xllp_pm_sleepcontexta.s

Windows CE 6.0 BSP for VOIP sample phone. Intel PXA270 platform.

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; Copyright (c) Microsoft Corporation.  All rights reserved.
;
;
; Use of this sample source code is subject to the terms of the Microsoft
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; see the LICENSE.RTF on your install media or the root of your tools installation.
; THE SAMPLE SOURCE CODE IS PROVIDED "AS IS", WITH NO WARRANTIES OR INDEMNITIES.
;
;TEST_STUB_PWR_OFF EQU 1
;******************************************************************************
;
;  COPYRIGHT (C) 2002 Intel Corporation.
;
;  This software as well as the software described in it is furnished under 
;  license and may only be used or copied in accordance with the terms of the 
;  license. The information in this file is furnished for informational use 
;  only, is subject to change without notice, and should not be construed as 
;  a commitment by Intel Corporation. Intel Corporation assumes no 
;  responsibility or liability for any errors or inaccuracies that may appear 
;  in this document or any software that may be provided in association with 
;  this document.
; 
;  Except as permitted by such license, no part of this document may be 
;  reproduced, stored in a retrieval system, or transmitted in any form or by 
;  any means without the express written consent of Intel Corporation. 
;
;  FILENAME:       xllp_Pm_SleepContextA.s
;
;  PURPOSE:        Provides assembly level code to support context saving, 
;                  processor sleep and context restoration after sleep
;                  for the Bulverde/Mainstone processor/platform.
;                  
;
;  LAST MODIFIED:  8/27/02
;******************************************************************************
;
; The functions in this source code are called via a branch with link instruction.
;
; NOTES:
;
; These functions assume that the MMU is enabled, except for any which receive all addresses
; as parameters.
;
        INCLUDE  xlli_Bulverde_defs.inc                 ; Bulverde specific include file
        INCLUDE  xllp_Pm_SleepContext.inc               ; Definitions for this file
 
;
        AREA    |.text|, CODE, READONLY, ALIGN=5        ; Align =5 required for "ALIGN 32" to work
;
; Functions made public by this file:
;
        EXPORT XllpPmEnterSleep
        EXPORT XllpPmChecksumSleepDataVi
        EXPORT XllpPmRestoreAfterSleep                   ; Not called by name elsewhere.

;
; External functions required for this file:
;
        IMPORT XllpPmSleepCLevelProcessing
        IMPORT XllpPmWakeCLevelProcessing

;**************************************************************************************************
;
; XllpPmChecksumSleepDataVi
;
; Does not assume a stack or MMU enable/disable state.
; 
; Inputs: 
;       R0: Base address of area to checksum
;       R1: Number of 4-byte words in area
;       Assumes return address in link register
;
; Returns:
;       R0: Checksum
;
; Uses: R0, R1, R2, R3
;


XllpPmChecksumSleepDataVi  FUNCTION

    ; do Checksum on the buffer

    ldr     r2, =(0x5A72)                  ; Pick a non-zero seed.
XllpPmCheckSumSleepDataVi_Lab1
    ldr     r3, [r0], #4                   ; get value and increment pointer
    add     r2, r2,   r3
    mov     r2, r2,   ROR #31              ; Rotate left by one bit position
    subs    r1, r1,   #1                   ; Count down for entire buffer size
    bne     XllpPmCheckSumSleepDataVi_Lab1
    mov     r0, r2

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

    ENDFUNC

;; End of XllpPmChecksumSleepDataVi()
;**************************************************************************************************


;******************************************************************************
;
;
;       ********************
;       *                  * 
;       * XllpPmEnterSleep *
;       *                  *
;       ********************
;
;
; NOTES: Written for the Bulverde Processor on the Mainstone Development Platform.
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;     
;    XllpPmEnterSleep() is an assembly-coded function that:
;