Re: [Xen-devel] [PATCH v2 04/18] mini-os: add description of x86 memory usage

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>]

Juergen Gross, on Fri 05 Aug 2016 19:35:48 +0200, wrote:
> Add a brief description how the physical and virtual address usage
> looks like on x86 to include/x86/arch_mm.h
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

Acked-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>

> ---
>  include/x86/arch_mm.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/include/x86/arch_mm.h b/include/x86/arch_mm.h
> index 58f29fc..f756dab 100644
> --- a/include/x86/arch_mm.h
> +++ b/include/x86/arch_mm.h
> @@ -36,6 +36,26 @@
>  #endif
>  #endif
>  
> +/*
> + * Physical address space usage:
> + *
> + * 0..._edata: kernel text/data
> + * *stack    : kernel stack (thread 0)
> + * hypervisor allocated data: p2m_list, start_info page, xenstore page,
> + *                            console page, initial page tables
> + * bitmap of allocated pages
> + * pages controlled by the page allocator
> + *
> + *
> + * Virtual address space usage:
> + *
> + * 1:1 mapping of physical memory starting at VA(0)
> + * 1 unallocated page
> + * demand map area (32 bits: 2 GB, 64 bits: 128 GB) for virtual allocations
> + * 1 unallocated page
> + * with libc: heap area (32 bits: 1 GB, 64 bits: 128 GB)
> + */
> +
>  #define L1_FRAME                1
>  #define L2_FRAME                2
>  #define L3_FRAME                3
> -- 
> 2.6.6
> 

-- 
Samuel
<B> l'alim je sais où elle est, elle est juste à côté de la dame qui dort
<g> B: clairement faut revoir les priorités dans la vie
<g> B: une dame ça se retrouve, un uptime...

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