0d7601e546
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198 A hypervisor is not allowed to update an SEV-ES guests register state, so when booting an SEV-ES guest AP, the hypervisor is not allowed to set the RIP to the guest requested value. Instead, an SEV-ES AP must be transition from 64-bit long mode to 16-bit real mode in response to an INIT-SIPI-SIPI sequence. This requires a 16-bit code segment descriptor. For PEI, create this descriptor in the reset vector GDT table. For DXE, create this descriptor from the newly reserved entry at location 0x28. Cc: Eric Dong <eric.dong@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Eric Dong <eric.dong@intel.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/** @file
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C based implementation of IA32 interrupt handling only
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requiring a minimal assembly interrupt entry point.
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Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _CPU_GDT_H_
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#define _CPU_GDT_H_
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//
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// Local structure definitions
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//
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#pragma pack (1)
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//
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// Global Descriptor Entry structures
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//
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typedef struct _GDT_ENTRY {
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UINT16 Limit15_0;
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UINT16 Base15_0;
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UINT8 Base23_16;
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UINT8 Type;
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UINT8 Limit19_16_and_flags;
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UINT8 Base31_24;
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} GDT_ENTRY;
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typedef
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struct _GDT_ENTRIES {
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GDT_ENTRY Null;
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GDT_ENTRY Linear;
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GDT_ENTRY LinearCode;
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GDT_ENTRY SysData;
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GDT_ENTRY SysCode;
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GDT_ENTRY SysCode16;
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GDT_ENTRY LinearData64;
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GDT_ENTRY LinearCode64;
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GDT_ENTRY Spare5;
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} GDT_ENTRIES;
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#pragma pack ()
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#define NULL_SEL OFFSET_OF (GDT_ENTRIES, Null)
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#define LINEAR_SEL OFFSET_OF (GDT_ENTRIES, Linear)
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#define LINEAR_CODE_SEL OFFSET_OF (GDT_ENTRIES, LinearCode)
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#define SYS_DATA_SEL OFFSET_OF (GDT_ENTRIES, SysData)
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#define SYS_CODE_SEL OFFSET_OF (GDT_ENTRIES, SysCode)
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#define SYS_CODE16_SEL OFFSET_OF (GDT_ENTRIES, SysCode16)
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#define LINEAR_DATA64_SEL OFFSET_OF (GDT_ENTRIES, LinearData64)
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#define LINEAR_CODE64_SEL OFFSET_OF (GDT_ENTRIES, LinearCode64)
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#define SPARE5_SEL OFFSET_OF (GDT_ENTRIES, Spare5)
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#if defined (MDE_CPU_IA32)
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#define CPU_CODE_SEL LINEAR_CODE_SEL
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#define CPU_DATA_SEL LINEAR_SEL
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#elif defined (MDE_CPU_X64)
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#define CPU_CODE_SEL LINEAR_CODE64_SEL
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#define CPU_DATA_SEL LINEAR_DATA64_SEL
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#else
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#error CPU type not supported for CPU GDT initialization!
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#endif
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#endif // _CPU_GDT_H_
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