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3 K6 C0 O4 H$ k7 M/ }在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句! x1 D* q' K/ `' b9 k c8 z
/* 重新配置程序入口点 */
3 Y1 k1 t5 y4 s: |, o# {. f-e Entry- /****************************************************************************/" a0 i5 q, [: R! ^) H1 x6 L+ \
- /* */
/ T8 u* j) M6 t, O - /* OMAPL138 及 DSP C6748 内存空间分配定义 */
& |. N2 y$ m2 F7 A, A - /* *// D7 Q" g' x, B$ A) j7 h0 h/ F
- /* 2015年04月20日 */+ Y% ?- F* J) M L7 F0 L
- /* */# u# y' ?- ]* a# J& P2 |
- /****************************************************************************/0 O' E" `. `6 M" \. { D
- /* 堆栈 */; N! | Z3 X2 M6 y4 X% u% [% |
- -stack 0x8000 Z" N" m- H+ f2 N) Y; V
- -heap 0x2000
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- /* 重新配置程序入口点 */; G! o7 o# u( G; q4 H1 ^
- -e Entry) {. B6 E+ s! u0 G& V( W) b K) ~
) v9 I3 ]5 \/ \9 ~& ~5 F+ ^- MEMORY
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5 `& ]0 U" m8 W4 H7 n - #ifdef DSP_CORE+ G% @, f8 ~9 `' O
- /****************************************************************************/
* k3 C* ^4 }7 p# I9 B6 D; D- P - /* */
- o+ P" m& `% \% L2 p" o1 c" @ - /* DSP 专有内存区域 */4 n+ q' ^8 Y5 X) M4 g3 t2 s9 C
- /* */
- I) O$ y b. r; c. Z" O% o$ e7 q7 O - /****************************************************************************/( c) u! n2 H5 b' n# s$ n7 s3 W
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */4 [0 L: i4 u; `8 g
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */& G7 i5 J0 J: c+ x) d
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
" l; V3 G/ W: n8 t: | - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */5 r" |+ o8 ]( F. [* w
- #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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- X$ p |/ {( jOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm" y% u8 @" D7 n/ a5 }( w& w% N1 ~
- ;******************************************************************************; J! F! B% `/ ]2 v
- ;9 \7 S, K! n& n* L2 ~$ u
- ; init.asm - Init code routines
: O, T+ ?# D. K' w1 X H* M* ^ - ;
; f) A) X9 Y. D - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/5 v& V* _2 N) S" n9 q
- ; All rights reserved.4 J$ ?% l4 \, J' X+ Z
- ;# M; k% E2 n, _3 z, w
- ;******************************************************************************
) s" B- v7 B! _' S+ A2 D - ;****************************** Global Symbols*******************************
a) B! ]( D+ r% |3 X% { - .global Entry
' O" F5 |2 g& a9 i! l( ? - .global start_boot% t f A+ h3 K7 K- y% d
- .global __TI_auto_init$ o2 b( u5 d" B
- 4 @ `) L8 `$ ?0 h5 ~6 C
- .ref __stack
: g, j% u2 _2 J+ ? - .ref __STACK_END8 `8 _; M3 l1 j: y
- .ref bss_start
" P& L/ G/ w( _* V$ B* ?/ h* J - .ref bss_end, P. N# }- C0 V
- .ref start_boot
- X1 j) L, Z; L8 {& g - 5 c B' @ J$ I( n
- ;************************ Internal Definitions ******************************
) k9 L* |8 W- \1 U* { P1 o+ k# q - ;
4 Y, z# ?2 v Y% a - ; Define the stack sizes for different modes. The user/system mode will use
! a4 J- w3 F6 N3 P' [+ l6 Y) a - ; the rest of the total stack size
% r& ?" T+ W, O2 y5 W - ;7 [& _+ B; k4 X- j* j" I
# g* \ K7 y: u- UND_STACK_SIZE .set 0x8) C3 A) O8 ~0 d( v7 k* J% V
- ABT_STACK_SIZE .set 0x8" [' B v" T D7 Y- v! c$ K
- FIQ_STACK_SIZE .set 0x8; e6 u) l/ ?4 U
- IRQ_STACK_SIZE .set 0x500
& o! ]( s, d2 A$ G1 f - SVC_STACK_SIZE .set 0x8
0 a% @7 X$ `* f; @% p/ R. k0 q& ]
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- ; to set the mode bits in CPSR for different modes
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% m2 [9 G# W3 \0 z& b4 q- MODE_USR .set 0x10
" e! u/ s% [" o/ \% s. z9 L - MODE_FIQ .set 0x11$ j9 a0 W7 Q9 z2 R& N$ C. W% `
- MODE_IRQ .set 0x12
( a( N1 ?6 |4 D/ A9 p/ w4 {5 w - MODE_SVC .set 0x13 ^9 c) X$ }" g# R
- MODE_ABT .set 0x17% E# N5 K$ P: Y" \0 {3 P6 ^
- MODE_UND .set 0x1B
8 W' U- |: ]2 O/ u9 y4 j+ c - MODE_SYS .set 0x1F
# q+ G; i0 o3 g8 \
! T+ F/ I; V0 u8 N- R" X- I_F_BIT .set 0xC0
: \; m- P X4 q" ?" p9 u2 {; I - 7 m9 S: g& t' k9 Q
- ;**************************** Code Seection ***********************************
" Z6 t# E5 {. W& {* o - .text& Z5 k0 G3 Z. O& u8 h/ Y. }* P
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- ; This code is assembled for ARM instructions
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- .state325 Z5 F2 L) ^% n4 ?8 R2 h
- @0 M+ R; P3 t( v/ l
- ;******************************************************************************
7 d2 L" w, y$ ] - ;
1 y7 U7 ]6 s; ?9 {. F' ? - ;******************************************************************************
- d4 {. c. u6 r( |: U ^ - ;6 w) S- q1 E6 o
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and: w! ?8 }0 X0 U1 L5 T% c; K' h
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
! H3 E$ c: G/ ? N - ; main() function.
O" r1 ^6 k5 R( T - ;
- c. C% P; O! `" ~0 y" o! P: f - Entry:
/ b7 _" a. \* x1 ~$ x2 C' Z - ;5 k! j" ~$ P( ~. B) |7 m) i
- ; Set up the Stack for Undefined mode# P7 u* {4 _4 O
- ;' ~( R( o4 _+ C
- LDR r0, _stackptr ; Read and align the stack pointer
' ?3 E% D) a- J( ]) q& o6 _) U5 C3 P - SUB r0, r0, #8! T+ U. Y9 u) ~( {1 @# k N
- BIC r0, r0, #7
% N* m. c, r# l& U$ |2 d8 y - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode$ Y) i' q3 u5 v1 A) w
- MOV sp,r0 ; write the stack pointer
. C; b. @8 J$ G5 j3 z' w - SUB r0, r0, #UND_STACK_SIZE ; give stack space
" i' Y3 L' W& x$ O. M1 ~ - ;
9 H$ K3 [8 J+ c5 L E - ; Set up the Stack for abort mode A! } N; v5 R* c0 V! h
- ;
/ U& x: K n1 ^; ?: n* [ - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode( M0 M i! a9 S
- MOV sp, r0 ; write the stack pointer
4 d' {. z6 \, G) o2 u& M' `8 w - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
1 z8 x# U5 U& s( S - ;
$ x9 T m1 k5 x% w# L8 q8 l9 C+ l5 k* L - ; Set up the Stack for FIQ mode
& L4 _8 {7 v/ M2 B, ~1 z6 g - ;
6 Q+ d8 \1 [3 ?1 _- f5 N# Q - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
% x) H( d% _' W0 b7 N( n - MOV sp,r0 ; write the stack pointer
$ o) E r& n3 |" X; N4 c6 [0 }+ ^ - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
# g6 N$ N, Z2 `9 }7 ]* B - ;% G: E, \5 j- r* g
- ; Set up the Stack for IRQ mode7 c" t2 g% U8 W% [$ P/ k# e
- ;+ o% z# A7 @. J" J, l
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
4 `" @; Z- r4 a7 O5 @( F - MOV sp,r0 ; write the stack pointer
/ C: h3 t; H2 D, Y- K- W2 ?8 r - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space8 ] w7 c" z- V/ u, j5 r
- ;
, j' n7 ^( h( N7 G ~- c$ o8 v& Q - ; Set up the Stack for SVC mode
8 F1 o6 a: ?1 Q( I" H ?2 l - ;
6 y; ~2 z0 o4 f. a# n - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
+ V& _: w: m1 C+ ~ - MOV sp,r0 ; write the stack pointer, u7 k7 O8 D& \6 h) H& L
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space; w: |2 z. b" [0 [( Z: u
- ;
8 e8 ~6 M# s2 A4 @" m - ; Set up the Stack for USer/System mode$ F) j m' F! O/ P3 N/ @. z! n7 l( ~
- ;2 a; N7 e9 d) r9 i' G( ]
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode6 L" c! o4 t$ e& H' Y' h
- MOV sp,r0 ; write the stack pointer
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- ;$ |! B% J9 u- J% h, a
- ; Clear the BSS section here! j9 S! ^5 p: y
- ;
" L8 J Q( ?1 ~* R( [ - Clear_Bss_Section:
3 Z4 s$ i: \, [! p) F - $ I. v( {9 k4 w9 Y
- LDR r0, _bss_start ; Start address of BSS
+ y. w% b4 U5 e( s; P - LDR r1, _bss_end ; End address of BSS( H0 e( `' S) n" @
- SUB r1,r1,#4) q$ ]: b8 l$ r* l! C
- MOV r2, #0
' Q- ~/ s% ]7 Q& l J0 \" ^) ~ - Loop:
) ]5 ^& H$ F' R - STR r2, [r0], #4 ; Clear one word in BSS
4 @* H1 N# x0 M" s - CMP r0, r1
1 U# ]# t& |" a( X, H - BLE Loop ; Clear till BSS end
4 x" z5 }* U" { [" m5 {. {
8 ^6 ?: k* V/ D0 w- BL __TI_auto_init ; Call TI auto init
2 N- E# C* y, l" g" I( c - # ^6 D1 c3 Z; Q$ c9 z H1 @) ]
- ;2 X/ W; V) ~$ [. l
- ; Enter the start_boot function. The execution still happens in system mode
+ m8 J% Z7 e e3 D K - ;: s4 X: X3 R, l1 Z! F2 L
- LDR r10, _start_boot ; Get the address of start_boot+ b) C( ? s& }2 n1 G1 H3 \
- MOV lr,pc ; Dummy return . f5 t9 q+ r0 L
- BX r10 ; Branch to start_boot( L, } q$ B7 o$ P
- SUB pc, pc, #0x08 ; looping! T- s, M' E8 \8 C3 ?+ K
- 2 E+ y$ S$ W; _" n+ u
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
9 t+ s1 B$ q1 Q1 k1 K7 X - ; BX lr! v: @. u y- ~8 O8 ^2 J; I1 I5 a
- ;
) @5 P4 R* Q0 @- [2 B0 M5 e' n - ; End of the file/ H7 Q- s. Z2 ~$ o- }5 n
- ;7 C- y0 [8 z3 g. Y4 K
% J0 M# i: |' i1 N! {0 f4 \7 i9 y- _stackptr:- E j% o5 s( O# x: t" x% W
- .word __STACK_END6 J% I- B6 P9 B* W6 R' |$ t" s
- _bss_start:6 T- B/ |) A4 X2 p; s8 I+ z
- .word bss_start1 q- m! Y7 r8 Q4 Z1 c+ B
- _bss_end:. N. ^5 g8 ~! p9 _
- .word bss_end
" n- o) _- o7 J/ w - _start_boot:
8 O9 ]! A) E @# ?# q8 m - .word start_boot
4 ^0 l/ Q7 N/ j- v% W( m - _data_auto_init:% x2 i% B8 }- [
- .word __TI_auto_init
6 @4 ?' `: C* A/ L% i/ K( U - .end7 u2 q6 ?3 v+ q
-
5 Q' ?' M7 X, R7 Q+ _
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复制代码 * u3 F2 u% o$ A" D5 c" C
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