From 11d437789d0f35fa2e2ebcb4a983b29587bdfdc5 Mon Sep 17 00:00:00 2001 From: Isaku Yamahata Date: Fri, 17 Oct 2008 11:17:53 +0900 Subject: ia64/xen: implement the arch specific part of xencomm. On ia64/xen, pointer argument for the hypercall is passed by pseudo physical address (guest physical address.) So it is necessary to convert virtual address into pseudo physical address right before issuing hypercall. The frame work is called xencomm. This patch implements arch specific part. Signed-off-by: Alex Williamson Signed-off-by: Isaku Yamahata Cc: Akio Takebe Signed-off-by: Tony Luck --- arch/ia64/include/asm/xen/xencomm.h | 41 +++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 arch/ia64/include/asm/xen/xencomm.h (limited to 'arch/ia64/include') diff --git a/arch/ia64/include/asm/xen/xencomm.h b/arch/ia64/include/asm/xen/xencomm.h new file mode 100644 index 00000000000..28732cd931c --- /dev/null +++ b/arch/ia64/include/asm/xen/xencomm.h @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2006 Hollis Blanchard , IBM Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that 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 + */ + +#ifndef _ASM_IA64_XEN_XENCOMM_H +#define _ASM_IA64_XEN_XENCOMM_H + +#include +#include + +/* Must be called before any hypercall. */ +extern void xencomm_initialize(void); + +/* Check if virtual contiguity means physical contiguity + * where the passed address is a pointer value in virtual address. + * On ia64, identity mapping area in region 7 or the piece of region 5 + * that is mapped by itr[IA64_TR_KERNEL]/dtr[IA64_TR_KERNEL] + */ +static inline int xencomm_is_phys_contiguous(unsigned long addr) +{ + return (PAGE_OFFSET <= addr && + addr < (PAGE_OFFSET + (1UL << IA64_MAX_PHYS_BITS))) || + (KERNEL_START <= addr && + addr < KERNEL_START + KERNEL_TR_PAGE_SIZE); +} + +#endif /* _ASM_IA64_XEN_XENCOMM_H */ -- cgit v1.2.3