From: Zachary Amsden <zach@vmware.com>
To: Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Pratap Subrahmanyam <pratap@vmware.com>,
Christopher Li <chrisl@vmware.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Ingo Molnar <mingo@elte.hu>, Zachary Amsden <zach@vmware.com>
Subject: [PATCH 4/10] Apm seg in gdt
Date: Wed, 9 Nov 2005 16:37:34 -0800 [thread overview]
Message-ID: <200511100037.jAA0bY4U027733@zach-dev.vmware.com> (raw)
Since APM BIOS segment limits are now fixed, set them in head.S GDT and
don't use the complicated _set_limit() macro expansion.
Signed-off-by: Zachary Amsden <zach@vmware.com>
Index: linux-2.6.14/arch/i386/kernel/head.S
===================================================================
--- linux-2.6.14.orig/arch/i386/kernel/head.S 2005-11-08 05:41:06.000000000 -0800
+++ linux-2.6.14/arch/i386/kernel/head.S 2005-11-08 05:41:19.000000000 -0800
@@ -510,13 +510,14 @@
.quad 0x0080920000000000 /* 0xa0 16-bit data */
.quad 0x0080920000000000 /* 0xa8 16-bit data */
.quad 0x0080920000000000 /* 0xb0 16-bit data */
+
/*
* The APM segments have byte granularity and their bases
- * and limits are set at run time.
+ * are set at run time. All have 64k limits.
*/
- .quad 0x00409a0000000000 /* 0xb8 APM CS code */
- .quad 0x00009a0000000000 /* 0xc0 APM CS 16 code (16 bit) */
- .quad 0x0040920000000000 /* 0xc8 APM DS data */
+ .quad 0x00409a000000ffff /* 0xb8 APM CS code */
+ .quad 0x00009a000000ffff /* 0xc0 APM CS 16 code (16 bit) */
+ .quad 0x004092000000ffff /* 0xc8 APM DS data */
.quad 0x0000920000000000 /* 0xd0 - ESPFIX 16-bit SS */
.quad 0x0000000000000000 /* 0xd8 - unused */
Index: linux-2.6.14/arch/i386/kernel/apm.c
===================================================================
--- linux-2.6.14.orig/arch/i386/kernel/apm.c 2005-11-08 05:41:14.000000000 -0800
+++ linux-2.6.14/arch/i386/kernel/apm.c 2005-11-08 05:41:19.000000000 -0800
@@ -2306,12 +2306,6 @@
__va((unsigned long)apm_info.bios.cseg_16 << 4));
set_base(gdt[APM_DS >> 3],
__va((unsigned long)apm_info.bios.dseg << 4));
- /* For ASUS motherboard, Award BIOS rev 110 (and others?) */
- _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 - 1);
- /* For some unknown machine. */
- _set_limit((char *)&gdt[APM_CS_16 >> 3], 64 * 1024 - 1);
- /* For the DEC Hinote Ultra CT475 (and others?) */
- _set_limit((char *)&gdt[APM_DS >> 3], 64 * 1024 - 1);
}
apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
reply other threads:[~2005-11-10 0:37 UTC|newest]
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