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# e% \2 |& H8 A& V在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
# M, n1 G& \4 ? q1 _+ f/* 重新配置程序入口点 */! K* Z# h l0 u. t
-e Entry- /****************************************************************************/% X( J% u4 L* y& m! G
- /* */
& |( F3 K& l1 N - /* OMAPL138 及 DSP C6748 内存空间分配定义 */
4 K2 M/ z% `0 ]8 [$ l) ]' b - /* */0 x0 F; g1 b9 p% R/ W
- /* 2015年04月20日 */
1 M5 ~: q( q% y# B) P4 N - /* */( c7 l; ~; i* g2 _( E
- /****************************************************************************/
) f. J3 Z3 d" f4 `* [/ I$ I2 l - /* 堆栈 */0 n. F4 ^. ~$ H# }
- -stack 0x8000
3 q( H5 ?+ o9 {- v% A5 V! l; W. U - -heap 0x2000$ e/ D& @! S8 W, g& N" [
+ W1 O& s' {8 N9 ~. t- /* 重新配置程序入口点 */
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. \, ^/ Z( r, }4 `- MEMORY
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4 P: E! |* P( c9 D# D' D9 y ~ - #ifdef DSP_CORE
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- /* */ P+ ?* k& o) e: A. q6 j+ {( }9 g
- /* DSP 专有内存区域 */( Y7 C- [+ k. D( [( s" _( _9 K
- /* */0 x# ?3 V+ Q8 @; s8 J9 Q
- /****************************************************************************/
: ~4 k3 u4 D3 s/ ?9 I - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
9 O# V$ E1 q- a7 H. l' \5 u, ?, ~ - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
3 M8 q9 f* Y& O. k - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
* `" e3 Q* M" a1 M0 i! c/ a( s - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */# B2 f2 o: z# T+ P X: d% h, ~" q
- #endif
复制代码 这是一段汇编代码用于切换到特权模式- s2 G6 [% Y0 m- \9 i: k& V
* X* k) B' l4 L- A z, ZOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm; Y8 j0 Q3 P/ O3 o& X$ _+ U+ w
- ;******************************************************************************
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- ; init.asm - Init code routines7 d @0 f2 L4 i# @8 s
- ;
3 M( e, z9 `* Z( `% W0 ] - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
- T/ R! ]- M7 a/ ~" A - ; All rights reserved.+ t0 o9 s6 H+ B! S
- ;; j8 Y: C9 a- q8 ]! v4 Y3 s* H
- ;******************************************************************************2 x7 k; K; w y2 X5 W
- ;****************************** Global Symbols*******************************" b7 P9 h; [+ p/ J% ^# H5 Z
- .global Entry& n, ?/ v2 O `
- .global start_boot9 L: F0 C- m+ x: R7 ]4 w9 |# s
- .global __TI_auto_init
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& [, G4 i; v0 I. i8 ~( e- v- .ref __stack
. k- V+ \ d- _+ V: o% ~ - .ref __STACK_END
: Q. @: W% z) B6 ~. | - .ref bss_start! ~4 P$ }) B6 d4 B y& S& d5 M$ `
- .ref bss_end1 X. X, X2 r; [" u# A
- .ref start_boot
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- ;************************ Internal Definitions ******************************
+ g3 L% \4 V0 e8 R p' E9 ] - ;: b* i$ x& ]1 e" x( Z$ e0 J+ h, V
- ; Define the stack sizes for different modes. The user/system mode will use) l! n# V. q. }0 a$ W) k
- ; the rest of the total stack size
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7 H& t( b3 w0 O% f! x. d- UND_STACK_SIZE .set 0x8
+ B* _1 n; x* _# t1 J. G - ABT_STACK_SIZE .set 0x86 y( T$ z) A6 \8 W/ a
- FIQ_STACK_SIZE .set 0x8
* e4 T& n/ a. u+ Y1 i! K - IRQ_STACK_SIZE .set 0x500' P0 P8 }5 ]( Z7 v) e
- SVC_STACK_SIZE .set 0x8( j3 ^6 J/ l1 m& U. F9 X( V
- ! \' w8 j; u! p( n. |9 i5 L& ` |
- ;! @$ s h! A I7 r' {1 _
- ; to set the mode bits in CPSR for different modes
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- - A: {3 B9 B. g4 ?6 ]
- MODE_USR .set 0x10+ y. e8 W, h& z+ @0 i! [
- MODE_FIQ .set 0x11 B' R' E+ ]2 V, t0 ?; ^
- MODE_IRQ .set 0x12
) ^: l8 X1 o- Z8 C - MODE_SVC .set 0x13) h5 h( q Q8 d$ x$ o* `
- MODE_ABT .set 0x17
: n+ T. L3 `0 m: t/ F - MODE_UND .set 0x1B M8 z) S" f1 j, p: d3 u! O' S
- MODE_SYS .set 0x1F. F$ e8 |0 L. w/ R% l9 g% e
- # ^1 P3 O# g3 w- E3 P
- I_F_BIT .set 0xC02 G: u0 u" c: |$ i: ]) Z
6 I; Q5 L/ d3 ]* g( z9 `( p- ;**************************** Code Seection ***********************************: B2 {& J ?4 R3 W) j3 x! ]0 G
- .text
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- ; This code is assembled for ARM instructions" N9 V9 u1 f5 b. p
- ;
; x7 u+ s1 S- M3 a. c% N - .state32* r4 E0 K# Y' E# \: w. E
& k) S) W3 y: |4 ]- ;******************************************************************************2 O m9 n$ w# ?2 I4 m
- ;# x5 l% D: ^4 [ p( i9 z
- ;******************************************************************************
3 V+ ~% |$ X( S7 q, Q8 I - ;
b( B( j5 g; }; F- M- M - ; The reset handler sets up the stack pointers for all the modes. The FIQ and
- X+ v3 q% C) j - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
% n3 I R. d# q' \+ s2 O - ; main() function.6 D7 Y, E* }5 _& i( p9 t! O) L4 v
- ;
7 `9 a( j* h0 G" v - Entry:1 O Q I6 ?- N
- ;, I/ U; s: O- q& P
- ; Set up the Stack for Undefined mode
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- LDR r0, _stackptr ; Read and align the stack pointer0 ?: a2 d2 H6 D' D, D) d) b
- SUB r0, r0, #8, n3 Y, n7 V5 I! ~' e, r
- BIC r0, r0, #76 W$ u% |. m; d& X3 p& i
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
( \6 ^" Z& U7 E0 y6 A - MOV sp,r0 ; write the stack pointer
+ C. _ _- d6 l - SUB r0, r0, #UND_STACK_SIZE ; give stack space- D% g# N3 ?2 @/ [( i0 [
- ;- r% h. D. i; D& i
- ; Set up the Stack for abort mode
1 o3 o3 J. @3 }9 L - ;
; V- v9 T3 s/ G9 }, L! p8 ] - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode3 r2 G+ J- i" y4 r4 E$ G) q5 v! ?4 q
- MOV sp, r0 ; write the stack pointer( H" b* l; |3 ]- w5 Z7 Q* ]
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space7 P% ]4 k4 \, O' b
- ;
8 S* v. C9 S. b9 `/ _ O8 w3 [ - ; Set up the Stack for FIQ mode
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- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
1 E$ `- h$ w6 w+ | - MOV sp,r0 ; write the stack pointer
1 e# `; |: T' h - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
5 s7 `9 M9 E5 N6 \; b - ;
& F: Q$ E" f" ]% E, ]& ] - ; Set up the Stack for IRQ mode
: O+ Y Y; l. g - ;
6 \9 n) g0 a6 l, H( x - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode. @- r0 g) u6 u% S: T
- MOV sp,r0 ; write the stack pointer
; s; O8 O7 _+ X5 c1 c9 P" r - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
& g% _' @7 a# E: q - ;
& Y+ n6 k+ ]6 g" X# ~ - ; Set up the Stack for SVC mode
- l1 F" F' L0 C @ - ;
& y/ t; F4 ]$ Y; H0 ^6 J: L. G$ ^ - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
) V9 C# Y3 I; E4 S5 o$ ]- Y - MOV sp,r0 ; write the stack pointer
5 M4 p N0 J1 h. n - SUB r0,r0, #SVC_STACK_SIZE ; give stack space5 ~' J3 o0 D' I6 B) C, w
- ;
7 B I; N1 f+ T% @# Y - ; Set up the Stack for USer/System mode
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- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode4 n4 q/ o) C8 l m! g O
- MOV sp,r0 ; write the stack pointer5 \7 r2 T% }7 W) }; t5 t
* c1 q$ q+ Z3 @9 Q5 J: G) S- ;
5 ^8 u# h: M- T- X - ; Clear the BSS section here
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- Clear_Bss_Section:
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/ H9 F5 }/ J0 P" I- LDR r0, _bss_start ; Start address of BSS
2 s6 T( i w/ B; m( S% @: R - LDR r1, _bss_end ; End address of BSS
2 J( B7 C. d) m, J& j9 l! E - SUB r1,r1,#4# p$ R. T- @5 q! @( Y( y% {
- MOV r2, #0
( H8 F+ q5 P7 R/ a* y# Y - Loop:2 c( g5 {+ p- J. t
- STR r2, [r0], #4 ; Clear one word in BSS( {" z( Z- i! c+ a( T1 e: d0 [" K
- CMP r0, r1
* G$ A0 B+ X5 y. i& I/ b6 X" O - BLE Loop ; Clear till BSS end
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6 T+ } W- H! S4 q' Y3 z, _ R. {- BL __TI_auto_init ; Call TI auto init9 p* ~+ }1 ?+ _5 z
- 5 X9 g2 x; t' H% f5 K6 o
- ;
& G+ \4 d6 I: r9 f3 d - ; Enter the start_boot function. The execution still happens in system mode
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- LDR r10, _start_boot ; Get the address of start_boot
8 M: F' J* f9 Q: G+ x - MOV lr,pc ; Dummy return " k3 B6 d% J! k0 k5 j3 S* V
- BX r10 ; Branch to start_boot, d! }+ h+ W3 e/ Y& ~4 @! _
- SUB pc, pc, #0x08 ; looping) d% q$ }# i6 @1 R' L
) |9 z, D4 _/ t& f$ [- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
1 Q, @8 I! n8 u0 `* V' x - ; BX lr
$ [) w4 }' U4 n - ;
$ B5 ?. H( C; h7 B& h2 v7 L/ @ h - ; End of the file. d9 O; A' _6 ] ^" j
- ;
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8 ?$ [$ I6 C- {6 @' O- _stackptr:
2 }$ g! I, n9 E, o5 E4 | - .word __STACK_END
; z) v( s1 S8 y* G* |9 X8 M: U& ? - _bss_start:4 E% s4 ], M* Y( ~- I3 Y6 B! ]
- .word bss_start3 T8 m( D& F2 E- D6 S, t
- _bss_end:. u- K2 W9 t1 l- z8 _2 q
- .word bss_end, `. E* q2 J( ^( M6 l
- _start_boot:6 A* l! o1 u' t' p* V; E0 }* y
- .word start_boot/ S$ j& d0 m) L |
- _data_auto_init:: {/ W$ V1 S! U: c5 E. f! _
- .word __TI_auto_init
& D* z) w& x4 o3 N2 J - .end
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复制代码
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