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Currently the Arm arm-powerctl.h APIs allow: * arm_set_cpu_on(), which powers on a CPU and sets its initial PC and other startup state * arm_reset_cpu(), which resets a CPU which is already on (and fails if the CPU is powered off) but there is no way to say "power on a CPU as if it had just come out of reset and don't do anything else to it". Add a new function arm_set_cpu_on_and_reset(), which does this. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20190219125808.25174-5-peter.maydell@linaro.org
94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
/*
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* QEMU support -- ARM Power Control specific functions.
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*
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* Copyright (c) 2016 Jean-Christophe Dubois
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_ARM_POWERCTL_H
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#define QEMU_ARM_POWERCTL_H
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#include "kvm-consts.h"
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#define QEMU_ARM_POWERCTL_RET_SUCCESS QEMU_PSCI_RET_SUCCESS
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#define QEMU_ARM_POWERCTL_INVALID_PARAM QEMU_PSCI_RET_INVALID_PARAMS
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#define QEMU_ARM_POWERCTL_ALREADY_ON QEMU_PSCI_RET_ALREADY_ON
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#define QEMU_ARM_POWERCTL_IS_OFF QEMU_PSCI_RET_DENIED
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#define QEMU_ARM_POWERCTL_ON_PENDING QEMU_PSCI_RET_ON_PENDING
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/*
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* arm_get_cpu_by_id:
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* @cpuid: the id of the CPU we want to retrieve the state
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*
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* Retrieve a CPUState object from its CPU ID provided in @cpuid.
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*
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* Returns: a pointer to the CPUState structure of the requested CPU.
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*/
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CPUState *arm_get_cpu_by_id(uint64_t cpuid);
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/*
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* arm_set_cpu_on:
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* @cpuid: the id of the CPU we want to start/wake up.
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* @entry: the address the CPU shall start from.
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* @context_id: the value to put in r0/x0.
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* @target_el: The desired exception level.
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* @target_aa64: 1 if the requested mode is AArch64. 0 otherwise.
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*
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* Start the cpu designated by @cpuid in @target_el exception level. The mode
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* shall be AArch64 if @target_aa64 is set to 1. Otherwise the mode is
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* AArch32. The CPU shall start at @entry with @context_id in r0/x0.
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*
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* Returns: QEMU_ARM_POWERCTL_RET_SUCCESS on success.
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* QEMU_ARM_POWERCTL_INVALID_PARAM if bad parameters are provided.
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* QEMU_ARM_POWERCTL_ALREADY_ON if the CPU was already started.
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* QEMU_ARM_POWERCTL_ON_PENDING if the CPU is still powering up
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*/
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int arm_set_cpu_on(uint64_t cpuid, uint64_t entry, uint64_t context_id,
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uint32_t target_el, bool target_aa64);
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/*
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* arm_set_cpu_off:
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* @cpuid: the id of the CPU we want to stop/shut down.
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*
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* Stop the cpu designated by @cpuid.
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*
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* Returns: QEMU_ARM_POWERCTL_RET_SUCCESS on success.
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* QEMU_ARM_POWERCTL_INVALID_PARAM if bad parameters are provided.
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* QEMU_ARM_POWERCTL_IS_OFF if CPU is already off
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*/
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int arm_set_cpu_off(uint64_t cpuid);
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/*
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* arm_reset_cpu:
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* @cpuid: the id of the CPU we want to reset.
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*
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* Reset the cpu designated by @cpuid.
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*
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* Returns: QEMU_ARM_POWERCTL_RET_SUCCESS on success.
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* QEMU_ARM_POWERCTL_INVALID_PARAM if bad parameters are provided.
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* QEMU_ARM_POWERCTL_IS_OFF if CPU is off
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*/
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int arm_reset_cpu(uint64_t cpuid);
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/*
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* arm_set_cpu_on_and_reset:
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* @cpuid: the id of the CPU we want to star
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*
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* Start the cpu designated by @cpuid and put it through its normal
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* CPU reset process. The CPU will start in the way it is architected
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* to start after a power-on reset.
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*
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* Returns: QEMU_ARM_POWERCTL_RET_SUCCESS on success.
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* QEMU_ARM_POWERCTL_INVALID_PARAM if there is no CPU with that ID.
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* QEMU_ARM_POWERCTL_ALREADY_ON if the CPU is already on.
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* QEMU_ARM_POWERCTL_ON_PENDING if the CPU is already partway through
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* powering on.
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*/
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int arm_set_cpu_on_and_reset(uint64_t cpuid);
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#endif
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