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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句0 b' v6 e( C6 q( j0 r3 d) K, p
/* 重新配置程序入口点 */) ^% `+ {. T L( d9 b4 l% c1 I
-e Entry- /****************************************************************************/
0 E8 U1 D" `+ U# f3 v; m. W - /* */6 c5 S ^9 ?+ P5 e6 J( T j
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */
* y2 e' ?7 Q w; e: h$ V; l - /* */( b y3 d/ {+ o
- /* 2015年04月20日 */# l# Z. z$ D2 v8 i# q& Y& a
- /* */
0 N- p& A1 `. S1 }9 ~ - /****************************************************************************/
+ V" t, e. b' B3 U5 w( L - /* 堆栈 */
! Z4 ]% h9 d; ^ - -stack 0x8000) i6 {& t" E$ e" _: g' X
- -heap 0x2000- @4 R4 S1 i' n
- - v( }' U; Q. p# v" d9 f
- /* 重新配置程序入口点 */
+ `, U$ F( ]9 y% @( |- W - -e Entry0 Z* `9 ^& {, N
8 y5 L" q! N3 ]6 @, x& _9 U/ u- MEMORY$ h5 G) _6 I# M; I; S: v7 Y
- { u& x4 N% z$ C+ A
- #ifdef DSP_CORE
& Z- P2 C. R9 Y7 ]0 _9 G. L! |3 B - /****************************************************************************/
& x/ c: X% ~; n, h. Q7 i - /* */
" E& m$ o6 i" X; y: R% d4 e" O! g - /* DSP 专有内存区域 */0 j* {" r8 k8 u) p7 ~. a
- /* */& m. A8 W5 U+ D
- /****************************************************************************/( x& B7 C' D' X0 S! c9 i- O
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */: G s$ F3 F# i. }
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */# t+ ~+ A2 p! m& V- L& O) Y
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
$ g/ W5 a6 R/ ^. D% a: G$ Z5 m% Y+ v - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
. X: Q" {* T$ E. U1 b - #endif
复制代码 这是一段汇编代码用于切换到特权模式: }& {, X* O* G) j* M) ~
2 D& m C" e1 C$ m" x9 r* UOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm( h% b: J% j/ s/ K& Z
- ;******************************************************************************
: y' T0 M: n# Z' F Q, R - ;
- |. C+ [; k6 Q" y5 T - ; init.asm - Init code routines
& v" p' w: `9 c4 g% z, a2 r) A! x0 d - ;6 z! m/ s0 |& [1 ]
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
. E# ~+ L! f c( F$ a) T- G - ; All rights reserved.6 w; @- t4 r! m- A
- ;
, G- S) v0 l; C* s' _1 ~6 z/ J - ;******************************************************************************
: j0 z- B8 H2 W% ^* I( [ - ;****************************** Global Symbols******************************** G$ v/ F5 Y6 R# Q8 U) E- p9 s
- .global Entry5 R& m) B u2 K/ n8 c5 D
- .global start_boot9 M& O" a2 ~5 p7 R8 b% B$ W4 h
- .global __TI_auto_init1 m! u5 u, a3 T$ ?
- 9 q) v0 h% T8 i& m
- .ref __stack& v M; Z- j2 s+ R# B
- .ref __STACK_END: ^/ |1 @/ E. E! e; o9 {$ ^
- .ref bss_start' g: v6 V6 }; h
- .ref bss_end
0 b- s; Q8 J& i, I% s - .ref start_boot
- B' n) w$ w8 x' G. d" x
3 l3 s5 I X1 L. p, p- E# ] m+ u- ;************************ Internal Definitions ******************************$ \* x+ h* B1 p# L$ D, R+ m5 G
- ;% q$ c; T1 I) v* r2 m% K L7 O) d
- ; Define the stack sizes for different modes. The user/system mode will use5 ?$ V+ i( |- ]% T% |$ S9 ~7 m
- ; the rest of the total stack size, r# Z% l, @1 O- C% C: w1 [0 N
- ;2 ~0 ^, q, }+ |: @0 W
- ( ]6 h- G2 U: Y- k, N
- UND_STACK_SIZE .set 0x8
5 a4 V. z& n( X$ o9 n: v4 _ - ABT_STACK_SIZE .set 0x8
+ [2 a4 f$ W3 Y; t& [ - FIQ_STACK_SIZE .set 0x8
3 N* h: K# w G+ G/ v; Y+ ~& y - IRQ_STACK_SIZE .set 0x5000 R$ U. `: Q( H* S7 L) ?6 x7 S
- SVC_STACK_SIZE .set 0x8% I6 [3 V, c+ n' M; _
- 3 B9 O) o: N, q3 g8 c; w
- ;4 J" s4 B8 R/ ~0 \
- ; to set the mode bits in CPSR for different modes" p9 f, o; _8 E$ ^# K& j& R, g) D
- ;0 {6 F1 g) E) I% z! b1 q" S
- - p' M# j: v7 V+ [
- MODE_USR .set 0x104 {) H. [! v6 e f" h
- MODE_FIQ .set 0x11
) F, Z. W" x8 x; a4 Q - MODE_IRQ .set 0x12$ a7 w8 \' O$ K+ ?. L
- MODE_SVC .set 0x13
" N7 x/ t8 W; w5 T; R) V - MODE_ABT .set 0x17
6 N$ d; J: F9 H; r' q5 s* k - MODE_UND .set 0x1B
6 D7 }1 v9 u( v* Z5 X2 a - MODE_SYS .set 0x1F
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- I_F_BIT .set 0xC0
4 l4 o( h: {2 L* m( D8 @& C4 u - 4 k8 A" ^) N. u
- ;**************************** Code Seection ***********************************
9 q5 h* W* g* x) y- i4 L% p - .text
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& {& R* W2 T: c4 A, D- ;
1 @5 L) a8 N" G% ~7 O0 V& k& H - ; This code is assembled for ARM instructions* P% v! Q- r5 m1 z
- ;: u7 n" f/ h+ e/ d$ x6 S% d$ H
- .state32 n Y0 M9 a- W5 @. J. V
4 t4 S. o. h6 D/ z8 s: D- ;******************************************************************************3 K3 n5 G) k9 b- T
- ; f M1 P% \& `) {& d/ C8 |) n
- ;******************************************************************************9 L, d4 _4 _2 W. {- T
- ;0 D( q5 Q q* a
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and
% Z4 w! R- |% T) E/ W; _ - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the* K2 w" b0 {" ~
- ; main() function. G/ }) H R6 q8 ~8 j
- ;
& L% d: Z# ]0 g9 \ - Entry:. \+ ~ r5 i( V( P0 r& A9 {9 g
- ;& W M+ v" O, {8 D9 g
- ; Set up the Stack for Undefined mode
. }$ N: b% w; V- D$ h - ; ?( a0 j! ?+ F$ _! y
- LDR r0, _stackptr ; Read and align the stack pointer' A2 h3 u* ]# `: \* ]' z( i, x
- SUB r0, r0, #8
8 W5 ^% o* {/ \, u - BIC r0, r0, #7" A6 ~' O, G% O% K5 j. x e
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
8 R9 ^- S8 l2 V& b" n; c - MOV sp,r0 ; write the stack pointer
8 ?! @8 d# a4 P, d, a* O2 \ - SUB r0, r0, #UND_STACK_SIZE ; give stack space
8 L& I/ M& ?. O( H8 J) B. ?+ \9 { - ;4 J5 H7 _, ^7 o8 C
- ; Set up the Stack for abort mode
- E: J% e+ c5 s" E A( q" g - ;# Z4 O; j1 \" [* o. B
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
( d, v* x* a( a: a - MOV sp, r0 ; write the stack pointer
0 A( t; y8 L' u9 U1 H6 w - SUB r0,r0, #ABT_STACK_SIZE ; give stack space$ E5 U$ z( a* u# k5 W( K0 Q
- ;8 @( h! r' t" i$ `
- ; Set up the Stack for FIQ mode1 p8 e9 `5 V- i/ a1 \) b% ~
- ;2 o |. R ~4 @5 V% W$ j
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode8 U) d% |! N% t1 Q: ~
- MOV sp,r0 ; write the stack pointer
1 @# L5 V+ s K9 e& Y - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space6 z! B( H8 q, Y7 o8 m9 L
- ;
$ ]5 O% M; G5 x8 W) o - ; Set up the Stack for IRQ mode
7 i- p) r( C' G/ q7 o) B" U - ;
8 q* G' f4 d4 j( X# K0 C9 d - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
" e' H% H7 I' ^( I& I. R! q H - MOV sp,r0 ; write the stack pointer
6 B; [3 ]9 u% _2 \ - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
+ ?$ D" u( w+ `' f w - ;
) F: d# H* J8 Z) @' } - ; Set up the Stack for SVC mode
1 B# [# |! L- P, }0 n4 y/ v - ;
4 j5 s! w, f* A; E! `+ a- y% G! L) K - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
, M% t* W: L3 S. k - MOV sp,r0 ; write the stack pointer
1 g% Y$ @8 T' \/ \ - SUB r0,r0, #SVC_STACK_SIZE ; give stack space
, Y8 R* F$ J8 ]' {( P: _) y - ;# i( b8 S' Z+ r" @2 N3 P
- ; Set up the Stack for USer/System mode4 ]9 K$ u6 v* E. |
- ;4 p5 P! a. T& m' R r
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode! [7 Z0 A/ }4 ?# U; p
- MOV sp,r0 ; write the stack pointer1 j0 y. |, q" P' b
- ) j" d0 t) z$ L+ n5 c5 ?( M, c
- ;6 R9 T% K/ j9 h# H5 r
- ; Clear the BSS section here
: U9 G2 Q6 i0 Y - ;
{- \& r+ T6 a3 J) h% i! ?, r) T - Clear_Bss_Section:
s* d2 ]5 S x' R - 9 X8 q" |0 z+ B+ d. z; R
- LDR r0, _bss_start ; Start address of BSS
1 r5 }( U8 ~0 G: v m' o+ _ - LDR r1, _bss_end ; End address of BSS
/ j/ I) {( e8 M/ B8 t, B - SUB r1,r1,#4
# X' {0 c2 x/ L* r- x1 y& d - MOV r2, #06 U4 u8 N8 i( k0 b+ e+ H! ~
- Loop:
, |0 C w A7 _" H - STR r2, [r0], #4 ; Clear one word in BSS; j- Y7 k8 Z) ~# }9 x" @8 L0 J
- CMP r0, r1+ B1 p$ k- c: O( y& y
- BLE Loop ; Clear till BSS end& D- P6 G+ R5 J1 q7 e
- : ]1 H# p' j. `& o- l. u% F
- BL __TI_auto_init ; Call TI auto init
4 _, ]% H. [- |, }6 v+ }
9 I8 T$ C7 F, F9 ^/ L( @' b- ;! U. ?7 \9 H/ Z: _+ `
- ; Enter the start_boot function. The execution still happens in system mode
g9 L& \: V0 J& F. P - ;
/ J0 G% K2 @( J! t" i! ~# N - LDR r10, _start_boot ; Get the address of start_boot7 G: b5 C. |8 S+ I( Q- K6 `4 T- S8 j" L
- MOV lr,pc ; Dummy return 1 ^$ A( w c# @9 o
- BX r10 ; Branch to start_boot
3 f: e: \% \; x8 c - SUB pc, pc, #0x08 ; looping
% A+ G! e, M. Z5 U* i+ y8 Z4 F% `7 W - 9 v1 r' J! |1 Y3 V# s/ C
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode, c- O v' _2 B
- ; BX lr( \, T( d$ a. c
- ;
5 F6 b* h" `: s9 {1 V - ; End of the file
1 |, Y n3 Y9 g9 g1 `4 R' `$ m - ;
, Y [8 l0 o% S5 a0 N - * Q! r9 @2 K5 r/ V
- _stackptr:
# I3 I( P7 f: D1 j& j - .word __STACK_END) f V" R# j( P* Y+ I
- _bss_start:
0 f/ g" g. ]1 S3 Y" [* F" }, w - .word bss_start
# P* H$ ]. C/ m* H R- A2 M - _bss_end:6 Z# ~" [9 q3 O! X; ]
- .word bss_end
1 f0 I# p8 r/ u& S+ j7 k8 L - _start_boot:3 {- W! G3 ]" R& i$ S/ t
- .word start_boot4 F( ]+ f! i! H+ N! X" U. P- {
- _data_auto_init:
: V% D6 o0 E& ~7 y0 e% R - .word __TI_auto_init
9 E# O! Q. I, I- {% `% V - .end
: {& [, Q6 U# q+ Q+ s$ Y3 L' c -
& B( O" t/ c: d" V( X- o
0 {1 `. C- M) K v- ( u& k1 w6 S) i
复制代码 ! f* J4 X5 h% C3 K% A
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