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

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Date:	Wed, 15 Aug 2007 16:16:42 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Huang, Ying" <ying.huang@...el.com>
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 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.

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