| 1 | /** @file
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| 2 | * VM - The Virtual Machine, CPU Host Call Interface (AMD64 & x86 only).
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2022 Oracle and/or its affiliates.
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| 7 | *
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| 8 | * This file is part of VirtualBox base platform packages, as
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| 9 | * available from https://www.alldomusa.eu.org.
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| 10 | *
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| 11 | * This program is free software; you can redistribute it and/or
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| 12 | * modify it under the terms of the GNU General Public License
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| 13 | * as published by the Free Software Foundation, in version 3 of the
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| 14 | * License.
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| 15 | *
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| 16 | * This program is distributed in the hope that it will be useful, but
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | * General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 23 | *
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| 24 | * The contents of this file may alternatively be used under the terms
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| 25 | * of the Common Development and Distribution License Version 1.0
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| 26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 27 | * in the VirtualBox distribution, in which case the provisions of the
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| 28 | * CDDL are applicable instead of those of the GPL.
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| 29 | *
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| 30 | * You may elect to license modified versions of this file under the
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| 31 | * terms and conditions of either the GPL or the CDDL or both.
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| 32 | *
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| 33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 34 | */
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| 35 |
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| 36 | #ifndef VBOX_INCLUDED_vmm_cpuidcall_h
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| 37 | #define VBOX_INCLUDED_vmm_cpuidcall_h
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| 38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 39 | # pragma once
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| 40 | #endif
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| 41 |
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| 42 | #include <VBox/types.h>
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| 43 |
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| 44 |
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| 45 | /** @defgroup grp_cpuidcall VBox CPUID Host Call Interface (AMD64 & x86)
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| 46 | *
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| 47 | * This describes an interface using CPUID for calling the host from within the
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| 48 | * VM. This is chiefly intended for nested VM debugging at present and is
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| 49 | * therefore disabled by default.
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| 50 | *
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| 51 | * @{ */
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| 52 |
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| 53 | /** Fixed EAX value for all requests (big-endian 'VBox'). */
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| 54 | #define VBOX_CPUID_REQ_EAX_FIXED UINT32_C(0x56426f78)
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| 55 | /** Fixed portion of ECX for all requests. */
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| 56 | #define VBOX_CPUID_REQ_ECX_FIXED UINT32_C(0xc0de0000)
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| 57 | /** Fixed portion of ECX for all requests. */
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| 58 | #define VBOX_CPUID_REQ_ECX_FIXED_MASK UINT32_C(0xffff0000)
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| 59 | /** Function part of ECX for requests. */
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| 60 | #define VBOX_CPUID_REQ_ECX_FN_MASK UINT32_C(0x0000ffff)
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| 61 |
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| 62 | /** Generic ECX return value. */
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| 63 | #define VBOX_CPUID_RESP_GEN_ECX UINT32_C(0x19410612)
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| 64 | /** Generic EDX return value. */
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| 65 | #define VBOX_CPUID_RESP_GEN_EDX UINT32_C(0x19400412)
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| 66 | /** Generic EBX return value. */
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| 67 | #define VBOX_CPUID_RESP_GEN_EBX UINT32_C(0x19450508)
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| 68 |
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| 69 | /** @name Function \#1: Interface ID check and max function.
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| 70 | *
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| 71 | * Input: EDX & EBX content is unused and ignored. Best set to zero.
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| 72 | *
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| 73 | * Result: EAX:EDX:EBX forms the little endian string "VBox RuleZ!\0".
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| 74 | * ECX contains the max function number acccepted.
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| 75 | * @{ */
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| 76 | #define VBOX_CPUID_FN_ID UINT32_C(0x0001)
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| 77 | #define VBOX_CPUID_RESP_ID_EAX UINT32_C(0x786f4256)
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| 78 | #define VBOX_CPUID_RESP_ID_EDX UINT32_C(0x6c755220)
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| 79 | #define VBOX_CPUID_RESP_ID_EBX UINT32_C(0x00215A65)
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| 80 | #define VBOX_CPUID_RESP_ID_ECX UINT32_C(0x00000002)
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| 81 | /** @} */
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| 82 |
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| 83 | /** Function \#2: Write string to host Log.
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| 84 | *
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| 85 | * Input: EDX gives the number of bytes to log (max 2MB).
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| 86 | * EBX indicates the log to write to: 0 for debug, 1 for release.
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| 87 | * RSI is the FLAT pointer to the UTF-8 string to log.
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| 88 | *
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| 89 | * Output: EAX contains IPRT status code. ECX, EDX and EBX are set to the
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| 90 | * generic their response values (VBOX_CPUID_RESP_GEN_XXX). RSI is
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| 91 | * advanced EDX bytes on success.
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| 92 | *
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| 93 | * Except: May raise \#PF when reading the string. RSI and EDX is then be
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| 94 | * updated to the point where the page fault triggered, allowing paging
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| 95 | * in of logging buffer and such like.
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| 96 | *
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| 97 | * @note Buffer is not accessed if the target logger isn't enabled.
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| 98 | */
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| 99 | #define VBOX_CPUID_FN_LOG UINT32_C(0x0002)
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| 100 |
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| 101 |
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| 102 | /** @} */
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| 103 |
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| 104 | #endif /* !VBOX_INCLUDED_vmm_cpuidcall_h */
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| 105 |
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