2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (c) 2004-2007 Silicon Graphics, Inc. All Rights Reserved.
11 * The xp_nofault_PIOR function takes a pointer to a remote PIO register
12 * and attempts to load and consume a value from it. This function
13 * will be registered as a nofault code block. In the event that the
14 * PIO read fails, the MCA handler will force the error to look
15 * corrected and vector to the xp_error_PIOR which will return an error.
17 * The definition of "consumption" and the time it takes for an MCA
18 * to surface is processor implementation specific. This code
19 * is sufficient on Itanium through the Montvale processor family.
20 * It may need to be adjusted for future processor implementations.
22 * extern int xp_nofault_PIOR(void *remote_register);
25 .global xp_nofault_PIOR
27 mov r8=r0 // Stage a success return value
28 ld8.acq r9=[r32];; // PIO Read the specified register
29 adds r9=1,r9;; // Add to force consumption
30 srlz.i;; // Allow time for MCA to surface
31 br.ret.sptk.many b0;; // Return success
35 mov r8=1 // Return value of 1
36 br.ret.sptk.many b0;; // Return failure