linux-kernel - Re: [PATCH 2/2] x86 boot: early_res_to

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Date:	Thu, 26 Jun 2008 00:13:29 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, andi@...stfloor.org,
	mingo@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86 boot: early_res_to_e820

On Wed, Jun 25, 2008 at 11:33 PM, Huang, Ying <ying.huang@...el.com> wrote:
> This patch reserves some memory areas of early_res in E820 as
> E820_RESVD_KERN. This is used mainly on i386, for some memory area
> from boot-loader and in highmem, such as linked list of setup_data,
> EFI memory map, etc.
>
> This patch is based on latest x86/master branch of git-x86 tree and
> has been tested on i386 and x86_64 platform.
>
> Signed-off-by: Huang Ying <ying.huang@...el.com>
>
> ---
>  arch/x86/kernel/e820.c     |   22 ++++++++++++++++++++++
>  arch/x86/kernel/setup_32.c |    2 ++
>  include/asm-x86/e820.h     |    1 +
>  3 files changed, 25 insertions(+)
>
> --- a/arch/x86/kernel/e820.c
> +++ b/arch/x86/kernel/e820.c
> @@ -844,6 +844,28 @@ void __init early_res_to_bootmem(u64 sta
>        }
>  }
>
> +void __init early_res_to_e820(u64 start, u64 end)
> +{
> +       int i, changed = 0;
> +       u64 final_start, final_end;
> +       for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
> +               struct early_res *r = &early_res[i];
> +               final_start = max(start, r->start);
> +               final_end = min(end, r->end);
> +               if (final_start >= final_end)
> +                       continue;
> +               printk(KERN_INFO "  early res: %d [%llx-%llx] %s\n", i,
> +                       final_start, final_end - 1, r->name);
> +               e820_update_range(final_start, final_end - final_start,
> +                                 E820_RAM, E820_RESVD_KERN);
> +               changed = 1;
> +       }
> +       if (changed) {
> +               printk(KERN_INFO "update e820 for early_res\n");
> +               update_e820();
> +       }
> +}
> +
>  /* Check for already reserved areas */
>  static inline int __init bad_addr(u64 *addrp, u64 size, u64 align)
>  {
> --- a/include/asm-x86/e820.h
> +++ b/include/asm-x86/e820.h
> @@ -96,6 +96,7 @@ extern void reserve_early(u64 start, u64
>  extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
>  extern void free_early(u64 start, u64 end);
>  extern void early_res_to_bootmem(u64 start, u64 end);
> +extern void early_res_to_e820(u64 start, u64 end);
>  extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
>
>  extern unsigned long e820_end_of_ram(void);
> --- a/arch/x86/kernel/setup_32.c
> +++ b/arch/x86/kernel/setup_32.c
> @@ -447,6 +447,8 @@ void __init setup_arch(char **cmdline_p)
>         acpi_numa_init();
>  #endif
>
> +       early_res_to_e820(max_low_pfn<<PAGE_SHIFT, -1);
> +
>        initmem_init(0, max_pfn);
>
>  #ifdef CONFIG_ACPI_SLEEP
>
> --

this one is not needed.

YH
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