Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 989 insertions, 0 deletions

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
new file mode 100644
index 00000000000..f4778747e88
--- /dev/null
+++ b/drivers/acpi/processor_core.c
@@ -0,0 +1,989 @@
+/*
+ * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2004       Dominik Brodowski <linux@brodo.de>
+ *  Copyright (C) 2004  Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
+ *  			- Added processor hotplug support
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *  TBD:
+ *	1. Make # power states dynamic.
+ *	2. Support duty_cycle values that span bit 4.
+ *	3. Optimize by having scheduler determine business instead of
+ *	   having us try to calculate it here.
+ *	4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/pm.h>
+#include <linux/cpufreq.h>
+#include <linux/cpu.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/dmi.h>
+#include <linux/moduleparam.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/cpu.h>
+#include <asm/delay.h>
+#include <asm/uaccess.h>
+#include <asm/processor.h>
+#include <asm/smp.h>
+#include <asm/acpi.h>
+
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/processor.h>
+
+
+#define ACPI_PROCESSOR_COMPONENT	0x01000000
+#define ACPI_PROCESSOR_CLASS		"processor"
+#define ACPI_PROCESSOR_DRIVER_NAME	"ACPI Processor Driver"
+#define ACPI_PROCESSOR_DEVICE_NAME	"Processor"
+#define ACPI_PROCESSOR_FILE_INFO	"info"
+#define ACPI_PROCESSOR_FILE_THROTTLING	"throttling"
+#define ACPI_PROCESSOR_FILE_LIMIT	"limit"
+#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
+#define ACPI_PROCESSOR_NOTIFY_POWER	0x81
+
+#define ACPI_PROCESSOR_LIMIT_USER	0
+#define ACPI_PROCESSOR_LIMIT_THERMAL	1
+
+#define ACPI_STA_PRESENT 0x00000001
+
+#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
+ACPI_MODULE_NAME		("acpi_processor")
+
+MODULE_AUTHOR("Paul Diefenbaugh");
+MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
+MODULE_LICENSE("GPL");
+
+
+static int acpi_processor_add (struct acpi_device *device);
+static int acpi_processor_start (struct acpi_device *device);
+static int acpi_processor_remove (struct acpi_device *device, int type);
+static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
+static void acpi_processor_notify ( acpi_handle	handle, u32 event, void *data);
+static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
+static int acpi_processor_handle_eject(struct acpi_processor *pr);
+
+static struct acpi_driver acpi_processor_driver = {
+	.name =		ACPI_PROCESSOR_DRIVER_NAME,
+	.class =	ACPI_PROCESSOR_CLASS,
+	.ids =		ACPI_PROCESSOR_HID,
+	.ops =		{
+				.add =		acpi_processor_add,
+				.remove =	acpi_processor_remove,
+				.start	= 	acpi_processor_start,
+			},
+};
+
+#define INSTALL_NOTIFY_HANDLER		1
+#define UNINSTALL_NOTIFY_HANDLER	2
+
+
+static struct file_operations acpi_processor_info_fops = {
+	.open 		= acpi_processor_info_open_fs,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+
+struct acpi_processor	*processors[NR_CPUS];
+struct acpi_processor_errata errata;
+
+
+/* --------------------------------------------------------------------------
+                                Errata Handling
+   -------------------------------------------------------------------------- */
+
+static int
+acpi_processor_errata_piix4 (
+	struct pci_dev		*dev)
+{
+	u8			rev = 0;
+	u8			value1 = 0;
+	u8			value2 = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
+
+	if (!dev)
+		return_VALUE(-EINVAL);
+
+	/*
+	 * Note that 'dev' references the PIIX4 ACPI Controller.
+	 */
+
+	pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
+
+	switch (rev) {
+	case 0:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
+		break;
+	case 1:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
+		break;
+	case 2:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
+		break;
+	case 3:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
+		break;
+	default:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
+		break;
+	}
+
+	switch (rev) {
+
+	case 0:		/* PIIX4 A-step */
+	case 1:		/* PIIX4 B-step */
+		/*
+		 * See specification changes #13 ("Manual Throttle Duty Cycle")
+		 * and #14 ("Enabling and Disabling Manual Throttle"), plus
+		 * erratum #5 ("STPCLK# Deassertion Time") from the January
+		 * 2002 PIIX4 specification update.  Applies to only older
+		 * PIIX4 models.
+		 */
+		errata.piix4.throttle = 1;
+
+	case 2:		/* PIIX4E */
+	case 3:		/* PIIX4M */
+		/*
+		 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
+		 * Livelock") from the January 2002 PIIX4 specification update.
+		 * Applies to all PIIX4 models.
+		 */
+
+		/*
+		 * BM-IDE
+		 * ------
+		 * Find the PIIX4 IDE Controller and get the Bus Master IDE
+		 * Status register address.  We'll use this later to read
+		 * each IDE controller's DMA status to make sure we catch all
+		 * DMA activity.
+		 */
+		dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
+		           PCI_DEVICE_ID_INTEL_82371AB,
+                           PCI_ANY_ID, PCI_ANY_ID, NULL);
+		if (dev) {
+			errata.piix4.bmisx = pci_resource_start(dev, 4);
+			pci_dev_put(dev);
+		}
+
+		/*
+		 * Type-F DMA
+		 * ----------
+		 * Find the PIIX4 ISA Controller and read the Motherboard
+		 * DMA controller's status to see if Type-F (Fast) DMA mode
+		 * is enabled (bit 7) on either channel.  Note that we'll
+		 * disable C3 support if this is enabled, as some legacy
+		 * devices won't operate well if fast DMA is disabled.
+		 */
+		dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
+			PCI_DEVICE_ID_INTEL_82371AB_0,
+			PCI_ANY_ID, PCI_ANY_ID, NULL);
+		if (dev) {
+			pci_read_config_byte(dev, 0x76, &value1);
+			pci_read_config_byte(dev, 0x77, &value2);
+			if ((value1 & 0x80) || (value2 & 0x80))
+				errata.piix4.fdma = 1;
+			pci_dev_put(dev);
+		}
+
+		break;
+	}
+
+	if (errata.piix4.bmisx)
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"Bus master activity detection (BM-IDE) erratum enabled\n"));
+	if (errata.piix4.fdma)
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"Type-F DMA livelock erratum (C3 disabled)\n"));
+
+	return_VALUE(0);
+}
+
+
+int
+acpi_processor_errata (
+	struct acpi_processor	*pr)
+{
+	int			result = 0;
+	struct pci_dev		*dev = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_errata");
+
+	if (!pr)
+		return_VALUE(-EINVAL);
+
+	/*
+	 * PIIX4
+	 */
+	dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
+		PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, PCI_ANY_ID, NULL);
+	if (dev) {
+		result = acpi_processor_errata_piix4(dev);
+		pci_dev_put(dev);
+	}
+
+	return_VALUE(result);
+}
+
+
+/* --------------------------------------------------------------------------
+                              FS Interface (/proc)
+   -------------------------------------------------------------------------- */
+
+static struct proc_dir_entry	*acpi_processor_dir = NULL;
+
+static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
+{
+	struct acpi_processor	*pr = (struct acpi_processor *)seq->private;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
+
+	if (!pr)
+		goto end;
+
+	seq_printf(seq, "processor id:            %d\n"
+			"acpi id:                 %d\n"
+			"bus mastering control:   %s\n"
+			"power management:        %s\n"
+			"throttling control:      %s\n"
+			"limit interface:         %s\n",
+			pr->id,
+			pr->acpi_id,
+			pr->flags.bm_control ? "yes" : "no",
+			pr->flags.power ? "yes" : "no",
+			pr->flags.throttling ? "yes" : "no",
+			pr->flags.limit ? "yes" : "no");
+
+end:
+	return_VALUE(0);
+}
+
+static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
+{
+	return single_open(file, acpi_processor_info_seq_show,
+						PDE(inode)->data);
+}
+
+
+static int
+acpi_processor_add_fs (
+	struct acpi_device	*device)
+{
+	struct proc_dir_entry	*entry = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
+
+	if (!acpi_device_dir(device)) {
+		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
+			acpi_processor_dir);
+		if (!acpi_device_dir(device))
+			return_VALUE(-ENODEV);
+	}
+	acpi_device_dir(device)->owner = THIS_MODULE;
+
+	/* 'info' [R] */
+	entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
+		S_IRUGO, acpi_device_dir(device));
+	if (!entry)
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Unable to create '%s' fs entry\n",
+			ACPI_PROCESSOR_FILE_INFO));
+	else {
+		entry->proc_fops = &acpi_processor_info_fops;
+		entry->data = acpi_driver_data(device);
+		entry->owner = THIS_MODULE;
+	}
+
+	/* 'throttling' [R/W] */
+	entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
+		S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
+	if (!entry)
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Unable to create '%s' fs entry\n",
+			ACPI_PROCESSOR_FILE_THROTTLING));
+	else {
+		entry->proc_fops = &acpi_processor_throttling_fops;
+		entry->proc_fops->write = acpi_processor_write_throttling;
+		entry->data = acpi_driver_data(device);
+		entry->owner = THIS_MODULE;
+	}
+
+	/* 'limit' [R/W] */
+	entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
+		S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
+	if (!entry)
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Unable to create '%s' fs entry\n",
+			ACPI_PROCESSOR_FILE_LIMIT));
+	else {
+		entry->proc_fops = &acpi_processor_limit_fops;
+		entry->proc_fops->write = acpi_processor_write_limit;
+		entry->data = acpi_driver_data(device);
+		entry->owner = THIS_MODULE;
+	}
+
+	return_VALUE(0);
+}
+
+
+static int
+acpi_processor_remove_fs (
+	struct acpi_device	*device)
+{
+	ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
+
+	if (acpi_device_dir(device)) {
+		remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,acpi_device_dir(device));
+		remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
+			acpi_device_dir(device));
+		remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,acpi_device_dir(device));
+		remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
+		acpi_device_dir(device) = NULL;
+	}
+
+	return_VALUE(0);
+}
+
+/* Use the acpiid in MADT to map cpus in case of SMP */
+#ifndef CONFIG_SMP
+#define convert_acpiid_to_cpu(acpi_id) (0xff)
+#else
+
+#ifdef CONFIG_IA64
+#define arch_acpiid_to_apicid 	ia64_acpiid_to_sapicid
+#define arch_cpu_to_apicid 	ia64_cpu_to_sapicid
+#define ARCH_BAD_APICID		(0xffff)
+#else
+#define arch_acpiid_to_apicid 	x86_acpiid_to_apicid
+#define arch_cpu_to_apicid 	x86_cpu_to_apicid
+#define ARCH_BAD_APICID		(0xff)
+#endif
+
+static u8 convert_acpiid_to_cpu(u8 acpi_id)
+{
+	u16 apic_id;
+	int i;
+
+	apic_id = arch_acpiid_to_apicid[acpi_id];
+	if (apic_id == ARCH_BAD_APICID)
+		return -1;
+
+	for (i = 0; i < NR_CPUS; i++) {
+		if (arch_cpu_to_apicid[i] == apic_id)
+			return i;
+	}
+	return -1;
+}
+#endif
+
+/* --------------------------------------------------------------------------
+                                 Driver Interface
+   -------------------------------------------------------------------------- */
+
+static int
+acpi_processor_get_info (
+	struct acpi_processor	*pr)
+{
+	acpi_status		status = 0;
+	union acpi_object	object = {0};
+	struct acpi_buffer	buffer = {sizeof(union acpi_object), &object};
+	u8			cpu_index;
+	static int		cpu0_initialized;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_get_info");
+
+	if (!pr)
+		return_VALUE(-EINVAL);
+
+	if (num_online_cpus() > 1)
+		errata.smp = TRUE;
+
+	acpi_processor_errata(pr);
+
+	/*
+	 * Check to see if we have bus mastering arbitration control.  This
+	 * is required for proper C3 usage (to maintain cache coherency).
+	 */
+	if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
+		pr->flags.bm_control = 1;
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"Bus mastering arbitration control present\n"));
+	}
+	else
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"No bus mastering arbitration control\n"));
+
+	/*
+	 * Evalute the processor object.  Note that it is common on SMP to
+	 * have the first (boot) processor with a valid PBLK address while
+	 * all others have a NULL address.
+	 */
+	status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Error evaluating processor object\n"));
+		return_VALUE(-ENODEV);
+	}
+
+	/*
+	 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
+	 *	>>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
+	 */
+	pr->acpi_id = object.processor.proc_id;
+
+	cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
+
+  	/* Handle UP system running SMP kernel, with no LAPIC in MADT */
+  	if ( !cpu0_initialized && (cpu_index == 0xff) &&
+  		       	(num_online_cpus() == 1)) {
+   		cpu_index = 0;
+   	}
+
+   	cpu0_initialized = 1;
+
+   	pr->id = cpu_index;
+
+  	/*
+  	 *  Extra Processor objects may be enumerated on MP systems with
+  	 *  less than the max # of CPUs. They should be ignored _iff
+  	 *  they are physically not present.
+  	 */
+   	if (cpu_index >=  NR_CPUS) {
+   		if (ACPI_FAILURE(acpi_processor_hotadd_init(pr->handle, &pr->id))) {
+   			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+   				"Error getting cpuindex for acpiid 0x%x\n",
+   				pr->acpi_id));
+   			return_VALUE(-ENODEV);
+   		}
+    	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
+		pr->acpi_id));
+
+	if (!object.processor.pblk_address)
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
+	else if (object.processor.pblk_length != 6)
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n",
+			object.processor.pblk_length));
+	else {
+		pr->throttling.address = object.processor.pblk_address;
+		pr->throttling.duty_offset = acpi_fadt.duty_offset;
+		pr->throttling.duty_width = acpi_fadt.duty_width;
+
+		pr->pblk = object.processor.pblk_address;
+
+		/*
+		 * We don't care about error returns - we just try to mark
+		 * these reserved so that nobody else is confused into thinking
+		 * that this region might be unused..
+		 *
+		 * (In particular, allocating the IO range for Cardbus)
+		 */
+		request_region(pr->throttling.address, 6, "ACPI CPU throttle");
+	}
+
+#ifdef CONFIG_CPU_FREQ
+	acpi_processor_ppc_has_changed(pr);
+#endif
+	acpi_processor_get_throttling_info(pr);
+	acpi_processor_get_limit_info(pr);
+
+	return_VALUE(0);
+}
+
+static int
+acpi_processor_start(
+	struct acpi_device	*device)
+{
+	int			result = 0;
+	acpi_status		status = AE_OK;
+	struct acpi_processor	*pr;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_start");
+
+	pr = acpi_driver_data(device);
+
+	result = acpi_processor_get_info(pr);
+	if (result) {
+		/* Processor is physically not present */
+		return_VALUE(0);
+	}
+
+	BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
+
+	processors[pr->id] = pr;
+
+	result = acpi_processor_add_fs(device);
+	if (result)
+		goto end;
+
+	status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
+		acpi_processor_notify, pr);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Error installing device notify handler\n"));
+	}
+
+	acpi_processor_power_init(pr, device);
+
+	if (pr->flags.throttling) {
+		printk(KERN_INFO PREFIX "%s [%s] (supports",
+			acpi_device_name(device), acpi_device_bid(device));
+		printk(" %d throttling states", pr->throttling.state_count);
+		printk(")\n");
+	}
+
+end:
+
+	return_VALUE(result);
+}
+
+
+
+static void
+acpi_processor_notify (
+	acpi_handle		handle,
+	u32			event,
+	void			*data)
+{
+	struct acpi_processor	*pr = (struct acpi_processor *) data;
+	struct acpi_device	*device = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_notify");
+
+	if (!pr)
+		return_VOID;
+
+	if (acpi_bus_get_device(pr->handle, &device))
+		return_VOID;
+
+	switch (event) {
+	case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
+		acpi_processor_ppc_has_changed(pr);
+		acpi_bus_generate_event(device, event,
+			pr->performance_platform_limit);
+		break;
+	case ACPI_PROCESSOR_NOTIFY_POWER:
+		acpi_processor_cst_has_changed(pr);
+		acpi_bus_generate_event(device, event, 0);
+		break;
+	default:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"Unsupported event [0x%x]\n", event));
+		break;
+	}
+
+	return_VOID;
+}
+
+
+static int
+acpi_processor_add (
+	struct acpi_device	*device)
+{
+	struct acpi_processor	*pr = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_add");
+
+	if (!device)
+		return_VALUE(-EINVAL);
+
+	pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
+	if (!pr)
+		return_VALUE(-ENOMEM);
+	memset(pr, 0, sizeof(struct acpi_processor));
+
+	pr->handle = device->handle;
+	strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
+	strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
+	acpi_driver_data(device) = pr;
+
+	return_VALUE(0);
+}
+
+
+static int
+acpi_processor_remove (
+	struct acpi_device	*device,
+	int			type)
+{
+	acpi_status		status = AE_OK;
+	struct acpi_processor	*pr = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_remove");
+
+	if (!device || !acpi_driver_data(device))
+		return_VALUE(-EINVAL);
+
+	pr = (struct acpi_processor *) acpi_driver_data(device);
+
+	if (pr->id >= NR_CPUS) {
+		kfree(pr);
+		return_VALUE(0);
+	}
+
+	if (type == ACPI_BUS_REMOVAL_EJECT) {
+		if (acpi_processor_handle_eject(pr))
+			return_VALUE(-EINVAL);
+	}
+
+	acpi_processor_power_exit(pr, device);
+
+	status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
+		acpi_processor_notify);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Error removing notify handler\n"));
+	}
+
+	acpi_processor_remove_fs(device);
+
+	processors[pr->id] = NULL;
+
+	kfree(pr);
+
+	return_VALUE(0);
+}
+
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+/****************************************************************************
+ * 	Acpi processor hotplug support 				       	    *
+ ****************************************************************************/
+
+static int is_processor_present(acpi_handle handle);
+
+static int
+is_processor_present(
+	acpi_handle handle)
+{
+	acpi_status 		status;
+	unsigned long		sta = 0;
+
+	ACPI_FUNCTION_TRACE("is_processor_present");
+
+	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+	if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Processor Device is not present\n"));
+		return_VALUE(0);
+	}
+	return_VALUE(1);
+}
+
+
+static
+int acpi_processor_device_add(
+	acpi_handle	handle,
+	struct acpi_device **device)
+{
+	acpi_handle		phandle;
+	struct acpi_device 	*pdev;
+	struct acpi_processor	*pr;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_device_add");
+
+	if (acpi_get_parent(handle, &phandle)) {
+		return_VALUE(-ENODEV);
+	}
+
+	if (acpi_bus_get_device(phandle, &pdev)) {
+		return_VALUE(-ENODEV);
+	}
+
+	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
+		return_VALUE(-ENODEV);
+	}
+
+	acpi_bus_scan(*device);
+
+	pr = acpi_driver_data(*device);
+	if (!pr)
+		return_VALUE(-ENODEV);
+
+	if ((pr->id >=0) && (pr->id < NR_CPUS)) {
+		kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE);
+	}
+	return_VALUE(0);
+}
+
+
+static void
+acpi_processor_hotplug_notify (
+	acpi_handle		handle,
+	u32			event,
+	void			*data)
+{
+	struct acpi_processor	*pr;
+	struct acpi_device	*device = NULL;
+	int result;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
+
+	switch (event) {
+	case ACPI_NOTIFY_BUS_CHECK:
+	case ACPI_NOTIFY_DEVICE_CHECK:
+		printk("Processor driver received %s event\n",
+			(event==ACPI_NOTIFY_BUS_CHECK)?
+			"ACPI_NOTIFY_BUS_CHECK":"ACPI_NOTIFY_DEVICE_CHECK");
+
+		if (!is_processor_present(handle))
+			break;
+
+		if (acpi_bus_get_device(handle, &device)) {
+			result = acpi_processor_device_add(handle, &device);
+			if (result)
+				ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+					"Unable to add the device\n"));
+			break;
+		}
+
+		pr = acpi_driver_data(device);
+		if (!pr) {
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+				"Driver data is NULL\n"));
+			break;
+		}
+
+		if (pr->id >= 0 && (pr->id < NR_CPUS)) {
+			kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
+			break;
+		}
+
+		result = acpi_processor_start(device);
+		if ((!result) && ((pr->id >=0) && (pr->id < NR_CPUS))) {
+			kobject_hotplug(&device->kobj, KOBJ_ONLINE);
+		} else {
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+				"Device [%s] failed to start\n",
+				acpi_device_bid(device)));
+		}
+	break;
+	case ACPI_NOTIFY_EJECT_REQUEST:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,"received ACPI_NOTIFY_EJECT_REQUEST\n"));
+
+		if (acpi_bus_get_device(handle, &device)) {
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Device don't exist, dropping EJECT\n"));
+			break;
+		}
+		pr = acpi_driver_data(device);
+		if (!pr) {
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Driver data is NULL, dropping EJECT\n"));
+			return_VOID;
+		}
+
+		if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
+			kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
+		break;
+	default:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"Unsupported event [0x%x]\n", event));
+		break;
+	}
+
+	return_VOID;
+}
+
+static acpi_status
+processor_walk_namespace_cb(acpi_handle handle,
+	u32 lvl,
+	void *context,
+	void **rv)
+{
+	acpi_status 			status;
+	int *action = context;
+	acpi_object_type	type = 0;
+
+	status = acpi_get_type(handle, &type);
+	if (ACPI_FAILURE(status))
+		return(AE_OK);
+
+	if (type != ACPI_TYPE_PROCESSOR)
+		return(AE_OK);
+
+	switch(*action) {
+	case INSTALL_NOTIFY_HANDLER:
+		acpi_install_notify_handler(handle,
+			ACPI_SYSTEM_NOTIFY,
+			acpi_processor_hotplug_notify,
+			NULL);
+		break;
+	case UNINSTALL_NOTIFY_HANDLER:
+		acpi_remove_notify_handler(handle,
+			ACPI_SYSTEM_NOTIFY,
+			acpi_processor_hotplug_notify);
+		break;
+	default:
+		break;
+	}
+
+	return(AE_OK);
+}
+
+
+static acpi_status
+acpi_processor_hotadd_init(
+	acpi_handle		handle,
+	int			*p_cpu)
+{
+	ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
+
+	if (!is_processor_present(handle)) {
+		return_VALUE(AE_ERROR);
+	}
+
+	if (acpi_map_lsapic(handle, p_cpu))
+		return_VALUE(AE_ERROR);
+
+	if (arch_register_cpu(*p_cpu)) {
+		acpi_unmap_lsapic(*p_cpu);
+		return_VALUE(AE_ERROR);
+	}
+
+	return_VALUE(AE_OK);
+}
+
+
+static int
+acpi_processor_handle_eject(struct acpi_processor *pr)
+{
+	if (cpu_online(pr->id)) {
+		return(-EINVAL);
+	}
+	arch_unregister_cpu(pr->id);
+	acpi_unmap_lsapic(pr->id);
+	return(0);
+}
+#else
+static acpi_status
+acpi_processor_hotadd_init(
+	acpi_handle		handle,
+	int			*p_cpu)
+{
+	return AE_ERROR;
+}
+static int
+acpi_processor_handle_eject(struct acpi_processor *pr)
+{
+	return(-EINVAL);
+}
+#endif
+
+
+static
+void acpi_processor_install_hotplug_notify(void)
+{
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+	int action = INSTALL_NOTIFY_HANDLER;
+	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
+				     ACPI_ROOT_OBJECT,
+				     ACPI_UINT32_MAX,
+				     processor_walk_namespace_cb,
+				     &action, NULL);
+#endif
+}
+
+
+static
+void acpi_processor_uninstall_hotplug_notify(void)
+{
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+	int action = UNINSTALL_NOTIFY_HANDLER;
+	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
+				     ACPI_ROOT_OBJECT,
+				     ACPI_UINT32_MAX,
+				     processor_walk_namespace_cb,
+				     &action, NULL);
+#endif
+}
+
+/*
+ * We keep the driver loaded even when ACPI is not running.
+ * This is needed for the powernow-k8 driver, that works even without
+ * ACPI, but needs symbols from this driver
+ */
+
+static int __init
+acpi_processor_init (void)
+{
+	int			result = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_init");
+
+	memset(&processors, 0, sizeof(processors));
+	memset(&errata, 0, sizeof(errata));
+
+	acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+	if (!acpi_processor_dir)
+		return_VALUE(0);
+	acpi_processor_dir->owner = THIS_MODULE;
+
+	result = acpi_bus_register_driver(&acpi_processor_driver);
+	if (result < 0) {
+		remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+		return_VALUE(0);
+	}
+
+	acpi_processor_install_hotplug_notify();
+
+	acpi_thermal_cpufreq_init();
+
+	acpi_processor_ppc_init();
+
+	return_VALUE(0);
+}
+
+
+static void __exit
+acpi_processor_exit (void)
+{
+	ACPI_FUNCTION_TRACE("acpi_processor_exit");
+
+	acpi_processor_ppc_exit();
+
+	acpi_thermal_cpufreq_exit();
+
+	acpi_processor_uninstall_hotplug_notify();
+
+	acpi_bus_unregister_driver(&acpi_processor_driver);
+
+	remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+
+	return_VOID;
+}
+
+
+module_init(acpi_processor_init);
+module_exit(acpi_processor_exit);
+
+EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
+
+MODULE_ALIAS("processor");