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