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48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
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/** @file
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Define the FIRST_SMI_HANDLER_CONTEXT structure, which is an exchange area
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between the SMM Monarch and the hot-added CPU, for relocating the SMBASE of
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the hot-added CPU.
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Copyright (c) 2020, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef FIRST_SMI_HANDLER_CONTEXT_H_
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#define FIRST_SMI_HANDLER_CONTEXT_H_
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//
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// The following structure is used to communicate between the SMM Monarch
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// (running the root MMI handler) and the hot-added CPU (handling its first
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// SMI). It is placed at SMM_DEFAULT_SMBASE, which is in SMRAM under QEMU's
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// "SMRAM at default SMBASE" feature.
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//
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#pragma pack (1)
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typedef struct {
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//
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// When ApicIdGate is MAX_UINT64, then no hot-added CPU may proceed with
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// SMBASE relocation.
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//
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// Otherwise, the hot-added CPU whose APIC ID equals ApicIdGate may proceed
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// with SMBASE relocation.
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//
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// This field is intentionally wider than APIC_ID (UINT32) because we need a
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// "gate locked" value that is different from all possible APIC_IDs.
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//
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UINT64 ApicIdGate;
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//
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// The new SMBASE value for the hot-added CPU to set in the SMRAM Save State
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// Map, before leaving SMM with the RSM instruction.
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//
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UINT32 NewSmbase;
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//
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// The hot-added CPU sets this field to 1 right before executing the RSM
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// instruction. This tells the SMM Monarch to proceed to polling the last
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// byte of the normal RAM reserved page (Post-SMM Pen).
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//
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UINT8 AboutToLeaveSmm;
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} FIRST_SMI_HANDLER_CONTEXT;
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#pragma pack ()
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#endif // FIRST_SMI_HANDLER_CONTEXT_H_
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