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e1f414b6 | 1 | /** @file\r |
2 | Switch Stack functions.\r | |
3 | \r | |
9095d37b | 4 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
9344f092 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
e1f414b6 | 6 | \r |
e1f414b6 | 7 | **/\r |
8 | \r | |
47fc17d8 | 9 | #include "BaseLibInternals.h"\r |
e1f414b6 | 10 | \r |
11 | /**\r | |
12 | Transfers control to a function starting with a new stack.\r | |
13 | \r | |
14 | Transfers control to the function specified by EntryPoint using the\r | |
15 | new stack specified by NewStack and passing in the parameters specified\r | |
16 | by Context1 and Context2. Context1 and Context2 are optional and may\r | |
17 | be NULL. The function EntryPoint must never return. This function\r | |
18 | supports a variable number of arguments following the NewStack parameter.\r | |
19 | These additional arguments are ignored on IA-32, x64, and EBC.\r | |
20 | IPF CPUs expect one additional parameter of type VOID * that specifies\r | |
21 | the new backing store pointer.\r | |
22 | \r | |
23 | If EntryPoint is NULL, then ASSERT().\r | |
24 | If NewStack is NULL, then ASSERT().\r | |
25 | \r | |
26 | @param EntryPoint A pointer to function to call with the new stack.\r | |
27 | @param Context1 A pointer to the context to pass into the EntryPoint\r | |
28 | function.\r | |
29 | @param Context2 A pointer to the context to pass into the EntryPoint\r | |
30 | function.\r | |
31 | @param NewStack A pointer to the new stack to use for the EntryPoint\r | |
32 | function.\r | |
9095d37b LG |
33 | @param ... This variable argument list is ignored for IA32, x64, and EBC.\r |
34 | For IPF, this variable argument list is expected to contain\r | |
35 | a single parameter of type VOID * that specifies the new backing\r | |
285010e7 | 36 | store pointer.\r |
e1f414b6 | 37 | \r |
2fc60b70 | 38 | \r |
e1f414b6 | 39 | **/\r |
40 | VOID\r | |
41 | EFIAPI\r | |
42 | SwitchStack (\r | |
43 | IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
d0e2f823 MK |
44 | IN VOID *Context1 OPTIONAL,\r |
45 | IN VOID *Context2 OPTIONAL,\r | |
e1f414b6 | 46 | IN VOID *NewStack,\r |
47 | ...\r | |
48 | )\r | |
49 | {\r | |
50 | VA_LIST Marker;\r | |
51 | \r | |
52 | ASSERT (EntryPoint != NULL);\r | |
53 | ASSERT (NewStack != NULL);\r | |
54 | \r | |
7f22d351 | 55 | //\r |
56 | // New stack must be aligned with CPU_STACK_ALIGNMENT\r | |
57 | //\r | |
58 | ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);\r | |
59 | \r | |
e1f414b6 | 60 | VA_START (Marker, NewStack);\r |
61 | \r | |
62 | InternalSwitchStack (EntryPoint, Context1, Context2, NewStack, Marker);\r | |
63 | \r | |
7f22d351 | 64 | VA_END (Marker);\r |
65 | \r | |
e1f414b6 | 66 | //\r |
67 | // InternalSwitchStack () will never return\r | |
68 | //\r | |
69 | ASSERT (FALSE);\r | |
70 | }\r |