/* * scullp.h -- definitions for the page-oriented char module * *********/#include <linux/ioctl.h>/* version dependencies have been confined to a separate file */#include "sysdep.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     500typedef struct 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 */} ScullP_Dev;extern 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(ScullP_Dev *dev);ScullP_Dev *scullp_follow(ScullP_Dev *dev, int n);#ifdef SCULLP_DEBUG#  if LINUX_VERSION_CODE > VERSION_CODE(1,99,3) /* 1.99.4 exported the needed symbols */#    define SCULLP_USE_PROC#  endif#endif#ifndef min#  define min(a,b) ((a)<(b) ? (a) : (b))#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, scullp_order)#define SCULLP_IOCSQSET    _IOW(SCULLP_IOC_MAGIC,  2, scullp_qset)#define SCULLP_IOCTORDER   _IO(SCULLP_IOC_MAGIC,   3)#define SCULLP_IOCTQSET    _IO(SCULLP_IOC_MAGIC,   4)#define SCULLP_IOCGORDER   _IOR(SCULLP_IOC_MAGIC,  5, scullp_order)#define SCULLP_IOCGQSET    _IOR(SCULLP_IOC_MAGIC,  6, scullp_qset)#define SCULLP_IOCQORDER   _IO(SCULLP_IOC_MAGIC,   7)#define SCULLP_IOCQQSET    _IO(SCULLP_IOC_MAGIC,   8)#define SCULLP_IOCXORDER   _IOWR(SCULLP_IOC_MAGIC, 9, scullp_order)#define SCULLP_IOCXQSET    _IOWR(SCULLP_IOC_MAGIC,10, scullp_qset)#define SCULLP_IOCHORDER   _IO(SCULLP_IOC_MAGIC,  11)#define SCULLP_IOCHQSET    _IO(SCULLP_IOC_MAGIC,  12)#define SCULLP_IOCHARDRESET _IO(SCULLP_IOC_MAGIC, 13) /* debugging tool */#define SCULLP_IOC_MAXNR 13