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2939c778 EC |
1 | /** @file\r |
2 | * Exception Handling support specific for AArch64\r | |
3 | *\r | |
4 | * Copyright (c) 2016 HP Development Company, L.P.\r | |
5 | *\r | |
4059386c | 6 | * SPDX-License-Identifier: BSD-2-Clause-Patent\r |
2939c778 EC |
7 | *\r |
8 | **/\r | |
9 | \r | |
10 | #include <Uefi.h>\r | |
11 | \r | |
12 | #include <Chipset/AArch64.h>\r | |
2d120489 | 13 | #include <Library/MemoryAllocationLib.h>\r |
2939c778 EC |
14 | #include <Protocol/DebugSupport.h> // for MAX_AARCH64_EXCEPTION\r |
15 | \r | |
16 | UINTN gMaxExceptionNumber = MAX_AARCH64_EXCEPTION;\r | |
17 | EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };\r | |
18 | EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_AARCH64_EXCEPTION + 1] = { 0 };\r | |
19 | PHYSICAL_ADDRESS gExceptionVectorAlignmentMask = ARM_VECTOR_TABLE_ALIGNMENT;\r | |
20 | UINTN gDebuggerNoHandlerValue = 0; // todo: define for AArch64\r | |
21 | \r | |
2d120489 AB |
22 | #define EL0_STACK_PAGES 2\r |
23 | \r | |
24 | VOID\r | |
25 | RegisterEl0Stack (\r | |
26 | IN VOID *Stack\r | |
27 | );\r | |
28 | \r | |
2939c778 EC |
29 | RETURN_STATUS ArchVectorConfig(\r |
30 | IN UINTN VectorBaseAddress\r | |
31 | )\r | |
32 | {\r | |
33 | UINTN HcrReg;\r | |
2d120489 AB |
34 | UINT8 *Stack;\r |
35 | \r | |
36 | Stack = AllocatePages (EL0_STACK_PAGES);\r | |
37 | if (Stack == NULL) {\r | |
38 | return RETURN_OUT_OF_RESOURCES;\r | |
39 | }\r | |
40 | \r | |
41 | RegisterEl0Stack ((UINT8 *)Stack + EFI_PAGES_TO_SIZE (EL0_STACK_PAGES));\r | |
2939c778 EC |
42 | \r |
43 | if (ArmReadCurrentEL() == AARCH64_EL2) {\r | |
44 | HcrReg = ArmReadHcr();\r | |
45 | \r | |
46 | // Trap General Exceptions. All exceptions that would be routed to EL1 are routed to EL2\r | |
47 | HcrReg |= ARM_HCR_TGE;\r | |
48 | \r | |
49 | ArmWriteHcr(HcrReg);\r | |
50 | }\r | |
51 | \r | |
52 | return RETURN_SUCCESS;\r | |
53 | }\r |