/****************************************************************************** * gntalloc.h * * Interface to /dev/xen/gntalloc. * * Author: Daniel De Graaf <dgdegra@tycho.nsa.gov> * * This file is in the public domain. */ #ifndef __LINUX_PUBLIC_GNTALLOC_H__#define __LINUX_PUBLIC_GNTALLOC_H__ /* * Allocates a new page and creates a new grant reference. */#define IOCTL_GNTALLOC_ALLOC_GREF \_IOC(_IOC_NONE, 'G', 5, sizeof(struct ioctl_gntalloc_alloc_gref))struct ioctl_gntalloc_alloc_gref {	/* IN parameters */	/* The ID of the domain to be given access to the grants. */	uint16_t domid;	/* Flags for this mapping */	uint16_t flags;	/* Number of pages to map */	uint32_t count;	/* OUT parameters */	/* The offset to be used on a subsequent call to mmap(). */	uint64_t index;	/* The grant references of the newly created grant, one per page */	/* Variable size, depending on count */	uint32_t gref_ids[1];}; #define GNTALLOC_FLAG_WRITABLE 1 /* * Deallocates the grant reference, allowing the associated page to be freed if * no other domains are using it. */#define IOCTL_GNTALLOC_DEALLOC_GREF \_IOC(_IOC_NONE, 'G', 6, sizeof(struct ioctl_gntalloc_dealloc_gref))struct ioctl_gntalloc_dealloc_gref {	/* IN parameters */	/* The offset returned in the map operation */	uint64_t index;	/* Number of references to unmap */	uint32_t count;}; /* * Sets up an unmap notification within the page, so that the other side can do * cleanup if this side crashes. Required to implement cross-domain robust * mutexes or close notification on communication channels. * * Each mapped page only supports one notification; multiple calls referring to * the same page overwrite the previous notification. You must clear the * notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it * to occur. */#define IOCTL_GNTALLOC_SET_UNMAP_NOTIFY \_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntalloc_unmap_notify))struct ioctl_gntalloc_unmap_notify {	/* IN parameters */	/* Offset in the file descriptor for a byte within the page (same as	 * used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to	 * be cleared. Otherwise, it can be any byte in the page whose	 * notification we are adjusting.	 */	uint64_t index;	/* Action(s) to take on unmap */	uint32_t action;	/* Event channel to notify */	uint32_t event_channel_port;}; /* Clear (set to zero) the byte specified by index */#define UNMAP_NOTIFY_CLEAR_BYTE 0x1/* Send an interrupt on the indicated event channel */#define UNMAP_NOTIFY_SEND_EVENT 0x2 #endif /* __LINUX_PUBLIC_GNTALLOC_H__ */