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