arch/powerpc/math-emu/fneg.c

File Facts

System

Linux kernel

Corpus path

arch/powerpc/math-emu/fneg.c

Extension

.c

Size

312 bytes

Lines

20

Domain

Architecture Layer

Bucket

arch/powerpc

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
• linux/errno.h
• linux/uaccess.h

Detected Declarations

• function fneg

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/uaccess.h>

int
fneg(u32 *frD, u32 *frB)
{
	frD[0] = frB[0] ^ 0x80000000;
	frD[1] = frB[1];

#ifdef DEBUG
	printk("%s: D %p, B %p: ", __func__, frD, frB);
	dump_double(frD);
	printk("\n");
#endif

	return 0;
}

Annotation

• Immediate include surface: `linux/types.h`, `linux/errno.h`, `linux/uaccess.h`.
• Detected declarations: `function fneg`.
• Atlas domain: Architecture Layer / arch/powerpc.
• 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.