Re: [Qemu-devel] [RFC] acpi: add reset register to fadt

[Marcel Apfelbaum]

On 03/28/2015 05:46 PM, Reza Jelveh wrote:
> Some operating systems such as FreeBSD and Mac OSX need the reset_register
> section of the FADT filled to know which port to write to for a system reset.
>
> What is the right way to set the reset_val and the reset addr in this case?
> ---
>   hw/i386/acpi-build.c | 5 +++++
>   hw/i386/acpi-defs.h  | 2 ++
>   2 files changed, 7 insertions(+)
>
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index d0a5c85..21c1453 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -361,6 +361,11 @@ static void fadt_setup(AcpiFadtDescriptorRev1 *fadt, 
> AcpiPmInfo *pm)
>                                 (1 << ACPI_FADT_F_SLP_BUTTON) |
>                                 (1 << ACPI_FADT_F_RTC_S4));
>       fadt->flags |= cpu_to_le32(1 << ACPI_FADT_F_USE_PLATFORM_CLOCK);
> +    fadt->flags |= cpu_to_le32(1 << ACPI_FADT_F_RESET_REG_SUP);
> +    fadt->reset_val = 0xf;
> +    fadt->reset_reg.address_space_id   = aml_system_io;
> +    fadt->reset_reg.register_bit_width = 8;
> +    fadt->reset_reg.address            = ICH9_RST_CNT_IOPORT;
Hi,

Is this for both PC and Q35? Because I don't think PC has ICH9_RST_CNT_IOPORT.

Thanks,
Marcel

>       /* APIC destination mode ("Flat Logical") has an upper limit of 8 CPUs
>        * For more than 8 CPUs, "Clustered Logical" mode has to be used
>        */
> diff --git a/hw/i386/acpi-defs.h b/hw/i386/acpi-defs.h
> index c4468f8..960c833 100644
> --- a/hw/i386/acpi-defs.h
> +++ b/hw/i386/acpi-defs.h
> @@ -132,6 +132,8 @@ struct AcpiFadtDescriptorRev1
>       uint8_t  reserved4a;             /* Reserved */
>       uint8_t  reserved4b;             /* Reserved */
>       uint32_t flags;
> +    Acpi20GenericAddress reset_reg;
> +    uint8_t reset_val;
>   } QEMU_PACKED;
>   typedef struct AcpiFadtDescriptorRev1 AcpiFadtDescriptorRev1;