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8 ~) r) ^+ k/ p& K- s0 I! O% j在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句, g9 P4 }% ]) ~& G% w: ~& _3 J# Q
/* 重新配置程序入口点 */9 p! v: c% [- v L+ {# u9 [
-e Entry- /****************************************************************************/
* A( {7 H3 h$ |$ p7 r4 }% P; t( C - /* */) s; k; w& Z% C" [
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */
; X6 X: I9 r& h9 |0 j. w, y - /* */
+ l* _2 v3 W; N# F+ X5 N- {: ^ - /* 2015年04月20日 */
) q) I2 j O* J% |$ H- N* _ - /* */* q$ i+ L8 p/ Y2 Y; [
- /****************************************************************************/
" t! `# W5 `+ `" X - /* 堆栈 */
. D$ _: Z% `7 t4 | P - -stack 0x8000
! C4 ^" v1 A* ~# {, I% d5 Z0 r2 | - -heap 0x2000& P- o" M* x; {# ]" @
- 9 V- j6 Q9 P& f& i8 ?" b
- /* 重新配置程序入口点 */9 N3 X! Y+ M' @4 Q9 z# \
- -e Entry9 q- _5 V' E" x! l! B% x: y
" f# G" S& v; O1 i! [* [- MEMORY, S; _3 C2 N N% N9 [& m
- {8 g7 V; a( F$ q3 x& E7 Y
- #ifdef DSP_CORE, w( K. L r) }8 j
- /****************************************************************************/4 Q, t" ]+ N+ @1 N' _. z" X& I
- /* */
O. t& X, q7 E: F' I0 @ - /* DSP 专有内存区域 */6 x! J/ C Q4 ?0 ^& I
- /* */: @) B" o0 l2 P2 N8 |! `
- /****************************************************************************/9 ?, L: T3 M8 g
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */# g6 }0 N# Z) N
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
# _7 x2 l; n0 @5 J3 y$ D# s - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */+ l5 p5 C$ h4 J! o
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
# C# A, s* A1 \* Z; n+ b( \ - #endif
复制代码 这是一段汇编代码用于切换到特权模式- V1 x8 m5 E6 |# U7 o. V k A& o
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OMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
$ l; v* k& L7 ^7 k, g- ;******************************************************************************
1 V& y% m: ? L7 ~4 S! t; v6 p - ;/ S; h& m7 I5 b. n3 j
- ; init.asm - Init code routines2 {$ _- c: b0 Y8 ?8 F
- ;3 o5 V1 b8 a7 \: Q3 @0 v
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/; ^( ]! {, ~: k% Q2 N: f7 s
- ; All rights reserved.. d9 f2 p, |* U( v, G0 d
- ;
; j- [- d4 D& D4 }* `2 e - ;******************************************************************************
: j- Q0 m& U3 \/ }9 O' L - ;****************************** Global Symbols*******************************) D& z( C! Z/ z, u' F' g _! e
- .global Entry3 Q6 {, M. f1 w0 E, e! n
- .global start_boot
9 o3 h2 u' a/ ^ l. D1 | - .global __TI_auto_init4 e9 t& D$ w! R0 i5 ~' ^9 L
+ c2 M6 x/ E5 y4 v1 r' V) `: s- .ref __stack
h" ?* M' r/ a - .ref __STACK_END
: v. B! C [7 o$ Y4 }, x7 O, }# w - .ref bss_start, a2 ]3 R- _% y5 c+ F" I* B3 N
- .ref bss_end0 k# Z8 Z2 `3 [' U3 {/ u% S+ E
- .ref start_boot
6 ~: C0 A8 J9 P U" ]" D+ p- R* U
# _6 B7 ]9 I' E; q$ z- ;************************ Internal Definitions ******************************
0 k( t6 m5 P' H" _1 T3 `! x% R - ;
# [- L5 i# e4 M: Q, Z# @; h - ; Define the stack sizes for different modes. The user/system mode will use1 e5 ^& U1 H( D9 q: q5 Y' A
- ; the rest of the total stack size4 r( ^+ n O. a8 w; h
- ;% I% t* {3 O2 V! b% Q L
/ H# }; b1 I- _0 M6 r4 x; m7 x- UND_STACK_SIZE .set 0x8
* V* ^# }$ _/ A& u - ABT_STACK_SIZE .set 0x8* h: b9 @1 n/ S; @
- FIQ_STACK_SIZE .set 0x8
3 I0 f7 ^1 @1 R/ v j - IRQ_STACK_SIZE .set 0x500
, C+ q! L/ E& i$ d - SVC_STACK_SIZE .set 0x8
/ p; f# {* y2 Q - 3 b7 M: Y9 A. x7 Y4 z9 p1 S4 E
- ;- q# D; W, A. R8 J4 P
- ; to set the mode bits in CPSR for different modes
* P7 g6 k5 {9 ?9 P, L. O5 \0 y, k S - ;
. j4 b& ~% i+ x# r3 _ - 0 k- g* |3 b* N3 g4 F! R
- MODE_USR .set 0x10
' @6 M* F+ V6 r" z5 @) _/ k C+ z - MODE_FIQ .set 0x11
; l/ k" Q' |) s - MODE_IRQ .set 0x12
- _! q/ q: H, x- K8 W3 L2 M - MODE_SVC .set 0x131 e- Z J+ I3 Y- I7 V& `
- MODE_ABT .set 0x17
" B& z+ C. X/ ^ - MODE_UND .set 0x1B7 u4 E: d* o9 A. f8 O
- MODE_SYS .set 0x1F
/ C' r8 i# ]5 m B* \# t5 b
: d9 b8 N* k% i3 ~; l# A1 x- I_F_BIT .set 0xC0- o7 r8 Q% w, p2 }: s' H
- : a5 o+ w; m0 t5 Q
- ;**************************** Code Seection ***********************************4 r% U/ D; a' J! d( v4 l) K
- .text. o* W* {, L4 F9 X
5 x' g7 S- ~! `6 `0 w- ;: m7 `! o& l" D* b1 ?0 m _
- ; This code is assembled for ARM instructions: h. \& D) z: n- K, @# E7 s
- ;! @0 R, Y# K6 M# A
- .state32
" s5 }! ^, V, _" m8 B - - h0 D) t+ \, |6 j- h
- ;******************************************************************************# U" M$ O1 |) J7 j/ X) g
- ;" t+ W; A0 |- y/ K" M( {" o
- ;******************************************************************************
0 w2 g$ e0 Y: g7 _; D s0 }1 `- O - ;
5 v2 E4 r# l" Q9 w( h# i - ; The reset handler sets up the stack pointers for all the modes. The FIQ and
* k4 |' o* X3 N - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the' p% p. g6 |/ Y3 p$ y1 J+ B
- ; main() function.8 {. s! m% `3 V4 k# U. x
- ;
3 x; m8 {0 L8 ^, l$ `* ]9 l+ @ - Entry:
' b& }+ g2 d9 G: v5 {7 w. G - ;3 d: {: c; v, `- W+ v
- ; Set up the Stack for Undefined mode+ P) K2 z3 a! w2 W6 X, {* c
- ;
8 o, e+ m- r/ C) N6 F$ Q - LDR r0, _stackptr ; Read and align the stack pointer. q0 M2 S9 D, U" ?7 D
- SUB r0, r0, #8# j+ `# s- _" b- [$ n( k: I. ~
- BIC r0, r0, #7+ \" i' K, G3 L# @
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode" W/ F* D6 z' K0 m: S: B
- MOV sp,r0 ; write the stack pointer+ l) w6 ]& J* N' T
- SUB r0, r0, #UND_STACK_SIZE ; give stack space
! T) E8 p J. X- I# _. Y - ;+ P0 `4 e7 A( a0 \4 P
- ; Set up the Stack for abort mode3 I1 d6 u5 k( a5 V, B) C' L' _
- ;
) Q/ r7 s. Y3 k9 ~& T3 i - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode+ ? F; W5 [- w( F2 _) D. u
- MOV sp, r0 ; write the stack pointer
- p* h7 w4 [% d1 ~ - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
2 |$ t! j8 C8 G" r4 @8 O - ;- s9 B- ?; p# b" N
- ; Set up the Stack for FIQ mode
' f# t( |# t u* O; R - ;
9 l7 Q) o9 T, @ - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode, M4 F% e+ e0 s- @" b# K- E" M
- MOV sp,r0 ; write the stack pointer
+ n t; @1 m. H - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space# [1 _/ L/ x( H0 y R4 [( D) c8 ^
- ;
/ N, m4 f" W y - ; Set up the Stack for IRQ mode0 ]1 O" L) G9 c
- ;& O' D, Y/ y% P- k" m( V
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
. U6 ?) u3 _/ D8 f- s - MOV sp,r0 ; write the stack pointer
: P6 I" {/ U; N# L - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
/ p2 s5 y( F3 J8 { v - ;
: M$ D! u- m4 G) r - ; Set up the Stack for SVC mode
/ Z3 |* I) a3 k7 o) r- a. L - ;
' o% _& _5 F& O! Q3 } - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode! s2 p8 t- ?6 ]
- MOV sp,r0 ; write the stack pointer
) e' C7 F' q! j& G - SUB r0,r0, #SVC_STACK_SIZE ; give stack space
" c- f1 }, P3 w; S/ ~# J! J2 R - ;
! t8 m, y1 K5 W8 g" [( { - ; Set up the Stack for USer/System mode
: m9 Q" n: n0 |% C - ;' L$ w( ]; a5 T
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
& ^+ A* O3 b9 J- O* x4 t - MOV sp,r0 ; write the stack pointer1 I6 {3 k( y6 F. h
- e2 Q, F' S) K
- ;7 Q s# e5 n4 u+ `. ]; j8 Z
- ; Clear the BSS section here
7 |# [- G) M8 W - ;3 V' e4 N5 ]) [7 l! I. z6 {9 O3 G
- Clear_Bss_Section:
% l+ n- \8 L* I; W! ?
2 p5 c2 I d8 F: z* }% s) Q1 T2 E- LDR r0, _bss_start ; Start address of BSS: m# O0 o& `: G2 W5 J% ?3 U& c5 g
- LDR r1, _bss_end ; End address of BSS- Y. T% s) H( w0 o) w9 \" B
- SUB r1,r1,#4# W5 S! |$ S# }1 Q& B2 g9 w
- MOV r2, #00 h9 C$ D1 p1 q8 ]8 E5 n6 }
- Loop:
6 |+ H3 V g' M1 O" q+ P. | - STR r2, [r0], #4 ; Clear one word in BSS7 Z( _ ]- e& G6 D, Q. Y: X) M
- CMP r0, r1: ?' q2 U! t& G" ?7 k
- BLE Loop ; Clear till BSS end$ W1 j2 B* @' U3 E7 o8 Q. X
- / `- J# B. L( F7 w3 q
- BL __TI_auto_init ; Call TI auto init
9 a" Y, u! [0 y4 Z
3 |# @8 d: f6 w* U+ u. e. U7 i- ;7 s' j4 z- Q- `/ E
- ; Enter the start_boot function. The execution still happens in system mode( s9 K+ z; P& [; {. |, f
- ;; |5 h+ ?& t. T( U8 q3 m/ \7 O6 I
- LDR r10, _start_boot ; Get the address of start_boot
3 Y+ B; I8 v0 \0 P# M; W. a - MOV lr,pc ; Dummy return
( }. E- y7 v1 r - BX r10 ; Branch to start_boot9 M8 j1 D& A4 ?! v
- SUB pc, pc, #0x08 ; looping
1 E1 S) f5 t6 S- ~, n4 J - ' G9 n0 C6 I" v; Y: m1 R
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
; [9 R9 s" o6 R1 N. A2 x9 D3 z - ; BX lr
7 _6 e' m! K. `8 a' P - ;
1 o1 t3 h x' y% V - ; End of the file
9 p2 W0 y$ D' x3 \2 V6 ? @ - ;7 S# k+ ]' f# w4 V* z
; h( x7 G9 R: b, C, h# R: r0 r l7 U- _stackptr:- D! I( o. l8 L1 G
- .word __STACK_END- u( g, i; |6 z1 O$ C4 x4 r
- _bss_start:
3 u* f2 X; K" v3 _" v$ ~% b - .word bss_start
, M& E9 K+ b- \+ |. { - _bss_end:# D; ^2 n: k" J3 i* \9 s
- .word bss_end& k: g% Z0 N, P4 o4 Z6 Z7 {
- _start_boot:
: s6 J; ] @0 }6 w - .word start_boot
% n4 I* i! B3 `, p6 x# F8 u - _data_auto_init:. Z( c' @: m" G, ~* w/ I& Y7 e
- .word __TI_auto_init" l- H9 d3 ]" s$ E2 c& c
- .end2 b5 d j+ v3 M+ J6 w
- ' x) M0 |9 b/ Q! k4 A7 `
0 N6 i" O) A5 z7 X& R
. d/ c1 p# V0 B& i5 Z0 x# p
复制代码 ' L& S' M6 h K
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