include/linux/purgatory.h

File Facts

System

Linux kernel

Corpus path

include/linux/purgatory.h

Extension

.h

Size

590 bytes

Lines

25

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h
• crypto/sha2.h
• uapi/linux/kexec.h

Detected Declarations

• struct kexec_sha_region

Annotated Snippet

struct kexec_sha_region {
	unsigned long start;
	unsigned long len;
};

/*
 * These forward declarations serve two purposes:
 *
 * 1) Make sparse happy when checking arch/purgatory
 * 2) Document that these are required to be global so the symbol
 *    lookup in kexec works
 */
extern struct kexec_sha_region purgatory_sha_regions[KEXEC_SEGMENT_MAX];
extern u8 purgatory_sha256_digest[SHA256_DIGEST_SIZE];

#endif

Annotation

• Immediate include surface: `linux/types.h`, `crypto/sha2.h`, `uapi/linux/kexec.h`.
• Detected declarations: `struct kexec_sha_region`.
• Atlas domain: Core OS / Core Kernel Interface.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.