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51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
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/******************************************************************************
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* gntalloc.h
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*
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* Interface to /dev/xen/gntalloc.
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*
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* Author: Daniel De Graaf <dgdegra@tycho.nsa.gov>
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*
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* This file is in the public domain.
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*/
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#ifndef __LINUX_PUBLIC_GNTALLOC_H__
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#define __LINUX_PUBLIC_GNTALLOC_H__
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/*
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* Allocates a new page and creates a new grant reference.
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*/
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#define IOCTL_GNTALLOC_ALLOC_GREF \
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_IOC(_IOC_NONE, 'G', 5, sizeof(struct ioctl_gntalloc_alloc_gref))
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struct ioctl_gntalloc_alloc_gref {
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/* IN parameters */
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/* The ID of the domain to be given access to the grants. */
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uint16_t domid;
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/* Flags for this mapping */
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uint16_t flags;
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/* Number of pages to map */
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uint32_t count;
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/* OUT parameters */
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/* The offset to be used on a subsequent call to mmap(). */
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uint64_t index;
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/* The grant references of the newly created grant, one per page */
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/* Variable size, depending on count */
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uint32_t gref_ids[1];
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};
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#define GNTALLOC_FLAG_WRITABLE 1
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/*
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* Deallocates the grant reference, allowing the associated page to be freed if
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* no other domains are using it.
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*/
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#define IOCTL_GNTALLOC_DEALLOC_GREF \
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_IOC(_IOC_NONE, 'G', 6, sizeof(struct ioctl_gntalloc_dealloc_gref))
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struct ioctl_gntalloc_dealloc_gref {
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/* IN parameters */
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/* The offset returned in the map operation */
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uint64_t index;
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/* Number of references to unmap */
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uint32_t count;
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};
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#endif /* __LINUX_PUBLIC_GNTALLOC_H__ */
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