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
122