123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
|
/* -*- 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 500
|
||
|
|
|
||
|
|
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 */
|
||
|
|
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
|
||
|
|
|
||
|
|
|
||
|
|
|