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ArmPkg: Handle warm reboot request correctly

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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>
This commit is contained in:
Pranav Madhu 2022-08-24 22:14:21 +05:30 committed by mergify[bot]
parent aefcc91805
commit 52bf4eba45
2 changed files with 21 additions and 2 deletions
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2
ArmPkg/Include/IndustryStandard/ArmStdSmc.h
View File

@ -93,6 +93,8 @@
#define ARM_SMC_ID_PSCI_MIGRATE_AARCH32 0x84000005
#define ARM_SMC_ID_PSCI_SYSTEM_OFF 0x84000008
#define ARM_SMC_ID_PSCI_SYSTEM_RESET 0x84000009
#define ARM_SMC_ID_PSCI_FEATURES 0x8400000A
#define ARM_SMC_ID_PSCI_SYSTEM_RESET2_AARCH64 0xC4000012
/* The current PSCI version is: 0.2 */
#define ARM_SMC_PSCI_VERSION_MAJOR 0

21
ArmPkg/Library/ArmSmcPsciResetSystemLib/ArmSmcPsciResetSystemLib.c
View File

@ -3,6 +3,7 @@
Copyright (c) 2017 - 2018, Linaro Ltd. All rights reserved.<BR>
Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2022, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@ -47,8 +48,24 @@ ResetWarm (
VOID
)
{
// Map a warm reset into a cold reset
ResetCold ();
UINTN Arg1;
UINTN Ret;
Arg1 = ARM_SMC_ID_PSCI_SYSTEM_RESET2_AARCH64;
// Is SYSTEM_RESET2 supported?
Ret = ArmCallSmc0 (ARM_SMC_ID_PSCI_FEATURES, &Arg1, NULL, NULL);
if (Ret == ARM_SMC_PSCI_RET_SUCCESS) {
// Send PSCI SYSTEM_RESET2 command
ArmCallSmc0 (Arg1, NULL, NULL, NULL);
} else {
// Map a warm reset into a cold reset
DEBUG ((
DEBUG_INFO,
"Warm reboot not supported by platform, issuing cold reboot\n"
));
ResetCold ();
}
}
/**