From cbfac406cd6bce20cb0468769c454dc0d2125167 Mon Sep 17 00:00:00 2001
From: gatieme <gatieme@163.com>
Date: Mon, 16 May 2016 22:14:05 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E5=AF=B9=E6=AF=94crs?=
 =?UTF-8?q?=E5=92=8Cpgd=E7=9A=84=E5=80=BC=E7=9A=84=E9=A9=B1=E5=8A=A8...?=
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---
 study/kernel/memory/cr3_pgd/Makefile  | 18 ++++++++++++++++
 study/kernel/memory/cr3_pgd/crs_pgd.c | 31 +++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 study/kernel/memory/cr3_pgd/Makefile
 create mode 100644 study/kernel/memory/cr3_pgd/crs_pgd.c

diff --git a/study/kernel/memory/cr3_pgd/Makefile b/study/kernel/memory/cr3_pgd/Makefile
new file mode 100644
index 0000000..c655fa9
--- /dev/null
+++ b/study/kernel/memory/cr3_pgd/Makefile
@@ -0,0 +1,18 @@
+ifneq ($(KERNELRELEASE),)
+
+obj-m := crs_pgd.o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+all:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+
+
+endif
diff --git a/study/kernel/memory/cr3_pgd/crs_pgd.c b/study/kernel/memory/cr3_pgd/crs_pgd.c
new file mode 100644
index 0000000..6cd2b1a
--- /dev/null
+++ b/study/kernel/memory/cr3_pgd/crs_pgd.c
@@ -0,0 +1,31 @@
+//#include <asm/system.h>
+#include <linux/mm.h>
+#include <linux/mm_types.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+
+static unsigned long read_pgd(void)
+{
+    return (unsigned long)current->mm->pgd;
+}
+
+static int __init init_cr3_pgd(void)
+{
+    unsigned long cr3;
+    unsigned long pgd = 0;
+
+    cr3 = read_cr3();
+    printk("cr3----------------->0x%lx\n",cr3);
+    pgd = __pa(read_pgd());
+    printk("pgd----------------->0x%lx\n",pgd);
+    return 0;
+}
+
+static void __exit exit_cr3_pgd(void)
+{
+    printk("--------------------->exit!\n");
+    return ;
+}
+
+module_init(init_cr3_pgd);
+module_exit(exit_cr3_pgd);