1/* 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 4 * for more details. 5 * 6 * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved. 7 */ 8 9/* 10 * The xp_nofault_PIOR function takes a pointer to a remote PIO register 11 * and attempts to load and consume a value from it. This function 12 * will be registered as a nofault code block. In the event that the 13 * PIO read fails, the MCA handler will force the error to look 14 * corrected and vector to the xp_error_PIOR which will return an error. 15 * 16 * The definition of "consumption" and the time it takes for an MCA 17 * to surface is processor implementation specific. This code 18 * is sufficient on Itanium through the Montvale processor family. 19 * It may need to be adjusted for future processor implementations. 20 * 21 * extern int xp_nofault_PIOR(void *remote_register); 22 */ 23 24 .global xp_nofault_PIOR 25xp_nofault_PIOR: 26 mov r8=r0 // Stage a success return value 27 ld8.acq r9=[r32];; // PIO Read the specified register 28 adds r9=1,r9;; // Add to force consumption 29 srlz.i;; // Allow time for MCA to surface 30 br.ret.sptk.many b0;; // Return success 31 32 .global xp_error_PIOR 33xp_error_PIOR: 34 mov r8=1 // Return value of 1 35 br.ret.sptk.many b0;; // Return failure 36