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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句6 i9 G* x3 j; x% w4 P) h
/* 重新配置程序入口点 */ L; W: j/ T2 [7 z& ]
-e Entry- /****************************************************************************/& S+ u/ y3 Q; P" t1 o0 y
- /* */$ C0 S( v. m( X& h( g7 i
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */+ y! x, C" j# y2 F- g
- /* */8 J7 @# ^" e- j. Z* Z* Z
- /* 2015年04月20日 */
" }3 Z! q; c4 Y - /* */
/ G0 \: T, ~) U - /****************************************************************************/# E. B8 T& w0 z
- /* 堆栈 */
" c& s. `( e4 j5 e - -stack 0x8000
) }2 q! G1 u! Y8 o; a E - -heap 0x2000+ l U& L1 v; i2 S
- ; a( {8 X' i- `, ~
- /* 重新配置程序入口点 */
8 C3 t. i1 b% Z4 P7 ^* I0 Y2 r - -e Entry/ P- R: G6 y" W9 d( B
~& d0 ^! x: f2 [& R+ _" R- t( a4 k- MEMORY9 n `: ]/ G3 a! D
- {- W; ]* ?5 a: O/ h1 V
- #ifdef DSP_CORE
* R+ J1 J/ t* R1 B - /****************************************************************************/9 X5 g& B2 s& C
- /* *// Q$ f& _, o, ~+ k$ p; W! l
- /* DSP 专有内存区域 */' d$ m- g& ?) I$ E; G" M
- /* */; K% w/ P% P( C$ R- n0 x6 n
- /****************************************************************************/
: V Q) l' T8 l7 l' D - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */; }9 h# X" `8 S% n" \
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
% ~" j# [, Y0 A+ K/ j) u# e - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
% _: k7 o( i/ u# w r9 n - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
+ r7 }5 [% p* k - #endif
复制代码 这是一段汇编代码用于切换到特权模式: o T5 n0 B, @! W
' ~4 i! T" t0 |- {" y9 }$ pOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
6 w$ s5 O1 ^5 n, {, C- ;******************************************************************************
* y( c' Y. _, @6 N3 w( j - ;
3 A+ O% t L7 ]% t, t - ; init.asm - Init code routines1 n, G- y0 K! k& A( o
- ;
1 U" G. A' ?$ J9 v0 B( d - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/: Q. @6 g5 r) S1 w; ^
- ; All rights reserved.
7 {# p1 P$ V0 B2 i# P - ;
9 ^) `) ]/ N, \ v8 ~" ~% a - ;******************************************************************************
- F. w8 s' i% H - ;****************************** Global Symbols*******************************; Z6 Q) {/ R1 E+ T. Z
- .global Entry
8 O- H$ F; w W8 l0 e2 O - .global start_boot5 J1 G! T8 Y5 a" p) @& j4 h
- .global __TI_auto_init
/ O2 |. C. p' G4 [ - & s! B' X5 m2 K
- .ref __stack
$ d E. M6 G: Y0 R4 ? - .ref __STACK_END+ q) Q; A+ Z' ]6 B+ S- X6 t) R
- .ref bss_start, w4 `2 q1 ^- j. Q2 W+ t
- .ref bss_end. P! b" w. J4 k# A) x+ y
- .ref start_boot
; r; H& Q$ a; ?4 p - $ Q6 l6 O3 E6 g
- ;************************ Internal Definitions ******************************. a' M1 }* Y$ z" g
- ;
7 D0 n7 x0 ?+ B' H - ; Define the stack sizes for different modes. The user/system mode will use8 [/ j) {! _9 F/ A
- ; the rest of the total stack size, W. U& s; j6 F3 A! _
- ;! }/ u6 v7 @( d; W! d. H9 z* u1 G7 v
- 2 y+ ?7 G' @4 `% D
- UND_STACK_SIZE .set 0x8
7 _4 e/ E. M q7 v6 c" q - ABT_STACK_SIZE .set 0x8
7 {1 ]* P) p( @4 X - FIQ_STACK_SIZE .set 0x8( Z# j8 N" v8 g+ |
- IRQ_STACK_SIZE .set 0x5005 |0 D Q# S# H, d D0 m
- SVC_STACK_SIZE .set 0x8, ?# R: h3 g& b* h( ~1 w
/ f7 z3 s5 C5 {3 u- ;% U! n5 I) z7 E/ h. L
- ; to set the mode bits in CPSR for different modes
4 i* E4 v! l+ ~4 M2 {: V0 j - ;+ F! i$ ]* k& d1 o
! e- X S: g8 D5 S- MODE_USR .set 0x10
$ K a7 w7 i( U+ d4 {$ |% b2 x - MODE_FIQ .set 0x110 a; k- |$ @1 Q- a( w
- MODE_IRQ .set 0x12/ d$ p1 t: G2 W' w" w% }8 m ]' S
- MODE_SVC .set 0x13$ \$ ~7 F# }, A+ u. |
- MODE_ABT .set 0x17 p* S. U# O! f
- MODE_UND .set 0x1B) b; M0 x: s% }# L$ X9 T( ?
- MODE_SYS .set 0x1F H; t" b2 k. U/ E) S6 C) E8 o( B
8 `- b( ]' @3 j3 t( N- d- I_F_BIT .set 0xC04 A' O7 h# [9 F
7 E, U: H2 D! y- ;**************************** Code Seection ***********************************
2 R% m& P( L& `) a' k: Z3 z1 N0 z - .text: E0 B/ s7 `! F' t, O
- # }) F9 D; P) \, p& o& [! i
- ;- t8 \/ N$ a" q. L, o6 [: t* s
- ; This code is assembled for ARM instructions3 Y- G: m: ]1 ?; P/ h ~' f
- ;: ]) e7 o- O9 H/ o* O( b) f2 X
- .state32
M+ Y. I+ `' W- x1 Q - / t5 d( w, X# h: j. V
- ;******************************************************************************8 X! x Z( v. H! I
- ;( X1 A9 d/ R, \2 X# A6 F
- ;******************************************************************************
" P+ J& R- ^# [9 h0 K( }, }/ W* K - ;
/ m( D( j, g0 c+ y- w - ; The reset handler sets up the stack pointers for all the modes. The FIQ and
5 A4 b5 V6 L4 Y8 V I5 y, v - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
# L: h X9 `# @$ ~4 z5 i - ; main() function.
9 g9 e$ U6 G2 n; l% Y1 | - ;
' B1 q7 p9 ]( e1 y' ~& J8 O - Entry:
+ p1 B( _, I2 G1 |. V - ;9 v$ P, b6 z# G- I; v0 B
- ; Set up the Stack for Undefined mode* [; b. w8 Q; a
- ;
0 m9 k4 t# L2 l; U - LDR r0, _stackptr ; Read and align the stack pointer
+ }; `- f" H8 U# U& n6 F& V - SUB r0, r0, #87 Z. ~4 s9 Q0 u% t9 M2 Z3 ~
- BIC r0, r0, #76 c7 {( }; h, e2 J+ {: L/ D
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
/ O$ a7 [6 z, d# @" s9 S3 p' L: d - MOV sp,r0 ; write the stack pointer
( `! j! v. s/ n+ R0 l% W$ e - SUB r0, r0, #UND_STACK_SIZE ; give stack space
) {. `1 c: ]0 O% ^3 ^6 w" [( [ - ;7 E, f5 S' u( _* E. W! h" q+ P3 h8 ^
- ; Set up the Stack for abort mode* q/ U6 ]1 x; h
- ;
! P) ?# a; |& ]% k3 n - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode* b# R0 S' O. s' D7 z: ?' T
- MOV sp, r0 ; write the stack pointer
X2 M& V7 [; b6 b6 J8 _+ S - SUB r0,r0, #ABT_STACK_SIZE ; give stack space7 p2 j9 }5 @! z) Q& w( ~4 c
- ;0 a( c5 F9 }9 A3 q$ ]
- ; Set up the Stack for FIQ mode, j/ `$ `: W6 J9 B1 }
- ;. X1 B: L# b0 w9 `2 u/ P
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
& S( u+ S1 `/ n - MOV sp,r0 ; write the stack pointer
* K0 |/ x( P' P0 X. {# e - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space: u5 C. X1 I" C. ?% }$ i5 U5 w
- ;
4 E7 V6 f( v) y; R' i+ J - ; Set up the Stack for IRQ mode
% A3 T- H2 k! Q6 Z( G - ;/ b) `' Z' I z/ G- r( c
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
+ ~: c! J8 ^2 P - MOV sp,r0 ; write the stack pointer; L* K' u7 u2 y/ H. ?
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
) w3 g6 E6 M: s6 O8 t - ;& {9 ]: O- z% ?3 d5 h9 N5 r
- ; Set up the Stack for SVC mode
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- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode0 ?% z3 ~4 v+ U) x3 E
- MOV sp,r0 ; write the stack pointer
% x4 P0 z6 C* A" x( f" ^- t - SUB r0,r0, #SVC_STACK_SIZE ; give stack space' Q [: H) j$ p5 h
- ;* {& R, H, I8 ]
- ; Set up the Stack for USer/System mode
$ G5 n: q( O3 o: Y. O/ x - ;
: a- `1 b# z+ f1 ?" d - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode& @7 V1 X4 X! F+ m' s1 D
- MOV sp,r0 ; write the stack pointer
9 R: c7 J D1 W8 Z8 j. d* Y" u - ( f9 N. n6 t1 T( D
- ;
) P4 P, J4 o& i' n, A/ L E - ; Clear the BSS section here
/ J. [9 u, Q' ^% O" V - ;
: j& s, a; d5 J/ C! z% r- B! _ - Clear_Bss_Section:% I7 T2 e& U3 p) {8 i, R& m
( n; \* }5 e7 h8 a# `5 H) V6 N4 h' ?- LDR r0, _bss_start ; Start address of BSS
4 [. f% J0 C) B, X - LDR r1, _bss_end ; End address of BSS1 M2 K1 n9 q. [2 Y$ j6 \1 f
- SUB r1,r1,#4# O9 D! A" m2 n! S
- MOV r2, #0
- W: z9 S+ z6 _7 S! U - Loop:( w2 a9 r# y8 D, o6 b! w1 g3 u
- STR r2, [r0], #4 ; Clear one word in BSS
7 Z) [$ Y x) c6 y4 ]1 y' k - CMP r0, r1$ Z( P$ F' ]% B/ ^& h/ t3 J0 y
- BLE Loop ; Clear till BSS end
3 z- p# ~, S$ Y( E A7 V - # `! @; O6 V1 W% J$ D
- BL __TI_auto_init ; Call TI auto init
( V2 Z. C+ ?4 n; o0 h t
8 ~, H; W& l6 N' P- ;$ z: _" _0 B2 c" I9 k
- ; Enter the start_boot function. The execution still happens in system mode' d+ ]: B; F* z; l& J* V" F
- ;
' V; ^6 p0 Q( y - LDR r10, _start_boot ; Get the address of start_boot$ P# A9 d& U/ R$ d/ H8 |0 @ X+ b
- MOV lr,pc ; Dummy return : d6 L& d( L" V
- BX r10 ; Branch to start_boot
9 ~- Q; _7 L9 N+ f5 Z - SUB pc, pc, #0x08 ; looping0 U! O# G p* F! R
: i7 B# P# I. c" ^- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode. o' r' z2 G6 Z/ Z; y
- ; BX lr7 z' N$ i5 v1 k
- ;% S3 u9 ?9 j# C
- ; End of the file
a: {& G& c; i, g; T8 S# n1 k - ;& @, h$ z4 Z" m- ]2 L- I$ _" O
9 Z7 o) w9 s! i: }- _stackptr:$ L4 \6 `. M" r0 G$ b" F
- .word __STACK_END
2 }# z f0 |# r/ j - _bss_start:
% v3 s$ w; I" L( Z9 p- Y - .word bss_start" `1 g; g. A1 D( Y4 L. x6 V
- _bss_end:$ I4 v) H8 p+ X" f1 K
- .word bss_end
! g9 w7 Q- `' |/ R9 ]8 g - _start_boot:1 T R: E: K j- Z. ~/ F9 l O
- .word start_boot$ G% n# A9 B" O
- _data_auto_init:9 u( J) p* O6 k* ^1 }& [" [
- .word __TI_auto_init7 k. U k8 d: d/ l U6 z" Q( z/ [
- .end
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复制代码 " k2 f% {- Y# o8 x
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