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1965aae3 PA |
1 | #ifndef _ASM_X86_PERCPU_H |
2 | #define _ASM_X86_PERCPU_H | |
3334052a | 3 | |
1a51e3a0 | 4 | #ifdef CONFIG_X86_64 |
9939ddaf TH |
5 | #define __percpu_seg gs |
6 | #define __percpu_mov_op movq | |
1a51e3a0 | 7 | #else |
9939ddaf TH |
8 | #define __percpu_seg fs |
9 | #define __percpu_mov_op movl | |
96a388de | 10 | #endif |
3334052a | 11 | |
12 | #ifdef __ASSEMBLY__ | |
13 | ||
14 | /* | |
15 | * PER_CPU finds an address of a per-cpu variable. | |
16 | * | |
17 | * Args: | |
18 | * var - variable name | |
19 | * reg - 32bit register | |
20 | * | |
21 | * The resulting address is stored in the "reg" argument. | |
22 | * | |
23 | * Example: | |
24 | * PER_CPU(cpu_gdt_descr, %ebx) | |
25 | */ | |
26 | #ifdef CONFIG_SMP | |
9939ddaf TH |
27 | #define PER_CPU(var, reg) \ |
28 | __percpu_mov_op %__percpu_seg:per_cpu__this_cpu_off, reg; \ | |
3334052a | 29 | lea per_cpu__##var(reg), reg |
9939ddaf | 30 | #define PER_CPU_VAR(var) %__percpu_seg:per_cpu__##var |
3334052a | 31 | #else /* ! SMP */ |
9939ddaf TH |
32 | #define PER_CPU(var, reg) \ |
33 | __percpu_mov_op $per_cpu__##var, reg | |
3334052a | 34 | #define PER_CPU_VAR(var) per_cpu__##var |
35 | #endif /* SMP */ | |
36 | ||
37 | #else /* ...!ASSEMBLY */ | |
38 | ||
9939ddaf | 39 | #include <linux/stringify.h> |
3334052a | 40 | |
9939ddaf | 41 | #ifdef CONFIG_SMP |
87b26406 | 42 | #define __percpu_arg(x) "%%"__stringify(__percpu_seg)":%P" #x |
6dbde353 | 43 | #define __my_cpu_offset percpu_read(this_cpu_off) |
9939ddaf | 44 | #else |
87b26406 | 45 | #define __percpu_arg(x) "%" #x |
9939ddaf | 46 | #endif |
3334052a | 47 | |
3334052a | 48 | /* For arch-specific code, we can use direct single-insn ops (they |
49 | * don't give an lvalue though). */ | |
50 | extern void __bad_percpu_size(void); | |
51 | ||
bc9e3be2 JP |
52 | #define percpu_to_op(op, var, val) \ |
53 | do { \ | |
54 | typedef typeof(var) T__; \ | |
55 | if (0) { \ | |
56 | T__ tmp__; \ | |
57 | tmp__ = (val); \ | |
58 | } \ | |
59 | switch (sizeof(var)) { \ | |
60 | case 1: \ | |
87b26406 | 61 | asm(op "b %1,"__percpu_arg(0) \ |
bc9e3be2 JP |
62 | : "+m" (var) \ |
63 | : "ri" ((T__)val)); \ | |
64 | break; \ | |
65 | case 2: \ | |
87b26406 | 66 | asm(op "w %1,"__percpu_arg(0) \ |
bc9e3be2 JP |
67 | : "+m" (var) \ |
68 | : "ri" ((T__)val)); \ | |
69 | break; \ | |
70 | case 4: \ | |
87b26406 | 71 | asm(op "l %1,"__percpu_arg(0) \ |
bc9e3be2 JP |
72 | : "+m" (var) \ |
73 | : "ri" ((T__)val)); \ | |
74 | break; \ | |
9939ddaf | 75 | case 8: \ |
87b26406 | 76 | asm(op "q %1,"__percpu_arg(0) \ |
9939ddaf | 77 | : "+m" (var) \ |
299e2699 | 78 | : "re" ((T__)val)); \ |
9939ddaf | 79 | break; \ |
bc9e3be2 JP |
80 | default: __bad_percpu_size(); \ |
81 | } \ | |
82 | } while (0) | |
83 | ||
84 | #define percpu_from_op(op, var) \ | |
85 | ({ \ | |
86 | typeof(var) ret__; \ | |
87 | switch (sizeof(var)) { \ | |
88 | case 1: \ | |
87b26406 | 89 | asm(op "b "__percpu_arg(1)",%0" \ |
bc9e3be2 JP |
90 | : "=r" (ret__) \ |
91 | : "m" (var)); \ | |
92 | break; \ | |
93 | case 2: \ | |
87b26406 | 94 | asm(op "w "__percpu_arg(1)",%0" \ |
bc9e3be2 JP |
95 | : "=r" (ret__) \ |
96 | : "m" (var)); \ | |
97 | break; \ | |
98 | case 4: \ | |
87b26406 | 99 | asm(op "l "__percpu_arg(1)",%0" \ |
9939ddaf TH |
100 | : "=r" (ret__) \ |
101 | : "m" (var)); \ | |
102 | break; \ | |
103 | case 8: \ | |
87b26406 | 104 | asm(op "q "__percpu_arg(1)",%0" \ |
bc9e3be2 JP |
105 | : "=r" (ret__) \ |
106 | : "m" (var)); \ | |
107 | break; \ | |
108 | default: __bad_percpu_size(); \ | |
109 | } \ | |
110 | ret__; \ | |
111 | }) | |
3334052a | 112 | |
6dbde353 IM |
113 | #define percpu_read(var) percpu_from_op("mov", per_cpu__##var) |
114 | #define percpu_write(var, val) percpu_to_op("mov", per_cpu__##var, val) | |
115 | #define percpu_add(var, val) percpu_to_op("add", per_cpu__##var, val) | |
116 | #define percpu_sub(var, val) percpu_to_op("sub", per_cpu__##var, val) | |
117 | #define percpu_and(var, val) percpu_to_op("and", per_cpu__##var, val) | |
118 | #define percpu_or(var, val) percpu_to_op("or", per_cpu__##var, val) | |
119 | #define percpu_xor(var, val) percpu_to_op("xor", per_cpu__##var, val) | |
9939ddaf | 120 | |
49357d19 TH |
121 | /* This is not atomic against other CPUs -- CPU preemption needs to be off */ |
122 | #define x86_test_and_clear_bit_percpu(bit, var) \ | |
123 | ({ \ | |
124 | int old__; \ | |
87b26406 BG |
125 | asm volatile("btr %2,"__percpu_arg(1)"\n\tsbbl %0,%0" \ |
126 | : "=r" (old__), "+m" (per_cpu__##var) \ | |
127 | : "dIr" (bit)); \ | |
49357d19 TH |
128 | old__; \ |
129 | }) | |
130 | ||
6dbde353 IM |
131 | #include <asm-generic/percpu.h> |
132 | ||
133 | /* We can use this directly for local CPU (faster). */ | |
134 | DECLARE_PER_CPU(unsigned long, this_cpu_off); | |
135 | ||
3334052a | 136 | #endif /* !__ASSEMBLY__ */ |
23ca4bba MT |
137 | |
138 | #ifdef CONFIG_SMP | |
139 | ||
140 | /* | |
141 | * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu | |
142 | * variables that are initialized and accessed before there are per_cpu | |
143 | * areas allocated. | |
144 | */ | |
145 | ||
146 | #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ | |
147 | DEFINE_PER_CPU(_type, _name) = _initvalue; \ | |
148 | __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ | |
149 | { [0 ... NR_CPUS-1] = _initvalue }; \ | |
c6a92a25 | 150 | __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map |
23ca4bba MT |
151 | |
152 | #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ | |
153 | EXPORT_PER_CPU_SYMBOL(_name) | |
154 | ||
155 | #define DECLARE_EARLY_PER_CPU(_type, _name) \ | |
156 | DECLARE_PER_CPU(_type, _name); \ | |
157 | extern __typeof__(_type) *_name##_early_ptr; \ | |
158 | extern __typeof__(_type) _name##_early_map[] | |
159 | ||
160 | #define early_per_cpu_ptr(_name) (_name##_early_ptr) | |
161 | #define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx]) | |
162 | #define early_per_cpu(_name, _cpu) \ | |
f10fcd47 TH |
163 | *(early_per_cpu_ptr(_name) ? \ |
164 | &early_per_cpu_ptr(_name)[_cpu] : \ | |
165 | &per_cpu(_name, _cpu)) | |
23ca4bba MT |
166 | |
167 | #else /* !CONFIG_SMP */ | |
168 | #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ | |
169 | DEFINE_PER_CPU(_type, _name) = _initvalue | |
170 | ||
171 | #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ | |
172 | EXPORT_PER_CPU_SYMBOL(_name) | |
173 | ||
174 | #define DECLARE_EARLY_PER_CPU(_type, _name) \ | |
175 | DECLARE_PER_CPU(_type, _name) | |
176 | ||
177 | #define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu) | |
178 | #define early_per_cpu_ptr(_name) NULL | |
179 | /* no early_per_cpu_map() */ | |
180 | ||
181 | #endif /* !CONFIG_SMP */ | |
182 | ||
1965aae3 | 183 | #endif /* _ASM_X86_PERCPU_H */ |