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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 | * | |
45d9ca49 | 6 | * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved. |
b0d82bd5 DN |
7 | */ |
8 | ||
b0d82bd5 DN |
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 | * | |
2022c1f1 RA |
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 | * | |
b0d82bd5 DN |
21 | * extern int xp_nofault_PIOR(void *remote_register); |
22 | */ | |
23 | ||
24 | .global xp_nofault_PIOR | |
25 | xp_nofault_PIOR: | |
26 | mov r8=r0 // Stage a success return value | |
27 | ld8.acq r9=[r32];; // PIO Read the specified register | |
c0346379 | 28 | adds r9=1,r9;; // Add to force consumption |
2022c1f1 | 29 | srlz.i;; // Allow time for MCA to surface |
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30 | br.ret.sptk.many b0;; // Return success |
31 | ||
32 | .global xp_error_PIOR | |
33 | xp_error_PIOR: | |
34 | mov r8=1 // Return value of 1 | |
35 | br.ret.sptk.many b0;; // Return failure |