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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
6 P" P2 Z$ i' i" {) I# f1 ~/* 重新配置程序入口点 */+ q3 B9 F7 [( F& a
-e Entry- /****************************************************************************/
# i" T" u0 _* `6 G; V# W9 ^8 O' t - /* */
; t; g6 n+ a6 X0 \, e) }% m - /* OMAPL138 及 DSP C6748 内存空间分配定义 */# K6 i0 C" d, J. o4 G3 D' C
- /* */* {/ p2 I5 c0 E
- /* 2015年04月20日 */# t' a, |/ a2 I+ }9 q
- /* *// y$ f/ Y# ^) \& C
- /****************************************************************************/+ ]# e% R, ]4 Y4 r; ?1 M1 e
- /* 堆栈 */
8 f' a$ Y( [8 J - -stack 0x80009 U V9 W/ Y; M% v. f- A7 V
- -heap 0x2000
- A" u: ]3 K: ^8 L2 ^ - / i5 D0 f6 d6 B0 R3 n {# C$ F; j
- /* 重新配置程序入口点 */
\! Q, ?0 Q- r* l! S& H - -e Entry2 J( d$ d6 f' S+ ~' i* j& |; N
- - [2 l- X4 ^! k$ W" i8 y2 c
- MEMORY* c" ~" O; b% Z2 E
- { {( W4 C8 T8 F+ X* N
- #ifdef DSP_CORE8 R) l6 `6 N' G; n( Z" G
- /****************************************************************************/! C4 p0 ^. v+ W
- /* */
Y& E- I w/ [) x3 S d - /* DSP 专有内存区域 */
N- I! G, U7 \) q7 U# `+ _; H! h - /* */
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- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
) @8 f6 a4 \& }& j0 g( s - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
5 C! ]! d% \1 J7 B% \" q+ N W - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */+ o& @* J4 i" B. {- z7 v
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */! L0 L! a: Z' c4 r
- #endif
复制代码 这是一段汇编代码用于切换到特权模式
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2 \: [# y0 F: Q) s, V# pOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm+ G' G; R# K! Z' c# k9 \0 A, y
- ;******************************************************************************
) H7 v. D3 G1 } - ;4 \ Q; V) [; }/ ^' U
- ; init.asm - Init code routines! D8 \6 k! a% c3 y! Q" n7 K! y' |
- ;
8 c" {2 u/ i; E( p k0 q2 U - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ Q+ L& Z- r. G0 [ - ; All rights reserved.' d! x! ^, ^% Y/ \, [" r/ s% c
- ;8 I" B! U2 s- O( Z2 s, R: z
- ;******************************************************************************' C2 a& q/ h+ K% g$ {7 t
- ;****************************** Global Symbols*******************************
; V7 J$ v" i3 n9 }) ^0 F - .global Entry
7 B3 t6 }' w/ Q! }% L1 L9 u/ f - .global start_boot3 [% Q9 {+ t: e5 r; I" z$ d2 R* t
- .global __TI_auto_init
5 `$ T9 p5 B- m, h3 B& m - * y0 ^* h& n8 h4 f" W3 w4 w) w [
- .ref __stack+ b' D- \4 u1 Z! h: h
- .ref __STACK_END
; h2 A; y4 E) |" N. Y1 f - .ref bss_start
4 J; I5 n+ `7 F1 r - .ref bss_end* m. f3 ?) F5 z( `7 K' `; F
- .ref start_boot
& {1 ]% r ]3 B& ~! b+ K
% Q+ z: E6 i6 ?7 Z y- ;************************ Internal Definitions ******************************1 e. ?/ c" e1 t- f9 r! r/ W
- ;
& C8 `. G( J$ `& s! o. H+ ] - ; Define the stack sizes for different modes. The user/system mode will use3 l2 w. Z( R6 c n; d% \
- ; the rest of the total stack size
' k6 n6 F+ g+ {4 a+ b - ;
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- UND_STACK_SIZE .set 0x8
& \' g$ {9 t/ a* ?% c" I - ABT_STACK_SIZE .set 0x8
+ T: S3 a4 B* P - FIQ_STACK_SIZE .set 0x8
3 y: Z& O4 J4 Y( v) b9 P( q4 n - IRQ_STACK_SIZE .set 0x5003 [* g! l# g6 ^9 W. ]
- SVC_STACK_SIZE .set 0x8
# u/ v6 J2 L/ j! c- @
/ H$ K$ x! g& r' ?8 P! y j& \- ;
! [6 N! U$ e! s' ^' X% q6 d - ; to set the mode bits in CPSR for different modes
. M% A, C- E3 Y; ?& I, b - ;0 B( c; q q4 o, ~/ N' i
- : ^2 P5 l! v) {. b! x
- MODE_USR .set 0x10
* R$ {1 h2 T$ ^; ~: D - MODE_FIQ .set 0x11
& W' j& g' G \7 T. T - MODE_IRQ .set 0x12& h! x6 v; W% U: L4 F# ]$ J
- MODE_SVC .set 0x130 d! _/ F' w" | C, G# b/ ]
- MODE_ABT .set 0x17
- e1 g/ u* Z2 @ - MODE_UND .set 0x1B
9 U- @8 y: U: ]9 [: Q - MODE_SYS .set 0x1F+ f! `8 T# B+ W& C2 }/ s8 u+ k
- - J# }3 \ ^) P0 @7 Q# X7 N
- I_F_BIT .set 0xC0
. a6 b" P+ d3 `3 S' Y/ m - 9 q5 U: ?; q- O& W3 e! b
- ;**************************** Code Seection ***********************************: \1 U9 k/ ]( o+ s6 r2 c6 y
- .text
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- ;+ t" {! a5 Z& T4 D
- ; This code is assembled for ARM instructions7 P; D) P% `" X: J5 n
- ;
+ |( B7 ~; f* b, a2 w* h) w - .state32) c& p% Y$ S) _( d9 ]2 f* B" ^8 w) L
- : N: m5 Q2 Y. ^- ^, m) I
- ;******************************************************************************% D7 [& Q( m+ \
- ;' Y; |% o/ i( v
- ;******************************************************************************
2 i4 f8 d/ F1 n" } - ;
' m" I) g- Q3 ]2 b2 W) P: N - ; The reset handler sets up the stack pointers for all the modes. The FIQ and$ P) j6 M; T! D. e% V+ c! }
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
& z w" S1 {/ @8 |3 g: H: c) P# u - ; main() function.
) O* R1 D3 o3 p9 D9 \ - ;& O7 d6 Y% d0 A
- Entry:4 i9 `1 o+ f+ [0 f- l3 X, ~! A1 D
- ;+ |6 S/ B$ u8 E* W: V# {+ z; c
- ; Set up the Stack for Undefined mode) q( Q- ^ r8 I
- ;
! O8 }* m+ G1 E/ p! W4 ~ z$ V9 X - LDR r0, _stackptr ; Read and align the stack pointer
0 {& |2 t [- `. Q - SUB r0, r0, #8% K/ B' d3 X+ A2 _
- BIC r0, r0, #7
/ V, w$ u# {1 y J+ p% p& ~ - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
- u& p) ^+ t3 Y y- b; ]% Y - MOV sp,r0 ; write the stack pointer
T2 v/ d! ~: Q1 {6 i* S - SUB r0, r0, #UND_STACK_SIZE ; give stack space
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- ; Set up the Stack for abort mode
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- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
1 r6 k" ^* o1 H$ ~ K1 t - MOV sp, r0 ; write the stack pointer& T; `3 ^" d% D, J( S! e" A+ r2 t
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space! j) e7 e& V: e5 q4 C, m. B, E; {
- ;; _7 p% C; m# l# x. A0 j ]) L$ c
- ; Set up the Stack for FIQ mode, g5 T4 C& i8 Z/ L5 T
- ;
' n+ h8 p" i/ M9 }7 k D3 v - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode1 o( I+ y+ E4 s6 H6 C
- MOV sp,r0 ; write the stack pointer/ K% n# B; S# X3 [& J; ^8 M
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space+ \% j: W& f: P
- ;
; Q' D, K9 X; M, j. q3 d - ; Set up the Stack for IRQ mode
, n0 e6 o, |' Q m2 { - ;
- z" w6 K: R+ J3 N - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode+ |1 x8 J7 \: f3 w
- MOV sp,r0 ; write the stack pointer& U$ {# V* t2 c- ~3 l" y/ t
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
/ }* B" q0 o: k2 | - ;7 u; H* F; R9 q1 G |' S: V/ |
- ; Set up the Stack for SVC mode$ G" I8 D4 l& s% a5 U, c" w
- ;9 B) L& d0 N# L) i5 |- `. I7 Z, X
- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode: y" n1 n. y0 @6 A \
- MOV sp,r0 ; write the stack pointer7 [. W1 {" G4 U |
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space/ `' q+ C# S6 s' e ^1 w9 |
- ;
+ J1 F7 i" a) K; s - ; Set up the Stack for USer/System mode4 r1 Q- d Z D; q1 F8 m: B& C
- ;7 H$ K3 w- H( k) K/ e
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
6 W$ f: c# `0 U9 } B, H9 T - MOV sp,r0 ; write the stack pointer% O4 d- D' E" D$ p O( v
& Q* d" K' o6 h- ;
' W) D; F: r* D3 P2 h# ] - ; Clear the BSS section here
6 D1 m, |/ S u" Q7 m0 f5 I - ;) h; a0 K' j! U; y! ~. L2 G
- Clear_Bss_Section:
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- LDR r0, _bss_start ; Start address of BSS/ C( }* G5 h) U+ E
- LDR r1, _bss_end ; End address of BSS% k9 A6 Q c+ `
- SUB r1,r1,#4% g* ^0 p' j* K P
- MOV r2, #01 W+ w% `9 I( q, E; o% I
- Loop:
: L+ s6 Y E( z S. A" J/ G - STR r2, [r0], #4 ; Clear one word in BSS
8 R9 A6 J1 |% P- L+ M6 m6 B2 Z- e - CMP r0, r1
0 V3 e5 E; p2 k* P# W' o, r - BLE Loop ; Clear till BSS end1 o' h. `, q! C8 Y: n5 O6 z
- 4 C" w7 u! ~( d/ Z/ a, u( `( g
- BL __TI_auto_init ; Call TI auto init
0 `, K, U3 |7 _6 n8 Y4 { - + s" A+ B }) R5 p: |
- ; ^+ o( I6 I6 V) j
- ; Enter the start_boot function. The execution still happens in system mode
1 G" J2 o, m5 F/ @6 t1 S - ;
% h0 B3 D0 b" R9 Z2 A( R - LDR r10, _start_boot ; Get the address of start_boot4 v8 ~5 h! ^, ~* {$ P! {. |# k
- MOV lr,pc ; Dummy return $ r9 V5 o0 H3 h2 U
- BX r10 ; Branch to start_boot' X: r3 |, H1 q0 v
- SUB pc, pc, #0x08 ; looping
: u) m7 @2 `& [1 P, b. V/ \ - ; s! ]+ I1 B4 x. b; n: d# T
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
4 J$ h4 _( o: m6 M$ \. t/ d - ; BX lr
9 F; r2 @( a. l5 J0 ], m+ ` - ;3 A( }$ T- Z' d5 }. T
- ; End of the file
! v4 z1 J" k- D( G$ H+ h8 F - ;
- i6 ]' N: }* k' W' c4 }, v - ' m0 {7 K7 E8 v0 z
- _stackptr:
5 s7 d) |$ Q5 `1 y$ t! D. [: \4 [ - .word __STACK_END2 x2 }( M5 `. g$ l) t2 l3 c& |% N
- _bss_start:' t. j( V& Q, U a
- .word bss_start. J0 q; _5 C+ C7 K0 g
- _bss_end:
' K* T: ^* R7 f' X; c- v- y/ G - .word bss_end# x Z" A- k# a2 C; X! M
- _start_boot:
. i/ K+ p2 L) \' P4 }8 \ - .word start_boot6 |. i- P- z- \4 X+ n7 r) i$ ]# |
- _data_auto_init:
! j- A0 x. u0 a! k& h5 f% ? - .word __TI_auto_init) A. z; i2 c& M1 e
- .end" f" ?; M/ \9 s9 J. v9 T l
-
& ~* c8 S: x! t/ m5 e3 q
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复制代码
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