markers-test/cachectl.c

   1 #include <linux/kernel.h>
   2 #include <linux/module.h>
   3
   4 int init_module()
   5 {
   6   unsigned tmp;
   7
   8   /* Disable cache */
   9
  10   asm volatile ("movl  %%cr0, %0\n\t"
  11                 "orl   $0x40000000, %0\n\t"
  12                 "wbinvd\n\t"
  13                 "movl  %0, %%cr0\n\t"
  14                 "wbinvd\n\t"
  15                 : "=r" (tmp) : : "memory");
  16
  17   return 0;
  18 }
  19
  20 void cleanup_module()
  21 {
  22   unsigned tmp;
  23
  24   asm volatile ("movl  %%cr0, %0\n\t"
  25                 "andl   $0xbfffffff, %0\n\t"
  26                 "wbinvd\n\t"
  27                 "movl  %0, %%cr0\n\t"
  28                 "wbinvd\n\t"
  29                 : "=r" (tmp) : : "memory");
  30 }