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SubjectRe: AMD Geode i686
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On Mon, Mar 01, 2010 at 11:03:09PM +0100, Matteo Croce wrote:
> Hi,
> I have refreshed my AMD Geode i686 patch with NOPL and I have added a
> new nice feature.
> When a NOPL is found the parser looks for any NOPL after the current
> one, so they are emulated in bulk.
> Tested ok on a Pcengines Alix.
>
> Signed-off-by: Matteo Croce <technoboy85@gmail.com>
>
> --- a/arch/x86/kernel/Makefile 2010-03-01 01:18:51.697166322 +0100
> +++ b/arch/x86/kernel/Makefile 2010-03-01 01:19:45.727095700 +0100
> @@ -89,6 +89,8 @@
> obj-$(CONFIG_HPET_TIMER) += hpet.o
>
> obj-$(CONFIG_K8_NB) += k8.o
> +obj-$(CONFIG_MGEODEGX1) += nopl_emu.o
> +obj-$(CONFIG_MGEODE_LX) += nopl_emu.o
> obj-$(CONFIG_DEBUG_RODATA_TEST) += test_rodata.o
> obj-$(CONFIG_DEBUG_NX_TEST) += test_nx.o
>
> --- a/arch/x86/kernel/cpu/amd.c 2010-03-01 01:18:51.737097341 +0100
> +++ b/arch/x86/kernel/cpu/amd.c 2010-03-01 01:19:27.867865836 +0100
> @@ -138,8 +138,10 @@
> }
>
> if (c->x86_model == 10) {
> - /Index: linux-2.6.33/arch/x86/kernel/Makefile
> ===================================================================
> * AMD Geode LX is model 10 */
> - /* placeholder for any needed mods */
> + /* Geode only lacks the NOPL instruction to be i686,
> + but we can emulate it in the exception handler
> + and promote it to a class 6 cpu */
> + boot_cpu_data.x86 = 6;
> return;
> }
> }
> --- a/arch/x86/kernel/entry_32.S 2010-03-01 01:18:51.717096708 +0100
> +++ b/arch/x86/kernel/entry_32.S 2010-03-01 01:19:27.867865836 +0100
> @@ -960,7 +960,11 @@
> RING0_INT_FRAME
> pushl $0
> CFI_ADJUST_CFA_OFFSET 4
> +#ifdef CONFIG_MGEODE_LX
> + pushl $do_nopl_emu
> +#else
> pushl $do_invalid_op
> +#endif

How does this work for MGEODEGX1 when it looks for MGEODE_LX? It seems
you made both link against the code above after all. Is this wrong or
the above?

Can it not work if you want to run a generic kernel on your Geode rather
than one built explicitly for the LX? I build one kernel to run on
Geode SC1200 and Geode LX.

--
Len Sorensen


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