96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
/** @file
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Copyright (C) 2019, vit9696. All rights reserved.
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All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef CONTEXT_SWITCH_H
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#define CONTEXT_SWITCH_H
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//
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// Structure definitions shared with ASM code.
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// Keep these definitions in sync with ContextSwitch.nasm!
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//
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#pragma pack(push, 1)
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/**
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Assembly support state.
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This state is used as an intermediate structure to hold UEFI environment
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context and kernel environment context for switching between 32-bit
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and 64-bit modes during booting as normal XNU boot still happens in 32-bit.
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**/
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typedef PACKED struct ASM_SUPPORT_STATE_ {
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UINT64 SavedGDTR;
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UINT16 SavedGDTRLimit;
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UINT64 SavedIDTR;
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UINT16 SavedIDTRLimit;
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UINT64 SavedCR3;
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UINT16 SavedCS;
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UINT16 SavedDS;
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UINT16 SavedES;
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UINT16 SavedFS;
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UINT16 SavedGS;
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UINT64 SavedGDTR32;
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UINT16 SavedGDTR32Limit;
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UINT64 SavedIDTR32;
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UINT16 SavedIDTR32Limit;
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UINT16 SavedCS32;
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UINT16 SavedDS32;
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UINT16 SavedES32;
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UINT16 SavedFS32;
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UINT16 SavedGS32;
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VOID *KernelEntry;
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} ASM_SUPPORT_STATE;
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/**
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Assembly kernel trampoline.
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This structure contains encoded assembly to jump from kernel
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code to UEFI code through AsmAppleMapPlatformPrepareKernelState
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intermediate handler.
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**/
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typedef PACKED struct ASM_KERNEL_JUMP_ {
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UINT8 MovInst;
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UINT32 Addr;
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UINT16 CallInst;
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} ASM_KERNEL_JUMP;
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#pragma pack(pop)
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/**
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Assembly interface to save UEFI environment state in specific way.
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@param[in,out] AsmState Assembly state to update, can be preserved.
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**/
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VOID
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EFIAPI
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AsmAppleMapPlatformSaveState (
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IN OUT ASM_SUPPORT_STATE *AsmState
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);
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/**
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Assembly interface for backjump from kernel code.
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Takes kernel arguments through RAX or EAX register.
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**/
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VOID
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AsmAppleMapPlatformPrepareKernelState (
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);
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/**
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Assembly global variable containing ASM_SUPPORT_STATE address.
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Must fit into lower 32-bit bytes due to 32-bit .
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**/
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extern UINT32 gOcAbcAsmStateAddr32;
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#endif // CONTEXT_SWITCH_H
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