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 <[email protected]>
Index: linux-2.6.14-zach-work/arch/i386/kernel/head.S
===================================================================
--- linux-2.6.14-zach-work.orig/arch/i386/kernel/head.S 2005-11-04 15:46:11.000000000 -0800
+++ linux-2.6.14-zach-work/arch/i386/kernel/head.S 2005-11-05 00:28:13.000000000 -0800
@@ -510,13 +510,14 @@ ENTRY(cpu_gdt_table)
.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-zach-work/arch/i386/kernel/apm.c
===================================================================
--- linux-2.6.14-zach-work.orig/arch/i386/kernel/apm.c 2005-11-04 15:46:50.000000000 -0800
+++ linux-2.6.14-zach-work/arch/i386/kernel/apm.c 2005-11-05 00:28:13.000000000 -0800
@@ -2305,12 +2305,6 @@ static int __init apm_init(void)
__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);