arch/openrisc/include/asm/fpu.h

File Facts

System

Linux kernel

Corpus path

arch/openrisc/include/asm/fpu.h

Extension

.h

Size

468 bytes

Lines

23

Domain

Architecture Layer

Bucket

arch/openrisc

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

• struct task_struct
• function save_fpu
• function restore_fpu

Annotated Snippet

#ifndef __ASM_OPENRISC_FPU_H
#define __ASM_OPENRISC_FPU_H

struct task_struct;

#ifdef CONFIG_FPU
static inline void save_fpu(struct task_struct *task)
{
	task->thread.fpcsr = mfspr(SPR_FPCSR);
}

static inline void restore_fpu(struct task_struct *task)
{
	mtspr(SPR_FPCSR, task->thread.fpcsr);
}
#else
#define save_fpu(tsk)			do { } while (0)
#define restore_fpu(tsk)		do { } while (0)
#endif

#endif /* __ASM_OPENRISC_FPU_H */

Annotation

• Detected declarations: `struct task_struct`, `function save_fpu`, `function restore_fpu`.
• Atlas domain: Architecture Layer / arch/openrisc.
• 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.