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/*
* Platform dependent support for IO probing.
*
* Copyright (c) 2000-2002 Silicon Graphics, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan
*/
#include <asm/sn/sn_sal.h>
/**
* ia64_sn_probe_io_slot - test a memory location for readability
* @paddr: physical address to probe
* @size: number bytes to read (1,2,4,8)
* @data_ptr: address to store value read by probe (-1 returned if probe fails)
*
* This function will probe a physical address to determine if
* the address can be read. If reading the address causes a BUS
* error, an error is returned. If the probe succeeds, the contents
* of the memory location is returned.
*
* Return values:
* 0 - probe successful
* 1 - probe failed (generated MCA)
* 2 - Bad arg
* <0 - PAL error
*/
u64
ia64_sn_probe_io_slot(long paddr, long size, void *data_ptr)
{
struct ia64_sal_retval isrv;
SAL_CALL(isrv, SN_SAL_PROBE, paddr, size, 0, 0, 0, 0, 0);
if (data_ptr) {
switch (size) {
case 1:
*((u8*)data_ptr) = (u8)isrv.v0;
break;
case 2:
*((u16*)data_ptr) = (u16)isrv.v0;
break;
case 4:
*((u32*)data_ptr) = (u32)isrv.v0;
break;
case 8:
*((u64*)data_ptr) = (u64)isrv.v0;
break;
default:
isrv.status = 2;
}
}
return isrv.status;
}
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