[ECOS] a question

["wwm" <wmwang at davform dot com>]

 

Hi,

 

We are porting the eCos to the embedded microprocessor MPC823,as everyone know,the most improtant port is the HAL,but I can not find the syntax rules on how to write the assemble code in HAL. e.g. What do "I" mean in code:

 

        asm volatile ("mfspr %0, %1;" : "=r" (_v_) : "I" (_spr_));

 

 

The question is  where I can find the detailed documents about it.

Thank you in advance.