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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
/ M5 n) ~; j8 K$ N/* 重新配置程序入口点 *// ?3 ^% T [( Q' F% V
-e Entry- /****************************************************************************/
. j9 y/ e) v/ F! M. M - /* */- {: `4 y8 t: Z3 U. t5 _- q' n, K
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */
@8 [- D' J, V% H - /* */
w# m' W! E# Q& _0 p - /* 2015年04月20日 */
. |" m7 g8 P4 G. D/ D5 g - /* */; L1 V) i$ M7 g$ B0 L
- /****************************************************************************/* X$ }# D9 o1 c4 T4 ?
- /* 堆栈 */" Q$ h2 a' P( z: f
- -stack 0x8000
8 I3 D6 @7 l$ f9 m2 d: S3 M - -heap 0x2000
# L& C" Y3 ?7 o5 Y/ o
" I$ Y$ B7 K1 c% b$ C0 C3 ~- /* 重新配置程序入口点 */
: |' M: s4 h B5 b6 ^; R+ G0 E2 J l - -e Entry
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# s& e) Y- S9 l9 ?- MEMORY
% q# R( a1 o$ P: p. z Z - {
P) d! p u3 c+ b# l - #ifdef DSP_CORE8 V' @3 U J, L( _- a9 l
- /****************************************************************************/3 y5 L# s' R4 M' w8 p" H% V
- /* */
$ G( h% D$ K, x: r - /* DSP 专有内存区域 */
! G8 g2 l9 R# h$ U - /* */
% v" k) I+ ^+ h7 X2 c1 x9 \- i% G - /****************************************************************************/( {0 ?2 v3 R" N/ `" h0 W
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
7 s5 H0 @ {9 R3 J' ~' Z% k - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */$ H3 s& ?: H, l% ~% M$ u' s
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
; }; I" q( m. O! j1 c; O& l; @8 u - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */7 m% i) D0 Q, P- Y4 d R0 T
- #endif
复制代码 这是一段汇编代码用于切换到特权模式$ n0 y1 \8 E* F( L" l6 `# l8 x) G
% p4 x9 c6 {/ b- ^. H. T% j2 c4 ZOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm/ P/ k6 C8 O- B. Y9 [. ~4 v# d
- ;******************************************************************************; }" Z9 v' b/ e. K( ~4 k
- ;4 l* K9 [1 A5 y
- ; init.asm - Init code routines
# P. H) q8 |( I, F9 R+ Y: I - ;, K. t' ]. z5 R$ a/ N
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
, `( Q: q3 y# I& v# l. X; E9 n - ; All rights reserved.
3 v, U% k; z3 `) A" ^8 V - ;* B! J- q* ~. W* I2 w
- ;******************************************************************************+ I6 @ p; Z" i& s! W4 O5 T: j
- ;****************************** Global Symbols******************************** f, ?! q+ {$ V0 o9 \( U/ [. W. L; U! i
- .global Entry
% e1 z& G7 l/ g1 a. J9 l, X - .global start_boot
0 Y; Z. i6 @* r* \9 D5 \2 o - .global __TI_auto_init6 x7 }1 c+ d; k! L) @2 g6 X0 T* y }
) G, {' o8 s1 X' h' H- .ref __stack
( M4 l9 p) }' n9 I6 F - .ref __STACK_END9 O4 e4 D2 z/ K7 D2 B, f
- .ref bss_start
3 J8 e1 p+ Z; Y! A0 J! P - .ref bss_end
+ X6 C" ?0 S' m. x0 {; Q$ k - .ref start_boot8 |7 e/ P3 q/ y( E6 D' L3 h) h
6 x2 d9 p) h r# {( s- ;************************ Internal Definitions ******************************
5 f5 K( w1 I$ \6 u! Q/ b% d' w - ;4 s$ I7 x0 P: i5 P; A0 J
- ; Define the stack sizes for different modes. The user/system mode will use
" ^6 ~0 N. G1 ?- H7 E+ W - ; the rest of the total stack size8 s9 t+ t' [0 h, [" v. C
- ;
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: n' f- I7 H- X& Z. A( ?- UND_STACK_SIZE .set 0x87 M9 `# \. @3 Z# c6 M+ F9 @' D
- ABT_STACK_SIZE .set 0x8
' U: c$ d9 q- N3 W7 H5 ]4 y- ? - FIQ_STACK_SIZE .set 0x8: T- e5 }" V$ U" y5 q0 D y+ o
- IRQ_STACK_SIZE .set 0x500' m, u% r, C% D
- SVC_STACK_SIZE .set 0x8 Y% g9 Y) |) z, P1 W
- 2 {, V* Q8 Y, V# S; R
- ;) v% t1 D G* N1 v8 K( L6 n M
- ; to set the mode bits in CPSR for different modes
- s4 B1 J- P; C% r+ D1 j9 h: x. _: J* e - ; H. ~7 O, p0 @7 u* r) k
* k' }; s9 f( \$ I" P- F- MODE_USR .set 0x10
& e. i9 B( q+ n3 j - MODE_FIQ .set 0x11
& X5 f( D! k8 Z9 `. B - MODE_IRQ .set 0x12 ?+ Z* O2 F, g0 r j. n
- MODE_SVC .set 0x13 a6 c0 C% m7 Z2 t" s! k9 V
- MODE_ABT .set 0x17
B- Z! ^, H7 O4 l - MODE_UND .set 0x1B+ v n' ?2 \( R! n& d
- MODE_SYS .set 0x1F h. r* u; _5 D! Z2 D% V: I
- ( n2 S0 o' j! g3 a( l
- I_F_BIT .set 0xC0
+ Z3 l! W- X; J0 M% B% J - ( f, p2 t9 }# G9 m$ @
- ;**************************** Code Seection ***********************************8 ~9 D& Z1 B1 L2 r$ Z. H
- .text# V* [* l. ?6 j+ U2 g8 t6 X
- ) g7 a; s7 ^. U0 ^) x- g* P
- ;' Y1 E4 ~* R' B0 N4 N, g% F, |# Q
- ; This code is assembled for ARM instructions
' X9 _& z. j, L" g& ~4 K - ;" Z6 @- K+ n. G: \9 Z5 k* u# a
- .state32
1 r9 H; w( ]! d. h# a: |: y - d5 \3 q+ u# [0 }
- ;******************************************************************************
2 Z$ S% U: L3 f2 \$ k% v; y - ;
2 |) p1 v4 Y6 ^# ]( Q# }- X# y - ;******************************************************************************8 {6 n* i1 O3 }6 r, j4 [/ n
- ;1 n* K/ |/ T1 b
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and
, x% {! B& C- i/ x3 _6 { - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the, O ~: I! M. Y
- ; main() function.
* i- B8 |1 L0 F7 e9 W - ;
/ W- W* T, z$ G - Entry: `3 P5 a# d! W# Q5 R& @
- ;2 n' e' U3 K. ?* E+ s# m" E
- ; Set up the Stack for Undefined mode
6 N$ X* v+ C' H8 H - ;6 a& c' L9 d1 K) M' ^8 I' S3 T
- LDR r0, _stackptr ; Read and align the stack pointer
4 D! d0 ^! b& O: U, D8 p5 N - SUB r0, r0, #8% D& i2 W$ j) n& w1 h# D5 G
- BIC r0, r0, #7( ?3 e: u. v' K% e7 _* l
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode3 h5 p) H- P% L4 q! r! Z
- MOV sp,r0 ; write the stack pointer
4 @/ E* p6 J2 s- U# K g$ d- } - SUB r0, r0, #UND_STACK_SIZE ; give stack space, G* t7 X; y7 C" F3 B2 q
- ;
9 a( X4 _# j3 n A/ F - ; Set up the Stack for abort mode
5 r6 ]0 [2 u3 N! R: S! D+ n( x - ;$ A+ G. o3 C0 V, ?# H
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
9 r5 b# H3 a8 T' Z ` - MOV sp, r0 ; write the stack pointer
: u1 A. ]" C) V - SUB r0,r0, #ABT_STACK_SIZE ; give stack space2 G. l. Y- s2 G" z; v! g' a% u
- ;8 D D5 |4 \( t$ v1 f
- ; Set up the Stack for FIQ mode
' c j0 n9 V7 K9 |8 @* m - ;3 t' X) K" O, B6 ^ S/ g! y
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode8 z t& i) X7 U1 w% Y0 ]) ^
- MOV sp,r0 ; write the stack pointer" W0 b8 O2 [" T- D* \1 |- b' l
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
+ \- V8 a/ O D. I) ~, b; X - ;
0 k5 {. \2 k) M - ; Set up the Stack for IRQ mode
. u+ {4 d$ C' d% Q9 p2 ^( S - ;/ Q) A. B% h3 X. j: q
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
+ [5 ^8 |! B# ? h( y7 b+ r - MOV sp,r0 ; write the stack pointer4 d. `) t% {, B7 X
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
9 L1 E3 K5 Q# ]! d - ;
. f" n% m$ K5 D- ]+ H - ; Set up the Stack for SVC mode$ l8 K7 m3 ~, D# E* O
- ;
. ]& R0 ~4 |( q4 t: T) v& L8 p - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode3 T# c" W: b3 I- i- e6 J$ D- `( T
- MOV sp,r0 ; write the stack pointer
, _* F, z3 s) B - SUB r0,r0, #SVC_STACK_SIZE ; give stack space
* j" I# M: J1 U - ;
! i7 k% s9 H/ r0 }0 A. r- B9 ? - ; Set up the Stack for USer/System mode
8 g7 h1 `( f4 `4 T* N' ^' Y5 ? - ;. |* J* K5 y% O- V
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode# h6 t/ ]8 S6 ]/ g: I4 r4 J
- MOV sp,r0 ; write the stack pointer
/ o+ @- B9 T& ?4 H; ^
! A7 V3 y- X! d y- ;
! G$ U O) R6 s' U/ U0 Q! j0 f, c P- g - ; Clear the BSS section here
$ G% h9 w) t6 N" C0 H - ;
4 T" C: h B, {. i - Clear_Bss_Section: q& ^* T; [" i' e3 P+ l
( h1 @! `- e8 ]- LDR r0, _bss_start ; Start address of BSS L3 I/ h( C% Z C5 Y: P
- LDR r1, _bss_end ; End address of BSS& u5 U; B9 F! v7 C2 D/ F
- SUB r1,r1,#4& L3 G+ V: L3 q: }3 P1 E
- MOV r2, #06 v+ Q4 d& m# \
- Loop:
( `9 v% C! r4 N* U4 G - STR r2, [r0], #4 ; Clear one word in BSS2 t$ S; a' @ n' w
- CMP r0, r1
8 ^+ G/ a* l; b0 A) z4 I - BLE Loop ; Clear till BSS end
9 E5 A& L& K0 l/ e
5 s5 a8 p, l! h. k# E B- BL __TI_auto_init ; Call TI auto init
9 D# f9 N! x: ]2 c& A - ) j% C( S" R" \. A- T
- ;' V& S+ B, h. f
- ; Enter the start_boot function. The execution still happens in system mode
. R) c. e+ ?# b4 \% w - ;+ \5 V' \; e7 M6 ^
- LDR r10, _start_boot ; Get the address of start_boot% A- s$ ^# N, d; x0 I
- MOV lr,pc ; Dummy return
7 ?% U8 [( d- c6 X - BX r10 ; Branch to start_boot, r: L: ~& ^$ M3 |
- SUB pc, pc, #0x08 ; looping
2 M' H9 L( w, i6 i4 J8 j - * t: c( Y8 c$ K# A, K, G
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
* i" s/ R& K0 U: d! H - ; BX lr9 z H- n" X8 o
- ;
6 W( G4 H1 i: J4 ^9 E - ; End of the file
1 C7 q; Y5 t7 @! Y& ` - ;: I1 ]3 g% x6 g7 U
- ; D7 }1 H3 ^; S; A" j
- _stackptr:2 l$ |6 y& m% K K: A
- .word __STACK_END5 N. s2 q) X* Z2 w& d
- _bss_start:# a( i0 \* |+ @
- .word bss_start$ R+ I# V: [ X6 Q) d0 P
- _bss_end:
/ }' x: h. r( \# ~* q# b - .word bss_end+ F1 e9 S; J s! [2 D' N J
- _start_boot:/ J T5 L/ F; \0 P2 B6 ~
- .word start_boot8 J$ P8 V1 }) k) F4 _' T v
- _data_auto_init:
: R G# j0 |: k% g - .word __TI_auto_init6 j0 a- P; D- N% @
- .end* @/ b# s+ e/ Q" u2 E$ u; R
- - [3 P* O& N* l, X
2 }- U0 Q6 f. s+ L& {) l! |
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复制代码
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