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JMCR, Jazelle Main Configuration Register
The JMCR characteristics are:
Purpose
A Jazelle register, which provides control of the Jazelle extension.
Configuration
Attributes
JMCR is a 32-bit register.
Field descriptions
The JMCR bit assignments are:
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bits [31:0]
RAZ/WI at EL1, EL2, and EL3. It is IMPLEMENTATION DEFINED whether this field is RAZ/WI or UNDEFINED at EL0.
Accessing the JMCR
For accesses from EL0 it is IMPLEMENTATION DEFINED whether the register is RW or UNDEFINED.
Accesses to this register use the following encodings:
MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
opc1 | opc2 | CRn | coproc | CRm |
---|---|---|---|---|
0b111 | 0b000 | 0b0010 | 0b1110 | 0b0000 |
if PSTATE.EL == EL0 then if boolean IMPLEMENTATION_DEFINED "JMCR UNDEFINED at EL0" then UNDEFINED; else return JMCR; elsif PSTATE.EL == EL1 then return JMCR; elsif PSTATE.EL == EL2 then return JMCR; elsif PSTATE.EL == EL3 then return JMCR;
MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
opc1 | opc2 | CRn | coproc | CRm |
---|---|---|---|---|
0b111 | 0b000 | 0b0010 | 0b1110 | 0b0000 |
if PSTATE.EL == EL0 then if boolean IMPLEMENTATION_DEFINED "JMCR UNDEFINED at EL0" then UNDEFINED; else //no operation elsif PSTATE.EL == EL1 then //no operation elsif PSTATE.EL == EL2 then //no operation elsif PSTATE.EL == EL3 then //no operation