arch/openrisc/include/asm/io.h

File Facts

System

Linux kernel

Corpus path

arch/openrisc/include/asm/io.h

Extension

.h

Size

808 bytes

Lines

40

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.

Dependency Surface

• linux/types.h
• asm/pgalloc.h
• asm/pgtable.h
• asm-generic/io.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#ifndef __ASM_OPENRISC_IO_H
#define __ASM_OPENRISC_IO_H

#include <linux/types.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>

/*
 * PCI: We do not use IO ports in OpenRISC
 */
#define IO_SPACE_LIMIT		0

/* OpenRISC has no port IO */
#define HAVE_ARCH_PIO_SIZE	1
#define PIO_RESERVED		0X0UL
#define PIO_OFFSET		0
#define PIO_MASK		0

/*
 * I/O memory mapping functions.
 */
#define _PAGE_IOREMAP (pgprot_val(PAGE_KERNEL) | _PAGE_CI)

#include <asm-generic/io.h>

#endif

Annotation

• Immediate include surface: `linux/types.h`, `asm/pgalloc.h`, `asm/pgtable.h`, `asm-generic/io.h`.
• 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.