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md.h revision 1.1 
      1 
      2 /*
      3  * RAM-disk ioctl functions:
      4  */
      5 
      6 #include <sys/ioccom.h>
      7 
      8 struct rd_conf {
      9 	caddr_t rd_addr;
     10 	size_t  rd_size;
     11 	int     rd_type;
     12 };
     13 
     14 #define RD_GETCONF	_IOR('r', 0, struct rd_conf)	/* get unit config */
     15 #define RD_SETCONF	_IOW('r', 1, struct rd_conf)	/* set unit config */
     16 
     17 /*
     18  * There are three configurations supported for each unit,
     19  * reflected in the value of the rd_type field:
     20  */
     21 #define RD_UNCONFIGURED 0
     22 /*
     23  *     Not yet configured.  Open returns ENXIO.
     24  */
     25 #define RD_KMEM_FIXED	1
     26 /*
     27  *     Disk image resident in kernel (patched in or loaded).
     28  *     Requires that the function: rd_set_kmem() is called to
     29  *     attach the (initialized) kernel memory to be used by the
     30  *     device.  This can be called by an "open hook" if this
     31  *     driver is compiled with the RD_OPEN_HOOK option.
     32  *     No attempt will be made to free this memory.
     33  */
     34 #define RD_KMEM_ALLOCATED 2
     35 /*
     36  *     Small, wired-down chunk of kernel memory obtained from
     37  *     kmem_alloc().  The allocation is performed by an ioctl
     38  *     call on the "control" unit (regular unit + 16)
     39  */
     40 #define RD_UMEM_SERVER 3
     41 /*
     42  *     Indirect access to user-space of a user-level server.
     43  *     (Like the MFS hack, but better! 8^)  Device operates
     44  *     only while the server has the control device open and
     45  *     continues to service I/O requests.  The process that
     46  *     does this setconf will become the I/O server.
     47  *     Support for this configuration type is optional:
     48  *         option  RAMDISK_SERVER
     49  */
     50 
     51 #ifdef	_KERNEL
     52 /*
     53  * If the option RAMDISK_HOOKS is on, then these functions are
     54  * called by the ramdisk driver to allow machine-dependent to
     55  * configure and/or load each ramdisk unit.
     56  */
     57 extern void rd_attach_hook __P((int unit, struct rd_conf *));
     58 extern void rd_open_hook   __P((int unit, struct rd_conf *));
     59 #endif
     60