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0 p: z) O F. Y2 F# Y8 E) F1 Q+ \7 O在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
4 w) X2 [) H% p5 ]/* 重新配置程序入口点 */& x( h$ s6 E5 e6 E
-e Entry- /****************************************************************************/+ b$ g( q) L- T
- /* */* u# X& S! J9 u# ?1 @6 Q! ?# N. X4 q2 L
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */1 w% ^7 Z+ w8 o7 h- V& C+ K' P
- /* */, ~ ], w% O) r/ d+ O; Z$ H0 K" m
- /* 2015年04月20日 */! k- s0 m# k8 \
- /* */
. C/ O/ ~: o" k0 U+ `4 x; }+ J - /****************************************************************************/# w. p! h' g2 z
- /* 堆栈 */4 i" @' P7 D; U+ ?! r: C. Z
- -stack 0x8000$ x2 T' s! l7 V3 ?6 k7 X5 G
- -heap 0x2000
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* {" Z$ d% T' a6 W1 j- /* 重新配置程序入口点 */
' p; j" B7 i9 P' ~/ s2 G - -e Entry
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' b+ w1 g8 b1 @1 H- MEMORY
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- #ifdef DSP_CORE' _4 K. j* u: G2 \) I2 m5 s
- /****************************************************************************/
7 {( e0 J q" t; f* C9 x# X - /* */
$ p* s% h/ u# X - /* DSP 专有内存区域 */8 C6 S8 B5 e6 ?8 @% o7 \
- /* */
5 E0 a/ n- D1 `4 D; |! {1 o: W; G - /****************************************************************************/8 _9 V# W X, l) `6 O
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */0 W9 ?7 y& C& d3 Y* g
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
3 g& l0 n4 j. k8 V* Q$ ]3 h - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */ r v: ]* `$ R% j1 W( x
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */( u) R) |2 b3 L' d5 @6 I3 u9 o* m: r
- #endif
复制代码 这是一段汇编代码用于切换到特权模式
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8 I: K$ O: i9 JOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm$ u9 x. U" j% w. ^; X% D
- ;******************************************************************************
5 g9 k- z% i1 t - ;
, I+ F' z- n' a7 a4 r8 ~; }' W' u - ; init.asm - Init code routines4 B8 o7 q* B& y- B& k Z
- ;
* f! s2 Y6 {) u* B( R3 S1 a - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/0 d1 C K% [$ m$ t! z6 i
- ; All rights reserved.
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- ;******************************************************************************
( ?9 n& f% W+ [$ u" ^ - ;****************************** Global Symbols*******************************
2 c- b# I' L6 \" v$ w7 r - .global Entry
, t8 G; w4 u% ^$ y" p, S% E- j5 r - .global start_boot
) A5 N' p+ M; g) c - .global __TI_auto_init5 f% ^% T- c0 @. y
: Q! n0 ~2 h4 U) H! N- .ref __stack0 d! ~, t( C3 ~ z9 t
- .ref __STACK_END, ^! H* ~4 o2 D" x
- .ref bss_start0 D' M4 A; ~" y) L: Y% e
- .ref bss_end' N' r! A; Q0 C# F2 o: M
- .ref start_boot
\: p B: n& `
1 A# E: ^) n' u+ w$ G: n- ;************************ Internal Definitions ******************************) l, l% [% K: B, R' W
- ;
& g# I, t+ ]. \# H5 o - ; Define the stack sizes for different modes. The user/system mode will use" F2 |& V( W4 W
- ; the rest of the total stack size7 S* K% o7 y* H% B
- ;
# k- [, } Y. F* B6 S! Y
" g" d- k& r6 N5 O! s% L- UND_STACK_SIZE .set 0x8
' P9 \( @9 k+ y3 b* T5 f% {- Y - ABT_STACK_SIZE .set 0x80 G% @( D; ?+ c8 p; {/ N, b, j& x
- FIQ_STACK_SIZE .set 0x8
: n- \0 X4 N1 K3 }6 l0 K - IRQ_STACK_SIZE .set 0x500
' d0 @5 ?4 U2 p: d) A, ]) e6 [2 P - SVC_STACK_SIZE .set 0x8* D6 ], H9 u9 M! w$ v- c$ o" W
- ' j0 k* k6 ~7 i) _: }6 `! C
- ;
6 A9 S) j9 |; g% h* N4 A - ; to set the mode bits in CPSR for different modes y4 [+ o- p& y# R' g: @
- ;0 ]% s# n" ^: [, J S7 p# l# y
- " ^, K: x0 _5 ?! t/ z
- MODE_USR .set 0x102 i! W, c9 D/ ~6 d
- MODE_FIQ .set 0x11! w* h, l4 O) W8 o# }
- MODE_IRQ .set 0x12
* f" B7 p/ K$ p: z# {' \! Q1 a - MODE_SVC .set 0x13
0 ]. {/ a2 U+ X( G% D4 b - MODE_ABT .set 0x17, ^3 m/ k5 H; f2 t9 V0 E
- MODE_UND .set 0x1B
6 o" D2 b! n( b. s( _ C( o5 v - MODE_SYS .set 0x1F$ C- K, r- I' b% ^ [
- 2 ?. g5 O( {% S* B0 x' S
- I_F_BIT .set 0xC0
% _0 F! P8 ]2 {& |, ~5 Q* U
% ?& f" x* z# K+ g- ;**************************** Code Seection ***********************************
: |3 V3 K: b4 G - .text
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- ; This code is assembled for ARM instructions- b' W9 k; z/ p' ?/ r; ]( n
- ;
' h# M+ V, d8 \6 w n - .state32
+ o! e) d, V) o
* a& A- x; K2 m( P: a- ;******************************************************************************
- {( D& w1 d m% e; I" j - ;* l! y+ j: ?5 H% o: {$ y. `; \6 ^
- ;******************************************************************************/ f$ @2 S0 S( g$ |
- ;
5 U4 E: M4 F" b - ; The reset handler sets up the stack pointers for all the modes. The FIQ and
1 j; t4 A8 a* g0 C) }# U+ G - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the2 ~' Y0 ~7 P+ q# b; J7 t
- ; main() function. {/ }0 [( n! K8 T! I3 T1 F. E" z
- ;4 ?5 x% E& h7 ~* j1 k/ A' G
- Entry:
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- ; Set up the Stack for Undefined mode( D9 T$ n5 D- M8 F! W0 Y
- ;
: q0 R& {$ S' n - LDR r0, _stackptr ; Read and align the stack pointer8 g+ c/ O5 s; \- |7 p' W
- SUB r0, r0, #8
4 t4 n* z" Z- u5 u6 y/ h s+ r - BIC r0, r0, #7, l! N6 }5 u2 h) I3 `5 s e9 z- H% S% u
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
+ s4 H U# g$ |- A - MOV sp,r0 ; write the stack pointer5 w, C6 j% y* O( n) k! ]
- SUB r0, r0, #UND_STACK_SIZE ; give stack space
; g/ l$ u+ I: s - ;/ V. u9 }% f4 y* Z3 R
- ; Set up the Stack for abort mode4 e, _( _" x5 v6 }' @5 \/ V
- ;" A6 \9 g; Y" i% ] m2 a
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode2 r7 t; z. G3 \ y1 R. N* w
- MOV sp, r0 ; write the stack pointer
" A3 }5 o7 }: k, v# e5 ^ - SUB r0,r0, #ABT_STACK_SIZE ; give stack space( F5 h; _; O) e1 N- u0 K* B
- ;% s, z( V9 e$ I; D5 L3 L, Z
- ; Set up the Stack for FIQ mode
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- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode9 w' e D @; W0 \7 y
- MOV sp,r0 ; write the stack pointer- ]) m2 s1 u" _# {: z7 o; g+ ^* q
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space7 @) | d3 J# B8 F3 M
- ;
) S$ `' c+ c0 V% d - ; Set up the Stack for IRQ mode6 V8 U0 v E" I
- ;
3 v5 r9 t. L0 F5 j# P - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
6 [6 \+ U. G! k- C1 s& ?0 `; p! a - MOV sp,r0 ; write the stack pointer+ l/ g7 j/ ]6 E, Z; `) z
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
5 N2 W: d6 B/ e1 Q7 [7 k - ;5 n: P2 w/ A5 r9 ~* l9 P
- ; Set up the Stack for SVC mode% T: j+ x7 ?; ?9 m f5 a0 w, t9 F
- ;
1 d+ k6 x6 W( I" G: v, k - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode6 n- F% H1 q* G
- MOV sp,r0 ; write the stack pointer
" `/ g9 g2 l: f3 _) a4 P8 Y6 D - SUB r0,r0, #SVC_STACK_SIZE ; give stack space
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- ; Set up the Stack for USer/System mode! O; `" W% {7 c$ ^7 P: d! V
- ;2 n$ U* n. W# ?$ X6 F/ `
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode& E& \- j2 [ e; p7 ?
- MOV sp,r0 ; write the stack pointer
% s' q/ j4 \3 ~! \; M' x - - J- q9 v) k' Q% S
- ;* U0 c! D/ q* M0 ~1 S" y. {7 j
- ; Clear the BSS section here
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- Clear_Bss_Section:
( ^& g* b9 m/ P/ F) ]
! _) F8 k$ ?. {- LDR r0, _bss_start ; Start address of BSS4 s7 v' m |: x+ Q. f$ f8 |4 U$ e
- LDR r1, _bss_end ; End address of BSS
6 \ U# K9 [; ]6 C' } - SUB r1,r1,#42 z" x6 u7 t6 }* x- w" `: A
- MOV r2, #0! ~& c3 l- C: z* N: Z+ S' \! x5 a
- Loop:
8 X' o, y# e; M/ b - STR r2, [r0], #4 ; Clear one word in BSS+ ~. d$ U A8 D0 h! _: J
- CMP r0, r15 L" E- v9 v4 o! v- S+ N5 j
- BLE Loop ; Clear till BSS end
# |+ L, ?4 s$ x! S0 f r' K
( l$ Z5 O4 h* }! V% h- BL __TI_auto_init ; Call TI auto init
9 e: }8 }) n: _, t9 n - k( ^+ ?& @' A
- ;
* l8 h9 C# \7 J - ; Enter the start_boot function. The execution still happens in system mode" N- z( ~1 w1 Z% q; ], N
- ;9 n+ t1 g1 j; E a
- LDR r10, _start_boot ; Get the address of start_boot0 I3 H3 g' _; k: d! Y
- MOV lr,pc ; Dummy return , q- f7 l$ g+ S' }$ m; n$ F$ ~
- BX r10 ; Branch to start_boot- o: q$ u, B. d* N
- SUB pc, pc, #0x08 ; looping. I; E8 i" i6 `* F
: c _- u+ O) M, u3 W& H5 o- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
- P/ ?( q' t8 }4 G! N5 u - ; BX lr
3 v% `1 b, g# C - ;
7 J ~( `9 e, R' M/ f3 I% r - ; End of the file
8 I, e+ x1 w" I3 l' Z& |% G1 }. O - ;
; X5 [# c" X- u3 j1 v
. |8 q4 w: k4 H) o- T+ f- n- _stackptr:
- y; e/ {* h5 `6 o _ - .word __STACK_END" {, f% n7 N7 z, e6 T
- _bss_start:* V8 I6 K4 I7 c* S1 p4 W
- .word bss_start
3 `& q$ K T' G4 B2 u8 D+ y0 V - _bss_end:
) Y# K8 K4 [( l! Y, c" @ - .word bss_end, @' A) k& ~* m+ M# \
- _start_boot:) H* n: M. X, V/ B8 N/ N3 }. h4 @
- .word start_boot6 m6 A' f7 @, o7 X
- _data_auto_init:( S) U" W% F- U$ ?; O4 K
- .word __TI_auto_init6 W$ W, m8 M; f- S! \) ?+ x+ ?+ e
- .end# Y" ?! k8 B$ S( G- c( P0 V: j y& J
- 5 ?+ c: @ \8 A6 U; f5 r% M
- 3 Z/ T; v" Z9 u
- & V7 M2 k* V: E/ E7 P* O; ^$ @0 C7 c
复制代码
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