arch/xtensa/include/asm/flat.h

File Facts

System

Linux kernel

Corpus path

arch/xtensa/include/asm/flat.h

Extension

.h

Size

442 bytes

Lines

20

Domain

Architecture Layer

Bucket

arch/xtensa

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/unaligned.h

Detected Declarations

• function flat_get_addr_from_rp
• function flat_put_addr_at_rp

Annotated Snippet

#ifndef __ASM_XTENSA_FLAT_H
#define __ASM_XTENSA_FLAT_H

#include <linux/unaligned.h>

static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
					u32 *addr)
{
	*addr = get_unaligned((__force u32 *)rp);
	return 0;
}
static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
{
	put_unaligned(addr, (__force u32 *)rp);
	return 0;
}

#endif /* __ASM_XTENSA_FLAT_H */

Annotation

• Immediate include surface: `linux/unaligned.h`.
• Detected declarations: `function flat_get_addr_from_rp`, `function flat_put_addr_at_rp`.
• Atlas domain: Architecture Layer / arch/xtensa.
• 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.