1 /** @file 2 Switch Stack functions. 3 4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 5 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 "BaseLibInternals.h" 16 17 /** 18 Transfers control to a function starting with a new stack. 19 20 Transfers control to the function specified by EntryPoint using the 21 new stack specified by NewStack and passing in the parameters specified 22 by Context1 and Context2. Context1 and Context2 are optional and may 23 be NULL. The function EntryPoint must never return. This function 24 supports a variable number of arguments following the NewStack parameter. 25 These additional arguments are ignored on IA-32, x64, and EBC. 26 IPF CPUs expect one additional parameter of type VOID * that specifies 27 the new backing store pointer. 28 29 If EntryPoint is NULL, then ASSERT(). 30 If NewStack is NULL, then ASSERT(). 31 32 @param EntryPoint A pointer to function to call with the new stack. 33 @param Context1 A pointer to the context to pass into the EntryPoint 34 function. 35 @param Context2 A pointer to the context to pass into the EntryPoint 36 function. 37 @param NewStack A pointer to the new stack to use for the EntryPoint 38 function. 39 @param ... This variable argument list is ignored for IA32, x64, and EBC. 40 For IPF, this variable argument list is expected to contain 41 a single parameter of type VOID * that specifies the new backing 42 store pointer. 43 44 45 **/ 46 VOID 47 EFIAPI 48 SwitchStack ( 49 IN SWITCH_STACK_ENTRY_POINT EntryPoint, 50 IN VOID *Context1, OPTIONAL 51 IN VOID *Context2, OPTIONAL 52 IN VOID *NewStack, 53 ... 54 ) 55 { 56 VA_LIST Marker; 57 58 ASSERT (EntryPoint != NULL); 59 ASSERT (NewStack != NULL); 60 61 // 62 // New stack must be aligned with CPU_STACK_ALIGNMENT 63 // 64 ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0); 65 66 VA_START (Marker, NewStack); 67 68 InternalSwitchStack (EntryPoint, Context1, Context2, NewStack, Marker); 69 70 VA_END (Marker); 71 72 // 73 // InternalSwitchStack () will never return 74 // 75 ASSERT (FALSE); 76 } 77
