Arguments for kernel_entry?

Arguments for kernel_entry?

[Richard Hodges]

Would anyone be able to provide information on the arguments
to kernel_entry (in head.S)?

The first two look pretty straightforward, argument count and
string vectors.  I assume that argument zero is actually the
first argument, and not "vmlinux"?

What are the third (ulong) and fourth (int *) arguments?  I have
read head.S and searched for days trying to find this info :-(

I thought PMON would be a decent reference, but run_target() only
seems to set $4 and $5, before calling _go().

Thanks!

-Richard

Re: Arguments for kernel_entry?

[Pete Popov]

On Mon, 2001-11-05 at 17:09, Richard Hodges wrote:
> Would anyone be able to provide information on the arguments
> to kernel_entry (in head.S)?
> 
> The first two look pretty straightforward, argument count and
> string vectors.  I assume that argument zero is actually the
> first argument, and not "vmlinux"?
> 
> What are the third (ulong) and fourth (int *) arguments?  I have
> read head.S and searched for days trying to find this info :-(
> 
> I thought PMON would be a decent reference, but run_target() only
> seems to set $4 and $5, before calling _go().

That's boot code specific. MIPS Tech's yamon passes:

0: number of arguments
1: pointer to first arg
2: pointer to environment variables
3: pointer to prom routines you can call


Pete

Re: Arguments for kernel_entry?

[Richard Hodges]

On 5 Nov 2001, Pete Popov wrote:

> On Mon, 2001-11-05 at 17:09, Richard Hodges wrote:
> > Would anyone be able to provide information on the arguments
> > to kernel_entry (in head.S)?
> > 
> > The first two look pretty straightforward, argument count and
> > string vectors.  I assume that argument zero is actually the
> > first argument, and not "vmlinux"?
> > 
> > What are the third (ulong) and fourth (int *) arguments?  I have
> > read head.S and searched for days trying to find this info :-(
> > 
> > I thought PMON would be a decent reference, but run_target() only
> > seems to set $4 and $5, before calling _go().
 
> That's boot code specific. MIPS Tech's yamon passes:
> 
> 0: number of arguments
> 1: pointer to first arg
> 2: pointer to environment variables
> 3: pointer to prom routines you can call

Okay, I think I have it now.  It looks like _only_ prom_init() is
interested in these arguments.

1.  kernel_entry() gives them to init_arch(),
2.  init_arch gives them to prom_init(),
3.  prom_init() does whatever it wants (eg, builds arcs_cmdline)
4.  init_arch ends with a call to start_kernel(), and the original
    arguments are effectively thrown away.

Or put more simply, the kernel_entry arguments are only used by
prom_init().  Is this right?

Thanks!

-Richard

Re: Arguments for kernel_entry?

[Pete Popov]

On Mon, 2001-11-05 at 17:44, Richard Hodges wrote:
> On 5 Nov 2001, Pete Popov wrote:
> 
> > On Mon, 2001-11-05 at 17:09, Richard Hodges wrote:
> > > Would anyone be able to provide information on the arguments
> > > to kernel_entry (in head.S)?
> > > 
> > > The first two look pretty straightforward, argument count and
> > > string vectors.  I assume that argument zero is actually the
> > > first argument, and not "vmlinux"?
> > > 
> > > What are the third (ulong) and fourth (int *) arguments?  I have
> > > read head.S and searched for days trying to find this info :-(
> > > 
> > > I thought PMON would be a decent reference, but run_target() only
> > > seems to set $4 and $5, before calling _go().
>  
> > That's boot code specific. MIPS Tech's yamon passes:
> > 
> > 0: number of arguments
> > 1: pointer to first arg
> > 2: pointer to environment variables
> > 3: pointer to prom routines you can call
> 
> Okay, I think I have it now.  It looks like _only_ prom_init() is
> interested in these arguments.
> 
> 1.  kernel_entry() gives them to init_arch(),
> 2.  init_arch gives them to prom_init(),
> 3.  prom_init() does whatever it wants (eg, builds arcs_cmdline)
> 4.  init_arch ends with a call to start_kernel(), and the original
>     arguments are effectively thrown away.
> 
> Or put more simply, the kernel_entry arguments are only used by
> prom_init().  Is this right?

I believe that's correct. arch/mips/kernel/setup.c saves arcs_cmdline in
command_line and that's the end of arcs_cmdline. 

Pete

_MIPS_SIM and others not defined by specs file warning

[Wayne Gowcher]

I am attempting to compile X using egcs-2.91.66 and I
am getting the following warnings which eventually
lead to the build failing.

 #warning "Macro _MIPS_ISA has not been defined by
specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 24: #warning "Macro _MIPS_SIM has not been
defined by specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 28: #warning "Macro _MIPS_SZINT has not been
defined by specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 32: #warning "Macro _MIPS_SZLONG has not been
defined by specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 36: #warning "Macro _MIPS_SZPTR has not been
defined by specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 44: #warning "Please update your GCC to GCC
2.7.2-4 or newer"

I have previously successfully compiled X using
egcs-2.90.29.

Could someone tell me what I may be doing wrong ?
Or what I need to pas into the compiler in order for
it to read the specs file correctly.

Would also be grateful if someone could point to me a
document or something explaining what the specs file
is and how it is used. By looking at it, I figure it
to be a file that sets integer lengths, procesor type
etc. But it sure would be nice to get a bigger picture
explanation.

TIA

Wayne

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_MIPS_SIM and others not defined by specs file warning

[Wayne Gowcher]

I am attempting to compile X using egcs-2.91.66 and I
am getting the following warnings which eventually
lead to the build failing.

 #warning "Macro _MIPS_ISA has not been defined by
specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 24: #warning "Macro _MIPS_SIM has not been
defined by specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 28: #warning "Macro _MIPS_SZINT has not been
defined by specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 32: #warning "Macro _MIPS_SZLONG has not been
defined by specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 36: #warning "Macro _MIPS_SZPTR has not been
defined by specs file"
../../../../config/makedepend/makedepend: warning: 
vga.c: 44: #warning "Please update your GCC to GCC
2.7.2-4 or newer"

I have previously successfully compiled X using
egcs-2.90.29.

Could someone tell me what I may be doing wrong ?
Or what I need to pas into the compiler in order for
it to read the specs file correctly.

Would also be grateful if someone could point to me a
document or something explaining what the specs file
is and how it is used. By looking at it, I figure it
to be a file that sets integer lengths, procesor type
etc. But it sure would be nice to get a bigger picture
explanation.

TIA

Wayne

__________________________________________________
Do You Yahoo!?
Find a job, post your resume.
http://careers.yahoo.com