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Commit 433e63c6 authored by Mark Allyn's avatar Mark Allyn Committed by Greg Kroah-Hartman
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Staging: rar_register: fix checkpatch errors and debug program file 

Signed-off-by: default avatarMark Allyn <mark.a.allyn@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 9cedb392
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Showing with 445 additions and 283 deletions
drivers/staging/rar_register/rar_register.c
View file @ 433e63c6
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/kdev_t.h>
#include <linux/semaphore.h>
#include <linux/mm.h>
#include <linux/poll.h>
#include <linux/wait.h>
#include <linux/ioctl.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
#include <linux/pci.h>
#include <linux/firmware.h>
#include <linux/sched.h>
/*
* rar_register.c - An Intel Restricted Access Region register driver
*
* Copyright(c) 2009 Intel Corporation. All rights reserved.
*
* 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.
*
* -------------------------------------------------------------------
* 20091204 Mark Allyn <mark.a.allyn@intel.com>
* Ossama Othman <ossama.othman@intel.com>
* Cleanup per feedback from Alan Cox and Arjan Van De Ven
*
* 20090806 Ossama Othman <ossama.othman@intel.com>
* Return zero high address if upper 22 bits is zero.
* Cleaned up checkpatch errors.
* Clarified that driver is dealing with bus addresses.
*
* 20090702 Ossama Othman <ossama.othman@intel.com>
* Removed unnecessary include directives
* Cleaned up spinlocks.
* Cleaned up logging.
* Improved invalid parameter checks.
* Fixed and simplified RAR address retrieval and RAR locking
* code.
*
* 20090626 Mark Allyn <mark.a.allyn@intel.com>
* Initial publish
*/
#define DEBUG 1
#include "rar_register.h"
/* The following defines are for the IPC process to retrieve RAR in */
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/kernel.h>
/* === Lincroft Message Bus Interface === */
/* Message Control Register */
#define LNC_MCR_OFFSET 0xD0
/* Maximum number of clients (other drivers using this driver) */
#define MAX_RAR_CLIENTS 10
/* Message Data Register */
#define LNC_MDR_OFFSET 0xD4
/* Message Opcodes */
#define LNC_MESSAGE_READ_OPCODE 0xD0
#define LNC_MESSAGE_READ_OPCODE 0xD0
#define LNC_MESSAGE_WRITE_OPCODE 0xE0
/* Message Write Byte Enables */
......@@ -37,59 +71,73 @@
#define LNC_BUNIT_PORT 0x3
/* === Lincroft B-Unit Registers - Programmed by IA32 firmware === */
#define LNC_BRAR0L 0x10
#define LNC_BRAR0H 0x11
#define LNC_BRAR1L 0x12
#define LNC_BRAR1H 0x13
#define LNC_BRAR0L 0x10
#define LNC_BRAR0H 0x11
#define LNC_BRAR1L 0x12
#define LNC_BRAR1H 0x13
/* Reserved for SeP */
#define LNC_BRAR2L 0x14
#define LNC_BRAR2H 0x15
#define LNC_BRAR2L 0x14
#define LNC_BRAR2H 0x15
/* Moorestown supports three restricted access regions. */
#define MRST_NUM_RAR 3
/* This structure is only used during module initialization. */
struct RAR_offsets {
int low; /* Register offset for low RAR physical address. */
int high; /* Register offset for high RAR physical address. */
};
struct pci_dev *rar_dev;
static uint32_t registered;
/* RAR Bus Address Range */
struct RAR_address_range {
dma_addr_t low;
dma_addr_t high;
};
/* Moorestown supports three restricted access regions. */
#define MRST_NUM_RAR 3
/* Structure containing low and high RAR register offsets. */
struct RAR_offsets {
u32 low; /* Register offset for low RAR bus address. */
u32 high; /* Register offset for high RAR bus address. */
};
struct RAR_address_struct rar_addr[MRST_NUM_RAR];
struct client {
int (*client_callback)(void *client_data);
void *customer_data;
int client_called;
};
/* prototype for init */
static int __init rar_init_handler(void);
static void __exit rar_exit_handler(void);
static DEFINE_MUTEX(rar_mutex);
static DEFINE_MUTEX(lnc_reg_mutex);
/*
function that is activated on the successfull probe of the RAR device
*/
static int __devinit rar_probe(struct pci_dev *pdev,
const struct pci_device_id *ent);
struct RAR_device {
struct RAR_offsets const rar_offsets[MRST_NUM_RAR];
struct RAR_address_range rar_addr[MRST_NUM_RAR];
struct pci_dev *rar_dev;
bool registered;
};
static const struct pci_device_id rar_pci_id_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x4110) },
{ 0 }
/* this platform has only one rar_device for 3 rar regions */
static struct RAR_device my_rar_device = {
.rar_offsets = {
[0].low = LNC_BRAR0L,
[0].high = LNC_BRAR0H,
[1].low = LNC_BRAR1L,
[1].high = LNC_BRAR1H,
[2].low = LNC_BRAR2L,
[2].high = LNC_BRAR2H
}
};
MODULE_DEVICE_TABLE(pci, rar_pci_id_tbl);
/* this data is for handling requests from other drivers which arrive
* prior to this driver initializing
*/
/* field for registering driver to PCI device */
static struct pci_driver rar_pci_driver = {
.name = "rar_driver",
.id_table = rar_pci_id_tbl,
.probe = rar_probe
};
static struct client clients[MAX_RAR_CLIENTS];
static int num_clients;
/* This function is used to retrieved RAR info using the IPC message
bus interface */
static int memrar_get_rar_addr(struct pci_dev *pdev,
int offset,
u32 *addr)
/*
* This function is used to retrieved RAR info using the Lincroft
* message bus interface.
*/
static int retrieve_rar_addr(struct pci_dev *pdev,
int offset,
dma_addr_t *addr)
{
/*
* ======== The Lincroft Message Bus Interface ========
......@@ -131,243 +179,412 @@ static int memrar_get_rar_addr(struct pci_dev *pdev,
* Data being written to this register must be written before
* writing the appropriate control message to the MCR
* register.
*/
*/
int result;
int result = 0; /* result */
/* Construct control message */
u32 const message =
(LNC_MESSAGE_READ_OPCODE << 24)
| (LNC_BUNIT_PORT << 16)
| (offset << 8)
| (LNC_MESSAGE_BYTE_WRITE_ENABLES << 4);
(LNC_MESSAGE_READ_OPCODE << 24)
| (LNC_BUNIT_PORT << 16)
| (offset << 8)
| (LNC_MESSAGE_BYTE_WRITE_ENABLES << 4);
printk(KERN_WARNING "rar- offset to LNC MSG is %x\n", offset);
dev_dbg(&pdev->dev, "Offset for 'get' LNC MSG is %x\n", offset);
if (addr == 0)
if (addr == 0) {
WARN_ON(1);
return -EINVAL;
}
/*
* We synchronize access to the Lincroft MCR and MDR registers
* until BOTH the command is issued through the MCR register
* and the corresponding data is read from the MDR register.
* Otherwise a race condition would exist between accesses to
* both registers.
*/
mutex_lock(&lnc_reg_mutex);
/* Send the control message */
result = pci_write_config_dword(pdev,
LNC_MCR_OFFSET,
message);
result = pci_write_config_dword(pdev, LNC_MCR_OFFSET, message);
printk(KERN_WARNING "rar- result from send ctl register is %x\n",
result);
dev_dbg(&pdev->dev, "Result from send ctl register is %x\n", result);
if (!result)
result = pci_read_config_dword(pdev,
LNC_MDR_OFFSET,
addr);
if (!result) {
result = pci_read_config_dword(pdev, LNC_MDR_OFFSET,
(u32 *)addr);
dev_dbg(&pdev->dev,
"Result from read data register is %x\n", result);
printk(KERN_WARNING "rar- result from read data register is %x\n",
result);
dev_dbg(&pdev->dev,
"Value read from data register is %lx\n",
(unsigned long)*addr);
}
printk(KERN_WARNING "rar- value read from data register is %x\n",
*addr);
mutex_unlock(&lnc_reg_mutex);
if (result)
return -1;
else
return 0;
return result;
}
static int memrar_set_rar_addr(struct pci_dev *pdev,
int offset,
u32 addr)
static int set_rar_address(struct pci_dev *pdev,
int offset,
dma_addr_t addr)
{
/*
* ======== The Lincroft Message Bus Interface ========
* Lincroft registers may be obtained from the PCI
* (the Host Bridge) using the Lincroft Message Bus
* Interface. That message bus interface is generally
* comprised of two registers: a control register (MCR, 0xDO)
* and a data register (MDR, 0xD4).
*
* The MCR (message control register) format is the following:
* 1. [31:24]: Opcode
* 2. [23:16]: Port
* 3. [15:8]: Register Offset
* 4. [7:4]: Byte Enables (use 0xF to set all of these bits
* to 1)
* 5. [3:0]: reserved
*
* Read (0xD0) and write (0xE0) opcodes are written to the
* control register when reading and writing to Lincroft
* registers, respectively.
*
* We're interested in registers found in the Lincroft
* B-unit. The B-unit port is 0x3.
*
* The six B-unit RAR register offsets we use are listed
* earlier in this file.
*
* Lastly writing to the MCR register requires the "Byte
* enables" bits to be set to 1. This may be achieved by
* writing 0xF at bit 4.
*
* The MDR (message data register) format is the following:
* 1. [31:0]: Read/Write Data
*
* Data being read from this register is only available after
* writing the appropriate control message to the MCR
* register.
*
* Data being written to this register must be written before
* writing the appropriate control message to the MCR
* register.
*/
* Data being written to this register must be written before
* writing the appropriate control message to the MCR
* register.
* @note See rar_get_address() for a description of the
* message bus interface being used here.
*/
int result = 0; /* result */
int result = 0;
/* Construct control message */
u32 const message =
(LNC_MESSAGE_WRITE_OPCODE << 24)
| (LNC_BUNIT_PORT << 16)
| (offset << 8)
| (LNC_MESSAGE_BYTE_WRITE_ENABLES << 4);
printk(KERN_WARNING "rar- offset to LNC MSG is %x\n", offset);
u32 const message = (LNC_MESSAGE_WRITE_OPCODE << 24)
| (LNC_BUNIT_PORT << 16)
| (offset << 8)
| (LNC_MESSAGE_BYTE_WRITE_ENABLES << 4);
if (addr == 0)
if (addr == 0) {
WARN_ON(1);
return -EINVAL;
}
dev_dbg(&pdev->dev, "Offset for 'set' LNC MSG is %x\n", offset);
/*
* We synchronize access to the Lincroft MCR and MDR registers
* until BOTH the command is issued through the MCR register
* and the corresponding data is read from the MDR register.
* Otherwise a race condition would exist between accesses to
* both registers.
*/
mutex_lock(&lnc_reg_mutex);
/* Send the control message */
result = pci_write_config_dword(pdev,
LNC_MDR_OFFSET,
addr);
result = pci_write_config_dword(pdev, LNC_MDR_OFFSET, addr);
printk(KERN_WARNING "rar- result from send ctl register is %x\n",
result);
dev_dbg(&pdev->dev, "Result from write data register is %x\n", result);
if (!result)
result = pci_write_config_dword(pdev,
LNC_MCR_OFFSET,
message);
if (!result) {
dev_dbg(&pdev->dev,
"Value written to data register is %lx\n",
(unsigned long)addr);
printk(KERN_WARNING "rar- result from write data register is %x\n",
result);
result = pci_write_config_dword(pdev, LNC_MCR_OFFSET, message);
dev_dbg(&pdev->dev, "Result from send ctl register is %x\n",
result);
}
printk(KERN_WARNING "rar- value read to data register is %x\n",
addr);
mutex_unlock(&lnc_reg_mutex);
if (result)
return -1;
else
return 0;
return result;
}
/*
* Initialize RAR parameters, such as physical addresses, etc.
*/
static int memrar_init_rar_params(struct pci_dev *pdev)
* Initialize RAR parameters, such as bus addresses, etc.
*/
static int init_rar_params(struct pci_dev *pdev)
{
struct RAR_offsets const offsets[] = {
{ LNC_BRAR0L, LNC_BRAR0H },
{ LNC_BRAR1L, LNC_BRAR1H },
{ LNC_BRAR2L, LNC_BRAR2H }
};
size_t const num_offsets = sizeof(offsets) / sizeof(offsets[0]);
struct RAR_offsets const *end = offsets + num_offsets;
struct RAR_offsets const *i;
unsigned int n = 0;
unsigned int i;
int result = 0;
/* Retrieve RAR start and end physical addresses. */
/* Retrieve RAR start and end bus addresses.
* Access the RAR registers through the Lincroft Message Bus
* Interface on PCI device: 00:00.0 Host bridge.
*/
/*
* Access the RAR registers through the Lincroft Message Bus
* Interface on PCI device: 00:00.0 Host bridge.
*/
/* struct pci_dev *pdev = pci_get_bus_and_slot(0, PCI_DEVFN(0,0)); */
if (pdev == NULL)
return -ENODEV;
for (i = offsets; i != end; ++i, ++n) {
if (memrar_get_rar_addr(pdev,
(*i).low,
&(rar_addr[n].low)) != 0
|| memrar_get_rar_addr(pdev,
(*i).high,
&(rar_addr[n].high)) != 0) {
result = -1;
break;
for (i = 0; i < MRST_NUM_RAR; ++i) {
struct RAR_offsets const *offset =
&my_rar_device.rar_offsets[i];
struct RAR_address_range *addr = &my_rar_device.rar_addr[i];
if ((retrieve_rar_addr(pdev, offset->low, &addr->low) != 0)
|| (retrieve_rar_addr(pdev, offset->high, &addr->high) != 0)) {
result = -1;
break;
}
}
/*
* Only the upper 22 bits of the RAR addresses are
* stored in their corresponding RAR registers so we
* must set the lower 10 bits accordingly.
* The low address has its lower 10 bits cleared, and
* the high address has all its lower 10 bits set,
* e.g.:
* low = 0x2ffffc00
*/
addr->low &= (dma_addr_t)0xfffffc00u;
/*
* Set bits 9:0 on uppser address if bits 31:10 are non
* zero; otherwize clear all bits
*/
if ((addr->high & 0xfffffc00u) == 0)
addr->high = 0;
else
addr->high |= 0x3ffu;
}
/* Done accessing the device. */
/* pci_dev_put(pdev); */
if (result == 0) {
if (1) {
size_t z;
for (z = 0; z != MRST_NUM_RAR; ++z) {
printk(KERN_WARNING
"rar - BRAR[%Zd] physical address low\n"
"\tlow: 0x%08x\n"
"\thigh: 0x%08x\n",
z,
rar_addr[z].low,
rar_addr[z].high);
}
int z;
for (z = 0; z != MRST_NUM_RAR; ++z) {
/*
* "BRAR" refers to the RAR registers in the
* Lincroft B-unit.
*/
dev_info(&pdev->dev, "BRAR[%u] bus address range = "
"[%lx, %lx]\n", z,
(unsigned long)my_rar_device.rar_addr[z].low,
(unsigned long)my_rar_device.rar_addr[z].high);
}
}
return result;
}
/*
* The rar_get_address function is used by other device drivers
* to obtain RAR address information on a RAR. It takes three
* parameters:
*
* int rar_index
* The rar_index is an index to the rar for which you wish to retrieve
* the address information.
* Values can be 0,1, or 2.
*
* The function returns a 0 upon success or a -1 if there is no RAR
* facility on this system.
*/
int rar_get_address(int rar_index,
dma_addr_t *start_address,
dma_addr_t *end_address)
{
int result = -ENODEV;
if (my_rar_device.registered) {
if (start_address == 0 || end_address == 0
|| rar_index >= MRST_NUM_RAR || rar_index < 0) {
result = -EINVAL;
} else {
*start_address =
my_rar_device.rar_addr[rar_index].low;
*end_address =
my_rar_device.rar_addr[rar_index].high;
result = 0;
}
}
return result;
}
EXPORT_SYMBOL(rar_get_address);
/*
function that is activated on the successfull probe of the RAR device
* The rar_lock function is ued by other device drivers to lock an RAR.
* once an RAR is locked, it stays locked until the next system reboot.
* The function takes one parameter:
*
* int rar_index
* The rar_index is an index to the rar that you want to lock.
* Values can be 0,1, or 2.
*
* The function returns a 0 upon success or a -1 if there is no RAR
* facility on this system.
*/
int rar_lock(int rar_index)
{
int result = -ENODEV;
if (rar_index >= MRST_NUM_RAR || rar_index < 0) {
result = -EINVAL;
return result;
}
dev_dbg(&my_rar_device.rar_dev->dev, "rar_lock mutex locking\n");
mutex_lock(&rar_mutex);
if (my_rar_device.registered) {
dma_addr_t low = my_rar_device.rar_addr[rar_index].low &
0xfffffc00u;
dma_addr_t high = my_rar_device.rar_addr[rar_index].high &
0xfffffc00u;
/*
* Only allow I/O from the graphics and Langwell;
* Not from the x96 processor
*/
if (rar_index == (int)RAR_TYPE_VIDEO) {
low |= 0x00000009;
high |= 0x00000015;
}
else if (rar_index == (int)RAR_TYPE_AUDIO) {
/* Only allow I/O from Langwell; nothing from x86 */
low |= 0x00000008;
high |= 0x00000018;
}
else
/* Read-only from all agents */
high |= 0x00000018;
/*
* Now program the register using the Lincroft message
* bus interface.
*/
result = set_rar_address(my_rar_device.rar_dev,
my_rar_device.rar_offsets[rar_index].low,
low);
if (result == 0)
result = set_rar_address(
my_rar_device.rar_dev,
my_rar_device.rar_offsets[rar_index].high,
high);
}
dev_dbg(&my_rar_device.rar_dev->dev, "rar_lock mutex unlocking\n");
mutex_unlock(&rar_mutex);
return result;
}
EXPORT_SYMBOL(rar_lock);
/* The register_rar function is to used by other device drivers
* to ensure that this driver is ready. As we cannot be sure of
* the compile/execute order of dirvers in ther kernel, it is
* best to give this driver a callback function to call when
* it is ready to give out addresses. The callback function
* would have those steps that continue the initialization of
* a driver that do require a valid RAR address. One of those
* steps would be to call rar_get_address()
* This function return 0 on success an -1 on failure.
*/
static int __devinit rar_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
int register_rar(int (*callback)(void *yourparameter), void *yourparameter)
{
/* error */
int error;
/*------------------------
CODE
---------------------------*/
int result = -ENODEV;
DEBUG_PRINT_0(RAR_DEBUG_LEVEL_EXTENDED,
"Rar pci probe starting\n");
error = 0;
if (callback == NULL)
return -EINVAL;
mutex_lock(&rar_mutex);
if (my_rar_device.registered) {
mutex_unlock(&rar_mutex);
/*
* if the driver already registered, then we can simply
* call the callback right now
*/
return (*callback)(yourparameter);
}
if (num_clients < MRST_NUM_RAR) {
clients[num_clients].client_callback = callback;
clients[num_clients].customer_data = yourparameter;
num_clients += 1;
result = 0;
}
mutex_unlock(&rar_mutex);
return result;
}
EXPORT_SYMBOL(register_rar);
/*
* This function registers the driver with the device subsystem (
* either PCI, USB, etc).
* Function that is activaed on the succesful probe of the RAR device
* (Moorestown host controller).
*/
static int rar_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int error;
int counter;
dev_dbg(&dev->dev, "PCI probe starting\n");
/* enable the device */
error = pci_enable_device(pdev);
error = pci_enable_device(dev);
if (error) {
DEBUG_PRINT_0(RAR_DEBUG_LEVEL_EXTENDED,
"error enabling pci device\n");
dev_err(&dev->dev,
"Error enabling RAR register PCI device\n");
goto end_function;
}
rar_dev = pdev;
registered = 1;
/* Initialize the RAR parameters, which have to be retrieved */
/* via the message bus service */
error = memrar_init_rar_params(rar_dev);
/* we have only one device; fill in the rar_device structure */
my_rar_device.rar_dev = dev;
/*
* Initialize the RAR parameters, which have to be retrieved
* via the message bus interface.
*/
error = init_rar_params(dev);
if (error) {
DEBUG_PRINT_0(RAR_DEBUG_LEVEL_EXTENDED,
"error getting RAR addresses device\n");
registered = 0;
pci_disable_device(dev);
dev_err(&dev->dev,
"Error retrieving RAR addresses\n");
goto end_function;
}
dev_dbg(&dev->dev, "PCI probe locking\n");
mutex_lock(&rar_mutex);
my_rar_device.registered = 1;
/* now call anyone who has registered (using callbacks) */
for (counter = 0; counter < num_clients; counter += 1) {
if (clients[counter].client_callback) {
error = (*clients[counter].client_callback)(
clients[counter].customer_data);
/* set callback to NULL to indicate it has been done */
clients[counter].client_callback = NULL;
dev_dbg(&my_rar_device.rar_dev->dev,
"Callback called for %d\n",
counter);
}
}
dev_dbg(&dev->dev, "PCI probe unlocking\n");
mutex_unlock(&rar_mutex);
end_function:
return error;
}
/*
this function registers the driver to
the device subsystem (either PCI, USB, etc)
*/
const struct pci_device_id rar_pci_id_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_RAR_DEVICE_ID) },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, rar_pci_id_tbl);
const struct pci_device_id *my_id_table = rar_pci_id_tbl;
/* field for registering driver to PCI device */
static struct pci_driver rar_pci_driver = {
.name = "rar_register_driver",
.id_table = rar_pci_id_tbl,
.probe = rar_probe
};
static int __init rar_init_handler(void)
{
return pci_register_driver(&rar_pci_driver);
......@@ -382,59 +599,4 @@ module_init(rar_init_handler);
module_exit(rar_exit_handler);
MODULE_LICENSE("GPL");
/* The get_rar_address function is used by other device drivers
* to obtain RAR address information on a RAR. It takes two
* parameter:
*
* int rar_index
* The rar_index is an index to the rar for which you wish to retrieve
* the address information.
* Values can be 0,1, or 2.
*
* struct RAR_address_struct is a pointer to a place to which the function
* can return the address structure for the RAR.
*
* The function returns a 0 upon success or a -1 if there is no RAR
* facility on this system.
*/
int get_rar_address(int rar_index, struct RAR_address_struct *addresses)
{
if (registered && (rar_index < 3) && (rar_index >= 0)) {
*addresses = rar_addr[rar_index];
/* strip off lock bit information */
addresses->low = addresses->low & 0xfffffff0;
addresses->high = addresses->high & 0xfffffff0;
return 0;
} else
return -ENODEV;
}
EXPORT_SYMBOL(get_rar_address);
/* The lock_rar function is used by other device drivers to lock an RAR.
* once an RAR is locked, it stays locked until the next system reboot.
* The function takes one parameter:
*
* int rar_index
* The rar_index is an index to the rar that you want to lock.
* Values can be 0,1, or 2.
*
* The function returns a 0 upon success or a -1 if there is no RAR
* facility on this system.
*/
int lock_rar(int rar_index)
{
u32 working_addr;
int result;
if (registered && (rar_index < 3) && (rar_index >= 0)) {
/* first make sure that lock bits are clear (this does lock) */
working_addr = rar_addr[rar_index].low & 0xfffffff0;
/* now send that value to the register using the IPC */
result = memrar_set_rar_addr(rar_dev, rar_index, working_addr);
return result;
} else
return -ENODEV;
}
MODULE_DESCRIPTION("Intel Restricted Access Region Register Driver");
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