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/*
*
* Copyright (c) 2011, Microsoft Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Authors:
* Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com>
* K. Y. Srinivasan <kys@microsoft.com>
*
*/
#ifndef _HYPERV_H
#define _HYPERV_H
struct hv_guid {
unsigned char data[16];
};
#define MAX_PAGE_BUFFER_COUNT 16
#define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */
#pragma pack(push, 1)
/* Single-page buffer */
struct hv_page_buffer {
u32 len;
u32 offset;
u64 pfn;
};
/* Multiple-page buffer */
struct hv_multipage_buffer {
/* Length and Offset determines the # of pfns in the array */
u32 len;
u32 offset;
u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
};
/* 0x18 includes the proprietary packet header */
#define MAX_PAGE_BUFFER_PACKET (0x18 + \
(sizeof(struct hv_page_buffer) * \
MAX_PAGE_BUFFER_COUNT))
#define MAX_MULTIPAGE_BUFFER_PACKET (0x18 + \
sizeof(struct hv_multipage_buffer))
#pragma pack(pop)
struct hv_ring_buffer {
/* Offset in bytes from the start of ring data below */
u32 write_index;
/* Offset in bytes from the start of ring data below */
u32 read_index;
u32 interrupt_mask;
/* Pad it to PAGE_SIZE so that data starts on page boundary */
u8 reserved[4084];
/* NOTE:
* The interrupt_mask field is used only for channels but since our
* vmbus connection also uses this data structure and its data starts
* here, we commented out this field.
*/
/*
* Ring data starts here + RingDataStartOffset
* !!! DO NOT place any fields below this !!!
*/
u8 buffer[0];
} __packed;
struct hv_ring_buffer_info {
struct hv_ring_buffer *ring_buffer;
u32 ring_size; /* Include the shared header */
spinlock_t ring_lock;
u32 ring_datasize; /* < ring_size */
u32 ring_data_startoffset;
};
struct hv_ring_buffer_debug_info {
u32 current_interrupt_mask;
u32 current_read_index;
u32 current_write_index;
u32 bytes_avail_toread;
u32 bytes_avail_towrite;
};
#endif /* _HYPERV_H */
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