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* Z2 ^' T+ @9 \$ L# O' L$ C在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
; h+ W' o* w# {/ F, i! U- M8 O/* 重新配置程序入口点 */. M3 U Q2 c X b: j/ C
-e Entry- /****************************************************************************/
0 _' g2 W8 Z2 \5 o: V - /* */
' q6 g. F& J6 w1 S5 D - /* OMAPL138 及 DSP C6748 内存空间分配定义 */, J* p& p) a( s6 Y7 x, W. Z5 Z0 Q
- /* */3 `. l w n4 C
- /* 2015年04月20日 */
6 D. z& m& V: S7 E, i6 p$ b4 r - /* */
# Y% M( [7 r) \2 Q - /****************************************************************************/& Q1 i1 C4 e x4 f. o, V
- /* 堆栈 */& {' X. ^: l! u& @' ?
- -stack 0x8000
' }* \) O- V' g. p$ l* p. F - -heap 0x2000
- T' \8 R8 k4 ]5 `. j J; x - ( m) T t! `! M. F2 B- X' } t) g
- /* 重新配置程序入口点 */1 m/ ^; c) ~: s/ ~9 T! O
- -e Entry
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7 {# d- L# X+ i# W( l# F8 z- MEMORY
# D7 `+ G! }; ]! A7 S9 ]! t: m - {
0 R- T) I8 H- U7 }. R - #ifdef DSP_CORE$ A8 ~! g' T t$ d9 G9 m
- /****************************************************************************/
5 Z. l: X) x p' g - /* */
Q6 k0 z6 N' a. x6 }7 t - /* DSP 专有内存区域 */+ Z! p2 E; n" e* @0 S
- /* */+ y1 j+ Q6 Y p: H! \, t d! d
- /****************************************************************************/
% A( L9 R- k/ d$ b: E: { - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */' g1 K7 m4 n- E$ y
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */2 x( r) A. ^: }" v1 E( E B4 b
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */7 `1 B- Q [% p' p- ~ h
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */2 Q3 K4 U1 T4 n) c6 D$ }7 `1 t
- #endif
复制代码 这是一段汇编代码用于切换到特权模式
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! l2 @6 N0 B1 T8 B; lOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm7 K' M3 h0 j8 g2 F% C/ G
- ;******************************************************************************# l% {+ B3 Z% h- e8 U( t: c4 S% x0 g
- ;9 J# l/ I4 t2 m# N2 @. y& Z8 j% Y% V
- ; init.asm - Init code routines5 j7 n- U+ W( j+ E
- ;: X6 j+ @! g+ z/ R; W5 ~. X5 e6 m
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
: R! Y2 d! C( J% D9 j9 t% m. ]6 H - ; All rights reserved.
( t# X3 e3 E& J4 b, S% @$ y - ;
3 S; ?, M+ I! T5 X6 K - ;******************************************************************************
2 ^) s! k) q- W0 o8 h; j: ~ - ;****************************** Global Symbols*******************************
" z+ y) D) w9 v) Y6 L - .global Entry
% c; A. r0 x; p2 x1 v, L2 V$ {2 n - .global start_boot1 G8 ^ v- w2 v: ]* ]
- .global __TI_auto_init
3 C2 P% A' ?) \# c
% a$ u/ Z* q* W* s2 _- .ref __stack
8 t' x3 H; c( b2 g - .ref __STACK_END
' R6 @/ \6 a4 {, _* C; m) U) B - .ref bss_start
/ W% P5 S" ^( {$ s* x' { - .ref bss_end
# k2 D/ B9 o2 Z7 U3 M, r - .ref start_boot
" \) x* j ^" l- w+ Q) S - ) L5 i4 y0 [$ `; H
- ;************************ Internal Definitions ******************************* ^: R& g6 V* x, L3 ^6 ^3 X
- ;
3 ~ U9 i7 c) j$ s - ; Define the stack sizes for different modes. The user/system mode will use6 Z9 L8 K& W$ q, D% F7 \) O1 D
- ; the rest of the total stack size
) X6 ^5 E9 q6 v0 ^: n - ;
5 `; Z c; W- \7 k* S: P - 2 B' k' A* o4 X _5 ~
- UND_STACK_SIZE .set 0x8# t8 @( K" P7 h
- ABT_STACK_SIZE .set 0x8
, O0 ?! K2 L( |7 U - FIQ_STACK_SIZE .set 0x8) W5 H, k: R, g4 k
- IRQ_STACK_SIZE .set 0x500
- o- ]! p. I9 Y" _6 G" w! f9 F - SVC_STACK_SIZE .set 0x8; Y: O0 s l6 h* s) e
- ) @0 l4 [8 y3 Z8 ?8 O# P- M. \' Z
- ;
0 j6 E$ S, \. b/ g5 _. `5 @; k - ; to set the mode bits in CPSR for different modes
; }% s; }$ e; v1 B7 y; U - ;# I8 t$ T; v. L D3 d/ i
- ' ^9 B. d7 z$ H! W: p6 g
- MODE_USR .set 0x10& p6 {' w3 q# D, [3 G9 E0 s
- MODE_FIQ .set 0x110 M! \1 S$ H* J
- MODE_IRQ .set 0x12
2 U, v. \. {; M$ A/ u0 A# V - MODE_SVC .set 0x13
, `: Z2 Z0 W0 [1 K3 c - MODE_ABT .set 0x179 E- r( C l+ V; {4 R1 V0 ?
- MODE_UND .set 0x1B
, E: I7 a+ _% y - MODE_SYS .set 0x1F
6 [8 N' Z. h4 T4 C1 Q6 e
7 g( m' z: ` A" O- I_F_BIT .set 0xC0
$ K0 M: k$ w; [4 }4 R3 A - " K- o1 u, t2 s5 i
- ;**************************** Code Seection ***********************************9 u1 z$ ]4 n9 g' F7 H) ~+ d
- .text* J+ Y: M4 n+ }: e1 S9 o- \
& i6 H1 q* \# y+ F- ;( [" X* @7 B, A* l, u- u1 M3 s3 C
- ; This code is assembled for ARM instructions
/ k5 z( I7 O8 [3 ^% s6 b" { - ;: a3 ~$ T+ k1 P
- .state32
+ E" d8 n* a/ B# _) g# w+ G - 5 Q% a$ ^9 N/ @/ Z- A
- ;******************************************************************************
9 ]3 _: C8 K& ]' d; d- B0 [9 T - ;
; o4 v0 r# z4 `. x* n' _# [ - ;******************************************************************************
( W. @6 v3 k- S5 [; k/ a( g6 p) D - ;; U d; {" C5 K+ n: k
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and
W2 ^2 y& B: g1 I6 P' s' ` - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the( D$ I% j1 B( P2 r+ a
- ; main() function.
6 C8 L. N/ O7 F - ;
# d6 \9 W) P5 h; j - Entry:! e6 v. Y5 c: _' u8 p
- ;* x) F: T; N' L; P
- ; Set up the Stack for Undefined mode
$ m2 ]' _0 y3 C3 Y/ ^' y9 C! Z - ;
% l* `6 O4 }) u. e' N - LDR r0, _stackptr ; Read and align the stack pointer; N a3 I6 o" P/ A- p1 u
- SUB r0, r0, #8
! N Q3 y6 g/ R& r& T5 _ - BIC r0, r0, #7- n: x, P" y8 @5 _/ t7 H
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
2 L: j5 ]- w3 `/ |/ |8 ?& r - MOV sp,r0 ; write the stack pointer
8 n. v& W; a& F - SUB r0, r0, #UND_STACK_SIZE ; give stack space5 g8 A: P) L; V1 t; P. s, N
- ;
* N$ t z8 L6 U/ J7 B - ; Set up the Stack for abort mode1 |/ u0 V& p0 _+ t# |1 |/ Q4 M
- ;& v+ Q. M: x7 m" P1 O+ B* X' O( r5 b
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
* f' H& x6 N: Q4 h - MOV sp, r0 ; write the stack pointer
/ v" K; v# }& s* a - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
' r! N# S7 P" K4 L* w - ;/ ~+ D; Y* j8 \; \4 L0 t8 L* ]
- ; Set up the Stack for FIQ mode& `6 ?! {, O7 T+ e
- ;
) g$ ^2 V* R2 e& B5 E - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode- \; y! h; v1 K! b! F8 b7 w6 H
- MOV sp,r0 ; write the stack pointer# L2 y6 i; c% _4 |7 } t
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space5 Q( T' Y n& G" U, S% X: |9 L3 F
- ;
' }0 j9 l6 y# c J - ; Set up the Stack for IRQ mode' _4 U1 y4 o7 W3 t( a* i0 Z, L
- ;! [8 Q6 ~+ Z1 a; J: U
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode: R6 O1 f& B9 k" Z) b7 C9 y
- MOV sp,r0 ; write the stack pointer
0 k B) e- B- h( w! l/ r2 I: y8 f3 m - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space* h- v. {4 J: ?6 U- ]' [0 C
- ;* ~* _) i. w( m8 N
- ; Set up the Stack for SVC mode
; E6 A' m& _+ D3 x% e - ;/ K& j* s0 m& j% d' ^8 r
- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
3 F4 w9 {! s3 s - MOV sp,r0 ; write the stack pointer
8 c' s" z s: | - SUB r0,r0, #SVC_STACK_SIZE ; give stack space. ~% e) ?4 M; H3 S
- ;$ k0 ^6 L$ D' l' j9 x1 R
- ; Set up the Stack for USer/System mode
6 S0 Q% {! K, {8 _9 U4 s - ;4 K8 K( \( E X1 a8 y
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode$ \) b1 G+ O7 H# m& ?
- MOV sp,r0 ; write the stack pointer
1 i5 N& B! q/ r: a: h( T: L2 h2 Y x - / V0 M8 F2 s" _0 Y' j) f
- ;
7 V' o/ _, K3 J, \ - ; Clear the BSS section here+ _9 v% a! d0 b: Y
- ;
. o; z3 M/ K, k0 P/ ? - Clear_Bss_Section:9 G$ S& J% t4 n4 ^/ \
* ~; {' U9 I t% z% X( V8 c x) C- LDR r0, _bss_start ; Start address of BSS
3 `3 f* y# } L7 o& h - LDR r1, _bss_end ; End address of BSS
. |4 n+ W& ?9 H2 {' V - SUB r1,r1,#4# g; u, t9 ?: }) o
- MOV r2, #0
& |; J p9 W7 f# T" A+ F - Loop:
2 s _( ^+ p2 z7 ]: O" S - STR r2, [r0], #4 ; Clear one word in BSS
7 H* S; f: q9 O h - CMP r0, r1
( O: a1 _0 j8 w, U) S1 U$ N3 _ - BLE Loop ; Clear till BSS end: U9 Q0 S& x( Q. W2 j n
( }4 G4 v$ o& |$ `4 [6 w- BL __TI_auto_init ; Call TI auto init: n" z# U c" K$ O
- " P7 p0 A- e J; P8 [
- ;
$ t5 b6 k B7 I6 S% `% D - ; Enter the start_boot function. The execution still happens in system mode4 H4 L1 W$ F4 C9 O5 @* ] E5 p
- ;' a3 ^: f4 r; w; `# a1 \/ g. K
- LDR r10, _start_boot ; Get the address of start_boot
7 M; {4 m+ I, J/ H - MOV lr,pc ; Dummy return o4 D$ t- F7 d# C! i
- BX r10 ; Branch to start_boot2 C) Q: q; @- ~$ \5 C& _4 E1 s
- SUB pc, pc, #0x08 ; looping
; U7 f0 l+ k- o7 n% G- i - ( K* k0 ~& e7 l& N1 x, B
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
) Q0 O, }3 z0 N3 n - ; BX lr3 E. J. U+ u9 T( D, R# @! M4 X
- ;" p" Y- j& |$ O3 I! z3 B
- ; End of the file- _8 c: p; d( h0 D6 x- T
- ;
4 V6 t3 k% O, [ - 7 ~; B- z- s, c. z/ i+ c8 ?
- _stackptr:
: Y& e8 d2 ^6 `# }) g - .word __STACK_END8 x1 q4 f" F( \. ?, X
- _bss_start:
1 j7 o* y6 T/ `' ~/ Y9 L - .word bss_start
4 H% B* I! d7 s& `5 B- D+ ^ - _bss_end:; ~4 M/ p [( i2 R" g9 F
- .word bss_end' r$ j( S6 I$ ~* m2 b2 A; z b
- _start_boot:9 l. k) |/ j2 n+ N( Q
- .word start_boot- {/ q' M6 X% t
- _data_auto_init:; \4 V' G- K& y& |' q* o# n" d0 U
- .word __TI_auto_init
" h( S5 L& N7 Z) J - .end/ k) H {5 A8 ^5 M2 {) V, X
-
2 l& c) u- @& G) S8 U - & o; {9 z9 B0 ]
$ b- Q" x6 m$ o# t
复制代码
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