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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
& ~' @( u, o( h* a- \" L. P' t7 ?/* 重新配置程序入口点 */
( p% h0 T3 e; U1 |9 L% F-e Entry- /****************************************************************************/
: H: F% m0 |5 T& v - /* */
0 ^' Y+ {- n( f# [ - /* OMAPL138 及 DSP C6748 内存空间分配定义 */
! c0 Z4 A1 ~* @" G - /* */
1 M- O2 b; l/ a! e" G - /* 2015年04月20日 */; Z) ?1 w7 n3 j) U3 J& f! h
- /* */
: }5 @: y" j! T - /****************************************************************************/
# d* J6 h6 N# @( T - /* 堆栈 */, A5 F) R1 P: b
- -stack 0x80009 ~+ R2 ~, `' ?: U( I! m
- -heap 0x2000
/ ^. d4 c; k, p- u. O, u) T
0 @8 a* Y5 P+ \* P: K3 v/ {- N- /* 重新配置程序入口点 */
# ]# a2 Q! J6 C( }" Q2 p - -e Entry
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- MEMORY
5 t# f6 k( F6 p: x% N6 H - {
! d& s; Z. V3 R) S. A; j" k - #ifdef DSP_CORE7 j& j. k& M' P O$ J+ y# v
- /****************************************************************************/
, Z9 o" K& v6 G' t9 }7 J2 V9 c* D% O) O - /* */
( t% J" o2 H8 W7 [ - /* DSP 专有内存区域 */
0 K4 j% A+ C8 W. C; t - /* */
o2 {: A: W' R9 g" ^4 S - /****************************************************************************/3 T7 i6 C- l# G1 B2 B
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */& o I" v# j+ a6 k; {7 ?
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
" z- H' g' U7 \! y" e3 J, h - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */1 X) s& t$ s+ i' ]$ U/ b
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */# _8 y* A8 Q. d( A2 z6 u6 e% Y5 Y
- #endif
复制代码 这是一段汇编代码用于切换到特权模式% b0 A* O4 g/ `- A7 Y6 ?2 m
' R, n$ M3 F0 D0 n9 ZOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
* }" K$ |0 q Q% j- ;******************************************************************************
: S2 T9 N- j2 p7 O9 b6 J- v k - ;/ i7 H; R( r% e, M6 Y
- ; init.asm - Init code routines
, l5 z( ]! q6 i/ O; M# F* Q: @" R, ] - ;
6 z- E n, g7 M( w7 X$ p8 M6 I - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
% {7 t! g+ C( l' x% y6 d& g/ r' S - ; All rights reserved.
9 E0 C) A/ M3 u/ _1 u - ;
! a1 @* E1 w9 P3 G9 d7 d - ;******************************************************************************
- ~! S2 q+ {( C, p; p: O9 [ - ;****************************** Global Symbols*******************************0 e1 e# b* x5 {; J O9 c" z% m
- .global Entry
- Q" k8 O$ ]& y& H5 V" h - .global start_boot1 Q$ y2 S& s8 ?( f/ P ~3 v# D
- .global __TI_auto_init
# h- K3 `% G; o$ M, m* n - ! Y8 p- v4 r# q% j3 e
- .ref __stack
9 \- n: G' z3 D0 ]( B" H' I - .ref __STACK_END
5 f5 _9 I4 l, o7 J6 ~5 ~ - .ref bss_start/ ?; \7 k7 S" ]7 t+ K& Y
- .ref bss_end
8 b0 |5 f# s; h% s9 P9 y E - .ref start_boot6 ?9 n W0 X- j: n& z5 W4 e
& U4 c7 L. {/ S% N; v3 D/ K+ H- ;************************ Internal Definitions ******************************
8 `+ t' G& A: D6 V& p - ;
5 l9 Q$ v& O9 K - ; Define the stack sizes for different modes. The user/system mode will use
: d# t; c$ y" p! f9 j& z - ; the rest of the total stack size0 B4 v+ v1 s% F# q
- ;
( G" y/ W8 T2 a! c$ m
) N7 a9 _: J. y( }$ A6 ?3 ~6 h- UND_STACK_SIZE .set 0x87 |0 h* d4 s9 H7 j- P
- ABT_STACK_SIZE .set 0x8# x& @% X! L( u. q1 B" S! U
- FIQ_STACK_SIZE .set 0x82 Q/ @, M0 ]0 I
- IRQ_STACK_SIZE .set 0x500
8 |" S6 h- B# ~' \# \ - SVC_STACK_SIZE .set 0x8
+ M- w! _6 q+ Y5 u* ?1 z( y8 ]8 Q - ( a0 U) P9 }5 x& s# c
- ;
, l+ ` C5 f# ?0 ^" v' L! p - ; to set the mode bits in CPSR for different modes
% n9 ]8 Z; |% a - ;
8 L: ^' J, E4 P/ h' m - - `( \0 G" T& p1 s2 I6 C* ]5 g
- MODE_USR .set 0x10
2 w# j0 {- f6 \% G$ z - MODE_FIQ .set 0x115 x% U7 b: z1 m: g
- MODE_IRQ .set 0x12
8 d, ^: H6 @" J3 V: p& o) Z% [* K# V - MODE_SVC .set 0x134 W! w7 v/ L' z- Q& G! b2 J
- MODE_ABT .set 0x17# F+ B$ `# [1 D2 w' \- M' V- A- s
- MODE_UND .set 0x1B% v: ]8 G" {* ?6 L9 D" `
- MODE_SYS .set 0x1F" {( @# p' t- {" n
5 D8 s& I W6 {0 a; K8 n- I_F_BIT .set 0xC0 E2 b- a/ b# g: M
- ) A5 X' o; |$ \! r$ R( C5 S
- ;**************************** Code Seection ***********************************6 h! ?6 ?! x3 ~. b
- .text4 I- P2 ~! E) ?, w! U3 K6 F
- 8 `* x. A! h2 i8 f: n f, R
- ;
! z2 Q4 G$ f+ t& H - ; This code is assembled for ARM instructions7 f. E7 k/ i Z! G- l" {
- ;7 j' R# Y- v& n3 l% ^6 }& l
- .state32
0 a! i S' P ]* E2 \ - . g7 i* f N; p; a
- ;******************************************************************************/ n- k) Z) h+ a- l
- ;
& D. j4 S) y1 | - ;******************************************************************************8 O' }5 c/ x1 a" ?
- ;
8 `: F! t5 {. I0 T; V1 ~1 D& a - ; The reset handler sets up the stack pointers for all the modes. The FIQ and5 A* {8 W/ y2 Z$ s% O! U
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
+ t7 h) c) C, Z: E3 a - ; main() function.
$ z, U' x& ~. B( b8 `2 D0 G# Z9 a - ;. s/ [" `1 q2 C7 {' c
- Entry:
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- ; Set up the Stack for Undefined mode
& O- L8 N" l D, ?$ |# s - ;5 M6 [6 q& ~) E
- LDR r0, _stackptr ; Read and align the stack pointer1 x( w9 j1 e; a9 B! G
- SUB r0, r0, #8
9 x- o) \1 D* S3 }/ Y+ \; P1 a: ^ - BIC r0, r0, #7. p3 C3 Q/ p- D
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode) m% [: w" T& |; @
- MOV sp,r0 ; write the stack pointer6 K5 R( f9 q# j, I% Q
- SUB r0, r0, #UND_STACK_SIZE ; give stack space
* M. [7 v3 V4 b; ? - ;
) @. N* x! }0 d0 N - ; Set up the Stack for abort mode
1 U8 j4 G. `* k. ]) n4 \, P1 R - ;. W. ^; E% ?$ g- |8 e
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode6 ]1 V5 n9 w U; w3 E: I
- MOV sp, r0 ; write the stack pointer8 W) G, s! d$ a1 c" x9 k% [+ h# w
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space9 |; s0 n2 S/ ?
- ;
# \" F* v1 R1 U - ; Set up the Stack for FIQ mode
3 _9 L( Y5 t/ m r - ;
& g/ s n( _0 |. w0 M7 Z! _$ d - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode% R* l0 B, }; ]: \1 ~- t
- MOV sp,r0 ; write the stack pointer
" B, N8 h# _' [! m - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space5 i( I6 x2 F' N
- ;
* i& d) ?2 H e$ B* m4 [' j. t - ; Set up the Stack for IRQ mode
6 T- Z6 \" Z+ E2 C - ;
: R4 H' g+ K& I' z6 _( f - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode1 v- t! V g6 X9 f9 f! v
- MOV sp,r0 ; write the stack pointer' r0 `8 e$ G; o
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
4 q" L$ u, Q# M+ G6 Z - ;6 s8 ?6 h$ l3 K. t
- ; Set up the Stack for SVC mode) o% w7 I, U. K8 Y) \& z7 c, i
- ;6 I% `3 `; t8 @- }( ]* e0 d( I
- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
. ]+ T: z M) F Q - MOV sp,r0 ; write the stack pointer0 @% i9 O9 w" W2 U/ i# L# u' A( l
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space8 A' V8 k0 b8 r* i$ ]
- ;
7 p' O4 p \( ? M2 Y; ^# u - ; Set up the Stack for USer/System mode
+ z$ K- h& K) o- a - ;7 ^1 n4 d+ b" o2 S" @. h% E y
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
; }9 P, ~' k+ A4 w+ { - MOV sp,r0 ; write the stack pointer
: w( y2 m" W- H; P/ S
4 K( G" }, m U8 K1 b) a0 d- ;
" g- Z6 }8 B$ e8 W# } - ; Clear the BSS section here/ w; E' |% E1 m, B8 c
- ;8 K) w B% Y/ m; |( u' q
- Clear_Bss_Section:# O) W/ x6 x5 U2 Z4 e8 Z" f
p( X. q6 |# k& g- LDR r0, _bss_start ; Start address of BSS% s! ?- O* s7 x7 N$ d6 r
- LDR r1, _bss_end ; End address of BSS
6 k( P. X9 c7 M' n - SUB r1,r1,#4
. `& i8 g. E% B# [1 l' a - MOV r2, #0/ G: E- ?5 W8 q" H% t8 j6 n
- Loop:
$ C' o1 L# p! N& n$ T; ~/ {" u - STR r2, [r0], #4 ; Clear one word in BSS
& m! ]- C2 I+ j% z - CMP r0, r18 p6 }# z- w( N7 A" q2 k
- BLE Loop ; Clear till BSS end
0 c: }' K+ T1 o J0 q& t1 L0 ^% A- A - % K4 V* [ A9 ?' n5 g
- BL __TI_auto_init ; Call TI auto init6 X( E0 ?, X5 m
- ) f" |; e" c4 F' q) q
- ;1 P, A u) s4 R- C0 G, x" t" \# N; z
- ; Enter the start_boot function. The execution still happens in system mode& p: s7 ]7 h! V6 m: e" A& w
- ;
7 t3 M1 w. i2 @2 k$ o2 y - LDR r10, _start_boot ; Get the address of start_boot+ X9 X3 K4 H( }$ c; d
- MOV lr,pc ; Dummy return
( ^5 N4 F2 F% _8 G3 m0 s! i6 S - BX r10 ; Branch to start_boot- E9 v; E5 X5 \: g: v; |- h
- SUB pc, pc, #0x08 ; looping
/ ?3 s) q" s& f/ }" |/ q
$ u8 y8 @7 q% N) p- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode e9 ]( j5 z/ K3 \
- ; BX lr( Z+ ]& L1 b) G- z) Q! A* ^- O
- ;
, U* u @! w5 P! m1 n' P - ; End of the file
8 G+ C- T( ?9 v/ ?: i - ;8 D' `2 X# g8 U2 F& A, D, C' I
- ' ^, }% m6 a9 s& ^
- _stackptr:
6 g( z2 M8 a1 _9 Y7 I- ? - .word __STACK_END
5 z$ g* I. ~- v I8 z0 t9 n2 z9 P - _bss_start:
6 Y7 {( ]5 ~5 I& c - .word bss_start+ E( O3 M0 l3 A" c4 l; d: e
- _bss_end:
: B. k' L7 j0 T- y) n - .word bss_end. g- Q4 C Z3 e( I; Q
- _start_boot:
: ^; d8 j) O8 Y. A3 C - .word start_boot: m, y& V( Y5 G9 [ g
- _data_auto_init:; F2 X1 W: ^2 c6 b" W% v/ f5 ^! l
- .word __TI_auto_init
) t' H0 ? Y6 c4 [ - .end
) |! n8 w6 A1 B - 6 G7 p. l6 `/ w2 |
- # H0 Z4 b% R) x+ J; e
- " r- p3 G, ?' ], p" r
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