arch/sh/kernel/ioport.c

Source file repositories/reference/linux-study-clean/arch/sh/kernel/ioport.c

File Facts

System
Linux kernel
Corpus path
arch/sh/kernel/ioport.c
Extension
.c
Size
537 bytes
Lines
26
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * arch/sh/kernel/ioport.c
 *
 * Copyright (C) 2000  Niibe Yutaka
 * Copyright (C) 2005 - 2007 Paul Mundt
 */
#include <linux/module.h>
#include <linux/io.h>
#include <asm/io_trapped.h>

unsigned long sh_io_port_base __read_mostly = -1;
EXPORT_SYMBOL(sh_io_port_base);

void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
	void __iomem *ret;

	ret = __ioport_map_trapped(port, nr);
	if (ret)
		return ret;

	return (void __iomem *)(port + sh_io_port_base);
}
EXPORT_SYMBOL(ioport_map);

Annotation

Implementation Notes