reactos/ntoskrnl/ke/i386/tlbflush.S

   1 /*
   2  * i386-specific implemetation of Translation Buffer Flushing
   3  * Written By: Alex Ionescu <alex@relsoft.net>
   4  * Reference: IA-32 Intel® Architecture Software Developer's Manual, Volume 3: System Programming Guide,
   5  *            Chapter 10 - Memory Cache Control. Section 10.9 - Invalidating the Translation Lookaside Buffers
   6  */
   7
   8 #include <internal/i386/ke.h>
   9
  10
  11 .globl _KeFlushCurrentTb@0
  12 _KeFlushCurrentTb@0:
  13     /* Check for global page support */
  14     testb  $0xff, (_Ke386GlobalPagesEnabled)
  15     jz     .L1
  16
  17     /* Modifying the PSE, PGE or PAE Flag in CR4 causes the TLB to be flushed */
  18     movl   %cr4, %eax
  19     andl   $~X86_CR4_PGE, %eax
  20     movl   %eax, %cr4
  21     orl    $X86_CR4_PGE, %eax
  22     movl   %eax, %cr4
  23     ret
  24
  25 .L1:
  26     /* the old way ... */
  27     movl   %cr3, %eax
  28     movl   %eax, %cr3
  29     ret