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Add a bitfield to decode based on what prefixes are used.

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--HG--
extra : convert_revision : 7ff4998b3249ccfe86ae9cbcc63fb910683707f5
This commit is contained in:
Gabe Black 2007-07-20 14:57:04 -07:00
parent dcfaa348b1
commit 5d882984d1
2 changed files with 5 additions and 3 deletions
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3
src/arch/x86/isa/bitfields.isa
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@ -67,11 +67,12 @@ def bitfield REX_B rex.b;
//Legacy prefixes
def bitfield LEGACY legacy;
def bitfield LEGACY_DECODEVAL legacy.decodeVal;
def bitfield LEGACY_REPNE legacy.repne;
def bitfield LEGACY_REP legacy.rep;
def bitfield LEGACY_LOCK legacy.lock;
def bitfield LEGACY_ADDR legacy.addr;
def bitfield LEGACY_OP legacy.op;
def bitfield LEGACY_ADDR legacy.addr;
def bitfield LEGACY_SEG legacy.seg;
// Pieces of the opcode

5
src/arch/x86/types.hh
View file

@ -86,11 +86,12 @@ namespace X86ISA
};
BitUnion8(LegacyPrefixVector)
Bitfield<7, 4> decodeVal;
Bitfield<7> repne;
Bitfield<6> rep;
Bitfield<5> lock;
Bitfield<4> addr;
Bitfield<3> op;
Bitfield<4> op;
Bitfield<3> addr;
//There can be only one segment override, so they share the
//first 3 bits in the legacyPrefixes bitfield.
Bitfield<2,0> seg;