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. x) ~" k4 l" u! Q0 d I" W! z8 u在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句1 I* V/ d8 Y# v" s# U) |' k. \
/* 重新配置程序入口点 */- p: j/ B* b9 H) m1 Q- {8 Z
-e Entry- /****************************************************************************/$ ~1 r" ` R2 g/ r2 i; M
- /* */" X% e0 J U2 N2 G* A/ ?" W; N
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */+ N) M5 O3 [* a0 t' V
- /* */
8 }- ]+ H! {+ } - /* 2015年04月20日 */
- W; b5 R# {3 b; F }% S# Q% D- D - /* */
1 W* _8 ^/ H! m+ X$ U5 M! Z - /****************************************************************************/& Q. n/ C8 y5 r2 ?
- /* 堆栈 */" t- F2 f8 _" d" y; q0 C
- -stack 0x8000
6 M% |" k: F( e - -heap 0x2000
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! w% K; G* R! {" @5 Q& F- /* 重新配置程序入口点 */' x# H, ]' }/ _) U0 D
- -e Entry
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- MEMORY
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- #ifdef DSP_CORE
/ N) e4 R8 S* D& r5 t - /****************************************************************************/' z; a0 P6 M" ~& v$ u) [8 z
- /* */, m, C( c# x/ S7 D: ]* ?
- /* DSP 专有内存区域 */
7 l* B* x' I) L* c: Y5 J - /* */4 W! a. X& ^5 M3 w+ v
- /****************************************************************************/; k& E6 X# _; O1 d6 G
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
. N1 C q5 w+ E - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */' M* z3 U* D u! K8 a: |1 l
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
, S6 K# z# i$ o# R( j - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
2 g: h/ ?7 n. v# n, ]9 N9 y; 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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* [8 Y! g; M, P$ B3 WOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
" U1 d" D4 O! u0 j- ;******************************************************************************$ ~0 X# K! a& e( O
- ;1 t; Z5 R4 F7 Z
- ; init.asm - Init code routines+ R0 p8 S1 F$ Z1 ?! K, B
- ;
* G, b* L! Q# R( C8 q - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/+ Z* N4 Z8 j! N& c' s+ C2 u! O4 k
- ; All rights reserved.
; K4 ~" {* p; e" i' l. b; u - ;- U2 R" Y6 T; Q: X& Y6 \
- ;******************************************************************************
# g8 g+ s1 @$ p9 Y, B) N - ;****************************** Global Symbols*******************************
3 b3 p' B3 B% I$ z5 M4 |. e& h x - .global Entry
: Z* T) U, D- L6 I. K& y - .global start_boot
4 v& I4 z, D2 B; c# ~. X" f- ` - .global __TI_auto_init
/ w1 Y! v( v- ?$ R
# J* W) K0 }+ L* K6 a- .ref __stack
6 `8 ?1 Z3 v8 n( n1 ~. u* e - .ref __STACK_END, ?- J( W( g8 J
- .ref bss_start
' I" j! v: M0 \7 w" y: |; B - .ref bss_end
0 z; m6 E- o$ s - .ref start_boot
7 y+ S" h! _5 {# b; g! ?( o: }3 i n - - G" ^7 K& P) g& K
- ;************************ Internal Definitions ******************************0 E0 t7 f2 [* ^- j% x; p% v* ]5 j; Y
- ;
$ @2 ]/ }, V) Y) V - ; Define the stack sizes for different modes. The user/system mode will use6 H) i3 {- `5 h7 K9 B4 c
- ; the rest of the total stack size, t+ u, ]( }( q! |4 y
- ;
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" L0 s: M! y4 ?$ T% X) q- UND_STACK_SIZE .set 0x89 H8 K1 |) ?: d g4 m2 U/ D
- ABT_STACK_SIZE .set 0x82 F1 d. g1 G: ^, j1 O- b4 X( k! k. j
- FIQ_STACK_SIZE .set 0x8
+ D* p6 C& A: I. ]" d - IRQ_STACK_SIZE .set 0x500
: D4 C/ R' U" S3 H# {$ \' L' O$ r - SVC_STACK_SIZE .set 0x8
* q3 j0 O) Q7 I& W1 v" W. t0 h - ; l- G: Z7 T. y5 s9 u) N% Z; j9 D
- ;; {' ?" ^3 D" m. M
- ; to set the mode bits in CPSR for different modes, {, I4 ?8 F, G0 K+ z/ [ x
- ;
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- MODE_USR .set 0x10! z) \7 ]# i% Y: T( y: {
- MODE_FIQ .set 0x11( @, }1 w9 ? y7 [
- MODE_IRQ .set 0x12) T1 G; P9 R& z, j8 d4 Z- H+ ]
- MODE_SVC .set 0x13 f" A# N7 ]/ O4 i) f; k" G2 D) T
- MODE_ABT .set 0x17# e6 v* v7 K g8 T* I6 S$ e
- MODE_UND .set 0x1B: p" \5 Y3 q* ]3 L! `. d
- MODE_SYS .set 0x1F. a7 ?, O( F" z
+ G2 r. F: P/ r5 |% I6 R5 W- I_F_BIT .set 0xC0" i) v8 }7 g7 ?. d$ Q$ C% o
- i1 D) a9 b" D N5 }- ;**************************** Code Seection ***********************************
Y% h% B; v8 {* h2 F; }8 w - .text6 i' F$ ^% Q' }
3 i, y- ~2 R8 |5 o- ;5 A( v1 K) o7 a3 B7 U# Q
- ; This code is assembled for ARM instructions
/ o. t* p# \& } - ;
& z0 R3 H$ p0 Q5 H0 {+ v% R - .state32
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- ;******************************************************************************0 ^4 w9 b6 y# M) Y
- ;
. U! @7 U% ?' z- v5 C& x! v% z - ;******************************************************************************' g1 D& W* d8 N% d" V( g
- ;
" {9 k1 ~, T2 f2 [1 z - ; The reset handler sets up the stack pointers for all the modes. The FIQ and
3 c; ~% Z( h. S, c4 k; w' t7 F - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the0 f @4 Y8 _* ]% ]' C: c9 y
- ; main() function.* B5 ?' W/ ?6 S4 ~. f/ X% m
- ;
" H' \( f* T4 Z, r0 b - Entry:8 B/ K" P+ n& X. ^4 w
- ;
7 L' N/ t A- B0 `1 [8 m - ; Set up the Stack for Undefined mode9 B- w8 W; K; J4 i a
- ;8 Y) f3 t: q- r; }& x" O
- LDR r0, _stackptr ; Read and align the stack pointer
! e# G( \) V- K4 g7 N - SUB r0, r0, #8# ]2 H; I; C, j! k7 o: V7 ^# q [
- BIC r0, r0, #7$ E6 j: a# J2 }( a$ _0 M0 H4 }
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode9 d+ f' x" n* T! P! g
- MOV sp,r0 ; write the stack pointer
' g2 }) S; x; _$ Y- N) A - SUB r0, r0, #UND_STACK_SIZE ; give stack space
' S$ l' m$ j2 d7 W - ;
/ A0 H: X: B7 H$ [ - ; Set up the Stack for abort mode
2 H d& v7 P/ r& v r - ;, \( D. B7 {7 U% v r
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
9 ^( ^1 Y3 ^, G7 S- ?3 J" q9 A& ` - MOV sp, r0 ; write the stack pointer8 ^: i" B, L# e: Z
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space- O+ \5 \" d# W' U3 W+ S
- ;# O; L2 r# A. M8 p# z6 D
- ; Set up the Stack for FIQ mode
. s7 T( o- C% s& `7 @ - ;- g( f( h, |$ K
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode0 _$ ^1 r7 x8 j
- MOV sp,r0 ; write the stack pointer% o; V& {4 y* G S0 d
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
, }# V; R+ S& X2 x3 }" z - ;
+ }( `- y" [0 r1 o/ l# d - ; Set up the Stack for IRQ mode, q6 I; M r- Z, S2 ]% F+ }0 r3 F
- ;& h: j) V. ]" D
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode( y. K" Z, p2 r( v
- MOV sp,r0 ; write the stack pointer
H3 I! u0 j% |7 W. T9 ~* v9 D - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
/ @! y' N# h+ m8 t* g. \4 d$ t, J - ;
0 r" ]6 v6 q1 E# O - ; Set up the Stack for SVC mode. D* z( T F) W4 K* [
- ;
3 v+ C, d o( C ]8 _5 l - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode9 k4 o2 h4 V$ h: n9 u3 \
- MOV sp,r0 ; write the stack pointer
3 {- P1 |. z3 F1 x" k - SUB r0,r0, #SVC_STACK_SIZE ; give stack space {7 A% H c4 i
- ;( Z5 A. `% K3 m2 H( `0 e3 [( G) G; t
- ; Set up the Stack for USer/System mode
- M6 c' x3 O/ X2 z! ?* j& N7 w$ b - ;8 B5 z" b+ |# z& w& z* ?
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode' ]+ z, O/ A0 {- J+ @+ @0 J
- MOV sp,r0 ; write the stack pointer0 N+ j" T5 G. o! f# G
8 h1 H, `$ T/ C: K; G- ;
b/ _& e0 [0 @" V9 b4 K - ; Clear the BSS section here4 h0 G/ H7 T2 `! E) _8 [$ N }
- ;
" X4 P/ ~$ N+ x+ z4 L: Y' V - Clear_Bss_Section:5 j6 N6 n( M. I' [/ n7 ?
- : |6 Z! x X! D( J% ~* h
- LDR r0, _bss_start ; Start address of BSS* }9 ~1 n/ i- G4 _; k+ |8 g
- LDR r1, _bss_end ; End address of BSS
2 u8 U4 ?' R, k3 G% V - SUB r1,r1,#4
7 Y5 C0 b+ i. ?# K& {$ A - MOV r2, #0
5 M2 k9 f4 r- p' C& ~ - Loop:
: {% z. g* I, K' c+ {/ `9 C - STR r2, [r0], #4 ; Clear one word in BSS
0 K4 H5 m; u5 c9 O3 z- r - CMP r0, r1' H% I0 o# }' l& @8 E, F3 X
- BLE Loop ; Clear till BSS end
' t. p- ~5 y6 B* Q3 c% g% A
* n# o- w4 g8 X$ D, B- BL __TI_auto_init ; Call TI auto init. z1 I1 i( Z1 X" |' A7 ^
) r7 m. C* E/ y H8 ?, k7 Y- ;
; w, j: Q4 Z, a/ e4 v0 f/ y - ; Enter the start_boot function. The execution still happens in system mode
* ]$ j- T: c, f - ;8 H4 X3 \) s) J2 f* S- H9 t S
- LDR r10, _start_boot ; Get the address of start_boot
7 ?0 b1 E q" G* _" v; T' ]1 g - MOV lr,pc ; Dummy return
; n( B( j) k/ S. V: Q+ _, D - BX r10 ; Branch to start_boot% Y$ h0 W0 a$ J. [9 ~/ Q7 g9 H
- SUB pc, pc, #0x08 ; looping
0 K4 e1 \# [$ z - , K0 P( h# q1 O; ?4 I( S' c0 L
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode8 A/ e% v& ?+ Z! w* c
- ; BX lr
# Q9 A, a# C* E& \3 C m; C6 Z# h - ;3 D [- e* ~4 t0 I: r
- ; End of the file
, w% F: F$ ]) o6 [2 o6 }3 k. C1 { - ;
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- _stackptr:
& z7 q6 W& J: x$ `# j" U4 D7 x - .word __STACK_END( s! q/ {" I0 [. n
- _bss_start:
( }, m( e2 `$ q' O i% Q$ X - .word bss_start/ C. L: H Q7 z! D
- _bss_end:
2 Q$ ^/ H! \1 k$ m# N - .word bss_end
. {9 E! z- f7 P2 I: Q - _start_boot:
/ C3 l3 S3 z3 g1 x8 ? - .word start_boot# r( V9 W0 t% }2 q: N
- _data_auto_init:! I+ h x$ `( j0 J3 G1 o
- .word __TI_auto_init% \, b: }- o$ M# V0 v+ ^( ~! G6 R
- .end; ^0 C) a3 ]8 }# y3 ~% ^0 p5 k
-
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复制代码 2 Q' N7 a. |8 _/ d# G" R
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