Delete drivers/char/i810_rng.c, superceded.
Rename Doc/i810_rng.txt to Doc/hw_random.txt.
Rename drv/char/amd768_rng.c to drv/char/hw_random.c.
--- /dev/null
+ Hardware driver for Intel i810 Random Number Generator (RNG)
+ Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
+ Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
+
+Introduction:
+
+ The i810_rng device driver is software that makes use of a
+ special hardware feature on the Intel i8xx-based chipsets,
+ a Random Number Generator (RNG).
+
+ In order to make effective use of this device driver, you
+ should download the support software as well. Download the
+ latest version of the "intel-rng-tools" package from the
+ i810_rng driver's official Web site:
+
+ http://sourceforge.net/projects/gkernel/
+
+About the Intel RNG hardware, from the firmware hub datasheet:
+
+ The Firmware Hub integrates a Random Number Generator (RNG)
+ using thermal noise generated from inherently random quantum
+ mechanical properties of silicon. When not generating new random
+ bits the RNG circuitry will enter a low power state. Intel will
+ provide a binary software driver to give third party software
+ access to our RNG for use as a security feature. At this time,
+ the RNG is only to be used with a system in an OS-present state.
+
+Theory of operation:
+
+ Character driver. Using the standard open()
+ and read() system calls, you can read random data from
+ the i810 RNG device. This data is NOT CHECKED by any
+ fitness tests, and could potentially be bogus (if the
+ hardware is faulty or has been tampered with). Data is only
+ output if the hardware "has-data" flag is set, but nevertheless
+ a security-conscious person would run fitness tests on the
+ data before assuming it is truly random.
+
+ /dev/intel_rng is char device major 10, minor 183.
+
+Driver notes:
+
+ * FIXME: support poll(2)
+
+ NOTE: request_mem_region was removed, for two reasons:
+ 1) Only one RNG is supported by this driver, 2) The location
+ used by the RNG is a fixed location in MMIO-addressable memory,
+ 3) users with properly working BIOS e820 handling will always
+ have the region in which the RNG is located reserved, so
+ request_mem_region calls always fail for proper setups.
+ However, for people who use mem=XX, BIOS e820 information is
+ -not- in /proc/iomem, and request_mem_region(RNG_ADDR) can
+ succeed.
+
+Driver details:
+
+ Based on:
+ Intel 82802AB/82802AC Firmware Hub (FWH) Datasheet
+ May 1999 Order Number: 290658-002 R
+
+ Intel 82802 Firmware Hub: Random Number Generator
+ Programmer's Reference Manual
+ December 1999 Order Number: 298029-001 R
+
+ Intel 82802 Firmware HUB Random Number Generator Driver
+ Copyright (c) 2000 Matt Sottek <msottek@quiknet.com>
+
+ Special thanks to Matt Sottek. I did the "guts", he
+ did the "brains" and all the testing.
+
+Change history:
+
+ Version 0.9.8:
+ * Support other i8xx chipsets by adding 82801E detection
+ * 82801DB detection is the same as for 82801CA.
+
+ Version 0.9.7:
+ * Support other i8xx chipsets too (by adding 82801BA(M) and
+ 82801CA(M) detection)
+
+ Version 0.9.6:
+ * Internal driver cleanups, prep for 1.0.0 release.
+
+ Version 0.9.5:
+ * Rip out entropy injection via timer. It never ever worked,
+ and a better solution (rngd) is now available.
+
+ Version 0.9.4:
+ * Fix: Remove request_mem_region
+ * Fix: Horrible bugs in FIPS calculation and test execution
+
+ Version 0.9.3:
+ * Clean up rng_read a bit.
+ * Update i810_rng driver Web site URL.
+ * Increase default timer interval to 4 samples per second.
+ * Abort if mem region is not available.
+ * BSS zero-initialization cleanup.
+ * Call misc_register() from rng_init_one.
+ * Fix O_NONBLOCK to occur before we schedule.
+
+ Version 0.9.2:
+ * Simplify open blocking logic
+
+ Version 0.9.1:
+ * Support i815 chipsets too (Matt Sottek)
+ * Fix reference counting when statically compiled (prumpf)
+ * Rewrite rng_dev_read (prumpf)
+ * Make module races less likely (prumpf)
+ * Small miscellaneous bug fixes (prumpf)
+ * Use pci table for PCI id list
+
+ Version 0.9.0:
+ * Don't register a pci_driver, because we are really
+ using PCI bridge vendor/device ids, and someone
+ may want to register a driver for the bridge. (bug fix)
+ * Don't let the usage count go negative (bug fix)
+ * Clean up spinlocks (bug fix)
+ * Enable PCI device, if necessary (bug fix)
+ * iounmap on module unload (bug fix)
+ * If RNG chrdev is already in use when open(2) is called,
+ sleep until it is available.
+ * Remove redundant globals rng_allocated, rng_use_count
+ * Convert numeric globals to unsigned
+ * Module unload cleanup
+
+ Version 0.6.2:
+ * Clean up spinlocks. Since we don't have any interrupts
+ to worry about, but we do have a timer to worry about,
+ we use spin_lock_bh everywhere except the timer function
+ itself.
+ * Fix module load/unload.
+ * Fix timer function and h/w enable/disable logic
+ * New timer interval sysctl
+ * Clean up sysctl names
+++ /dev/null
- Hardware driver for Intel i810 Random Number Generator (RNG)
- Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
- Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
-
-Introduction:
-
- The i810_rng device driver is software that makes use of a
- special hardware feature on the Intel i8xx-based chipsets,
- a Random Number Generator (RNG).
-
- In order to make effective use of this device driver, you
- should download the support software as well. Download the
- latest version of the "intel-rng-tools" package from the
- i810_rng driver's official Web site:
-
- http://sourceforge.net/projects/gkernel/
-
-About the Intel RNG hardware, from the firmware hub datasheet:
-
- The Firmware Hub integrates a Random Number Generator (RNG)
- using thermal noise generated from inherently random quantum
- mechanical properties of silicon. When not generating new random
- bits the RNG circuitry will enter a low power state. Intel will
- provide a binary software driver to give third party software
- access to our RNG for use as a security feature. At this time,
- the RNG is only to be used with a system in an OS-present state.
-
-Theory of operation:
-
- Character driver. Using the standard open()
- and read() system calls, you can read random data from
- the i810 RNG device. This data is NOT CHECKED by any
- fitness tests, and could potentially be bogus (if the
- hardware is faulty or has been tampered with). Data is only
- output if the hardware "has-data" flag is set, but nevertheless
- a security-conscious person would run fitness tests on the
- data before assuming it is truly random.
-
- /dev/intel_rng is char device major 10, minor 183.
-
-Driver notes:
-
- * FIXME: support poll(2)
-
- NOTE: request_mem_region was removed, for two reasons:
- 1) Only one RNG is supported by this driver, 2) The location
- used by the RNG is a fixed location in MMIO-addressable memory,
- 3) users with properly working BIOS e820 handling will always
- have the region in which the RNG is located reserved, so
- request_mem_region calls always fail for proper setups.
- However, for people who use mem=XX, BIOS e820 information is
- -not- in /proc/iomem, and request_mem_region(RNG_ADDR) can
- succeed.
-
-Driver details:
-
- Based on:
- Intel 82802AB/82802AC Firmware Hub (FWH) Datasheet
- May 1999 Order Number: 290658-002 R
-
- Intel 82802 Firmware Hub: Random Number Generator
- Programmer's Reference Manual
- December 1999 Order Number: 298029-001 R
-
- Intel 82802 Firmware HUB Random Number Generator Driver
- Copyright (c) 2000 Matt Sottek <msottek@quiknet.com>
-
- Special thanks to Matt Sottek. I did the "guts", he
- did the "brains" and all the testing.
-
-Change history:
-
- Version 0.9.8:
- * Support other i8xx chipsets by adding 82801E detection
- * 82801DB detection is the same as for 82801CA.
-
- Version 0.9.7:
- * Support other i8xx chipsets too (by adding 82801BA(M) and
- 82801CA(M) detection)
-
- Version 0.9.6:
- * Internal driver cleanups, prep for 1.0.0 release.
-
- Version 0.9.5:
- * Rip out entropy injection via timer. It never ever worked,
- and a better solution (rngd) is now available.
-
- Version 0.9.4:
- * Fix: Remove request_mem_region
- * Fix: Horrible bugs in FIPS calculation and test execution
-
- Version 0.9.3:
- * Clean up rng_read a bit.
- * Update i810_rng driver Web site URL.
- * Increase default timer interval to 4 samples per second.
- * Abort if mem region is not available.
- * BSS zero-initialization cleanup.
- * Call misc_register() from rng_init_one.
- * Fix O_NONBLOCK to occur before we schedule.
-
- Version 0.9.2:
- * Simplify open blocking logic
-
- Version 0.9.1:
- * Support i815 chipsets too (Matt Sottek)
- * Fix reference counting when statically compiled (prumpf)
- * Rewrite rng_dev_read (prumpf)
- * Make module races less likely (prumpf)
- * Small miscellaneous bug fixes (prumpf)
- * Use pci table for PCI id list
-
- Version 0.9.0:
- * Don't register a pci_driver, because we are really
- using PCI bridge vendor/device ids, and someone
- may want to register a driver for the bridge. (bug fix)
- * Don't let the usage count go negative (bug fix)
- * Clean up spinlocks (bug fix)
- * Enable PCI device, if necessary (bug fix)
- * iounmap on module unload (bug fix)
- * If RNG chrdev is already in use when open(2) is called,
- sleep until it is available.
- * Remove redundant globals rng_allocated, rng_use_count
- * Convert numeric globals to unsigned
- * Module unload cleanup
-
- Version 0.6.2:
- * Clean up spinlocks. Since we don't have any interrupts
- to worry about, but we do have a timer to worry about,
- we use spin_lock_bh everywhere except the timer function
- itself.
- * Fix module load/unload.
- * Fix timer function and h/w enable/disable logic
- * New timer interval sysctl
- * Clean up sysctl names
+++ /dev/null
-/*
- Hardware driver for the AMD 768 Random Number Generator (RNG)
- (c) Copyright 2001 Red Hat Inc <alan@redhat.com>
-
- derived from
-
- Hardware driver for Intel i810 Random Number Generator (RNG)
- Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
- Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
-
- Please read Documentation/i810_rng.txt for details on use.
-
- ----------------------------------------------------------
- This software may be used and distributed according to the terms
- of the GNU General Public License, incorporated herein by reference.
-
- */
-
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/random.h>
-#include <linux/miscdevice.h>
-#include <linux/smp_lock.h>
-#include <linux/mm.h>
-#include <linux/delay.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-
-
-/*
- * core module and version information
- */
-#define RNG_VERSION "0.1.0"
-#define RNG_MODULE_NAME "amd768_rng"
-#define RNG_DRIVER_NAME RNG_MODULE_NAME " hardware driver " RNG_VERSION
-#define PFX RNG_MODULE_NAME ": "
-
-
-/*
- * debugging macros
- */
-#undef RNG_DEBUG /* define to enable copious debugging info */
-
-#ifdef RNG_DEBUG
-/* note: prints function name for you */
-#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
-#else
-#define DPRINTK(fmt, args...)
-#endif
-
-#undef RNG_NDEBUG /* define to disable lightweight runtime checks */
-#ifdef RNG_NDEBUG
-#define assert(expr)
-#else
-#define assert(expr) \
- if(!(expr)) { \
- printk( "Assertion failed! %s,%s,%s,line=%d\n", \
- #expr,__FILE__,__FUNCTION__,__LINE__); \
- }
-#endif
-
-#define RNG_MISCDEV_MINOR 183 /* official */
-
-/*
- * various RNG status variables. they are globals
- * as we only support a single RNG device
- */
-
-static u32 pmbase; /* PMxx I/O base */
-static struct semaphore rng_open_sem; /* Semaphore for serializing rng_open/release */
-
-
-/*
- * inlined helper functions for accessing RNG registers
- */
-
-static inline int rng_data_present (void)
-{
- return inl(pmbase+0xF4) & 1;
-}
-
-
-static inline int rng_data_read (void)
-{
- return inl(pmbase+0xF0);
-}
-
-static int rng_dev_open (struct inode *inode, struct file *filp)
-{
- if ((filp->f_mode & FMODE_READ) == 0)
- return -EINVAL;
- if (filp->f_mode & FMODE_WRITE)
- return -EINVAL;
-
- /* wait for device to become free */
- if (filp->f_flags & O_NONBLOCK) {
- if (down_trylock (&rng_open_sem))
- return -EAGAIN;
- } else {
- if (down_interruptible (&rng_open_sem))
- return -ERESTARTSYS;
- }
- return 0;
-}
-
-
-static int rng_dev_release (struct inode *inode, struct file *filp)
-{
- up(&rng_open_sem);
- return 0;
-}
-
-
-static ssize_t rng_dev_read (struct file *filp, char *buf, size_t size,
- loff_t * offp)
-{
- static spinlock_t rng_lock = SPIN_LOCK_UNLOCKED;
- int have_data;
- u32 data = 0;
- ssize_t ret = 0;
-
- while (size) {
- spin_lock(&rng_lock);
-
- have_data = 0;
- if (rng_data_present()) {
- data = rng_data_read();
- have_data = 4;
- }
-
- spin_unlock (&rng_lock);
-
- while (have_data > 0) {
- if (put_user((u8)data, buf++)) {
- ret = ret ? : -EFAULT;
- break;
- }
- size--;
- ret++;
- have_data--;
- data>>=8;
- }
-
- if (filp->f_flags & O_NONBLOCK)
- return ret ? : -EAGAIN;
-
- if(need_resched())
- {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(1);
- }
- else
- udelay(200); /* FIXME: We could poll for 250uS ?? */
-
- if (signal_pending (current))
- return ret ? : -ERESTARTSYS;
- }
- return ret;
-}
-
-
-static struct file_operations rng_chrdev_ops = {
- .owner = THIS_MODULE,
- .open = rng_dev_open,
- .release = rng_dev_release,
- .read = rng_dev_read,
-};
-
-
-static struct miscdevice rng_miscdev = {
- RNG_MISCDEV_MINOR,
- RNG_MODULE_NAME,
- &rng_chrdev_ops,
-};
-
-
-/*
- * rng_init_one - look for and attempt to init a single RNG
- */
-static int __init rng_init_one (struct pci_dev *dev)
-{
- int rc;
- u8 rnen;
-
- DPRINTK ("ENTER\n");
-
- rc = misc_register (&rng_miscdev);
- if (rc) {
- printk (KERN_ERR PFX "cannot register misc device\n");
- DPRINTK ("EXIT, returning %d\n", rc);
- goto err_out;
- }
-
- pci_read_config_dword(dev, 0x58, &pmbase);
-
- pmbase&=0x0000FF00;
-
- if(pmbase == 0)
- {
- printk (KERN_ERR PFX "power management base not set\n");
- DPRINTK ("EXIT, returning %d\n", rc);
- goto err_out_free_miscdev;
- }
-
- pci_read_config_byte(dev, 0x40, &rnen);
- rnen|=(1<<7); /* RNG on */
- pci_write_config_byte(dev, 0x40, rnen);
-
- pci_read_config_byte(dev, 0x41, &rnen);
- rnen|=(1<<7); /* PMIO enable */
- pci_write_config_byte(dev, 0x41, rnen);
-
- printk(KERN_INFO PFX "AMD768 system management I/O registers at 0x%X.\n", pmbase);
- DPRINTK ("EXIT, returning 0\n");
- return 0;
-
-err_out_free_miscdev:
- misc_deregister (&rng_miscdev);
-err_out:
- return rc;
-}
-
-
-/*
- * Data for PCI driver interface
- *
- * This data only exists for exporting the supported
- * PCI ids via MODULE_DEVICE_TABLE. We do not actually
- * register a pci_driver, because someone else might one day
- * want to register another driver on the same PCI id.
- */
-static struct pci_device_id rng_pci_tbl[] __initdata = {
- { 0x1022, 0x7443, PCI_ANY_ID, PCI_ANY_ID, },
- { 0, },
-};
-MODULE_DEVICE_TABLE (pci, rng_pci_tbl);
-
-
-MODULE_AUTHOR("Alan Cox, Jeff Garzik, Philipp Rumpf, Matt Sottek");
-MODULE_DESCRIPTION("AMD 768 Random Number Generator (RNG) driver");
-MODULE_LICENSE("GPL");
-
-
-/*
- * rng_init - initialize RNG module
- */
-static int __init rng_init (void)
-{
- int rc;
- struct pci_dev *pdev;
-
- DPRINTK ("ENTER\n");
-
- init_MUTEX (&rng_open_sem);
-
- pci_for_each_dev(pdev) {
- if (pci_match_device (rng_pci_tbl, pdev) != NULL)
- goto match;
- }
-
- DPRINTK ("EXIT, returning -ENODEV\n");
- return -ENODEV;
-
-match:
- rc = rng_init_one (pdev);
- if (rc)
- return rc;
-
- printk (KERN_INFO RNG_DRIVER_NAME " loaded\n");
-
- DPRINTK ("EXIT, returning 0\n");
- return 0;
-}
-
-
-/*
- * rng_init - shutdown RNG module
- */
-static void __exit rng_cleanup (void)
-{
- DPRINTK ("ENTER\n");
- misc_deregister (&rng_miscdev);
- DPRINTK ("EXIT\n");
-}
-
-
-module_init (rng_init);
-module_exit (rng_cleanup);
--- /dev/null
+/*
+ Hardware driver for the AMD 768 Random Number Generator (RNG)
+ (c) Copyright 2001 Red Hat Inc <alan@redhat.com>
+
+ derived from
+
+ Hardware driver for Intel i810 Random Number Generator (RNG)
+ Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
+ Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
+
+ Please read Documentation/i810_rng.txt for details on use.
+
+ ----------------------------------------------------------
+ This software may be used and distributed according to the terms
+ of the GNU General Public License, incorporated herein by reference.
+
+ */
+
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/random.h>
+#include <linux/miscdevice.h>
+#include <linux/smp_lock.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+
+/*
+ * core module and version information
+ */
+#define RNG_VERSION "0.1.0"
+#define RNG_MODULE_NAME "amd768_rng"
+#define RNG_DRIVER_NAME RNG_MODULE_NAME " hardware driver " RNG_VERSION
+#define PFX RNG_MODULE_NAME ": "
+
+
+/*
+ * debugging macros
+ */
+#undef RNG_DEBUG /* define to enable copious debugging info */
+
+#ifdef RNG_DEBUG
+/* note: prints function name for you */
+#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
+#else
+#define DPRINTK(fmt, args...)
+#endif
+
+#undef RNG_NDEBUG /* define to disable lightweight runtime checks */
+#ifdef RNG_NDEBUG
+#define assert(expr)
+#else
+#define assert(expr) \
+ if(!(expr)) { \
+ printk( "Assertion failed! %s,%s,%s,line=%d\n", \
+ #expr,__FILE__,__FUNCTION__,__LINE__); \
+ }
+#endif
+
+#define RNG_MISCDEV_MINOR 183 /* official */
+
+/*
+ * various RNG status variables. they are globals
+ * as we only support a single RNG device
+ */
+
+static u32 pmbase; /* PMxx I/O base */
+static struct semaphore rng_open_sem; /* Semaphore for serializing rng_open/release */
+
+
+/*
+ * inlined helper functions for accessing RNG registers
+ */
+
+static inline int rng_data_present (void)
+{
+ return inl(pmbase+0xF4) & 1;
+}
+
+
+static inline int rng_data_read (void)
+{
+ return inl(pmbase+0xF0);
+}
+
+static int rng_dev_open (struct inode *inode, struct file *filp)
+{
+ if ((filp->f_mode & FMODE_READ) == 0)
+ return -EINVAL;
+ if (filp->f_mode & FMODE_WRITE)
+ return -EINVAL;
+
+ /* wait for device to become free */
+ if (filp->f_flags & O_NONBLOCK) {
+ if (down_trylock (&rng_open_sem))
+ return -EAGAIN;
+ } else {
+ if (down_interruptible (&rng_open_sem))
+ return -ERESTARTSYS;
+ }
+ return 0;
+}
+
+
+static int rng_dev_release (struct inode *inode, struct file *filp)
+{
+ up(&rng_open_sem);
+ return 0;
+}
+
+
+static ssize_t rng_dev_read (struct file *filp, char *buf, size_t size,
+ loff_t * offp)
+{
+ static spinlock_t rng_lock = SPIN_LOCK_UNLOCKED;
+ int have_data;
+ u32 data = 0;
+ ssize_t ret = 0;
+
+ while (size) {
+ spin_lock(&rng_lock);
+
+ have_data = 0;
+ if (rng_data_present()) {
+ data = rng_data_read();
+ have_data = 4;
+ }
+
+ spin_unlock (&rng_lock);
+
+ while (have_data > 0) {
+ if (put_user((u8)data, buf++)) {
+ ret = ret ? : -EFAULT;
+ break;
+ }
+ size--;
+ ret++;
+ have_data--;
+ data>>=8;
+ }
+
+ if (filp->f_flags & O_NONBLOCK)
+ return ret ? : -EAGAIN;
+
+ if(need_resched())
+ {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(1);
+ }
+ else
+ udelay(200); /* FIXME: We could poll for 250uS ?? */
+
+ if (signal_pending (current))
+ return ret ? : -ERESTARTSYS;
+ }
+ return ret;
+}
+
+
+static struct file_operations rng_chrdev_ops = {
+ .owner = THIS_MODULE,
+ .open = rng_dev_open,
+ .release = rng_dev_release,
+ .read = rng_dev_read,
+};
+
+
+static struct miscdevice rng_miscdev = {
+ RNG_MISCDEV_MINOR,
+ RNG_MODULE_NAME,
+ &rng_chrdev_ops,
+};
+
+
+/*
+ * rng_init_one - look for and attempt to init a single RNG
+ */
+static int __init rng_init_one (struct pci_dev *dev)
+{
+ int rc;
+ u8 rnen;
+
+ DPRINTK ("ENTER\n");
+
+ rc = misc_register (&rng_miscdev);
+ if (rc) {
+ printk (KERN_ERR PFX "cannot register misc device\n");
+ DPRINTK ("EXIT, returning %d\n", rc);
+ goto err_out;
+ }
+
+ pci_read_config_dword(dev, 0x58, &pmbase);
+
+ pmbase&=0x0000FF00;
+
+ if(pmbase == 0)
+ {
+ printk (KERN_ERR PFX "power management base not set\n");
+ DPRINTK ("EXIT, returning %d\n", rc);
+ goto err_out_free_miscdev;
+ }
+
+ pci_read_config_byte(dev, 0x40, &rnen);
+ rnen|=(1<<7); /* RNG on */
+ pci_write_config_byte(dev, 0x40, rnen);
+
+ pci_read_config_byte(dev, 0x41, &rnen);
+ rnen|=(1<<7); /* PMIO enable */
+ pci_write_config_byte(dev, 0x41, rnen);
+
+ printk(KERN_INFO PFX "AMD768 system management I/O registers at 0x%X.\n", pmbase);
+ DPRINTK ("EXIT, returning 0\n");
+ return 0;
+
+err_out_free_miscdev:
+ misc_deregister (&rng_miscdev);
+err_out:
+ return rc;
+}
+
+
+/*
+ * Data for PCI driver interface
+ *
+ * This data only exists for exporting the supported
+ * PCI ids via MODULE_DEVICE_TABLE. We do not actually
+ * register a pci_driver, because someone else might one day
+ * want to register another driver on the same PCI id.
+ */
+static struct pci_device_id rng_pci_tbl[] __initdata = {
+ { 0x1022, 0x7443, PCI_ANY_ID, PCI_ANY_ID, },
+ { 0, },
+};
+MODULE_DEVICE_TABLE (pci, rng_pci_tbl);
+
+
+MODULE_AUTHOR("Alan Cox, Jeff Garzik, Philipp Rumpf, Matt Sottek");
+MODULE_DESCRIPTION("AMD 768 Random Number Generator (RNG) driver");
+MODULE_LICENSE("GPL");
+
+
+/*
+ * rng_init - initialize RNG module
+ */
+static int __init rng_init (void)
+{
+ int rc;
+ struct pci_dev *pdev;
+
+ DPRINTK ("ENTER\n");
+
+ init_MUTEX (&rng_open_sem);
+
+ pci_for_each_dev(pdev) {
+ if (pci_match_device (rng_pci_tbl, pdev) != NULL)
+ goto match;
+ }
+
+ DPRINTK ("EXIT, returning -ENODEV\n");
+ return -ENODEV;
+
+match:
+ rc = rng_init_one (pdev);
+ if (rc)
+ return rc;
+
+ printk (KERN_INFO RNG_DRIVER_NAME " loaded\n");
+
+ DPRINTK ("EXIT, returning 0\n");
+ return 0;
+}
+
+
+/*
+ * rng_init - shutdown RNG module
+ */
+static void __exit rng_cleanup (void)
+{
+ DPRINTK ("ENTER\n");
+ misc_deregister (&rng_miscdev);
+ DPRINTK ("EXIT\n");
+}
+
+
+module_init (rng_init);
+module_exit (rng_cleanup);
+++ /dev/null
-/*
-
- Hardware driver for Intel i810 Random Number Generator (RNG)
- Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
- Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
-
- Driver Web site: http://sourceforge.net/projects/gkernel/
-
- Please read Documentation/i810_rng.txt for details on use.
-
- ----------------------------------------------------------
-
- This software may be used and distributed according to the terms
- of the GNU General Public License, incorporated herein by reference.
-
- */
-
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/random.h>
-#include <linux/miscdevice.h>
-#include <linux/smp_lock.h>
-#include <linux/mm.h>
-#include <linux/delay.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-
-
-/*
- * core module and version information
- */
-#define RNG_VERSION "0.9.8"
-#define RNG_MODULE_NAME "i810_rng"
-#define RNG_DRIVER_NAME RNG_MODULE_NAME " hardware driver " RNG_VERSION
-#define PFX RNG_MODULE_NAME ": "
-
-
-/*
- * debugging macros
- */
-#undef RNG_DEBUG /* define to enable copious debugging info */
-
-#ifdef RNG_DEBUG
-/* note: prints function name for you */
-#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
-#else
-#define DPRINTK(fmt, args...)
-#endif
-
-#undef RNG_NDEBUG /* define to disable lightweight runtime checks */
-#ifdef RNG_NDEBUG
-#define assert(expr)
-#else
-#define assert(expr) \
- if(!(expr)) { \
- printk( "Assertion failed! %s,%s,%s,line=%d\n", \
- #expr,__FILE__,__FUNCTION__,__LINE__); \
- }
-#endif
-
-
-/*
- * RNG registers (offsets from rng_mem)
- */
-#define RNG_HW_STATUS 0
-#define RNG_PRESENT 0x40
-#define RNG_ENABLED 0x01
-#define RNG_STATUS 1
-#define RNG_DATA_PRESENT 0x01
-#define RNG_DATA 2
-
-/*
- * Magic address at which Intel PCI bridges locate the RNG
- */
-#define RNG_ADDR 0xFFBC015F
-#define RNG_ADDR_LEN 3
-
-#define RNG_MISCDEV_MINOR 183 /* official */
-
-/*
- * various RNG status variables. they are globals
- * as we only support a single RNG device
- */
-static void *rng_mem; /* token to our ioremap'd RNG register area */
-static struct semaphore rng_open_sem; /* Semaphore for serializing rng_open/release */
-
-
-/*
- * inlined helper functions for accessing RNG registers
- */
-static inline u8 rng_hwstatus (void)
-{
- assert (rng_mem != NULL);
- return readb (rng_mem + RNG_HW_STATUS);
-}
-
-static inline u8 rng_hwstatus_set (u8 hw_status)
-{
- assert (rng_mem != NULL);
- writeb (hw_status, rng_mem + RNG_HW_STATUS);
- return rng_hwstatus ();
-}
-
-
-static inline int rng_data_present (void)
-{
- assert (rng_mem != NULL);
-
- return (readb (rng_mem + RNG_STATUS) & RNG_DATA_PRESENT) ? 1 : 0;
-}
-
-
-static inline int rng_data_read (void)
-{
- assert (rng_mem != NULL);
-
- return readb (rng_mem + RNG_DATA);
-}
-
-/*
- * rng_enable - enable the RNG hardware
- */
-
-static int rng_enable (void)
-{
- int rc = 0;
- u8 hw_status, new_status;
-
- DPRINTK ("ENTER\n");
-
- hw_status = rng_hwstatus ();
-
- if ((hw_status & RNG_ENABLED) == 0) {
- new_status = rng_hwstatus_set (hw_status | RNG_ENABLED);
-
- if (new_status & RNG_ENABLED)
- printk (KERN_INFO PFX "RNG h/w enabled\n");
- else {
- printk (KERN_ERR PFX "Unable to enable the RNG\n");
- rc = -EIO;
- }
- }
-
- DPRINTK ("EXIT, returning %d\n", rc);
- return rc;
-}
-
-/*
- * rng_disable - disable the RNG hardware
- */
-
-static void rng_disable(void)
-{
- u8 hw_status, new_status;
-
- DPRINTK ("ENTER\n");
-
- hw_status = rng_hwstatus ();
-
- if (hw_status & RNG_ENABLED) {
- new_status = rng_hwstatus_set (hw_status & ~RNG_ENABLED);
-
- if ((new_status & RNG_ENABLED) == 0)
- printk (KERN_INFO PFX "RNG h/w disabled\n");
- else {
- printk (KERN_ERR PFX "Unable to disable the RNG\n");
- }
- }
-
- DPRINTK ("EXIT\n");
-}
-
-static int rng_dev_open (struct inode *inode, struct file *filp)
-{
- int rc;
-
- if ((filp->f_mode & FMODE_READ) == 0)
- return -EINVAL;
- if (filp->f_mode & FMODE_WRITE)
- return -EINVAL;
-
- /* wait for device to become free */
- if (filp->f_flags & O_NONBLOCK) {
- if (down_trylock (&rng_open_sem))
- return -EAGAIN;
- } else {
- if (down_interruptible (&rng_open_sem))
- return -ERESTARTSYS;
- }
-
- rc = rng_enable ();
- if (rc) {
- up (&rng_open_sem);
- return rc;
- }
-
- return 0;
-}
-
-
-static int rng_dev_release (struct inode *inode, struct file *filp)
-{
- rng_disable ();
- up (&rng_open_sem);
- return 0;
-}
-
-
-static ssize_t rng_dev_read (struct file *filp, char *buf, size_t size,
- loff_t * offp)
-{
- static spinlock_t rng_lock = SPIN_LOCK_UNLOCKED;
- int have_data;
- u8 data = 0;
- ssize_t ret = 0;
-
- while (size) {
- spin_lock (&rng_lock);
-
- have_data = 0;
- if (rng_data_present ()) {
- data = rng_data_read ();
- have_data = 1;
- }
-
- spin_unlock (&rng_lock);
-
- if (have_data) {
- if (put_user (data, buf++)) {
- ret = ret ? : -EFAULT;
- break;
- }
- size--;
- ret++;
- }
-
- if (filp->f_flags & O_NONBLOCK)
- return ret ? : -EAGAIN;
-
- if (need_resched())
- {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(1);
- }
- else
- udelay(200);
-
- if (signal_pending (current))
- return ret ? : -ERESTARTSYS;
- }
-
- return ret;
-}
-
-
-static struct file_operations rng_chrdev_ops = {
- .owner = THIS_MODULE,
- .open = rng_dev_open,
- .release = rng_dev_release,
- .read = rng_dev_read,
-};
-
-
-static struct miscdevice rng_miscdev = {
- RNG_MISCDEV_MINOR,
- RNG_MODULE_NAME,
- &rng_chrdev_ops,
-};
-
-
-/*
- * rng_init_one - look for and attempt to init a single RNG
- */
-static int __init rng_init_one (struct pci_dev *dev)
-{
- int rc;
- u8 hw_status;
-
- DPRINTK ("ENTER\n");
-
- rc = misc_register (&rng_miscdev);
- if (rc) {
- printk (KERN_ERR PFX "cannot register misc device\n");
- DPRINTK ("EXIT, returning %d\n", rc);
- goto err_out;
- }
-
- rng_mem = ioremap (RNG_ADDR, RNG_ADDR_LEN);
- if (rng_mem == NULL) {
- printk (KERN_ERR PFX "cannot ioremap RNG Memory\n");
- DPRINTK ("EXIT, returning -EBUSY\n");
- rc = -EBUSY;
- goto err_out_free_miscdev;
- }
-
- /* Check for Intel 82802 */
- hw_status = rng_hwstatus ();
- if ((hw_status & RNG_PRESENT) == 0) {
- printk (KERN_ERR PFX "RNG not detected\n");
- DPRINTK ("EXIT, returning -ENODEV\n");
- rc = -ENODEV;
- goto err_out_free_map;
- }
-
- /* turn RNG h/w off, if it's on */
- if (hw_status & RNG_ENABLED)
- hw_status = rng_hwstatus_set (hw_status & ~RNG_ENABLED);
- if (hw_status & RNG_ENABLED) {
- printk (KERN_ERR PFX "cannot disable RNG, aborting\n");
- goto err_out_free_map;
- }
-
- DPRINTK ("EXIT, returning 0\n");
- return 0;
-
-err_out_free_map:
- iounmap (rng_mem);
-err_out_free_miscdev:
- misc_deregister (&rng_miscdev);
-err_out:
- return rc;
-}
-
-
-/*
- * Data for PCI driver interface
- *
- * This data only exists for exporting the supported
- * PCI ids via MODULE_DEVICE_TABLE. We do not actually
- * register a pci_driver, because someone else might one day
- * want to register another driver on the same PCI id.
- */
-static struct pci_device_id rng_pci_tbl[] __initdata = {
- { 0x8086, 0x2418, PCI_ANY_ID, PCI_ANY_ID, },
- { 0x8086, 0x2428, PCI_ANY_ID, PCI_ANY_ID, },
- { 0x8086, 0x2448, PCI_ANY_ID, PCI_ANY_ID, },
- { 0x8086, 0x244e, PCI_ANY_ID, PCI_ANY_ID, },
- { 0x8086, 0x245e, PCI_ANY_ID, PCI_ANY_ID, },
- { 0, },
-};
-MODULE_DEVICE_TABLE (pci, rng_pci_tbl);
-
-
-MODULE_AUTHOR("Jeff Garzik, Philipp Rumpf, Matt Sottek");
-MODULE_DESCRIPTION("Intel i8xx chipset Random Number Generator (RNG) driver");
-MODULE_LICENSE("GPL");
-
-
-/*
- * rng_init - initialize RNG module
- */
-static int __init rng_init (void)
-{
- int rc;
- struct pci_dev *pdev;
-
- DPRINTK ("ENTER\n");
-
- init_MUTEX (&rng_open_sem);
-
- pci_for_each_dev(pdev) {
- if (pci_match_device (rng_pci_tbl, pdev) != NULL)
- goto match;
- }
-
- DPRINTK ("EXIT, returning -ENODEV\n");
- return -ENODEV;
-
-match:
- rc = rng_init_one (pdev);
- if (rc)
- return rc;
-
- printk (KERN_INFO RNG_DRIVER_NAME " loaded\n");
-
- DPRINTK ("EXIT, returning 0\n");
- return 0;
-}
-
-
-/*
- * rng_init - shutdown RNG module
- */
-static void __exit rng_cleanup (void)
-{
- DPRINTK ("ENTER\n");
-
- misc_deregister (&rng_miscdev);
-
- iounmap (rng_mem);
-
- DPRINTK ("EXIT\n");
-}
-
-
-module_init (rng_init);
-module_exit (rng_cleanup);
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