Commit | Line | Data |
---|---|---|
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 | ||
2add8e23 BG |
37 | #ifdef CONFIG_X86_64_SMP |
38 | #define INIT_PER_CPU_VAR(var) init_per_cpu__##var | |
39 | #else | |
40 | #define INIT_PER_CPU_VAR(var) per_cpu__##var | |
41 | #endif | |
42 | ||
3334052a | 43 | #else /* ...!ASSEMBLY */ |
44 | ||
e59a1bb2 | 45 | #include <linux/kernel.h> |
9939ddaf | 46 | #include <linux/stringify.h> |
3334052a | 47 | |
9939ddaf | 48 | #ifdef CONFIG_SMP |
87b26406 | 49 | #define __percpu_arg(x) "%%"__stringify(__percpu_seg)":%P" #x |
6dbde353 | 50 | #define __my_cpu_offset percpu_read(this_cpu_off) |
9939ddaf | 51 | #else |
ed8d9adf | 52 | #define __percpu_arg(x) "%P" #x |
9939ddaf | 53 | #endif |
3334052a | 54 | |
2add8e23 BG |
55 | /* |
56 | * Initialized pointers to per-cpu variables needed for the boot | |
57 | * processor need to use these macros to get the proper address | |
58 | * offset from __per_cpu_load on SMP. | |
59 | * | |
60 | * There also must be an entry in vmlinux_64.lds.S | |
61 | */ | |
62 | #define DECLARE_INIT_PER_CPU(var) \ | |
63 | extern typeof(per_cpu_var(var)) init_per_cpu_var(var) | |
64 | ||
65 | #ifdef CONFIG_X86_64_SMP | |
66 | #define init_per_cpu_var(var) init_per_cpu__##var | |
67 | #else | |
68 | #define init_per_cpu_var(var) per_cpu_var(var) | |
69 | #endif | |
70 | ||
3334052a | 71 | /* For arch-specific code, we can use direct single-insn ops (they |
72 | * don't give an lvalue though). */ | |
73 | extern void __bad_percpu_size(void); | |
74 | ||
bc9e3be2 JP |
75 | #define percpu_to_op(op, var, val) \ |
76 | do { \ | |
77 | typedef typeof(var) T__; \ | |
78 | if (0) { \ | |
79 | T__ tmp__; \ | |
80 | tmp__ = (val); \ | |
81 | } \ | |
82 | switch (sizeof(var)) { \ | |
83 | case 1: \ | |
87b26406 | 84 | asm(op "b %1,"__percpu_arg(0) \ |
bc9e3be2 | 85 | : "+m" (var) \ |
3c598766 | 86 | : "qi" ((T__)(val))); \ |
bc9e3be2 JP |
87 | break; \ |
88 | case 2: \ | |
87b26406 | 89 | asm(op "w %1,"__percpu_arg(0) \ |
bc9e3be2 | 90 | : "+m" (var) \ |
3c598766 | 91 | : "ri" ((T__)(val))); \ |
bc9e3be2 JP |
92 | break; \ |
93 | case 4: \ | |
87b26406 | 94 | asm(op "l %1,"__percpu_arg(0) \ |
bc9e3be2 | 95 | : "+m" (var) \ |
3c598766 | 96 | : "ri" ((T__)(val))); \ |
bc9e3be2 | 97 | break; \ |
9939ddaf | 98 | case 8: \ |
87b26406 | 99 | asm(op "q %1,"__percpu_arg(0) \ |
9939ddaf | 100 | : "+m" (var) \ |
3c598766 | 101 | : "re" ((T__)(val))); \ |
9939ddaf | 102 | break; \ |
bc9e3be2 JP |
103 | default: __bad_percpu_size(); \ |
104 | } \ | |
105 | } while (0) | |
106 | ||
ed8d9adf | 107 | #define percpu_from_op(op, var, constraint) \ |
bc9e3be2 JP |
108 | ({ \ |
109 | typeof(var) ret__; \ | |
110 | switch (sizeof(var)) { \ | |
111 | case 1: \ | |
87b26406 | 112 | asm(op "b "__percpu_arg(1)",%0" \ |
3c598766 | 113 | : "=q" (ret__) \ |
ed8d9adf | 114 | : constraint); \ |
bc9e3be2 JP |
115 | break; \ |
116 | case 2: \ | |
87b26406 | 117 | asm(op "w "__percpu_arg(1)",%0" \ |
bc9e3be2 | 118 | : "=r" (ret__) \ |
ed8d9adf | 119 | : constraint); \ |
bc9e3be2 JP |
120 | break; \ |
121 | case 4: \ | |
87b26406 | 122 | asm(op "l "__percpu_arg(1)",%0" \ |
9939ddaf | 123 | : "=r" (ret__) \ |
ed8d9adf | 124 | : constraint); \ |
9939ddaf TH |
125 | break; \ |
126 | case 8: \ | |
87b26406 | 127 | asm(op "q "__percpu_arg(1)",%0" \ |
bc9e3be2 | 128 | : "=r" (ret__) \ |
ed8d9adf | 129 | : constraint); \ |
bc9e3be2 JP |
130 | break; \ |
131 | default: __bad_percpu_size(); \ | |
132 | } \ | |
133 | ret__; \ | |
134 | }) | |
3334052a | 135 | |
ed8d9adf LT |
136 | /* |
137 | * percpu_read() makes gcc load the percpu variable every time it is | |
138 | * accessed while percpu_read_stable() allows the value to be cached. | |
139 | * percpu_read_stable() is more efficient and can be used if its value | |
140 | * is guaranteed to be valid across cpus. The current users include | |
141 | * get_current() and get_thread_info() both of which are actually | |
142 | * per-thread variables implemented as per-cpu variables and thus | |
143 | * stable for the duration of the respective task. | |
144 | */ | |
145 | #define percpu_read(var) percpu_from_op("mov", per_cpu__##var, \ | |
146 | "m" (per_cpu__##var)) | |
147 | #define percpu_read_stable(var) percpu_from_op("mov", per_cpu__##var, \ | |
148 | "p" (&per_cpu__##var)) | |
6dbde353 IM |
149 | #define percpu_write(var, val) percpu_to_op("mov", per_cpu__##var, val) |
150 | #define percpu_add(var, val) percpu_to_op("add", per_cpu__##var, val) | |
151 | #define percpu_sub(var, val) percpu_to_op("sub", per_cpu__##var, val) | |
152 | #define percpu_and(var, val) percpu_to_op("and", per_cpu__##var, val) | |
153 | #define percpu_or(var, val) percpu_to_op("or", per_cpu__##var, val) | |
154 | #define percpu_xor(var, val) percpu_to_op("xor", per_cpu__##var, val) | |
9939ddaf | 155 | |
49357d19 TH |
156 | /* This is not atomic against other CPUs -- CPU preemption needs to be off */ |
157 | #define x86_test_and_clear_bit_percpu(bit, var) \ | |
158 | ({ \ | |
159 | int old__; \ | |
87b26406 BG |
160 | asm volatile("btr %2,"__percpu_arg(1)"\n\tsbbl %0,%0" \ |
161 | : "=r" (old__), "+m" (per_cpu__##var) \ | |
162 | : "dIr" (bit)); \ | |
49357d19 TH |
163 | old__; \ |
164 | }) | |
165 | ||
6dbde353 IM |
166 | #include <asm-generic/percpu.h> |
167 | ||
168 | /* We can use this directly for local CPU (faster). */ | |
169 | DECLARE_PER_CPU(unsigned long, this_cpu_off); | |
170 | ||
3334052a | 171 | #endif /* !__ASSEMBLY__ */ |
23ca4bba MT |
172 | |
173 | #ifdef CONFIG_SMP | |
174 | ||
175 | /* | |
176 | * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu | |
177 | * variables that are initialized and accessed before there are per_cpu | |
178 | * areas allocated. | |
179 | */ | |
180 | ||
181 | #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ | |
182 | DEFINE_PER_CPU(_type, _name) = _initvalue; \ | |
183 | __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ | |
184 | { [0 ... NR_CPUS-1] = _initvalue }; \ | |
c6a92a25 | 185 | __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map |
23ca4bba MT |
186 | |
187 | #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ | |
188 | EXPORT_PER_CPU_SYMBOL(_name) | |
189 | ||
190 | #define DECLARE_EARLY_PER_CPU(_type, _name) \ | |
191 | DECLARE_PER_CPU(_type, _name); \ | |
192 | extern __typeof__(_type) *_name##_early_ptr; \ | |
193 | extern __typeof__(_type) _name##_early_map[] | |
194 | ||
195 | #define early_per_cpu_ptr(_name) (_name##_early_ptr) | |
196 | #define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx]) | |
197 | #define early_per_cpu(_name, _cpu) \ | |
f10fcd47 TH |
198 | *(early_per_cpu_ptr(_name) ? \ |
199 | &early_per_cpu_ptr(_name)[_cpu] : \ | |
200 | &per_cpu(_name, _cpu)) | |
23ca4bba MT |
201 | |
202 | #else /* !CONFIG_SMP */ | |
203 | #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ | |
204 | DEFINE_PER_CPU(_type, _name) = _initvalue | |
205 | ||
206 | #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ | |
207 | EXPORT_PER_CPU_SYMBOL(_name) | |
208 | ||
209 | #define DECLARE_EARLY_PER_CPU(_type, _name) \ | |
210 | DECLARE_PER_CPU(_type, _name) | |
211 | ||
212 | #define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu) | |
213 | #define early_per_cpu_ptr(_name) NULL | |
214 | /* no early_per_cpu_map() */ | |
215 | ||
216 | #endif /* !CONFIG_SMP */ | |
217 | ||
1965aae3 | 218 | #endif /* _ASM_X86_PERCPU_H */ |