1 #ifndef _ASM_X86_PERCPU_H_
2 #define _ASM_X86_PERCPU_H_
5 #include <linux/compiler.h>
7 /* Same as asm-generic/percpu.h, except that we store the per cpu offset
8 in the PDA. Longer term the PDA and every per cpu variable
9 should be just put into a single section and referenced directly
15 #define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)
16 #define __my_cpu_offset read_pda(data_offset)
18 #define per_cpu_offset(x) (__per_cpu_offset(x))
21 #include <asm-generic/percpu.h>
23 DECLARE_PER_CPU(struct x8664_pda, pda);
25 #else /* CONFIG_X86_64 */
30 * PER_CPU finds an address of a per-cpu variable.
34 * reg - 32bit register
36 * The resulting address is stored in the "reg" argument.
39 * PER_CPU(cpu_gdt_descr, %ebx)
42 #define PER_CPU(var, reg) \
43 movl %fs:per_cpu__##this_cpu_off, reg; \
44 lea per_cpu__##var(reg), reg
45 #define PER_CPU_VAR(var) %fs:per_cpu__##var
47 #define PER_CPU(var, reg) \
48 movl $per_cpu__##var, reg
49 #define PER_CPU_VAR(var) per_cpu__##var
52 #else /* ...!ASSEMBLY */
55 * PER_CPU finds an address of a per-cpu variable.
59 * cpu - 32bit register containing the current CPU number
61 * The resulting address is stored in the "cpu" argument.
64 * PER_CPU(cpu_gdt_descr, %ebx)
68 #define __my_cpu_offset x86_read_percpu(this_cpu_off)
70 /* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
71 #define __percpu_seg "%%fs:"
75 #define __percpu_seg ""
79 #include <asm-generic/percpu.h>
81 /* We can use this directly for local CPU (faster). */
82 DECLARE_PER_CPU(unsigned long, this_cpu_off);
84 /* For arch-specific code, we can use direct single-insn ops (they
85 * don't give an lvalue though). */
86 extern void __bad_percpu_size(void);
88 #define percpu_to_op(op, var, val) \
90 typedef typeof(var) T__; \
95 switch (sizeof(var)) { \
97 asm(op "b %1,"__percpu_seg"%0" \
102 asm(op "w %1,"__percpu_seg"%0" \
104 : "ri" ((T__)val)); \
107 asm(op "l %1,"__percpu_seg"%0" \
109 : "ri" ((T__)val)); \
111 default: __bad_percpu_size(); \
115 #define percpu_from_op(op, var) \
118 switch (sizeof(var)) { \
120 asm(op "b "__percpu_seg"%1,%0" \
125 asm(op "w "__percpu_seg"%1,%0" \
130 asm(op "l "__percpu_seg"%1,%0" \
134 default: __bad_percpu_size(); \
139 #define x86_read_percpu(var) percpu_from_op("mov", per_cpu__##var)
140 #define x86_write_percpu(var, val) percpu_to_op("mov", per_cpu__##var, val)
141 #define x86_add_percpu(var, val) percpu_to_op("add", per_cpu__##var, val)
142 #define x86_sub_percpu(var, val) percpu_to_op("sub", per_cpu__##var, val)
143 #define x86_or_percpu(var, val) percpu_to_op("or", per_cpu__##var, val)
144 #endif /* !__ASSEMBLY__ */
145 #endif /* !CONFIG_X86_64 */
150 * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu
151 * variables that are initialized and accessed before there are per_cpu
155 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
156 DEFINE_PER_CPU(_type, _name) = _initvalue; \
157 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \
158 { [0 ... NR_CPUS-1] = _initvalue }; \
159 __typeof__(_type) *_name##_early_ptr = _name##_early_map
161 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
162 EXPORT_PER_CPU_SYMBOL(_name)
164 #define DECLARE_EARLY_PER_CPU(_type, _name) \
165 DECLARE_PER_CPU(_type, _name); \
166 extern __typeof__(_type) *_name##_early_ptr; \
167 extern __typeof__(_type) _name##_early_map[]
169 #define early_per_cpu_ptr(_name) (_name##_early_ptr)
170 #define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
171 #define early_per_cpu(_name, _cpu) \
172 (early_per_cpu_ptr(_name) ? \
173 early_per_cpu_ptr(_name)[_cpu] : \
174 per_cpu(_name, _cpu))
176 #else /* !CONFIG_SMP */
177 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \
178 DEFINE_PER_CPU(_type, _name) = _initvalue
180 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
181 EXPORT_PER_CPU_SYMBOL(_name)
183 #define DECLARE_EARLY_PER_CPU(_type, _name) \
184 DECLARE_PER_CPU(_type, _name)
186 #define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu)
187 #define early_per_cpu_ptr(_name) NULL
188 /* no early_per_cpu_map() */
190 #endif /* !CONFIG_SMP */
192 #endif /* _ASM_X86_PERCPU_H_ */