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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句( p9 C9 }. B8 z' O, P' u$ R
/* 重新配置程序入口点 */3 x3 Z. S9 [' ?
-e Entry- /****************************************************************************/
: \7 e) g G4 V - /* */. @* n. l4 b5 d+ x* _
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */
/ w3 c% M; _' v3 p7 ~" }; e - /* */
, `9 l; P' Z9 L1 U - /* 2015年04月20日 */& ]0 z& i& C: _" Y* b* a3 x0 T6 B; B, D
- /* */; r1 m0 R4 }4 q+ j
- /****************************************************************************// w- E; q9 @5 h
- /* 堆栈 */
6 B J8 `: e+ H9 q6 I - -stack 0x8000/ o# ]& H4 h0 ~" p. W3 j1 S
- -heap 0x20007 b6 E6 X/ P9 p5 b
- 7 Y7 E0 p u. Z# r' }3 j; e1 d
- /* 重新配置程序入口点 */9 g5 x/ a$ {' A5 f
- -e Entry
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* i% r5 m0 h- O- MEMORY3 x# Z: g3 [* g, f5 U* R9 b/ F7 G5 C
- {/ k2 K% V8 Z6 V7 r+ r- Q
- #ifdef DSP_CORE
! K0 H* {0 h, i. w2 O8 p - /****************************************************************************/
/ @# i7 r7 a9 F - /* */ Q6 y1 K! a# a; \2 e% ?$ S
- /* DSP 专有内存区域 */
" c3 z& s/ @/ X9 O. E0 l$ Z! { - /* */" `' }" `6 T$ \! t9 p
- /****************************************************************************/
6 T# T8 E0 X! w - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
, O e1 b8 n0 @3 B - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */) { f' w) V# t+ u6 ]
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */8 a+ D6 q# p; u
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */& W) d0 w3 w) f, n
- #endif
复制代码 这是一段汇编代码用于切换到特权模式& B! W7 v. U2 t( S" n8 b9 ]3 v
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- ;******************************************************************************
5 _' @: m: a: M) E5 |4 j2 s M - ;
* b2 B5 p7 Y% T/ T7 v - ; init.asm - Init code routines
3 \# m8 R8 {! G/ ~8 N$ p |- z6 q - ;
2 u+ Z/ `/ C; W# k& s' g! R8 ] - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
% Z2 I* B7 s' Y. B% _" G - ; All rights reserved.
! K9 R1 D- c ~6 w) m7 T0 | - ;5 A- ?* _9 X K
- ;******************************************************************************
" z3 ]3 {9 S9 h( ? - ;****************************** Global Symbols*******************************( L- o, z6 z% n J, T
- .global Entry
0 z/ H: f4 o9 O7 Z, b - .global start_boot
) E. x5 _% s$ V9 V - .global __TI_auto_init j9 E: A8 }4 P* f1 x+ U
5 G, H2 ]9 S( A D w( E0 P- .ref __stack' |4 Y% o7 L' Q3 P) J5 y
- .ref __STACK_END4 d3 Y* E. G) v# {: o
- .ref bss_start
# Q' K; H) B. }* a3 g# v( q* X - .ref bss_end
" V, G; \, O0 J. N4 C9 H - .ref start_boot1 r$ i( S/ m2 y2 }& _
- 5 |, {) _0 {8 o ^$ U3 \. R
- ;************************ Internal Definitions ******************************
" h, [* w2 \3 B - ;
; G. x( z& Q. b, e - ; Define the stack sizes for different modes. The user/system mode will use' e Z8 ~+ r. I+ M R" y
- ; the rest of the total stack size
; r% ]9 Z" s/ `& w" b( v - ;
$ w9 l( U/ J# Z# D+ }6 H+ [ i - # }7 [/ Y; Q; B' Y
- UND_STACK_SIZE .set 0x8/ Q4 h& R8 S. G0 E' V1 O
- ABT_STACK_SIZE .set 0x8
# Q; @, V& o" a9 b* W( C - FIQ_STACK_SIZE .set 0x87 Y# B7 m* ` i* L" p: p5 X
- IRQ_STACK_SIZE .set 0x500
' v; Y7 h" v0 H h; R$ e! E x* Q - SVC_STACK_SIZE .set 0x8$ `; @- g' Y7 H! l9 |- Y2 z1 S; Q/ B
- / V+ Q5 P! V2 }
- ;, }% d; B8 O5 Y8 S/ ]
- ; to set the mode bits in CPSR for different modes( [+ a/ Q! g6 [
- ;
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- MODE_USR .set 0x10
! i: D. j C9 F9 p: g3 O, B - MODE_FIQ .set 0x11
, u8 w2 J0 Z, f( d - MODE_IRQ .set 0x12
# X" i/ P7 D+ z! C- `# O( Y - MODE_SVC .set 0x13
. m& p( v' ~( t6 i" B9 H( w( @ - MODE_ABT .set 0x17
" |( }$ b# j- F2 S0 v( P! r - MODE_UND .set 0x1B
h- c/ ^3 L3 G% u$ Q - MODE_SYS .set 0x1F8 a7 T1 I8 ]; T% n: V
- , r2 M( }! e1 K3 ~
- I_F_BIT .set 0xC0
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- ;**************************** Code Seection ***********************************
6 w' C! e! P _) c - .text
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. e! m" e7 t+ E. m( E- ;
3 b, _- S+ ?0 f1 F8 g) L6 X! N* a - ; This code is assembled for ARM instructions J- ?6 [2 B# h+ U- }# f6 D
- ;
( J! z% I! m f' d - .state32
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2 b( t8 P5 ?- \5 N3 Z( `( q" e u. F- ;******************************************************************************
- X6 S! x# F% S# {0 ^" ]" h - ;2 v8 v6 [( L8 X
- ;******************************************************************************
1 X! j, S; s# k1 s6 j1 }4 b - ;7 Y D- _ c- N/ e
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and
' [& ^$ D! R2 G- p2 ^; P - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the' Y# p- Y8 X- I. D
- ; main() function.6 [2 `; X N6 J+ d
- ;
& E0 Z$ W( r1 h! Y) ?5 ?3 m - Entry:
7 ?8 w. H* G1 L* _! t$ D# ^ - ;
4 e* n5 M, a+ Z$ q0 B: Z - ; Set up the Stack for Undefined mode
! j. ^7 o9 t* I! Z h7 h - ;
: o* Q& @1 [) O- j - LDR r0, _stackptr ; Read and align the stack pointer
- U. F" ~& q% f1 n( Z- z - SUB r0, r0, #89 s6 K/ L! q q- ?" _
- BIC r0, r0, #7
! U- h' I3 y% t; q8 h - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode' [2 F- I1 T$ N4 A, F2 P+ R
- MOV sp,r0 ; write the stack pointer* ], a% ^" `) g" S
- SUB r0, r0, #UND_STACK_SIZE ; give stack space! g' M: ^% I) J. n' @- z# d+ \
- ;# P/ I4 m7 U2 a
- ; Set up the Stack for abort mode/ U( a6 g/ s8 G
- ;
+ m% \! F( a' H3 O - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode& W3 K8 M& f/ P7 X+ F# Y% @1 q$ g
- MOV sp, r0 ; write the stack pointer
8 a {% y8 Y% M0 H. o- f! [ - SUB r0,r0, #ABT_STACK_SIZE ; give stack space$ \& Y! {8 `, m) \& P$ V* {
- ;
1 r3 G' P" |$ a" q! R - ; Set up the Stack for FIQ mode* U. P2 j1 r0 l; R5 j% G* p X
- ;
, Y* E0 V6 B* p3 t: i3 I) D4 x - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
. i' ^. i; L8 x! Y2 w9 B, q W - MOV sp,r0 ; write the stack pointer
" S4 ^2 L* C; @- j( i - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space' w! R' x6 X! {
- ;
( \: c2 V& N6 g - ; Set up the Stack for IRQ mode
- m( F, `3 E+ k7 {/ f - ;# \4 C* c1 y. j2 G8 n& f
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode+ m5 j0 c* ]; b2 ~
- MOV sp,r0 ; write the stack pointer) k+ O2 M4 a9 C# ?- W4 [# h
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space9 v! b v* X# I1 F9 n
- ;% R' c9 a; s+ }' R0 j/ k
- ; Set up the Stack for SVC mode
& ?1 [+ N8 M1 j/ v/ R4 Q' ? @ - ;
% J5 R: p% A6 ~5 D$ w - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
' Z& M2 b' F% y$ x) u1 d" _ - MOV sp,r0 ; write the stack pointer) C4 W6 z% |/ w# z
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space
( _6 U, U+ G, o, ~ - ;
9 v ]6 n9 }& |) I' z" T' n4 G - ; Set up the Stack for USer/System mode
- a4 g/ A5 E* w# k! k2 W( } - ;
& q( e2 L+ G! S# T5 J) t5 { - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
. i/ l; F7 W3 X# w- I& r6 A$ i# u - MOV sp,r0 ; write the stack pointer
; ~3 i) ?, v. s4 w7 ?; K. U5 ]0 Z. K - 0 M) H; ^% M$ W
- ;# _* r0 W) B4 f: k6 O% o9 B
- ; Clear the BSS section here
R* R, y1 i0 o$ L$ ]8 v7 _. J. F( E - ;
2 Q/ Z4 M$ m. O6 v5 G - Clear_Bss_Section:
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- LDR r0, _bss_start ; Start address of BSS8 R o* R3 h$ j1 K
- LDR r1, _bss_end ; End address of BSS8 m& z9 B: x, r; `9 o: j- \/ H
- SUB r1,r1,#4
# r! C; k" e2 t, N8 O4 S - MOV r2, #0# T1 S" r9 ?5 L) e
- Loop:
2 a2 _0 e! L0 C( M - STR r2, [r0], #4 ; Clear one word in BSS6 I/ f9 M- y2 p2 f% T0 q
- CMP r0, r1
% _9 l9 m$ E3 u M g - BLE Loop ; Clear till BSS end
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$ i, x2 e8 ] q1 P, D' _- BL __TI_auto_init ; Call TI auto init
. S8 ?& i( F: u% Q; a& h. P - ) b3 b& e9 P0 w% t
- ;. }: Z7 r* W$ ^# Q! x
- ; Enter the start_boot function. The execution still happens in system mode8 D6 k$ o( `% _$ f) b$ |" ^ k0 b
- ;" @9 @/ \) _) Z: S/ ^ F/ k
- LDR r10, _start_boot ; Get the address of start_boot3 }' ]3 g7 p* e
- MOV lr,pc ; Dummy return
/ z* K; l7 P! F7 h' ?1 i% @8 v' ~7 U - BX r10 ; Branch to start_boot
_$ @& x, T9 I - SUB pc, pc, #0x08 ; looping
. \! w9 }- ]; R) \1 ^. D2 R; m - - \) `( h$ D/ M" X0 C
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode; k& K. o% \/ i
- ; BX lr
* d7 l6 [* K) ~ - ;
8 k: P' t+ O* t( N - ; End of the file5 E) K% u) R9 P5 L, ^9 `1 h! }
- ;
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- _stackptr:
; Z2 Q9 d/ ?0 |; a - .word __STACK_END
& c! K+ E+ ]: Y" T K - _bss_start:0 s5 @- K5 R) j) T
- .word bss_start- L, p n! W- j# t
- _bss_end:
& {- ]$ |6 {& l* h - .word bss_end
5 }5 \4 P( B! {& @% D! L - _start_boot:
& J- `7 r9 N( R$ P: Y/ {6 t - .word start_boot
8 A0 I7 N/ a* B& y V; ?0 X - _data_auto_init:
* T, u. e2 T: M) q! T* D" z - .word __TI_auto_init
7 i: P8 D i w - .end6 c6 k/ p0 E6 @4 O% I3 n7 o
-
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