Re: [Qemu-arm] [Qemu-devel] [PATCH v9 4/5] acpi: arm: add fw_cfg device node to dsdt

[Shannon Zhao <shannon.zhao@linaro.org>]

On 2016/2/20 2:20, Gabriel L. Somlo wrote:
> Add a fw_cfg device node to the ACPI DSDT. This is mostly
> informational, as the authoritative fw_cfg MMIO region(s)
> are listed in the Device Tree. However, since we are building
> ACPI tables, we might as well be thorough while at it...
>
> Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
> Tested-by: Laszlo Ersek <lersek@redhat.com>
> Reviewed-by: Marc Marí <markmb@redhat.com>
Reviewed-by: Shannon Zhao <shannon.zhao@linaro.org>

> ---
>   hw/arm/virt-acpi-build.c | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
>
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index 8cf9a21..7d7998b 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -81,6 +81,20 @@ static void acpi_dsdt_add_uart(Aml *scope, const MemMapEntry *uart_memmap,
>       aml_append(scope, dev);
>   }
>
> +static void acpi_dsdt_add_fw_cfg(Aml *scope, const MemMapEntry *fw_cfg_memmap)
> +{
> +    Aml *dev = aml_device("FWCF");
> +    aml_append(dev, aml_name_decl("_HID", aml_string("QEMU0002")));
> +    /* device present, functioning, decoding, not shown in UI */
> +    aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
> +
> +    Aml *crs = aml_resource_template();
> +    aml_append(crs, aml_memory32_fixed(fw_cfg_memmap->base,
> +                                       fw_cfg_memmap->size, AML_READ_WRITE));
> +    aml_append(dev, aml_name_decl("_CRS", crs));
> +    aml_append(scope, dev);
> +}
> +
>   static void acpi_dsdt_add_flash(Aml *scope, const MemMapEntry *flash_memmap)
>   {
>       Aml *dev, *crs;
> @@ -548,6 +562,7 @@ build_dsdt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info)
>       acpi_dsdt_add_uart(scope, &memmap[VIRT_UART],
>                          (irqmap[VIRT_UART] + ARM_SPI_BASE));
>       acpi_dsdt_add_flash(scope, &memmap[VIRT_FLASH]);
> +    acpi_dsdt_add_fw_cfg(scope, &memmap[VIRT_FW_CFG]);
>       acpi_dsdt_add_virtio(scope, &memmap[VIRT_MMIO],
>                       (irqmap[VIRT_MMIO] + ARM_SPI_BASE), NUM_VIRTIO_TRANSPORTS);
>       acpi_dsdt_add_pci(scope, memmap, (irqmap[VIRT_PCIE] + ARM_SPI_BASE),
>

-- 
Shannon