/****************************************************************************** * current.h *  * Information structure that lives at the bottom of the per-cpu Xen stack. */#ifndef __X86_CURRENT_H__#define __X86_CURRENT_H__#include <xen/config.h>#include <xen/percpu.h>#include <public/xen.h>#include <asm/page.h>struct vcpu;struct cpu_info {    struct cpu_user_regs guest_cpu_user_regs;    unsigned int         processor_id;    struct vcpu         *current_vcpu;};static inline struct cpu_info *get_cpu_info(void){    struct cpu_info *cpu_info;    __asm__ ( "and %%"__OP"sp,%0; or %2,%0"              : "=r" (cpu_info)              : "0" (~(STACK_SIZE-1)), "i" (STACK_SIZE-sizeof(struct cpu_info))        );    return cpu_info;}#define get_current()         (get_cpu_info()->current_vcpu)#define set_current(vcpu)     (get_cpu_info()->current_vcpu = (vcpu))#define current               (get_current())#define get_processor_id()    (get_cpu_info()->processor_id)#define set_processor_id(id)  (get_cpu_info()->processor_id = (id))#define guest_cpu_user_regs() (&get_cpu_info()->guest_cpu_user_regs)/* * Get the bottom-of-stack, as stored in the per-CPU TSS. This actually points * into the middle of cpu_info.guest_cpu_user_regs, at the section that * precisely corresponds to a CPU trap frame. */#define get_stack_bottom()                      \    ((unsigned long)&get_cpu_info()->guest_cpu_user_regs.es)#define reset_stack_and_jump(__fn)              \    __asm__ __volatile__ (                      \        "mov %0,%%"__OP"sp; jmp "STR(__fn)      \        : : "r" (guest_cpu_user_regs()) : "memory" )#define schedule_tail(vcpu) (((vcpu)->arch.schedule_tail)(vcpu))/* * Which VCPU's state is currently running on each CPU? * This is not necesasrily the same as 'current' as a CPU may be * executing a lazy state switch. */DECLARE_PER_CPU(struct vcpu *, curr_vcpu);#endif /* __X86_CURRENT_H__ */