Xen devel - Aug 2011 - movl VCPU_processor(%ebx),%eax in exits.S

In  the file \xen\arch\x86\hvm\svm\x86_32\exits.S
 this instruction  movl VCPU_processor(%ebx),%eax, I  found
OFFSET(VCPU_processor, struct vcpu, processor) in   asm-offsets.c,and so was
DEFINE(IRQSTAT_shift, LOG_2(sizeof(irq_cpustat_t)));
In my opinion,they means offset(vcpu,processor) and
LOG_2(sizeof(irq_cpustat_t) , am i right?

        movl VCPU_processor(%ebx),%eax
        shl  $IRQSTAT_shift,%eax
        testl $~0,irq_stat(%eax,1)
        jnz  svm_process_softirqs

I did''t find  irq_stat(,),and so I did''t know what do the
first three
instructions mean.


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On Wed, Aug 10, 2011 at 11:42:06PM +0800, 赵彬 wrote:
> In  the file \xen\arch\x86\hvm\svm\x86_32\exits.S
>  this instruction  movl VCPU_processor(%ebx),%eax, I  found
> OFFSET(VCPU_processor, struct vcpu, processor) in   asm-offsets.c,and so
was
> DEFINE(IRQSTAT_shift, LOG_2(sizeof(irq_cpustat_t)));
> In my opinion,they means offset(vcpu,processor) and
> LOG_2(sizeof(irq_cpustat_t) , am i right?
> 
>         movl VCPU_processor(%ebx),%eax
>         shl  $IRQSTAT_shift,%eax
>         testl $~0,irq_stat(%eax,1)
>         jnz  svm_process_softirqs
> 
> I did''t find  irq_stat(,),and so I did''t know what do the
first three
> instructions mean.
xen/common/softirq.c

A simple grep is enough for you.

Wei.

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