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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
- D3 q; L9 O$ g* y* F) F3 i' M/* 重新配置程序入口点 */" C3 e; o: G/ @
-e Entry- /****************************************************************************/
7 w# ]& p' e6 e+ T2 E+ y. X- m - /* */7 h4 _3 H7 T! F8 Q7 s+ S
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */4 f' \' {! ^0 E: U0 Q8 J' d
- /* */
0 L$ |& [' A+ v - /* 2015年04月20日 */
$ j2 ~: t- F$ V/ c+ I4 ?' c2 O - /* */
" \& T- n- f$ W! F - /****************************************************************************/
4 m% l) V8 ?& w4 @ - /* 堆栈 */
( |+ t- z2 v& y: e4 `: ~ - -stack 0x8000
+ ]! i9 H6 v9 ?8 L* B - -heap 0x20006 \( \; M m: D& X8 @0 {
- d f: S& h4 U8 A% C
- /* 重新配置程序入口点 */- I) |; p* V) c
- -e Entry/ x8 [8 E, F9 Q5 Z. I. M7 k( ^+ b4 X
7 J4 ~3 c' Y, m- y. a- MEMORY# L) P( B) c) W+ d: u0 i* |
- {
4 m+ M H$ ^; p9 C# n& H" z" }8 k - #ifdef DSP_CORE
1 _9 n9 Y- e0 N% I$ v4 i, L - /****************************************************************************/( F7 @$ P9 E/ f0 n
- /* */7 u5 C8 |+ z* m7 K6 V
- /* DSP 专有内存区域 */. ~$ B& ]1 v2 X: Q6 S* n, s
- /* */
% V/ O0 n$ R8 v3 K+ L+ ^) G9 M - /****************************************************************************/$ X5 {2 T9 ]- \" w
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
! b, V% K& q7 l( w. K* } - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */% M& g+ A8 G" Q" O9 U; P( @: V9 e6 u9 [
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
5 h8 ~4 k4 L1 g( p3 Q - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
1 T1 P7 O7 ^1 r% J/ j - #endif
复制代码 这是一段汇编代码用于切换到特权模式7 u/ ^4 l, T1 w$ H
: c2 Q$ O& X& V/ y2 C) dOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm" ?6 e3 }& Z D# L
- ;******************************************************************************; B! e9 e# j, j8 U9 t9 z, Y& G- y& \
- ;
: B T( I: r; u# d - ; init.asm - Init code routines- X0 V: N& W' M% J3 y
- ;
- i+ v5 I c$ v4 b K - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
! n: w1 x$ G) y- X' |( w - ; All rights reserved.: l' O1 b* Y# S. |
- ;
6 `* G1 U& \1 O5 q# d- a- K - ;******************************************************************************
$ S+ Q7 J7 ]8 x( a3 K9 D - ;****************************** Global Symbols*******************************
( C9 e1 ^3 L1 A4 T9 I* t - .global Entry3 I. ^5 `$ J: \6 q5 A; V0 h
- .global start_boot+ ~. P$ H& R+ ^% f
- .global __TI_auto_init
1 ]2 p4 G! Z; _$ z( d: ^) f8 _3 z
0 K3 ^" \* |4 s, O/ N- .ref __stack
* ?* ]* B+ A5 o- P5 e - .ref __STACK_END
( b( B7 q; ?& r- w+ W - .ref bss_start5 c+ |5 ]4 Y2 J8 k3 J5 x
- .ref bss_end
* O1 g+ C) O- @' ~( ?8 i$ V - .ref start_boot
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" ^' ]1 B: x" B/ m7 I2 u- ;************************ Internal Definitions ******************************! C2 A- _9 C! Y! `% m
- ;
2 s4 z) N( r) }: k - ; Define the stack sizes for different modes. The user/system mode will use( Q, _2 P% Q3 w1 @) W/ O5 v4 X
- ; the rest of the total stack size0 q3 y) h# \$ h1 K" b
- ; C# {! Q' k! i) r
- : M0 ?0 h% C G" `
- UND_STACK_SIZE .set 0x8; K# m/ q/ e$ U% f, f" X+ Z
- ABT_STACK_SIZE .set 0x8# ?. K4 p, \ }+ o+ |2 b" @4 v" g# T0 d
- FIQ_STACK_SIZE .set 0x8 @& r' n0 C' U; {- i0 H8 Z3 @1 ?
- IRQ_STACK_SIZE .set 0x500
1 ^% C. I/ s# B f1 H - SVC_STACK_SIZE .set 0x8+ U0 F0 F/ n( u5 Z0 |7 k; N4 ? u
- % X; F/ T: Y1 p
- ;' ], U1 T/ w2 z: l
- ; to set the mode bits in CPSR for different modes! [! ]9 I) ]7 `" o
- ;) x/ s3 H2 e" ^- G
- : X" C: G5 m9 w8 n" l q% [
- MODE_USR .set 0x10
' y% v" y2 r& I9 G - MODE_FIQ .set 0x11$ p$ a$ E! v ~1 d1 ]$ d. Q
- MODE_IRQ .set 0x12/ M3 R6 f6 k$ D. g
- MODE_SVC .set 0x13# t+ S/ l; c" m. x& G
- MODE_ABT .set 0x17% X0 p8 p/ I& [; B! [
- MODE_UND .set 0x1B: e# n9 N8 V( H. x7 |: ]# U
- MODE_SYS .set 0x1F
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/ d/ `& I$ c, y- I_F_BIT .set 0xC0
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, s: d6 f; V- V5 }- ;**************************** Code Seection ***********************************
- Y- n8 N' x% _0 d1 ] - .text
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9 N) Q6 b* N- h* h* u* L- ;
" \7 b. C4 w" A7 K, @. L5 } - ; This code is assembled for ARM instructions
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- .state32
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7 u3 j4 F- E0 `5 y7 x- ;******************************************************************************7 E* H1 C) I! w5 w
- ;
7 D3 r) G1 J. P7 A: ?' p) v3 E - ;******************************************************************************
& {* l8 j7 n7 X8 [6 {4 I. ^: @4 V - ;
$ x& z6 L& c+ S6 g5 O9 l# b! s# O - ; The reset handler sets up the stack pointers for all the modes. The FIQ and1 P1 O' s/ N: S, q4 L# i
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
( `$ V( j3 K: I8 A4 b x - ; main() function.6 t' s$ c$ n! o. J5 \- M& K1 T# t
- ;# J- L3 l7 x% m; u6 d8 |& W* @" T
- Entry:
! [& D3 C' A# Y! v: Y& f - ;& O# c! L& ?$ D/ C! `6 q! B) u
- ; Set up the Stack for Undefined mode3 @& Y0 t1 q9 m
- ;
. [0 p) v( o( x _2 x - LDR r0, _stackptr ; Read and align the stack pointer
0 _" X4 E6 i. D - SUB r0, r0, #8% [3 I! O$ P( Q
- BIC r0, r0, #7
2 M) o% U$ O9 ?- V: z2 l/ F: E- w7 | - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode Q$ K9 n4 J& c# C0 u0 l: a: {4 a
- MOV sp,r0 ; write the stack pointer
3 o6 ^$ J: ^5 l3 \ C - SUB r0, r0, #UND_STACK_SIZE ; give stack space- I; a# o. g4 u* v
- ;
. s6 `% ?) a1 e* v1 @ - ; Set up the Stack for abort mode
! q+ m) r+ L- M1 a - ;
$ r/ L. y# [1 _3 ^8 D - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
5 T6 q& u3 H3 f0 n7 f; p - MOV sp, r0 ; write the stack pointer# h) U6 m9 D$ [- t' f, i: n2 y
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space6 x5 f2 i7 m% `; _3 V/ U5 r' U
- ;
/ F% Y% Y: g7 d4 S @ - ; Set up the Stack for FIQ mode/ f0 a: P' L* Y% P3 |' Y- w
- ;
" N! L3 w" P: V- c& B* s, B - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
1 @: Q9 l& H# {: ^& b - MOV sp,r0 ; write the stack pointer. `; \* y1 n& E( a1 `
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space/ e( k* ?$ y$ L2 d/ V* o* y: q
- ; ? Z0 q: W( m0 l3 q% ^: W z$ y+ ]
- ; Set up the Stack for IRQ mode- h& d7 \# C) X4 @
- ;# |5 _) o! q& i% _
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
5 j1 _+ [+ V- M. |5 D2 ` - MOV sp,r0 ; write the stack pointer
7 J3 X6 J. M& @ - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space( b2 n5 |* F5 r& x
- ;
2 Q; g6 x3 k5 F' w9 H - ; Set up the Stack for SVC mode6 O+ a# t' y( D$ V
- ;
* o2 ?6 i1 l3 v6 m9 b" x. Z9 G) a - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
9 C* u- [/ f* V0 J8 Q% o5 k5 W - MOV sp,r0 ; write the stack pointer6 [' L: ^( r' U5 U
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space* \5 q3 W/ O" i( T8 G
- ;
6 r6 B0 {! u- o) k6 ^$ _ - ; Set up the Stack for USer/System mode" a9 D [- k& P
- ;4 [8 p/ Z4 u8 b6 h1 P/ ?& n1 |
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode9 A! ]2 _) b5 `, j& P
- MOV sp,r0 ; write the stack pointer
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- ; Clear the BSS section here
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- Clear_Bss_Section:+ g# r% d/ Y( w& i& w9 x3 F- V
- 7 K2 m) C- S$ }3 A+ o7 c2 e8 h. h
- LDR r0, _bss_start ; Start address of BSS
. {! o7 e6 B& F: c2 [2 }( \ - LDR r1, _bss_end ; End address of BSS
$ t' L4 s7 b% f4 B( Y- j0 A - SUB r1,r1,#45 ^; p' ?, H a# {/ D3 J* W3 z8 X
- MOV r2, #0% [7 K" ^' ?6 R N; E
- Loop:+ E! ^( u, s& h/ q) d
- STR r2, [r0], #4 ; Clear one word in BSS" B/ X3 C. I5 a3 I
- CMP r0, r1
( W4 O6 ?7 \/ b2 U3 f - BLE Loop ; Clear till BSS end
) O# r w* Z$ _6 X5 E) h
5 P5 a* `3 M# J. |' f- BL __TI_auto_init ; Call TI auto init0 b O( |- z, d. g5 `- ~' \; q% ~9 x
- ! a. V; }. `9 ~
- ;
, R6 t- M; U9 {, t9 Y/ b - ; Enter the start_boot function. The execution still happens in system mode$ M: B& V" `+ [3 h) b
- ;% @ \! a/ L4 i+ i
- LDR r10, _start_boot ; Get the address of start_boot
Q+ ]0 ]4 F" X- `" ~9 Q9 i - MOV lr,pc ; Dummy return
% \% h* E9 \8 q1 l% O - BX r10 ; Branch to start_boot' T4 z& x2 B# N: C
- SUB pc, pc, #0x08 ; looping/ A$ r. R% M6 F$ z& [
- 2 i ~, E8 ~' n# j
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode0 M0 U( T/ S1 `3 d% e! u
- ; BX lr
0 O% z2 [' X+ D: m4 G5 L - ;. T( }* \" b, l6 r
- ; End of the file- H# c' G& }! A+ t' Q
- ;' `/ L- M4 e) k; `) Q+ M: ?
- 9 d* h V- O1 H) y
- _stackptr:: Q: A$ p9 I# i, y( O. D* r
- .word __STACK_END
# h! E# U) d" `0 E; ^5 q8 W2 P - _bss_start:
7 b! E3 ]1 K; v X( K: B/ j! D - .word bss_start
1 P- H0 Y3 u4 t7 z* c' k9 A - _bss_end:3 r6 u$ o# g# Z3 `! i' z n
- .word bss_end( V8 o7 X5 s. e# s+ s0 t$ h
- _start_boot:; j5 X8 \1 l$ o6 D4 ~+ \
- .word start_boot y4 P" k' p2 _, ^
- _data_auto_init:: ]" J( B; w/ }' a; a* [7 h
- .word __TI_auto_init
E8 b& `/ A5 [. A: t1 ^, J( n - .end) f y& d- v% I- ~' v8 u
-
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