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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:

313029282726252423222120191817161514131211109876543210
00000000000000000000000000000000

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>}

opc1opc2CRncoprocCRm
0b1110b0000b00100b11100b0000
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>}

opc1opc2CRncoprocCRm
0b1110b0000b00100b11100b0000
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


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