arch/xtensa/include/asm/io.h

Source file repositories/reference/linux-study-clean/arch/xtensa/include/asm/io.h

File Facts

System
Linux kernel
Corpus path
arch/xtensa/include/asm/io.h
Extension
.h
Size
1564 bytes
Lines
63
Domain
Architecture Layer
Bucket
arch/xtensa
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _XTENSA_IO_H
#define _XTENSA_IO_H

#include <asm/byteorder.h>
#include <asm/page.h>
#include <asm/vectors.h>
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/pgtable.h>

#include <linux/types.h>

#define IOADDR(x)		(XCHAL_KIO_BYPASS_VADDR + (x))
#define IO_SPACE_LIMIT ~0
#define PCI_IOBASE		((void __iomem *)XCHAL_KIO_BYPASS_VADDR)

#ifdef CONFIG_MMU
/*
 * I/O memory mapping functions.
 */
void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
			   pgprot_t prot);
#define ioremap_prot ioremap_prot
#define iounmap iounmap

static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
{
	if (offset >= XCHAL_KIO_PADDR
	    && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
	else
		return ioremap_prot(offset, size,
				    pgprot_noncached(PAGE_KERNEL));
}
#define ioremap ioremap

static inline void __iomem *ioremap_cache(unsigned long offset,
		unsigned long size)
{
	if (offset >= XCHAL_KIO_PADDR
	    && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
	else
		return ioremap_prot(offset, size, PAGE_KERNEL);

}
#define ioremap_cache ioremap_cache
#endif /* CONFIG_MMU */

#include <asm-generic/io.h>

#endif	/* _XTENSA_IO_H */

Annotation

Implementation Notes