linux-kernel - Re: [PATCH 0/3] x86_64 EFI runtime service support

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Date:	Thu, 16 Aug 2007 15:52:29 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Chandramouli Narayanan <mouli@...ux.intel.com>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 0/3] x86_64 EFI runtime service support

On Thu, 2007-08-16 at 07:16 +0800, Andrew Morton wrote:
> On Mon, 13 Aug 2007 15:30:19 +0800
> "Huang, Ying" <ying.huang@...el.com> wrote:
> 
> > Following sets of patches add EFI/UEFI (Unified Extensible Firmware
> > Interface) runtime services support to x86_64 architecture.
> 
> OK, we have a major trainwreck when these patches meet Peter's
> get-newsetup.patch.
> 
> I'm halfway into fixing it when I see this.  You have:
> 
>  #define SYS_DESC_TABLE (*(struct sys_desc_table_struct*)(PARAM+0xa0))
> +#define EFI_LOADER_SIG ((unsigned char *)(PARAM+0x1c0))
> +#define EFI_MEMDESC_SIZE (*((unsigned int *) (PARAM+0x1c4)))
> +#define EFI_MEMDESC_VERSION (*((unsigned int *) (PARAM+0x1c8)))
> +#define EFI_MEMMAP_SIZE (*((unsigned int *) (PARAM+0x1cc)))
> +#define EFI_MEMMAP (*((unsigned long *)(PARAM+0x1d0)))
> +#define EFI_SYSTAB (*((unsigned long *)(PARAM+0x1d8)))
>  #define MOUNT_ROOT_RDONLY (*(unsigned short *) (PARAM+0x1F2))
> 
> But Peter's include/asm-i386/bootparam.h has:
> 
> struct efi_info {
>         u32 _pad1;
>         u32 efi_systab;
>         u32 efi_memdesc_size;
>         u32 efi_memdesc_version;
>         u32 efi_memmap;
>         u32 efi_memmap_size;
>         u32 _pad2[2];
> };
> 
> /* The so-called "zeropage" */
> struct boot_params {
>         struct screen_info screen_info;                 /* 0x000 */
>         struct apm_bios_info apm_bios_info;             /* 0x040 */
>         u8  _pad2[12];                                  /* 0x054 */
>         struct ist_info ist_info;                       /* 0x060 */
>         u8  _pad3[16];                                  /* 0x070 */
>         u8  hd0_info[16];       /* obsolete! */         /* 0x080 */
>         u8  hd1_info[16];       /* obsolete! */         /* 0x090 */
>         struct sys_desc_table sys_desc_table;           /* 0x0a0 */
>         u8  _pad4[144];                                 /* 0x0b0 */
>         struct edid_info edid_info;                     /* 0x140 */
>         struct efi_info efi_info;                       /* 0x1c0 */
>         u32 alt_mem_k;                                  /* 0x1e0 */
> 
> So for example, Peter has memdesc_size at 0x1c8 and you have it at
> 0x1c4.
> 
> I'll give up and will drop the EFI patches.  I'd suggest that you work
> with
> Peter on getting these patches integrated.
> 

OK, I will work with Peter to solve the problem.

Best Regards,
Huang Ying
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