vfpasm.s

ARM9基于WINDOWSCE的BSP源代码

;
;   The content of this file or document is CONFIDENTIAL and PROPRIETARY
;   to Jade Technologies Co., Ltd.  It is subjected to the terms of a
;   License Agreement between Licensee and Jade Technologies Co., Ltd.
;   restricting among other things, the use, reproduction, distribution
;   and transfer.  Each of the embodiments, including this information 
;   and any derivative work shall retain this copyright notice.
; 
;   Copyright (c) 2004 - 2005 Jade Technologies Co., Ltd. 
;   All rights reserved.
; ----------------------------------------------------------------
; File:     vfpasm.s,v
; Revision: 1.0
; ----------------------------------------------------------------
; $

;
; This source code is licensed under Microsoft Shared Source License
; Version 1.0 for Windows CE.
; For a copy of the license visit http://go.microsoft.com/fwlink/?LinkId=3223.
;
    OPT     2       ; disable listing
    INCLUDE kxarm.h
    INCLUDE armmacros.inc
    OPT     1       ; reenable listing

;
; nMaxRegs gives the number of OS allocated space for control registers.
; currently it's defined to be 8. If we ever need more than that, we'll 
; need to allocate space ourselves to save extra registers.
;
; OS will save/restore the standard VFP5TE control registers (fpexc, and fpscr)
; and will call into OAL to save/restore other implementation defined registers.
; For VFP10, the only register needs to be saved is FPINST
;

FPINST_REG  EQU    0


;----------------------------------------------------------------
; BOOL CPUHasVFP (void);
; ** NOTE: This is a place holder function, VFP is not supported
;           in this BSP
;----------------------------------------------------------------
    NESTED_ENTRY CPUHasVFP
    PROLOG_END

    mov     r0, #0

    RETURN
    ENTRY_END CPUHasVFP

;----------------------------------------------------------------
; void EnableVFP (void);
; ** NOTE: This is a place holder function, VFP is not supported
;           in this BSP
;----------------------------------------------------------------
    NESTED_ENTRY EnableVFP
    PROLOG_END

    RETURN
    ENTRY_END CPUHasVFP

;----------------------------------------------------------------
; void VFP10SaveCtrlRegs (LPDWORD lpExtra, int nMaxRegs);
;----------------------------------------------------------------
    LEAF_ENTRY VFP10SaveCtrlRegs
    DCD 0xeef92a10                  ; fmrx    r2, fpinst
    str     r2, [r0, #FPINST_REG]
    RETURN
    ENTRY_END VFP10SaveCtrlRegs

;----------------------------------------------------------------
; void VFP10RestoreCtrlRegs (LPDWORD lpExtra, int nMaxRegs);
;----------------------------------------------------------------
    LEAF_ENTRY VFP10RestoreCtrlRegs
    ldr     r2, [r0, #FPINST_REG]
    DCD 0xeee92a10                  ; fmxr    fpinst, r2
    RETURN
    ENTRY_END VFP10RestoreCtrlRegs


    END