projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 79e4f2a5 RN |
1 | /*++\r |
| 2 | \r | |
| 3 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r | |
| 4 | Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
| 5 | This program and the accompanying materials\r | |
| 6 | are licensed and made available under the terms and conditions of the BSD License\r | |
| 7 | which accompanies this distribution. The full text of the license may be found at\r | |
| 8 | http://opensource.org/licenses/bsd-license.php\r | |
| 9 | \r | |
| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 12 | \r | |
| 13 | \r | |
| 14 | --*/\r | |
| 15 | \r | |
| 16 | #include "Host.h"\r | |
| 17 | \r | |
| 18 | \r | |
| 19 | /**\r | |
| 20 | Transfers control to a function starting with a new stack.\r | |
| 21 | \r | |
| 22 | Transfers control to the function specified by EntryPoint using the new stack\r | |
| 23 | specified by NewStack and passing in the parameters specified by Context1 and\r | |
| 24 | Context2. Context1 and Context2 are optional and may be NULL. The function\r | |
| 25 | EntryPoint must never return.\r | |
| 26 | \r | |
| 27 | If EntryPoint is NULL, then ASSERT().\r | |
| 28 | If NewStack is NULL, then ASSERT().\r | |
| 29 | \r | |
| 30 | @param EntryPoint A pointer to function to call with the new stack.\r | |
| 31 | @param Context1 A pointer to the context to pass into the EntryPoint\r | |
| 32 | function.\r | |
| 33 | @param Context2 A pointer to the context to pass into the EntryPoint\r | |
| 34 | function.\r | |
| 35 | @param NewStack A pointer to the new stack to use for the EntryPoint\r | |
| 36 | function.\r | |
| 37 | \r | |
| 38 | **/\r | |
| 39 | VOID\r | |
| 40 | EFIAPI\r | |
| 41 | PeiSwitchStacks (\r | |
| 42 | IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
| 43 | IN VOID *Context1, OPTIONAL\r | |
| 44 | IN VOID *Context2, OPTIONAL\r | |
| 45 | IN VOID *NewStack\r | |
| 46 | )\r | |
| 47 | {\r | |
| 48 | BASE_LIBRARY_JUMP_BUFFER JumpBuffer;\r | |
| 49 | \r | |
| 50 | ASSERT (EntryPoint != NULL);\r | |
| 51 | ASSERT (NewStack != NULL);\r | |
| 52 | \r | |
| 53 | //\r | |
| 54 | // Stack should be aligned with CPU_STACK_ALIGNMENT\r | |
| 55 | //\r | |
| 56 | ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);\r | |
| 57 | \r | |
| 58 | JumpBuffer.Eip = (UINTN)EntryPoint;\r | |
| 59 | JumpBuffer.Esp = (UINTN)NewStack - sizeof (VOID*);\r | |
| 60 | JumpBuffer.Esp -= sizeof (Context1) + sizeof (Context2);\r | |
| 61 | ((VOID**)JumpBuffer.Esp)[1] = Context1;\r | |
| 62 | ((VOID**)JumpBuffer.Esp)[2] = Context2;\r | |
| 63 | \r | |
| 64 | LongJump (&JumpBuffer, (UINTN)-1);\r | |
| 65 | \r | |
| 66 | \r | |
| 67 | //\r | |
| 68 | // PeiSwitchStacks () will never return\r | |
| 69 | //\r | |
| 70 | ASSERT (FALSE);\r | |
| 71 | }\r | |
| 72 | \r | |
| 73 | \r | |
| 74 | \r |