[U-Boot] [PATCH 2/2] x86: qemu: qfw: Implement acpi_get_rsdp_addr()

[Bin Meng <bmeng.cn@gmail.com>]

Hi Miao,

On Mon, Feb 5, 2018 at 2:00 PM, Miao Yan <yanmiaobest@gmail.com> wrote:
> On Tue, Jan 30, 2018 at 9:01 PM, Bin Meng <bmeng.cn@gmail.com> wrote:
>> U-Boot on QEMU does not build ACPI table by ourself, instead it uses
>> the prebuilt ACPI table via the qfw interface. This implements the
>> qfw version of acpi_get_rsdp_addr() for setup_zimage().
>>
>> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
>> ---
>>
>>  drivers/misc/qfw.c | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/misc/qfw.c b/drivers/misc/qfw.c
>> index a8af9e0..9a54803 100644
>> --- a/drivers/misc/qfw.c
>> +++ b/drivers/misc/qfw.c
>> @@ -222,6 +222,14 @@ out:
>>         free(table_loader);
>>         return addr;
>>  }
>> +
>> +ulong acpi_get_rsdp_addr(void)
>> +{
>> +       struct fw_file *file;
>> +
>> +       file = qemu_fwcfg_find_file("etc/acpi/rsdp");
>> +       return file->addr;
>
> qemu_fwcfg_find_file() can return NULL. Don't we need to check that ? Or
> can we assume etc/acpi/rsdp is always present ?
>
> Sorry for the late response.
>

I think you are correct. If file is NULL, we should return 0.

Regards,
Bin