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/*
* RAM-disk ioctl functions:
*/
#include <sys/ioccom.h>
struct rd_conf {
caddr_t rd_addr;
size_t rd_size;
int rd_type;
};
#define RD_GETCONF _IOR('r', 0, struct rd_conf) /* get unit config */
#define RD_SETCONF _IOW('r', 1, struct rd_conf) /* set unit config */
/*
* There are three configurations supported for each unit,
* reflected in the value of the rd_type field:
*/
#define RD_UNCONFIGURED 0
/*
* Not yet configured. Open returns ENXIO.
*/
#define RD_KMEM_FIXED 1
/*
* Disk image resident in kernel (patched in or loaded).
* Requires that the function: rd_set_kmem() is called to
* attach the (initialized) kernel memory to be used by the
* device. This can be called by an "open hook" if this
* driver is compiled with the RD_OPEN_HOOK option.
* No attempt will be made to free this memory.
*/
#define RD_KMEM_ALLOCATED 2
/*
* Small, wired-down chunk of kernel memory obtained from
* kmem_alloc(). The allocation is performed by an ioctl
* call on the "control" unit (regular unit + 16)
*/
#define RD_UMEM_SERVER 3
/*
* Indirect access to user-space of a user-level server.
* (Like the MFS hack, but better! 8^) Device operates
* only while the server has the control device open and
* continues to service I/O requests. The process that
* does this setconf will become the I/O server.
* Support for this configuration type is optional:
* option RAMDISK_SERVER
*/
#ifdef _KERNEL
/*
* If the option RAMDISK_HOOKS is on, then these functions are
* called by the ramdisk driver to allow machine-dependent to
* configure and/or load each ramdisk unit.
*/
extern void rd_attach_hook __P((int unit, struct rd_conf *));
extern void rd_open_hook __P((int unit, struct rd_conf *));
#endif
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