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study/kernel/02-memory/00-code/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

study/kernel/02-memory/00-code/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);