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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句# H, h( S, f, H! o: x" @# q
/* 重新配置程序入口点 */) ?" x! E! q4 C4 r& _. F* w" n
-e Entry- /****************************************************************************/
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- /* OMAPL138 及 DSP C6748 内存空间分配定义 */. V9 M! k9 ?8 k
- /* */
3 U6 y0 M j+ u- ^1 V- h - /* 2015年04月20日 */8 x5 z0 G7 o+ A5 Q) ]
- /* */
% y H6 o0 W/ r# w- j - /****************************************************************************/
0 F' B5 ?) {$ v4 P( U( d) k - /* 堆栈 */
9 I4 v V% Y, [; l - -stack 0x8000& g5 p5 k& @ K- x
- -heap 0x2000; j' m2 {7 w7 Z! `% J. ]) D7 @
- 3 c& e' Z: n1 Y7 W9 b5 t
- /* 重新配置程序入口点 */
, }7 r# Q6 w$ k8 @! }% c4 s - -e Entry
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- MEMORY
# R2 b1 ^+ T. F5 ]2 z - {
3 s! a* l3 O+ p/ s9 ] - #ifdef DSP_CORE& b$ D$ D; b* J) B3 {8 Y) m/ h
- /****************************************************************************/
3 x) Q/ O, F1 p - /* */
! \- q2 T a1 b8 H1 F - /* DSP 专有内存区域 */$ Y. y6 J8 i* Q9 j3 b
- /* */
8 b: B! m& s) w e" J; y - /****************************************************************************/1 f) M2 z. K: g, D0 `' }: ~6 }
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */' p) j. |0 p) b8 g) Y
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
; A/ Z, n6 J% E9 V - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */0 u7 U: W' w M& J
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */+ R. X. N# }% x1 q! v- \
- #endif
复制代码 这是一段汇编代码用于切换到特权模式/ Y& s5 X( u. f/ X6 Q5 ^8 D+ g
( [# j+ n5 y% D' i8 j7 fOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm* `$ D d9 Q! ~# {6 m
- ;******************************************************************************
$ A( |8 s, m3 h6 @0 r" Z% ~: S/ Q - ;
6 x0 s' J0 S& z+ E - ; init.asm - Init code routines
9 v% r" F# a! v6 Y - ;
1 J% E$ L R8 k. r- W - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/0 X5 e+ i, r6 ^2 F9 |# f1 g
- ; All rights reserved.2 d/ W* z( K! V: J$ F' f
- ;
8 w5 J7 X9 Q; S7 z+ Q - ;******************************************************************************
o% C1 S$ w: H. r! o" H6 s - ;****************************** Global Symbols*******************************+ `% _) ]3 E* Q9 {* Y9 Y: S, V
- .global Entry
1 Q) [4 s* I% ~1 q, I - .global start_boot4 @$ @6 `: i$ Y) O% ?
- .global __TI_auto_init: L ?/ V3 @- p& X
8 C/ ^+ i" g/ z3 z- .ref __stack$ n6 E! Z+ [" ~6 v
- .ref __STACK_END
) o2 f) g9 E* d* h9 e3 p - .ref bss_start
# h4 S5 t) a2 e* h5 A" S4 m, \- s+ O - .ref bss_end: M5 H! R. W% `
- .ref start_boot% w% x& |8 `9 P' N0 D" z: ?* o
0 R% w! h- P$ M4 N( E# o8 f$ H- ;************************ Internal Definitions ******************************
6 O" g1 r. i. k" b: @% O. V( C; P - ;* Z+ `- g0 o# M7 \. z! h8 ^; A, @9 Q7 R
- ; Define the stack sizes for different modes. The user/system mode will use
6 I8 a+ \+ X. t' L - ; the rest of the total stack size7 I4 R, |1 ?" i. H: T% S
- ;& A6 _0 j, ~7 @$ ^2 h( c
- % \' \; I% d. V4 u3 V, }+ P5 e* S
- UND_STACK_SIZE .set 0x84 O+ W& a+ ~- o8 b+ ~4 ?* R' C& L
- ABT_STACK_SIZE .set 0x8
- |: s4 O$ X8 I, S' L - FIQ_STACK_SIZE .set 0x89 S1 [0 L P" E, d" e- p6 f3 w
- IRQ_STACK_SIZE .set 0x500' M; ?: @2 U& [+ J8 v8 T
- SVC_STACK_SIZE .set 0x84 N; k2 E$ d3 c/ p' b
- * P4 n8 [! X+ t2 F3 }- Y& H- L2 z
- ;
0 A6 J2 @: B1 L$ s9 n9 h( X/ r% i3 x6 m - ; to set the mode bits in CPSR for different modes
3 U. |, G3 N& F3 N: S6 c8 d! T9 A' T - ;
. ^( E- S* m, U. Y6 n
2 z+ J1 J! q; E* u# a& j% j- MODE_USR .set 0x10
r: n9 q; P( X& q, g - MODE_FIQ .set 0x11
! t9 H( @. k9 E. V1 z n! ]! l - MODE_IRQ .set 0x12
: R( C! W2 t8 v& k/ A* f - MODE_SVC .set 0x135 M0 E/ v( B7 i3 a' F
- MODE_ABT .set 0x17
9 `" f, K. Q# V+ Y6 K" o - MODE_UND .set 0x1B
2 ~+ ]# y( Q& g/ V3 q+ L: r - MODE_SYS .set 0x1F- ~( x) Y. K0 t R
1 @; O2 |0 a8 J3 S+ C* v. U9 @& t- I_F_BIT .set 0xC0& u1 n. B- O, H; A; P
" T0 S! |- F5 V2 U/ A/ V- ;**************************** Code Seection ***********************************
+ O6 w* b2 `8 ^3 L$ M. ^/ e - .text
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6 ]! v% U; Z ], E6 m) H- ;
0 Q7 m$ _4 z4 u+ L- o! X - ; This code is assembled for ARM instructions! x" V1 h* D4 D/ d0 V) n
- ;
7 u& k2 f9 Q( M - .state32
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- ;******************************************************************************$ {! a( J. |# s" k3 x
- ;
0 c% |. k1 J1 W1 K - ;******************************************************************************
/ e8 ]0 e9 e* X: C: {+ Q - ;
) V v7 y& A' z - ; The reset handler sets up the stack pointers for all the modes. The FIQ and
+ u) \! o8 E3 d1 m% b' ~4 U; X - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the5 _4 L* U7 [2 h5 v
- ; main() function.- |8 K" N. o' }7 A
- ;
4 K+ Q: X# f7 {, k- F% r. f9 a2 V - Entry:- v+ l: i; r& h7 V! f3 q$ e$ n3 t
- ;. \+ q0 b& t6 W/ e1 K
- ; Set up the Stack for Undefined mode
, d8 G+ f' f7 O - ;
3 y9 U! K1 d* |% Y2 f - LDR r0, _stackptr ; Read and align the stack pointer& E$ V. Q5 E" q4 a" x
- SUB r0, r0, #8
4 w2 e' i* U( o9 { - BIC r0, r0, #7
6 H/ [* }1 E+ S/ |) `$ b - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
# I/ `( L t8 D: c - MOV sp,r0 ; write the stack pointer
4 W2 K" [) M2 l% C' y' k1 _$ g6 g - SUB r0, r0, #UND_STACK_SIZE ; give stack space; ~+ C3 t; ?5 k6 W; i
- ;
$ O& b+ L( ~* X' V# b$ E5 V" r - ; Set up the Stack for abort mode' D# y7 B4 e$ N9 r
- ;1 F& P6 ^4 w e
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode/ |% ?! b# i5 t4 [( G
- MOV sp, r0 ; write the stack pointer& D3 v! ?* k6 L' x4 Y
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space: f! k5 A8 {2 R+ ~- T; r1 Q, p/ ?
- ;6 Z8 G7 I! C' J$ [
- ; Set up the Stack for FIQ mode- O: g- H3 W' u7 ]. J- O9 w0 u
- ;2 F0 R$ u' _7 d" Q5 s0 Y! _/ Y
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode" z% @; }, \9 ~' `$ \% a
- MOV sp,r0 ; write the stack pointer, d* Q \1 \9 |: F
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space1 \- N8 j1 J7 \8 C
- ;
% V! Z% E( B/ e/ F - ; Set up the Stack for IRQ mode
! I7 t1 C1 _% ^2 C$ j; ? - ;% I5 g+ f: `4 x% Y9 W' G( g
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
6 M0 k+ |* s* F$ b% h$ b/ x4 a% K - MOV sp,r0 ; write the stack pointer
3 W6 C' w1 R8 m% D - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space3 T0 ^5 B& W& L! @7 X5 ~
- ;
* a/ G2 T9 r0 ?% p, q3 m! S! X# h - ; Set up the Stack for SVC mode1 ~/ E8 Y& C- o, D. a
- ;
" u5 G$ i" J+ O8 {/ u% H1 e y9 D/ @ - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode, g+ {/ p7 z' z# b) n1 s
- MOV sp,r0 ; write the stack pointer
+ e; n' Q) w9 G- V0 ?0 A; U - SUB r0,r0, #SVC_STACK_SIZE ; give stack space: J7 r# x) J1 }9 _ c( f
- ;
" T. b7 r) p9 o8 W; Z& U3 t; A/ k - ; Set up the Stack for USer/System mode+ e: H3 c' j) J1 ~7 p6 O- d9 T/ ^
- ;
8 o" {, t& d2 h" d4 |5 X/ L - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode) c* \ Y) d. j: A5 Q& f* W* Q
- MOV sp,r0 ; write the stack pointer& X: ]( W3 g% Z' O* e4 f* |
- : ^' I) y0 K; h2 z. j) t/ f
- ;
& v0 ^1 c3 L* ? - ; Clear the BSS section here
' @ H/ m3 l! J0 h Y2 f- N - ;
5 }* y& `, o4 v7 z0 {6 ^1 C% @6 o - Clear_Bss_Section:
) P! [6 M7 ?: X. {$ z - 9 Y7 T* Q* k" g2 M
- LDR r0, _bss_start ; Start address of BSS6 T6 ?- H4 O) y+ H4 _5 D
- LDR r1, _bss_end ; End address of BSS
- a5 o6 w5 c/ ] - SUB r1,r1,#4
% @" J7 {8 ~$ P' x2 n, y - MOV r2, #0/ K+ @: Y2 t2 |( \$ c
- Loop:- r+ P/ F& l; A- Z+ u4 W1 b
- STR r2, [r0], #4 ; Clear one word in BSS
7 J: J6 y$ ~8 { - CMP r0, r13 y) P# Z$ V6 F4 f6 C
- BLE Loop ; Clear till BSS end
# \3 Q# ~ R s, U
6 M4 A" y* `5 b* P, ^3 {- BL __TI_auto_init ; Call TI auto init
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( A1 p- d- o3 a" ~' Q- ~. l- ;7 E; B2 r1 J5 a% x3 |% ^, R- x- h
- ; Enter the start_boot function. The execution still happens in system mode
* d6 ?- C' S* K - ;7 O7 d/ g$ l' G- T9 n9 R- W" H
- LDR r10, _start_boot ; Get the address of start_boot X' L+ @! u% t2 S3 w5 Z* O
- MOV lr,pc ; Dummy return
# a. @' M% M( R1 q$ }' f - BX r10 ; Branch to start_boot, Q6 N, |! n% U+ N" V
- SUB pc, pc, #0x08 ; looping
6 z/ O* H) l$ x" \8 x9 ^: p - * a! W9 G; j2 z, o5 Q( r
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
Z! `5 B' q2 C1 Z, K1 i! u z( G" Z - ; BX lr b; U9 u8 w+ W* o7 e$ \& ~7 A
- ;& k, j) n; C$ r$ S1 b, Y
- ; End of the file! K" K, X0 b2 b
- ;% y- Z) T6 M+ M6 ^4 s* I
' e% O# X( ?" g: Y- `9 E' @- _stackptr:2 y, D4 H- \2 r& G6 U; H
- .word __STACK_END. G$ m: w% ~1 Y
- _bss_start:" x% g( @3 w( {: H5 u% d
- .word bss_start; `5 ^# h6 K2 [" i
- _bss_end:6 a8 Z4 u( D% J. t
- .word bss_end, [% n" ^1 U* z
- _start_boot:
' s u( f7 V: K+ I% V - .word start_boot7 D; S$ @8 X8 ]- i2 a6 I# T& }
- _data_auto_init:
) X1 K& a+ {+ I3 [9 E - .word __TI_auto_init
% @$ [" n a1 D/ ?5 b4 C0 P0 `/ j& ~ - .end( l4 x5 x3 X; `3 L/ ^, ?4 ~5 ?
- # w/ R* ~ q9 @* b; G) J0 y7 S
- 8 g; Y: |/ ]' x" v% F* n# ^
& c+ ?) o# D$ O3 B
复制代码 5 @# ~) q3 c& ^7 h( r
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