| /* | |
| * This file is subject to the terms and conditions of the GNU General Public | |
| * License. See the file "COPYING" in the main directory of this archive | |
| * for more details. | |
| * | |
| * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved. | |
| */ | |
| /* | |
| * The xp_nofault_PIOR function takes a pointer to a remote PIO register | |
| * and attempts to load and consume a value from it. This function | |
| * will be registered as a nofault code block. In the event that the | |
| * PIO read fails, the MCA handler will force the error to look | |
| * corrected and vector to the xp_error_PIOR which will return an error. | |
| * | |
| * The definition of "consumption" and the time it takes for an MCA | |
| * to surface is processor implementation specific. This code | |
| * is sufficient on Itanium through the Montvale processor family. | |
| * It may need to be adjusted for future processor implementations. | |
| * | |
| * extern int xp_nofault_PIOR(void *remote_register); | |
| */ | |
| .global xp_nofault_PIOR | |
| xp_nofault_PIOR: | |
| mov r8=r0 // Stage a success return value | |
| ld8.acq r9=[r32];; // PIO Read the specified register | |
| adds r9=1,r9;; // Add to force consumption | |
| srlz.i;; // Allow time for MCA to surface | |
| br.ret.sptk.many b0;; // Return success | |
| .global xp_error_PIOR | |
| xp_error_PIOR: | |
| mov r8=1 // Return value of 1 | |
| br.ret.sptk.many b0;; // Return failure |