AMCGCR, Activity Monitors Counter Group Configuration Register
The AMCGCR characteristics are:
Purpose
Provides information on the number of activity monitor event counters implemented within each counter group.
Configuration
AArch32 System register AMCGCR bits [31:0] are architecturally mapped to AArch64 System register AMCGCR_EL0[31:0] .
AArch32 System register AMCGCR bits [31:0] are architecturally mapped to External register AMCGCR[31:0] .
This register is present only when AMUv1 is implemented. Otherwise, direct accesses to AMCGCR are UNDEFINED.
Attributes
AMCGCR is a 32-bit register.
Field descriptions
The AMCGCR bit assignments are:
Bits [31:16]
Reserved, RES0.
CG1NC, bits [15:8]
Counter Group 1 Number of Counters. The number of counters in the auxiliary counter group.
In AMUv1, the permitted range of values is 0 to 16.
CG0NC, bits [7:0]
Counter Group 0 Number of Counters. The number of counters in the architected counter group.
In AMUv1, the value of this field is 4.
Accessing the AMCGCR
Accesses to this register use the following encodings:
MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| opc1 | opc2 | CRn | coproc | CRm |
|---|---|---|---|---|
| 0b000 | 0b010 | 0b1101 | 0b1111 | 0b0010 |
if PSTATE.EL == EL0 then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> != '11' && HSTR_EL2.T13 == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T13 == '1' then
AArch32.TakeHypTrapException(0x03);
elsif !ELUsingAArch32(EL1) && AMUSERENR_EL0.EN == '0' then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
else
AArch64.AArch32SystemAccessTrap(EL1, 0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && CPTR_EL2.TAM == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TAM == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x03);
else
return AMCGCR;
elsif PSTATE.EL == EL1 then
if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T13 == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T13 == '1' then
AArch32.TakeHypTrapException(0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && CPTR_EL2.TAM == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TAM == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x03);
else
return AMCGCR;
elsif PSTATE.EL == EL2 then
if HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TAM == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x03);
else
return AMCGCR;
elsif PSTATE.EL == EL3 then
return AMCGCR;