initial commit

1 files changed, 36 insertions, 0 deletions

diff --git a/cpui-drv.c b/cpui-drv.c
new file mode 100644
index 0000000..bcb6dba
--- /dev/null
+++ b/cpui-drv.c
@@ -0,0 +1,36 @@
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+
+static int __init cpui_init(void)
+{
+	char id_str[13];
+	uint32_t eax = 0, ebx, ecx, edx;
+
+	if (!have_cpuid_p()) {
+		pr_err("CPUID instruction is NOT supported. Aborting.\n");
+		return 1;
+	}
+
+	cpuid(0, &eax, &ebx, &ecx, &edx);
+	pr_info("CPUID instruction is supported.\n");
+	pr_info("Maximum Input Value for Basic CPUID Information = %d\n", eax);
+	memcpy(&(id_str[0]), &ebx, 4);
+	memcpy(&(id_str[4]), &edx, 4);
+	memcpy(&(id_str[8]), &ecx, 4);
+	id_str[12] = '\0';
+	pr_info("Identity string = %s\n", id_str);
+	return 0;
+}
+
+static void __exit cpui_exit(void)
+{
+	pr_info("Exit complete\n");
+}
+
+module_init(cpui_init);
+module_exit(cpui_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joursoir");
+MODULE_DESCRIPTION("A driver that allows users to interact with various internal components of the CPU");
\ No newline at end of file