x86: sanitize pathes arch/x86/kernel/cpu/Makefile
[linux-3.10.git] / include / asm-i386 / percpu.h
1 #ifndef __ARCH_I386_PERCPU__
2 #define __ARCH_I386_PERCPU__
3
4 #ifdef __ASSEMBLY__
5
6 /*
7  * PER_CPU finds an address of a per-cpu variable.
8  *
9  * Args:
10  *    var - variable name
11  *    reg - 32bit register
12  *
13  * The resulting address is stored in the "reg" argument.
14  *
15  * Example:
16  *    PER_CPU(cpu_gdt_descr, %ebx)
17  */
18 #ifdef CONFIG_SMP
19 #define PER_CPU(var, reg)                               \
20         movl %fs:per_cpu__##this_cpu_off, reg;          \
21         lea per_cpu__##var(reg), reg
22 #define PER_CPU_VAR(var)        %fs:per_cpu__##var
23 #else /* ! SMP */
24 #define PER_CPU(var, reg)                       \
25         movl $per_cpu__##var, reg
26 #define PER_CPU_VAR(var)        per_cpu__##var
27 #endif  /* SMP */
28
29 #else /* ...!ASSEMBLY */
30
31 /*
32  * PER_CPU finds an address of a per-cpu variable.
33  *
34  * Args:
35  *    var - variable name
36  *    cpu - 32bit register containing the current CPU number
37  *
38  * The resulting address is stored in the "cpu" argument.
39  *
40  * Example:
41  *    PER_CPU(cpu_gdt_descr, %ebx)
42  */
43 #ifdef CONFIG_SMP
44 /* Same as generic implementation except for optimized local access. */
45 #define __GENERIC_PER_CPU
46
47 /* This is used for other cpus to find our section. */
48 extern unsigned long __per_cpu_offset[];
49
50 #define per_cpu_offset(x) (__per_cpu_offset[x])
51
52 /* Separate out the type, so (int[3], foo) works. */
53 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
54 #define DEFINE_PER_CPU(type, name) \
55     __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
56
57 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)               \
58     __attribute__((__section__(".data.percpu.shared_aligned"))) \
59     __typeof__(type) per_cpu__##name                            \
60     ____cacheline_aligned_in_smp
61
62 /* We can use this directly for local CPU (faster). */
63 DECLARE_PER_CPU(unsigned long, this_cpu_off);
64
65 /* var is in discarded region: offset to particular copy we want */
66 #define per_cpu(var, cpu) (*({                          \
67         extern int simple_indentifier_##var(void);      \
68         RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
69
70 #define __raw_get_cpu_var(var) (*({                                     \
71         extern int simple_indentifier_##var(void);                      \
72         RELOC_HIDE(&per_cpu__##var, x86_read_percpu(this_cpu_off));     \
73 }))
74
75 #define __get_cpu_var(var) __raw_get_cpu_var(var)
76
77 /* A macro to avoid #include hell... */
78 #define percpu_modcopy(pcpudst, src, size)                      \
79 do {                                                            \
80         unsigned int __i;                                       \
81         for_each_possible_cpu(__i)                              \
82                 memcpy((pcpudst)+__per_cpu_offset[__i],         \
83                        (src), (size));                          \
84 } while (0)
85
86 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
87 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
88
89 /* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
90 #define __percpu_seg "%%fs:"
91 #else  /* !SMP */
92 #include <asm-generic/percpu.h>
93 #define __percpu_seg ""
94 #endif  /* SMP */
95
96 /* For arch-specific code, we can use direct single-insn ops (they
97  * don't give an lvalue though). */
98 extern void __bad_percpu_size(void);
99
100 #define percpu_to_op(op,var,val)                                \
101         do {                                                    \
102                 typedef typeof(var) T__;                        \
103                 if (0) { T__ tmp__; tmp__ = (val); }            \
104                 switch (sizeof(var)) {                          \
105                 case 1:                                         \
106                         asm(op "b %1,"__percpu_seg"%0"          \
107                             : "+m" (var)                        \
108                             :"ri" ((T__)val));                  \
109                         break;                                  \
110                 case 2:                                         \
111                         asm(op "w %1,"__percpu_seg"%0"          \
112                             : "+m" (var)                        \
113                             :"ri" ((T__)val));                  \
114                         break;                                  \
115                 case 4:                                         \
116                         asm(op "l %1,"__percpu_seg"%0"          \
117                             : "+m" (var)                        \
118                             :"ri" ((T__)val));                  \
119                         break;                                  \
120                 default: __bad_percpu_size();                   \
121                 }                                               \
122         } while (0)
123
124 #define percpu_from_op(op,var)                                  \
125         ({                                                      \
126                 typeof(var) ret__;                              \
127                 switch (sizeof(var)) {                          \
128                 case 1:                                         \
129                         asm(op "b "__percpu_seg"%1,%0"          \
130                             : "=r" (ret__)                      \
131                             : "m" (var));                       \
132                         break;                                  \
133                 case 2:                                         \
134                         asm(op "w "__percpu_seg"%1,%0"          \
135                             : "=r" (ret__)                      \
136                             : "m" (var));                       \
137                         break;                                  \
138                 case 4:                                         \
139                         asm(op "l "__percpu_seg"%1,%0"          \
140                             : "=r" (ret__)                      \
141                             : "m" (var));                       \
142                         break;                                  \
143                 default: __bad_percpu_size();                   \
144                 }                                               \
145                 ret__; })
146
147 #define x86_read_percpu(var) percpu_from_op("mov", per_cpu__##var)
148 #define x86_write_percpu(var,val) percpu_to_op("mov", per_cpu__##var, val)
149 #define x86_add_percpu(var,val) percpu_to_op("add", per_cpu__##var, val)
150 #define x86_sub_percpu(var,val) percpu_to_op("sub", per_cpu__##var, val)
151 #define x86_or_percpu(var,val) percpu_to_op("or", per_cpu__##var, val)
152 #endif /* !__ASSEMBLY__ */
153
154 #endif /* __ARCH_I386_PERCPU__ */