1/******************************************************************************
  2 * linux/arch/ia64/xen/paravirtentry.S
  3 *
  4 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
  5 *                    VA Linux Systems Japan K.K.
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License as published by
  9 * the Free Software Foundation; either version 2 of the License, or
 10 * (at your option) any later version.
 11 *
 12 * This program is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15 * GNU General Public License for more details.
 16 *
 17 * You should have received a copy of the GNU General Public License
 18 * along with this program; if not, write to the Free Software
 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 20 *
 21 */
 22
 23#include <linux/init.h>
 24#include <asm/asmmacro.h>
 25#include <asm/asm-offsets.h>
 26#include <asm/paravirt_privop.h>
 27#include <asm/paravirt_patch.h>
 28#include "entry.h"
 29
 30#define DATA8(sym, init_value)			\
 31	.pushsection .data..read_mostly ;	\
 32	.align 8 ;				\
 33	.global sym ;				\
 34	sym: ;					\
 35	data8 init_value ;			\
 36	.popsection
 37
 38#define BRANCH(targ, reg, breg, type)					\
 39	PARAVIRT_PATCH_SITE_BR(PARAVIRT_PATCH_TYPE_BR_ ## type) ;	\
 40	;;								\
 41	movl reg=targ ;							\
 42	;;								\
 43	ld8 reg=[reg] ;							\
 44	;;								\
 45	mov breg=reg ;							\
 46	br.cond.sptk.many breg
 47
 48#define BRANCH_PROC(sym, reg, breg, type)				\
 49	DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ;		\
 50	GLOBAL_ENTRY(paravirt_ ## sym) ;				\
 51		BRANCH(paravirt_ ## sym ## _targ, reg, breg, type) ;	\
 52	END(paravirt_ ## sym)
 53
 54#define BRANCH_PROC_UNWINFO(sym, reg, breg, type)			\
 55	DATA8(paravirt_ ## sym ## _targ, ia64_native_ ## sym) ;		\
 56	GLOBAL_ENTRY(paravirt_ ## sym) ;				\
 57		PT_REGS_UNWIND_INFO(0) ;				\
 58		BRANCH(paravirt_ ## sym ## _targ, reg, breg, type) ;	\
 59	END(paravirt_ ## sym)
 60
 61
 62BRANCH_PROC(switch_to, r22, b7, SWITCH_TO)
 63BRANCH_PROC_UNWINFO(leave_syscall, r22, b7, LEAVE_SYSCALL)
 64BRANCH_PROC(work_processed_syscall, r2, b7, WORK_PROCESSED_SYSCALL)
 65BRANCH_PROC_UNWINFO(leave_kernel, r22, b7, LEAVE_KERNEL)
 66
 67
 68#ifdef CONFIG_MODULES
 69#define __INIT_OR_MODULE	.text
 70#define __INITDATA_OR_MODULE	.data
 71#else
 72#define __INIT_OR_MODULE	__INIT
 73#define __INITDATA_OR_MODULE	__INITDATA
 74#endif /* CONFIG_MODULES */
 75
 76	__INIT_OR_MODULE
 77	GLOBAL_ENTRY(paravirt_fc_i)
 78	fc.i r32
 79	br.ret.sptk.many rp
 80	END(paravirt_fc_i)
 81	__FINIT
 82
 83	__INIT_OR_MODULE
 84	.align 32
 85	GLOBAL_ENTRY(paravirt_nop_b_inst_bundle)
 86	{
 87		nop.b 0
 88		nop.b 0
 89		nop.b 0
 90	}
 91	END(paravirt_nop_b_inst_bundle)
 92	__FINIT
 93
 94	/* NOTE: nop.[mfi] has same format */
 95	__INIT_OR_MODULE
 96	GLOBAL_ENTRY(paravirt_nop_mfi_inst_bundle)
 97	{
 98		nop.m 0
 99		nop.f 0
100		nop.i 0
101	}
102	END(paravirt_nop_mfi_inst_bundle)
103	__FINIT
104
105	__INIT_OR_MODULE
106	GLOBAL_ENTRY(paravirt_nop_bundle)
107paravirt_nop_bundle_start:
108	{
109		nop 0
110		nop 0
111		nop 0
112	}
113paravirt_nop_bundle_end:
114	END(paravirt_nop_bundle)
115	__FINIT
116
117	__INITDATA_OR_MODULE
118	.align 8
119	.global paravirt_nop_bundle_size
120paravirt_nop_bundle_size:
121	data8	paravirt_nop_bundle_end - paravirt_nop_bundle_start