| 1 | ; $Id: CPUMRCPatchHlp.asm 76553 2019-01-01 01:45:53Z vboxsync $
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| 2 | ;; @file
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| 3 | ; CPUM - Patch Helpers.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2015-2019 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 |
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| 18 |
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| 19 | ;*******************************************************************************
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| 20 | ;* Header Files *
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| 21 | ;*******************************************************************************
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| 22 | %include "VBox/asmdefs.mac"
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| 23 | %include "VBox/vmm/cpum.mac"
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| 24 | %include "CPUMInternal.mac"
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| 25 | %include "VBox/vmm/vm.mac"
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| 26 | %include "VMMRC.mac"
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| 27 | %include "iprt/x86.mac"
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| 28 |
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| 29 |
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| 30 | ;*******************************************************************************
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| 31 | ;* External Symbols *
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| 32 | ;*******************************************************************************
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| 33 | extern IMPNAME(g_VM)
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| 34 |
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| 35 |
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| 36 | BEGIN_PATCH_HLP_SEG
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| 37 |
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| 38 | ;;
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| 39 | ; Helper for PATMCpuidReplacement.
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| 40 | ;
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| 41 | ; We have at most 32 bytes of stack to play with, .
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| 42 | ;
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| 43 | ; @input eax, ecx(, edx, ebx)
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| 44 | ; @output eax, ebx, ecx, ebx
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| 45 | ;
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| 46 | ; @uses eflags (caller saves them)
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| 47 | ;
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| 48 | BEGINPROC_EXPORTED CPUMPatchHlpCpuId
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| 49 | ; Save the registers we use for passthru and sub-leaf matching (eax is not used).
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| 50 | push edx
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| 51 | push ecx
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| 52 | push ebx
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| 53 |
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| 54 | ; Use edi as VM pointer.
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| 55 | push edi
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| 56 | mov edi, IMP_SEG(ss, g_VM)
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| 57 |
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| 58 | %define CPUMCPUIDLEAF_SIZE_LOG2 5 ; ASSUMES CPUMCPUIDLEAF_size == 32
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| 59 |
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| 60 | ;
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| 61 | ; Perform a binary search looking for leaf with the EAX value.
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| 62 | ;
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| 63 | mov edx, [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.cCpuIdLeaves]
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| 64 | mov ecx, [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.paCpuIdLeavesRC]
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| 65 | test edx, edx
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| 66 | jz cpuid_unknown
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| 67 | shl edx, CPUMCPUIDLEAF_SIZE_LOG2
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| 68 | add edx, ecx ; edx = end (exclusive); ecx = start.
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| 69 |
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| 70 | cpuid_lookup_leaf:
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| 71 | ; Find the middle element
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| 72 | mov ebx, edx
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| 73 | cpuid_lookup_leaf_ebx_loaded:
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| 74 | sub ebx, ecx
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| 75 | shr ebx, 1 + CPUMCPUIDLEAF_SIZE_LOG2
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| 76 | shl ebx, CPUMCPUIDLEAF_SIZE_LOG2
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| 77 | add ebx, ecx ; ebx = middle element.
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| 78 |
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| 79 | ; Compare.
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| 80 | cmp eax, [ss:ebx + CPUMCPUIDLEAF.uLeaf]
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| 81 | jae cpuid_lookup_split_up
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| 82 |
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| 83 | ; The leaf is before ebx.
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| 84 | cpuid_lookup_split_down:
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| 85 | cmp ecx, ebx ; start == middle? if so, we failed.
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| 86 | mov edx, ebx ; end = middle;
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| 87 | jne cpuid_lookup_leaf_ebx_loaded
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| 88 | jmp cpuid_unknown
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| 89 |
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| 90 | ; The leaf is at or after ebx.
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| 91 | cpuid_lookup_split_up:
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| 92 | je cpuid_match_eax
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| 93 | lea ecx, [ebx + CPUMCPUIDLEAF_size] ; start = middle + 1
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| 94 | cmp ecx, edx ; middle + 1 == start? if so, we failed.
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| 95 | jne cpuid_lookup_leaf
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| 96 | jmp cpuid_unknown
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| 97 |
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| 98 | ;
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| 99 | ; We've to a matching leaf, does the sub-leaf match too?
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| 100 | ;
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| 101 | cpuid_match_eax:
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| 102 | mov ecx, [esp + 4]
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| 103 | and ecx, [ss:ebx + CPUMCPUIDLEAF.fSubLeafMask]
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| 104 | cmp ecx, [ss:ebx + CPUMCPUIDLEAF.uSubLeaf]
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| 105 | je cpuid_fetch
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| 106 | ja cpuid_lookup_subleaf_forwards
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| 107 |
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| 108 | ;
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| 109 | ; Search backwards.
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| 110 | ;
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| 111 | cpuid_lookup_subleaf_backwards:
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| 112 | mov edx, [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.paCpuIdLeavesRC] ; edx = first leaf
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| 113 |
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| 114 | cpuid_lookup_subleaf_backwards_loop:
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| 115 | cmp ebx, edx ; Is there a leaf before the current?
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| 116 | jbe cpuid_subleaf_not_found ; If not we're out of luck.
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| 117 | cmp eax, [ss:ebx - CPUMCPUIDLEAF_size + CPUMCPUIDLEAF.uLeaf]
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| 118 | jne cpuid_subleaf_not_found ; If the leaf before us does not have the same leaf number, we failed.
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| 119 | sub ebx, CPUMCPUIDLEAF_size
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| 120 | cmp ecx, [ss:ebx + CPUMCPUIDLEAF.uSubLeaf]
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| 121 | je cpuid_fetch ; If the subleaf matches, we're good!.
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| 122 | jb cpuid_lookup_subleaf_backwards_loop ; Still hope if the subleaf we're seeking is smaller.
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| 123 | jmp cpuid_subleaf_not_found ; Too bad.
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| 124 |
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| 125 | ;
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| 126 | ; Search forward until we've got a matching sub-leaf (or not).
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| 127 | ;
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| 128 | cpuid_lookup_subleaf_forwards:
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| 129 | ; Calculate the last leaf address.
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| 130 | mov edx, [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.cCpuIdLeaves]
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| 131 | dec edx
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| 132 | shl edx, CPUMCPUIDLEAF_SIZE_LOG2
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| 133 | add edx, [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.paCpuIdLeavesRC] ; edx = last leaf (inclusive)
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| 134 |
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| 135 | cpuid_subleaf_lookup:
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| 136 | cmp ebx, edx
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| 137 | jae cpuid_subleaf_not_found
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| 138 | cmp eax, [ss:ebx + CPUMCPUIDLEAF_size + CPUMCPUIDLEAF.uLeaf]
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| 139 | jne cpuid_subleaf_not_found
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| 140 | add ebx, CPUMCPUIDLEAF_size
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| 141 | cmp ecx, [ss:ebx + CPUMCPUIDLEAF.uSubLeaf]
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| 142 | ja cpuid_subleaf_lookup
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| 143 | je cpuid_fetch
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| 144 |
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| 145 | ;
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| 146 | ; Out of range sub-leaves aren't quite as easy and pretty as we emulate them
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| 147 | ; here, but we do an adequate job.
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| 148 | ;
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| 149 | cpuid_subleaf_not_found:
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| 150 | xor ecx, ecx
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| 151 | test dword [ss:ebx + CPUMCPUIDLEAF.fFlags], CPUMCPUIDLEAF_F_INTEL_TOPOLOGY_SUBLEAVES
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| 152 | jz cpuid_load_zeros_except_ecx
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| 153 | mov ecx, [esp + 4]
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| 154 | and ecx, 0ffh
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| 155 | cpuid_load_zeros_except_ecx:
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| 156 | xor edx, edx
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| 157 | xor eax, eax
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| 158 | xor ebx, ebx
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| 159 | jmp cpuid_done
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| 160 |
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| 161 | ;
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| 162 | ; Different CPUs have different ways of dealing with unknown CPUID leaves.
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| 163 | ;
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| 164 | cpuid_unknown:
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| 165 | mov ebx, IMP_SEG(ss, g_VM)
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| 166 | mov dword [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.enmUnknownCpuIdMethod], CPUMUNKNOWNCPUID_PASSTHRU
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| 167 | je cpuid_unknown_passthru
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| 168 | ; Load the default cpuid leaf.
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| 169 | cpuid_unknown_def_leaf:
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| 170 | mov edx, [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.DefCpuId + CPUMCPUID.uEdx]
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| 171 | mov ecx, [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.DefCpuId + CPUMCPUID.uEcx]
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| 172 | mov eax, [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.DefCpuId + CPUMCPUID.uEax]
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| 173 | mov ebx, [ss:edi + VM.cpum + CPUM.GuestInfo + CPUMINFO.DefCpuId + CPUMCPUID.uEbx]
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| 174 | jmp cpuid_done
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| 175 | ; Pass thru the input values unmodified (eax is still virgin).
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| 176 | cpuid_unknown_passthru:
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| 177 | mov edx, [esp + 8]
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| 178 | mov ecx, [esp + 4]
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| 179 | mov ebx, [esp]
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| 180 | jmp cpuid_done
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| 181 |
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| 182 | ;
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| 183 | ; Normal return unless flags (we ignore APIC_ID as we only have a single CPU with ID 0).
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| 184 | ;
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| 185 | cpuid_fetch:
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| 186 | test dword [ss:ebx + CPUMCPUIDLEAF.fFlags], CPUMCPUIDLEAF_F_CONTAINS_APIC | CPUMCPUIDLEAF_F_CONTAINS_OSXSAVE
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| 187 | jnz cpuid_fetch_with_flags
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| 188 | mov edx, [ss:ebx + CPUMCPUIDLEAF.uEdx]
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| 189 | mov ecx, [ss:ebx + CPUMCPUIDLEAF.uEcx]
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| 190 | mov eax, [ss:ebx + CPUMCPUIDLEAF.uEax]
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| 191 | mov ebx, [ss:ebx + CPUMCPUIDLEAF.uEbx]
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| 192 |
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| 193 | cpuid_done:
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| 194 | pop edi
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| 195 | add esp, 12
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| 196 | ret
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| 197 |
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| 198 |
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| 199 | ;
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| 200 | ; Need to adjust the result according to VCpu state.
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| 201 | ;
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| 202 | ; APIC: CPUID[0x00000001].EDX[9] &= pVCpu->cpum.s.fCpuIdApicFeatureVisible;
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| 203 | ; CPUID[0x80000001].EDX[9] &= pVCpu->cpum.s.fCpuIdApicFeatureVisible;
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| 204 | ;
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| 205 | ; OSXSAVE: CPUID[0x00000001].ECX[27] = CR4.OSXSAVE;
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| 206 | ;
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| 207 | cpuid_fetch_with_flags:
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| 208 | mov edx, [ss:ebx + CPUMCPUIDLEAF.uEdx]
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| 209 | mov ecx, [ss:ebx + CPUMCPUIDLEAF.uEcx]
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| 210 |
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| 211 | mov eax, [ss:edi + VM.offVMCPU]
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| 212 |
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| 213 | ; APIC
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| 214 | test dword [ss:ebx + CPUMCPUIDLEAF.fFlags], CPUMCPUIDLEAF_F_CONTAINS_APIC
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| 215 | jz cpuid_fetch_with_flags_done_apic
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| 216 | test byte [ss:edi + eax + VMCPU.cpum + CPUMCPU.fCpuIdApicFeatureVisible], 0ffh
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| 217 | jnz cpuid_fetch_with_flags_done_apic
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| 218 | and edx, ~X86_CPUID_FEATURE_EDX_APIC
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| 219 | cpuid_fetch_with_flags_done_apic:
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| 220 |
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| 221 | ; OSXSAVE
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| 222 | test dword [ss:ebx + CPUMCPUIDLEAF.fFlags], CPUMCPUIDLEAF_F_CONTAINS_OSXSAVE
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| 223 | jz cpuid_fetch_with_flags_done_osxsave
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| 224 | and ecx, ~X86_CPUID_FEATURE_ECX_OSXSAVE
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| 225 | test dword [ss:edi + eax + VMCPU.cpum + CPUMCPU.Guest.cr4], X86_CR4_OSXSAVE
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| 226 | jz cpuid_fetch_with_flags_done_osxsave
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| 227 | or ecx, X86_CPUID_FEATURE_ECX_OSXSAVE
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| 228 | cpuid_fetch_with_flags_done_osxsave:
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| 229 |
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| 230 | ; Load the two remaining registers and jump to the common normal exit.
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| 231 | mov eax, [ss:ebx + CPUMCPUIDLEAF.uEax]
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| 232 | mov ebx, [ss:ebx + CPUMCPUIDLEAF.uEbx]
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| 233 | jmp cpuid_done
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| 234 |
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| 235 | ENDPROC CPUMPatchHlpCpuId
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| 236 |
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