1 files changed, 17 insertions, 38 deletions

diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index 6c8e483ce9e4..0d2981120cd6 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -303,17 +303,6 @@ extern int (*console_blank_hook)(int);
 #include "apm.h"
 
 /*
- * Define to make all _set_limit calls use 64k limits.  The APM 1.1 BIOS is
- * supposed to provide limit information that it recognizes.  Many machines
- * do this correctly, but many others do not restrict themselves to their
- * claimed limit.  When this happens, they will cause a segmentation
- * violation in the kernel at boot time.  Most BIOS's, however, will
- * respect a 64k limit, so we use that.  If you want to be pedantic and
- * hold your BIOS to its claims, then undefine this.
- */
-#define APM_RELAX_SEGMENTS
-
-/*
  * Define to re-initialize the interrupt 0 timer to 100 Hz after a suspend.
  * This patched by Chad Miller <cmiller@surfsouth.com>, original code by
  * David Chen <chen@ctpa04.mit.edu>
@@ -2312,9 +2301,20 @@ static int __init apm_init(void)
         set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
         _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
 
+        /*
+         * Set up the long jump entry point to the APM BIOS, which is called
+         * from inline assembly.
+         */
         apm_bios_entry.offset = apm_info.bios.offset;
         apm_bios_entry.segment = APM_CS;
 
+        /*
+         * The APM 1.1 BIOS is supposed to provide limit information that it
+         * recognizes.  Many machines do this correctly, but many others do
+         * not restrict themselves to their claimed limit.  When this happens,
+         * they will cause a segmentation violation in the kernel at boot time.
+         * Most BIOS's, however, will respect a 64k limit, so we use that.
+         */
         for (i = 0; i < NR_CPUS; i++) {
                 struct desc_struct *gdt = get_cpu_gdt_table(i);
                 if (!gdt)
@@ -2325,33 +2325,12 @@ 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));
-#ifndef APM_RELAX_SEGMENTS
-                if (apm_info.bios.version == 0x100) {
-#endif
-                        /* 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);
-#ifndef APM_RELAX_SEGMENTS
-                } else {
-                        _set_limit((char *)&gdt[APM_CS >> 3],
-                                (apm_info.bios.cseg_len - 1) & 0xffff);
-                        _set_limit((char *)&gdt[APM_CS_16 >> 3],
-                                (apm_info.bios.cseg_16_len - 1) & 0xffff);
-                        _set_limit((char *)&gdt[APM_DS >> 3],
-                                (apm_info.bios.dseg_len - 1) & 0xffff);
-                      /* workaround for broken BIOSes */
-                        if (apm_info.bios.cseg_len <= apm_info.bios.offset)
-                                _set_limit((char *)&gdt[APM_CS >> 3], 64 * 1024 -1);
-                       if (apm_info.bios.dseg_len <= 0x40) { /* 0x40 * 4kB == 64kB */
-                                /* for the BIOS that assumes granularity = 1 */
-                                gdt[APM_DS >> 3].b |= 0x800000;
-                                printk(KERN_NOTICE "apm: we set the granularity of dseg.\n");
-                        }
-                }
-#endif
+                /* 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);