Re: [Minios-devel] [UNIKRAFT PATCHv6 29/37] plat/x86: Implement system_off for x86

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Reviewed-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>

On 14.09.2018 09:57, Wei Chen wrote:
> Implement system_off for x86 can make shutdown.c become
> architecture independent.
>
> Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
> ---
>   plat/common/include/x86/cpu.h |  1 +
>   plat/common/x86/cpu_native.c  | 11 +++++++++++
>   2 files changed, 12 insertions(+)
>
> diff --git a/plat/common/include/x86/cpu.h b/plat/common/include/x86/cpu.h
> index 104f53e..04d8731 100644
> --- a/plat/common/include/x86/cpu.h
> +++ b/plat/common/include/x86/cpu.h
> @@ -31,6 +31,7 @@
>   
>   
>   void halt(void);
> +void system_off(void);
>   
>   static inline void cpuid(__u32 leaf, __u32 *eax, __u32 *ebx,
>                 __u32 *ecx, __u32 *edx)
> diff --git a/plat/common/x86/cpu_native.c b/plat/common/x86/cpu_native.c
> index 0330a20..57ea3a2 100644
> --- a/plat/common/x86/cpu_native.c
> +++ b/plat/common/x86/cpu_native.c
> @@ -47,3 +47,14 @@ unsigned long read_cr2(void)
>   
>   	return cr2;
>   }
> +
> +void system_off(void)
> +{
> +       /*
> +        * Poke the QEMU "isa-debug-exit" device to "shutdown". Should be
> +        * harmless if it is not present. This is used to enable automated
> +        * tests on virtio.  Note that the actual QEMU exit() status will
> +        * be 83 ('S', 41 << 1 | 1).
> +        */
> +       outw(0x501, 41);
> +}
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