/* -*- C -*- * scullp.h -- definitions for the scullp char module * * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet * Copyright (C) 2001 O'Reilly & Associates * * The source code in this file can be freely used, adapted, * and redistributed in source or binary form, so long as an * acknowledgment appears in derived source files.  The citation * should list that the code comes from the book "Linux Device * Drivers" by Alessandro Rubini and Jonathan Corbet, published * by O'Reilly & Associates.   No warranty is attached; * we cannot take responsibility for errors or fitness for use. */#include <linux/ioctl.h>#include <linux/cdev.h>/* * Macros to help debugging */#undef PDEBUG             /* undef it, just in case */#ifdef SCULLP_DEBUG#  ifdef __KERNEL__     /* This one if debugging is on, and kernel space */#    define PDEBUG(fmt, args...) printk( KERN_DEBUG "scullp: " fmt, ## args)#  else     /* This one for user space */#    define PDEBUG(fmt, args...) fprintf(stderr, fmt, ## args)#  endif#else#  define PDEBUG(fmt, args...) /* not debugging: nothing */#endif#undef PDEBUGG#define PDEBUGG(fmt, args...) /* nothing: it's a placeholder */#define SCULLP_MAJOR 0   /* dynamic major by default */#define SCULLP_DEVS 4    /* scullp0 through scullp3 *//* * The bare device is a variable-length region of memory. * Use a linked list of indirect blocks. * * "scullp_dev->data" points to an array of pointers, each * pointer refers to a memory page. * * The array (quantum-set) is SCULLP_QSET long. */#define SCULLP_ORDER    0 /* one page at a time */#define SCULLP_QSET     500struct scullp_dev {	void **data;	struct scullp_dev *next;  /* next listitem */	int vmas;                 /* active mappings */	int order;                /* the current allocation order */	int qset;                 /* the current array size */	size_t size;              /* 32-bit will suffice */	struct semaphore sem;     /* Mutual exclusion */	struct cdev cdev;};extern struct scullp_dev *scullp_devices;extern struct file_operations scullp_fops;/* * The different configurable parameters */extern int scullp_major;     /* main.c */extern int scullp_devs;extern int scullp_order;extern int scullp_qset;/* * Prototypes for shared functions */int scullp_trim(struct scullp_dev *dev);struct scullp_dev *scullp_follow(struct scullp_dev *dev, int n);#ifdef SCULLP_DEBUG#  define SCULLP_USE_PROC#endif/* * Ioctl definitions *//* Use 'K' as magic number */#define SCULLP_IOC_MAGIC  'K'#define SCULLP_IOCRESET    _IO(SCULLP_IOC_MAGIC, 0)/* * S means "Set" through a ptr, * T means "Tell" directly * G means "Get" (to a pointed var) * Q means "Query", response is on the return value * X means "eXchange": G and S atomically * H means "sHift": T and Q atomically */#define SCULLP_IOCSORDER   _IOW(SCULLP_IOC_MAGIC,  1, int)#define SCULLP_IOCTORDER   _IO(SCULLP_IOC_MAGIC,   2)#define SCULLP_IOCGORDER   _IOR(SCULLP_IOC_MAGIC,  3, int)#define SCULLP_IOCQORDER   _IO(SCULLP_IOC_MAGIC,   4)#define SCULLP_IOCXORDER   _IOWR(SCULLP_IOC_MAGIC, 5, int)#define SCULLP_IOCHORDER   _IO(SCULLP_IOC_MAGIC,   6)#define SCULLP_IOCSQSET    _IOW(SCULLP_IOC_MAGIC,  7, int)#define SCULLP_IOCTQSET    _IO(SCULLP_IOC_MAGIC,   8)#define SCULLP_IOCGQSET    _IOR(SCULLP_IOC_MAGIC,  9, int)#define SCULLP_IOCQQSET    _IO(SCULLP_IOC_MAGIC,  10)#define SCULLP_IOCXQSET    _IOWR(SCULLP_IOC_MAGIC,11, int)#define SCULLP_IOCHQSET    _IO(SCULLP_IOC_MAGIC,  12)#define SCULLP_IOC_MAXNR 12