linux-kernel - Re: [PATCH 2/4] x86: Add UV bios call infrastructure v2

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Date:	Mon, 29 Sep 2008 09:31:44 -0500
From:	Russ Anderson <rja@....com>
To:	Huang Ying <ying.huang@...el.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>,
	Russ Anderson <rja@....com>
Subject: Re: [PATCH 2/4] x86: Add UV bios call infrastructure v2

On Sun, Sep 28, 2008 at 10:01:07AM -0500, Russ Anderson wrote:
> On Sat, Sep 27, 2008 at 09:21:35AM +0800, Huang Ying wrote:
> > On Fri, 2008-09-26 at 15:02 -0500, Russ Anderson wrote:
> > > Index: linux/include/asm-x86/efi.h
> > > ===================================================================
> > > --- linux.orig/include/asm-x86/efi.h	2008-09-26 14:13:24.000000000 -0500
> > > +++ linux/include/asm-x86/efi.h	2008-09-26 14:13:36.000000000 -0500
> > > @@ -49,6 +49,20 @@ extern u64 efi_call5(void *fp, u64 arg1,
> > >  extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
> > >  		     u64 arg4, u64 arg5, u64 arg6);
> > >  
> > > +
> > > +#ifndef CONFIG_EFI
> > > +/*
> > > + * IF EFI is not configured, have the EFI calls return -ENOSYS.
> > > + */
> > > +#define efi_call0(_f)					(-ENOSYS)
> > > +#define efi_call1(_f, _a1)				(-ENOSYS)
> > > +#define efi_call2(_f, _a1, _a2)				(-ENOSYS)
> > > +#define efi_call3(_f, _a1, _a2, _a3)			(-ENOSYS)
> > > +#define efi_call4(_f, _a1, _a2, _a3, _a4)		(-ENOSYS)
> > > +#define efi_call5(_f, _a1, _a2, _a3, _a4, _a5)		(-ENOSYS)
> > > +#define efi_call6(_f, _a1, _a2, _a3, _a4, _a5, _a6)	(-ENOSYS)
> > > +#endif /* CONFIG_EFI */
> > > +
> > >  #define efi_call_phys0(f)			\
> > >  	efi_call0((void *)(f))
> > >  #define efi_call_phys1(f, a1)			\
> > 
> > efi_call_virt<n> and efi_call_phys<n> is the API instead of efi_call<n>.
> 
> #define efi_call_virt6(f, a1, a2, a3, a4, a5, a6)                       \
>         efi_call6((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
>                   (u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
> 
> efi_call_virt6() uses efi.systab->runtime->f.
> My call needs to use uv_systab, not efi.systab.

After thinking about this, if a new runtime call was added to
efi_runtime_services_t, then the existing efi_call_virt<n> could be
used.  This would remove the need to create uv_systab.  I'll post
a patch shortly.



-- 
Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc          rja@....com
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