From: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Sat, 27 Jun 2009 13:36:37 +0000 (+0800)
Subject: MP table: Test 0xe0000 when searching MP float pointer structure
X-Git-Tag: v2.3.2~73^2~2
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/1df86978bda289b743b2fc978e82721462823b97

MP table: Test 0xe0000 when searching MP float pointer structure

MultiProcessor Specification version 1.4 never mentions this location,
however, some brain-dead BIOSes put MP table there ...  "Extened BIOS"
location is taken from mptable(8) in the base system.

Reported-and-Tested-by: ruse39 on EFnet #dragonflybsd
---

diff --git a/sys/platform/pc32/i386/mp_machdep.c b/sys/platform/pc32/i386/mp_machdep.c
index 3dd512a220..eba146fbff 100644
--- a/sys/platform/pc32/i386/mp_machdep.c
+++ b/sys/platform/pc32/i386/mp_machdep.c
@@ -71,6 +71,7 @@
 #define WARMBOOT_SEG		(KERNBASE + 0x0469)
 
 #define BIOS_BASE		(0xf0000)
+#define BIOS_BASE2		(0xe0000)
 #define BIOS_SIZE		(0x10000)
 #define BIOS_COUNT		(BIOS_SIZE/4)
 
@@ -391,6 +392,11 @@ mptable_search(void)
 	if ((x = mptable_search_sig(target, BIOS_COUNT)) > 0)
 		return x;
 
+	/* search the extended BIOS */
+	target = (u_int32_t)BIOS_BASE2;
+	if ((x = mptable_search_sig(target, BIOS_COUNT)) > 0)
+		return x;
+
 	/* nothing found */
 	return 0;
 }