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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
# b3 u% U% h* v% O7 ~/* 重新配置程序入口点 */
. b" k/ i1 ^* d. W-e Entry- /****************************************************************************/
4 }1 r2 r% i3 o" ~0 Y. n6 p! ` ?0 U - /* */" H0 W+ r4 K p$ y) j2 y5 U
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */
4 v7 Z! s8 E3 n# j6 H2 G - /* */2 g6 o) z" j! o" _/ H v4 L+ }+ Z
- /* 2015年04月20日 */
0 q; i& f v$ D0 i- |( G - /* */. ^* S; C/ s9 Z7 p" n0 o, r
- /****************************************************************************/5 w* Q- e( O& g1 }1 L: |7 k
- /* 堆栈 */! }/ \( E+ b& ^
- -stack 0x8000
7 c+ m3 y8 Y7 U: n C/ I5 Q - -heap 0x2000
# _/ T! N- p2 K3 `
k h/ m! Q4 U' v; g* m- /* 重新配置程序入口点 */$ |- q0 M* y. u; Q
- -e Entry% E; w J# T2 T1 @2 [2 D
- 1 G/ U. W& Q2 U' i* A3 l3 M: L
- MEMORY6 W' R' Y% |& H8 m3 X) a1 X
- {2 Z- F! M) x6 m6 Y( v; H" p1 J
- #ifdef DSP_CORE
5 h$ V, T3 K( m( i* ~ - /****************************************************************************/0 y! J8 k, T: z4 f, W
- /* */
{4 M9 v' [' k6 z( \- W - /* DSP 专有内存区域 */
+ g9 @. b v3 l- O2 x" B+ E - /* */
2 H. r: \! ]9 D3 ` - /****************************************************************************/- ?- r8 x/ z' Q6 @7 O: t: _% A
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
- u9 q3 \; G F/ B( R$ N - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
+ [% t5 F9 V' x - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */- q5 w0 K& t: K1 g6 m: N
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
& O. q" Q+ S5 p- q" X( d2 Z0 M - #endif
复制代码 这是一段汇编代码用于切换到特权模式5 S" c8 h3 H: Z9 Z$ A, b' n. y+ X
- H7 n9 ^+ q2 n7 }# m# ZOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm% I; {! v8 P4 [# A
- ;******************************************************************************/ o- r! m' M1 _, ?# ^6 t% b% E
- ;
Z `6 q9 _! Q- z6 { - ; init.asm - Init code routines
' o0 ~6 I9 F. r0 G+ r - ; ~# ]* A" V( g- s4 H
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/8 n5 Z+ A0 k8 ]7 @" B
- ; All rights reserved.) u5 L) I( u- v2 p/ Q6 l7 D" b" v
- ;
% l) ]( t; G3 u; I0 a) V( b3 i - ;******************************************************************************
0 D% d5 o; t9 L8 e8 S& w1 y - ;****************************** Global Symbols*******************************) n- E5 H) W- b m! }
- .global Entry4 Y" @3 ]" q9 F
- .global start_boot
0 G, T! b2 @5 V& ^ - .global __TI_auto_init9 \$ E" c' }) w2 L# `& A
- 7 {) @! M+ i8 m- v
- .ref __stack
B q% J3 c& d* t. O+ ` - .ref __STACK_END
9 m' o2 `$ E( r9 S% W - .ref bss_start P5 d( g. D0 L! x
- .ref bss_end
# @6 D8 S5 V8 T: f - .ref start_boot9 s$ r7 {# Y4 S4 C* v% Z
- 5 {2 i0 n% y$ }- \! i# I1 h! R
- ;************************ Internal Definitions ******************************6 [3 c+ h: A7 D+ s+ m% }1 c
- ;
. C9 b4 l: @8 u% I* B - ; Define the stack sizes for different modes. The user/system mode will use
" j. U2 x3 k3 U& I |# Y* f - ; the rest of the total stack size( x1 b7 Y! y5 l- a8 I
- ;
. Q' {) }7 }. w! P7 ~ - 1 y9 _1 D9 D, M. b" r
- UND_STACK_SIZE .set 0x8
# Z* O( U T! @6 ~ - ABT_STACK_SIZE .set 0x8
4 [/ B4 c1 h0 z' N - FIQ_STACK_SIZE .set 0x87 _( r. F9 x: u/ ]: a7 p
- IRQ_STACK_SIZE .set 0x500
7 _ ~ C0 {5 t3 r - SVC_STACK_SIZE .set 0x8$ u7 x* P% T+ j! Z
# J5 i+ m8 y0 e" ]- ;
& e9 J# U% C; R - ; to set the mode bits in CPSR for different modes
: y* R4 O" N* _$ l8 X - ;
2 i; `4 p0 }8 s K$ {1 f& m+ [) P
6 B5 r7 S" u9 Q1 M5 J; q- MODE_USR .set 0x10. J( a9 i9 r* d2 G7 u
- MODE_FIQ .set 0x11" B; A1 X& Q) s" ?5 e
- MODE_IRQ .set 0x125 W3 q' O$ @" W( z8 i% ^' x
- MODE_SVC .set 0x13) C/ T% }8 W8 d' Y# S3 t, Y6 D1 f5 _
- MODE_ABT .set 0x17
/ N, a( @9 D. Y. D, I* Z; D, K - MODE_UND .set 0x1B
. f9 T# C* P4 w4 N - MODE_SYS .set 0x1F
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/ j. d4 z. D% \; w+ c. z- I_F_BIT .set 0xC08 ]( p7 b7 ^2 E0 k5 A
' o, L/ E, W7 w( d' A3 x& _- ;**************************** Code Seection ***********************************
( n( n- R1 d7 x, c# J - .text; E+ X+ a# ^# j* l# R+ C
- 1 t$ P9 m2 e* y2 m: v8 n
- ;3 Y5 P) G. K2 a
- ; This code is assembled for ARM instructions& l+ @1 Q. G2 J/ n" d2 `" _
- ;7 B0 _/ k* m, @' d
- .state32
3 `2 b8 e' H$ A
% \. U- ~. W% s- ;******************************************************************************# m( |3 I ?& I Z, \3 e
- ;. i6 L& b5 H% z# o* i- E
- ;******************************************************************************
p- U6 O9 G3 r* L" z - ;! m& O, P5 Y9 {8 {6 f
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and
, ?5 ~* p! s; }3 _" m - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the) h; z' z. u3 d; V
- ; main() function.
- `5 F R% {1 d% M - ;; h( Q) V1 G, e& Q
- Entry:: d( O, x6 B/ V9 z$ |$ _' G% Z
- ;
+ [& q9 n, Y/ u" r; R" I6 H' ] - ; Set up the Stack for Undefined mode
# k" Z: S, _6 r/ v- H3 H - ;
! Z9 ^! \, d1 X, M3 |: C - LDR r0, _stackptr ; Read and align the stack pointer1 n0 @3 W) B1 N0 k4 R0 N
- SUB r0, r0, #8
8 Q. I+ B- O/ ^ - BIC r0, r0, #70 p [) E6 q V9 ~- Q# n( s- b, S v
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode2 u" r7 h% L5 A1 U
- MOV sp,r0 ; write the stack pointer' s* y# A8 E) b- ~3 u2 M9 d0 B' C" ^$ o
- SUB r0, r0, #UND_STACK_SIZE ; give stack space8 F9 R5 o, w' w
- ;
6 m, f9 t+ z' O5 p4 _" n - ; Set up the Stack for abort mode
9 `) L: @( p" @4 @4 A& O4 }% T0 j - ;
! V$ S1 e" w9 {/ v# K0 b - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
1 |5 E4 n$ r7 w - MOV sp, r0 ; write the stack pointer
0 P* a% c8 O) p2 O H* ^4 J7 @ - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
2 s" T8 g& ]; _9 h( [8 G - ;# Q+ ], e. v& w/ b' [
- ; Set up the Stack for FIQ mode5 f r B* W( j, t+ I, d7 s4 Y5 q" I
- ;. Q* a1 R% i# u: `, v# |% q! r: `
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode+ [2 ^5 k# _: I$ ?
- MOV sp,r0 ; write the stack pointer
: r, U4 W: N4 [: @5 g1 v - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space9 n( d3 |' j, x0 Q! b
- ;/ S0 z, b: h0 m+ K: x: I2 W- p
- ; Set up the Stack for IRQ mode R# H& Z1 e* A! e9 e
- ;
2 \7 L: D# V" V+ v U( G5 e8 a - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
" _5 y- u; }% V( F4 d, M - MOV sp,r0 ; write the stack pointer
6 S* v# A6 p# b u5 x; O, h4 Z - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
9 R O; P( Q1 Y+ c) c' |9 T - ;( f* h$ D8 H; f
- ; Set up the Stack for SVC mode
1 n! H# H: g) _# x) d, B - ;- y7 ]5 l. m- {- X
- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode# T0 O+ R( P3 I; `' v% q% R
- MOV sp,r0 ; write the stack pointer1 e; Y8 X2 ]' Y! o6 D
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space0 A6 W2 g; E! r% Z
- ;
% g% X! r: E" h6 o; ` - ; Set up the Stack for USer/System mode9 E2 G+ m2 C9 B1 l/ \9 @
- ;
) P6 {+ U; V% C - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode! ]" F1 E2 e' M# T9 m! x
- MOV sp,r0 ; write the stack pointer
$ y# P% Q8 @# k; H
2 u$ ?. \/ J8 d p% X4 Q$ ^! E- ;
3 }% f% O( R- [7 ?' Q - ; Clear the BSS section here
* H8 K, `1 \7 V! J1 y, o- U9 Z7 v - ;
! W* N/ r; s4 i" [) N" g% h5 ?: ` - Clear_Bss_Section:+ v. V' Q1 N4 I+ |
- & N" w9 n* I4 y0 \+ {: i, R
- LDR r0, _bss_start ; Start address of BSS. Y" ]; C/ I7 `% X( O
- LDR r1, _bss_end ; End address of BSS
4 M! {5 J+ a; D7 \& F6 g( P6 O - SUB r1,r1,#4) D2 b( w4 s6 ~7 V& G6 A
- MOV r2, #0! u3 D$ F* P; f) ]
- Loop:
. h2 z* \( @* W, E9 K, b5 S - STR r2, [r0], #4 ; Clear one word in BSS
9 y$ R! a @( c1 \' S' K) G - CMP r0, r1
3 E' \. L6 E3 D0 X - BLE Loop ; Clear till BSS end' i; R. }; a1 c' w4 L7 ?: B7 I
- ; [: X3 A* c0 @9 y+ u
- BL __TI_auto_init ; Call TI auto init# Z( ^! A$ O* P; P6 O
- 7 C: n& l# Y" q8 w" k
- ;
1 C7 a, m+ m7 v8 B. y) ? - ; Enter the start_boot function. The execution still happens in system mode
9 I+ y. U* P- W3 [ - ;
2 m: @& y$ [; n. t) B - LDR r10, _start_boot ; Get the address of start_boot
9 n6 m1 j. ^. _8 x Q) \ - MOV lr,pc ; Dummy return
, [ W) U, _( Q4 i - BX r10 ; Branch to start_boot
; t# g8 C2 \' [9 o6 H0 X" n - SUB pc, pc, #0x08 ; looping8 ?* R D4 H, p( {3 c0 P
5 `: s- ^5 s' P- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
- G. L2 J, ?+ `8 ?4 v4 O9 _ - ; BX lr! j7 ?& C0 R. Y' D- s3 ~$ x9 i" W
- ;/ @* ?) n0 {0 w
- ; End of the file
! @; L+ O8 u9 |- ^ Y" o - ;
# I. \6 ^6 |5 m1 T" D2 \) T - 1 y. m6 Y3 Z( r; y
- _stackptr:* v4 m3 w7 ~+ X$ P5 Y3 w& f p
- .word __STACK_END
0 a& U T1 Y! _( H) B2 b8 `6 _ - _bss_start:9 F0 ?7 j& w& H
- .word bss_start
+ @7 @! C% ]- K/ Q7 `! }3 i8 i - _bss_end:: p# p) s& n& F$ w, s. h
- .word bss_end
1 _# A0 R& D7 t: z - _start_boot:4 H9 U c! z% W4 z+ n8 N N \
- .word start_boot
* q& ?! t; i3 Y! I" a. S - _data_auto_init:) U! n U- w+ O& D+ |
- .word __TI_auto_init
8 i. ]" } z, x( R+ q: n. P4 ] - .end" N8 A# Z. R. _, C' C
- * `9 q/ ~4 p* m) N2 Z
1 o/ |; v, f' D1 f! L
9 p$ u* B; E- k2 J k7 w% E+ D
复制代码
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