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" J; G7 V) L5 x s# K& Y% z在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句- U0 G* ?) O5 D/ H
/* 重新配置程序入口点 */
) o8 ^- v6 b) _- K. ?8 A, l/ ?-e Entry- /****************************************************************************/3 B, [8 Z `0 [ c3 T7 J% ~" J
- /* */8 g d( C+ x! n5 X
- /* OMAPL138 及 DSP C6748 内存空间分配定义 *// l6 G# R: W0 e
- /* */
! x4 b' N* p! l$ M3 ] - /* 2015年04月20日 */0 R, p0 u" ?6 Z# S7 K
- /* */) p0 D$ p+ f& S0 Y3 I3 x. R% D, }
- /****************************************************************************/) g; ?: y; `% n; Z# ?4 n3 j2 i
- /* 堆栈 */+ p3 p' w* G2 Y/ l% R
- -stack 0x8000! j, S* u5 j6 w9 g; n2 w
- -heap 0x2000, v+ p4 k$ M! c" N+ R
- . L5 U2 H* {' }/ n
- /* 重新配置程序入口点 */- P+ m# R, [& S- y
- -e Entry
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0 a7 N2 {. x3 S2 m/ f% @! q _1 n- MEMORY+ |) _9 K) T5 F# W
- {) |5 S5 P& h* d3 G4 N0 [
- #ifdef DSP_CORE* n% Q" G& H* z( M" M4 ? G
- /****************************************************************************// b! [! x% j& |$ [# K% t) ^
- /* */
/ @9 t8 o% i) R6 m - /* DSP 专有内存区域 */3 \0 a+ e/ T! }4 O3 u X1 l
- /* */
. ]% L+ _4 Q* z - /****************************************************************************/
% ~. J* w1 c+ O5 F - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */' Y2 Q% x7 A0 u; b+ O
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */6 |! R f/ L& `" [7 Y. z7 h
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */0 D* Y2 U2 h$ ?$ o1 R1 e- j
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */; `( x: S4 z& F1 K6 v6 w
- #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.asm7 v) Z4 o* S4 d: a. b6 P
- ;******************************************************************************
/ w/ h- Z% l( C* z( K1 _ - ;
$ ^( Z( N5 k/ ^& x2 M) q - ; init.asm - Init code routines
- S7 ]2 t0 H( [9 d2 {3 ? - ;, q$ Y' @9 E/ c9 U. w3 N# w+ \; X
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/% f$ b! d% j& }9 X, }8 T- l! a3 D
- ; All rights reserved.& H( d8 ?' n: O1 |( C* j
- ;8 h8 Z$ H( E5 h$ [; [5 [/ Y: g; J0 \
- ;******************************************************************************/ L9 |) p9 f) l3 J
- ;****************************** Global Symbols*******************************
7 e% J0 S6 H: b7 d - .global Entry
+ M+ k! p8 `, o" j2 j - .global start_boot2 f3 @8 e z% }
- .global __TI_auto_init
& k" R; e( \, d/ v. w! u
& E9 C6 q; E# n+ c: R- .ref __stack/ \9 O. k/ L" y- h. f
- .ref __STACK_END
; i9 Z* H5 u( P' z; Z - .ref bss_start
+ Y. |# }* A/ z( H& c: w& l* R) f- e - .ref bss_end5 |3 T' e: g- J
- .ref start_boot* p; f0 W4 Q! J- `, x7 m% N& s2 q
- % s( J- R3 u, K0 \2 ]9 w
- ;************************ Internal Definitions ******************************; ~" }# L T$ v, T+ k
- ;
( q, a5 b3 N, z2 S) p+ n! ` - ; Define the stack sizes for different modes. The user/system mode will use
# r! U' ^' p% a9 r+ Q! U - ; the rest of the total stack size
7 f& v: g8 t) r - ;
4 X9 m4 G' ]+ K1 h - # a( d/ K$ R: Z1 o" D' S, b
- UND_STACK_SIZE .set 0x8
# v& s) o* X9 J. u - ABT_STACK_SIZE .set 0x86 ]. V% T1 ^$ o) m- u' }( q- I
- FIQ_STACK_SIZE .set 0x8* ?* k9 g" h4 e5 b$ I& Z+ e
- IRQ_STACK_SIZE .set 0x5003 M, O/ g' r/ V1 H* C
- SVC_STACK_SIZE .set 0x8
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- ; to set the mode bits in CPSR for different modes! _5 J# d) f4 z
- ;
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- MODE_USR .set 0x10: k( d. L$ _/ v, h# [: u
- MODE_FIQ .set 0x11% J0 ?+ r5 h- J" R. {
- MODE_IRQ .set 0x12
0 y! G3 U, t# S V+ p, N; a/ U! e - MODE_SVC .set 0x13
! v. _. N% t& ^! f - MODE_ABT .set 0x17
% B0 G8 {8 [4 N8 s) y, S - MODE_UND .set 0x1B
6 t7 {4 k- m% \3 E - MODE_SYS .set 0x1F
% d6 R7 {0 t$ \: P - # t- ^/ H# E( m+ O1 n1 c5 t/ W
- I_F_BIT .set 0xC0
, ]) _2 U% e1 {2 j' a d3 ~ - ( f: W" n& W' b; M
- ;**************************** Code Seection ***********************************
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- ; This code is assembled for ARM instructions6 f9 W) _- z1 k
- ;
! J* R2 ], d! H v8 d# v - .state32
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# \& P9 j; ~" ~& u1 \- ;******************************************************************************& O; a; `$ _% s( A6 p2 v8 H
- ;
( t% f8 [% | @: V' d7 K - ;******************************************************************************4 _6 k! ^5 d* M$ H( |& t% q% L
- ;3 k# Z+ A5 V5 t+ ]3 m
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and6 F: v* C/ r+ P0 p9 N: V
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the1 u. }, E) W) W$ Y
- ; main() function.
, Z, ~! G8 u5 ? - ;
0 g+ ^4 ?* ^1 R" Y! ~" _9 e - Entry:
0 g: C$ X9 r9 P* F( F0 q - ;
1 p4 t) y _& m) w$ |. o. j - ; Set up the Stack for Undefined mode
' E# I: B- x/ [( W4 `( N) i5 ?3 U - ;
. J+ Y+ P: G1 k3 J7 s: M - LDR r0, _stackptr ; Read and align the stack pointer- w0 v5 `& C5 G% m6 x! \# S
- SUB r0, r0, #81 G' V6 X; M+ ]/ H1 Z4 Z
- BIC r0, r0, #73 g+ ]2 a+ ] I+ o+ a/ I
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode* M9 Y* g# G' w8 F( d; Q4 Y0 Q$ z
- MOV sp,r0 ; write the stack pointer
" F" x6 a2 \8 X' d: h3 A! F1 J - SUB r0, r0, #UND_STACK_SIZE ; give stack space4 R M( N! V6 x) V5 U) ~
- ;1 O1 O1 t; w# \, p: h$ b4 R
- ; Set up the Stack for abort mode
* O$ A) p0 m( {, [& C9 D. D: o - ;
3 T. L0 q0 ~( r) b$ U - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
/ N& X7 a" T+ M# m ?" @. l - MOV sp, r0 ; write the stack pointer8 Y( y! J/ G) I' ]1 l
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space
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- ; Set up the Stack for FIQ mode
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- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
' O( ]; r1 E" N2 O; X- U/ p - MOV sp,r0 ; write the stack pointer; t8 x8 a5 J [# Y; p* p: w
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space# b* ?3 o+ N6 |+ j( [* v" K& r
- ;
- p# {7 W" E6 {6 f8 ~( a - ; Set up the Stack for IRQ mode
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- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
( z5 w+ L! v% @ - MOV sp,r0 ; write the stack pointer3 I' e, b0 T1 I
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
# _7 J. S9 W v0 t* k5 A8 |8 Y - ;
& [ r+ B; ^& W9 G6 K - ; Set up the Stack for SVC mode
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- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
5 L2 C. {+ m" B* y0 B - MOV sp,r0 ; write the stack pointer! |- U' m+ N4 w g
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space
* b H: ^4 x) I) @9 \ - ;) Y& ~5 `5 W: T3 R Q
- ; Set up the Stack for USer/System mode
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- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode+ R, |0 E2 w" `6 S$ ]7 T0 a3 W( R
- MOV sp,r0 ; write the stack pointer& r5 z( c1 H. [
- - t, ?( o ~( ~) B& Q
- ;
7 r7 |1 n. n$ n; G- E6 o - ; Clear the BSS section here
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- Clear_Bss_Section:3 `; ^* d" E# ?' W. e
- + ]5 W$ K' y6 ?$ I0 m9 E
- LDR r0, _bss_start ; Start address of BSS. ^( G- r1 S# H x
- LDR r1, _bss_end ; End address of BSS. ^" ?. Q$ K) g0 T8 R+ \
- SUB r1,r1,#4
9 ~0 M0 b. t; Z7 |6 O' e, i& j - MOV r2, #09 I6 E _" S- h# q8 I! a
- Loop:% Z+ H" Y6 k; |4 P Y1 h
- STR r2, [r0], #4 ; Clear one word in BSS, Q# o: C9 V: {1 g) q
- CMP r0, r18 l! l# x9 y3 m
- BLE Loop ; Clear till BSS end6 k& ]8 @7 ^/ Y/ N1 t+ B
' R/ Z j+ w* u) T% f; ~* D& S/ h- BL __TI_auto_init ; Call TI auto init/ A* ]' e( d- s; C& i
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- ; Enter the start_boot function. The execution still happens in system mode
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- LDR r10, _start_boot ; Get the address of start_boot
2 H- g- R0 e2 I( P$ H3 ~3 W5 z% Q - MOV lr,pc ; Dummy return
0 H, s0 e" {; o/ {3 d' V - BX r10 ; Branch to start_boot
; w. N. `& ~' \! z/ M - SUB pc, pc, #0x08 ; looping
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* @1 o1 N0 R3 v! R/ \9 ~* @' h$ f- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
/ ~* S6 l% h0 x5 t+ ?5 r4 \ - ; BX lr
& ?6 j" y r P6 D) d+ r) R - ;; [5 B! Q/ R1 M: n! a; j
- ; End of the file
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- _stackptr:* Q$ V' x+ O k0 ^
- .word __STACK_END
) ~; J: O5 h, U7 n- ~, e - _bss_start:
( I1 @. Q2 E/ g* A - .word bss_start
( w2 p: S# d0 L) F y - _bss_end:
$ P% ?4 X3 p+ s+ D - .word bss_end
0 ^- b6 u' e% k& f# P - _start_boot:
' W) i2 N- W! C; c g& [3 N& z - .word start_boot
g# b* {, H3 F0 {% {1 m - _data_auto_init:
0 V& \1 N* |; _% w$ M# W - .word __TI_auto_init
- r0 Y+ m: @( u) W1 [3 p" `* n9 h - .end4 L( B; T Q- g' `4 S
- - c) X' S2 E, ^2 |
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复制代码
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