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% U' ]1 l# G; l在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
; q2 L& q. D4 `1 E/* 重新配置程序入口点 */7 V' d) i0 ]" t7 E- b) m: q
-e Entry- /****************************************************************************/
8 ~1 ]+ L) F$ D7 u; K - /* */+ V' R3 `7 c' ~. u" t
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */
, s# H3 F" a; R# f/ w) } - /* */) a2 E' C9 a" {$ r( F
- /* 2015年04月20日 */
8 t1 V$ j( v6 c9 [, T - /* */0 R2 {2 ~6 ]% P% J
- /****************************************************************************/3 V8 r) X2 a) f% @5 D1 Z4 j/ B% V
- /* 堆栈 */1 c, E0 D1 v7 \3 `. F
- -stack 0x8000
( F1 x4 r1 ?% k* U9 i B; L - -heap 0x2000! u; W; l) s, Q& }" ]' `
- 5 }7 h$ S# F* [, {3 F
- /* 重新配置程序入口点 */% R9 w2 g J% z, T) [$ r1 I x. W7 T
- -e Entry, a9 L O) \) d5 H# F
9 x. ~7 V+ ~, y5 t: d. h" u R2 j- MEMORY0 E, u3 y: h# P8 ?$ V# t0 q
- {
, n$ C3 Y: C2 s5 C - #ifdef DSP_CORE6 W: |# b8 Q0 ]( @6 Z K
- /****************************************************************************/& m$ m! t3 u3 O3 T& v8 Y' w
- /* */3 k6 I* m/ A! O7 E( m& O; T
- /* DSP 专有内存区域 */ x- d* o6 @8 r9 V% n2 Y+ B
- /* */6 Q! R0 ?7 L* f/ Q
- /****************************************************************************/9 Q; {8 L n8 B [( \' ]
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */# f5 k# P: z$ \' Y6 g2 O; y
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */' u6 b3 E" H) U) S8 [
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */2 c/ |& `9 ?2 R' P+ \
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
1 e2 Q- `% Y; R0 ^ - #endif
复制代码 这是一段汇编代码用于切换到特权模式$ C: \+ r* m$ s) H) g+ U
- B& @9 s( Y: TOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
9 R1 v9 X2 g9 y- ;******************************************************************************4 f3 ?+ R* ~3 N, l' o
- ;5 {/ J/ _" X/ S: \8 |7 Z" `
- ; init.asm - Init code routines
; }' o" r6 ^3 P. J" |' G8 w - ;7 E& y X; [4 ], n
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
; J. ~9 ^( u+ w6 E: k- ` N3 x - ; All rights reserved.
; o3 E' E, g! \0 t - ;# d( g8 y6 i& l" V. w2 Z
- ;******************************************************************************% z1 T; t3 K6 Q
- ;****************************** Global Symbols*******************************" K0 A: M2 m/ b6 P$ }. W: A
- .global Entry
8 ?- M7 B( z: i - .global start_boot+ R \- R g/ `6 h2 ?+ ]4 D% {2 e
- .global __TI_auto_init s8 O h. n7 u- V% d! r. E
7 ?8 i4 j, q. [) S+ g5 N- .ref __stack
3 X0 o. Y) n" f% ^5 A8 ~1 w* U - .ref __STACK_END
9 i! z1 k* x2 e$ E: g) k3 L/ F$ s - .ref bss_start
$ |% o4 H" O2 Q, v6 W( a3 j - .ref bss_end8 A! b# @. d8 W; N2 @
- .ref start_boot5 m" `/ M5 L0 v& l6 \
3 ]: ]- P, a5 q- ;************************ Internal Definitions ******************************
h, Y4 }6 d& I - ;
, c/ e q ?! t" P - ; Define the stack sizes for different modes. The user/system mode will use
( C$ A2 h2 q! b& X- o# H4 [ - ; the rest of the total stack size
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- ' C) c% J% ]$ D$ Z8 H+ i
- UND_STACK_SIZE .set 0x8' a4 ^! c/ G1 D1 L9 t
- ABT_STACK_SIZE .set 0x8
k6 R- V8 l! N. V3 }3 d$ g - FIQ_STACK_SIZE .set 0x8* r! C, o% b- n, C2 H# [6 {
- IRQ_STACK_SIZE .set 0x500
( F' z2 ?0 z6 w - SVC_STACK_SIZE .set 0x8
0 A+ k' j# ~; @( C - 7 F3 V; P. e9 l8 v+ d; b
- ;% ^# z8 C1 ^' Y
- ; to set the mode bits in CPSR for different modes
9 M* a7 Z d C% z# `/ [! a - ;
- w! @' _1 y9 J
& D4 ]' O4 J5 q" H6 J- MODE_USR .set 0x10
. V& B# p1 c+ H) Q/ Q - MODE_FIQ .set 0x11
* R$ i5 ?9 i V2 O4 K - MODE_IRQ .set 0x12
- H6 e# n C* m9 q5 y2 K: d - MODE_SVC .set 0x134 _$ g0 ^- D% j$ _- G# C% t
- MODE_ABT .set 0x17
$ D0 p5 S9 V0 X+ Z - MODE_UND .set 0x1B/ t1 i: P1 {4 ]0 T# r9 f: q% w
- MODE_SYS .set 0x1F0 A3 n6 y7 E, L3 F- h
% L) ~' V! ?! I7 H- I_F_BIT .set 0xC0
" e7 C8 H; i) T, N - & A$ _1 b9 \) Z7 K& G" z
- ;**************************** Code Seection ***********************************$ t6 H/ C" V" L5 X. y
- .text, Y, U( T, i5 D& K* y- i
- 8 h a: B9 S( E2 i. x
- ;, M" u7 O0 F, L' w/ {! N
- ; This code is assembled for ARM instructions
( A$ F) ]: n7 D M - ;
8 c' x. [ R& P; m - .state322 \, m: ]# a- K0 |& I
- & _: |9 F" |* ~# |' c
- ;******************************************************************************
$ m4 O; T) s, w- W2 Z - ;
$ R, |, v/ I1 r& C4 ^ - ;******************************************************************************! m7 b# D4 B% m$ |4 @" S! M: G
- ;
2 P/ l) W3 V4 j1 F( l8 n - ; The reset handler sets up the stack pointers for all the modes. The FIQ and9 P: v- y3 l- B8 \: q
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the# P# y4 ^3 c* v2 D5 o- o
- ; main() function.2 v- d5 x0 n* L: m1 V
- ;
+ E2 C0 j6 \- y" Q1 r0 C( F" w" R - Entry:$ R }- y# q; V" c) f8 C1 q& j
- ;5 Z& b5 }. ^" w b# m
- ; Set up the Stack for Undefined mode
) ?" d/ g% a% E) q, t% { - ;! ?; @$ R t/ S, W. @' H0 a
- LDR r0, _stackptr ; Read and align the stack pointer1 X$ `# J; B8 O
- SUB r0, r0, #8
- x% v' J& @ J6 G% X4 N - BIC r0, r0, #7
% w: p# M W+ H$ {% e0 I e2 D - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode3 p! \, C& l5 T- W/ o% U
- MOV sp,r0 ; write the stack pointer9 j ^3 z9 x, w1 ~: H9 A8 _, l
- SUB r0, r0, #UND_STACK_SIZE ; give stack space4 p" u& r1 {* K* B$ j) Z
- ;" T, v) R2 D# W. E D/ u' F. _& h
- ; Set up the Stack for abort mode
% ?! A" v' L+ e6 b - ;8 X* X9 `* t/ q/ d* T/ z
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
4 Z" n' ]. G8 @7 V! E9 j! [ - MOV sp, r0 ; write the stack pointer4 E" p! u9 t3 b% b& B( c
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space/ J$ C4 c; }: i
- ;" @# ^& A+ F T' G5 K5 Z
- ; Set up the Stack for FIQ mode( G, d% W. V8 Y- P# Y: R- R
- ;/ U. u: G# {1 D
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
; \# P# W& r- Y- g: |' |" C - MOV sp,r0 ; write the stack pointer4 _/ |3 ?6 V- I3 ~1 D7 w
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space$ m4 O; ~4 O2 F6 u
- ;6 a* R5 q3 O& F& o. I
- ; Set up the Stack for IRQ mode
6 g1 l/ [- L+ z6 s - ;& D2 Y8 l K( P0 `6 g
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
7 L' R; F: c$ q3 @5 j% p! [" G* S - MOV sp,r0 ; write the stack pointer
g# ]% h3 K" Y" E, E) n: @ - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space; u% {. j9 Z; G- b8 f; i. L6 o
- ;$ z4 A2 t5 L- r$ {! R8 l& S
- ; Set up the Stack for SVC mode
4 E- ^/ ?. |4 {) N4 [ - ;
u; h* c( ?+ N0 \0 y - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
9 T5 ^; n8 P( F1 N& e: I7 | - MOV sp,r0 ; write the stack pointer8 E9 v7 m" H! R7 |' P0 @) D
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space- B8 o6 T6 N' G- t
- ;
4 J! y. n1 F6 W' Z - ; Set up the Stack for USer/System mode
+ \: g; U* o: D' R6 m4 M" \$ |: c - ;
: d4 M9 z& X# `7 ]) Z! ]& ~ - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode, p! F5 [8 U- s& g) U- P
- MOV sp,r0 ; write the stack pointer
/ P9 E6 y" v0 ?
8 l/ k: | g; C; E- ;6 I2 W$ ]4 i1 Q
- ; Clear the BSS section here5 N5 Y. G" Z% T a% }
- ;, w; U, X4 K' ?0 T# M/ x5 f7 P" m
- Clear_Bss_Section:; r9 P5 k0 \- H1 s5 @4 _
8 b+ t3 F) [. B% A- LDR r0, _bss_start ; Start address of BSS
* I' ?' p2 B4 b) Q0 E - LDR r1, _bss_end ; End address of BSS; R( T/ g) [) c# I
- SUB r1,r1,#4
0 S$ v8 p3 A- p - MOV r2, #0
8 u* B$ r4 `$ }$ ^+ G) A - Loop:
: G, s! X6 y! ~$ H - STR r2, [r0], #4 ; Clear one word in BSS! p1 o1 C. d6 |0 l1 E8 `
- CMP r0, r1$ c2 y8 E# ~% ^, w
- BLE Loop ; Clear till BSS end
7 f8 T. Z0 ^% x2 T* X% } - " F3 g5 P- ?3 s. J1 v7 o
- BL __TI_auto_init ; Call TI auto init R: r7 o+ p* I* q1 d; H
- ' x A% ~9 y1 W' n
- ;5 n6 U! C9 T6 q# P; p1 h0 }7 u* H# Z
- ; Enter the start_boot function. The execution still happens in system mode7 C8 X& j/ [! M. \( a* ?( @8 ^
- ;/ K8 O) E3 u; ?" Q
- LDR r10, _start_boot ; Get the address of start_boot% c5 m( h" U3 j) f
- MOV lr,pc ; Dummy return . | D& F. m4 I% u& Q9 u
- BX r10 ; Branch to start_boot
3 m5 Y0 d7 M8 `! v - SUB pc, pc, #0x08 ; looping
8 K; Z2 n/ j5 R6 l - 5 l* J3 x0 N* o3 E. Q; k; c
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
7 F/ F8 c+ I& q1 O) y - ; BX lr$ q& [2 ~/ s c# B) M+ g& U! x9 K8 N
- ;
' M* a4 }7 L: B* w - ; End of the file- d9 h+ g# H. m1 t# L! o8 Q
- ;
6 [2 v/ Z* W% g& L - 5 c+ M5 Q0 ?: r4 M
- _stackptr:8 ^& a& _8 o, r. m) f7 k, B" r
- .word __STACK_END+ y, w2 g' m$ j
- _bss_start:5 |( A, u9 l, @- _- k7 v% x" }" V
- .word bss_start2 s! C- G n5 m6 [$ ^7 ^- u
- _bss_end:$ W6 k( Q2 i0 U9 o8 y! ^
- .word bss_end
! E9 ?+ }4 P" c7 G2 I/ k4 K( q - _start_boot:
/ i. w% m! c) O5 c5 O6 X - .word start_boot+ Q/ d" }* n ^* Q: Q3 X
- _data_auto_init:2 q* n3 _4 m8 W3 ?5 \" v. k
- .word __TI_auto_init
# ]% Q5 e; l1 y/ K" g) X6 a3 r* ` - .end
) W5 M/ F+ m# m- j' j+ c. }2 M - ) L5 V; p! n) c( o5 T5 O# C- d6 k
- 5 \ V$ }$ k' w8 H7 D& k0 z
7 t! J( _, }/ ?
复制代码
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