arch/um/include/asm/fpu/api.h

File Facts

System

Linux kernel

Corpus path

arch/um/include/asm/fpu/api.h

Extension

.h

Size

473 bytes

Lines

23

Domain

Architecture Layer

Bucket

arch/um

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.

Dependency Surface

• linux/types.h

Detected Declarations

• function Copyright

Annotated Snippet

#ifndef _ASM_UM_FPU_API_H
#define _ASM_UM_FPU_API_H

#include <linux/types.h>

/* Copyright (c) 2020 Cambridge Greys Ltd
 * Copyright (c) 2020 Red Hat Inc.
 * A set of "dummy" defines to allow the direct inclusion
 * of x86 optimized copy, xor, etc routines into the
 * UML code tree. */

#define kernel_fpu_begin() (void)0
#define kernel_fpu_end() (void)0

static inline bool irq_fpu_usable(void)
{
	return true;
}


#endif

Annotation

• Immediate include surface: `linux/types.h`.
• Detected declarations: `function Copyright`.
• Atlas domain: Architecture Layer / arch/um.
• 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.