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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句( i) Y& }8 _: D) }
/* 重新配置程序入口点 */
0 G' A7 s4 u' A. E3 [-e Entry- /****************************************************************************/6 P, s( e% {$ B+ F* q' S
- /* */9 y$ Y" \; ~( A: G3 ~4 b" ~/ d& b$ U2 E+ K
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */' c7 N/ U0 W8 ~; X: N5 V0 B1 B
- /* */
# _7 @) l; N5 e! |2 [, }' t6 O - /* 2015年04月20日 */1 P1 d6 |9 m; x( X. V$ R
- /* */
0 g9 W1 t: {! f- X, R# j# X& E - /****************************************************************************/
4 Q- c2 Y2 P ?3 M! [# k - /* 堆栈 */
. M) j9 J. U# M, h - -stack 0x8000
& D+ ?- {% @! Y7 n' C. {6 R - -heap 0x2000
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. `" O" c l+ Y. x- /* 重新配置程序入口点 */
' g2 I5 M+ c; c8 i! l - -e Entry9 e8 p( O2 s5 ^: y+ j
@ R% F( Y* T9 G, z- MEMORY' S2 X* \- d. v% P
- {
' C" {7 O& ]. w4 i1 N9 p: B2 v - #ifdef DSP_CORE
% K' o- I8 k7 _( F! |6 z0 ]5 ^- r - /****************************************************************************/
1 f. z- l1 G7 u" Y+ c' B* r - /* */" d' M- a- A4 P7 @
- /* DSP 专有内存区域 */' |2 t# w! }8 K% q$ R" \9 ?4 R
- /* */
/ _+ |0 p! G; i4 a! ] - /****************************************************************************/
+ W( j2 D' P, z - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */2 w" ?2 R8 D" ~) ^" I( {" y# x+ L
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
5 s. e1 z, e4 x3 N& ]4 X! J - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */4 G/ W) w" W" w
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
* u# f7 ~1 a& _0 O8 T. x; T9 ^. Y$ r - #endif
复制代码 这是一段汇编代码用于切换到特权模式2 T8 j; b' @ E( a' j. e
! w7 ~. A/ {2 m3 h% hOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
3 q. G: P0 A$ F k/ b- ;******************************************************************************2 S* p+ [9 q' w) A2 h# R! a4 ]2 J
- ;
! C2 L) k8 [) p7 _7 t - ; init.asm - Init code routines' @1 ]: A. l+ l
- ;* ~0 n7 e& Z& _$ `
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
: [% a6 ~% j5 r& R* p - ; All rights reserved." H2 }$ F* ?' I: `5 {# O$ p) N e
- ;
! l! Z% C) B9 c9 y0 d, l0 j - ;******************************************************************************" A& q: @( |; v: s; E- D& t
- ;****************************** Global Symbols*******************************7 H1 P. K" K0 V3 y6 K: t3 k
- .global Entry
+ v2 Z2 ?7 P6 b; a% S3 W - .global start_boot
% F) G. Y; }( B/ I1 i2 G( L6 z8 J - .global __TI_auto_init
' |! j6 E# r; [ ?/ T$ k) n - ' s: [) u' {" \$ Y
- .ref __stack+ O B: j$ Q( z1 G4 W. d/ ^/ H' s
- .ref __STACK_END8 u! G# x3 i2 ^3 D: x
- .ref bss_start' b0 {0 b# L- y& V. {
- .ref bss_end
) x6 ^9 q. I x" J8 n" d% s3 S - .ref start_boot
9 x& I9 W9 z# P* K: p
~1 e! \7 S& a- U: _- ;************************ Internal Definitions ******************************# D. h! t+ h& k/ c( D+ e& c" E
- ;
3 ~+ U5 b* C' D: N# a" } - ; Define the stack sizes for different modes. The user/system mode will use, i' n9 W7 @, I- k- j. g* d) H% l
- ; the rest of the total stack size$ v1 H+ B* |0 n Q
- ;& L7 D# m1 }- {
- \. G4 X4 J N% f: K- UND_STACK_SIZE .set 0x8
, d# n8 ?" `: t% ]6 B a8 f. l - ABT_STACK_SIZE .set 0x8
7 _5 g0 I S) t/ v( H) y3 D - FIQ_STACK_SIZE .set 0x8
/ ~! q; j- m& V7 w& W3 { - IRQ_STACK_SIZE .set 0x500( G: Z; c; O3 a: _
- SVC_STACK_SIZE .set 0x84 L+ Q# m' O# {% @# v# c7 P9 n, Q
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- ; to set the mode bits in CPSR for different modes( W/ R4 t# A7 A8 Q n3 i
- ;
# q; c3 W0 {- Z, M& e - 1 |: i0 |# D1 t: s
- MODE_USR .set 0x10; p; ^) f* R& P1 g
- MODE_FIQ .set 0x11, a$ E7 T* G9 j0 {+ `4 S+ A
- MODE_IRQ .set 0x12+ T5 U6 @: w! q6 w' @
- MODE_SVC .set 0x13
, J3 c5 w S3 a x$ r3 t6 R - MODE_ABT .set 0x17
P/ N# \) l2 I1 l - MODE_UND .set 0x1B
6 W, |" G9 }6 V) ?2 q0 f6 }' x( Y& c - MODE_SYS .set 0x1F1 a8 q9 t* |) ]' |5 n% S% e
! F' _7 X/ M9 `( g- I_F_BIT .set 0xC05 D6 I) T {0 Z1 x# F, O8 y2 D. f
- & c, c1 }2 k5 X! t K0 r
- ;**************************** Code Seection ***********************************
& @: Z" d/ }2 Y2 m - .text
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# i3 T/ F. \8 v- z+ B- ;
U; p0 e+ X3 C) e/ X - ; This code is assembled for ARM instructions1 W/ O! D/ U" b Z2 \, _$ K
- ;7 o% n5 D: G/ H: z; Y. M
- .state32+ I. s' M" E- B/ L% g
- . r% S4 l7 L% G$ D i; I! f1 |: ]
- ;******************************************************************************
- K* ]7 r$ f- V2 d7 ?1 ~ _) m - ;5 t: y( s' c e" |0 ?2 X
- ;******************************************************************************( ?3 g; V/ K, u' S: p' A' `
- ;
$ W/ S. Y7 C2 O6 Q- s8 J - ; The reset handler sets up the stack pointers for all the modes. The FIQ and0 y. r/ S+ l3 Z3 O
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
% n* E- C& y' {/ D - ; main() function.
. t0 ?1 M. M; S( h& ^ - ;
, J3 i d7 N2 i2 s. w2 e: f - Entry:! h! Z$ Y) b- X7 D
- ;: F1 h! T, X: i9 E; P" k. K. x
- ; Set up the Stack for Undefined mode) }2 H0 l4 t5 S8 p
- ;! ~. B5 k, [+ u, M1 X
- LDR r0, _stackptr ; Read and align the stack pointer
9 b5 s+ ?. i# L# X$ m - SUB r0, r0, #8
0 q' n! O2 G5 |6 K3 v+ x) E - BIC r0, r0, #7
/ }+ R( f5 D1 M. u - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
H' ~/ y4 t( @% }& H9 Q5 B3 ?# X2 Y - MOV sp,r0 ; write the stack pointer+ [ W( p1 E9 v- d
- SUB r0, r0, #UND_STACK_SIZE ; give stack space3 e7 j& b( A$ }! }: `& e0 z
- ;
{! _4 o+ \9 K+ ` v" d0 C/ f - ; Set up the Stack for abort mode
; k- Y# F5 w9 d - ;: q2 m- D8 K1 H
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode0 B; ]4 }6 Y* ^( t! P
- MOV sp, r0 ; write the stack pointer$ l' Z8 p% P" Z2 D4 e7 a: l
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space# S" S3 S. d5 U
- ;( S5 l! i8 y0 _
- ; Set up the Stack for FIQ mode! J' A3 G* d+ Q
- ;, X* y/ x" L+ v( ^& t
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode+ f' q3 H( n( w
- MOV sp,r0 ; write the stack pointer
7 n+ \4 E4 @: H! |+ v - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space. e. b8 l$ c' ]' h- q
- ;0 J: ~+ X1 t9 \! J6 f( V; y
- ; Set up the Stack for IRQ mode; a- ?" h9 t$ U
- ;6 z: ~2 I) L1 L. s
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode0 {' C* w' K2 @! r
- MOV sp,r0 ; write the stack pointer% Z9 m. M: U4 l/ D" D
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
9 M3 g# \- q! E$ t$ t - ;
+ }2 l5 ~' E" `8 R. c - ; Set up the Stack for SVC mode( Z0 `4 s" a/ H$ }: e5 S1 f+ u
- ;
0 C/ F ] ]0 h: X% ]8 w - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
; }/ [2 R# F [- y! i - MOV sp,r0 ; write the stack pointer
. w6 `1 M; h/ }7 X( t - SUB r0,r0, #SVC_STACK_SIZE ; give stack space( _3 A4 _& a& e1 k
- ;* i7 Q! M+ Z$ P
- ; Set up the Stack for USer/System mode
- ]3 N) ^: ^, o4 \1 Y- a - ;
# d- d3 O+ |) j( _6 U3 c - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
% b t3 D& x, u4 K" g) u; ^% V - MOV sp,r0 ; write the stack pointer0 H& H' [9 ]( _% P8 L2 `
1 @- x, D2 l5 a2 h7 u% I- ;
+ |4 U4 {7 m0 F; j( }/ h3 u - ; Clear the BSS section here/ K( b, U1 R q6 @
- ;
2 g5 f) r7 H6 e4 b - Clear_Bss_Section:' q5 Y" g5 Q. E4 c
- 0 {6 V8 ^# N% V8 a# o
- LDR r0, _bss_start ; Start address of BSS
/ C7 g$ J# v& O2 B! k1 n - LDR r1, _bss_end ; End address of BSS
7 x3 O* J' B( w5 g - SUB r1,r1,#4+ e: f0 O- e4 \, A8 i
- MOV r2, #0
( j* @# m0 W2 R - Loop:
. Z& T& D' M# P - STR r2, [r0], #4 ; Clear one word in BSS5 B/ G- @ D, @
- CMP r0, r10 ?7 A+ x4 Q2 ^9 M/ x0 h: m7 n- N
- BLE Loop ; Clear till BSS end
3 |4 E) _* Z1 n- e - 2 P: V$ z' q8 u% b! J- \
- BL __TI_auto_init ; Call TI auto init4 O2 w2 j% V3 J+ |! X* Y% G
- ) T4 U; _, S4 F4 P; ^
- ;
: ^9 x; n1 v8 _$ k* S - ; Enter the start_boot function. The execution still happens in system mode
3 t: N$ \" U* v$ ] - ;8 @& u5 x) d2 f: Q
- LDR r10, _start_boot ; Get the address of start_boot
, I R$ |7 y3 ~& R9 Z, S; R - MOV lr,pc ; Dummy return
! {2 B9 E# l1 M0 _, A' I, n! K; q - BX r10 ; Branch to start_boot
( M" e# |% _9 p1 z8 t - SUB pc, pc, #0x08 ; looping
, q$ O/ l. {5 [6 O
$ v' J( t7 s* H: S- |- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode" a `6 r7 {; N7 x* x
- ; BX lr3 |4 M1 j, ^$ P' ~7 C
- ;
$ [* U: t: r, }0 t8 G% d - ; End of the file1 |/ h+ s1 ] `$ G l
- ;; R2 t7 ]! N1 c& I% O) f
]( w& b2 f- c4 O+ d4 n: X- _stackptr:
& Y+ H/ G# L2 A1 T# E - .word __STACK_END D2 l* t$ S/ I; ~
- _bss_start:
3 @* N: [* { g9 K: v - .word bss_start
. b9 T! p% P- p% c8 f6 X - _bss_end:
2 p7 M# b8 P1 ?# _ - .word bss_end
( q* V, }8 }: ]$ y& O' j - _start_boot:
3 [: Z0 Z; s; |% A+ A- b - .word start_boot4 w& ?) W! u6 Y) k1 [
- _data_auto_init:
6 ~1 |! L, m A! H n& f: }5 { - .word __TI_auto_init
8 I1 J0 Y" j) c3 Z. a: G0 _ B - .end
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复制代码
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