MdePkg/Library/BaseLib/X64/Non-existing.c

   1 /** @file
   2   Non-existing BaseLib functions on x64
   3
   4   Copyright (c) 2006, Intel Corporation
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13   Module Name:  Non-existing.c
  14
  15 **/
  16
  17 #include "../BaseLibInternals.h"
  18
  19 /**
  20   Enables the 32-bit paging mode on the CPU.
  21
  22   Enables the 32-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables
  23   must be properly initialized prior to calling this service. This function
  24   assumes the current execution mode is 32-bit protected mode. This function is
  25   only available on IA-32. After the 32-bit paging mode is enabled, control is
  26   transferred to the function specified by EntryPoint using the new stack
  27   specified by NewStack and passing in the parameters specified by Context1 and
  28   Context2. Context1 and Context2 are optional and may be NULL. The function
  29   EntryPoint must never return.
  30
  31   There are a number of constraints that must be followed before calling this
  32   function:
  33   1)  Interrupts must be disabled.
  34   2)  The caller must be in 32-bit protected mode with flat descriptors. This
  35       means all descriptors must have a base of 0 and a limit of 4GB.
  36   3)  CR0 and CR4 must be compatible with 32-bit protected mode with flat
  37       descriptors.
  38   4)  CR3 must point to valid page tables that will be used once the transition
  39       is complete, and those page tables must guarantee that the pages for this
  40       function and the stack are identity mapped.
  41
  42   @param  EntryPoint  A pointer to function to call with the new stack after
  43                       paging is enabled.
  44   @param  Context1    A pointer to the context to pass into the EntryPoint
  45                       function as the first parameter after paging is enabled.
  46   @param  Context2    A pointer to the context to pass into the EntryPoint
  47                       function as the second parameter after paging is enabled.
  48   @param  NewStack    A pointer to the new stack to use for the EntryPoint
  49                       function after paging is enabled.
  50
  51 **/
  52 VOID
  53 EFIAPI
  54 InternalX86EnablePaging32 (
  55   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  56   IN      VOID                      *Context1,  OPTIONAL
  57   IN      VOID                      *Context2,  OPTIONAL
  58   IN      VOID                      *NewStack
  59   )
  60 {
  61   //
  62   // This function cannot work on X64 platform
  63   //
  64   ASSERT (FALSE);
  65 }
  66
  67 /**
  68   Disables the 32-bit paging mode on the CPU.
  69
  70   Disables the 32-bit paging mode on the CPU and returns to 32-bit protected
  71   mode. This function assumes the current execution mode is 32-paged protected
  72   mode. This function is only available on IA-32. After the 32-bit paging mode
  73   is disabled, control is transferred to the function specified by EntryPoint
  74   using the new stack specified by NewStack and passing in the parameters
  75   specified by Context1 and Context2. Context1 and Context2 are optional and
  76   may be NULL. The function EntryPoint must never return.
  77
  78   There are a number of constraints that must be followed before calling this
  79   function:
  80   1)  Interrupts must be disabled.
  81   2)  The caller must be in 32-bit paged mode.
  82   3)  CR0, CR3, and CR4 must be compatible with 32-bit paged mode.
  83   4)  CR3 must point to valid page tables that guarantee that the pages for
  84       this function and the stack are identity mapped.
  85
  86   @param  EntryPoint  A pointer to function to call with the new stack after
  87                       paging is disabled.
  88   @param  Context1    A pointer to the context to pass into the EntryPoint
  89                       function as the first parameter after paging is disabled.
  90   @param  Context2    A pointer to the context to pass into the EntryPoint
  91                       function as the second parameter after paging is
  92                       disabled.
  93   @param  NewStack    A pointer to the new stack to use for the EntryPoint
  94                       function after paging is disabled.
  95
  96 **/
  97 VOID
  98 EFIAPI
  99 InternalX86DisablePaging32 (
 100   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
 101   IN      VOID                      *Context1,  OPTIONAL
 102   IN      VOID                      *Context2,  OPTIONAL
 103   IN      VOID                      *NewStack
 104   )
 105 {
 106   //
 107   // This function cannot work on X64 platform
 108   //
 109   ASSERT (FALSE);
 110 }