arch/arm/mach-rpc/include/mach/io.h

File Facts

System

Linux kernel

Corpus path

arch/arm/mach-rpc/include/mach/io.h

Extension

.h

Size

672 bytes

Lines

29

Domain

Architecture Layer

Bucket

arch/arm

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

• mach/hardware.h

Detected Declarations

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

Annotated Snippet

#ifndef __ASM_ARM_ARCH_IO_H
#define __ASM_ARM_ARCH_IO_H

#include <mach/hardware.h>

#define IO_SPACE_LIMIT 0xffff

/*
 * We need PC style IO addressing for:
 *  - floppy (at 0x3f2,0x3f4,0x3f5,0x3f7)
 *  - parport (at 0x278-0x27a, 0x27b-0x27f, 0x778-0x77a)
 *  - 8250 serial (only for compile)
 *
 * These peripherals are found in an area of MMIO which looks very much
 * like an ISA bus, but with registers at the low byte of each word.
 */
#define __io(a)		(PCIO_BASE + ((a) << 2))

#endif

Annotation

• Immediate include surface: `mach/hardware.h`.
• Atlas domain: Architecture Layer / arch/arm.
• 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.