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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句+ l& S5 |1 F# C* C2 B: T% H0 o; G' E
/* 重新配置程序入口点 */# p6 e& { B1 R$ c C8 H) `
-e Entry- /****************************************************************************/6 J: s8 ^9 y x' v5 P
- /* */3 \ x. ~ ]0 v* N: e0 z2 B* k
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */, i: v/ r' h" ~: L7 T+ X
- /* */+ C5 a4 A7 g0 v
- /* 2015年04月20日 */4 @+ k0 D% u& [- w& P- Q
- /* */! t+ T4 q9 d9 g- Q; C
- /****************************************************************************/
" y8 `) Y7 l% M# ^/ h" X( m/ E `. j - /* 堆栈 */% C+ I' @6 ~% U
- -stack 0x8000! k* Z# p V B. H
- -heap 0x2000
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- /* 重新配置程序入口点 */ Z* R7 w% S( w- X
- -e Entry
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; X2 ]& f' l, A# S" J5 G- MEMORY$ C: s: C* x3 n5 ?# c$ a
- {
: k: _ u. O. o( a: _% r' z - #ifdef DSP_CORE
' A: i2 |. ]) r3 Z6 k. c* `% ^) r - /****************************************************************************/
# k( d/ E" G& C5 e, Y - /* */
: c$ t) h" s" l8 _) P: U - /* DSP 专有内存区域 */
2 q' K6 V# |! `$ ` - /* */
" l; y" M% Z2 }/ J4 {2 G. @( V( ^) u - /****************************************************************************/
5 g. f( |9 O( k! }8 o D; e) v0 M - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */- X, l, D6 |1 m0 s, b; U1 f
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */# j1 X* O* y% Q; S
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
% `: H9 R. G$ [' D& D& g7 y - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */( C" v3 F* S5 ~5 W& s3 G2 t
- #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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- b+ {- g5 Y' LOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm0 W) p* @" M3 T
- ;******************************************************************************
8 o6 Y' I- @/ B X) m4 U7 j - ;4 k# ?4 e4 T3 I0 L
- ; init.asm - Init code routines
5 d/ G6 H% @# \" Z0 K" j - ;( n: `. o) C% m- \
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
: l8 _* X6 ?( R/ ^ D, v* s - ; All rights reserved.
% R! S9 L$ @* U: N: h$ e& Z - ;
" p/ \% u" Q) u3 E' p% K/ i5 i - ;******************************************************************************
! Z, w8 x( n0 ?" z* F - ;****************************** Global Symbols*******************************1 h; d; x( D+ q+ b) b8 c) w( d
- .global Entry
6 ~# j& F8 |$ f1 g% ^! l3 I2 T - .global start_boot O7 w- \5 I8 M' X k* l
- .global __TI_auto_init! M) ~& n9 R2 B
- . w% c) z1 g( m( r& q8 [
- .ref __stack
' T X- r, u8 R2 L - .ref __STACK_END# O: C8 B3 H6 i. }9 d
- .ref bss_start
- z, f! t; B' |7 u - .ref bss_end
4 n0 b2 G; @$ I" y/ m - .ref start_boot0 t% J E8 n- Z2 r
, o, |, n: ]! D4 w8 D- ;************************ Internal Definitions ******************************
; `1 }: i; f& v3 A/ ]4 V - ;, I9 x/ G2 B- n; r! \0 ]1 g( y3 B
- ; Define the stack sizes for different modes. The user/system mode will use S! @6 H `$ Y4 b8 |: @
- ; the rest of the total stack size9 |% H/ o5 B+ U8 T, x+ b% g( z. l
- ;! A9 M! k9 g8 ?# x% E" V
- 3 s! b7 F0 v$ [! \' g% E; E
- UND_STACK_SIZE .set 0x84 n, l8 P1 ?# m9 Z& e
- ABT_STACK_SIZE .set 0x8 b8 `3 Y3 S$ P) p
- FIQ_STACK_SIZE .set 0x81 F+ ]* c6 j2 P9 ~. E* s& a
- IRQ_STACK_SIZE .set 0x500
: e. z7 L3 _* n - SVC_STACK_SIZE .set 0x8( i6 p# `7 d3 v& A# x C; Y* ^7 w
& y, V! o7 G0 x+ y2 V- ;8 x3 q5 m2 G8 W
- ; to set the mode bits in CPSR for different modes$ a5 @( v, P& i$ S# B% g6 b6 m3 k
- ;
$ @, X) b. `9 o' h* @+ I+ g
" z/ a& N5 `) r' v5 ~9 D6 U- h$ T- MODE_USR .set 0x10) y; d% A8 W' x
- MODE_FIQ .set 0x11
) a% F2 W, h$ ~" _ - MODE_IRQ .set 0x12
+ n; ^$ R7 L# S - MODE_SVC .set 0x13& h' z( `( h5 `+ O/ A: R, {, S
- MODE_ABT .set 0x17
$ M/ L9 V. U) h' O - MODE_UND .set 0x1B
0 A$ r4 v# V4 w I - MODE_SYS .set 0x1F
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, n0 F) T! b& p: e9 A- I_F_BIT .set 0xC0
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6 N) E( e. [7 P7 u! X) Z) O- ;**************************** Code Seection ***********************************$ Y% r2 T4 d) s8 g& v: N i c
- .text
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- ;
, i( S! q: t( A7 X6 R - ; This code is assembled for ARM instructions4 |* h; R2 @6 t5 _1 a
- ;
, o3 q9 w7 k8 Q4 d' g. x) G - .state324 G1 y' G, g/ S) B
2 P) l. d- g: A) u; [% i9 f$ A- ;******************************************************************************. J' k8 n3 w4 u$ Z. T' j0 f% D
- ;
0 U1 G; I- T- B+ |8 { h" [ - ;******************************************************************************3 T$ J' x$ D! z2 J! Q
- ;7 l0 Y+ \7 d( d4 P
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and' b, V2 v, U1 e9 \- p+ F8 t o$ R
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
/ ~, Q& H9 S L* j) `) t; A - ; main() function.4 f8 B( O" I- K9 ?
- ;$ n1 U) `% ?: D0 X: T! @( p5 d
- Entry:
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- ; Set up the Stack for Undefined mode' a* C! m% k) `2 w
- ; m" O' i( r* U9 P
- LDR r0, _stackptr ; Read and align the stack pointer( I' ^. K5 M3 J
- SUB r0, r0, #89 X1 ]0 A2 L" n8 L
- BIC r0, r0, #7
* M, q8 O, I5 V) ?5 a% w3 E - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
+ A7 H: g. t; x8 ^- p2 s; m2 z - MOV sp,r0 ; write the stack pointer3 t/ w/ _3 Z2 a0 F3 [) P
- SUB r0, r0, #UND_STACK_SIZE ; give stack space
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- ; Set up the Stack for abort mode! |5 f' _& `/ D7 c8 u$ V1 d% {
- ; }5 T0 g' O6 F A* y% J4 J
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode) \- F2 i8 ~$ m
- MOV sp, r0 ; write the stack pointer
! F! E8 E7 T. S5 A1 I - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
6 m& Z2 X7 n. v - ;, q5 z+ C6 `5 Y' p# [7 \8 J
- ; Set up the Stack for FIQ mode
. |/ x8 _& g$ p2 f - ;: f8 F' A" k: f$ L+ @; E
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
& i' @% e0 l. i - MOV sp,r0 ; write the stack pointer3 I, b) v3 W$ U9 O/ Q' M1 ?
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
6 ~: a% d7 M- e% i( M l. ?9 O - ;- o) Z1 A! V C/ h: N, m- Z" S. J
- ; Set up the Stack for IRQ mode+ j2 f- N/ Q( ]
- ;
7 S1 w5 n7 }) Z8 ^ - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
g' ]7 v. s& J# s: K - MOV sp,r0 ; write the stack pointer5 g- U( P8 L! V% D
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space) L5 g* B p' F
- ;
B, X8 j, c1 ?& k% @ - ; Set up the Stack for SVC mode
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- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode- \0 C4 Y+ g9 w9 G7 ^
- MOV sp,r0 ; write the stack pointer
n& g, }( V- i% r/ z. c - SUB r0,r0, #SVC_STACK_SIZE ; give stack space
5 b3 s3 f' D9 @# P( ?# B+ J/ `0 n3 a. Z - ;
# L& Y6 H2 h2 P- F' ?% ?% @ - ; Set up the Stack for USer/System mode- R% w( F7 g2 a9 c5 k0 w6 o1 Z
- ;4 x% h. W# ^2 K% U) z6 n2 c) z6 q
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
+ h: G$ H! i# r; {5 b. c9 o - MOV sp,r0 ; write the stack pointer) l$ V% S9 w6 M8 j
- 0 E" O3 @0 w) ?2 F2 n8 w4 V" V
- ;( ^+ `! O, K U
- ; Clear the BSS section here% m$ B& f8 o3 I' L+ k
- ;- c. B8 ~2 o& t3 I
- Clear_Bss_Section:
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- LDR r0, _bss_start ; Start address of BSS8 j% N# }/ k+ O/ F
- LDR r1, _bss_end ; End address of BSS- v" g2 m7 y. m& @/ i* j" I
- SUB r1,r1,#4
: a$ U# r* H B, e' |/ b' z - MOV r2, #0: T/ o: g: r P
- Loop:( P5 M; M) [3 x& j: d: k$ B
- STR r2, [r0], #4 ; Clear one word in BSS
% v7 r$ t) `* C2 h - CMP r0, r1
$ x% H9 @1 K' t' k6 u x2 y: o - BLE Loop ; Clear till BSS end
: _5 G6 Y/ ]& B D! y/ Q% P# W- E - 0 H( x, r5 j2 l$ @5 h
- BL __TI_auto_init ; Call TI auto init
: P6 c$ c" d6 R5 g
4 G6 R" I" D: Z& ]- ;( F3 c9 F. M7 r: e! O* y0 ?
- ; Enter the start_boot function. The execution still happens in system mode
5 e% ^) W# P* v* f( N+ I* a3 q - ;
B% o' s! {' l5 v7 [2 a' V - LDR r10, _start_boot ; Get the address of start_boot) ^ d% S$ E+ s' C9 B V# i3 j3 i
- MOV lr,pc ; Dummy return
: P, J' R2 h) b' g& _: M - BX r10 ; Branch to start_boot
3 o6 w" n3 M! r2 m. [ i - SUB pc, pc, #0x08 ; looping
( s' Z$ h0 [. R1 r+ ]! v* U' }
* X$ F9 y# R. C( }+ c3 V) q7 j k- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode1 X& |5 R& U. P6 g5 S# o
- ; BX lr9 ]# d+ B5 k4 a" E0 a6 x
- ;4 Y+ _" ^5 m3 M, R
- ; End of the file9 u9 ]8 \! i& O: O- a y
- ;. r+ [/ Z3 m3 F5 X) I
- 6 S0 T. t1 Y0 G) J' T5 c1 t
- _stackptr:
d& z; O% ?3 u) l - .word __STACK_END2 _, o, T, J. X
- _bss_start:
" [& h4 U9 H# U) n - .word bss_start1 `) D% h. p0 Z8 Q: z: b3 J2 {
- _bss_end:% N2 h! {& x5 N5 E
- .word bss_end o+ L6 {3 s0 ^8 w9 u/ Z4 h- a9 X
- _start_boot:
) }4 n7 C& T7 } c: l7 i' _ - .word start_boot" s7 z0 P3 X* _& P5 d: m, F
- _data_auto_init:
+ s8 _+ f4 L0 W$ S3 {/ P - .word __TI_auto_init
0 K; L# E* f6 U6 z: Z. f1 _% \ - .end0 n$ ^3 S! b7 u0 O: |' i( z
-
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- % d5 c9 t! B$ ?* J# A) B r
复制代码
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