MdeModulePkg/Core/Pei/Ipf/InternalSwitchStack.c

   1 /** @file
   2   SwitchStack() function for IPF.
   3
   4   Copyright (c) 2007, Intel Corporation<BR>
   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 **/
  14
  15 #include <PeiMain.h>
  16
  17 VOID
  18 EFIAPI
  19 IpfAsmSwitchStack (
  20     IN  SWITCH_STACK_ENTRY_POINT  EntryPoint,
  21     IN  VOID                      *ConText1, OPTIONAL
  22     IN  VOID                      *Context2, OPTIONAL
  23     IN  VOID                      *Context3, OPTIONAL
  24     IN  VOID                      *NewStack,
  25     IN  VOID                      *NewBsp
  26     );
  27
  28 /**
  29   Transfers control to a function starting with a new stack.
  30
  31   Transfers control to the function specified by EntryPoint using the
  32   new stack specified by NewStack and passing in the parameters specified
  33   by Context1 and Context2.  Context1 and Context2 are optional and may
  34   be NULL.  The function EntryPoint must never return.
  35   Marker will be ignored on IA-32, x64, and EBC.
  36   IPF CPUs expect one additional parameter of type VOID * that specifies
  37   the new backing store pointer.
  38
  39   If EntryPoint is NULL, then ASSERT().
  40   If NewStack is NULL, then ASSERT().
  41
  42   @param  EntryPoint  A pointer to function to call with the new stack.
  43   @param  Context1    A pointer to the context to pass into the EntryPoint
  44                       function.
  45   @param  Context2    A pointer to the context to pass into the EntryPoint
  46                       function.
  47   @param  NewStack    A pointer to the new stack to use for the EntryPoint
  48                       function.
  49   @param  Marker      VA_LIST marker for the variable argument list.
  50
  51 **/
  52 VOID
  53 EFIAPI
  54 InternalSwitchStack (
  55   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  56   IN      VOID                      *Context1,   OPTIONAL
  57   IN      VOID                      *Context2,   OPTIONAL
  58   IN      VOID                      *Context3,   OPTIONAL
  59   IN      VOID                      *NewStack,
  60   IN      VA_LIST                   Marker
  61   )
  62
  63 {
  64   VOID                      *NewBsp;
  65
  66   //
  67   // Get new backing store pointer from variable list
  68   //
  69   NewBsp   = VA_ARG (Marker, VOID *);
  70
  71   //
  72   // Stack should be aligned with CPU_STACK_ALIGNMENT
  73   //
  74   ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);
  75   ASSERT (((UINTN)NewBsp & (CPU_STACK_ALIGNMENT - 1)) == 0);
  76
  77   IpfAsmSwitchStack (EntryPoint, Context1, Context2, Context3, NewStack, NewBsp);
  78 }