VirtualBox

Changeset 100811 in vbox for trunk/src/VBox/VMM/include


Ignore:
Timestamp:
Aug 6, 2023 1:54:38 AM (18 months ago)
Author:
vboxsync
Message:

VMM/IEM: Working on implementing the FLAT mode (64-bit mode and 32-bit FLAT) optimizations. Introduced a special 64-bit FS+GS(+CS) variant so we can deal with it the same way as the flat 32-bit variant, this means lumping CS prefixed stuff (unlikely) in with FS and GS. We call the FLAT variant for DS, ES, and SS accesses and the other mode for memory accesses via FS, GS and CS. bugref:10369

Location:
trunk/src/VBox/VMM/include
Files:
2 edited

Legend:

Unmodified
Added
Removed

  • trunk/src/VBox/VMM/include/IEMInternal.h

    r100803 r100811  
    45884588uint16_t        iemMemFetchDataU16Jmp(PVMCPUCC pVCpu, uint8_t iSegReg, RTGCPTR GCPtrMem) IEM_NOEXCEPT_MAY_LONGJMP;
    45894589uint32_t        iemMemFetchDataU32Jmp(PVMCPUCC pVCpu, uint8_t iSegReg, RTGCPTR GCPtrMem) IEM_NOEXCEPT_MAY_LONGJMP;
     4590uint32_t        iemMemFlatFetchDataU32Jmp(PVMCPUCC pVCpu, RTGCPTR GCPtrMem) IEM_NOEXCEPT_MAY_LONGJMP;
    45904591uint64_t        iemMemFetchDataU64Jmp(PVMCPUCC pVCpu, uint8_t iSegReg, RTGCPTR GCPtrMem) IEM_NOEXCEPT_MAY_LONGJMP;
    45914592uint64_t        iemMemFetchDataU64AlignedU128Jmp(PVMCPUCC pVCpu, uint8_t iSegReg, RTGCPTR GCPtrMem) IEM_NOEXCEPT_MAY_LONGJMP;

  • trunk/src/VBox/VMM/include/IEMMc.h

    r100804 r100811  
    814814# define IEM_MC_FETCH_MEM32_U8(a_u8Dst, a_iSeg, a_GCPtrMem32) \
    815815    ((a_u8Dst) = iemMemFetchDataU8Jmp(pVCpu, (a_iSeg), (a_GCPtrMem32)))
     816
     817# define IEM_MC_FETCH_MEM_FLAT_U8(a_u8Dst, a_GCPtrMem) \
     818    ((a_u8Dst) = iemMemFetchDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     819# define IEM_MC_FETCH_MEM16_FLAT_U8(a_u8Dst, a_GCPtrMem16) \
     820    ((a_u8Dst) = iemMemFetchDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem16)))
     821# define IEM_MC_FETCH_MEM32_FLAT_U8(a_u8Dst, a_GCPtrMem32) \
     822    ((a_u8Dst) = iemMemFetchDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem32)))
    816823#endif
    817824
    … …  
    830837# define IEM_MC_FETCH_MEM_I16(a_i16Dst, a_iSeg, a_GCPtrMem) \
    831838    ((a_i16Dst) = (int16_t)iemMemFetchDataU16Jmp(pVCpu, (a_iSeg), (a_GCPtrMem)))
     839
     840# define IEM_MC_FETCH_MEM_FLAT_U16(a_u16Dst, a_GCPtrMem) \
     841    ((a_u16Dst) = iemMemFetchDataU16Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     842# define IEM_MC_FETCH_MEM_FLAT_U16_DISP(a_u16Dst, a_GCPtrMem, a_offDisp) \
     843    ((a_u16Dst) = iemMemFetchDataU16Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem) + (a_offDisp)))
     844# define IEM_MC_FETCH_MEM_FLAT_I16(a_i16Dst, a_GCPtrMem) \
     845    ((a_i16Dst) = (int16_t)iemMemFetchDataU16Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
    832846#endif
    833847
    … …  
    846860# define IEM_MC_FETCH_MEM_I32(a_i32Dst, a_iSeg, a_GCPtrMem) \
    847861    ((a_i32Dst) = (int32_t)iemMemFetchDataU32Jmp(pVCpu, (a_iSeg), (a_GCPtrMem)))
     862
     863# define IEM_MC_FETCH_MEM_FLAT_U32(a_u32Dst, a_GCPtrMem) \
     864    ((a_u32Dst) = iemMemFlatFetchDataU32Jmp(pVCpu, (a_GCPtrMem)))
     865# define IEM_MC_FETCH_MEM_FLAT_U32_DISP(a_u32Dst, a_GCPtrMem, a_offDisp) \
     866    ((a_u32Dst) = iemMemFlatFetchDataU32Jmp(pVCpu, (a_GCPtrMem) + (a_offDisp)))
     867# define IEM_MC_FETCH_MEM_FLAT_I32(a_i32Dst, a_GCPtrMem) \
     868    ((a_i32Dst) = (int32_t)iemMemFlatFetchDataU32Jmp(pVCpu, (a_GCPtrMem)))
    848869#endif
    849870
    … …  
    871892# define IEM_MC_FETCH_MEM_I64(a_i64Dst, a_iSeg, a_GCPtrMem) \
    872893    ((a_i64Dst) = (int64_t)iemMemFetchDataU64Jmp(pVCpu, (a_iSeg), (a_GCPtrMem)))
     894
     895# define IEM_MC_FETCH_MEM_FLAT_U64(a_u64Dst, a_GCPtrMem) \
     896    ((a_u64Dst) = iemMemFetchDataU64Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     897# define IEM_MC_FETCH_MEM_FLAT_U64_DISP(a_u64Dst, a_GCPtrMem, a_offDisp) \
     898    ((a_u64Dst) = iemMemFetchDataU64Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem) + (a_offDisp)))
     899# define IEM_MC_FETCH_MEM_FLAT_U64_ALIGN_U128(a_u64Dst, a_GCPtrMem) \
     900    ((a_u64Dst) = iemMemFetchDataU64AlignedU128Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     901# define IEM_MC_FETCH_MEM_FLAT_I64(a_i64Dst, a_GCPtrMem) \
     902    ((a_i64Dst) = (int64_t)iemMemFetchDataU64Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
    873903#endif
    874904
    … …  
    891921# define IEM_MC_FETCH_MEM_D80(a_d80Dst, a_iSeg, a_GCPtrMem) \
    892922    iemMemFetchDataD80Jmp(pVCpu, &(a_d80Dst), (a_iSeg), (a_GCPtrMem))
     923
     924# define IEM_MC_FETCH_MEM_FLAT_R32(a_r32Dst, a_GCPtrMem) \
     925    ((a_r32Dst).u = iemMemFlatFetchDataU32Jmp(pVCpu, (a_GCPtrMem)))
     926# define IEM_MC_FETCH_MEM_FLAT_R64(a_r64Dst, a_GCPtrMem) \
     927    ((a_r64Dst).u = iemMemFetchDataU64Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     928# define IEM_MC_FETCH_MEM_FLAT_R80(a_r80Dst, a_GCPtrMem) \
     929    iemMemFetchDataR80Jmp(pVCpu, &(a_r80Dst), UINT8_MAX, (a_GCPtrMem))
     930# define IEM_MC_FETCH_MEM_FLAT_D80(a_d80Dst, a_GCPtrMem) \
     931    iemMemFetchDataD80Jmp(pVCpu, &(a_d80Dst), UINT8_MAX, (a_GCPtrMem))
    893932#endif
    894933
    … …  
    929968# define IEM_MC_FETCH_MEM_XMM_U64(a_XmmDst, a_iQWord, a_iSeg, a_GCPtrMem) \
    930969    (a_XmmDst).au64[(a_iQWord)] = iemMemFetchDataU64Jmp(pVCpu, (a_iSeg), (a_GCPtrMem))
     970
     971# define IEM_MC_FETCH_MEM_FLAT_U128(a_u128Dst, a_GCPtrMem) \
     972    iemMemFetchDataU128Jmp(pVCpu, &(a_u128Dst), UINT8_MAX, (a_GCPtrMem))
     973# define IEM_MC_FETCH_MEM_FLAT_U128_NO_AC(a_u128Dst, a_GCPtrMem) \
     974    iemMemFetchDataU128Jmp(pVCpu, &(a_u128Dst), UINT8_MAX, (a_GCPtrMem))
     975# define IEM_MC_FETCH_MEM_FLAT_U128_ALIGN_SSE(a_u128Dst, a_GCPtrMem) \
     976    iemMemFetchDataU128AlignedSseJmp(pVCpu, &(a_u128Dst), UINT8_MAX, (a_GCPtrMem))
     977
     978# define IEM_MC_FETCH_MEM_FLAT_XMM(a_XmmDst, a_GCPtrMem) \
     979    iemMemFetchDataU128Jmp(pVCpu, &(a_XmmDst).uXmm, UINT8_MAX, (a_GCPtrMem))
     980# define IEM_MC_FETCH_MEM_FLAT_XMM_NO_AC(a_XmmDst, a_GCPtrMem) \
     981    iemMemFetchDataU128Jmp(pVCpu, &(a_XmmDst).uXmm, UINT8_MAX, (a_GCPtrMem))
     982# define IEM_MC_FETCH_MEM_FLAT_XMM_ALIGN_SSE(a_XmmDst, a_GCPtrMem) \
     983    iemMemFetchDataU128AlignedSseJmp(pVCpu, &(a_XmmDst).uXmm, UINT8_MAX, (a_GCPtrMem))
     984# define IEM_MC_FETCH_MEM_FLAT_XMM_U32(a_XmmDst, a_iDWord, a_GCPtrMem) \
     985    (a_XmmDst).au32[(a_iDWord)] = iemMemFlatFetchDataU32Jmp(pVCpu, (a_GCPtrMem))
     986# define IEM_MC_FETCH_MEM_FLAT_XMM_U64(a_XmmDst, a_iQWord, a_GCPtrMem) \
     987    (a_XmmDst).au64[(a_iQWord)] = iemMemFetchDataU64Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem))
    931988#endif
    932989
    … …  
    9591016# define IEM_MC_FETCH_MEM_YMM_ALIGN_AVX(a_YmmDst, a_iSeg, a_GCPtrMem) \
    9601017    iemMemFetchDataU256AlignedSseJmp(pVCpu, &(a_YmmDst).ymm, (a_iSeg), (a_GCPtrMem))
     1018
     1019# define IEM_MC_FETCH_MEM_FLAT_U256(a_u256Dst, a_GCPtrMem) \
     1020    iemMemFetchDataU256Jmp(pVCpu, &(a_u256Dst), UINT8_MAX, (a_GCPtrMem))
     1021# define IEM_MC_FETCH_MEM_FLAT_U256_NO_AC(a_u256Dst, a_GCPtrMem) \
     1022    iemMemFetchDataU256Jmp(pVCpu, &(a_u256Dst), UINT8_MAX, (a_GCPtrMem))
     1023# define IEM_MC_FETCH_MEM_FLAT_U256_ALIGN_AVX(a_u256Dst, a_GCPtrMem) \
     1024    iemMemFetchDataU256AlignedSseJmp(pVCpu, &(a_u256Dst), UINT8_MAX, (a_GCPtrMem))
     1025
     1026# define IEM_MC_FETCH_MEM_FLAT_YMM(a_YmmDst, a_GCPtrMem) \
     1027    iemMemFetchDataU256Jmp(pVCpu, &(a_YmmDst).ymm, UINT8_MAX, (a_GCPtrMem))
     1028# define IEM_MC_FETCH_MEM_FLAT_YMM_NO_AC(a_YmmDst, a_GCPtrMem) \
     1029    iemMemFetchDataU256Jmp(pVCpu, &(a_YmmDst).ymm, UINT8_MAX, (a_GCPtrMem))
     1030# define IEM_MC_FETCH_MEM_FLAT_YMM_ALIGN_AVX(a_YmmDst, a_GCPtrMem) \
     1031    iemMemFetchDataU256AlignedSseJmp(pVCpu, &(a_YmmDst).ymm, UINT8_MAX, (a_GCPtrMem))
    9611032#endif
    9621033
    … …  
    10131084# define IEM_MC_FETCH_MEM_U32_ZX_U64(a_u64Dst, a_iSeg, a_GCPtrMem) \
    10141085    ((a_u64Dst) = iemMemFetchDataU32Jmp(pVCpu, (a_iSeg), (a_GCPtrMem)))
     1086
     1087# define IEM_MC_FETCH_MEM_FLAT_U8_ZX_U16(a_u16Dst, a_GCPtrMem) \
     1088    ((a_u16Dst) = iemMemFetchDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1089# define IEM_MC_FETCH_MEM_FLAT_U8_ZX_U32(a_u32Dst, a_GCPtrMem) \
     1090    ((a_u32Dst) = iemMemFetchDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1091# define IEM_MC_FETCH_MEM_FLAT_U8_ZX_U64(a_u64Dst, a_GCPtrMem) \
     1092    ((a_u64Dst) = iemMemFetchDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1093# define IEM_MC_FETCH_MEM_FLAT_U16_ZX_U32(a_u32Dst, a_GCPtrMem) \
     1094    ((a_u32Dst) = iemMemFetchDataU16Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1095# define IEM_MC_FETCH_MEM_FLAT_U16_ZX_U64(a_u64Dst, a_GCPtrMem) \
     1096    ((a_u64Dst) = iemMemFetchDataU16Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1097# define IEM_MC_FETCH_MEM_FLAT_U32_ZX_U64(a_u64Dst, a_GCPtrMem) \
     1098    ((a_u64Dst) = iemMemFlatFetchDataU32Jmp(pVCpu, (a_GCPtrMem)))
    10151099#endif /* IEM_WITH_SETJMP */
    10161100
    … …  
    10651149# define IEM_MC_FETCH_MEM_U32_SX_U64(a_u64Dst, a_iSeg, a_GCPtrMem) \
    10661150    ((a_u64Dst) = (int32_t)iemMemFetchDataU32Jmp(pVCpu, (a_iSeg), (a_GCPtrMem)))
     1151
     1152# define IEM_MC_FETCH_MEM_FLAT_U8_SX_U16(a_u16Dst, a_GCPtrMem) \
     1153    ((a_u16Dst) = (int8_t)iemMemFetchDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1154# define IEM_MC_FETCH_MEM_FLAT_U8_SX_U32(a_u32Dst, a_GCPtrMem) \
     1155    ((a_u32Dst) = (int8_t)iemMemFetchDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1156# define IEM_MC_FETCH_MEM_FLAT_U8_SX_U64(a_u64Dst, a_GCPtrMem) \
     1157    ((a_u64Dst) = (int8_t)iemMemFetchDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1158# define IEM_MC_FETCH_MEM_FLAT_U16_SX_U32(a_u32Dst, a_GCPtrMem) \
     1159    ((a_u32Dst) = (int16_t)iemMemFetchDataU16Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1160# define IEM_MC_FETCH_MEM_FLAT_U16_SX_U64(a_u64Dst, a_GCPtrMem) \
     1161    ((a_u64Dst) = (int16_t)iemMemFetchDataU16Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem)))
     1162# define IEM_MC_FETCH_MEM_FLAT_U32_SX_U64(a_u64Dst, a_GCPtrMem) \
     1163    ((a_u64Dst) = (int32_t)iemMemFlatFetchDataU32Jmp(pVCpu, (a_GCPtrMem)))
    10671164#endif /* IEM_WITH_SETJMP */
    10681165
    … …  
    10851182# define IEM_MC_STORE_MEM_U64(a_iSeg, a_GCPtrMem, a_u64Value) \
    10861183    iemMemStoreDataU64Jmp(pVCpu, (a_iSeg), (a_GCPtrMem), (a_u64Value))
     1184
     1185# define IEM_MC_STORE_MEM_FLAT_U8(a_GCPtrMem, a_u8Value) \
     1186    iemMemStoreDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u8Value))
     1187# define IEM_MC_STORE_MEM_FLAT_U16(a_GCPtrMem, a_u16Value) \
     1188    iemMemStoreDataU16Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u16Value))
     1189# define IEM_MC_STORE_MEM_FLAT_U32(a_GCPtrMem, a_u32Value) \
     1190    iemMemStoreDataU32Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u32Value))
     1191# define IEM_MC_STORE_MEM_FLAT_U64(a_GCPtrMem, a_u64Value) \
     1192    iemMemStoreDataU64Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u64Value))
    10871193#endif
    10881194
    … …  
    11051211# define IEM_MC_STORE_MEM_U64_CONST(a_iSeg, a_GCPtrMem, a_u64C) \
    11061212    iemMemStoreDataU64Jmp(pVCpu, (a_iSeg), (a_GCPtrMem), (a_u64C))
     1213
     1214# define IEM_MC_STORE_MEM_FLAT_U8_CONST(a_GCPtrMem, a_u8C) \
     1215    iemMemStoreDataU8Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u8C))
     1216# define IEM_MC_STORE_MEM_FLAT_U16_CONST(a_GCPtrMem, a_u16C) \
     1217    iemMemStoreDataU16Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u16C))
     1218# define IEM_MC_STORE_MEM_FLAT_U32_CONST(a_GCPtrMem, a_u32C) \
     1219    iemMemStoreDataU32Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u32C))
     1220# define IEM_MC_STORE_MEM_FLAT_U64_CONST(a_GCPtrMem, a_u64C) \
     1221    iemMemStoreDataU64Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u64C))
    11071222#endif
    11081223
    … …  
    11341249# define IEM_MC_STORE_MEM_U128_ALIGN_SSE(a_iSeg, a_GCPtrMem, a_u128Value) \
    11351250    iemMemStoreDataU128AlignedSseJmp(pVCpu, (a_iSeg), (a_GCPtrMem), (a_u128Value))
     1251
     1252# define IEM_MC_STORE_MEM_FLAT_U128(a_GCPtrMem, a_u128Value) \
     1253    iemMemStoreDataU128Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u128Value))
     1254# define IEM_MC_STORE_MEM_FLAT_U128_ALIGN_SSE(a_GCPtrMem, a_u128Value) \
     1255    iemMemStoreDataU128AlignedSseJmp(pVCpu, UINT8_MAX, (a_GCPtrMem), (a_u128Value))
    11361256#endif
    11371257
    … …  
    11461266# define IEM_MC_STORE_MEM_U256_ALIGN_AVX(a_iSeg, a_GCPtrMem, a_u256Value) \
    11471267    iemMemStoreDataU256AlignedAvxJmp(pVCpu, (a_iSeg), (a_GCPtrMem), &(a_u256Value))
     1268
     1269# define IEM_MC_STORE_MEM_FLAT_U256(a_GCPtrMem, a_u256Value) \
     1270    iemMemStoreDataU256Jmp(pVCpu, UINT8_MAX, (a_GCPtrMem), &(a_u256Value))
     1271# define IEM_MC_STORE_MEM_FLAT_U256_ALIGN_AVX(a_GCPtrMem, a_u256Value) \
     1272    iemMemStoreDataU256AlignedAvxJmp(pVCpu, UINT8_MAX, (a_GCPtrMem), &(a_u256Value))
    11481273#endif
    11491274
    1150 
     1275/* Regular stack push and pop: */
    11511276#define IEM_MC_PUSH_U16(a_u16Value) \
    11521277    IEM_MC_RETURN_ON_FAILURE(iemMemStackPushU16(pVCpu, (a_u16Value)))
    … …  
    11721297    IEM_MC_RETURN_ON_FAILURE(iemMemStackPopU64(pVCpu, (a_pu64Value)))
    11731298
     1299/* Flat stack push and pop: */
     1300#define IEM_MC_FLAT_PUSH_U16(a_u16Value) \
     1301    IEM_MC_RETURN_ON_FAILURE(iemMemStackPushU16(pVCpu, (a_u16Value)))
     1302#define IEM_MC_FLAT_PUSH_U32(a_u32Value) \
     1303    IEM_MC_RETURN_ON_FAILURE(iemMemStackPushU32(pVCpu, (a_u32Value)))
     1304#define IEM_MC_FLAT_PUSH_U32_SREG(a_u32Value) \
     1305    IEM_MC_RETURN_ON_FAILURE(iemMemStackPushU32SReg(pVCpu, (a_u32Value)))
     1306#define IEM_MC_FLAT_PUSH_U64(a_u64Value) \
     1307    IEM_MC_RETURN_ON_FAILURE(iemMemStackPushU64(pVCpu, (a_u64Value)))
     1308
     1309#define IEM_MC_FLAT_POP_U16(a_pu16Value) \
     1310    IEM_MC_RETURN_ON_FAILURE(iemMemStackPopU16(pVCpu, (a_pu16Value)))
     1311#define IEM_MC_FLAT_POP_U32(a_pu32Value) \
     1312    IEM_MC_RETURN_ON_FAILURE(iemMemStackPopU32(pVCpu, (a_pu32Value)))
     1313#define IEM_MC_FLAT_POP_U64(a_pu64Value) \
     1314    IEM_MC_RETURN_ON_FAILURE(iemMemStackPopU64(pVCpu, (a_pu64Value)))
     1315
     1316#define IEM_MC_FLAT_POP_EX_U16(a_pu16Value, a_) \
     1317    IEM_MC_RETURN_ON_FAILURE(iemMemStackPopU16Ex(pVCpu, (a_pu16Value), (a_pNewRsp)))
     1318#define IEM_MC_FLAT_POP_EX_U32(a_pu32Value) \
     1319    IEM_MC_RETURN_ON_FAILURE(iemMemStackPopU32(pVCpu, (a_pu32Value)))
     1320#define IEM_MC_FLAT_POP_EX_U64(a_pu64Value) \
     1321    IEM_MC_RETURN_ON_FAILURE(iemMemStackPopU64(pVCpu, (a_pu64Value)))
     1322
     1323
    11741324/** Maps guest memory for direct or bounce buffered access.
    11751325 * The purpose is to pass it to an operand implementation, thus the a_iArg.
    … …  
    11801330                                       (a_GCPtrMem), (a_fAccess), sizeof(*(a_pMem)) - 1))
    11811331
     1332/** Flat variant of IEM_MC_MEM_MAP. */
     1333#define IEM_MC_MEM_FLAT_MAP(a_pMem, a_fAccess, a_GCPtrMem, a_iArg) \
     1334    IEM_MC_RETURN_ON_FAILURE(iemMemMap(pVCpu, (void **)&(a_pMem), sizeof(*(a_pMem)), UINT8_MAX, \
     1335                                       (a_GCPtrMem), (a_fAccess), sizeof(*(a_pMem)) - 1))
     1336
    11821337/** Maps guest memory for direct or bounce buffered access.
    11831338 * The purpose is to pass it to an operand implementation, thus the a_iArg.
    … …  
    11861341#define IEM_MC_MEM_MAP_EX(a_pvMem, a_fAccess, a_cbMem, a_iSeg, a_GCPtrMem, a_cbAlign, a_iArg) \
    11871342    IEM_MC_RETURN_ON_FAILURE(iemMemMap(pVCpu, (void **)&(a_pvMem), (a_cbMem), (a_iSeg), \
     1343                                       (a_GCPtrMem), (a_fAccess), (a_cbAlign)))
     1344
     1345/** Flat variant of IEM_MC_MEM_MAP_EX. */
     1346#define IEM_MC_MEM_FLAT_MAP_EX(a_pvMem, a_fAccess, a_cbMem, a_GCPtrMem, a_cbAlign, a_iArg) \
     1347    IEM_MC_RETURN_ON_FAILURE(iemMemMap(pVCpu, (void **)&(a_pvMem), (a_cbMem), UINT8_MAX, \
    11881348                                       (a_GCPtrMem), (a_fAccess), (a_cbAlign)))
    11891349
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