linux-kernel - Re: [PATCH] x86: extend e820 ealy_res support 32bit

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Date:	Wed, 28 May 2008 13:48:39 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"Rusty Russell" <rusty@...tcorp.com.au>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: extend e820 ealy_res support 32bit - fix #2

On Wed, May 28, 2008 at 3:01 AM, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> Yinghai Lu wrote:
>>
>> can you try attached patch?
>>
>
> Thanks, that nearly works.  I needed the patch below to get it to
> successfully boot.
>
> For reference, this is what the early reserve map looks like now:
>
> (early) 256MB LOWMEM available.
> (early)   low ram: 02634000 - 10000000
> (early)   bootmap 02634000 - 02636000
> (early)   early res: 0 [0-fff] BIOS data page
> (early)   early res: 1 [1000-1fff] EX TRAMPOLINE
> (early)   early res: 2 [6000-6fff] TRAMPOLINE
> (early)   early res: 3 [25db000-261dfff] XEN
> (early)   early res: 4 [1000000-18a8303] TEXT DATA BSS
> (early)   early res: 5 [18a9000-25dafff] RAMDISK
> (early)   early res: 6 [261e000-2633fff] INIT_PG_TABLE
> (early)   early res: 7 [2634000-2635fff] BOOTMAP
>
>
>   J
>
>
> Subject: xen: reserve_early Xen-specific memory
>
> Make sure that the start_info and pfn->mfn translation array are reserved.
> i386_start_kernel will arrange to reserve the kernel code/data, initrd
> and pagetable.
>
> Also, add prototype for i386_start_kernel.
>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> ---
> arch/x86/xen/enlighten.c |    9 +++++++++
> include/asm-x86/setup.h  |    1 +
> 2 files changed, 10 insertions(+)
>
> ===================================================================
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1266,6 +1266,15 @@
>                add_preferred_console("hvc", 0, NULL);
>        }
>
> +       /*
> +        * Reserve Xen bits:
> +        *  - mfn_list
> +        *  - xen_start_info
> +        * See comment above "struct start_info" in <xen/interface/xen.h>
> +        */
> +       reserve_early(__pa(xen_start_info->mfn_list),
> +                     __pa(xen_start_info->pt_base), "XEN");
> +

can we use e820 entries for that? So the domain builder could have
several entries for E820_RAM and E820_RESERVED...

>        /* Start the world */
>        i386_start_kernel();
> }
> ===================================================================
> --- a/include/asm-x86/setup.h
> +++ b/include/asm-x86/setup.h
> @@ -58,6 +58,7 @@
> int __init copy_e820_map(struct e820entry *biosmap, int nr_map);
> void __init add_memory_region(unsigned long long start,
>                              unsigned long long size, int type);
> +void __init i386_start_kernel(void);

will need x86_64_start_kernel there, maybe we should change all name
to x86_start_kernel

YH
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