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Diffstat (limited to 'include/asm-x86/percpu.h')
| -rw-r--r-- | include/asm-x86/percpu.h | 218 |
1 files changed, 0 insertions, 218 deletions
diff --git a/include/asm-x86/percpu.h b/include/asm-x86/percpu.h deleted file mode 100644 index e10a1d0678c..00000000000 --- a/include/asm-x86/percpu.h +++ /dev/null @@ -1,218 +0,0 @@ -#ifndef ASM_X86__PERCPU_H -#define ASM_X86__PERCPU_H - -#ifdef CONFIG_X86_64 -#include <linux/compiler.h> - -/* Same as asm-generic/percpu.h, except that we store the per cpu offset - in the PDA. Longer term the PDA and every per cpu variable - should be just put into a single section and referenced directly - from %gs */ - -#ifdef CONFIG_SMP -#include <asm/pda.h> - -#define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset) -#define __my_cpu_offset read_pda(data_offset) - -#define per_cpu_offset(x) (__per_cpu_offset(x)) - -#endif -#include <asm-generic/percpu.h> - -DECLARE_PER_CPU(struct x8664_pda, pda); - -/* - * These are supposed to be implemented as a single instruction which - * operates on the per-cpu data base segment. x86-64 doesn't have - * that yet, so this is a fairly inefficient workaround for the - * meantime. The single instruction is atomic with respect to - * preemption and interrupts, so we need to explicitly disable - * interrupts here to achieve the same effect. However, because it - * can be used from within interrupt-disable/enable, we can't actually - * disable interrupts; disabling preemption is enough. - */ -#define x86_read_percpu(var) \ - ({ \ - typeof(per_cpu_var(var)) __tmp; \ - preempt_disable(); \ - __tmp = __get_cpu_var(var); \ - preempt_enable(); \ - __tmp; \ - }) - -#define x86_write_percpu(var, val) \ - do { \ - preempt_disable(); \ - __get_cpu_var(var) = (val); \ - preempt_enable(); \ - } while(0) - -#else /* CONFIG_X86_64 */ - -#ifdef __ASSEMBLY__ - -/* - * PER_CPU finds an address of a per-cpu variable. - * - * Args: - * var - variable name - * reg - 32bit register - * - * The resulting address is stored in the "reg" argument. - * - * Example: - * PER_CPU(cpu_gdt_descr, %ebx) - */ -#ifdef CONFIG_SMP -#define PER_CPU(var, reg) \ - movl %fs:per_cpu__##this_cpu_off, reg; \ - lea per_cpu__##var(reg), reg -#define PER_CPU_VAR(var) %fs:per_cpu__##var -#else /* ! SMP */ -#define PER_CPU(var, reg) \ - movl $per_cpu__##var, reg -#define PER_CPU_VAR(var) per_cpu__##var -#endif /* SMP */ - -#else /* ...!ASSEMBLY */ - -/* - * PER_CPU finds an address of a per-cpu variable. - * - * Args: - * var - variable name - * cpu - 32bit register containing the current CPU number - * - * The resulting address is stored in the "cpu" argument. - * - * Example: - * PER_CPU(cpu_gdt_descr, %ebx) - */ -#ifdef CONFIG_SMP - -#define __my_cpu_offset x86_read_percpu(this_cpu_off) - -/* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */ -#define __percpu_seg "%%fs:" - -#else /* !SMP */ - -#define __percpu_seg "" - -#endif /* SMP */ - -#include <asm-generic/percpu.h> - -/* We can use this directly for local CPU (faster). */ -DECLARE_PER_CPU(unsigned long, this_cpu_off); - -/* For arch-specific code, we can use direct single-insn ops (they - * don't give an lvalue though). */ -extern void __bad_percpu_size(void); - -#define percpu_to_op(op, var, val) \ -do { \ - typedef typeof(var) T__; \ - if (0) { \ - T__ tmp__; \ - tmp__ = (val); \ - } \ - switch (sizeof(var)) { \ - case 1: \ - asm(op "b %1,"__percpu_seg"%0" \ - : "+m" (var) \ - : "ri" ((T__)val)); \ - break; \ - case 2: \ - asm(op "w %1,"__percpu_seg"%0" \ - : "+m" (var) \ - : "ri" ((T__)val)); \ - break; \ - case 4: \ - asm(op "l %1,"__percpu_seg"%0" \ - : "+m" (var) \ - : "ri" ((T__)val)); \ - break; \ - default: __bad_percpu_size(); \ - } \ -} while (0) - -#define percpu_from_op(op, var) \ -({ \ - typeof(var) ret__; \ - switch (sizeof(var)) { \ - case 1: \ - asm(op "b "__percpu_seg"%1,%0" \ - : "=r" (ret__) \ - : "m" (var)); \ - break; \ - case 2: \ - asm(op "w "__percpu_seg"%1,%0" \ - : "=r" (ret__) \ - : "m" (var)); \ - break; \ - case 4: \ - asm(op "l "__percpu_seg"%1,%0" \ - : "=r" (ret__) \ - : "m" (var)); \ - break; \ - default: __bad_percpu_size(); \ - } \ - ret__; \ -}) - -#define x86_read_percpu(var) percpu_from_op("mov", per_cpu__##var) -#define x86_write_percpu(var, val) percpu_to_op("mov", per_cpu__##var, val) -#define x86_add_percpu(var, val) percpu_to_op("add", per_cpu__##var, val) -#define x86_sub_percpu(var, val) percpu_to_op("sub", per_cpu__##var, val) -#define x86_or_percpu(var, val) percpu_to_op("or", per_cpu__##var, val) -#endif /* !__ASSEMBLY__ */ -#endif /* !CONFIG_X86_64 */ - -#ifdef CONFIG_SMP - -/* - * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu - * variables that are initialized and accessed before there are per_cpu - * areas allocated. - */ - -#define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ - DEFINE_PER_CPU(_type, _name) = _initvalue; \ - __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ - { [0 ... NR_CPUS-1] = _initvalue }; \ - __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map - -#define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ - EXPORT_PER_CPU_SYMBOL(_name) - -#define DECLARE_EARLY_PER_CPU(_type, _name) \ - DECLARE_PER_CPU(_type, _name); \ - extern __typeof__(_type) *_name##_early_ptr; \ - extern __typeof__(_type) _name##_early_map[] - -#define early_per_cpu_ptr(_name) (_name##_early_ptr) -#define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx]) -#define early_per_cpu(_name, _cpu) \ - (early_per_cpu_ptr(_name) ? \ - early_per_cpu_ptr(_name)[_cpu] : \ - per_cpu(_name, _cpu)) - -#else /* !CONFIG_SMP */ -#define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ - DEFINE_PER_CPU(_type, _name) = _initvalue - -#define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ - EXPORT_PER_CPU_SYMBOL(_name) - -#define DECLARE_EARLY_PER_CPU(_type, _name) \ - DECLARE_PER_CPU(_type, _name) - -#define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu) -#define early_per_cpu_ptr(_name) NULL -/* no early_per_cpu_map() */ - -#endif /* !CONFIG_SMP */ - -#endif /* ASM_X86__PERCPU_H */ |