sugar/linux
1
0
Fork 0
Code Activity

x86 BIOS interface for RTC on SGI UV

Browse Source 
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>
This commit is contained in:
Russ Anderson
2008-07-09 15:27:19 -05:00
committed by Ingo Molnar
parent 5b664cb235
commit 7019cc2dd6
4 changed files with 140 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

68
include/asm-x86/uv/bios.h Normal file
View File

@@ -0,0 +1,68 @@
#ifndef _ASM_X86_BIOS_H
#define _ASM_X86_BIOS_H
/*
* BIOS layer definitions.
*
* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/rtc.h>
#define BIOS_FREQ_BASE 0x01000001
enum {
BIOS_FREQ_BASE_PLATFORM = 0,
BIOS_FREQ_BASE_INTERVAL_TIMER = 1,
BIOS_FREQ_BASE_REALTIME_CLOCK = 2
};
# define BIOS_CALL(result, a0, a1, a2, a3, a4, a5, a6, a7) \
do { \
/* XXX - the real call goes here */ \
result.status = BIOS_STATUS_UNIMPLEMENTED; \
isrv.v0 = 0; \
isrv.v1 = 0; \
} while (0)
enum {
BIOS_STATUS_SUCCESS = 0,
BIOS_STATUS_UNIMPLEMENTED = -1,
BIOS_STATUS_EINVAL = -2,
BIOS_STATUS_ERROR = -3
};
struct uv_bios_retval {
/*
* A zero status value indicates call completed without error.
* A negative status value indicates reason of call failure.
* A positive status value indicates success but an
* informational value should be printed (e.g., "reboot for
* change to take effect").
*/
s64 status;
u64 v0;
u64 v1;
u64 v2;
};
extern long
x86_bios_freq_base(unsigned long which, unsigned long *ticks_per_second,
unsigned long *drift_info);
extern const char *x86_bios_strerror(long status);
#endif /* _ASM_X86_BIOS_H */