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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句3 o; z: P% s% P2 X6 \! H" `
/* 重新配置程序入口点 */. i" e1 [/ O, J! j5 Z9 Z7 {
-e Entry- /****************************************************************************/( a- m: g" U$ }6 E. \
- /* */
+ j# N0 `3 L+ k2 V2 r - /* OMAPL138 及 DSP C6748 内存空间分配定义 */; f# z' \# j8 r* T
- /* */; w6 s5 o% h. C5 a2 }
- /* 2015年04月20日 */
6 ~2 i1 k+ S2 O: T7 w5 h - /* */. [" @; Z" a( y7 T5 ~4 r* X- e
- /****************************************************************************/
. J2 N) v2 {9 |* U4 {( Y - /* 堆栈 */. ~/ J6 ?0 a z1 b5 x, Y0 M0 X5 E9 f
- -stack 0x8000" s% ]* _* B2 r9 `6 r4 }
- -heap 0x2000
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8 n( i/ p3 I- g! d( _, s- /* 重新配置程序入口点 */
! W5 J( x* ]2 k+ d! F6 A, p - -e Entry
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3 h% u0 P u' j# @, w- MEMORY# y6 p6 X4 m1 I% y' S6 _
- {
+ H6 y8 m1 J1 o. J: x - #ifdef DSP_CORE
" N* K2 d+ o# l* x5 `; [5 J- y1 n - /****************************************************************************/1 F2 F4 S1 b( I* O+ H- W
- /* */
. p4 p. Q/ ^5 n& A* L* f - /* DSP 专有内存区域 */) c* r. w+ }! Y c8 V
- /* */
: \2 i+ T! q+ ]" c% i4 Q - /****************************************************************************/
# G- l' U: ]) Q. t0 p) U T2 Z9 } - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */* b, ^* B/ Y+ ]# ]
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
3 O' ~# ^; d9 |1 L2 ]* a0 }6 D5 u - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */" x# a/ G9 w8 ~! X" W" G2 ~
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
! r( F$ t4 x8 I) a+ X* K - #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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OMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm% h& y4 U7 ?' T2 p/ {
- ;******************************************************************************( j$ C+ q1 \' d( L. R4 Y% c R
- ;0 z6 _ M% a' `7 P- T9 Q7 D
- ; init.asm - Init code routines
; P( i# @- Y- U3 i1 n; P - ;
0 N" k6 W4 t6 h* H+ ]: U% K1 D - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/, m1 n% N2 z& k y% x
- ; All rights reserved.# v6 [* N0 h8 {( B7 n0 ]) x
- ;- N3 {& m' e! i1 k$ V: G( g" u a
- ;******************************************************************************# K$ y. h2 \6 E6 F1 x9 a8 k9 C- v
- ;****************************** Global Symbols*******************************5 K1 f o/ a8 q5 \; b2 G0 w2 h
- .global Entry
( D% \5 V* C. m- c1 Y2 `8 ` - .global start_boot8 O& v0 {! b, c9 K7 B6 @ C
- .global __TI_auto_init) ]! T |4 x8 H) L
F1 \# T3 V9 F) h# a- .ref __stack6 R/ S* r6 u$ R8 D3 v: v0 `: i
- .ref __STACK_END- x- J5 n7 Y% D, H( h4 B$ v
- .ref bss_start: ], e3 U% K5 V; i5 c8 \
- .ref bss_end
. N7 o9 w% Z9 L/ T) T - .ref start_boot
* s8 M) w. y) B - ( V2 \: i4 ~& ~
- ;************************ Internal Definitions ******************************
6 S$ d5 L/ T0 A' [; G" Q4 l$ j. l) D - ;, Y W% z" F, }
- ; Define the stack sizes for different modes. The user/system mode will use1 f' E2 D$ l! _7 k& q$ C
- ; the rest of the total stack size; s- Q' E% y4 f7 Y
- ;
% L* d7 N2 N! X2 I6 g( a% D K9 w - " L) L- m8 u x6 j! ^3 p- C9 n# a
- UND_STACK_SIZE .set 0x8% @* p& O+ ^- `* i9 S& ~
- ABT_STACK_SIZE .set 0x8( Y# B W( J6 V1 t5 X4 J" i
- FIQ_STACK_SIZE .set 0x8
: _2 a' o. b/ ~& | - IRQ_STACK_SIZE .set 0x500& W& M& `; O" H: c9 a4 e n
- SVC_STACK_SIZE .set 0x8- H5 \/ a0 H1 b7 S
3 ~3 [$ C3 y. B$ L$ ~7 V. J5 d- ;: Y) e6 F( s8 t9 K- F$ C/ N
- ; to set the mode bits in CPSR for different modes
, a6 c s3 k% | h# L, o5 E - ;2 l& w4 k6 c: C5 X8 d
- # s8 f: E, e( j$ P0 p
- MODE_USR .set 0x10
+ x, ?( q" r; ~5 q - MODE_FIQ .set 0x11' q" p0 b( V m
- MODE_IRQ .set 0x12
1 {/ b; G! a1 S6 \0 D - MODE_SVC .set 0x13/ {* M9 Z2 j J# F. x/ O
- MODE_ABT .set 0x17
) Q' V% }' J$ C# P0 L - MODE_UND .set 0x1B0 l5 N, _# W, V" [' s9 X4 m
- MODE_SYS .set 0x1F
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- I_F_BIT .set 0xC0
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# \: ^6 r% N! \; O- ;**************************** Code Seection ***********************************
. ?# e# ]1 F- C# i - .text
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- E3 v0 E6 r' D+ S' M- ;' w9 M+ j0 W7 A6 f. ]# q. g
- ; This code is assembled for ARM instructions, ^: {* h4 c+ Q' z: J4 y h3 H
- ;
5 w, g" R$ i; f6 |: E - .state325 V/ r) ]! V1 o; X4 X
- 4 Y& k h- p! Z# f* H
- ;******************************************************************************+ W+ V @6 O, X( O5 T; B
- ;
* Q2 f' I( Z& A( D; S6 }/ y+ s) d - ;******************************************************************************
6 H9 X( k! ~% i1 O. G; R% g - ;6 V8 Y! a r/ M) j, g6 M
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and
9 U( y3 w. c; W, v - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
/ j( b7 \# w7 X3 l' x2 K0 _ - ; main() function.' }$ S+ U* c. p! j
- ;5 D3 [: y C4 F2 c W
- Entry:7 n. N1 g5 `( p6 D7 J
- ;$ l8 p* Y* P" V, j3 J
- ; Set up the Stack for Undefined mode) S/ b8 p- U9 m! q- l& j. p& a
- ;( s ?, u5 E3 t5 ]! f2 R
- LDR r0, _stackptr ; Read and align the stack pointer
# y+ U$ x" X3 U% ~# B0 j1 N+ q# ] - SUB r0, r0, #88 A2 ?" y8 e d/ J) N+ l0 x
- BIC r0, r0, #70 _2 F, C6 K2 B/ o
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode: l/ v" j# K$ r3 L
- MOV sp,r0 ; write the stack pointer9 h% y4 q0 A2 ]: M" R4 |9 z* c
- SUB r0, r0, #UND_STACK_SIZE ; give stack space
5 J& o' C: O8 k5 q( O. W - ;
* G9 \9 I' {- }& v% ?/ T - ; Set up the Stack for abort mode
) ?; S" \* \) T% d( T- ^ - ;
& i& E" k% p* q. l0 u* \# Z - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
; [4 N5 d W( q3 T' \9 b - MOV sp, r0 ; write the stack pointer$ \- {9 U3 }- Z1 m9 n
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space
8 {* N0 f7 C% w - ;
3 W: u. ? {3 R" g1 O+ y - ; Set up the Stack for FIQ mode* j- Y5 B$ S0 L8 Z; R" m
- ;
$ M" `% z$ ~/ b3 H: O - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
: o% L2 E: N+ A$ ]$ o% Z6 M - MOV sp,r0 ; write the stack pointer
2 B( e+ F& q7 |8 [ p - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
5 f" f( J. S" Z; z - ;
2 c2 ]! @ }- B6 j; b7 ^ - ; Set up the Stack for IRQ mode4 N1 @7 I- K. `7 F5 z
- ;3 _& k4 `. O2 f1 ?; j2 n7 q2 ]
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
( j" Z0 _+ i4 R$ G& v+ O - MOV sp,r0 ; write the stack pointer
0 R: Y8 t8 Z0 N8 H% y7 I2 A5 n - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
2 Y9 M5 V! L" G: X - ;1 `" ?5 q" \, g8 I9 L4 T! L; ~
- ; Set up the Stack for SVC mode
3 H- S) x: l7 X* N# w, b5 o - ;
* Y, n6 \. E7 p& B( x0 d - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
1 r" U( G$ h! h! }! n - MOV sp,r0 ; write the stack pointer
! M& S; B1 s1 ]7 C4 C& \7 n0 f - SUB r0,r0, #SVC_STACK_SIZE ; give stack space
8 ~) k+ J0 `/ S* S' ? - ;' a/ R, r% l1 t) q9 O5 M
- ; Set up the Stack for USer/System mode
, T3 Y* \" k4 w# q! n# O' k" E - ;
; ^7 t& M: w6 x$ _; V9 S - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
U/ k7 O G. M- a - MOV sp,r0 ; write the stack pointer1 z9 b2 A. F7 Y) ?+ D2 R9 @
- 6 l1 V. \2 b$ X& Y$ c
- ; G: R( M1 \; y
- ; Clear the BSS section here
/ Q* X. h+ G9 P! w o% J: v) b- y5 C - ;
6 M F' A$ z2 F+ k8 q+ { - Clear_Bss_Section:
# n; V/ {2 v, }3 z - ) V6 Q% I& \! r, w% R. |
- LDR r0, _bss_start ; Start address of BSS
' A, X* a% t+ U, e8 E% l - LDR r1, _bss_end ; End address of BSS7 E' {" w5 a1 @2 d" C
- SUB r1,r1,#4' _) d% N! v* }4 }
- MOV r2, #07 K# W2 L, Y' Z8 U
- Loop:
& t m) }" R ]& c$ ]5 u - STR r2, [r0], #4 ; Clear one word in BSS
$ d& ]% ?$ m4 f8 C! C2 L - CMP r0, r1! ~( ~& U2 X: q1 r( j' ]
- BLE Loop ; Clear till BSS end7 L9 n$ z d; L% _( Z& j
) K! H0 `/ V! h: r1 v- BL __TI_auto_init ; Call TI auto init h2 W" K& ?1 ~" ?" u8 F
+ k: G2 W5 V$ k6 m" z8 M7 Z9 \- R- ;
# q( F3 ^, \5 F( C1 `- r4 L - ; Enter the start_boot function. The execution still happens in system mode
4 |. L6 ]+ X+ C# w: I - ;
% s- Y) }9 f% o - LDR r10, _start_boot ; Get the address of start_boot- ~% U: Y, M( `/ r8 ~- `
- MOV lr,pc ; Dummy return
- \ w* N" A7 F" g* h1 ` - BX r10 ; Branch to start_boot# K) }2 L9 }' y$ }$ f* `2 z. W
- SUB pc, pc, #0x08 ; looping
c M) H# H5 Y* Z
" s R N! g! @6 z3 {" D1 a, ^! m- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode$ k4 F% X8 w; X2 w3 \
- ; BX lr
" ^. Q" R) W1 X4 I* W' t - ;
: _' F; d3 H& V$ f! i2 B - ; End of the file
$ }3 y ~# G7 r# H$ u# F - ;) b' w# ~4 X! D3 C2 k
: Y) z5 p7 v6 N3 h: R: y' o' u5 a- _stackptr:
/ Z- z5 K( t1 C% y& n) h8 ~ - .word __STACK_END6 ~( w. q- r" q" d* Q
- _bss_start:
+ @- m# w4 I! W4 O; ` - .word bss_start" d0 e$ k1 [1 P4 l
- _bss_end:
+ h( s& O- ]9 y1 X- p. i - .word bss_end7 P. i5 J, o8 G7 X; {" i
- _start_boot:
' ] `% _+ w; A+ C - .word start_boot% u7 w1 `. W( C
- _data_auto_init:) T8 I( C- {9 O2 J1 Y: e1 {
- .word __TI_auto_init
& d$ d2 I0 z5 ~3 o/ w5 p - .end- F( {$ n- ?0 I" r# N# H, O/ b% s
-
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- & O% m# P$ l0 Y/ s: |* C
复制代码
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