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JOSCR, Jazelle OS Control Register

The JOSCR characteristics are:

Purpose

A Jazelle register, which provides operating system control of the Jazelle Extension.

Configuration

This register is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to JOSCR are UNKNOWN.

Attributes

JOSCR is a 32-bit register.

Field descriptions

The JOSCR 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
RAZ/WI

Bits [31:0]

Reserved, RAZ/WI.

Accessing the JOSCR

Accesses to this register use the following encodings:

MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coproc	opc1	CRn	CRm	opc2
0b1110	0b111	0b0001	0b0000	0b000

if PSTATE.EL == EL0 then
    if boolean IMPLEMENTATION_DEFINED "JOSCR UNDEFINED at EL0" then
        UNDEFINED;
    else
        return JOSCR;
elsif PSTATE.EL == EL1 then
    return JOSCR;
elsif PSTATE.EL == EL2 then
    return JOSCR;
elsif PSTATE.EL == EL3 then
    return JOSCR;

MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coproc	opc1	CRn	CRm	opc2
0b1110	0b111	0b0001	0b0000	0b000

if PSTATE.EL == EL0 then
    if boolean IMPLEMENTATION_DEFINED "JOSCR 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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