mirror of https://gitee.com/openkylin/linux.git
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Copyright (C) IBM Corp. 2006
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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* Jerone Young <jyoung5@us.ibm.com>
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*/
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#ifndef _LINUX_XENCOMM_H_
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#define _LINUX_XENCOMM_H_
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#include <xen/interface/xencomm.h>
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#define XENCOMM_MINI_ADDRS 3
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struct xencomm_mini {
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struct xencomm_desc _desc;
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uint64_t address[XENCOMM_MINI_ADDRS];
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};
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/* To avoid additionnal virt to phys conversion, an opaque structure is
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presented. */
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struct xencomm_handle;
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extern void xencomm_free(struct xencomm_handle *desc);
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extern struct xencomm_handle *xencomm_map(void *ptr, unsigned long bytes);
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extern struct xencomm_handle *__xencomm_map_no_alloc(void *ptr,
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unsigned long bytes, struct xencomm_mini *xc_area);
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#if 0
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#define XENCOMM_MINI_ALIGNED(xc_desc, n) \
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struct xencomm_mini xc_desc ## _base[(n)] \
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__attribute__((__aligned__(sizeof(struct xencomm_mini)))); \
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struct xencomm_mini *xc_desc = &xc_desc ## _base[0];
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#else
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/*
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* gcc bug workaround:
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* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16660
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* gcc doesn't handle properly stack variable with
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* __attribute__((__align__(sizeof(struct xencomm_mini))))
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*/
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#define XENCOMM_MINI_ALIGNED(xc_desc, n) \
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unsigned char xc_desc ## _base[((n) + 1 ) * \
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sizeof(struct xencomm_mini)]; \
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struct xencomm_mini *xc_desc = (struct xencomm_mini *) \
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((unsigned long)xc_desc ## _base + \
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(sizeof(struct xencomm_mini) - \
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((unsigned long)xc_desc ## _base) % \
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sizeof(struct xencomm_mini)));
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#endif
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#define xencomm_map_no_alloc(ptr, bytes) \
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({ XENCOMM_MINI_ALIGNED(xc_desc, 1); \
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__xencomm_map_no_alloc(ptr, bytes, xc_desc); })
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/* provided by architecture code: */
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extern unsigned long xencomm_vtop(unsigned long vaddr);
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static inline void *xencomm_pa(void *ptr)
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{
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return (void *)xencomm_vtop((unsigned long)ptr);
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}
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#define xen_guest_handle(hnd) ((hnd).p)
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#endif /* _LINUX_XENCOMM_H_ */
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