155 lines
4.3 KiB
C
155 lines
4.3 KiB
C
#ifndef __ARCH_I386_PERCPU__
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#define __ARCH_I386_PERCPU__
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#ifdef __ASSEMBLY__
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/*
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* PER_CPU finds an address of a per-cpu variable.
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*
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* Args:
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* var - variable name
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* reg - 32bit register
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*
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* The resulting address is stored in the "reg" argument.
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*
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* Example:
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* PER_CPU(cpu_gdt_descr, %ebx)
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*/
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#ifdef CONFIG_SMP
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#define PER_CPU(var, reg) \
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movl %fs:per_cpu__##this_cpu_off, reg; \
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lea per_cpu__##var(reg), reg
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#define PER_CPU_VAR(var) %fs:per_cpu__##var
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#else /* ! SMP */
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#define PER_CPU(var, reg) \
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movl $per_cpu__##var, reg
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#define PER_CPU_VAR(var) per_cpu__##var
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#endif /* SMP */
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#else /* ...!ASSEMBLY */
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/*
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* PER_CPU finds an address of a per-cpu variable.
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*
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* Args:
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* var - variable name
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* cpu - 32bit register containing the current CPU number
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*
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* The resulting address is stored in the "cpu" argument.
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*
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* Example:
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* PER_CPU(cpu_gdt_descr, %ebx)
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*/
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#ifdef CONFIG_SMP
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/* Same as generic implementation except for optimized local access. */
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#define __GENERIC_PER_CPU
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/* This is used for other cpus to find our section. */
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extern unsigned long __per_cpu_offset[];
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#define per_cpu_offset(x) (__per_cpu_offset[x])
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/* Separate out the type, so (int[3], foo) works. */
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#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
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#define DEFINE_PER_CPU(type, name) \
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__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
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#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
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__attribute__((__section__(".data.percpu.shared_aligned"))) \
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__typeof__(type) per_cpu__##name \
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____cacheline_aligned_in_smp
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/* We can use this directly for local CPU (faster). */
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DECLARE_PER_CPU(unsigned long, this_cpu_off);
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/* var is in discarded region: offset to particular copy we want */
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#define per_cpu(var, cpu) (*({ \
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extern int simple_indentifier_##var(void); \
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RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
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#define __raw_get_cpu_var(var) (*({ \
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extern int simple_indentifier_##var(void); \
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RELOC_HIDE(&per_cpu__##var, x86_read_percpu(this_cpu_off)); \
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}))
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#define __get_cpu_var(var) __raw_get_cpu_var(var)
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/* A macro to avoid #include hell... */
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#define percpu_modcopy(pcpudst, src, size) \
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do { \
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unsigned int __i; \
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for_each_possible_cpu(__i) \
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memcpy((pcpudst)+__per_cpu_offset[__i], \
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(src), (size)); \
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} while (0)
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#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
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#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
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/* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
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#define __percpu_seg "%%fs:"
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#else /* !SMP */
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#include <asm-generic/percpu.h>
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#define __percpu_seg ""
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#endif /* SMP */
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/* For arch-specific code, we can use direct single-insn ops (they
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* don't give an lvalue though). */
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extern void __bad_percpu_size(void);
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#define percpu_to_op(op,var,val) \
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do { \
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typedef typeof(var) T__; \
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if (0) { T__ tmp__; tmp__ = (val); } \
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switch (sizeof(var)) { \
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case 1: \
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asm(op "b %1,"__percpu_seg"%0" \
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: "+m" (var) \
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:"ri" ((T__)val)); \
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break; \
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case 2: \
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asm(op "w %1,"__percpu_seg"%0" \
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: "+m" (var) \
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:"ri" ((T__)val)); \
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break; \
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case 4: \
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asm(op "l %1,"__percpu_seg"%0" \
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: "+m" (var) \
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:"ri" ((T__)val)); \
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break; \
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default: __bad_percpu_size(); \
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} \
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} while (0)
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#define percpu_from_op(op,var) \
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({ \
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typeof(var) ret__; \
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switch (sizeof(var)) { \
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case 1: \
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asm(op "b "__percpu_seg"%1,%0" \
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: "=r" (ret__) \
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: "m" (var)); \
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break; \
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case 2: \
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asm(op "w "__percpu_seg"%1,%0" \
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: "=r" (ret__) \
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: "m" (var)); \
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break; \
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case 4: \
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asm(op "l "__percpu_seg"%1,%0" \
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: "=r" (ret__) \
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: "m" (var)); \
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break; \
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default: __bad_percpu_size(); \
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} \
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ret__; })
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#define x86_read_percpu(var) percpu_from_op("mov", per_cpu__##var)
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#define x86_write_percpu(var,val) percpu_to_op("mov", per_cpu__##var, val)
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#define x86_add_percpu(var,val) percpu_to_op("add", per_cpu__##var, val)
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#define x86_sub_percpu(var,val) percpu_to_op("sub", per_cpu__##var, val)
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#define x86_or_percpu(var,val) percpu_to_op("or", per_cpu__##var, val)
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#endif /* !__ASSEMBLY__ */
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#endif /* __ARCH_I386_PERCPU__ */
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