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gem5 / public / gem5 / 770f4704959887557a2484a7eecc94047c8fa087 / . / src / dev / arm / gic_v3_cpu_interface.cc
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/*
* Copyright (c) 2019, 2021-2022 Arm Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2018 Metempsy Technology Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "dev/arm/gic_v3_cpu_interface.hh"
#include "arch/arm/faults.hh"
#include "arch/arm/isa.hh"
#include "debug/GIC.hh"
#include "dev/arm/gic_v3.hh"
#include "dev/arm/gic_v3_distributor.hh"
#include "dev/arm/gic_v3_redistributor.hh"
namespace gem5
{
using namespace ArmISA;
const uint8_t Gicv3CPUInterface::GIC_MIN_BPR;
const uint8_t Gicv3CPUInterface::GIC_MIN_BPR_NS;
Gicv3CPUInterface::Gicv3CPUInterface(Gicv3 * gic, uint32_t cpu_id)
: BaseISADevice(),
gic(gic),
redistributor(nullptr),
distributor(nullptr),
cpuId(cpu_id)
{
hppi.prio = 0xff;
hppi.intid = Gicv3::INTID_SPURIOUS;
}
void
Gicv3CPUInterface::init()
{
redistributor = gic->getRedistributor(cpuId);
distributor = gic->getDistributor();
}
void
Gicv3CPUInterface::resetHppi(uint32_t intid)
{
if (intid == hppi.intid)
hppi.prio = 0xff;
}
void
Gicv3CPUInterface::setThreadContext(ThreadContext *tc)
{
maintenanceInterrupt = gic->params().maint_int->get(tc);
fatal_if(maintenanceInterrupt->num() >= redistributor->irqPending.size(),
"Invalid maintenance interrupt number\n");
}
bool
Gicv3CPUInterface::getHCREL2FMO() const
{
HCR hcr = isa->readMiscRegNoEffect(MISCREG_HCR_EL2);
if (hcr.tge && hcr.e2h) {
return false;
} else if (hcr.tge) {
return true;
} else {
return hcr.fmo;
}
}
bool
Gicv3CPUInterface::getHCREL2IMO() const
{
HCR hcr = isa->readMiscRegNoEffect(MISCREG_HCR_EL2);
if (hcr.tge && hcr.e2h) {
return false;
} else if (hcr.tge) {
return true;
} else {
return hcr.imo;
}
}
RegVal
Gicv3CPUInterface::readMiscReg(int misc_reg)
{
RegVal value = isa->readMiscRegNoEffect(misc_reg);
bool hcr_fmo = getHCREL2FMO();
bool hcr_imo = getHCREL2IMO();
switch (misc_reg) {
// Active Priorities Group 1 Registers
case MISCREG_ICC_AP1R0:
case MISCREG_ICC_AP1R0_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_imo) {
return isa->readMiscRegNoEffect(MISCREG_ICV_AP1R0_EL1);
}
return readBankedMiscReg(MISCREG_ICC_AP1R0_EL1);
}
case MISCREG_ICC_AP1R1:
case MISCREG_ICC_AP1R1_EL1:
// only implemented if supporting 6 or more bits of priority
case MISCREG_ICC_AP1R2:
case MISCREG_ICC_AP1R2_EL1:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICC_AP1R3:
case MISCREG_ICC_AP1R3_EL1:
// only implemented if supporting 7 or more bits of priority
return 0;
// Active Priorities Group 0 Registers
case MISCREG_ICC_AP0R0:
case MISCREG_ICC_AP0R0_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_fmo) {
return isa->readMiscRegNoEffect(MISCREG_ICV_AP0R0_EL1);
}
break;
}
case MISCREG_ICC_AP0R1:
case MISCREG_ICC_AP0R1_EL1:
// only implemented if supporting 6 or more bits of priority
case MISCREG_ICC_AP0R2:
case MISCREG_ICC_AP0R2_EL1:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICC_AP0R3:
case MISCREG_ICC_AP0R3_EL1:
// only implemented if supporting 7 or more bits of priority
return 0;
// Interrupt Group 0 Enable register EL1
case MISCREG_ICC_IGRPEN0:
case MISCREG_ICC_IGRPEN0_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_fmo) {
return readMiscReg(MISCREG_ICV_IGRPEN0_EL1);
}
break;
}
case MISCREG_ICV_IGRPEN0_EL1: {
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
value = ich_vmcr_el2.VENG0;
break;
}
// Interrupt Group 1 Enable register EL1
case MISCREG_ICC_IGRPEN1:
case MISCREG_ICC_IGRPEN1_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_imo) {
return readMiscReg(MISCREG_ICV_IGRPEN1_EL1);
}
value = readBankedMiscReg(MISCREG_ICC_IGRPEN1_EL1);
break;
}
case MISCREG_ICV_IGRPEN1_EL1: {
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
value = ich_vmcr_el2.VENG1;
break;
}
// Interrupt Group 1 Enable register EL3
case MISCREG_ICC_MGRPEN1:
case MISCREG_ICC_IGRPEN1_EL3: {
ICC_IGRPEN1_EL3 igrp_el3 = 0;
igrp_el3.EnableGrp1S = ((ICC_IGRPEN1_EL1)isa->readMiscRegNoEffect(
MISCREG_ICC_IGRPEN1_EL1_S)).Enable;
igrp_el3.EnableGrp1NS = ((ICC_IGRPEN1_EL1)isa->readMiscRegNoEffect(
MISCREG_ICC_IGRPEN1_EL1_NS)).Enable;
value = igrp_el3;
break;
}
// Running Priority Register
case MISCREG_ICC_RPR:
case MISCREG_ICC_RPR_EL1: {
if ((currEL() == EL1) && !inSecureState() &&
(hcr_imo || hcr_fmo)) {
return readMiscReg(MISCREG_ICV_RPR_EL1);
}
uint8_t rprio = highestActivePriority();
if (haveEL(EL3) && !inSecureState() &&
(isa->readMiscRegNoEffect(MISCREG_SCR_EL3) & (1U << 2))) {
// Spec section 4.8.1
// For Non-secure access to ICC_RPR_EL1 when SCR_EL3.FIQ == 1
if ((rprio & 0x80) == 0) {
// If the current priority mask value is in the range of
// 0x00-0x7F a read access returns the value 0x0
rprio = 0;
} else if (rprio != 0xff) {
// If the current priority mask value is in the range of
// 0x80-0xFF a read access returns the Non-secure read of
// the current value
rprio = (rprio << 1) & 0xff;
}
}
value = rprio;
break;
}
// Virtual Running Priority Register
case MISCREG_ICV_RPR_EL1: {
value = virtualHighestActivePriority();
break;
}
// Highest Priority Pending Interrupt Register 0
case MISCREG_ICC_HPPIR0:
case MISCREG_ICC_HPPIR0_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_fmo) {
return readMiscReg(MISCREG_ICV_HPPIR0_EL1);
}
value = getHPPIR0();
break;
}
// Virtual Highest Priority Pending Interrupt Register 0
case MISCREG_ICV_HPPIR0_EL1: {
value = Gicv3::INTID_SPURIOUS;
int lr_idx = getHPPVILR();
if (lr_idx >= 0) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
Gicv3::GroupId group =
ich_lr_el2.Group ? Gicv3::G1NS : Gicv3::G0S;
if (group == Gicv3::G0S) {
value = ich_lr_el2.vINTID;
}
}
break;
}
// Highest Priority Pending Interrupt Register 1
case MISCREG_ICC_HPPIR1:
case MISCREG_ICC_HPPIR1_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_imo) {
return readMiscReg(MISCREG_ICV_HPPIR1_EL1);
}
value = getHPPIR1();
break;
}
// Virtual Highest Priority Pending Interrupt Register 1
case MISCREG_ICV_HPPIR1_EL1: {
value = Gicv3::INTID_SPURIOUS;
int lr_idx = getHPPVILR();
if (lr_idx >= 0) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
Gicv3::GroupId group =
ich_lr_el2.Group ? Gicv3::G1NS : Gicv3::G0S;
if (group == Gicv3::G1NS) {
value = ich_lr_el2.vINTID;
}
}
break;
}
// Binary Point Register 0
case MISCREG_ICC_BPR0:
case MISCREG_ICC_BPR0_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_fmo) {
return readMiscReg(MISCREG_ICV_BPR0_EL1);
}
value = isa->readMiscRegNoEffect(MISCREG_ICC_BPR0_EL1);
break;
}
// Binary Point Register 1
case MISCREG_ICC_BPR1:
case MISCREG_ICC_BPR1_EL1: {
value = bpr1(isSecureBelowEL3() ? Gicv3::G1S : Gicv3::G1NS);
break;
}
// Virtual Binary Point Register 0
case MISCREG_ICV_BPR0_EL1: {
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
value = ich_vmcr_el2.VBPR0;
break;
}
// Virtual Binary Point Register 1
case MISCREG_ICV_BPR1_EL1: {
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
if (ich_vmcr_el2.VCBPR) {
// bpr0 + 1 saturated to 7, WI
value = ich_vmcr_el2.VBPR0 + 1;
value = value < 7 ? value : 7;
} else {
value = ich_vmcr_el2.VBPR1;
}
break;
}
// Interrupt Priority Mask Register
case MISCREG_ICC_PMR:
case MISCREG_ICC_PMR_EL1:
if ((currEL() == EL1) && !inSecureState() && (hcr_imo || hcr_fmo)) {
return readMiscReg(MISCREG_ICV_PMR_EL1);
}
if (haveEL(EL3) && !inSecureState() &&
(isa->readMiscRegNoEffect(MISCREG_SCR_EL3) & (1U << 2))) {
// Spec section 4.8.1
// For Non-secure access to ICC_PMR_EL1 when SCR_EL3.FIQ == 1:
if ((value & 0x80) == 0) {
// If the current priority mask value is in the range of
// 0x00-0x7F a read access returns the value 0x00.
value = 0;
} else if (value != 0xff) {
// If the current priority mask value is in the range of
// 0x80-0xFF a read access returns the Non-secure read of the
// current value.
value = (value << 1) & 0xff;
}
}
break;
case MISCREG_ICV_PMR_EL1: { // Priority Mask Register
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
value = ich_vmcr_el2.VPMR;
break;
}
// Interrupt Acknowledge Register 0
case MISCREG_ICC_IAR0:
case MISCREG_ICC_IAR0_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_fmo) {
return readMiscReg(MISCREG_ICV_IAR0_EL1);
}
uint32_t int_id;
if (hppiCanPreempt()) {
int_id = getHPPIR0();
// avoid activation for special interrupts
if (int_id < Gicv3::INTID_SECURE ||
int_id >= Gicv3Redistributor::SMALLEST_LPI_ID) {
activateIRQ(int_id, hppi.group);
}
} else {
int_id = Gicv3::INTID_SPURIOUS;
}
value = int_id;
break;
}
// Virtual Interrupt Acknowledge Register 0
case MISCREG_ICV_IAR0_EL1: {
int lr_idx = getHPPVILR();
uint32_t int_id = Gicv3::INTID_SPURIOUS;
if (lr_idx >= 0) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
if (!ich_lr_el2.Group && hppviCanPreempt(lr_idx)) {
int_id = ich_lr_el2.vINTID;
if (int_id < Gicv3::INTID_SECURE ||
int_id > Gicv3::INTID_SPURIOUS) {
virtualActivateIRQ(lr_idx);
} else {
// Bogus... Pseudocode says:
// - Move from pending to invalid...
// - Return de bogus id...
ich_lr_el2.State = ICH_LR_EL2_STATE_INVALID;
isa->setMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx,
ich_lr_el2);
}
}
}
value = int_id;
virtualUpdate();
break;
}
// Interrupt Acknowledge Register 1
case MISCREG_ICC_IAR1:
case MISCREG_ICC_IAR1_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_imo) {
return readMiscReg(MISCREG_ICV_IAR1_EL1);
}
uint32_t int_id;
if (hppiCanPreempt()) {
int_id = getHPPIR1();
// avoid activation for special interrupts
if (int_id < Gicv3::INTID_SECURE ||
int_id >= Gicv3Redistributor::SMALLEST_LPI_ID) {
activateIRQ(int_id, hppi.group);
}
} else {
int_id = Gicv3::INTID_SPURIOUS;
}
value = int_id;
break;
}
// Virtual Interrupt Acknowledge Register 1
case MISCREG_ICV_IAR1_EL1: {
int lr_idx = getHPPVILR();
uint32_t int_id = Gicv3::INTID_SPURIOUS;
if (lr_idx >= 0) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
if (ich_lr_el2.Group && hppviCanPreempt(lr_idx)) {
int_id = ich_lr_el2.vINTID;
if (int_id < Gicv3::INTID_SECURE ||
int_id > Gicv3::INTID_SPURIOUS) {
virtualActivateIRQ(lr_idx);
} else {
// Bogus... Pseudocode says:
// - Move from pending to invalid...
// - Return de bogus id...
ich_lr_el2.State = ICH_LR_EL2_STATE_INVALID;
isa->setMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx,
ich_lr_el2);
}
}
}
value = int_id;
virtualUpdate();
break;
}
// System Register Enable Register EL1
case MISCREG_ICC_SRE:
case MISCREG_ICC_SRE_EL1: {
/*
* DIB [2] == 1 (IRQ bypass not supported, RAO/WI)
* DFB [1] == 1 (FIQ bypass not supported, RAO/WI)
* SRE [0] == 1 (Only system register interface supported, RAO/WI)
*/
ICC_SRE_EL1 icc_sre_el1 = 0;
icc_sre_el1.SRE = 1;
icc_sre_el1.DIB = 1;
icc_sre_el1.DFB = 1;
value = icc_sre_el1;
break;
}
// System Register Enable Register EL2
case MISCREG_ICC_HSRE:
case MISCREG_ICC_SRE_EL2: {
/*
* Enable [3] == 1
* (EL1 accesses to ICC_SRE_EL1 do not trap to EL2, RAO/WI)
* DIB [2] == 1 (IRQ bypass not supported, RAO/WI)
* DFB [1] == 1 (FIQ bypass not supported, RAO/WI)
* SRE [0] == 1 (Only system register interface supported, RAO/WI)
*/
ICC_SRE_EL2 icc_sre_el2 = 0;
icc_sre_el2.SRE = 1;
icc_sre_el2.DIB = 1;
icc_sre_el2.DFB = 1;
icc_sre_el2.Enable = 1;
value = icc_sre_el2;
break;
}
// System Register Enable Register EL3
case MISCREG_ICC_MSRE:
case MISCREG_ICC_SRE_EL3: {
/*
* Enable [3] == 1
* (EL1 accesses to ICC_SRE_EL1 do not trap to EL3.
* EL2 accesses to ICC_SRE_EL1 and ICC_SRE_EL2 do not trap to EL3.
* RAO/WI)
* DIB [2] == 1 (IRQ bypass not supported, RAO/WI)
* DFB [1] == 1 (FIQ bypass not supported, RAO/WI)
* SRE [0] == 1 (Only system register interface supported, RAO/WI)
*/
ICC_SRE_EL3 icc_sre_el3 = 0;
icc_sre_el3.SRE = 1;
icc_sre_el3.DIB = 1;
icc_sre_el3.DFB = 1;
icc_sre_el3.Enable = 1;
value = icc_sre_el3;
break;
}
// Control Register
case MISCREG_ICC_CTLR:
case MISCREG_ICC_CTLR_EL1: {
if ((currEL() == EL1) && !inSecureState() && (hcr_imo || hcr_fmo)) {
return readMiscReg(MISCREG_ICV_CTLR_EL1);
}
value = readBankedMiscReg(MISCREG_ICC_CTLR_EL1);
// Enforce value for RO bits
// ExtRange [19], INTIDs in the range 1024..8191 not supported
// RSS [18], SGIs with affinity level 0 values of 0-255 are supported
// A3V [15], supports non-zero values of the Aff3 field in SGI
// generation System registers
// SEIS [14], does not support generation of SEIs (deprecated)
// IDbits [13:11], 001 = 24 bits | 000 = 16 bits
// PRIbits [10:8], number of priority bits implemented, minus one
ICC_CTLR_EL1 icc_ctlr_el1 = value;
icc_ctlr_el1.ExtRange = 0;
icc_ctlr_el1.RSS = 1;
icc_ctlr_el1.A3V = 1;
icc_ctlr_el1.SEIS = 0;
icc_ctlr_el1.IDbits = 1;
icc_ctlr_el1.PRIbits = PRIORITY_BITS - 1;
value = icc_ctlr_el1;
break;
}
// Virtual Control Register
case MISCREG_ICV_CTLR_EL1: {
ICV_CTLR_EL1 icv_ctlr_el1 = value;
icv_ctlr_el1.RSS = 0;
icv_ctlr_el1.A3V = 1;
icv_ctlr_el1.SEIS = 0;
icv_ctlr_el1.IDbits = 1;
icv_ctlr_el1.PRIbits = 7;
value = icv_ctlr_el1;
break;
}
// Control Register
case MISCREG_ICC_MCTLR:
case MISCREG_ICC_CTLR_EL3: {
// Enforce value for RO bits
// ExtRange [19], INTIDs in the range 1024..8191 not supported
// RSS [18], SGIs with affinity level 0 values of 0-255 are supported
// nDS [17], supports disabling of security
// A3V [15], supports non-zero values of the Aff3 field in SGI
// generation System registers
// SEIS [14], does not support generation of SEIs (deprecated)
// IDbits [13:11], 001 = 24 bits | 000 = 16 bits
// PRIbits [10:8], number of priority bits implemented, minus one
ICC_CTLR_EL3 icc_ctlr_el3 = value;
icc_ctlr_el3.ExtRange = 0;
icc_ctlr_el3.RSS = 1;
icc_ctlr_el3.nDS = 0;
icc_ctlr_el3.A3V = 1;
icc_ctlr_el3.SEIS = 0;
icc_ctlr_el3.IDbits = 0;
icc_ctlr_el3.PRIbits = PRIORITY_BITS - 1;
value = icc_ctlr_el3;
break;
}
// Hyp Control Register
case MISCREG_ICH_HCR:
case MISCREG_ICH_HCR_EL2:
break;
// Hyp Active Priorities Group 0 Registers
case MISCREG_ICH_AP0R0:
case MISCREG_ICH_AP0R0_EL2:
break;
// only implemented if supporting 6 or more bits of priority
case MISCREG_ICH_AP0R1:
case MISCREG_ICH_AP0R1_EL2:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICH_AP0R2:
case MISCREG_ICH_AP0R2_EL2:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICH_AP0R3:
case MISCREG_ICH_AP0R3_EL2:
// Unimplemented registers are RAZ/WI
return 0;
// Hyp Active Priorities Group 1 Registers
case MISCREG_ICH_AP1R0:
case MISCREG_ICH_AP1R0_EL2:
break;
// only implemented if supporting 6 or more bits of priority
case MISCREG_ICH_AP1R1:
case MISCREG_ICH_AP1R1_EL2:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICH_AP1R2:
case MISCREG_ICH_AP1R2_EL2:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICH_AP1R3:
case MISCREG_ICH_AP1R3_EL2:
// Unimplemented registers are RAZ/WI
return 0;
// Maintenance Interrupt State Register
case MISCREG_ICH_MISR:
case MISCREG_ICH_MISR_EL2:
value = maintenanceInterruptStatus();
break;
// VGIC Type Register
case MISCREG_ICH_VTR:
case MISCREG_ICH_VTR_EL2: {
ICH_VTR_EL2 ich_vtr_el2 = value;
ich_vtr_el2.ListRegs = VIRTUAL_NUM_LIST_REGS - 1;
ich_vtr_el2.A3V = 1;
ich_vtr_el2.IDbits = 1;
ich_vtr_el2.PREbits = VIRTUAL_PREEMPTION_BITS - 1;
ich_vtr_el2.PRIbits = VIRTUAL_PRIORITY_BITS - 1;
value = ich_vtr_el2;
break;
}
// End of Interrupt Status Register
case MISCREG_ICH_EISR:
case MISCREG_ICH_EISR_EL2:
value = eoiMaintenanceInterruptStatus();
break;
// Empty List Register Status Register
case MISCREG_ICH_ELRSR:
case MISCREG_ICH_ELRSR_EL2:
value = 0;
for (int lr_idx = 0; lr_idx < VIRTUAL_NUM_LIST_REGS; lr_idx++) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
if ((ich_lr_el2.State == ICH_LR_EL2_STATE_INVALID) &&
(ich_lr_el2.HW || !ich_lr_el2.EOI)) {
value |= (1 << lr_idx);
}
}
break;
// List Registers
case MISCREG_ICH_LRC0 ... MISCREG_ICH_LRC15:
// AArch32 (maps to AArch64 MISCREG_ICH_LR<n>_EL2 high half part)
value = value >> 32;
break;
// List Registers
case MISCREG_ICH_LR0 ... MISCREG_ICH_LR15:
// AArch32 (maps to AArch64 MISCREG_ICH_LR<n>_EL2 low half part)
value = value & 0xffffffff;
break;
// List Registers
case MISCREG_ICH_LR0_EL2 ... MISCREG_ICH_LR15_EL2:
break;
// Virtual Machine Control Register
case MISCREG_ICH_VMCR:
case MISCREG_ICH_VMCR_EL2:
break;
default:
panic("Gicv3CPUInterface::readMiscReg(): unknown register %d (%s)",
misc_reg, miscRegName[misc_reg]);
}
DPRINTF(GIC, "Gicv3CPUInterface::readMiscReg(): register %s value %#x\n",
miscRegName[misc_reg], value);
return value;
}
void
Gicv3CPUInterface::setMiscReg(int misc_reg, RegVal val)
{
bool do_virtual_update = false;
DPRINTF(GIC, "Gicv3CPUInterface::setMiscReg(): register %s value %#x\n",
miscRegName[misc_reg], val);
bool hcr_fmo = getHCREL2FMO();
bool hcr_imo = getHCREL2IMO();
switch (misc_reg) {
// Active Priorities Group 1 Registers
case MISCREG_ICC_AP1R0:
case MISCREG_ICC_AP1R0_EL1:
if ((currEL() == EL1) && !inSecureState() && hcr_imo) {
return isa->setMiscRegNoEffect(MISCREG_ICV_AP1R0_EL1, val);
}
setBankedMiscReg(MISCREG_ICC_AP1R0_EL1, val);
return;
case MISCREG_ICC_AP1R1:
case MISCREG_ICC_AP1R1_EL1:
// only implemented if supporting 6 or more bits of priority
case MISCREG_ICC_AP1R2:
case MISCREG_ICC_AP1R2_EL1:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICC_AP1R3:
case MISCREG_ICC_AP1R3_EL1:
// only implemented if supporting 7 or more bits of priority
break;
// Active Priorities Group 0 Registers
case MISCREG_ICC_AP0R0:
case MISCREG_ICC_AP0R0_EL1:
if ((currEL() == EL1) && !inSecureState() && hcr_fmo) {
return isa->setMiscRegNoEffect(MISCREG_ICV_AP0R0_EL1, val);
}
break;
case MISCREG_ICC_AP0R1:
case MISCREG_ICC_AP0R1_EL1:
// only implemented if supporting 6 or more bits of priority
case MISCREG_ICC_AP0R2:
case MISCREG_ICC_AP0R2_EL1:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICC_AP0R3:
case MISCREG_ICC_AP0R3_EL1:
// only implemented if supporting 7 or more bits of priority
break;
// End Of Interrupt Register 0
case MISCREG_ICC_EOIR0:
case MISCREG_ICC_EOIR0_EL1: { // End Of Interrupt Register 0
if ((currEL() == EL1) && !inSecureState() && hcr_fmo) {
return setMiscReg(MISCREG_ICV_EOIR0_EL1, val);
}
int int_id = val & 0xffffff;
// avoid activation for special interrupts
if (int_id >= Gicv3::INTID_SECURE &&
int_id <= Gicv3::INTID_SPURIOUS) {
return;
}
Gicv3::GroupId group = Gicv3::G0S;
if (highestActiveGroup() != group) {
return;
}
dropPriority(group);
if (!isEOISplitMode()) {
deactivateIRQ(int_id, group);
}
break;
}
// Virtual End Of Interrupt Register 0
case MISCREG_ICV_EOIR0_EL1: {
int int_id = val & 0xffffff;
// avoid deactivation for special interrupts
if (int_id >= Gicv3::INTID_SECURE &&
int_id <= Gicv3::INTID_SPURIOUS) {
return;
}
uint8_t drop_prio = virtualDropPriority();
if (drop_prio == 0xff) {
return;
}
int lr_idx = virtualFindActive(int_id);
if (lr_idx < 0) {
// No LR found matching
virtualIncrementEOICount();
} else {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
Gicv3::GroupId lr_group =
ich_lr_el2.Group ? Gicv3::G1NS : Gicv3::G0S;
uint8_t lr_group_prio = ich_lr_el2.Priority & 0xf8;
if (lr_group == Gicv3::G0S && lr_group_prio == drop_prio) {
//if (!virtualIsEOISplitMode())
{
virtualDeactivateIRQ(lr_idx);
}
}
}
virtualUpdate();
break;
}
// End Of Interrupt Register 1
case MISCREG_ICC_EOIR1:
case MISCREG_ICC_EOIR1_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_imo) {
return setMiscReg(MISCREG_ICV_EOIR1_EL1, val);
}
int int_id = val & 0xffffff;
// avoid deactivation for special interrupts
if (int_id >= Gicv3::INTID_SECURE &&
int_id <= Gicv3::INTID_SPURIOUS) {
return;
}
Gicv3::GroupId group = inSecureState() ? Gicv3::G1S : Gicv3::G1NS;
if (highestActiveGroup() == Gicv3::G0S) {
return;
}
if (distributor->DS == 0) {
if (highestActiveGroup() == Gicv3::G1S && !inSecureState()) {
return;
} else if (highestActiveGroup() == Gicv3::G1NS &&
!(!inSecureState() or (currEL() == EL3))) {
return;
}
}
dropPriority(group);
if (!isEOISplitMode()) {
deactivateIRQ(int_id, group);
}
break;
}
// Virtual End Of Interrupt Register 1
case MISCREG_ICV_EOIR1_EL1: {
int int_id = val & 0xffffff;
// avoid deactivation for special interrupts
if (int_id >= Gicv3::INTID_SECURE &&
int_id <= Gicv3::INTID_SPURIOUS) {
return;
}
uint8_t drop_prio = virtualDropPriority();
if (drop_prio == 0xff) {
return;
}
int lr_idx = virtualFindActive(int_id);
if (lr_idx < 0) {
// No matching LR found
virtualIncrementEOICount();
} else {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
Gicv3::GroupId lr_group =
ich_lr_el2.Group ? Gicv3::G1NS : Gicv3::G0S;
uint8_t lr_group_prio = ich_lr_el2.Priority & 0xf8;
if (lr_group == Gicv3::G1NS && lr_group_prio == drop_prio) {
if (!virtualIsEOISplitMode()) {
virtualDeactivateIRQ(lr_idx);
}
}
}
virtualUpdate();
break;
}
// Deactivate Interrupt Register
case MISCREG_ICC_DIR:
case MISCREG_ICC_DIR_EL1: {
if ((currEL() == EL1) && !inSecureState() &&
(hcr_imo || hcr_fmo)) {
return setMiscReg(MISCREG_ICV_DIR_EL1, val);
}
int int_id = val & 0xffffff;
// The following checks are as per spec pseudocode
// aarch64/support/ICC_DIR_EL1
// Check for spurious ID
if (int_id >= Gicv3::INTID_SECURE) {
return;
}
// EOI mode is not set, so don't deactivate
if (!isEOISplitMode()) {
return;
}
Gicv3::GroupId group =
int_id >= 32 ? distributor->getIntGroup(int_id) :
redistributor->getIntGroup(int_id);
bool irq_is_grp0 = group == Gicv3::G0S;
bool single_sec_state = distributor->DS;
bool irq_is_secure = !single_sec_state && (group != Gicv3::G1NS);
SCR scr_el3 = isa->readMiscRegNoEffect(MISCREG_SCR_EL3);
bool route_fiq_to_el3 = scr_el3.fiq;
bool route_irq_to_el3 = scr_el3.irq;
bool route_fiq_to_el2 = hcr_fmo;
bool route_irq_to_el2 = hcr_imo;
switch (currEL()) {
case EL3:
break;
case EL2:
if (single_sec_state && irq_is_grp0 && !route_fiq_to_el3) {
break;
}
if (!irq_is_secure && !irq_is_grp0 && !route_irq_to_el3) {
break;
}
return;
case EL1:
if (!isSecureBelowEL3()) {
if (single_sec_state && irq_is_grp0 &&
!route_fiq_to_el3 && !route_fiq_to_el2) {
break;
}
if (!irq_is_secure && !irq_is_grp0 &&
!route_irq_to_el3 && !route_irq_to_el2) {
break;
}
} else {
if (irq_is_grp0 && !route_fiq_to_el3) {
break;
}
if (!irq_is_grp0 &&
(!irq_is_secure || !single_sec_state) &&
!route_irq_to_el3) {
break;
}
}
return;
default:
break;
}
deactivateIRQ(int_id, group);
break;
}
// Deactivate Virtual Interrupt Register
case MISCREG_ICV_DIR_EL1: {
int int_id = val & 0xffffff;
// avoid deactivation for special interrupts
if (int_id >= Gicv3::INTID_SECURE &&
int_id <= Gicv3::INTID_SPURIOUS) {
return;
}
if (!virtualIsEOISplitMode()) {
return;
}
int lr_idx = virtualFindActive(int_id);
if (lr_idx < 0) {
// No matching LR found
virtualIncrementEOICount();
} else {
virtualDeactivateIRQ(lr_idx);
}
virtualUpdate();
break;
}
// Binary Point Register 0
case MISCREG_ICC_BPR0:
case MISCREG_ICC_BPR0_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_fmo) {
return setMiscReg(MISCREG_ICV_BPR0_EL1, val);
}
break;
}
// Binary Point Register 1
case MISCREG_ICC_BPR1:
case MISCREG_ICC_BPR1_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_imo) {
return setMiscReg(MISCREG_ICV_BPR1_EL1, val);
}
val &= 0x7;
if (isSecureBelowEL3()) {
// group == Gicv3::G1S
ICC_CTLR_EL1 icc_ctlr_el1_s =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_S);
val = val > GIC_MIN_BPR ? val : GIC_MIN_BPR;
if (haveEL(EL3) && !isEL3OrMon() && icc_ctlr_el1_s.CBPR) {
isa->setMiscRegNoEffect(MISCREG_ICC_BPR0_EL1, val);
} else {
isa->setMiscRegNoEffect(MISCREG_ICC_BPR1_EL1_S, val);
}
return;
} else {
// group == Gicv3::G1NS
ICC_CTLR_EL1 icc_ctlr_el1_ns =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_NS);
val = val > GIC_MIN_BPR_NS ? val : GIC_MIN_BPR_NS;
if (haveEL(EL3) && !isEL3OrMon() && icc_ctlr_el1_ns.CBPR) {
// Non secure writes from EL1 and EL2 are ignored
} else {
isa->setMiscRegNoEffect(MISCREG_ICC_BPR1_EL1_NS, val);
}
return;
}
break;
}
// Virtual Binary Point Register 0
case MISCREG_ICV_BPR0_EL1:
// Virtual Binary Point Register 1
case MISCREG_ICV_BPR1_EL1: {
Gicv3::GroupId group =
misc_reg == MISCREG_ICV_BPR0_EL1 ? Gicv3::G0S : Gicv3::G1NS;
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
if ((group == Gicv3::G1NS) && ich_vmcr_el2.VCBPR) {
// BPR0 + 1 saturated to 7, WI
return;
}
uint8_t min_VPBR = 7 - VIRTUAL_PREEMPTION_BITS;
if (group != Gicv3::G0S) {
min_VPBR++;
}
if (val < min_VPBR) {
val = min_VPBR;
}
if (group == Gicv3::G0S) {
ich_vmcr_el2.VBPR0 = val;
} else {
ich_vmcr_el2.VBPR1 = val;
}
isa->setMiscRegNoEffect(MISCREG_ICH_VMCR_EL2, ich_vmcr_el2);
do_virtual_update = true;
break;
}
// Control Register EL1
case MISCREG_ICC_CTLR:
case MISCREG_ICC_CTLR_EL1: {
if ((currEL() == EL1) && !inSecureState() && (hcr_imo || hcr_fmo)) {
return setMiscReg(MISCREG_ICV_CTLR_EL1, val);
}
/*
* ExtRange is RO.
* RSS is RO.
* A3V is RO.
* SEIS is RO.
* IDbits is RO.
* PRIbits is RO.
*/
ICC_CTLR_EL1 requested_icc_ctlr_el1 = val;
ICC_CTLR_EL1 icc_ctlr_el1 =
readBankedMiscReg(MISCREG_ICC_CTLR_EL1);
ICC_CTLR_EL3 icc_ctlr_el3 =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL3);
// The following could be refactored but it is following
// spec description section 9.2.6 point by point.
// PMHE
if (haveEL(EL3)) {
// PMHE is alias of ICC_CTLR_EL3.PMHE
if (distributor->DS == 0) {
// PMHE is RO
} else if (distributor->DS == 1) {
// PMHE is RW
icc_ctlr_el1.PMHE = requested_icc_ctlr_el1.PMHE;
icc_ctlr_el3.PMHE = icc_ctlr_el1.PMHE;
}
} else {
// PMHE is RW (by implementation choice)
icc_ctlr_el1.PMHE = requested_icc_ctlr_el1.PMHE;
}
// EOImode
icc_ctlr_el1.EOImode = requested_icc_ctlr_el1.EOImode;
if (inSecureState()) {
// EOIMode is alias of ICC_CTLR_EL3.EOImode_EL1S
icc_ctlr_el3.EOImode_EL1S = icc_ctlr_el1.EOImode;
} else {
// EOIMode is alias of ICC_CTLR_EL3.EOImode_EL1NS
icc_ctlr_el3.EOImode_EL1NS = icc_ctlr_el1.EOImode;
}
// CBPR
if (haveEL(EL3)) {
// CBPR is alias of ICC_CTLR_EL3.CBPR_EL1{S,NS}
if (distributor->DS == 0) {
// CBPR is RO
} else {
// CBPR is RW
icc_ctlr_el1.CBPR = requested_icc_ctlr_el1.CBPR;
if (inSecureState()) {
icc_ctlr_el3.CBPR_EL1S = icc_ctlr_el1.CBPR;
} else {
icc_ctlr_el3.CBPR_EL1NS = icc_ctlr_el1.CBPR;
}
}
} else {
// CBPR is RW
icc_ctlr_el1.CBPR = requested_icc_ctlr_el1.CBPR;
}
isa->setMiscRegNoEffect(MISCREG_ICC_CTLR_EL3, icc_ctlr_el3);
setBankedMiscReg(MISCREG_ICC_CTLR_EL1, icc_ctlr_el1);
return;
}
// Virtual Control Register
case MISCREG_ICV_CTLR_EL1: {
ICV_CTLR_EL1 requested_icv_ctlr_el1 = val;
ICV_CTLR_EL1 icv_ctlr_el1 =
isa->readMiscRegNoEffect(MISCREG_ICV_CTLR_EL1);
icv_ctlr_el1.EOImode = requested_icv_ctlr_el1.EOImode;
icv_ctlr_el1.CBPR = requested_icv_ctlr_el1.CBPR;
val = icv_ctlr_el1;
// Aliases
// ICV_CTLR_EL1.CBPR aliases ICH_VMCR_EL2.VCBPR.
// ICV_CTLR_EL1.EOImode aliases ICH_VMCR_EL2.VEOIM.
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
ich_vmcr_el2.VCBPR = icv_ctlr_el1.CBPR;
ich_vmcr_el2.VEOIM = icv_ctlr_el1.EOImode;
isa->setMiscRegNoEffect(MISCREG_ICH_VMCR_EL2, ich_vmcr_el2);
break;
}
// Control Register EL3
case MISCREG_ICC_MCTLR:
case MISCREG_ICC_CTLR_EL3: {
/*
* ExtRange is RO.
* RSS is RO.
* nDS is RO.
* A3V is RO.
* SEIS is RO.
* IDbits is RO.
* PRIbits is RO.
* PMHE is RAO/WI, priority-based routing is always used.
*/
ICC_CTLR_EL3 requested_icc_ctlr_el3 = val;
// Aliases
if (haveEL(EL3))
{
ICC_CTLR_EL1 icc_ctlr_el1_s =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_S);
ICC_CTLR_EL1 icc_ctlr_el1_ns =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_NS);
// ICC_CTLR_EL1(NS).EOImode is an alias of
// ICC_CTLR_EL3.EOImode_EL1NS
icc_ctlr_el1_ns.EOImode = requested_icc_ctlr_el3.EOImode_EL1NS;
// ICC_CTLR_EL1(S).EOImode is an alias of
// ICC_CTLR_EL3.EOImode_EL1S
icc_ctlr_el1_s.EOImode = requested_icc_ctlr_el3.EOImode_EL1S;
// ICC_CTLR_EL1(NS).CBPR is an alias of ICC_CTLR_EL3.CBPR_EL1NS
icc_ctlr_el1_ns.CBPR = requested_icc_ctlr_el3.CBPR_EL1NS;
// ICC_CTLR_EL1(S).CBPR is an alias of ICC_CTLR_EL3.CBPR_EL1S
icc_ctlr_el1_s.CBPR = requested_icc_ctlr_el3.CBPR_EL1S;
isa->setMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_S, icc_ctlr_el1_s);
isa->setMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_NS,
icc_ctlr_el1_ns);
}
ICC_CTLR_EL3 icc_ctlr_el3 =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL3);
icc_ctlr_el3.RM = requested_icc_ctlr_el3.RM;
icc_ctlr_el3.EOImode_EL1NS = requested_icc_ctlr_el3.EOImode_EL1NS;
icc_ctlr_el3.EOImode_EL1S = requested_icc_ctlr_el3.EOImode_EL1S;
icc_ctlr_el3.EOImode_EL3 = requested_icc_ctlr_el3.EOImode_EL3;
icc_ctlr_el3.CBPR_EL1NS = requested_icc_ctlr_el3.CBPR_EL1NS;
icc_ctlr_el3.CBPR_EL1S = requested_icc_ctlr_el3.CBPR_EL1S;
val = icc_ctlr_el3;
break;
}
// Priority Mask Register
case MISCREG_ICC_PMR:
case MISCREG_ICC_PMR_EL1: {
if ((currEL() == EL1) && !inSecureState() && (hcr_imo || hcr_fmo)) {
return setMiscReg(MISCREG_ICV_PMR_EL1, val);
}
val &= 0xff;
SCR scr_el3 = isa->readMiscRegNoEffect(MISCREG_SCR_EL3);
if (haveEL(EL3) && !inSecureState() && (scr_el3.fiq)) {
// Spec section 4.8.1
// For Non-secure access to ICC_PMR_EL1 SCR_EL3.FIQ == 1:
RegVal old_icc_pmr_el1 =
isa->readMiscRegNoEffect(MISCREG_ICC_PMR_EL1);
if (!(old_icc_pmr_el1 & 0x80)) {
// If the current priority mask value is in the range of
// 0x00-0x7F then WI
return;
}
// If the current priority mask value is in the range of
// 0x80-0xFF then a write access to ICC_PMR_EL1 succeeds,
// based on the Non-secure read of the priority mask value
// written to the register.
val = (val >> 1) | 0x80;
}
val &= ~0U << (8 - PRIORITY_BITS);
break;
}
case MISCREG_ICV_PMR_EL1: { // Priority Mask Register
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
ich_vmcr_el2.VPMR = val & 0xff;
isa->setMiscRegNoEffect(MISCREG_ICH_VMCR_EL2, ich_vmcr_el2);
virtualUpdate();
return;
}
// Interrupt Group 0 Enable Register EL1
case MISCREG_ICC_IGRPEN0:
case MISCREG_ICC_IGRPEN0_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_fmo) {
return setMiscReg(MISCREG_ICV_IGRPEN0_EL1, val);
}
isa->setMiscRegNoEffect(MISCREG_ICC_IGRPEN0_EL1, val);
updateDistributor();
return;
}
// Virtual Interrupt Group 0 Enable register
case MISCREG_ICV_IGRPEN0_EL1: {
bool enable = val & 0x1;
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
ich_vmcr_el2.VENG0 = enable;
isa->setMiscRegNoEffect(MISCREG_ICH_VMCR_EL2, ich_vmcr_el2);
virtualUpdate();
return;
}
// Interrupt Group 1 Enable register EL1
case MISCREG_ICC_IGRPEN1:
case MISCREG_ICC_IGRPEN1_EL1: {
if ((currEL() == EL1) && !inSecureState() && hcr_imo) {
return setMiscReg(MISCREG_ICV_IGRPEN1_EL1, val);
}
setBankedMiscReg(MISCREG_ICC_IGRPEN1_EL1, val);
updateDistributor();
return;
}
// Virtual Interrupt Group 1 Enable register
case MISCREG_ICV_IGRPEN1_EL1: {
bool enable = val & 0x1;
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
ich_vmcr_el2.VENG1 = enable;
isa->setMiscRegNoEffect(MISCREG_ICH_VMCR_EL2, ich_vmcr_el2);
virtualUpdate();
return;
}
// Interrupt Group 1 Enable register
case MISCREG_ICC_MGRPEN1:
case MISCREG_ICC_IGRPEN1_EL3: {
ICC_IGRPEN1_EL3 icc_igrpen1_el3 = val;
isa->setMiscRegNoEffect(
MISCREG_ICC_IGRPEN1_EL1_S, icc_igrpen1_el3.EnableGrp1S);
isa->setMiscRegNoEffect(
MISCREG_ICC_IGRPEN1_EL1_NS, icc_igrpen1_el3.EnableGrp1NS);
updateDistributor();
return;
}
// Software Generated Interrupt Group 0 Register
case MISCREG_ICC_SGI0R:
case MISCREG_ICC_SGI0R_EL1:
generateSGI(val, Gicv3::G0S);
break;
// Software Generated Interrupt Group 1 Register
case MISCREG_ICC_SGI1R:
case MISCREG_ICC_SGI1R_EL1: {
Gicv3::GroupId group = inSecureState() ? Gicv3::G1S : Gicv3::G1NS;
generateSGI(val, group);
break;
}
// Alias Software Generated Interrupt Group 1 Register
case MISCREG_ICC_ASGI1R:
case MISCREG_ICC_ASGI1R_EL1: {
Gicv3::GroupId group = inSecureState() ? Gicv3::G1NS : Gicv3::G1S;
generateSGI(val, group);
break;
}
// System Register Enable Register EL1
case MISCREG_ICC_SRE:
case MISCREG_ICC_SRE_EL1:
// System Register Enable Register EL2
case MISCREG_ICC_HSRE:
case MISCREG_ICC_SRE_EL2:
// System Register Enable Register EL3
case MISCREG_ICC_MSRE:
case MISCREG_ICC_SRE_EL3:
// All bits are RAO/WI
return;
// Hyp Control Register
case MISCREG_ICH_HCR:
case MISCREG_ICH_HCR_EL2: {
ICH_HCR_EL2 requested_ich_hcr_el2 = val;
ICH_HCR_EL2 ich_hcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_HCR_EL2);
if (requested_ich_hcr_el2.EOIcount >= ich_hcr_el2.EOIcount)
{
// EOIcount - Permitted behaviors are:
// - Increment EOIcount.
// - Leave EOIcount unchanged.
ich_hcr_el2.EOIcount = requested_ich_hcr_el2.EOIcount;
}
ich_hcr_el2.TDIR = requested_ich_hcr_el2.TDIR;
ich_hcr_el2.TSEI = requested_ich_hcr_el2.TSEI;
ich_hcr_el2.TALL1 = requested_ich_hcr_el2.TALL1;;
ich_hcr_el2.TALL0 = requested_ich_hcr_el2.TALL0;;
ich_hcr_el2.TC = requested_ich_hcr_el2.TC;
ich_hcr_el2.VGrp1DIE = requested_ich_hcr_el2.VGrp1DIE;
ich_hcr_el2.VGrp1EIE = requested_ich_hcr_el2.VGrp1EIE;
ich_hcr_el2.VGrp0DIE = requested_ich_hcr_el2.VGrp0DIE;
ich_hcr_el2.VGrp0EIE = requested_ich_hcr_el2.VGrp0EIE;
ich_hcr_el2.NPIE = requested_ich_hcr_el2.NPIE;
ich_hcr_el2.LRENPIE = requested_ich_hcr_el2.LRENPIE;
ich_hcr_el2.UIE = requested_ich_hcr_el2.UIE;
ich_hcr_el2.En = requested_ich_hcr_el2.En;
val = ich_hcr_el2;
do_virtual_update = true;
break;
}
// List Registers
case MISCREG_ICH_LRC0 ... MISCREG_ICH_LRC15: {
// AArch32 (maps to AArch64 MISCREG_ICH_LR<n>_EL2 high half part)
ICH_LRC requested_ich_lrc = val;
ICH_LRC ich_lrc = isa->readMiscRegNoEffect(misc_reg);
ich_lrc.State = requested_ich_lrc.State;
ich_lrc.HW = requested_ich_lrc.HW;
ich_lrc.Group = requested_ich_lrc.Group;
// Priority, bits [23:16]
// At least five bits must be implemented.
// Unimplemented bits are RES0 and start from bit[16] up to bit[18].
// We implement 5 bits.
ich_lrc.Priority = (requested_ich_lrc.Priority & 0xf8) |
(ich_lrc.Priority & 0x07);
// pINTID, bits [12:0]
// When ICH_LR<n>.HW is 0 this field has the following meaning:
// - Bits[12:10] : RES0.
// - Bit[9] : EOI.
// - Bits[8:0] : RES0.
// When ICH_LR<n>.HW is 1:
// - This field is only required to implement enough bits to hold a
// valid value for the implemented INTID size. Any unused higher
// order bits are RES0.
if (requested_ich_lrc.HW == 0) {
ich_lrc.EOI = requested_ich_lrc.EOI;
} else {
ich_lrc.pINTID = requested_ich_lrc.pINTID;
}
val = ich_lrc;
do_virtual_update = true;
break;
}
// List Registers
case MISCREG_ICH_LR0 ... MISCREG_ICH_LR15: {
// AArch32 (maps to AArch64 MISCREG_ICH_LR<n>_EL2 low half part)
RegVal old_val = isa->readMiscRegNoEffect(misc_reg);
val = (old_val & 0xffffffff00000000) | (val & 0xffffffff);
do_virtual_update = true;
break;
}
// List Registers
case MISCREG_ICH_LR0_EL2 ... MISCREG_ICH_LR15_EL2: { // AArch64
ICH_LR_EL2 requested_ich_lr_el2 = val;
ICH_LR_EL2 ich_lr_el2 = isa->readMiscRegNoEffect(misc_reg);
ich_lr_el2.State = requested_ich_lr_el2.State;
ich_lr_el2.HW = requested_ich_lr_el2.HW;
ich_lr_el2.Group = requested_ich_lr_el2.Group;
// Priority, bits [55:48]
// At least five bits must be implemented.
// Unimplemented bits are RES0 and start from bit[48] up to bit[50].
// We implement 5 bits.
ich_lr_el2.Priority = (requested_ich_lr_el2.Priority & 0xf8) |
(ich_lr_el2.Priority & 0x07);
// pINTID, bits [44:32]
// When ICH_LR<n>_EL2.HW is 0 this field has the following meaning:
// - Bits[44:42] : RES0.
// - Bit[41] : EOI.
// - Bits[40:32] : RES0.
// When ICH_LR<n>_EL2.HW is 1:
// - This field is only required to implement enough bits to hold a
// valid value for the implemented INTID size. Any unused higher
// order bits are RES0.
if (requested_ich_lr_el2.HW == 0) {
ich_lr_el2.EOI = requested_ich_lr_el2.EOI;
} else {
ich_lr_el2.pINTID = requested_ich_lr_el2.pINTID;
}
// vINTID, bits [31:0]
// It is IMPLEMENTATION DEFINED how many bits are implemented,
// though at least 16 bits must be implemented.
// Unimplemented bits are RES0.
ich_lr_el2.vINTID = requested_ich_lr_el2.vINTID;
val = ich_lr_el2;
do_virtual_update = true;
break;
}
// Virtual Machine Control Register
case MISCREG_ICH_VMCR:
case MISCREG_ICH_VMCR_EL2: {
ICH_VMCR_EL2 requested_ich_vmcr_el2 = val;
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
ich_vmcr_el2.VPMR = requested_ich_vmcr_el2.VPMR;
uint8_t min_vpr0 = 7 - VIRTUAL_PREEMPTION_BITS;
if (requested_ich_vmcr_el2.VBPR0 < min_vpr0) {
ich_vmcr_el2.VBPR0 = min_vpr0;
} else {
ich_vmcr_el2.VBPR0 = requested_ich_vmcr_el2.VBPR0;
}
uint8_t min_vpr1 = min_vpr0 + 1;
if (requested_ich_vmcr_el2.VBPR1 < min_vpr1) {
ich_vmcr_el2.VBPR1 = min_vpr1;
} else {
ich_vmcr_el2.VBPR1 = requested_ich_vmcr_el2.VBPR1;
}
ich_vmcr_el2.VEOIM = requested_ich_vmcr_el2.VEOIM;
ich_vmcr_el2.VCBPR = requested_ich_vmcr_el2.VCBPR;
ich_vmcr_el2.VENG1 = requested_ich_vmcr_el2.VENG1;
ich_vmcr_el2.VENG0 = requested_ich_vmcr_el2.VENG0;
val = ich_vmcr_el2;
break;
}
// Hyp Active Priorities Group 0 Registers
case MISCREG_ICH_AP0R0:
case MISCREG_ICH_AP0R0_EL2:
break;
// only implemented if supporting 6 or more bits of priority
case MISCREG_ICH_AP0R1:
case MISCREG_ICH_AP0R1_EL2:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICH_AP0R2:
case MISCREG_ICH_AP0R2_EL2:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICH_AP0R3:
case MISCREG_ICH_AP0R3_EL2:
// Unimplemented registers are RAZ/WI
return;
// Hyp Active Priorities Group 1 Registers
case MISCREG_ICH_AP1R0:
case MISCREG_ICH_AP1R0_EL2:
break;
// only implemented if supporting 6 or more bits of priority
case MISCREG_ICH_AP1R1:
case MISCREG_ICH_AP1R1_EL2:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICH_AP1R2:
case MISCREG_ICH_AP1R2_EL2:
// only implemented if supporting 7 or more bits of priority
case MISCREG_ICH_AP1R3:
case MISCREG_ICH_AP1R3_EL2:
// Unimplemented registers are RAZ/WI
return;
default:
panic("Gicv3CPUInterface::setMiscReg(): unknown register %d (%s)",
misc_reg, miscRegName[misc_reg]);
}
isa->setMiscRegNoEffect(misc_reg, val);
if (do_virtual_update) {
virtualUpdate();
}
}
RegVal
Gicv3CPUInterface::readBankedMiscReg(MiscRegIndex misc_reg) const
{
return isa->readMiscRegNoEffect(
isa->snsBankedIndex64(misc_reg, !isSecureBelowEL3()));
}
void
Gicv3CPUInterface::setBankedMiscReg(MiscRegIndex misc_reg, RegVal val) const
{
isa->setMiscRegNoEffect(
isa->snsBankedIndex64(misc_reg, !isSecureBelowEL3()), val);
}
int
Gicv3CPUInterface::virtualFindActive(uint32_t int_id) const
{
for (uint32_t lr_idx = 0; lr_idx < VIRTUAL_NUM_LIST_REGS; lr_idx++) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
if (((ich_lr_el2.State == ICH_LR_EL2_STATE_ACTIVE) ||
(ich_lr_el2.State == ICH_LR_EL2_STATE_ACTIVE_PENDING)) &&
(ich_lr_el2.vINTID == int_id)) {
return lr_idx;
}
}
return -1;
}
uint32_t
Gicv3CPUInterface::getHPPIR0() const
{
if (hppi.prio == 0xff || !groupEnabled(hppi.group)) {
return Gicv3::INTID_SPURIOUS;
}
bool irq_is_secure = !distributor->DS && hppi.group != Gicv3::G1NS;
if ((hppi.group != Gicv3::G0S) && isEL3OrMon()) {
// interrupt for the other state pending
return irq_is_secure ? Gicv3::INTID_SECURE : Gicv3::INTID_NONSECURE;
}
if ((hppi.group != Gicv3::G0S)) { // && !isEL3OrMon())
return Gicv3::INTID_SPURIOUS;
}
if (irq_is_secure && !inSecureState()) {
// Secure interrupts not visible in Non-secure
return Gicv3::INTID_SPURIOUS;
}
return hppi.intid;
}
uint32_t
Gicv3CPUInterface::getHPPIR1() const
{
if (hppi.prio == 0xff || !groupEnabled(hppi.group)) {
return Gicv3::INTID_SPURIOUS;
}
ICC_CTLR_EL3 icc_ctlr_el3 = isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL3);
if ((currEL() == EL3) && icc_ctlr_el3.RM) {
if (hppi.group == Gicv3::G0S) {
return Gicv3::INTID_SECURE;
} else if (hppi.group == Gicv3::G1NS) {
return Gicv3::INTID_NONSECURE;
}
}
if (hppi.group == Gicv3::G0S) {
return Gicv3::INTID_SPURIOUS;
}
bool irq_is_secure = (distributor->DS == 0) && (hppi.group != Gicv3::G1NS);
if (irq_is_secure) {
if (!inSecureState()) {
// Secure interrupts not visible in Non-secure
return Gicv3::INTID_SPURIOUS;
}
} else if (!isEL3OrMon() && inSecureState()) {
// Group 1 non-secure interrupts not visible in Secure EL1
return Gicv3::INTID_SPURIOUS;
}
return hppi.intid;
}
void
Gicv3CPUInterface::dropPriority(Gicv3::GroupId group)
{
int apr_misc_reg = 0;
switch (group) {
case Gicv3::G0S:
apr_misc_reg = MISCREG_ICC_AP0R0_EL1;
break;
case Gicv3::G1S:
apr_misc_reg = MISCREG_ICC_AP1R0_EL1_S;
break;
case Gicv3::G1NS:
apr_misc_reg = MISCREG_ICC_AP1R0_EL1_NS;
break;
default:
panic("Invalid Gicv3::GroupId");
}
RegVal apr = isa->readMiscRegNoEffect(apr_misc_reg);
if (apr) {
apr &= apr - 1;
isa->setMiscRegNoEffect(apr_misc_reg, apr);
}
update();
}
uint8_t
Gicv3CPUInterface::virtualDropPriority()
{
int apr_max = 1 << (VIRTUAL_PREEMPTION_BITS - 5);
for (int i = 0; i < apr_max; i++) {
RegVal vapr0 = isa->readMiscRegNoEffect(MISCREG_ICH_AP0R0_EL2 + i);
RegVal vapr1 = isa->readMiscRegNoEffect(MISCREG_ICH_AP1R0_EL2 + i);
if (!vapr0 && !vapr1) {
continue;
}
int vapr0_count = ctz32(vapr0);
int vapr1_count = ctz32(vapr1);
if (vapr0_count <= vapr1_count) {
vapr0 &= vapr0 - 1;
isa->setMiscRegNoEffect(MISCREG_ICH_AP0R0_EL2 + i, vapr0);
return (vapr0_count + i * 32) << (GIC_MIN_VBPR + 1);
} else {
vapr1 &= vapr1 - 1;
isa->setMiscRegNoEffect(MISCREG_ICH_AP1R0_EL2 + i, vapr1);
return (vapr1_count + i * 32) << (GIC_MIN_VBPR + 1);
}
}
return 0xff;
}
void
Gicv3CPUInterface::generateSGI(RegVal val, Gicv3::GroupId group)
{
uint8_t aff3 = bits(val, 55, 48);
uint8_t aff2 = bits(val, 39, 32);
uint8_t aff1 = bits(val, 23, 16);;
uint16_t target_list = bits(val, 15, 0);
uint32_t int_id = bits(val, 27, 24);
bool irm = bits(val, 40, 40);
uint8_t rs = bits(val, 47, 44);
bool ns = !inSecureState();
for (int i = 0; i < gic->getSystem()->threads.size(); i++) {
Gicv3Redistributor * redistributor_i =
gic->getRedistributor(i);
uint32_t affinity_i = redistributor_i->getAffinity();
if (irm) {
// Interrupts routed to all PEs in the system,
// excluding "self"
if (affinity_i == redistributor->getAffinity()) {
continue;
}
} else {
// Interrupts routed to the PEs specified by
// Aff3.Aff2.Aff1.<target list>
if ((affinity_i >> 8) !=
((aff3 << 16) | (aff2 << 8) | (aff1 << 0))) {
continue;
}
uint8_t aff0_i = bits(affinity_i, 7, 0);
if (!(aff0_i >= rs * 16 && aff0_i < (rs + 1) * 16 &&
((0x1 << (aff0_i - rs * 16)) & target_list))) {
continue;
}
}
redistributor_i->sendSGI(int_id, group, ns);
}
}
void
Gicv3CPUInterface::activateIRQ(uint32_t int_id, Gicv3::GroupId group)
{
// Update active priority registers.
uint32_t prio = hppi.prio & 0xf8;
int apr_bit = prio >> (8 - PRIORITY_BITS);
int reg_bit = apr_bit % 32;
int apr_idx = 0;
switch (group) {
case Gicv3::G0S:
apr_idx = MISCREG_ICC_AP0R0_EL1;
break;
case Gicv3::G1S:
apr_idx = MISCREG_ICC_AP1R0_EL1_S;
break;
case Gicv3::G1NS:
apr_idx = MISCREG_ICC_AP1R0_EL1_NS;
break;
default:
panic("Invalid Gicv3::GroupId");
}
RegVal apr = isa->readMiscRegNoEffect(apr_idx);
apr |= (1 << reg_bit);
isa->setMiscRegNoEffect(apr_idx, apr);
// Move interrupt state from pending to active.
if (int_id < Gicv3::SGI_MAX + Gicv3::PPI_MAX) {
// SGI or PPI, redistributor
redistributor->activateIRQ(int_id);
} else if (int_id < Gicv3::INTID_SECURE) {
// SPI, distributor
distributor->activateIRQ(int_id);
} else if (int_id >= Gicv3Redistributor::SMALLEST_LPI_ID) {
// LPI, Redistributor
redistributor->setClrLPI(int_id, false);
}
// By setting the priority to 0xff we are effectively
// making the int_id not pending anymore at the cpu
// interface.
resetHppi(int_id);
updateDistributor();
}
void
Gicv3CPUInterface::virtualActivateIRQ(uint32_t lr_idx)
{
// Update active priority registers.
ICH_LR_EL2 ich_lr_el = isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 +
lr_idx);
Gicv3::GroupId group = ich_lr_el.Group ? Gicv3::G1NS : Gicv3::G0S;
uint8_t prio = ich_lr_el.Priority & 0xf8;
int apr_bit = prio >> (8 - VIRTUAL_PREEMPTION_BITS);
int reg_no = apr_bit / 32;
int reg_bit = apr_bit % 32;
int apr_idx = group == Gicv3::G0S ?
MISCREG_ICH_AP0R0_EL2 + reg_no : MISCREG_ICH_AP1R0_EL2 + reg_no;
RegVal apr = isa->readMiscRegNoEffect(apr_idx);
apr |= (1 << reg_bit);
isa->setMiscRegNoEffect(apr_idx, apr);
// Move interrupt state from pending to active.
ich_lr_el.State = ICH_LR_EL2_STATE_ACTIVE;
isa->setMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx, ich_lr_el);
}
void
Gicv3CPUInterface::deactivateIRQ(uint32_t int_id, Gicv3::GroupId group)
{
if (int_id < Gicv3::SGI_MAX + Gicv3::PPI_MAX) {
// SGI or PPI, redistributor
redistributor->deactivateIRQ(int_id);
} else if (int_id < Gicv3::INTID_SECURE) {
// SPI, distributor
distributor->deactivateIRQ(int_id);
}
updateDistributor();
}
void
Gicv3CPUInterface::virtualDeactivateIRQ(int lr_idx)
{
ICH_LR_EL2 ich_lr_el2 = isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 +
lr_idx);
if (ich_lr_el2.HW) {
// Deactivate the associated physical interrupt
if (ich_lr_el2.pINTID < Gicv3::INTID_SECURE) {
Gicv3::GroupId group = ich_lr_el2.pINTID >= 32 ?
distributor->getIntGroup(ich_lr_el2.pINTID) :
redistributor->getIntGroup(ich_lr_el2.pINTID);
deactivateIRQ(ich_lr_el2.pINTID, group);
}
}
// Remove the active bit
ich_lr_el2.State = ich_lr_el2.State & ~ICH_LR_EL2_STATE_ACTIVE;
isa->setMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx, ich_lr_el2);
}
/*
* Returns the priority group field for the current BPR value for the group.
* GroupBits() Pseudocode from spec.
*/
uint32_t
Gicv3CPUInterface::groupPriorityMask(Gicv3::GroupId group)
{
ICC_CTLR_EL1 icc_ctlr_el1_s =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_S);
ICC_CTLR_EL1 icc_ctlr_el1_ns =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_NS);
if ((group == Gicv3::G1S && icc_ctlr_el1_s.CBPR) ||
(group == Gicv3::G1NS && icc_ctlr_el1_ns.CBPR)) {
group = Gicv3::G0S;
}
int bpr;
if (group == Gicv3::G0S) {
bpr = readMiscReg(MISCREG_ICC_BPR0_EL1) & 0x7;
} else if (group == Gicv3::G1S) {
bpr = bpr1(Gicv3::G1S) & 0x7;
} else {
bpr = bpr1(Gicv3::G1NS) & 0x7;
}
if (group == Gicv3::G1NS) {
assert(bpr > 0);
bpr--;
}
return ~0U << (bpr + 1);
}
uint32_t
Gicv3CPUInterface::virtualGroupPriorityMask(Gicv3::GroupId group) const
{
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
if ((group == Gicv3::G1NS) && ich_vmcr_el2.VCBPR) {
group = Gicv3::G0S;
}
int bpr;
if (group == Gicv3::G0S) {
bpr = ich_vmcr_el2.VBPR0;
} else {
bpr = ich_vmcr_el2.VBPR1;
}
if (group == Gicv3::G1NS) {
assert(bpr > 0);
bpr--;
}
return ~0U << (bpr + 1);
}
bool
Gicv3CPUInterface::isEOISplitMode() const
{
if (isEL3OrMon()) {
ICC_CTLR_EL3 icc_ctlr_el3 =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL3);
return icc_ctlr_el3.EOImode_EL3;
} else {
ICC_CTLR_EL1 icc_ctlr_el1 = 0;
if (inSecureState())
icc_ctlr_el1 = isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_S);
else
icc_ctlr_el1 = isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_NS);
return icc_ctlr_el1.EOImode;
}
}
bool
Gicv3CPUInterface::virtualIsEOISplitMode() const
{
ICH_VMCR_EL2 ich_vmcr_el2 = isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
return ich_vmcr_el2.VEOIM;
}
int
Gicv3CPUInterface::highestActiveGroup() const
{
int g0_ctz = ctz32(isa->readMiscRegNoEffect(MISCREG_ICC_AP0R0_EL1));
int gq_ctz = ctz32(isa->readMiscRegNoEffect(MISCREG_ICC_AP1R0_EL1_S));
int g1nz_ctz = ctz32(isa->readMiscRegNoEffect(MISCREG_ICC_AP1R0_EL1_NS));
if (g1nz_ctz < g0_ctz && g1nz_ctz < gq_ctz) {
return Gicv3::G1NS;
}
if (gq_ctz < g0_ctz) {
return Gicv3::G1S;
}
if (g0_ctz < 32) {
return Gicv3::G0S;
}
return -1;
}
void
Gicv3CPUInterface::updateDistributor()
{
distributor->update();
}
void
Gicv3CPUInterface::update()
{
if (gic->blockIntUpdate())
return;
bool signal_IRQ = false;
bool signal_FIQ = false;
if (hppi.group == Gicv3::G1S && !haveEL(EL3)) {
/*
* Secure enabled GIC sending a G1S IRQ to a secure disabled
* CPU -> send G0 IRQ
*/
hppi.group = Gicv3::G0S;
}
if (hppiCanPreempt()) {
InterruptTypes int_type = intSignalType(hppi.group);
DPRINTF(GIC, "Gicv3CPUInterface::update(): "
"posting int as %d!\n", int_type);
int_type == INT_IRQ ? signal_IRQ = true : signal_FIQ = true;
}
if (signal_IRQ) {
gic->postInt(cpuId, INT_IRQ);
} else {
gic->deassertInt(cpuId, INT_IRQ);
}
if (signal_FIQ) {
gic->postInt(cpuId, INT_FIQ);
} else {
gic->deassertInt(cpuId, INT_FIQ);
}
}
void
Gicv3CPUInterface::virtualUpdate()
{
if (gic->blockIntUpdate())
return;
bool signal_IRQ = false;
bool signal_FIQ = false;
int lr_idx = getHPPVILR();
if (lr_idx >= 0) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
if (hppviCanPreempt(lr_idx)) {
if (ich_lr_el2.Group) {
signal_IRQ = true;
} else {
signal_FIQ = true;
}
}
}
ICH_HCR_EL2 ich_hcr_el2 = isa->readMiscRegNoEffect(MISCREG_ICH_HCR_EL2);
const bool maint_pending = redistributor->irqPending[
maintenanceInterrupt->num()];
if (ich_hcr_el2.En && !maint_pending && maintenanceInterruptStatus()) {
maintenanceInterrupt->raise();
} else if (maint_pending) {
maintenanceInterrupt->clear();
}
if (signal_IRQ) {
DPRINTF(GIC, "Gicv3CPUInterface::virtualUpdate(): "
"posting int as %d!\n", INT_VIRT_IRQ);
gic->postInt(cpuId, INT_VIRT_IRQ);
} else {
gic->deassertInt(cpuId, INT_VIRT_IRQ);
}
if (signal_FIQ) {
DPRINTF(GIC, "Gicv3CPUInterface::virtualUpdate(): "
"posting int as %d!\n", INT_VIRT_FIQ);
gic->postInt(cpuId, INT_VIRT_FIQ);
} else {
gic->deassertInt(cpuId, INT_VIRT_FIQ);
}
}
// Returns the index of the LR with the HPPI
int
Gicv3CPUInterface::getHPPVILR() const
{
int idx = -1;
ICH_VMCR_EL2 ich_vmcr_el2 = isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
if (!ich_vmcr_el2.VENG0 && !ich_vmcr_el2.VENG1) {
// VG0 and VG1 disabled...
return idx;
}
uint8_t highest_prio = 0xff;
for (int i = 0; i < 16; i++) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + i);
if (ich_lr_el2.State != Gicv3::INT_PENDING) {
continue;
}
if (ich_lr_el2.Group) {
// VG1
if (!ich_vmcr_el2.VENG1) {
continue;
}
} else {
// VG0
if (!ich_vmcr_el2.VENG0) {
continue;
}
}
uint8_t prio = ich_lr_el2.Priority;
if (prio < highest_prio) {
highest_prio = prio;
idx = i;
}
}
return idx;
}
bool
Gicv3CPUInterface::hppviCanPreempt(int lr_idx) const
{
ICH_HCR_EL2 ich_hcr_el2 = isa->readMiscRegNoEffect(MISCREG_ICH_HCR_EL2);
if (!ich_hcr_el2.En) {
// virtual interface is disabled
return false;
}
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
uint8_t prio = ich_lr_el2.Priority;
uint8_t vpmr =
bits(isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2), 31, 24);
if (prio >= vpmr) {
// prioriry masked
return false;
}
uint8_t rprio = virtualHighestActivePriority();
if (rprio == 0xff) {
return true;
}
Gicv3::GroupId group = ich_lr_el2.Group ? Gicv3::G1NS : Gicv3::G0S;
uint32_t prio_mask = virtualGroupPriorityMask(group);
if ((prio & prio_mask) < (rprio & prio_mask)) {
return true;
}
return false;
}
uint8_t
Gicv3CPUInterface::virtualHighestActivePriority() const
{
uint8_t num_aprs = 1 << (VIRTUAL_PRIORITY_BITS - 5);
for (int i = 0; i < num_aprs; i++) {
RegVal vapr =
isa->readMiscRegNoEffect(MISCREG_ICH_AP0R0_EL2 + i) |
isa->readMiscRegNoEffect(MISCREG_ICH_AP1R0_EL2 + i);
if (!vapr) {
continue;
}
return (i * 32 + ctz32(vapr)) << (GIC_MIN_VBPR + 1);
}
// no active interrups, return idle priority
return 0xff;
}
void
Gicv3CPUInterface::virtualIncrementEOICount()
{
// Increment the EOICOUNT field in ICH_HCR_EL2
RegVal ich_hcr_el2 = isa->readMiscRegNoEffect(MISCREG_ICH_HCR_EL2);
uint32_t EOI_cout = bits(ich_hcr_el2, 31, 27);
EOI_cout++;
ich_hcr_el2 = insertBits(ich_hcr_el2, 31, 27, EOI_cout);
isa->setMiscRegNoEffect(MISCREG_ICH_HCR_EL2, ich_hcr_el2);
}
// spec section 4.6.2
InterruptTypes
Gicv3CPUInterface::intSignalType(Gicv3::GroupId group) const
{
bool is_fiq = false;
switch (group) {
case Gicv3::G0S:
is_fiq = true;
break;
case Gicv3::G1S:
is_fiq = (distributor->DS == 0) &&
(!inSecureState() || ((currEL() == EL3) && isAA64()));
break;
case Gicv3::G1NS:
is_fiq = (distributor->DS == 0) && inSecureState();
break;
default:
panic("Gicv3CPUInterface::intSignalType(): invalid group!");
}
if (is_fiq) {
return INT_FIQ;
} else {
return INT_IRQ;
}
}
bool
Gicv3CPUInterface::hppiCanPreempt()
{
if (hppi.prio == 0xff) {
// there is no pending interrupt
return false;
}
if (!groupEnabled(hppi.group)) {
// group disabled at CPU interface
return false;
}
if (hppi.prio >= isa->readMiscRegNoEffect(MISCREG_ICC_PMR_EL1)) {
// priority masked
return false;
}
uint8_t rprio = highestActivePriority();
if (rprio == 0xff) {
return true;
}
uint32_t prio_mask = groupPriorityMask(hppi.group);
if ((hppi.prio & prio_mask) < (rprio & prio_mask)) {
return true;
}
return false;
}
uint8_t
Gicv3CPUInterface::highestActivePriority() const
{
uint32_t apr = isa->readMiscRegNoEffect(MISCREG_ICC_AP0R0_EL1) |
isa->readMiscRegNoEffect(MISCREG_ICC_AP1R0_EL1_NS) |
isa->readMiscRegNoEffect(MISCREG_ICC_AP1R0_EL1_S);
if (apr) {
return ctz32(apr) << (GIC_MIN_BPR + 1);
}
// no active interrups, return idle priority
return 0xff;
}
bool
Gicv3CPUInterface::groupEnabled(Gicv3::GroupId group) const
{
switch (group) {
case Gicv3::G0S: {
ICC_IGRPEN0_EL1 icc_igrpen0_el1 =
isa->readMiscRegNoEffect(MISCREG_ICC_IGRPEN0_EL1);
return icc_igrpen0_el1.Enable && distributor->EnableGrp0;
}
case Gicv3::G1S: {
ICC_IGRPEN1_EL1 icc_igrpen1_el1_s =
isa->readMiscRegNoEffect(MISCREG_ICC_IGRPEN1_EL1_S);
return icc_igrpen1_el1_s.Enable && distributor->EnableGrp1S;
}
case Gicv3::G1NS: {
ICC_IGRPEN1_EL1 icc_igrpen1_el1_ns =
isa->readMiscRegNoEffect(MISCREG_ICC_IGRPEN1_EL1_NS);
return icc_igrpen1_el1_ns.Enable && distributor->EnableGrp1NS;
}
default:
panic("Gicv3CPUInterface::groupEnable(): invalid group!\n");
}
}
bool
Gicv3CPUInterface::inSecureState() const
{
return isa->inSecureState();
}
ExceptionLevel
Gicv3CPUInterface::currEL() const
{
return isa->currEL();
}
bool
Gicv3CPUInterface::haveEL(ExceptionLevel el) const
{
switch (el) {
case EL0:
case EL1:
return true;
case EL2:
return gic->getSystem()->has(ArmExtension::VIRTUALIZATION);
case EL3:
return gic->getSystem()->has(ArmExtension::SECURITY);
default:
warn("Unimplemented Exception Level\n");
return false;
}
}
bool
Gicv3CPUInterface::isSecureBelowEL3() const
{
SCR scr = isa->readMiscRegNoEffect(MISCREG_SCR_EL3);
return haveEL(EL3) && scr.ns == 0;
}
bool
Gicv3CPUInterface::isAA64() const
{
CPSR cpsr = isa->readMiscRegNoEffect(MISCREG_CPSR);
return opModeIs64((OperatingMode)(uint8_t) cpsr.mode);
}
bool
Gicv3CPUInterface::isEL3OrMon() const
{
if (haveEL(EL3)) {
CPSR cpsr = isa->readMiscRegNoEffect(MISCREG_CPSR);
bool is_64 = opModeIs64((OperatingMode)(uint8_t) cpsr.mode);
if (is_64 && (cpsr.el == EL3)) {
return true;
} else if (!is_64 && (cpsr.mode == MODE_MON)) {
return true;
}
}
return false;
}
// Computes ICH_EISR_EL2
uint64_t
Gicv3CPUInterface::eoiMaintenanceInterruptStatus() const
{
// ICH_EISR_EL2
// Bits [63:16] - RES0
// Status<n>, bit [n], for n = 0 to 15
// EOI maintenance interrupt status bit for List register <n>:
// 0 if List register <n>, ICH_LR<n>_EL2, does not have an EOI
// maintenance interrupt.
// 1 if List register <n>, ICH_LR<n>_EL2, has an EOI maintenance
// interrupt that has not been handled.
//
// For any ICH_LR<n>_EL2, the corresponding status bit is set to 1 if all
// of the following are true:
// - ICH_LR<n>_EL2.State is 0b00 (ICH_LR_EL2_STATE_INVALID).
// - ICH_LR<n>_EL2.HW is 0.
// - ICH_LR<n>_EL2.EOI (bit [41]) is 1.
uint64_t value = 0;
for (int lr_idx = 0; lr_idx < VIRTUAL_NUM_LIST_REGS; lr_idx++) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
if ((ich_lr_el2.State == ICH_LR_EL2_STATE_INVALID) &&
!ich_lr_el2.HW && ich_lr_el2.EOI) {
value |= (1 << lr_idx);
}
}
return value;
}
Gicv3CPUInterface::ICH_MISR_EL2
Gicv3CPUInterface::maintenanceInterruptStatus() const
{
// Comments are copied from SPEC section 9.4.7 (ID012119)
ICH_MISR_EL2 ich_misr_el2 = 0;
ICH_HCR_EL2 ich_hcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_HCR_EL2);
ICH_VMCR_EL2 ich_vmcr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_VMCR_EL2);
// End Of Interrupt. [bit 0]
// This maintenance interrupt is asserted when at least one bit in
// ICH_EISR_EL2 is 1.
if (eoiMaintenanceInterruptStatus()) {
ich_misr_el2.EOI = 1;
}
// Underflow. [bit 1]
// This maintenance interrupt is asserted when ICH_HCR_EL2.UIE==1 and
// zero or one of the List register entries are marked as a valid
// interrupt, that is, if the corresponding ICH_LR<n>_EL2.State bits
// do not equal 0x0.
uint32_t num_valid_interrupts = 0;
uint32_t num_pending_interrupts = 0;
for (int lr_idx = 0; lr_idx < VIRTUAL_NUM_LIST_REGS; lr_idx++) {
ICH_LR_EL2 ich_lr_el2 =
isa->readMiscRegNoEffect(MISCREG_ICH_LR0_EL2 + lr_idx);
if (ich_lr_el2.State != ICH_LR_EL2_STATE_INVALID) {
num_valid_interrupts++;
}
if (ich_lr_el2.State == ICH_LR_EL2_STATE_PENDING) {
num_pending_interrupts++;
}
}
if (ich_hcr_el2.UIE && (num_valid_interrupts < 2)) {
ich_misr_el2.U = 1;
}
// List Register Entry Not Present. [bit 2]
// This maintenance interrupt is asserted when ICH_HCR_EL2.LRENPIE==1
// and ICH_HCR_EL2.EOIcount is non-zero.
if (ich_hcr_el2.LRENPIE && ich_hcr_el2.EOIcount) {
ich_misr_el2.LRENP = 1;
}
// No Pending. [bit 3]
// This maintenance interrupt is asserted when ICH_HCR_EL2.NPIE==1 and
// no List register is in pending state.
if (ich_hcr_el2.NPIE && (num_pending_interrupts == 0)) {
ich_misr_el2.NP = 1;
}
// vPE Group 0 Enabled. [bit 4]
// This maintenance interrupt is asserted when
// ICH_HCR_EL2.VGrp0EIE==1 and ICH_VMCR_EL2.VENG0==1.
if (ich_hcr_el2.VGrp0EIE && ich_vmcr_el2.VENG0) {
ich_misr_el2.VGrp0E = 1;
}
// vPE Group 0 Disabled. [bit 5]
// This maintenance interrupt is asserted when
// ICH_HCR_EL2.VGrp0DIE==1 and ICH_VMCR_EL2.VENG0==0.
if (ich_hcr_el2.VGrp0DIE && !ich_vmcr_el2.VENG0) {
ich_misr_el2.VGrp0D = 1;
}
// vPE Group 1 Enabled. [bit 6]
// This maintenance interrupt is asserted when
// ICH_HCR_EL2.VGrp1EIE==1 and ICH_VMCR_EL2.VENG1==is 1.
if (ich_hcr_el2.VGrp1EIE && ich_vmcr_el2.VENG1) {
ich_misr_el2.VGrp1E = 1;
}
// vPE Group 1 Disabled. [bit 7]
// This maintenance interrupt is asserted when
// ICH_HCR_EL2.VGrp1DIE==1 and ICH_VMCR_EL2.VENG1==is 0.
if (ich_hcr_el2.VGrp1DIE && !ich_vmcr_el2.VENG1) {
ich_misr_el2.VGrp1D = 1;
}
return ich_misr_el2;
}
RegVal
Gicv3CPUInterface::bpr1(Gicv3::GroupId group)
{
bool hcr_imo = getHCREL2IMO();
if ((currEL() == EL1) && !inSecureState() && hcr_imo) {
return readMiscReg(MISCREG_ICV_BPR1_EL1);
}
RegVal bpr = 0;
if (group == Gicv3::G1S) {
ICC_CTLR_EL1 icc_ctlr_el1_s =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_S);
if (!isEL3OrMon() && icc_ctlr_el1_s.CBPR) {
bpr = isa->readMiscRegNoEffect(MISCREG_ICC_BPR0_EL1);
} else {
bpr = isa->readMiscRegNoEffect(MISCREG_ICC_BPR1_EL1_S);
bpr = bpr > GIC_MIN_BPR ? bpr : GIC_MIN_BPR;
}
} else if (group == Gicv3::G1NS) {
ICC_CTLR_EL1 icc_ctlr_el1_ns =
isa->readMiscRegNoEffect(MISCREG_ICC_CTLR_EL1_NS);
// Check if EL3 is implemented and this is a non secure accesses at
// EL1 and EL2
if (haveEL(EL3) && !isEL3OrMon() && icc_ctlr_el1_ns.CBPR) {
// Reads return BPR0 + 1 saturated to 7, WI
bpr = isa->readMiscRegNoEffect(MISCREG_ICC_BPR0_EL1) + 1;
bpr = bpr < 7 ? bpr : 7;
} else {
bpr = isa->readMiscRegNoEffect(MISCREG_ICC_BPR1_EL1_NS);
bpr = bpr > GIC_MIN_BPR_NS ? bpr : GIC_MIN_BPR_NS;
}
} else {
panic("Should be used with G1S and G1NS only\n");
}
return bpr;
}
bool
Gicv3CPUInterface::havePendingInterrupts() const
{
return gic->haveAsserted(cpuId) || hppi.prio != 0xff;
}
void
Gicv3CPUInterface::clearPendingInterrupts()
{
gic->deassertAll(cpuId);
resetHppi(hppi.intid);
}
void
Gicv3CPUInterface::assertWakeRequest()
{
auto *tc = gic->getSystem()->threads[cpuId];
if (ArmSystem::callSetWakeRequest(tc)) {
Reset().invoke(tc);
tc->activate();
}
}
void
Gicv3CPUInterface::deassertWakeRequest()
{
auto *tc = gic->getSystem()->threads[cpuId];
ArmSystem::callClearWakeRequest(tc);
}
void
Gicv3CPUInterface::copy(Gicv3Registers *from, Gicv3Registers *to)
{
const auto affinity = redistributor->getAffinity();
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_PMR_EL1);
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_AP1R0_EL1);
if (PRIORITY_BITS >= 6) {
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_AP1R1_EL1);
}
if (PRIORITY_BITS >= 7) {
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_AP1R2_EL1);
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_AP1R3_EL1);
}
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_BPR1_EL1);
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_CTLR_EL1);
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_SRE_EL1);
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_IGRPEN0_EL1);
gic->copyCpuRegister(from, to, affinity, MISCREG_ICC_IGRPEN1_EL1);
}
void
Gicv3CPUInterface::serialize(CheckpointOut & cp) const
{
SERIALIZE_SCALAR(hppi.intid);
SERIALIZE_SCALAR(hppi.prio);
SERIALIZE_ENUM(hppi.group);
}
void
Gicv3CPUInterface::unserialize(CheckpointIn & cp)
{
UNSERIALIZE_SCALAR(hppi.intid);
UNSERIALIZE_SCALAR(hppi.prio);
UNSERIALIZE_ENUM(hppi.group);
}
} // namespace gem5