From: Mike Waychison <mikew@google.com>
To: Greg KH <greg@kroah.com>, Matt Domsch <Matt_Domsch@dell.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Duncan Laurie <dlaurie@google.com>,
Aaron Durbin <adurbin@google.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Tim Hockin <thockin@google.com>, San Mehat <san@google.com>
Subject: [PATCH v2 09/12] x86: Better comments for get_bios_ebda()
Date: Fri, 11 Mar 2011 17:43:42 -0800 [thread overview]
Message-ID: <20110312014342.6133.61993.stgit@mike.mtv.corp.google.com> (raw)
In-Reply-To: <20110312014254.6133.43079.stgit@mike.mtv.corp.google.com>
Make the comments a bit clearer for get_bios_ebda so that it actually
tells us what it is returning.
Signed-off-by: Mike Waychison <mikew@google.com>
---
arch/x86/include/asm/bios_ebda.h | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/bios_ebda.h b/arch/x86/include/asm/bios_ebda.h
index 5174cf0..aa6a317 100644
--- a/arch/x86/include/asm/bios_ebda.h
+++ b/arch/x86/include/asm/bios_ebda.h
@@ -4,11 +4,14 @@
#include <asm/io.h>
/*
- * there is a real-mode segmented pointer pointing to the
- * 4K EBDA area at 0x40E.
+ * Returns physical address of EBDA. Returns 0 if there is no EBDA.
*/
static inline unsigned int get_bios_ebda(void)
{
+ /*
+ * There is a real-mode segmented pointer pointing to the
+ * 4K EBDA area at 0x40E.
+ */
unsigned int address = *(unsigned short *)phys_to_virt(0x40E);
address <<= 4;
return address; /* 0 means none */
next prev parent reply other threads:[~2011-03-12 1:44 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-12 1:42 [PATCH v2 00/12] google firmware support Mike Waychison
2011-03-12 1:43 ` [PATCH v2 01/12] efivars: move efivars globals into struct efivars Mike Waychison
2011-03-12 1:43 ` [PATCH v2 02/12] efivars: Make efivars bin_attributes dynamic Mike Waychison
2011-03-12 1:43 ` [PATCH v2 03/12] efivars: parameterize efivars Mike Waychison
2011-03-12 1:43 ` [PATCH v2 04/12] efivars: Split out variable registration Mike Waychison
2011-03-12 1:43 ` [PATCH v2 05/12] efivars: Parameterize operations Mike Waychison
2011-03-12 1:43 ` [PATCH v2 06/12] efivars: Expose efivars functionality to external drivers Mike Waychison
2011-03-12 1:43 ` [PATCH v2 07/12] efivars: Add Documentation Mike Waychison
2011-03-12 1:43 ` [PATCH v2 08/12] x86: get_bios_ebda_length() Mike Waychison
2011-03-14 15:43 ` Greg KH
2011-03-12 1:43 ` Mike Waychison [this message]
2011-03-14 15:43 ` [PATCH v2 09/12] x86: Better comments for get_bios_ebda() Greg KH
2011-03-12 1:43 ` [PATCH v2 10/12] Introduce CONFIG_GOOGLE_FIRMWARE Mike Waychison
2011-03-14 15:45 ` Greg KH
2011-03-14 19:49 ` Mike Waychison
2011-03-14 19:59 ` Greg KH
2011-03-14 20:06 ` Mike Waychison
2011-03-12 1:43 ` [PATCH v2 11/12] driver: Google EFI SMI Mike Waychison
2011-03-14 15:47 ` Greg KH
2011-03-14 20:01 ` Mike Waychison
2011-03-14 20:13 ` Greg KH
2011-03-14 21:09 ` Mike Waychison
2011-03-14 23:05 ` Alan Cox
2011-03-12 1:43 ` [PATCH v2 12/12] driver: Google Memory Console Mike Waychison
2011-03-14 4:54 ` H. Peter Anvin
2011-03-14 4:58 ` Tim Hockin
2011-03-14 5:02 ` H. Peter Anvin
2011-03-14 9:22 ` Ingo Molnar
2011-03-14 14:01 ` Tim Hockin
2011-03-14 14:23 ` Ingo Molnar
2011-03-14 15:47 ` Greg KH
2011-03-14 20:03 ` Mike Waychison
2011-03-14 22:46 ` H. Peter Anvin
2011-03-12 3:54 ` [PATCH v2 00/12] google firmware support Matt Domsch
2011-03-14 15:42 ` Greg KH
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