piread.c
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/*====================================================================
* piread.c
*
* Copyright 1995, Silicon Graphics, Inc.
* All Rights Reserved.
*
* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,
* Inc.; the contents of this file may not be disclosed to third
* parties, copied or duplicated in any form, in whole or in part,
* without the prior written permission of Silicon Graphics, Inc.
*
* RESTRICTED RIGHTS LEGEND:
* Use, duplication or disclosure by the Government is subject to
* restrictions as set forth in subdivision (c)(1)(ii) of the Rights
* in Technical Data and Computer Software clause at DFARS
* 252.227-7013, and/or in similar or successor clauses in the FAR,
* DOD or NASA FAR Supplement. Unpublished - rights reserved under the
* Copyright Laws of the United States.
*====================================================================*/
/**************************************************************************
*
* $Revision: 1.1.1.2 $
* $Date: 2002/10/29 08:06:43 $
* $Source: /root/leakn64/depot/rf/sw/n64os20l/libultra/nintendo/pi/piread.c,v $
*
**************************************************************************/
#include "osint.h"
#include "piint.h"
#include "rcp.h"
/*
* Name: osPiReadIo
*
* Description:
* Perform a 32-bit programmed IO read from PI device address space with
* mutual exclusion support. This is a blocked IO operation.
*
* Globals Referenced:
* None
*/
s32
osPiReadIo(u32 devAddr, u32 *data)
{
register s32 ret;
#ifdef _DEBUG
/* Ensure that address is 32-bit aligned */
if (devAddr & 0x3) {
__osError(ERR_OSPIREADIO, 1, devAddr);
return(-1);
}
#endif
/* Block to get resource token */
__osPiGetAccess();
ret = __osPiRawReadIo(devAddr, data);
/* Return resource token */
__osPiRelAccess();
return(ret);
} /* osPiReadIo */