startup.s

Lido PXA270平台开发板的最新BSP,包括源代码

;
; Copyright (c) Microsoft Corporation.  All rights reserved.
;
;
; Use of this source code is subject to the terms of the Microsoft end-user
; license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
; If you did not accept the terms of the EULA, you are not authorized to use
; this source code. For a copy of the EULA, please see the LICENSE.RTF on your
; install media.
;
;------------------------------------------------------------------------------
;
;   File:  startup.s
;
;   Kernel startup routine for the Emdoor XSBASE270_G board.
;
;------------------------------------------------------------------------------

    INCLUDE kxarm.h
    INCLUDE bulverde.inc
    INCLUDE XSBASE270_G.inc
    INCLUDE xlli_Bulverde_defs.inc

    IMPORT  KernelStart

    TEXTAREA
       
;------------------------------------------------------------------------
    
     
    ; Include memory configuration file with g_oalAddressTable
    ;
    INCLUDE oemaddrtab_cfg.inc
 
;-------------------------------------------------------------------------------
;
; OALStartUp: OEM OAL startup code.
;
; Inputs: None.
; 
; On return: N/A.
;
; Register used: r0
;
;-------------------------------------------------------------------------------
;
    ALIGN
    LEAF_ENTRY OALStartUp

    ; Compute the OEMAddressTable's physical address and 
    ; load it into r0. KernelStart expects r0 to contain
    ; the physical address of this table. The MMU isn't 
    ; turned on until well into KernelStart.  
    ;
    add     r0, pc, #g_oalAddressTable - (. + 8)
    mov     r11, r0
    b       KernelStart
    nop
    nop
    nop
    nop
    nop
    nop
    
STALL
    b       STALL               ; Spin forever.


;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------

    LTORG                           ; insert a literal pool here.

;
; TURN_ON_BTB - Enables the Branch Target Buffer
;
; Turn on the BTB via cp15.1[11] - Uses r0
;
;
    LEAF_ENTRY TURN_ON_BTB

    mcr p15, 0, r0, c7, c5, 0   ; flush the icache & BTB
    mrc p15, 0, r0, c1, c0, 0
    orr r0, r0, #0x800
    mcr p15, 0, r0, c1, c0, 0

  IF Interworking :LOR: Thumbing
    bx  lr
  ELSE
    mov  pc, lr          ; return
  ENDIF
   
        
    END 

;------------------------------------------------------------------------------