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/* SPDX-License-Identifier: GPL-2.0-only */
/**
* DOC: Kexec Metadata ABI
*
* The "kexec-metadata" subtree stores optional metadata about the kexec chain.
* It is registered via kho_add_subtree(), keeping it independent from the core
* KHO ABI. This allows the metadata format to evolve without affecting other
* KHO consumers.
*
* The metadata is stored as a plain C struct rather than FDT format for
* simplicity and direct field access.
*
* Copyright (c) 2026 Meta Platforms, Inc. and affiliates.
* Copyright (c) 2026 Breno Leitao <leitao@debian.org>
*/
#ifndef _LINUX_KHO_ABI_KEXEC_METADATA_H
#define _LINUX_KHO_ABI_KEXEC_METADATA_H
#include <linux/types.h>
#include <linux/utsname.h>
#define KHO_KEXEC_METADATA_VERSION 1
/**
* struct kho_kexec_metadata - Kexec metadata passed between kernels
* @version: ABI version of this struct (must be first field)
* @previous_release: Kernel version string that initiated the kexec
* @kexec_count: Number of kexec boots since last cold boot
*
* This structure is preserved across kexec and allows the new kernel to
* identify which kernel it was booted from and how many kexec reboots
* have occurred.
*
* __NEW_UTS_LEN is part of uABI, so it safe to use it in here.
*/
struct kho_kexec_metadata {
u32 version;
char previous_release[__NEW_UTS_LEN + 1];
u32 kexec_count;
} __packed;
#define KHO_METADATA_NODE_NAME "kexec-metadata"
#endif /* _LINUX_KHO_ABI_KEXEC_METADATA_H */
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