arch/sh/kernel/io.c

File Facts

System

Linux kernel

Corpus path

arch/sh/kernel/io.c

Extension

.c

Size

2487 bytes

Lines

112

Domain

Architecture Layer

Bucket

arch/sh

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.

Dependency Surface

• linux/module.h
• linux/pci.h
• asm/machvec.h
• asm/io.h

Detected Declarations

• function Copyright
• function memcpy_toio
• function memset_io
• export memcpy_fromio
• export memcpy_toio
• export memset_io

Annotated Snippet

while (count) {
                count--;
                writeb(c, dst);
                dst++;
        }
}
EXPORT_SYMBOL(memset_io);

Annotation

• Immediate include surface: `linux/module.h`, `linux/pci.h`, `asm/machvec.h`, `asm/io.h`.
• Detected declarations: `function Copyright`, `function memcpy_toio`, `function memset_io`, `export memcpy_fromio`, `export memcpy_toio`, `export memset_io`.
• Atlas domain: Architecture Layer / arch/sh.
• Implementation status: integration 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.