/* * Platform dependent support for IO probing. * * Copyright (C) 2000   Silicon Graphics * Copyright (C) 2000   Jack Steiner (steiner@sgi.com) */#include <asm/sn/sn_sal.h>/* * ia64_sn_probe_io_slot *	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. * *   Calling sequence: *		ia64_probe_io_slot(paddr, size, data_ptr) * *   Input: *	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) * *   Output: *	Status *		 0 - probe successful *		 1 - probe failed (generated MCA) *		 2 - Bad arg *		<0 - PAL error */u64ia64_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;}