#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/pm_legacy.h>
+#include <linux/capability.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#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
static void (*original_pm_idle)(void);
-extern void default_idle(void);
-
/**
* apm_cpu_idle - cpu idling for APM capable Linux
*
static int apm_console_blank(int blank)
{
- int error;
- u_short state;
+ int error, i;
+ u_short state;
+ static const u_short dev[3] = { 0x100, 0x1FF, 0x101 };
state = blank ? APM_STATE_STANDBY : APM_STATE_READY;
- /* Blank the first display device */
- error = set_power_state(0x100, state);
- if ((error != APM_SUCCESS) && (error != APM_NO_ERROR)) {
- /* try to blank them all instead */
- error = set_power_state(0x1ff, state);
- if ((error != APM_SUCCESS) && (error != APM_NO_ERROR))
- /* try to blank device one instead */
- error = set_power_state(0x101, state);
+
+ for (i = 0; i < ARRAY_SIZE(dev); i++) {
+ error = set_power_state(dev[i], state);
+
+ if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
+ return 1;
+
+ if (error == APM_NOT_ENGAGED)
+ break;
}
- if ((error == APM_SUCCESS) || (error == APM_NO_ERROR))
- return 1;
+
if (error == APM_NOT_ENGAGED) {
static int tried;
int eng_error;
static int __init apm_init(void)
{
struct proc_dir_entry *apm_proc;
+ struct desc_struct *gdt;
int ret;
- int i;
dmi_check_system(apm_dmi_table);
apm_info.disabled = 1;
return -ENODEV;
}
+#ifdef CONFIG_PM_LEGACY
pm_active = 1;
+#endif
/*
* Set up a segment that references the real mode segment 0x40
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;
- for (i = 0; i < NR_CPUS; i++) {
- struct desc_struct *gdt = get_cpu_gdt_table(i);
- set_base(gdt[APM_CS >> 3],
- __va((unsigned long)apm_info.bios.cseg << 4));
- set_base(gdt[APM_CS_16 >> 3],
- __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
- }
+ /*
+ * 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.
+ *
+ * Note we only set APM segments on CPU zero, since we pin the APM
+ * code to that CPU.
+ */
+ gdt = get_cpu_gdt_table(0);
+ set_base(gdt[APM_CS >> 3],
+ __va((unsigned long)apm_info.bios.cseg << 4));
+ set_base(gdt[APM_CS_16 >> 3],
+ __va((unsigned long)apm_info.bios.cseg_16 << 4));
+ set_base(gdt[APM_DS >> 3],
+ __va((unsigned long)apm_info.bios.dseg << 4));
apm_proc = create_proc_info_entry("apm", 0, NULL, apm_get_info);
if (apm_proc)
exit_kapmd = 1;
while (kapmd_running)
schedule();
+#ifdef CONFIG_PM_LEGACY
pm_active = 0;
+#endif
}
module_init(apm_init);
git.openpandora.org / pandora-kernel.git / blobdiff