arch/xtensa/mm/ioremap.c

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

File Facts

System
Linux kernel
Corpus path
arch/xtensa/mm/ioremap.c
Extension
.c
Size
808 bytes
Lines
36
Domain
Architecture Layer
Bucket
arch/xtensa
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-only
/*
 * ioremap implementation.
 *
 * Copyright (C) 2015 Cadence Design Systems Inc.
 */

#include <linux/io.h>
#include <linux/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/io.h>

void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
			   pgprot_t prot)
{
	unsigned long pfn = __phys_to_pfn((phys_addr));
	WARN_ON(pfn_valid(pfn));

	return generic_ioremap_prot(phys_addr, size, prot);
}
EXPORT_SYMBOL(ioremap_prot);

void iounmap(volatile void __iomem *addr)
{
	unsigned long va = (unsigned long) addr;

	if ((va >= XCHAL_KIO_CACHED_VADDR &&
	      va - XCHAL_KIO_CACHED_VADDR < XCHAL_KIO_SIZE) ||
	    (va >= XCHAL_KIO_BYPASS_VADDR &&
	      va - XCHAL_KIO_BYPASS_VADDR < XCHAL_KIO_SIZE))
		return;

	generic_iounmap(addr);
}
EXPORT_SYMBOL(iounmap);

Annotation

Implementation Notes