diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/kernel/cpuid.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/kernel/cpuid.c | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/ANDROID_3.4.5/arch/x86/kernel/cpuid.c b/ANDROID_3.4.5/arch/x86/kernel/cpuid.c deleted file mode 100644 index 39472dd2..00000000 --- a/ANDROID_3.4.5/arch/x86/kernel/cpuid.c +++ /dev/null @@ -1,240 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 2000-2008 H. Peter Anvin - 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, Inc., 675 Mass Ave, Cambridge MA 02139, - * USA; either version 2 of the License, or (at your option) any later - * version; incorporated herein by reference. - * - * ----------------------------------------------------------------------- */ - -/* - * x86 CPUID access device - * - * This device is accessed by lseek() to the appropriate CPUID level - * and then read in chunks of 16 bytes. A larger size means multiple - * reads of consecutive levels. - * - * The lower 32 bits of the file position is used as the incoming %eax, - * and the upper 32 bits of the file position as the incoming %ecx, - * the latter intended for "counting" eax levels like eax=4. - * - * This driver uses /dev/cpu/%d/cpuid where %d is the minor number, and on - * an SMP box will direct the access to CPU %d. - */ - -#include <linux/module.h> - -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/fcntl.h> -#include <linux/init.h> -#include <linux/poll.h> -#include <linux/smp.h> -#include <linux/major.h> -#include <linux/fs.h> -#include <linux/device.h> -#include <linux/cpu.h> -#include <linux/notifier.h> -#include <linux/uaccess.h> -#include <linux/gfp.h> - -#include <asm/processor.h> -#include <asm/msr.h> - -static struct class *cpuid_class; - -struct cpuid_regs { - u32 eax, ebx, ecx, edx; -}; - -static void cpuid_smp_cpuid(void *cmd_block) -{ - struct cpuid_regs *cmd = (struct cpuid_regs *)cmd_block; - - cpuid_count(cmd->eax, cmd->ecx, - &cmd->eax, &cmd->ebx, &cmd->ecx, &cmd->edx); -} - -static loff_t cpuid_seek(struct file *file, loff_t offset, int orig) -{ - loff_t ret; - struct inode *inode = file->f_mapping->host; - - mutex_lock(&inode->i_mutex); - switch (orig) { - case 0: - file->f_pos = offset; - ret = file->f_pos; - break; - case 1: - file->f_pos += offset; - ret = file->f_pos; - break; - default: - ret = -EINVAL; - } - mutex_unlock(&inode->i_mutex); - return ret; -} - -static ssize_t cpuid_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos) -{ - char __user *tmp = buf; - struct cpuid_regs cmd; - int cpu = iminor(file->f_path.dentry->d_inode); - u64 pos = *ppos; - ssize_t bytes = 0; - int err = 0; - - if (count % 16) - return -EINVAL; /* Invalid chunk size */ - - for (; count; count -= 16) { - cmd.eax = pos; - cmd.ecx = pos >> 32; - err = smp_call_function_single(cpu, cpuid_smp_cpuid, &cmd, 1); - if (err) - break; - if (copy_to_user(tmp, &cmd, 16)) { - err = -EFAULT; - break; - } - tmp += 16; - bytes += 16; - *ppos = ++pos; - } - - return bytes ? bytes : err; -} - -static int cpuid_open(struct inode *inode, struct file *file) -{ - unsigned int cpu; - struct cpuinfo_x86 *c; - - cpu = iminor(file->f_path.dentry->d_inode); - if (cpu >= nr_cpu_ids || !cpu_online(cpu)) - return -ENXIO; /* No such CPU */ - - c = &cpu_data(cpu); - if (c->cpuid_level < 0) - return -EIO; /* CPUID not supported */ - - return 0; -} - -/* - * File operations we support - */ -static const struct file_operations cpuid_fops = { - .owner = THIS_MODULE, - .llseek = cpuid_seek, - .read = cpuid_read, - .open = cpuid_open, -}; - -static __cpuinit int cpuid_device_create(int cpu) -{ - struct device *dev; - - dev = device_create(cpuid_class, NULL, MKDEV(CPUID_MAJOR, cpu), NULL, - "cpu%d", cpu); - return IS_ERR(dev) ? PTR_ERR(dev) : 0; -} - -static void cpuid_device_destroy(int cpu) -{ - device_destroy(cpuid_class, MKDEV(CPUID_MAJOR, cpu)); -} - -static int __cpuinit cpuid_class_cpu_callback(struct notifier_block *nfb, - unsigned long action, - void *hcpu) -{ - unsigned int cpu = (unsigned long)hcpu; - int err = 0; - - switch (action) { - case CPU_UP_PREPARE: - err = cpuid_device_create(cpu); - break; - case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: - case CPU_DEAD: - cpuid_device_destroy(cpu); - break; - } - return notifier_from_errno(err); -} - -static struct notifier_block __refdata cpuid_class_cpu_notifier = -{ - .notifier_call = cpuid_class_cpu_callback, -}; - -static char *cpuid_devnode(struct device *dev, umode_t *mode) -{ - return kasprintf(GFP_KERNEL, "cpu/%u/cpuid", MINOR(dev->devt)); -} - -static int __init cpuid_init(void) -{ - int i, err = 0; - i = 0; - - if (__register_chrdev(CPUID_MAJOR, 0, NR_CPUS, - "cpu/cpuid", &cpuid_fops)) { - printk(KERN_ERR "cpuid: unable to get major %d for cpuid\n", - CPUID_MAJOR); - err = -EBUSY; - goto out; - } - cpuid_class = class_create(THIS_MODULE, "cpuid"); - if (IS_ERR(cpuid_class)) { - err = PTR_ERR(cpuid_class); - goto out_chrdev; - } - cpuid_class->devnode = cpuid_devnode; - for_each_online_cpu(i) { - err = cpuid_device_create(i); - if (err != 0) - goto out_class; - } - register_hotcpu_notifier(&cpuid_class_cpu_notifier); - - err = 0; - goto out; - -out_class: - i = 0; - for_each_online_cpu(i) { - cpuid_device_destroy(i); - } - class_destroy(cpuid_class); -out_chrdev: - __unregister_chrdev(CPUID_MAJOR, 0, NR_CPUS, "cpu/cpuid"); -out: - return err; -} - -static void __exit cpuid_exit(void) -{ - int cpu = 0; - - for_each_online_cpu(cpu) - cpuid_device_destroy(cpu); - class_destroy(cpuid_class); - __unregister_chrdev(CPUID_MAJOR, 0, NR_CPUS, "cpu/cpuid"); - unregister_hotcpu_notifier(&cpuid_class_cpu_notifier); -} - -module_init(cpuid_init); -module_exit(cpuid_exit); - -MODULE_AUTHOR("H. Peter Anvin <hpa@zytor.com>"); -MODULE_DESCRIPTION("x86 generic CPUID driver"); -MODULE_LICENSE("GPL"); |