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/*
* Copyright (C) 2014 - Linaro
* Author: Rob Herring <rob.herring@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "kvm-consts.h"
#include "qemu/main-loop.h"
#include "sysemu/runstate.h"
#include "internals.h"
#include "arm-powerctl.h"
bool arm_is_psci_call(ARMCPU *cpu, int excp_type)
{
/*
* Return true if the exception type matches the configured PSCI conduit.
* This is called before the SMC/HVC instruction is executed, to decide
* whether we should treat it as a PSCI call or with the architecturally
* defined behaviour for an SMC or HVC (which might be UNDEF or trap
* to EL2 or to EL3).
*/
switch (excp_type) {
case EXCP_HVC:
if (cpu->psci_conduit != QEMU_PSCI_CONDUIT_HVC) {
return false;
}
break;
case EXCP_SMC:
if (cpu->psci_conduit != QEMU_PSCI_CONDUIT_SMC) {
return false;
}
break;
default:
return false;
}
return true;
}
void arm_handle_psci_call(ARMCPU *cpu)
{
/*
* This function partially implements the logic for dispatching Power State
* Coordination Interface (PSCI) calls (as described in ARM DEN 0022B.b),
* to the extent required for bringing up and taking down secondary cores,
* and for handling reset and poweroff requests.
* Additional information about the calling convention used is available in
* the document 'SMC Calling Convention' (ARM DEN 0028)
*/
CPUARMState *env = &cpu->env;
uint64_t param[4];
uint64_t context_id, mpidr;
target_ulong entry;
int32_t ret = 0;
int i;
for (i = 0; i < 4; i++) {
/*
* All PSCI functions take explicit 32-bit or native int sized
* arguments so we can simply zero-extend all arguments regardless
* of which exact function we are about to call.
*/
param[i] = is_a64(env) ? env->xregs[i] : env->regs[i];
}
if ((param[0] & QEMU_PSCI_0_2_64BIT) && !is_a64(env)) {
ret = QEMU_PSCI_RET_INVALID_PARAMS;
goto err;
}
switch (param[0]) {
CPUState *target_cpu_state;
ARMCPU *target_cpu;
case QEMU_PSCI_0_2_FN_PSCI_VERSION:
ret = QEMU_PSCI_0_2_RET_VERSION_0_2;
break;
case QEMU_PSCI_0_2_FN_MIGRATE_INFO_TYPE:
ret = QEMU_PSCI_0_2_RET_TOS_MIGRATION_NOT_REQUIRED; /* No trusted OS */
break;
case QEMU_PSCI_0_2_FN_AFFINITY_INFO:
case QEMU_PSCI_0_2_FN64_AFFINITY_INFO:
mpidr = param[1];
switch (param[2]) {
case 0:
target_cpu_state = arm_get_cpu_by_id(mpidr);
if (!target_cpu_state) {
ret = QEMU_PSCI_RET_INVALID_PARAMS;
break;
}
target_cpu = ARM_CPU(target_cpu_state);
g_assert(qemu_mutex_iothread_locked());
ret = target_cpu->power_state;
break;
default:
/* Everything above affinity level 0 is always on. */
ret = 0;
}
break;
case QEMU_PSCI_0_2_FN_SYSTEM_RESET:
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
/* QEMU reset and shutdown are async requests, but PSCI
* mandates that we never return from the reset/shutdown
* call, so power the CPU off now so it doesn't execute
* anything further.
*/
goto cpu_off;
case QEMU_PSCI_0_2_FN_SYSTEM_OFF:
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
goto cpu_off;
case QEMU_PSCI_0_1_FN_CPU_ON:
case QEMU_PSCI_0_2_FN_CPU_ON:
case QEMU_PSCI_0_2_FN64_CPU_ON:
{
/* The PSCI spec mandates that newly brought up CPUs start
* in the highest exception level which exists and is enabled
* on the calling CPU. Since the QEMU PSCI implementation is
* acting as a "fake EL3" or "fake EL2" firmware, this for us
* means that we want to start at the highest NS exception level
* that we are providing to the guest.
* The execution mode should be that which is currently in use
* by the same exception level on the calling CPU.
* The CPU should be started with the context_id value
* in x0 (if AArch64) or r0 (if AArch32).
*/
int target_el = arm_feature(env, ARM_FEATURE_EL2) ? 2 : 1;
bool target_aarch64 = arm_el_is_aa64(env, target_el);
mpidr = param[1];
entry = param[2];
context_id = param[3];
ret = arm_set_cpu_on(mpidr, entry, context_id,
target_el, target_aarch64);
break;
}
case QEMU_PSCI_0_1_FN_CPU_OFF:
case QEMU_PSCI_0_2_FN_CPU_OFF:
goto cpu_off;
case QEMU_PSCI_0_1_FN_CPU_SUSPEND:
case QEMU_PSCI_0_2_FN_CPU_SUSPEND:
case QEMU_PSCI_0_2_FN64_CPU_SUSPEND:
/* Affinity levels are not supported in QEMU */
if (param[1] & 0xfffe0000) {
ret = QEMU_PSCI_RET_INVALID_PARAMS;
break;
}
/* Powerdown is not supported, we always go into WFI */
if (is_a64(env)) {
env->xregs[0] = 0;
} else {
env->regs[0] = 0;
}
helper_wfi(env, 4);
break;
case QEMU_PSCI_0_1_FN_MIGRATE:
case QEMU_PSCI_0_2_FN_MIGRATE:
default:
ret = QEMU_PSCI_RET_NOT_SUPPORTED;
break;
}
err:
if (is_a64(env)) {
env->xregs[0] = ret;
} else {
env->regs[0] = ret;
}
return;
cpu_off:
ret = arm_set_cpu_off(cpu->mp_affinity);
/* notreached */
/* sanity check in case something failed */
assert(ret == QEMU_ARM_POWERCTL_RET_SUCCESS);
}
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