include/uapi/linux/fd.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/fd.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/fd.h
Extension
.h
Size
12166 bytes
Lines
403
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct floppy_struct {
	unsigned int	size,		/* nr of sectors total */
			sect,		/* sectors per track */
			head,		/* nr of heads */
			track,		/* nr of tracks */
			stretch;	/* bit 0 !=0 means double track steps */
					/* bit 1 != 0 means swap sides */
					/* bits 2..9 give the first sector */
					/*  number (the LSB is flipped) */
#define FD_STRETCH 1
#define FD_SWAPSIDES 2
#define FD_ZEROBASED 4
#define FD_SECTBASEMASK 0x3FC
#define FD_MKSECTBASE(s) (((s) ^ 1) << 2)
#define FD_SECTBASE(floppy) ((((floppy)->stretch & FD_SECTBASEMASK) >> 2) ^ 1)

	unsigned char	gap,		/* gap1 size */

			rate,		/* data rate. |= 0x40 for perpendicular */
#define FD_2M 0x4
#define FD_SIZECODEMASK 0x38
#define FD_SIZECODE(floppy) (((((floppy)->rate&FD_SIZECODEMASK)>> 3)+ 2) %8)
#define FD_SECTSIZE(floppy) ( (floppy)->rate & FD_2M ? \
			     512 : 128 << FD_SIZECODE(floppy) )
#define FD_PERP 0x40

			spec1,		/* stepping rate, head unload time */
			fmt_gap;	/* gap2 size */
	const char	* name; /* used only for predefined formats */
};


/* commands needing write access have 0x40 set */
/* commands needing super user access have 0x80 set */

#define FDCLRPRM _IO(2, 0x41)
/* clear user-defined parameters */

#define FDSETPRM _IOW(2, 0x42, struct floppy_struct)
#define FDSETMEDIAPRM FDSETPRM
/* set user-defined parameters for current media */

#define FDDEFPRM _IOW(2, 0x43, struct floppy_struct)
#define FDGETPRM _IOR(2, 0x04, struct floppy_struct)
#define FDDEFMEDIAPRM FDDEFPRM
#define FDGETMEDIAPRM FDGETPRM
/* set/get disk parameters */


#define	FDMSGON  _IO(2,0x45)
#define	FDMSGOFF _IO(2,0x46)
/* issue/don't issue kernel messages on media type change */


/*
 * Formatting (obsolete)
 */
#define FD_FILL_BYTE 0xF6 /* format fill byte. */

struct format_descr {
	unsigned int device,head,track;
};

#define FDFMTBEG _IO(2,0x47)
/* begin formatting a disk */
#define	FDFMTTRK _IOW(2,0x48, struct format_descr)
/* format the specified track */
#define FDFMTEND _IO(2,0x49)
/* end formatting a disk */


/*
 * Error thresholds
 */
struct floppy_max_errors {
	unsigned int
	  abort,      /* number of errors to be reached before aborting */
	  read_track, /* maximal number of errors permitted to read an
		       * entire track at once */
	  reset,      /* maximal number of errors before a reset is tried */
	  recal,      /* maximal number of errors before a recalibrate is
		       * tried */

	  /*
	   * Threshold for reporting FDC errors to the console.
	   * Setting this to zero may flood your screen when using
	   * ultra cheap floppies ;-)
	   */
	  reporting;

Annotation

Implementation Notes