Messages in this thread |  | | | Subject | Re: [PATCH 5/8] x86 boot: remap efi systab runtime from phys to virt | | From | "Huang, Ying" <> | | Date | Mon, 16 Jun 2008 15:02:39 +0800 | |
On Sun, 2008-06-15 at 23:30 -0700, Paul Jackson wrote:
> From: Paul Jackson <pj@sgi.com>
>
> One more efi entry needs its address converted from physical
> to virtual during boot: efi.systab->runtime.
>
> Signed-off-by: Paul Jackson <pj@sgi.com>
>
> ---
> arch/x86/kernel/efi.c | 1 +
> 1 file changed, 1 insertion(+)
>
> --- linux.orig/arch/x86/kernel/efi.c 2008-06-13 00:53:10.053599898 -0700
> +++ linux/arch/x86/kernel/efi.c 2008-06-13 00:53:21.762309008 -0700
> @@ -486,6 +486,7 @@ void __init efi_enter_virtual_mode(void)
> if (md->phys_addr <= systab && systab < end) {
> systab += md->virt_addr - md->phys_addr;
> efi.systab = (efi_system_table_t *) (unsigned long) systab;
> + efi.systab->runtime = __va(efi.systab->runtime);
> }
> }
Why do you need this? This should be done by firmware in
efi_set_virtual_address_map(). And this doesn't work on i386, because
runtime code/data area may be not in identity map area (that is > 768M).
even on x86_64, runtime code/data area can be non-identity mapped (For
example identity map is restricted by mem=xxx kernel parameter). Same
problem for
[PATCH 6/8] x86 boot: virtualize the efi runtime function callback
addresses
Best Regards,
Huang Ying
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