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ArmPkg: Handle warm reboot request correctly
The warm reboot requests from OSPM are mapped to cold reboot. To handle the warm reboot separately from a cold reboot, update ArmSmcPsciResetSystemLib and to invoke the PSCI call with parameters for warm reboot. Signed-off-by: Pranav Madhu <pranav.madhu@arm.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
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@ -93,6 +93,8 @@
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#define ARM_SMC_ID_PSCI_MIGRATE_AARCH32 0x84000005
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#define ARM_SMC_ID_PSCI_SYSTEM_OFF 0x84000008
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#define ARM_SMC_ID_PSCI_SYSTEM_RESET 0x84000009
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#define ARM_SMC_ID_PSCI_FEATURES 0x8400000A
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#define ARM_SMC_ID_PSCI_SYSTEM_RESET2_AARCH64 0xC4000012
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/* The current PSCI version is: 0.2 */
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#define ARM_SMC_PSCI_VERSION_MAJOR 0
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@ -3,6 +3,7 @@
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Copyright (c) 2017 - 2018, Linaro Ltd. All rights reserved.<BR>
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Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2022, Arm Limited. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@ -47,8 +48,24 @@ ResetWarm (
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VOID
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)
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{
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// Map a warm reset into a cold reset
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ResetCold ();
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UINTN Arg1;
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UINTN Ret;
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Arg1 = ARM_SMC_ID_PSCI_SYSTEM_RESET2_AARCH64;
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// Is SYSTEM_RESET2 supported?
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Ret = ArmCallSmc0 (ARM_SMC_ID_PSCI_FEATURES, &Arg1, NULL, NULL);
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if (Ret == ARM_SMC_PSCI_RET_SUCCESS) {
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// Send PSCI SYSTEM_RESET2 command
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ArmCallSmc0 (Arg1, NULL, NULL, NULL);
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} else {
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// Map a warm reset into a cold reset
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DEBUG ((
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DEBUG_INFO,
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"Warm reboot not supported by platform, issuing cold reboot\n"
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));
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ResetCold ();
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}
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}
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/**
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