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

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Date:	Wed, 24 Sep 2008 11:20:57 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Russ Anderson <rja@....com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>
Subject: Re: [PATCH 2/4] x86: Add UV bios call infrastructure

Hi, Russ,

On Mon, 2008-09-22 at 16:09 -0500, Russ Anderson wrote:
> +
> +s64 uv_bios_call(int which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
>  {
> -	const char *str;
> -	switch (status) {
> -	case  0: str = "Call completed without error";	break;
> -	case -1: str = "Not implemented";		break;
> -	case -2: str = "Invalid argument";		break;
> -	case -3: str = "Call completed with error";	break;
> -	default: str = "Unknown BIOS status code";	break;
> -	}
> -	return str;
> +	struct sal_systab *tab = &sal_systab;
> +
> +	if (tab->function == (unsigned long)NULL)
> +		/*
> +		 * BIOS does not support SAL systab
> +		 */
> +		return BIOS_STATUS_UNIMPLEMENTED;
> +
> +	return efi_call6((void *)__va(tab->function),
> +					which, a1, a2, a3, a4, a5);
>  }
[...]
> +#else	/* !CONFIG_EFI */
> +/*
> + * IF EFI is not configured, have the EFI calls return unimplemented.
> + */
> +u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
> +			u64 arg4, u64 arg5, u64 arg6)
> +{
> +	return  BIOS_STATUS_UNIMPLEMENTED;
> +}
> +
> +void uv_bios_init(void) { }
> +#endif
> +
[...]
> +
> +#ifndef CONFIG_EFI
> +extern u64 efi_call6(void *, u64, u64, u64, u64, u64, u64);
> +#endif

Either wrap efi_call6() in uv_bios_call() inside #ifdef CONFIG_EFI, or
add efi_call<x>() implementation when CONFIG_EFI is undefined into
include/asm-x86/efi.h.

Best Regards,
Huang Ying


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