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f1baef62 | 1 | /** @file\r |
2 | SwitchStack() function for IPF.\r | |
3 | \r | |
4 | Copyright (c) 2007, Intel Corporation<BR>\r | |
5 | All rights reserved. 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 | Module Name: InternalSwitchStack.c\r | |
14 | \r | |
15 | **/\r | |
16 | \r | |
17 | #include <BaseLibInternals.h>\r | |
18 | \r | |
19 | /** | |
20 | Transfers control to a function starting with a new stack. | |
21 | ||
22 | Transfers control to the function specified by EntryPoint using the | |
23 | new stack specified by NewStack and passing in the parameters specified | |
24 | by Context1 and Context2. Context1 and Context2 are optional and may | |
25 | be NULL. The function EntryPoint must never return. | |
26 | Marker will be ignored on IA-32, x64, and EBC. | |
27 | IPF CPUs expect one additional parameter of type VOID * that specifies | |
28 | the new backing store pointer.\r | |
29 | ||
30 | If EntryPoint is NULL, then ASSERT().\r | |
31 | If NewStack is NULL, then ASSERT().\r | |
32 | ||
33 | @param EntryPoint A pointer to function to call with the new stack. | |
34 | @param Context1 A pointer to the context to pass into the EntryPoint | |
35 | function. | |
36 | @param Context2 A pointer to the context to pass into the EntryPoint | |
37 | function. | |
38 | @param NewStack A pointer to the new stack to use for the EntryPoint | |
39 | function.\r | |
40 | @param Marker VA_LIST marker for the variable argument list. | |
41 | ||
42 | **/\r | |
43 | VOID | |
44 | EFIAPI | |
45 | InternalSwitchStack ( | |
46 | IN SWITCH_STACK_ENTRY_POINT EntryPoint, | |
47 | IN VOID *Context1, OPTIONAL | |
48 | IN VOID *Context2, OPTIONAL | |
49 | IN VOID *NewStack, | |
50 | IN VA_LIST Marker | |
51 | )\r | |
52 | \r | |
53 | {\r | |
54 | VOID *NewBsp;\r | |
55 | \r | |
56 | //\r | |
57 | // Get new backing store pointer from variable list\r | |
58 | //\r | |
59 | NewBsp = VA_ARG (Marker, VOID *);\r | |
60 | \r | |
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 | ASSERT (((UINTN)NewBsp & (CPU_STACK_ALIGNMENT - 1)) == 0);\r | |
66 | \r | |
67 | AsmSwitchStackAndBackingStore (EntryPoint, Context1, Context2, NewStack, NewBsp);\r | |
68 | }\r |