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3eb9473e | 1 | /*++\r |
2 | \r | |
2c7e5c2f HT |
3 | Copyright (c) 2004 - 2006, Intel Corporation. All rights reserved.<BR>\r |
4 | This program and the accompanying materials \r | |
3eb9473e | 5 | are licensed and made available under the terms and conditions of the BSD License \r |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | \r | |
13 | Module Name:\r | |
14 | \r | |
15 | InternalSwitchStack.c\r | |
16 | \r | |
17 | Abstract: \r | |
18 | \r | |
19 | SwitchStack() function for IA-32.\r | |
20 | \r | |
21 | --*/\r | |
22 | \r | |
c7f33ca4 | 23 | #include "BaseLibInternals.h"\r |
3eb9473e | 24 | \r |
25 | /**\r | |
26 | Transfers control to a function starting with a new stack.\r | |
27 | \r | |
28 | Transfers control to the function specified by EntryPoint using the new stack\r | |
29 | specified by NewStack and passing in the parameters specified by Context1 and\r | |
c7f33ca4 | 30 | by Context1 and Context2. Context1 and Context2 are optional and may\r |
31 | be NULL. The function EntryPoint must never return.\r | |
32 | Marker will be ignored on IA-32, x64, and EBC.\r | |
33 | IPF CPUs expect one additional parameter of type VOID * that specifies\r | |
34 | the new backing store pointer.\r | |
35 | \r | |
36 | If EntryPoint is NULL, then ASSERT().\r | |
37 | If NewStack is NULL, then ASSERT().\r | |
3eb9473e | 38 | \r |
39 | @param EntryPoint A pointer to function to call with the new stack.\r | |
40 | @param Context1 A pointer to the context to pass into the EntryPoint\r | |
41 | function.\r | |
42 | @param Context2 A pointer to the context to pass into the EntryPoint\r | |
43 | function.\r | |
44 | @param NewStack A pointer to the new stack to use for the EntryPoint\r | |
45 | function.\r | |
c7f33ca4 | 46 | @param Marker VA_LIST marker for the variable argument list.\r |
3eb9473e | 47 | \r |
48 | **/\r | |
49 | VOID\r | |
50 | EFIAPI\r | |
51 | InternalSwitchStack (\r | |
52 | IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
c7f33ca4 | 53 | IN VOID *Context1, OPTIONAL\r |
54 | IN VOID *Context2, OPTIONAL\r | |
55 | IN VOID *NewStack,\r | |
56 | IN VA_LIST Marker\r | |
3eb9473e | 57 | )\r |
58 | {\r | |
59 | BASE_LIBRARY_JUMP_BUFFER JumpBuffer;\r | |
60 | \r | |
c7f33ca4 | 61 | //\r |
62 | // Stack should be aligned with CPU_STACK_ALIGNMENT\r | |
63 | //\r | |
64 | ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);\r | |
65 | \r | |
3eb9473e | 66 | JumpBuffer.Eip = (UINTN)EntryPoint;\r |
67 | JumpBuffer.Esp = (UINTN)NewStack - sizeof (VOID*);\r | |
68 | JumpBuffer.Esp -= sizeof (Context1) + sizeof (Context2);\r | |
69 | ((VOID**)JumpBuffer.Esp)[1] = Context1;\r | |
70 | ((VOID**)JumpBuffer.Esp)[2] = Context2;\r | |
71 | \r | |
72 | LongJump (&JumpBuffer, (UINTN)-1);\r | |
73 | }\r |