arch/s390/include/asm/itcw.h

File Facts

System

Linux kernel

Corpus path

arch/s390/include/asm/itcw.h

Extension

.h

Size

950 bytes

Lines

32

Domain

Architecture Layer

Bucket

arch/s390

Inferred role

Architecture Layer: implementation source

Status

source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h
• asm/fcx.h

Detected Declarations

• struct itcw

Annotated Snippet

#ifndef _ASM_S390_ITCW_H
#define _ASM_S390_ITCW_H

#include <linux/types.h>
#include <asm/fcx.h>

#define ITCW_OP_READ	0
#define ITCW_OP_WRITE	1

struct itcw;

struct tcw *itcw_get_tcw(struct itcw *itcw);
size_t itcw_calc_size(int intrg, int max_tidaws, int intrg_max_tidaws);
struct itcw *itcw_init(void *buffer, size_t size, int op, int intrg,
		       int max_tidaws, int intrg_max_tidaws);
struct dcw *itcw_add_dcw(struct itcw *itcw, u8 cmd, u8 flags, void *cd,
			 u8 cd_count, u32 count);
struct tidaw *itcw_add_tidaw(struct itcw *itcw, u8 flags, void *addr,
			     u32 count);
void itcw_set_data(struct itcw *itcw, void *addr, int use_tidal);
void itcw_finalize(struct itcw *itcw);

#endif /* _ASM_S390_ITCW_H */

Annotation

• Immediate include surface: `linux/types.h`, `asm/fcx.h`.
• Detected declarations: `struct itcw`.
• Atlas domain: Architecture Layer / arch/s390.
• 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.