[U-Boot-Users] what means this symbol "@"?

[seaman]

Thank you!Now I understand it.
lis r1,value =addis r1,0,value

----- Original Message -----
From: "Udi Finkelstein" <udif at bigfoot.com>
To: "seaman" <okisoftxman at hotmail.com>
Sent: Thursday, May 08, 2003 4:42 PM
Subject: Re: [U-Boot-Users] what means this symbol "@"?


> My guess is that "@h" means a 16-bit constant made of the upper 16-bot
> of CFG_IMMR.
>
> It took me a lot of time to find what "lis" is. I couldn't find it in
> either the IBM arch. manual I had, or the MPC823 manual.
> Only after I looked at the obcode, I found that this is actually
> something like a private case of the add immediate instruction or
> something like that, where the 1st argument is a constant 0.
> This means that lis loads a register by taking a 16-bit constant and
> putting it in the upper 16-bit, and resetting the lower 16-bit (because
> that's 0 + arg<<16).
> Since CFG_IMMR is on a 64KB boundary, its lower 16 bitare zero, so "lis
> r3,CFG_IMMR at h" simply loads CFG_IMMR to r3.
>
> Udi
>
> seaman wrote:
> > In u-boot/cpu/mpc8xx/start.S,I usually find this symbol "@",such as
> > followed:
> >
> > _start:
> >  lis r3, CFG_IMMR at h  /* position IMMR */
> >  mtspr 638, r3
> >  li r21, BOOTFLAG_COLD /* Normal Power-On: Boot from FLASH */
> >  b boot_cold
> >
> > what does it means? Thank you!
> >
> >
> >
> >
> >
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> >
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> >
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>