lib/test_debug_virtual.c

   1 #include <linux/kernel.h>
   2 #include <linux/module.h>
   3 #include <linux/export.h>
   4 #include <linux/mm.h>
   5 #include <linux/vmalloc.h>
   6 #include <linux/slab.h>
   7 #include <linux/sizes.h>
   8 #include <linux/io.h>
   9
  10 #include <asm/page.h>
  11 #ifdef CONFIG_MIPS
  12 #include <asm/bootinfo.h>
  13 #endif
  14
  15 struct foo {
  16         unsigned int bar;
  17 };
  18
  19 struct foo *foo;
  20
  21 static int __init test_debug_virtual_init(void)
  22 {
  23         phys_addr_t pa;
  24         void *va;
  25
  26         va = (void *)VMALLOC_START;
  27         pa = virt_to_phys(va);
  28
  29         pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
  30
  31         foo = kzalloc(sizeof(*foo), GFP_KERNEL);
  32         if (!foo)
  33                 return -ENOMEM;
  34
  35         pa = virt_to_phys(foo);
  36         va = foo;
  37         pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
  38
  39         return 0;
  40 }
  41 module_init(test_debug_virtual_init);
  42
  43 static void __exit test_debug_virtual_exit(void)
  44 {
  45         kfree(foo);
  46 }
  47 module_exit(test_debug_virtual_exit);
  48
  49 MODULE_LICENSE("GPL");
  50 MODULE_DESCRIPTION("Test module for CONFIG_DEBUG_VIRTUAL");