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0 Q- p0 ^, W* ?' b/ P在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句% _1 ]$ Q5 O6 d( W i, }. i
/* 重新配置程序入口点 */
3 L) X, |% t0 p, @3 ?; z1 {-e Entry- /****************************************************************************/
) n$ t1 R! b- ~4 @9 D, k3 r- l: `. C - /* */: u2 y: S( [9 E! [8 s$ V9 ~$ O/ l+ F
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */
# L" ]0 ~: r6 u3 _* Y2 D$ b$ m - /* */
) V6 @0 b( Z; f$ b4 z: u - /* 2015年04月20日 */$ h3 d7 g' V( c7 P
- /* */+ V! U' k' U) B% R2 a
- /****************************************************************************/
: o c2 _# o- y' O, { - /* 堆栈 */
1 Z- s3 P8 `+ r, A, U2 O" A - -stack 0x8000
4 J, T! o) r- [0 h9 Q6 \# x - -heap 0x20001 w: p$ r" F7 \; m* f I- M
. y1 S9 n0 j; h- f$ r- /* 重新配置程序入口点 */* X# c9 S2 h. g/ M5 [7 T. o
- -e Entry1 h1 y( T9 V* P8 C6 K+ k$ f; s
8 u6 [ A2 w+ ` T- MEMORY
# N1 J: w: M( t- |- e - {- r4 Q. y! Z% T" a! `9 {
- #ifdef DSP_CORE
' _; g. F, [% ~2 V( @$ J0 @7 N - /****************************************************************************/
8 K4 K+ ?% C2 N _7 s - /* */
/ e/ n% n# Y8 S: i4 p - /* DSP 专有内存区域 */3 n1 X& a( x9 Z: t. t1 \# m* C
- /* */
8 H% [6 R) K: l5 P/ M - /****************************************************************************/! n t! f% p: k+ N
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */( I; D! `# p+ l6 J _
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */; x0 z* M$ s+ e4 X' l- e2 V& n( w
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */; Y; k r4 P+ m9 _+ L: X
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */% M1 i- s7 X/ C6 f; `0 m! n& i
- #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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' k3 i6 l" ~: u3 KOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm- l: T! m# y" Q: t3 m
- ;******************************************************************************
a0 F! x1 M* k F - ;. A7 o" ?, `( W
- ; init.asm - Init code routines! F; [: X( C p! n' L; ~1 H/ @4 n* k
- ;
' q- X7 p V0 O! K- [3 d - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/1 l; a; G7 g3 u0 N
- ; All rights reserved.6 `* }3 P3 v, M& M% n
- ;
0 _ A8 R* m3 [, o4 J - ;******************************************************************************
! R: H: i3 D2 ^$ y: _; r - ;****************************** Global Symbols*******************************- y ^+ o8 K5 Z8 [, p9 D O
- .global Entry
8 X; L; _& q8 d8 Q7 @6 K - .global start_boot8 f2 k% A' L& i- p' {, g
- .global __TI_auto_init
& b2 F1 p, ~% x: P7 k2 d - - {" X# f6 Z4 K7 ] k- {4 f' I
- .ref __stack# g& y: ?, I& |& S* C2 C
- .ref __STACK_END
! {5 X+ ~$ z* b& r6 g7 \ - .ref bss_start
* `0 F6 r0 O$ x - .ref bss_end1 _. E2 a$ c& C4 `+ C6 Y, [
- .ref start_boot
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- ;************************ Internal Definitions ******************************
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- ; Define the stack sizes for different modes. The user/system mode will use
; d! ?! u9 v, u$ a' M. o8 Z - ; the rest of the total stack size, Y* W' h! q- j' M; l; Z1 {4 D) }
- ;9 D% @0 x6 _% l v0 N* i2 D
2 _* h+ f7 g+ x- UND_STACK_SIZE .set 0x8
. `, T% d @- E# q. i- L% V% F - ABT_STACK_SIZE .set 0x8
1 r+ s% K, y, ?8 G8 p$ ~ - FIQ_STACK_SIZE .set 0x8
+ Y, ]; H i& W& n - IRQ_STACK_SIZE .set 0x500
/ k. J0 E* Q; ^ ~ - SVC_STACK_SIZE .set 0x87 U- i3 h1 a2 X8 i
- 1 [) Q/ p# T! G/ c% a% O' ~
- ;' j! v( J$ g& J! H! N
- ; to set the mode bits in CPSR for different modes( d" e8 T0 M5 O9 K+ I" \3 J
- ;6 P, d; G- h/ ?4 U0 \
- 3 { L, B. M A, x- v
- MODE_USR .set 0x10: r) R/ |6 Z8 H
- MODE_FIQ .set 0x115 T- f' S7 Y$ U6 L8 i$ o
- MODE_IRQ .set 0x122 ~( w" u: ~( r
- MODE_SVC .set 0x137 u! b7 ~) s2 q Q5 }
- MODE_ABT .set 0x17 ?5 E5 y# o8 A- p
- MODE_UND .set 0x1B
. u7 F2 U- j- q* j+ ` - MODE_SYS .set 0x1F3 Z" o7 E0 L: Y3 f2 Q
- 1 T$ l K. |' s9 B
- I_F_BIT .set 0xC0
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- ;**************************** Code Seection ***********************************& t, ^; O$ t* _# L9 I3 x, ~
- .text! |3 p7 ~9 I, x1 F- R
2 T2 q7 W2 U; |# c3 G- ;
3 v( ?7 ^, n1 ~% v7 w* r8 s - ; This code is assembled for ARM instructions
- U" Z, t8 S) E2 y. p0 g: y8 P - ;
" r7 B$ t! Q2 O3 v5 c- H5 j - .state329 d! l1 [; i7 X' f0 t7 X" i3 J
/ w7 E* B* B$ B! T4 Q( r$ ^- ;******************************************************************************
3 ?$ d9 G; f: |7 l% ]% _ - ;' O5 P7 x7 Z; r$ x3 _; b$ d
- ;******************************************************************************/ { j' q! {2 h; c
- ;- |" n9 B: P8 ?* V# ]
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and
( Z* |: |- e' h- ^/ n - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
. l I2 g' B8 R9 W* H; | - ; main() function.
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- Entry:
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- ; Set up the Stack for Undefined mode
" ] E0 M2 [) g" B* V - ;
; q8 f) W; Y1 X' V# x: z9 ?4 V- m - LDR r0, _stackptr ; Read and align the stack pointer. G# n7 X# u& b; f6 @
- SUB r0, r0, #85 r* [% M2 h6 ^( s5 a/ S* e2 S
- BIC r0, r0, #7) d5 q- L. L$ y$ F3 J$ r- Q# P
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode: N4 @, e1 n# x+ i; X# l( ^
- MOV sp,r0 ; write the stack pointer- J, x7 f* d9 z. ^* X: O
- SUB r0, r0, #UND_STACK_SIZE ; give stack space+ A9 m3 Z3 c& L: D$ s5 u, l$ g
- ;8 s6 W& C# z$ m8 @# \
- ; Set up the Stack for abort mode2 ?/ ]7 Y! g0 X. K) K9 Q" ?
- ;4 [5 r6 q% T2 s- B2 S+ I. p3 K+ H
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
/ q5 ^5 u7 W. ^% {; n, k - MOV sp, r0 ; write the stack pointer
$ H! @1 s0 z$ O* w; O: O5 D5 }, G n2 R - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
" w) M# j* E j, {: Y, t - ;
5 S5 U: \0 h# M2 j, S - ; Set up the Stack for FIQ mode) Z% D8 V7 D$ ~" n/ g+ ]6 E
- ;
7 E$ a3 U/ x# R$ K, w: U - MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
6 B; A' B! m# [" }9 g1 E - MOV sp,r0 ; write the stack pointer
6 \0 _. j3 R5 |$ y - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
+ Y& I0 e4 z/ u( S - ;0 D/ @$ k1 c4 T/ c! \5 H# n
- ; Set up the Stack for IRQ mode
6 H8 k. S$ e3 G0 ^. G - ;( _- [) K k/ H$ a6 F* e
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode# W% o+ ?0 X$ i+ c+ M* w; u& L
- MOV sp,r0 ; write the stack pointer
6 C. v; s* J7 R' D - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space- o( ]6 O! ]% k& [
- ;' `6 }$ Y2 f$ \% F
- ; Set up the Stack for SVC mode. l2 k' T+ O8 \0 S
- ;
O6 G5 C# g$ T: J9 a$ `$ V# {) w - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
; L8 \. |- _8 Y; W& _/ p, ~ - MOV sp,r0 ; write the stack pointer" @ ~" T1 Q' o% J* F* O* P3 Y' K
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space
6 K) R3 d% F1 [ - ;
1 Y, h1 g, S/ o4 I4 o - ; Set up the Stack for USer/System mode
% k% V2 \0 o, F: w1 R - ;5 } ]7 q X# ? I
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
9 `* S/ z$ d9 k- z+ P1 c0 p" P - MOV sp,r0 ; write the stack pointer8 ], O" g) c! k8 e) Q
9 G; F. {0 [: h4 X6 |- ;* V3 K; T! g) I5 T" \2 n
- ; Clear the BSS section here
8 [' a: c# P0 p/ ]$ u - ;3 n% n# R/ F$ ^ \" f
- Clear_Bss_Section:
% ]- a/ W' I A; w- z - ; F6 e# {3 r2 J2 \, \2 Y4 S# u
- LDR r0, _bss_start ; Start address of BSS
$ g7 b7 P8 ~" I" b! M2 x - LDR r1, _bss_end ; End address of BSS
0 }: G6 N. \9 \2 _3 c4 @! I - SUB r1,r1,#4
& S1 P: c* |+ `5 B - MOV r2, #0. H# r7 X. T9 |$ a% q8 ?
- Loop:
( l8 h E1 O. E. Q, E* s - STR r2, [r0], #4 ; Clear one word in BSS
6 U' i, g0 m c+ e - CMP r0, r1
* Q6 j8 s/ ]8 _+ g! ]0 j- D - BLE Loop ; Clear till BSS end
; K: @( v/ c! G t - * u& ^ |7 `4 Z# G+ G' D, e! E
- BL __TI_auto_init ; Call TI auto init( n! Y+ k0 Q9 Q' \. T
- , ~8 R: Y; g! l& u8 Y$ r
- ;" S8 A) X. s3 O* i& R
- ; Enter the start_boot function. The execution still happens in system mode0 ~* w' Z$ k4 h3 g
- ;
# u" ~0 Z% W9 j9 S$ o/ A7 n - LDR r10, _start_boot ; Get the address of start_boot
2 t8 A: z Y5 D# `' V! A+ n- _, D - MOV lr,pc ; Dummy return
/ ^& o, X1 y! Z( k3 l9 p& h - BX r10 ; Branch to start_boot
6 o) O( {$ f- t ]/ b9 \; J - SUB pc, pc, #0x08 ; looping- T3 h8 D6 t1 x$ k" T/ Y& g
# l; U) R3 ?8 C; z5 p- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode R0 `* t/ C5 X; ]7 T6 F0 @6 h
- ; BX lr, i. F; n0 R7 D O2 `7 h
- ;
+ Q& a$ ?/ _: B' M" _" g - ; End of the file
+ W3 e1 A/ n t1 c - ;
/ X0 U9 T2 q4 }
, O9 W; W8 `1 e5 w: U2 o$ T- _stackptr:
5 g! r' ]7 c- _6 H( k - .word __STACK_END$ A& g7 i) Z3 e, t
- _bss_start:
- a g2 K% |) U( b - .word bss_start
' I9 ]; c; x& R8 m ~% l - _bss_end:% R, V- z& C/ P- o: E
- .word bss_end+ `, S9 ^7 M; Y) e. W
- _start_boot:) T5 t# V# `$ B; x- k2 t
- .word start_boot3 b! q7 B0 s V& A
- _data_auto_init:
6 C: _/ f7 G9 M6 j5 s - .word __TI_auto_init
. V1 @$ j& `7 {' h3 v - .end! U1 d. y F5 G- [+ ]! a
-
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/ @9 M" {* G5 f3 q3 \
复制代码
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