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84 lines
2.6 KiB
84 lines
2.6 KiB
/****************************************************************************** |
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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 <[email protected]> |
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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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#include <linux/types.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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__u16 domid; |
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/* Flags for this mapping */ |
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__u16 flags; |
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/* Number of pages to map */ |
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__u32 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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__u64 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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__u32 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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__u64 index; |
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/* Number of references to unmap */ |
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__u32 count; |
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}; |
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/* |
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* Sets up an unmap notification within the page, so that the other side can do |
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* cleanup if this side crashes. Required to implement cross-domain robust |
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* mutexes or close notification on communication channels. |
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* |
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* Each mapped page only supports one notification; multiple calls referring to |
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* the same page overwrite the previous notification. You must clear the |
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* notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it |
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* to occur. |
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*/ |
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#define IOCTL_GNTALLOC_SET_UNMAP_NOTIFY \ |
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_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntalloc_unmap_notify)) |
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struct ioctl_gntalloc_unmap_notify { |
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/* IN parameters */ |
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/* Offset in the file descriptor for a byte within the page (same as |
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* used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to |
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* be cleared. Otherwise, it can be any byte in the page whose |
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* notification we are adjusting. |
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*/ |
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__u64 index; |
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/* Action(s) to take on unmap */ |
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__u32 action; |
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/* Event channel to notify */ |
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__u32 event_channel_port; |
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}; |
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/* Clear (set to zero) the byte specified by index */ |
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#define UNMAP_NOTIFY_CLEAR_BYTE 0x1 |
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/* Send an interrupt on the indicated event channel */ |
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#define UNMAP_NOTIFY_SEND_EVENT 0x2 |
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#endif /* __LINUX_PUBLIC_GNTALLOC_H__ */
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