|
4 l5 H) b) E) F8 n" A0 \% x
在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句; c2 @. r9 k2 x" o+ V k2 p. W
/* 重新配置程序入口点 */
( t2 s+ c' g" B# N-e Entry- /****************************************************************************/
. {+ C4 i, b) V, b - /* */
* i, s/ q! J/ S - /* OMAPL138 及 DSP C6748 内存空间分配定义 */
5 E% l3 [- u( z% ^ - /* */
4 b' R' B, V Z7 t# I. d: H. i* B( G. w - /* 2015年04月20日 */9 M! X! W( {/ m+ P9 m
- /* */
6 s7 F/ m7 Q+ V% G! ~+ V3 u. k( Z: m - /****************************************************************************/
5 _" I& V) c+ ?( x" R) V - /* 堆栈 */( k7 ^! s- V' B1 m
- -stack 0x8000
: L& X- A6 f: C. J$ a, W' N - -heap 0x2000
) }( A' T P# _# G0 k1 C$ n; ~1 G - Y; @4 [, Z% h2 n0 w
- /* 重新配置程序入口点 */. P3 n# B* { W: Y" v+ M0 |0 E
- -e Entry
1 f, G/ R+ u4 v3 M1 ?: r3 R - / e" t8 A A/ \ U, C
- MEMORY
9 g @+ Z! Y* |2 l7 W$ c9 Z U - {$ k# e. p1 R4 _( ~6 p
- #ifdef DSP_CORE; V4 B; |2 P2 X/ s8 j
- /****************************************************************************/
' ]* e& ^6 O& o0 e3 ^ - /* */
1 S9 E: _8 W- }5 f+ q - /* DSP 专有内存区域 */3 m+ h$ Y3 B6 @- s, N
- /* */) U! ]4 O8 d B; ?- O
- /****************************************************************************/; H, P2 F/ Y/ J6 t, `) {
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */0 q N6 ]; a0 c* D7 R
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
' ~/ a4 h& \3 c - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */# d- f( W1 N. x% h
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
0 ^ E+ |; o8 x - #endif
复制代码 这是一段汇编代码用于切换到特权模式. A) M7 d) F- g, U E" h
- y- B( P9 [- XOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm7 U8 p. ]$ \* s; B
- ;******************************************************************************6 M; t: y# k( y
- ;( d, K9 ^1 A9 v( r; Q
- ; init.asm - Init code routines, |5 v6 O7 l' r" \* F+ u$ |! @* h
- ;' I. Q$ s( Z" Q9 D
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
' j: O: M, e. X/ [ - ; All rights reserved.
# l% y$ a$ z, \ a$ L/ K) K - ;1 L4 S$ {7 o# c( S+ ?
- ;******************************************************************************+ V( ?/ U* M) r4 w3 o8 }# r
- ;****************************** Global Symbols*******************************; I; j1 g; ] g9 R# P- W! b/ |
- .global Entry6 i: y2 X l9 d# L" G8 F7 H
- .global start_boot& |, V7 ~) i& Q6 G" d. B
- .global __TI_auto_init0 C" a) N+ M) I, Z8 C
6 ~, R8 ?* Y3 q* ~- .ref __stack
. O/ p) L- x: V# W$ r - .ref __STACK_END, h, M4 `# u: {! z2 e* o" K7 Z% f% o
- .ref bss_start2 H1 Y* O& g i7 `( y- ^$ N
- .ref bss_end
2 [ h" x& }% }* I - .ref start_boot
( L% ^! L7 Q2 W+ {( V* n
* i+ W, w% Y9 ~' C- t) D% D/ i- ;************************ Internal Definitions ******************************! e) w* p0 L3 `3 {. F* v9 Y+ J
- ;
: G6 n4 r) j- b/ b - ; Define the stack sizes for different modes. The user/system mode will use5 q* c( X5 B% p m
- ; the rest of the total stack size# t# p p( ~+ z+ B g* ~3 O2 w5 }8 E
- ;
/ h z* x1 H3 ^8 ]& i( w
9 Z! A/ l/ d8 h2 W0 Q1 U- UND_STACK_SIZE .set 0x8
! X& h4 T4 ~! @$ k) g - ABT_STACK_SIZE .set 0x8/ D; m S0 \' F" C' _
- FIQ_STACK_SIZE .set 0x8
7 a+ ?) A5 ^: [4 U. J - IRQ_STACK_SIZE .set 0x500
7 w- B( r- r# B4 b9 A - SVC_STACK_SIZE .set 0x86 F9 s# x, A7 C- p
$ d. Y: i- N4 {0 {- ;# h) `) `1 z; C2 l, B5 O
- ; to set the mode bits in CPSR for different modes
6 y z% T0 m) Z+ c; B3 K - ; S& F- K: Y$ w- A
- " K- @, g% y% J9 ^. V
- MODE_USR .set 0x10( x3 O6 R; O% \2 m
- MODE_FIQ .set 0x11
2 X& c5 O1 _+ Y+ E% V& P - MODE_IRQ .set 0x12( t/ Y# o4 p) b0 z& `' T
- MODE_SVC .set 0x13
/ J3 [) Z" c4 H, x: w/ y8 k0 r - MODE_ABT .set 0x17
6 i& L; _: I! x" i - MODE_UND .set 0x1B
$ b: `& N2 ]- B% t - MODE_SYS .set 0x1F
1 L8 J# T6 b' E; q8 C6 j
0 F3 q' c( g+ Z- I_F_BIT .set 0xC0
/ f1 q: g/ D( H U3 d - / l9 u0 y% V0 Q4 @& g
- ;**************************** Code Seection ***********************************+ Z9 G0 W& y, h4 D! `# A9 H
- .text
& j' F' f2 Z; N0 \: l" V0 C
) z: L6 h& u) o. X2 D6 c0 i; _- ;) g$ X& O% a. {; B
- ; This code is assembled for ARM instructions
7 G# ~. C2 _$ [( Z - ;3 z5 K; ]6 M ?% x. M
- .state320 t/ X6 |0 G% c" l
; F( V9 x1 V5 ~7 J- ;******************************************************************************
) E# y c4 l8 w8 A" ^; R - ;
x7 p4 _$ H( O. g, ~+ j - ;******************************************************************************
/ c& J4 _) N$ B - ;
4 F+ A c& `* ~, Y - ; The reset handler sets up the stack pointers for all the modes. The FIQ and0 L8 _8 R( q, _) D5 b
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the3 U9 n1 n# j& R' a5 {' f
- ; main() function.
: p+ z: Z0 g, q8 L5 e4 h9 L - ;9 l1 i: b7 I; ~* |0 o+ o
- Entry:
* O2 j: c- V" y0 }( i5 b - ;8 ? t3 ~0 |, I v) @1 @% ]
- ; Set up the Stack for Undefined mode
# S; l$ @( \7 |7 q - ;/ R8 @! V6 C: |( J& ~' N
- LDR r0, _stackptr ; Read and align the stack pointer
& [. L( H$ |% ` S% A - SUB r0, r0, #8
& N$ I8 Q& @: @1 ?, N( \ - BIC r0, r0, #7% V0 ?! ^8 `3 T
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
- e7 i) [+ ^; s - MOV sp,r0 ; write the stack pointer
" p! z7 f6 C; a1 c: | - SUB r0, r0, #UND_STACK_SIZE ; give stack space
! u0 A4 k( |: p+ p - ;
* k5 b: r, b+ }5 @4 @: \8 h/ ?: l3 v - ; Set up the Stack for abort mode
9 }. L. l* U+ M; F k - ;
0 d# V: ]/ Y5 ]: Z - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode& l* K9 a& Y( a" x! z4 V, b
- MOV sp, r0 ; write the stack pointer
9 B" ]) H+ d- H+ h/ o - SUB r0,r0, #ABT_STACK_SIZE ; give stack space- J6 ?- X/ }6 u: S4 v% g
- ;; C/ v, @5 L% ^% b( G# w
- ; Set up the Stack for FIQ mode9 A0 a3 J! u: d3 d+ n
- ;+ r- A C' N& B9 r7 y/ G+ L
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
$ I. v' ]$ m2 D$ U2 ^6 L - MOV sp,r0 ; write the stack pointer' \, o& i# x8 ?
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
" M" o- _- v/ ^) z* k m) n - ;1 a$ |9 P& i4 R! p
- ; Set up the Stack for IRQ mode
7 Q% }+ v" n, n - ;' ~. o0 e: F3 C3 Z! p; d7 J/ F ~
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
; T0 i; p5 Y" [ f1 A8 O - MOV sp,r0 ; write the stack pointer
9 A* F% u" a0 Q k4 D g - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
! {, W. U. j4 x! L* q. D C; N - ;
# K" T1 L: _3 ~( y5 U. [8 i - ; Set up the Stack for SVC mode* }( U5 }8 k2 c8 l% Z* ^8 I
- ;
p; I7 V2 B, Y; S5 G6 ~; d) } - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode2 M2 M5 u% }1 t9 Y6 s0 a
- MOV sp,r0 ; write the stack pointer
" f3 j+ @. z& q; l( L0 J9 L - SUB r0,r0, #SVC_STACK_SIZE ; give stack space8 w7 K% r6 B5 m6 p6 V) s
- ;
0 `2 v! s; Q& ]# O z* K: f - ; Set up the Stack for USer/System mode
6 T7 o4 p4 V6 Y - ;
9 T! ^0 @% p6 s) c, l% U2 O - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode$ ?4 f( j s6 i3 c6 m: }
- MOV sp,r0 ; write the stack pointer& q% ?. T! d0 [
- + P S& J! ?1 U. S! G2 n- U8 N) l
- ; }7 T* e1 z9 @, p% A7 X
- ; Clear the BSS section here7 o8 I# Z9 T( C6 L! l: l
- ;5 r2 t, [, o8 }: ?8 j& U }! W( P
- Clear_Bss_Section:% J7 K+ W1 W) {5 d3 n) Y0 q2 ?3 r
- $ _! A8 ^3 N Y2 v" B `
- LDR r0, _bss_start ; Start address of BSS6 M: d$ R& v" g. v9 Y" R
- LDR r1, _bss_end ; End address of BSS$ n! _2 p8 O7 d1 _. }( S
- SUB r1,r1,#4
/ M, d/ v/ K1 Y: d& F - MOV r2, #0( s; v, {/ b, {" _8 g
- Loop:
1 M( A2 i; x% x' d - STR r2, [r0], #4 ; Clear one word in BSS3 x; G U6 O- e# F. q% G( J+ \( F
- CMP r0, r1" }7 o) a8 ~% k
- BLE Loop ; Clear till BSS end5 A% X- O' ^- P
- 8 _9 _0 y. f: P) x# W# v5 a, E
- BL __TI_auto_init ; Call TI auto init
1 J( D4 b* S5 ]; \$ {" a% h5 K
3 {$ q$ S* n# r6 G N! o" V# A2 Q- ;
4 J3 u$ V H- M' a$ \1 p. g - ; Enter the start_boot function. The execution still happens in system mode
" H9 `' B& `+ \) H - ;( b; P8 A/ L% O8 j5 K! T
- LDR r10, _start_boot ; Get the address of start_boot
4 N* D& D# b! n( Z' p6 K3 j: l - MOV lr,pc ; Dummy return
. g- m } M! g! @0 |. B - BX r10 ; Branch to start_boot2 e( }' a0 E6 K9 {8 O% F: T6 i
- SUB pc, pc, #0x08 ; looping
! C1 r! u* Q7 l6 Z- E - 9 T3 Z$ b/ i, C, h4 Y
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
; l6 q0 T; U- |! s* Y/ j5 i - ; BX lr
: J) W( d+ p* V% | - ;
$ A, w$ H# E+ [ - ; End of the file
0 }8 R/ C) J: Y) l1 w Z - ;2 |+ b1 `# M2 g: l
- . D ?& S9 h: L* r3 H
- _stackptr:
$ W) O: B$ ^, r: I, u8 t - .word __STACK_END
3 n0 i0 {+ [3 G2 q; T0 A& _. ]: G - _bss_start:
$ ]% ]; z5 E0 Y- _" v - .word bss_start c1 B2 ?$ O" F
- _bss_end:
8 i7 z7 e7 Z6 A. } u9 N - .word bss_end
! h( a1 z% o- C/ p! K6 q - _start_boot:
& T: y! @. e' m) O - .word start_boot% C" l9 {, U( Q/ g- {/ b. J
- _data_auto_init:
9 h& u( x7 @! N+ Z - .word __TI_auto_init6 [; b8 f* E: o+ q1 ^) a5 S
- .end3 D2 p$ K+ p9 K* L* `* \3 Q
- 7 l g3 {9 X/ @; s& B
' k- t- X$ v, |' t# R/ U7 j- ) w; o. z `$ n8 I
复制代码 ) e5 F7 D) v2 X4 f/ D% ~4 S
; _8 y/ p4 J9 j2 E7 g+ B) m
% \/ W& |1 a7 B( o
6 y( [" Z" {) s- y* O; A
0 V! E( v4 l6 L) C' v |
|