arch/x86/kernel/fpu/internal.h

File Facts

System

Linux kernel

Corpus path

arch/x86/kernel/fpu/internal.h

Extension

.h

Size

657 bytes

Lines

29

Domain

Architecture Layer

Bucket

arch/x86

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

• No C-style include directives detected by the generator.

Detected Declarations

• function use_xsave
• function use_fxsr

Annotated Snippet

#ifndef __X86_KERNEL_FPU_INTERNAL_H
#define __X86_KERNEL_FPU_INTERNAL_H

extern struct fpstate init_fpstate;

/* CPU feature check wrappers */
static __always_inline __pure bool use_xsave(void)
{
	return cpu_feature_enabled(X86_FEATURE_XSAVE);
}

static __always_inline __pure bool use_fxsr(void)
{
	return cpu_feature_enabled(X86_FEATURE_FXSR);
}

#ifdef CONFIG_X86_DEBUG_FPU
# define WARN_ON_FPU(x) WARN_ON_ONCE(x)
#else
# define WARN_ON_FPU(x) ({ BUILD_BUG_ON_INVALID(x); 0; })
#endif

/* Used in init.c */
extern void fpstate_init_user(struct fpstate *fpstate);
extern void fpstate_reset(struct fpu *fpu);

#endif

Annotation

• Detected declarations: `function use_xsave`, `function use_fxsr`.
• Atlas domain: Architecture Layer / arch/x86.
• 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.