ; write the stack pointer
0 w$ v8 H0 H E+ R7 D0 Q - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
$ T* p6 u* b+ n- ~' D+ C9 U - ;
: y- g( B" {: X) M2 n; R - ; Set up the Stack for FIQ mode1 K# D/ x' i8 z; a% N4 l5 U
- ;8 P; z6 e, w( R2 f
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
2 p o! g" u* j - MOV sp,r0 ; write the stack pointer
! z W# `- N c! n7 M - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
A# \' D3 }( e! l0 w - ;, v5 G; V N$ Y4 |* x) j
- ; Set up the Stack for IRQ mode
9 P5 n" C+ l& Q3 o- Q - ;
/ l0 ?8 _; D* O: u4 Z, V2 U - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode2 D4 l* D( l5 w: C7 d: `9 [
- MOV sp,r0 ; write the stack pointer. l2 N; ?3 Q$ r/ d+ L8 Q8 O! z
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
' B) q0 X2 S8 @+ h1 f8 I' i5 p - ;0 d" Q5 ~3 G1 q- O+ n
- ; Set up the Stack for SVC mode
( T( o( o! |5 ~, h! i - ;- u7 r+ z3 H- A* |4 a
- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode9 O- s4 f* E2 k( a4 N
- MOV sp,r0 ; write the stack pointer6 t, V% ~9 ]. K2 Y) y
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space
2 @ s2 g7 |9 c - ;* ^# q% W/ {; h9 O" D- M* s% H$ p
- ; Set up the Stack for USer/System mode
+ o4 s! R, c9 x3 W - ;
) {$ w1 ~% z5 b- }- B A - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode/ ?1 t/ z7 e/ @+ ?7 I& P
- MOV sp,r0 ; write the stack pointer4 y% \; G9 v0 \) [0 x
- 0 u2 O% L+ W8 `2 ~1 Z
- ;5 ?# D0 v! ]1 ^. ~; N
- ; Clear the BSS section here' G- r6 ?8 R! y7 m2 e( T% n: u# e
- ;
; o# I3 x* V) ?" I: o - Clear_Bss_Section:: F8 T( d* j4 g% c1 o! k8 `
5 r8 {& [" m0 s, C1 ~1 j" d: S- LDR r0, _bss_start ; Start address of BSS
) J3 m/ v- A( h$ ` ]1 m. c - LDR r1, _bss_end ; End address of BSS
% }. K6 z9 l( I+ a( I - SUB r1,r1,#4
! V- V7 r, T$ b: W - MOV r2, #0
* w9 b3 ^% ~) L, r4 Q+ j - Loop:
, r6 g& }, @# v+ h; H - STR r2, [r0], #4 ; Clear one word in BSS: Z( T$ Y* H, I, V/ _* @/ F
- CMP r0, r1% X, A' k% W W% r
- BLE Loop ; Clear till BSS end J _; h( L1 X: l5 R% o
- * b, n; J: f& {6 c+ @4 N6 t
- BL __TI_auto_init ; Call TI auto init; i C( O/ @6 k3 Y8 O
/ V& P2 `. _7 c' `* t- ;
* p. n r+ a5 H8 G - ; Enter the start_boot function. The execution still happens in system mode
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- LDR r10, _start_boot ; Get the address of start_boot
- F' h0 G" J! O% |. ^9 @ - MOV lr,pc ; Dummy return 9 }" Y, B4 K4 F( ?5 G6 d& v
- BX r10 ; Branch to start_boot
8 [3 u, H& @) p* f' D - SUB pc, pc, #0x08 ; looping5 j: D0 L+ y: ^8 A
- 5 ]) M+ N0 @. r
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode; \( B' A" n" N+ H: p
- ; BX lr
$ j0 m$ b) p6 l, S# x; P - ;
" p4 k+ X( S% h3 i+ H; U" |' S - ; End of the file
! q/ Q5 @6 `3 k9 _/ ] - ;
4 E* Y" h& R) i* L" I" J# c/ U' t - 6 K3 t$ n) Y4 D) J$ H! ~2 N
- _stackptr:
) I1 M* X1 u! Q6 G( o - .word __STACK_END
2 B/ w! `) {5 K8 X% C - _bss_start:% [, \. i; e- e: f6 a. p9 T
- .word bss_start
b8 F; n4 W( U, M0 e1 V/ \ - _bss_end:
9 @; U6 s- {" ^* s - .word bss_end
% J0 f8 p% B7 C; B9 {$ \/ U - _start_boot:
. R& ^" K. B; S/ l9 U8 M/ a+ v L - .word start_boot; j- T, [4 t/ y! D
- _data_auto_init:+ C1 _; N* L S# a
- .word __TI_auto_init
* [4 V6 D; L- B; Z - .end. H& n' W0 O7 A# R
- , L9 _* W% W1 M! f; x3 ^
- ; d) W( [( Z* A I" E: _# D
- . D% a: Y. e# C) ?' m8 {/ D' z* O5 _
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