[RFC PATCH v2 12/44] MdePkg: Add a structure definition for the GHCB

["Lendacky, Thomas" <thomas.lendacky@amd.com>]

From: Tom Lendacky <thomas.lendacky@amd.com>

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

The GHCB is used by an SEV-ES guest for communicating between the guest
and the hypervisor. Create the GHCB definition as defined by the GHCB
protocol definition.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 MdePkg/Include/Register/Amd/Ghcb.h | 105 +++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 MdePkg/Include/Register/Amd/Ghcb.h

diff --git a/MdePkg/Include/Register/Amd/Ghcb.h b/MdePkg/Include/Register/Amd/Ghcb.h
new file mode 100644
index 000000000000..cd3c98091208
--- /dev/null
+++ b/MdePkg/Include/Register/Amd/Ghcb.h
@@ -0,0 +1,105 @@
+
+#ifndef __GHCB_H__
+#define __GHCB_H__
+
+#include <Protocol/DebugSupport.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+
+#define UD_EXCEPTION  6
+#define GP_EXCEPTION 13
+
+#define GHCB_VERSION_MIN     1
+#define GHCB_VERSION_MAX     1
+
+#define GHCB_STANDARD_USAGE  0
+
+typedef enum {
+  SvmExitDr7Read       = 0x27,
+  SvmExitDr7Write      = 0x37,
+  SvmExitRdtsc         = 0x6E,
+  SvmExitRdpmc,
+  SvmExitCpuid         = 0x72,
+  SvmExitInvd          = 0x76,
+  SvmExitIoioProt      = 0x7B,
+  SvmExitMsr,
+  SvmExitVmmCall       = 0x81,
+  SvmExitRdtscp        = 0x87,
+  SvmExitWbinvd        = 0x89,
+  SvmExitMonitor,
+  SvmExitMwait,
+  SvmExitNpf           = 0x400,
+
+  // VMG special exits
+  SvmExitMmioRead      = 0x80000001,
+  SvmExitMmioWrite,
+  SvmExitNmiComplete,
+  SvmExitApResetHold,
+
+  SvmExitUnsupported   = 0x8000FFFF,
+} SVM_EXITCODE;
+
+typedef enum {
+  GhcbCpl              = 25,
+  GhcbRflags           = 46,
+  GhcbRip,
+  GhcbRsp              = 59,
+  GhcbRax              = 63,
+  GhcbRcx              = 97,
+  GhcbRdx,
+  GhcbRbx,
+  GhcbRbp              = 101,
+  GhcbRsi,
+  GhcbRdi,
+  GhcbR8,
+  GhcbR9,
+  GhcbR10,
+  GhcbR11,
+  GhcbR12,
+  GhcbR13,
+  GhcbR14,
+  GhcbR15,
+  GhcbXCr0             = 125,
+} GHCB_REGISTER;
+
+typedef struct {
+  UINT8                  Reserved1[203];
+  UINT8                  Cpl;
+  UINT8                  Reserved2[148];
+  UINT64                 Dr7;
+  UINT8                  Reserved3[144];
+  UINT64                 Rax;
+  UINT8                  Reserved4[264];
+  UINT64                 Rcx;
+  UINT64                 Rdx;
+  UINT64                 Rbx;
+  UINT8                  Reserved5[112];
+  UINT64                 SwExitCode;
+  UINT64                 SwExitInfo1;
+  UINT64                 SwExitInfo2;
+  UINT64                 SwScratch;
+  UINT8                  Reserved6[56];
+  UINT64                 XCr0;
+  UINT8                  ValidBitmap[16];
+  UINT64                 X87StateGpa;
+  UINT8                  Reserved7[1016];
+} __attribute__ ((__packed__)) GHCB_SAVE_AREA;
+
+typedef struct {
+  GHCB_SAVE_AREA         SaveArea;
+  UINT8                  SharedBuffer[2032];
+  UINT8                  Reserved1[10];
+  UINT16                 ProtocolVersion;
+  UINT32                 GhcbUsage;
+} __attribute__ ((__packed__)) __attribute__ ((aligned(SIZE_4KB))) GHCB;
+
+typedef union {
+  struct {
+    UINT32  Lower32Bits;
+    UINT32  Upper32Bits;
+  } Elements;
+
+  UINT64    Uint64;
+} GHCB_EXIT_INFO;
+
+#endif
-- 
2.17.1