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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句- l9 ~0 v$ X# E% W
/* 重新配置程序入口点 */
+ M" p9 J" R6 V3 B* U. H! ~-e Entry- /****************************************************************************/
9 f# p2 h& H5 M) a - /* */
1 X. Z) C* @/ w( R9 R3 A% V - /* OMAPL138 及 DSP C6748 内存空间分配定义 */
0 |5 K" T k5 t1 } - /* */3 E. c5 T6 l, \# W Z9 D/ k
- /* 2015年04月20日 *// K! c( A" n7 c
- /* */
. q2 |! G( N, P+ v) T - /****************************************************************************/
" b p. h; N" N& Y) V - /* 堆栈 */* q2 ]2 M* ^/ O) g7 S. c, q, \/ w
- -stack 0x8000; y' A' P: |' f: w& R( A" ?% g8 c
- -heap 0x2000
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- /* 重新配置程序入口点 */5 [& v) I+ y0 l& X8 W* i
- -e Entry
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6 q/ d1 S9 l7 Z6 ~- MEMORY& Z6 Y) [. }; |5 d3 H- \6 Z
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- #ifdef DSP_CORE
$ Y* B% E$ M) v7 d% p" t9 n - /****************************************************************************/& ^" \3 p E7 M- `$ D
- /* */: }8 u/ v+ C y4 ~
- /* DSP 专有内存区域 */# ^+ H5 H6 ~0 h, q! C
- /* */
7 ^2 S* B& d7 w) m- D. A - /****************************************************************************/% e x' t, D6 u( S9 l. l
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */: Y. C9 M' \: ^9 U0 v: e7 `
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
7 ~* \4 |$ q) U - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */: F+ j6 @) Y$ h7 n% h" C
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
+ W3 E$ l2 Q$ |* e- @$ |7 J7 ? - #endif
复制代码 这是一段汇编代码用于切换到特权模式+ C0 b3 y" T; N5 p& a5 W, h: T' C
+ } V }( ]$ p, tOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm, I- c' ^, q1 b8 q
- ;******************************************************************************
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- ; init.asm - Init code routines
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- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
" D. J& D y: O: f+ v/ y7 e - ; All rights reserved.0 g( l! _5 _ N
- ;0 c% @$ x2 u# `* Z! r
- ;******************************************************************************
@% ~! {1 j% G( _6 O - ;****************************** Global Symbols******************************* s7 l+ R: y+ c) N! n
- .global Entry
: ^8 c; D9 [8 B& }! ~3 I3 y - .global start_boot* Q- g( z- A. f+ d3 m* n
- .global __TI_auto_init
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- .ref __stack
, A. ^% j8 E+ | - .ref __STACK_END+ I, F7 c+ E. e3 c( ^# ~) e" M
- .ref bss_start- L. }6 n3 t8 M r0 }+ H- {
- .ref bss_end8 }0 X4 u/ _+ F- X! A- M5 {
- .ref start_boot
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2 T0 Z. F; l: l$ P. G# G& d# `- ;************************ Internal Definitions ******************************& l* p, S) l$ f( m
- ;
3 |; G z. j9 h1 n9 l Y- B - ; Define the stack sizes for different modes. The user/system mode will use; x/ U; d D% X3 f1 R2 \) Z/ @9 c
- ; the rest of the total stack size. b0 O7 p t/ ]4 \% _
- ;
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6 p! C. R0 {, P' Y7 \/ J- UND_STACK_SIZE .set 0x8
9 k0 s; b3 R. B! v; Q$ y - ABT_STACK_SIZE .set 0x8
* |' c3 z1 V" C* m% p0 m* D - FIQ_STACK_SIZE .set 0x8
1 H& z* n) l' Y1 V/ @* n* g$ {2 d - IRQ_STACK_SIZE .set 0x500
1 ^; u/ A2 |8 E) D7 [5 f0 @; `4 f( j - SVC_STACK_SIZE .set 0x8; B2 w+ @, @. X2 H1 E {) g
- + f2 @( U, r2 P3 z! q7 D$ c0 [
- ;
4 S1 T' D m' p - ; to set the mode bits in CPSR for different modes
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- / X. M/ P$ b- {
- MODE_USR .set 0x10
7 n3 T% G- `" _" n - MODE_FIQ .set 0x11' _+ y, n& S; K" ^
- MODE_IRQ .set 0x129 w9 H2 P* y" {, H/ _. i$ T% T
- MODE_SVC .set 0x138 [$ @; E# S# E3 }; E
- MODE_ABT .set 0x17+ w7 f! ~9 B' X1 [' d' x; ?3 A
- MODE_UND .set 0x1B1 U2 [7 O( k5 U
- MODE_SYS .set 0x1F
# `: B/ R4 N% _; h! s3 }# f
; i$ r3 e4 j3 }$ b- I_F_BIT .set 0xC0
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3 g6 b* B, Y( T, m# x$ l% G- ;**************************** Code Seection ***********************************
K$ i& {9 ~8 ^" H+ ` - .text
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- ;
- j, Q4 D% L8 L0 X - ; This code is assembled for ARM instructions
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- .state32
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6 o6 T3 J$ o! b6 c- o& D( R* q- ;******************************************************************************
0 `( Q8 [) P+ {0 X( x' a - ;
, W8 u: E9 A4 C: G' I - ;******************************************************************************
5 B" @) m# z* h0 [ - ;
( z( c; d4 U! _( o - ; The reset handler sets up the stack pointers for all the modes. The FIQ and% b8 K# A0 A( f: _
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
. P( m3 E c: l' D1 {5 w - ; main() function.% |- y8 o! ^1 @1 Y W5 m
- ;
+ N3 ^' g5 s+ l: T4 c - Entry:" _4 B+ Z; h5 P/ n
- ;8 @4 W$ w* R* G! X7 l9 ]! t6 @! _
- ; Set up the Stack for Undefined mode
2 X6 Q' \! T& K8 {! S% j( K" x - ;
+ r1 `5 g4 Z! u8 n7 |( m B - LDR r0, _stackptr ; Read and align the stack pointer
3 D) L. r0 R7 u8 }, Z - SUB r0, r0, #8
S& K) M) ~6 C7 k7 [ - BIC r0, r0, #72 _8 o2 P. v+ Y9 [2 S7 d" b8 s+ ?
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode8 X, p) B8 _3 {* M1 p3 @3 x
- MOV sp,r0 ; write the stack pointer; B7 Y \( c* r# a2 H7 X# N7 D
- SUB r0, r0, #UND_STACK_SIZE ; give stack space m! @. z i* J2 t; n* y
- ;
( S! `, ]2 Q1 S% X - ; Set up the Stack for abort mode
9 b7 Q2 _' W9 _2 E8 R - ;
: j ~2 N, V- Q. y5 C7 f0 G# Y$ Z7 b - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
; X0 y' N2 \/ l0 S) |& g) J) ~ - MOV sp, r0 ; write the stack pointer! s! I1 M( l' G
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space+ N$ o; f+ L2 H& ]9 d6 D6 k
- ;' b, Q; |" r5 o' I/ \. V: W4 P* z
- ; Set up the Stack for FIQ mode
. D- Y. w' Q& d) V" d - ;
6 r* U; W8 U7 Z ^* |! Q" m - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode# f5 i+ l. S" C4 c2 R0 I- \: A
- MOV sp,r0 ; write the stack pointer: y% ?0 [# S& j. k" v: I* m
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space1 r7 q( V& P" J# d' }6 k
- ;
! e% u0 B9 @( F1 S - ; Set up the Stack for IRQ mode! v0 v# l+ M( ?3 Q; v& U3 \" T4 G
- ;
6 w& ^' a! X0 ^8 c! ^/ x - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
* j5 R) Y6 v4 A$ K9 T - MOV sp,r0 ; write the stack pointer
* a6 n9 O" C |4 F) n/ u' m% g3 q - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space0 {0 H4 X3 `/ Y T0 l; _
- ;$ }/ |4 @. R* |5 h$ d; n5 L
- ; Set up the Stack for SVC mode
9 g8 C' b$ p& H* q/ a - ;
2 o) Z5 g6 d S5 w1 N - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode7 y B# z7 T: `) V9 s! f8 y `
- MOV sp,r0 ; write the stack pointer! w8 ~* r% g( L# N6 p, U( w4 F6 ~* D
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space' `" ?+ {7 I# P- ]
- ;5 K7 L. c# z5 g" x: I, @
- ; Set up the Stack for USer/System mode
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- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
$ J4 `- c4 m! |# B, j) g - MOV sp,r0 ; write the stack pointer
& _, @+ }. d! E+ ]3 ^: y/ v
$ G9 {- M; X! O1 Q, n* O6 u/ t' H4 ]1 _- ;
3 s9 i E+ J. O4 b* ^5 i- E5 B1 q5 s: P - ; Clear the BSS section here# O$ `; N" y- X
- ;
1 e# m/ k5 o- a/ X - Clear_Bss_Section:( M) b$ u1 F/ W5 n! s$ @# |
- 0 Q7 z: C% | ]+ v/ L5 l! Y( s. M
- LDR r0, _bss_start ; Start address of BSS
( F# [) |& z. | - LDR r1, _bss_end ; End address of BSS# ]4 ]9 L# Q9 _) J# Y
- SUB r1,r1,#4
/ E; D% v/ ?$ g) v. b M& Q/ s: l% s - MOV r2, #0
2 [+ Q9 n) ]; U# H* o - Loop:: z! n) p1 Q' U+ H% |9 S4 S4 T6 b& F
- STR r2, [r0], #4 ; Clear one word in BSS8 }/ E) v; Z% F/ R
- CMP r0, r1" I" S: w5 O Y8 L) c' P
- BLE Loop ; Clear till BSS end% x3 Z+ Z' {% O' D
' B$ v. T9 l! y% e3 C- BL __TI_auto_init ; Call TI auto init$ ^ p5 T8 M! K( \9 P; P
6 s) H1 K! t% [ X, ?! X- ;
$ f0 w# q6 P$ c3 @% k4 n# x/ Q - ; 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
* O3 s; F8 P5 E$ n/ e/ d - MOV lr,pc ; Dummy return
8 k( m6 M& f7 m& |4 e - BX r10 ; Branch to start_boot
J% \/ S! a! c- l6 C - SUB pc, pc, #0x08 ; looping" I- Z; y! {5 I! o
- . Z; m+ }% ^) i: W. R6 x
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
! O8 K3 Z1 I8 t7 F, Z6 I' |0 ] - ; BX lr
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- ; End of the file8 L% W: ]6 R* Z4 ?
- ;
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( L; I% F5 }. E3 e9 ^( P6 y: _- _stackptr:
7 S* d+ D v# p5 m4 p - .word __STACK_END
/ k3 c) O7 l/ }/ @* R3 q2 } - _bss_start:- @ p! ^( i1 L7 i& C5 W# B8 @3 \
- .word bss_start
5 L& V j; z& d) ~. d8 a$ r - _bss_end:- L! y" A- a" Z$ M9 p5 l5 _8 U9 n
- .word bss_end5 b" h _' j9 X- X# t
- _start_boot:. ]; q; c7 f" g
- .word start_boot% ]! m) s. Q! g6 z+ K9 [
- _data_auto_init:
) P9 T% w6 N5 G+ } - .word __TI_auto_init' W7 e& V+ g# w% e. V/ d1 f
- .end
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