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7019cc2dd6
Real-time code needs to know the number of cycles per second on SGI UV. The information is provided via a run time BIOS call. This patch provides the linux side of that interface. This is the first of several run time BIOS calls to be defined in uv/bios.h and bios_uv.c. Note that BIOS_CALL() is just a stub for now. The bios side is being worked on. Signed-off-by: Russ Anderson <rja@sgi.com> Cc: Jack Steiner <steiner@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/*
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* BIOS run time interface routines.
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*
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* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <asm/uv/bios.h>
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const char *
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x86_bios_strerror(long status)
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{
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const char *str;
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switch (status) {
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case 0: str = "Call completed without error"; break;
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case -1: str = "Not implemented"; break;
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case -2: str = "Invalid argument"; break;
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case -3: str = "Call completed with error"; break;
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default: str = "Unknown BIOS status code"; break;
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}
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return str;
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}
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long
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x86_bios_freq_base(unsigned long which, unsigned long *ticks_per_second,
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unsigned long *drift_info)
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{
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struct uv_bios_retval isrv;
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BIOS_CALL(isrv, BIOS_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
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*ticks_per_second = isrv.v0;
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*drift_info = isrv.v1;
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return isrv.status;
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}
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EXPORT_SYMBOL_GPL(x86_bios_freq_base);
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