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& s7 L( t& O4 t$ m3 ~" Z在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句" s( _; x9 z, {) h& g( A. t
/* 重新配置程序入口点 */
9 A' F/ T4 t* l3 a-e Entry- /****************************************************************************/3 I9 u' h2 C4 S. x P C
- /* *// b5 v3 [+ p: i; J
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */2 ?+ B6 A. @5 o) u0 s
- /* */
5 I1 d1 S; n8 B - /* 2015年04月20日 */
" S1 I5 Z6 N( s - /* */9 n8 P2 f0 t: M. n7 f" \
- /****************************************************************************/
/ y' G- L$ i3 G% G/ e6 X2 m; \; H - /* 堆栈 */# e9 J% R) q- {8 W, v
- -stack 0x8000
* r6 ]6 a1 y# K! D2 L6 S; G - -heap 0x2000
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- /* 重新配置程序入口点 */
& p: t( \* Q" O( o; f5 Z, @- G - -e Entry$ M: H* R& y; [- [: c
& X8 m1 K7 H5 k# z: q0 ^- MEMORY
( [0 a* G! h* @ Q \ - {
+ m1 t% f4 K% X/ g7 x7 R8 z2 e - #ifdef DSP_CORE& a/ d r' e# U- K4 x2 W
- /****************************************************************************/! y5 P4 z0 v/ }
- /* */6 q. I. Y9 ~& Q: s$ q
- /* DSP 专有内存区域 */6 l% M& ~( r' D6 c6 s
- /* */" Z1 b1 j( p8 |: ]: w- V
- /****************************************************************************/
`, v7 }" l$ J$ p - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */& g2 w; e+ I8 |! f- A9 C" a( B* m" _
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */3 |, s. p; D) d8 y$ Q3 |; w
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */% G8 d1 i/ t) E( j: c5 L# w
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */! a) O& O" w- t; Y
- #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+ L6 ]' i' }5 p. y, {
- ;******************************************************************************
" \6 U8 r. f; \) H - ;+ s. y, ]0 G) S- \
- ; init.asm - Init code routines
: u. H6 W8 V5 r% s5 K# E - ;9 {5 N$ J' M% r* ^
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
6 E) }! I% A/ ?( V1 u2 ]4 I - ; All rights reserved.
. ~: h& {: \1 Q8 p9 }' P* X - ;
9 s$ i" W7 N$ R& O - ;******************************************************************************
% M) H; ^1 D4 g+ t( o$ N$ z - ;****************************** Global Symbols*******************************8 e. _) T$ r8 o X" t
- .global Entry
" a" P" `& V! X, E2 u - .global start_boot
8 g+ @- a! j6 s* l - .global __TI_auto_init& H, S; e7 m! G7 _# s2 Y
3 L/ m' |* _1 D0 ]- .ref __stack ^# H) w5 C8 l, P/ I: x
- .ref __STACK_END8 ]0 O7 t% u s: P+ P1 h, A
- .ref bss_start
; }( _' J& _3 I4 U' X - .ref bss_end* {$ O2 f8 Z3 h; E3 u
- .ref start_boot
6 D! K* _: ]8 a - 8 E0 z" e5 }3 t0 b1 c4 R
- ;************************ Internal Definitions ******************************& {& ?, r+ q# j1 D/ e r0 ^9 T
- ;1 b" T. F4 G" ^' w
- ; Define the stack sizes for different modes. The user/system mode will use
+ E7 v g* E3 [' \% q - ; the rest of the total stack size. y+ E( E9 D2 V1 @- S( P
- ;# u2 [$ r. A3 `& Y% t- j1 D: F
- 7 ~( Z* i5 {& h4 X f
- UND_STACK_SIZE .set 0x8
. V2 d" {, W% Q - ABT_STACK_SIZE .set 0x84 d$ V7 ]$ L, _6 s* T5 D e
- FIQ_STACK_SIZE .set 0x8
' p; E" H" r- _4 N) z - IRQ_STACK_SIZE .set 0x500
$ }% S% e8 }" h. {1 g* K+ f! a6 o - SVC_STACK_SIZE .set 0x8
3 m* [1 M3 ?" U, i' ?. h7 b
5 w( J4 U. {+ _: I ?/ S, g; g- S- ;
7 K2 f: G' r+ C7 H# q$ d - ; to set the mode bits in CPSR for different modes7 q: t! M% ]+ k2 v: [
- ;
* t5 }8 Q5 c k
1 u9 m: J. m) \' N% M2 c$ u9 w- c) G( Q- MODE_USR .set 0x10
5 H" `3 \4 C! Z; I& ? - MODE_FIQ .set 0x11- j% A/ W2 y& W4 }( w: b
- MODE_IRQ .set 0x12
- S9 c8 Q) k6 Q2 L; c - MODE_SVC .set 0x13
" j/ u5 m7 ?2 S' w. S! o G3 v - MODE_ABT .set 0x17
8 o* Z/ f( O9 ?- C - MODE_UND .set 0x1B
+ q1 r$ f0 `/ f( t - MODE_SYS .set 0x1F
6 j1 n/ z+ H2 Z# c+ y1 c8 N- m - % w$ B& I g' o
- I_F_BIT .set 0xC0
+ n' e7 T0 w/ H+ D! c( E3 k4 Y
$ ? Y& q( M1 ` }- ;**************************** Code Seection ***********************************: e; G5 ?/ |% y$ K; V
- .text% g1 @* A& G1 O/ o# U6 r) Q
- * }7 o" u1 U# |4 L
- ;
8 T/ q$ x- u! {3 H2 b0 w. N* X - ; This code is assembled for ARM instructions
5 {- k% A3 {/ W - ;. r z$ S5 j& E
- .state32
. A4 S/ _7 D* @7 k; Z* M8 Q - 2 G6 G3 U9 C3 g2 ~- M. w
- ;******************************************************************************
" n! `4 D' c2 x - ;: C4 r5 z1 `) t J& t1 z* t
- ;******************************************************************************
4 U1 q1 R7 z4 Y E# b - ;
4 T' E/ `$ c2 w( Q [6 | - ; The reset handler sets up the stack pointers for all the modes. The FIQ and
' j4 H. R- f# g' ^; z: w - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the. q4 S/ q7 I& U3 f7 }; k
- ; main() function., b) s p5 e9 u& r+ O8 n, F& v) H
- ;
$ P* t X, g+ R - Entry:! i- s3 ^0 O1 C2 |
- ;
& N# X5 ], v& s - ; Set up the Stack for Undefined mode. i8 X6 n! M& E+ a/ I0 n7 l7 [' `- i
- ;
. D% v& ~( w! k9 h7 W" F7 O - LDR r0, _stackptr ; Read and align the stack pointer0 o+ }; L& z% s' a
- SUB r0, r0, #8- {& T: U; p" U! {# X
- BIC r0, r0, #7% l9 z( o! s* e' v, I
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
( F3 H8 D: T4 w% O- W - MOV sp,r0 ; write the stack pointer9 A/ L; V' O1 C D6 f
- SUB r0, r0, #UND_STACK_SIZE ; give stack space
; J# V+ N. k6 ~3 Y - ;
" ]# S' T* Z5 l - ; Set up the Stack for abort mode N" S# [- j7 e$ |% j
- ;. ^/ L* {3 j$ q) S* f
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode6 o: Y6 C! P' e& b" O( a" D% Z- l
- MOV sp, r0 ; write the stack pointer
. L5 `/ n% B& | - SUB r0,r0, #ABT_STACK_SIZE ; give stack space2 G! V. ]# T; ?1 Q7 X
- ;
; ?9 X" D* V" J' h' z - ; Set up the Stack for FIQ mode
: ^9 k1 h2 m+ Q R$ C% u - ;
( F+ i2 T' `! _6 U9 _# a - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode& g0 E% x2 L- d
- MOV sp,r0 ; write the stack pointer
3 c$ l7 {3 [' Z! W) E0 @3 ` - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space8 v# t0 ?1 F3 B3 m, p0 t- A2 J0 D# q
- ;- B8 C9 l- z. m! G
- ; Set up the Stack for IRQ mode
$ x" D+ t3 K6 I1 I4 v5 O - ;
% _! \7 {, o% y$ [& V2 ^ - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode& x* _- @7 n2 n5 \1 H! o6 P. K
- MOV sp,r0 ; write the stack pointer
9 Q F/ d8 b" P" a% N9 d - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space4 I$ J7 U- l L5 o8 c
- ;$ X, V H1 t c- ] R
- ; Set up the Stack for SVC mode
! R$ r, g1 b; w3 w/ n; M - ; R5 l! g" Q; e2 R
- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode# M( p; u( h1 Z8 ~8 Q
- MOV sp,r0 ; write the stack pointer
4 I S" v: R; K' q+ { - SUB r0,r0, #SVC_STACK_SIZE ; give stack space
3 W" ~/ L! g9 s6 v8 c - ;
$ W5 S% I, P; O" c6 H - ; Set up the Stack for USer/System mode0 f: z8 w5 v6 n- b1 i* j& K; g
- ;( E( L: f8 D- Y+ }
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode' k' G0 U+ `' y4 X: F
- MOV sp,r0 ; write the stack pointer
) e8 v5 ~' W! o$ C; F - 4 u1 J# O3 y6 @( N; G
- ;
- K" Q1 N. r) _1 a - ; Clear the BSS section here
+ w6 t) W0 F" ] \ - ;: i1 U) e( h9 x* {7 Y6 }1 K) U
- Clear_Bss_Section:
4 i3 ~1 E; R) r" n/ L" k - ( c3 x8 a* O" h+ _
- LDR r0, _bss_start ; Start address of BSS2 r3 r- V3 I9 T) k
- LDR r1, _bss_end ; End address of BSS
$ Z# n! o2 T& u8 s+ d( g2 d - SUB r1,r1,#4
4 F; @9 d/ Q( h - MOV r2, #0) {2 _! p3 r: U6 @4 ^
- Loop:
9 X; d7 Q) F) _& p( E" c/ I, c2 I - STR r2, [r0], #4 ; Clear one word in BSS8 z5 \( F, F3 d7 h6 f
- CMP r0, r1
b# \5 p- i: C - BLE Loop ; Clear till BSS end, _* T8 t3 i2 t: [5 j, \3 P4 M" u
- ; a/ |" g1 f& D2 f8 b9 I
- BL __TI_auto_init ; Call TI auto init
) x; S$ i$ F: t) W% F - . B X2 y0 @- F
- ;! r6 L. L" T0 H! @. o
- ; Enter the start_boot function. The execution still happens in system mode! W( p- S% U1 x y
- ;" f7 s9 N" |; b1 L6 `7 D
- LDR r10, _start_boot ; Get the address of start_boot4 B. L$ z3 ?% F' [
- MOV lr,pc ; Dummy return 6 q% ?: q% c7 l# h k# g
- BX r10 ; Branch to start_boot7 b7 w8 Q3 a) t5 Z
- SUB pc, pc, #0x08 ; looping
. y; Q, I* G+ j& G S. R - ) B# \; i8 h. q* l4 i9 |
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode3 s) s2 J7 J* p( U
- ; BX lr
% T& }1 ~0 i9 D/ f, S6 W' H, ]9 r. g - ;
+ l. J2 w$ D- C9 A - ; End of the file
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- s+ k0 W$ S6 v/ s/ S, H1 @' C
- _stackptr:
) k5 J( J3 `. L1 j( P - .word __STACK_END% b: f C2 D: j9 u
- _bss_start:$ E9 o' B9 Y2 S5 m# Y
- .word bss_start' _; n: i6 M, e8 L' Q
- _bss_end:8 e$ n1 ?; r$ {/ r% o2 t
- .word bss_end; l" G7 w2 n: l
- _start_boot:
. a8 _& _7 h5 q+ M+ L2 O- b - .word start_boot
' I3 h9 L" V# m2 r0 _# E$ K - _data_auto_init:
0 m# p) q7 \. _# _ - .word __TI_auto_init
+ X! K; }% ]: ]- Q( W - .end
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5 i. `9 `# ]; W9 s* n1 F& `2 o
复制代码 , Y/ w( v+ N+ p6 B2 b
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