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Version 1.10 12/01/02 J-1
Appendix J
EFI Byte Code Virtual Machine
Opcode Summary
The following table lists the opcodes for EBC instructions. Note that opcodes only require 6 bits of
the opcode byte of EBC instructions. The other two bits are used for other encodings that are
dependent on the particular instruction.
Table J-1. EBC Virtual Machine Opcode Summary
Opcode Description
0x00 BREAK [break code]
0x01 JMP32{cs|cc} {@}R
1
{Immed32|Index32}
JMP
64{cs|cc} Immed64
0x02 JMP8{cs|cc} Immed8
0x03 CALL32{EX}{a} {@}R
1
{Immed32|Index32}
CALL
64{EX}{a} Immed64
0x04 RET
0x05 CMP[32|64]eq R
1,
{@}R
2
{Index16|Immed16}
0x06 CMP[32|64]lte R
1,
{@}R
2
{Index16|Immed16}
0x07 CMP[32|64]gte R
1,
{@}R
2
{Index16|Immed16}
0x08 CMP[32|64]ulte R
1,
{@}R
2
{Index16|Immed16}
0x09 CMP[32|64]ugte R
1,
{@}R
2
{Index16|Immed16}
0x0A NOT[32|64] {@}R
1
, {@}R
2
{Index16|Immed16}
0x0B NEG[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x0C ADD[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x0D SUB[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x0E MUL[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x0F MULU[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x10 DIV[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x11 DIVU[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x12 MOD[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x13 MODU[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x14 AND[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x15 OR[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x16 XOR[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x17 SHL[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x18 SHR[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
0x19 ASHR[32|64] {@}R
1
,{@}R
2
{Index16|Immed16}
continued