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The C and C++ Include Header Files

cat -n /usr/include/linux/fdreg.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _LINUX_FDREG_H
     3	#define _LINUX_FDREG_H
     4	/*
     5	 * This file contains some defines for the floppy disk controller.
     6	 * Various sources. Mostly "IBM Microcomputers: A Programmers
     7	 * Handbook", Sanches and Canton.
     8	 */
     9	
    10	/* 82077's auxiliary status registers A & B (R) */
    11	#define FD_SRA		0
    12	#define FD_SRB		1
    13	
    14	/* Digital Output Register */
    15	#define FD_DOR		2
    16	
    17	/* 82077's tape drive register (R/W) */
    18	#define FD_TDR		3
    19	
    20	/* 82077's data rate select register (W) */
    21	#define FD_DSR		4
    22	
    23	/* Fd controller regs. S&C, about page 340 */
    24	#define FD_STATUS	4
    25	#define FD_DATA		5
    26	
    27	/* Digital Input Register (read) */
    28	#define FD_DIR		7
    29	
    30	/* Diskette Control Register (write)*/
    31	#define FD_DCR		7
    32	
    33	/* Bits of main status register */
    34	#define STATUS_BUSYMASK	0x0F		/* drive busy mask */
    35	#define STATUS_BUSY	0x10		/* FDC busy */
    36	#define STATUS_DMA	0x20		/* 0- DMA mode */
    37	#define STATUS_DIR	0x40		/* 0- cpu->fdc */
    38	#define STATUS_READY	0x80		/* Data reg ready */
    39	
    40	/* Bits of FD_ST0 */
    41	#define ST0_DS		0x03		/* drive select mask */
    42	#define ST0_HA		0x04		/* Head (Address) */
    43	#define ST0_NR		0x08		/* Not Ready */
    44	#define ST0_ECE		0x10		/* Equipment check error */
    45	#define ST0_SE		0x20		/* Seek end */
    46	#define ST0_INTR	0xC0		/* Interrupt code mask */
    47	
    48	/* Bits of FD_ST1 */
    49	#define ST1_MAM		0x01		/* Missing Address Mark */
    50	#define ST1_WP		0x02		/* Write Protect */
    51	#define ST1_ND		0x04		/* No Data - unreadable */
    52	#define ST1_OR		0x10		/* OverRun */
    53	#define ST1_CRC		0x20		/* CRC error in data or addr */
    54	#define ST1_EOC		0x80		/* End Of Cylinder */
    55	
    56	/* Bits of FD_ST2 */
    57	#define ST2_MAM		0x01		/* Missing Address Mark (again) */
    58	#define ST2_BC		0x02		/* Bad Cylinder */
    59	#define ST2_SNS		0x04		/* Scan Not Satisfied */
    60	#define ST2_SEH		0x08		/* Scan Equal Hit */
    61	#define ST2_WC		0x10		/* Wrong Cylinder */
    62	#define ST2_CRC		0x20		/* CRC error in data field */
    63	#define ST2_CM		0x40		/* Control Mark = deleted */
    64	
    65	/* Bits of FD_ST3 */
    66	#define ST3_HA		0x04		/* Head (Address) */
    67	#define ST3_DS		0x08		/* drive is double-sided */
    68	#define ST3_TZ		0x10		/* Track Zero signal (1=track 0) */
    69	#define ST3_RY		0x20		/* drive is ready */
    70	#define ST3_WP		0x40		/* Write Protect */
    71	#define ST3_FT		0x80		/* Drive Fault */
    72	
    73	/* Values for FD_COMMAND */
    74	#define FD_RECALIBRATE		0x07	/* move to track 0 */
    75	#define FD_SEEK			0x0F	/* seek track */
    76	#define FD_READ			0xE6	/* read with MT, MFM, SKip deleted */
    77	#define FD_WRITE		0xC5	/* write with MT, MFM */
    78	#define FD_SENSEI		0x08	/* Sense Interrupt Status */
    79	#define FD_SPECIFY		0x03	/* specify HUT etc */
    80	#define FD_FORMAT		0x4D	/* format one track */
    81	#define FD_VERSION		0x10	/* get version code */
    82	#define FD_CONFIGURE		0x13	/* configure FIFO operation */
    83	#define FD_PERPENDICULAR	0x12	/* perpendicular r/w mode */
    84	#define FD_GETSTATUS		0x04	/* read ST3 */
    85	#define FD_DUMPREGS		0x0E	/* dump the contents of the fdc regs */
    86	#define FD_READID		0xEA	/* prints the header of a sector */
    87	#define FD_UNLOCK		0x14	/* Fifo config unlock */
    88	#define FD_LOCK			0x94	/* Fifo config lock */
    89	#define FD_RSEEK_OUT		0x8f	/* seek out (i.e. to lower tracks) */
    90	#define FD_RSEEK_IN		0xcf	/* seek in (i.e. to higher tracks) */
    91	
    92	/* the following commands are new in the 82078. They are not used in the
    93	 * floppy driver, except the first three. These commands may be useful for apps
    94	 * which use the FDRAWCMD interface. For doc, get the 82078 spec sheets at
    95	 * http://www.intel.com/design/archives/periphrl/docs/29046803.htm */
    96	
    97	#define FD_PARTID		0x18	/* part id ("extended" version cmd) */
    98	#define FD_SAVE			0x2e	/* save fdc regs for later restore */
    99	#define FD_DRIVESPEC		0x8e	/* drive specification: Access to the
   100						 * 2 Mbps data transfer rate for tape
   101						 * drives */
   102	
   103	#define FD_RESTORE		0x4e    /* later restore */
   104	#define FD_POWERDOWN		0x27	/* configure FDC's powersave features */
   105	#define FD_FORMAT_N_WRITE	0xef    /* format and write in one go. */
   106	#define FD_OPTION		0x33	/* ISO format (which is a clean way to
   107						 * pack more sectors on a track) */
   108	
   109	/* DMA commands */
   110	#define DMA_READ	0x46
   111	#define DMA_WRITE	0x4A
   112	
   113	/* FDC version return types */
   114	#define FDC_NONE	0x00
   115	#define FDC_UNKNOWN	0x10	/* DO NOT USE THIS TYPE EXCEPT IF IDENTIFICATION
   116					   FAILS EARLY */
   117	#define FDC_8272A	0x20	/* Intel 8272a, NEC 765 */
   118	#define FDC_765ED	0x30	/* Non-Intel 1MB-compatible FDC, can't detect */
   119	#define FDC_82072	0x40	/* Intel 82072; 8272a + FIFO + DUMPREGS */
   120	#define FDC_82072A	0x45	/* 82072A (on Sparcs) */
   121	#define FDC_82077_ORIG	0x51	/* Original version of 82077AA, sans LOCK */
   122	#define FDC_82077	0x52	/* 82077AA-1 */
   123	#define FDC_82078_UNKN	0x5f	/* Unknown 82078 variant */
   124	#define FDC_82078	0x60	/* 44pin 82078 or 64pin 82078SL */
   125	#define FDC_82078_1	0x61	/* 82078-1 (2Mbps fdc) */
   126	#define FDC_S82078B	0x62	/* S82078B (first seen on Adaptec AVA-2825 VLB
   127					 * SCSI/EIDE/Floppy controller) */
   128	#define FDC_87306	0x63	/* National Semiconductor PC 87306 */
   129	
   130	/*
   131	 * Beware: the fdc type list is roughly sorted by increasing features.
   132	 * Presence of features is tested by comparing the FDC version id with the
   133	 * "oldest" version that has the needed feature.
   134	 * If during FDC detection, an obscure test fails late in the sequence, don't
   135	 * assign FDC_UNKNOWN. Else the FDC will be treated as a dumb 8272a, or worse.
   136	 * This is especially true if the tests are unneeded.
   137	 */
   138	
   139	#define FD_RESET_DELAY 20
   140	#endif