linux-kernel - [PATCH 0/4] x86: UV runtime bios calls

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Date:	Mon, 22 Sep 2008 16:06:44 -0500
From:	Russ Anderson <rja@....com>
To:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de
Cc:	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>,
	Russ Anderson <rja@....com>
Subject: [PATCH 0/4] x86: UV runtime bios calls

[PATCH 0/4] x86: UV runtime bios calls

Purpose: 
	Create an interface to allow calls into bios to return platform
	specific information.  The interface uses EFI SAL table entry.
	EFI provides a mechanism for defining function pointers to 
	firmware routines.  This patchset builds on the EFI mechanism
	to provide access to those firmware routines.

Patches:
	uv_efi_bios:	Look for SAL entry in EFI tables.

	uv_bios_common:	Add the EFI callback function using the EFI table
			entry.  Create associated wrapper code.  Initialize
			SAL system table entry info at boot time.

	uv_bios_call_partition: Add call to get partitioning related info.

	uv_sysfs:	Create sysfs entrys in /sys/firmware/sgi_uv/ for
			partitioning related information.

Implementation comments:

	This patch uses sal_systab.  sal_systab is used on ia64, but was
	not used on x86.  An alternative would be to create a new
	EFI entry type (uv_systab), though that would require adding 
	to struct efi.

	The location in sysfs (/sys/firmware/sgi_uv/) is based on
	community feedback.

	If EFI is not configured (CONFIG_EFI), the calls will return -ENOSYS.
	If run on a system with a bios that does not supportes EFI SAL, the
	calls will return -ENOSYS.

	Paul Jackson assisted in the development of this code.
	
-- 
Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc          rja@....com
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