arch/csky/mm/ioremap.c

Source file repositories/reference/linux-study-clean/arch/csky/mm/ioremap.c

File Facts

System
Linux kernel
Corpus path
arch/csky/mm/ioremap.c
Extension
.c
Size
485 bytes
Lines
20
Domain
Architecture Layer
Bucket
arch/csky
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
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.

#include <linux/export.h>
#include <linux/mm.h>
#include <linux/io.h>

pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
			      unsigned long size, pgprot_t vma_prot)
{
	if (!pfn_valid(pfn)) {
		return pgprot_noncached(vma_prot);
	} else if (file->f_flags & O_SYNC) {
		return pgprot_writecombine(vma_prot);
	}

	return vma_prot;
}
EXPORT_SYMBOL(phys_mem_access_prot);

Annotation

Implementation Notes