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, 246 insertions, 0 deletions

diff --git a/arch/i386/kernel/cpuid.c b/arch/i386/kernel/cpuid.c
new file mode 100644
index 000000000000..2e2756345bb2
--- /dev/null
+++ b/arch/i386/kernel/cpuid.c
@@ -0,0 +1,246 @@
+/* ----------------------------------------------------------------------- *
+ *   
+ *   Copyright 2000 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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * cpuid.c
+ *
+ * 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.
+ *
+ * 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/config.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/smp_lock.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/cpu.h>
+#include <linux/notifier.h>
+
+#include <asm/processor.h>
+#include <asm/msr.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+static struct class_simple *cpuid_class;
+
+#ifdef CONFIG_SMP
+
+struct cpuid_command {
+	int cpu;
+	u32 reg;
+	u32 *data;
+};
+
+static void cpuid_smp_cpuid(void *cmd_block)
+{
+	struct cpuid_command *cmd = (struct cpuid_command *)cmd_block;
+
+	if (cmd->cpu == smp_processor_id())
+		cpuid(cmd->reg, &cmd->data[0], &cmd->data[1], &cmd->data[2],
+		      &cmd->data[3]);
+}
+
+static inline void do_cpuid(int cpu, u32 reg, u32 * data)
+{
+	struct cpuid_command cmd;
+
+	preempt_disable();
+	if (cpu == smp_processor_id()) {
+		cpuid(reg, &data[0], &data[1], &data[2], &data[3]);
+	} else {
+		cmd.cpu = cpu;
+		cmd.reg = reg;
+		cmd.data = data;
+
+		smp_call_function(cpuid_smp_cpuid, &cmd, 1, 1);
+	}
+	preempt_enable();
+}
+#else				/* ! CONFIG_SMP */
+
+static inline void do_cpuid(int cpu, u32 reg, u32 * data)
+{
+	cpuid(reg, &data[0], &data[1], &data[2], &data[3]);
+}
+
+#endif				/* ! CONFIG_SMP */
+
+static loff_t cpuid_seek(struct file *file, loff_t offset, int orig)
+{
+	loff_t ret;
+
+	lock_kernel();
+
+	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;
+	}
+
+	unlock_kernel();
+	return ret;
+}
+
+static ssize_t cpuid_read(struct file *file, char __user *buf,
+			  size_t count, loff_t * ppos)
+{
+	char __user *tmp = buf;
+	u32 data[4];
+	size_t rv;
+	u32 reg = *ppos;
+	int cpu = iminor(file->f_dentry->d_inode);
+
+	if (count % 16)
+		return -EINVAL;	/* Invalid chunk size */
+
+	for (rv = 0; count; count -= 16) {
+		do_cpuid(cpu, reg, data);
+		if (copy_to_user(tmp, &data, 16))
+			return -EFAULT;
+		tmp += 16;
+		*ppos = reg++;
+	}
+
+	return tmp - buf;
+}
+
+static int cpuid_open(struct inode *inode, struct file *file)
+{
+	unsigned int cpu = iminor(file->f_dentry->d_inode);
+	struct cpuinfo_x86 *c = &(cpu_data)[cpu];
+
+	if (cpu >= NR_CPUS || !cpu_online(cpu))
+		return -ENXIO;	/* No such CPU */
+	if (c->cpuid_level < 0)
+		return -EIO;	/* CPUID not supported */
+
+	return 0;
+}
+
+/*
+ * File operations we support
+ */
+static struct file_operations cpuid_fops = {
+	.owner = THIS_MODULE,
+	.llseek = cpuid_seek,
+	.read = cpuid_read,
+	.open = cpuid_open,
+};
+
+static int cpuid_class_simple_device_add(int i) 
+{
+	int err = 0;
+	struct class_device *class_err;
+
+	class_err = class_simple_device_add(cpuid_class, MKDEV(CPUID_MAJOR, i), NULL, "cpu%d",i);
+	if (IS_ERR(class_err))
+		err = PTR_ERR(class_err);
+	return err;
+}
+
+static int __devinit cpuid_class_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+	unsigned int cpu = (unsigned long)hcpu;
+
+	switch (action) {
+	case CPU_ONLINE:
+		cpuid_class_simple_device_add(cpu);
+		break;
+	case CPU_DEAD:
+		class_simple_device_remove(MKDEV(CPUID_MAJOR, cpu));
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block cpuid_class_cpu_notifier =
+{
+	.notifier_call = cpuid_class_cpu_callback,
+};
+
+static int __init cpuid_init(void)
+{
+	int i, err = 0;
+	i = 0;
+
+	if (register_chrdev(CPUID_MAJOR, "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_simple_create(THIS_MODULE, "cpuid");
+	if (IS_ERR(cpuid_class)) {
+		err = PTR_ERR(cpuid_class);
+		goto out_chrdev;
+	}
+	for_each_online_cpu(i) {
+		err = cpuid_class_simple_device_add(i);
+		if (err != 0) 
+			goto out_class;
+	}
+	register_cpu_notifier(&cpuid_class_cpu_notifier);
+
+	err = 0;
+	goto out;
+
+out_class:
+	i = 0;
+	for_each_online_cpu(i) {
+		class_simple_device_remove(MKDEV(CPUID_MAJOR, i));
+	}
+	class_simple_destroy(cpuid_class);
+out_chrdev:
+	unregister_chrdev(CPUID_MAJOR, "cpu/cpuid");	
+out:
+	return err;
+}
+
+static void __exit cpuid_exit(void)
+{
+	int cpu = 0;
+
+	for_each_online_cpu(cpu)
+		class_simple_device_remove(MKDEV(CPUID_MAJOR, cpu));
+	class_simple_destroy(cpuid_class);
+	unregister_chrdev(CPUID_MAJOR, "cpu/cpuid");
+	unregister_cpu_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");