include/asm-generic/video.h

Source file repositories/reference/linux-study-clean/include/asm-generic/video.h

File Facts

System
Linux kernel
Corpus path
include/asm-generic/video.h
Extension
.h
Size
2925 bytes
Lines
137
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __ASM_GENERIC_VIDEO_H_
#define __ASM_GENERIC_VIDEO_H_

/*
 * Only include this header file from your architecture's <asm/fb.h>.
 */

#include <linux/io.h>
#include <linux/mm_types.h>
#include <linux/pgtable.h>
#include <linux/types.h>

struct device;

#ifndef pgprot_framebuffer
#define pgprot_framebuffer pgprot_framebuffer
static inline pgprot_t pgprot_framebuffer(pgprot_t prot,
					  unsigned long vm_start, unsigned long vm_end,
					  unsigned long offset)
{
	return pgprot_writecombine(prot);
}
#endif

#ifndef video_is_primary_device
#define video_is_primary_device video_is_primary_device
static inline bool video_is_primary_device(struct device *dev)
{
	return false;
}
#endif

/*
 * I/O helpers for the framebuffer. Prefer these functions over their
 * regular counterparts. The regular I/O functions provide in-order
 * access and swap bytes to/from little-endian ordering. Neither is
 * required for framebuffers. Instead, the helpers read and write
 * raw framebuffer data. Independent operations can be reordered for
 * improved performance.
 */

#ifndef fb_readb
static inline u8 fb_readb(const volatile void __iomem *addr)
{
	return __raw_readb(addr);
}
#define fb_readb fb_readb
#endif

#ifndef fb_readw
static inline u16 fb_readw(const volatile void __iomem *addr)
{
	return __raw_readw(addr);
}
#define fb_readw fb_readw
#endif

#ifndef fb_readl
static inline u32 fb_readl(const volatile void __iomem *addr)
{
	return __raw_readl(addr);
}
#define fb_readl fb_readl
#endif

#ifndef fb_readq
#if defined(__raw_readq)
static inline u64 fb_readq(const volatile void __iomem *addr)
{
	return __raw_readq(addr);
}
#define fb_readq fb_readq
#endif
#endif

#ifndef fb_writeb
static inline void fb_writeb(u8 b, volatile void __iomem *addr)
{
	__raw_writeb(b, addr);
}
#define fb_writeb fb_writeb
#endif

#ifndef fb_writew
static inline void fb_writew(u16 b, volatile void __iomem *addr)
{
	__raw_writew(b, addr);
}
#define fb_writew fb_writew
#endif

Annotation

Implementation Notes