/*
|
* 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
|
