[IA64] ia64/pv_ops/pv_cpu_ops: fix _IA64_REG_IP case.
[linux-2.6.git] / arch / ia64 / include / asm / paravirt_privop.h
1 /******************************************************************************
2  * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
3  *                    VA Linux Systems Japan K.K.
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18  *
19  */
20
21 #ifndef _ASM_IA64_PARAVIRT_PRIVOP_H
22 #define _ASM_IA64_PARAVIRT_PRIVOP_H
23
24 #ifdef CONFIG_PARAVIRT
25
26 #ifndef __ASSEMBLY__
27
28 #include <linux/types.h>
29 #include <asm/kregs.h> /* for IA64_PSR_I */
30
31 /******************************************************************************
32  * replacement of intrinsics operations.
33  */
34
35 struct pv_cpu_ops {
36         void (*fc)(unsigned long addr);
37         unsigned long (*thash)(unsigned long addr);
38         unsigned long (*get_cpuid)(int index);
39         unsigned long (*get_pmd)(int index);
40         unsigned long (*getreg)(int reg);
41         void (*setreg)(int reg, unsigned long val);
42         void (*ptcga)(unsigned long addr, unsigned long size);
43         unsigned long (*get_rr)(unsigned long index);
44         void (*set_rr)(unsigned long index, unsigned long val);
45         void (*set_rr0_to_rr4)(unsigned long val0, unsigned long val1,
46                                unsigned long val2, unsigned long val3,
47                                unsigned long val4);
48         void (*ssm_i)(void);
49         void (*rsm_i)(void);
50         unsigned long (*get_psr_i)(void);
51         void (*intrin_local_irq_restore)(unsigned long flags);
52 };
53
54 extern struct pv_cpu_ops pv_cpu_ops;
55
56 extern void ia64_native_setreg_func(int regnum, unsigned long val);
57 extern unsigned long ia64_native_getreg_func(int regnum);
58
59 /************************************************/
60 /* Instructions paravirtualized for performance */
61 /************************************************/
62
63 /* mask for ia64_native_ssm/rsm() must be constant.("i" constraing).
64  * static inline function doesn't satisfy it. */
65 #define paravirt_ssm(mask)                      \
66         do {                                    \
67                 if ((mask) == IA64_PSR_I)       \
68                         pv_cpu_ops.ssm_i();     \
69                 else                            \
70                         ia64_native_ssm(mask);  \
71         } while (0)
72
73 #define paravirt_rsm(mask)                      \
74         do {                                    \
75                 if ((mask) == IA64_PSR_I)       \
76                         pv_cpu_ops.rsm_i();     \
77                 else                            \
78                         ia64_native_rsm(mask);  \
79         } while (0)
80
81 /* returned ip value should be the one in the caller,
82  * not in __paravirt_getreg() */
83 #define paravirt_getreg(reg)                                    \
84         ({                                                      \
85                 unsigned long res;                              \
86                 BUILD_BUG_ON(!__builtin_constant_p(reg));       \
87                 if ((reg) == _IA64_REG_IP)                      \
88                         res = ia64_native_getreg(_IA64_REG_IP); \
89                 else                                            \
90                         res = pv_cpu_ops.getreg(reg);           \
91                 res;                                            \
92         })
93
94 /******************************************************************************
95  * replacement of hand written assembly codes.
96  */
97 struct pv_cpu_asm_switch {
98         unsigned long switch_to;
99         unsigned long leave_syscall;
100         unsigned long work_processed_syscall;
101         unsigned long leave_kernel;
102 };
103 void paravirt_cpu_asm_init(const struct pv_cpu_asm_switch *cpu_asm_switch);
104
105 #endif /* __ASSEMBLY__ */
106
107 #define IA64_PARAVIRT_ASM_FUNC(name)    paravirt_ ## name
108
109 #else
110
111 /* fallback for native case */
112 #define IA64_PARAVIRT_ASM_FUNC(name)    ia64_native_ ## name
113
114 #endif /* CONFIG_PARAVIRT */
115
116 /* these routines utilize privilege-sensitive or performance-sensitive
117  * privileged instructions so the code must be replaced with
118  * paravirtualized versions */
119 #define ia64_switch_to                  IA64_PARAVIRT_ASM_FUNC(switch_to)
120 #define ia64_leave_syscall              IA64_PARAVIRT_ASM_FUNC(leave_syscall)
121 #define ia64_work_processed_syscall     \
122         IA64_PARAVIRT_ASM_FUNC(work_processed_syscall)
123 #define ia64_leave_kernel               IA64_PARAVIRT_ASM_FUNC(leave_kernel)
124
125 #endif /* _ASM_IA64_PARAVIRT_PRIVOP_H */