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' J6 L; V, o. ~1 e i* h4 _在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句7 y) s7 U! j `3 L6 V" x. _, D
/* 重新配置程序入口点 */7 d7 P) _- R; C, ?
-e Entry- /****************************************************************************/5 m% N4 q4 P2 s
- /* */7 f6 l* K `" L) S8 [4 `
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */6 E- H- h8 d: X/ o5 ~
- /* */
: y3 U' i8 Q& K# ? _8 w - /* 2015年04月20日 */" X$ `. D1 M' P3 l
- /* */
3 Y! q* C" Q# V2 B; R, z- _# w - /****************************************************************************/. V9 k9 A; M6 Y# v! h
- /* 堆栈 */1 ^! ?: O5 R- _7 l: n9 ?' I
- -stack 0x80002 i! D/ |4 P2 L6 |0 Z
- -heap 0x2000
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- /* 重新配置程序入口点 */
2 I7 Y1 V t J4 i. U" q - -e Entry/ I( C* V- t w
- 2 _& D l* Y C/ m) X$ B2 P
- MEMORY
6 A4 |* M$ b' n; A0 z7 t S9 S - {
8 T' q& }; O" j) r3 C* Z: F - #ifdef DSP_CORE
: K( n+ H, T/ J/ b% E - /****************************************************************************/
* x7 s1 X9 G% V& t& r) j - /* */7 e- _8 A5 p! F* w' d- h5 M
- /* DSP 专有内存区域 */- F; |; c! c6 z5 Q% W6 j5 T
- /* */
3 _# D+ W' |; ` _4 l: P6 d - /****************************************************************************/& Y$ L6 W4 N+ p2 \4 ] `! T& N5 R
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
9 w' W) l6 @: u9 S; _ - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
) J1 Q+ K7 \8 V* U. X: b; t - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
q' i- I7 f6 W4 |: S - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */9 E H c7 p6 l& E. y4 W! P
- #endif
复制代码 这是一段汇编代码用于切换到特权模式' a+ G& }. O* y( x$ O ~
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OMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm5 T! v& t* W9 I$ B8 F7 D
- ;******************************************************************************/ E# @9 S1 m/ u+ t: Q
- ;
' r# j$ m& d7 A$ o - ; init.asm - Init code routines
9 b' R6 L( z+ }9 _' p" U( V5 K2 g/ V - ;
* l4 s9 R8 ?( c3 R - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/, _) c; M/ Q- x: _# |/ ^1 \
- ; All rights reserved.
& m5 ?$ d$ R& } - ;
# \$ J0 c# e( H( C. A0 V: |- R6 K - ;******************************************************************************& b9 S8 D- S+ w |
- ;****************************** Global Symbols*******************************
& n& h' F- I N) ` - .global Entry( w' A6 k s: b5 c/ n
- .global start_boot/ q" m- r- H( m& I; K( z" s! \
- .global __TI_auto_init
/ j7 ]5 Z+ A4 ?6 @$ M
. Q+ | @4 Q" S5 i. @- .ref __stack
: {4 o8 ]6 U _+ I - .ref __STACK_END
# ^& B# p# R! j- u - .ref bss_start( ^% i; _4 _( c
- .ref bss_end4 t3 I8 C- h0 }+ `1 b4 f, d: P
- .ref start_boot/ s, t; F, _8 y5 g6 e3 o
: _: ^6 C: ~6 Q6 |- ;************************ Internal Definitions ******************************3 g; E' A' t* I2 E
- ;
; m5 [; l$ I8 B5 x0 B) L - ; Define the stack sizes for different modes. The user/system mode will use
/ T- ]6 J3 V4 D4 q7 s - ; the rest of the total stack size
; W. s O |8 F" v+ q* S- Y2 u - ;2 i% A3 b2 w/ Y. J
9 g) u4 x6 t9 |- UND_STACK_SIZE .set 0x8
( J$ u4 A, ]* _' ^5 c# v - ABT_STACK_SIZE .set 0x8
" a+ ^6 M( L) {& M" P6 y - FIQ_STACK_SIZE .set 0x85 V3 f4 T& m1 F& d0 i, V" O
- IRQ_STACK_SIZE .set 0x500
; L) A, s0 E) U3 W - SVC_STACK_SIZE .set 0x8
3 B7 A' W) ~. P! s$ `( D6 `7 z7 n - * i$ M# A3 {, E& t, E, {
- ;0 m% e7 J8 n4 n' i+ X" J3 x
- ; to set the mode bits in CPSR for different modes. }4 E9 K7 }2 {7 q4 l' g
- ;
2 }6 g H* l! Y' \ - 5 ]8 Y" D. M; C$ H2 }+ T- t$ F, U+ {
- MODE_USR .set 0x10. V+ ]$ \6 @' B2 e9 L
- MODE_FIQ .set 0x118 I1 X+ A/ v9 ~0 Y
- MODE_IRQ .set 0x12
0 ]9 }9 c- K4 ^" p7 D9 }9 p - MODE_SVC .set 0x131 l3 ?% o o2 n1 u
- MODE_ABT .set 0x17* h# F. P/ P$ ^4 m2 S3 p+ F* u
- MODE_UND .set 0x1B
8 N, c0 ?, L- t. q6 D8 a1 S6 m - MODE_SYS .set 0x1F
. x: W- J: L$ D - ' t! |8 n( C, j x/ @0 A+ W# z
- I_F_BIT .set 0xC0
p' V8 z7 n! O' ^6 T; @ - , ~+ p ^ H& F! p6 K' L5 [
- ;**************************** Code Seection ***********************************
. p. W! G4 }( ^8 h S8 Y" i - .text: R+ R1 f& _ p/ X9 Z
- . f( a4 J3 m, J) z
- ;- C( ]( a2 g' l( @5 \
- ; This code is assembled for ARM instructions
Z( g) R8 H$ F2 r! C - ;
! c" x# u1 A3 f6 k9 k- O4 b - .state32$ J. s R! |4 _
- 2 }0 G. _9 j7 f6 r6 `$ F
- ;******************************************************************************) V' l% V( o# g, m4 e
- ;
) r3 ]6 G0 Q! t0 V9 ~' }1 O - ;******************************************************************************
* a0 E7 o1 H; j9 Q - ;
6 q/ @7 \1 ]4 F# \, J - ; The reset handler sets up the stack pointers for all the modes. The FIQ and
" u+ G0 h8 P" Q9 X, ~0 J - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the) x; t _) F$ B3 x5 G5 t2 k( K
- ; main() function.
1 F1 L' M; U) t0 K# F9 C/ `/ W' p, Q - ;! e# ?9 p; z# O t% i# ]6 Z+ B2 ~
- Entry:
; i- `. E" i, i$ Z8 R, P1 Y - ;& B( {2 [' m I. w; u; o2 I
- ; Set up the Stack for Undefined mode
, n+ F5 N, g h, I, Y& j6 V - ;4 [* ~4 E* l# k4 b8 W* K$ S
- LDR r0, _stackptr ; Read and align the stack pointer
" k8 N! c8 k- y3 O9 X/ l7 `) W0 E - SUB r0, r0, #8
% X: A: Z5 ~, s) i* b - BIC r0, r0, #7) {4 M3 c4 ]9 l; J6 u
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode ^' X# }$ c" m( S" |1 B
- MOV sp,r0 ; write the stack pointer% S) A6 b1 ^8 l0 L4 S4 l
- SUB r0, r0, #UND_STACK_SIZE ; give stack space( v3 C( p, l; O0 Z. t- y
- ;0 N, q" r" H9 @$ z8 W) Q
- ; Set up the Stack for abort mode/ E7 }" B! P- T! b0 @2 w" h
- ;
4 U, i5 Y' T# ^3 q7 L5 f( b - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode- q5 c+ u/ B8 }- s
- MOV sp, r0 ; write the stack pointer
$ ^. B" _3 Q% o - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
/ R P% G, Q. C B: O; |) a7 A+ o' z - ;
9 X! L/ ~" j5 s3 N6 i/ e - ; Set up the Stack for FIQ mode
% G) M- g( k: D: U! i4 P }, U - ;8 j/ P$ T1 W$ h) e0 U! w; ~
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
j) H8 h: n( t - MOV sp,r0 ; write the stack pointer. ~3 j2 p+ p# B) S6 } `
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space1 @! \- z2 |" Y" S+ V! i0 p
- ;
( ]' ?7 w! Q$ V8 ]5 S) H - ; Set up the Stack for IRQ mode6 U' x( h& a7 f2 P
- ;# X. D' Y4 T2 C2 O
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
8 o' Z# C4 ^, ]3 k; y$ V+ [ - MOV sp,r0 ; write the stack pointer5 x& M, t+ S. V" R. l
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space0 \' V7 z- _, M* C# N4 w
- ;
: M f4 X( }$ N - ; Set up the Stack for SVC mode
- M5 A! H2 a2 U) {6 u" |/ x/ T/ c - ;
1 j3 R3 P; x0 \- M; o, c - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
& {/ g L" p0 Z+ h z. z, v - MOV sp,r0 ; write the stack pointer, B1 q( \) i* _! I
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space
2 Z- y" R, e( u" ] - ;! u$ ~' i- ^( V& g+ E
- ; Set up the Stack for USer/System mode
\- j2 x% w2 H) I) s, A# `! ` N - ;3 h8 ]5 U( E+ u6 v2 ]
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
0 u3 r8 X0 |. P% m; n - MOV sp,r0 ; write the stack pointer8 [ R+ f8 J: C9 X4 Q2 D( C
- 9 \! c8 B2 j% M% j; T& l
- ;6 I) c5 x' t/ m* K/ N
- ; Clear the BSS section here
5 e1 Q' y7 g' e - ;
4 K; K3 |: l6 g# L. d) t - Clear_Bss_Section:) Q$ G, A; R7 r9 ]' ?# y
- ' `* E) j# U0 d( j3 D
- LDR r0, _bss_start ; Start address of BSS
; o$ k0 y( V2 Y) f7 ?+ D* @/ s" P - LDR r1, _bss_end ; End address of BSS/ k* \4 y9 M/ C) z( r
- SUB r1,r1,#4. l. q! d# h5 U# C
- MOV r2, #0
- C. S& N9 k8 R3 F& S - Loop:
/ h. T- `2 z, \/ i - STR r2, [r0], #4 ; Clear one word in BSS
! L8 B* m! C% J. @' @5 S. C - CMP r0, r1
* x) H P: n6 p# ^ - BLE Loop ; Clear till BSS end6 F( F, i8 \: w' D. t7 T( ~
- , L! Y5 e* u& I, G: w
- BL __TI_auto_init ; Call TI auto init
) f3 G3 l! `9 ]9 H8 G
1 A- D7 z9 \) s4 E; E- ;
- i _6 a/ K( J V# Y4 O7 y$ \ - ; Enter the start_boot function. The execution still happens in system mode& O" B6 v5 f/ ^- B E. E3 h
- ;* ?& @1 u7 k' d5 [/ f1 M
- LDR r10, _start_boot ; Get the address of start_boot% H5 I% ] e$ W" v0 T+ J6 S' m
- MOV lr,pc ; Dummy return 1 A4 b- {& o, ^% p: z% X; `6 ^! ?
- BX r10 ; Branch to start_boot$ M$ S% i( z/ L! d4 ?8 h
- SUB pc, pc, #0x08 ; looping
+ i3 w3 K0 C6 |1 [, ?- c - ( _5 W3 J7 g- h9 k, N$ l4 {( ]
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
$ l, n. b2 j7 X1 P4 k( `& o - ; BX lr7 B8 L5 J7 ~ L& U6 t1 r0 g
- ;$ v+ a! s) u/ z' b- J. Y; P
- ; End of the file
4 W; e- |' H3 C0 H& ?; ~1 { - ;) X6 Q1 |2 g% Z( {5 O
; L' g- Y4 T$ h- B5 q. O: S- _stackptr:5 K' T8 A: L+ J5 t& c
- .word __STACK_END/ O: M- P9 k: B0 {3 Q: N
- _bss_start:, c9 W5 D0 T) [; _7 v
- .word bss_start
% v% S8 }, Q2 D% w2 b. F$ L - _bss_end:
/ m: a* S! W* t, O Y3 ` - .word bss_end
$ a3 h4 e6 c4 @ T" `# x - _start_boot:
+ g' z" {9 T7 ~0 v - .word start_boot
8 A9 K, }) B% p+ B/ R - _data_auto_init:
4 `0 b6 y# B- B% O - .word __TI_auto_init" ]% Q2 c5 L4 `
- .end6 g% p i o5 W2 x
- 9 C" k: ?6 S; X! o* a
1 `, a( @9 G! @1 \( U( U* \" T* O
' K8 ~3 i5 g. o) @' x5 P
复制代码
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