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authorMike Waychison <mikew@google.com>2011-03-14 23:58:50 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-04-29 14:13:15 -0700
commitf548ccd47d608e88d432745091e13f927ced83f7 (patch)
treed5e93a47a4d7fddf6474b35b43c9ce275c97c0f5 /arch
parent57d5f9f808b7650a92f31e9cd3acd3f415a22530 (diff)
downloadop-kernel-dev-f548ccd47d608e88d432745091e13f927ced83f7.zip
op-kernel-dev-f548ccd47d608e88d432745091e13f927ced83f7.tar.gz
x86: Better comments for get_bios_ebda()
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/bios_ebda.h7
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 */
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