Re: [Qemu-devel] [RESEND PATCH 05/23] hw/acpi/aml-build: Add aml_interrupt() term

[Shannon Zhao <zhaoshenglong@huawei.com>]

On 2015/5/20 19:05, Igor Mammedov wrote:
> On Wed, 20 May 2015 12:23:02 +0800
> Shannon Zhao <zhaoshenglong@huawei.com> wrote:
> 
>> > From: Shannon Zhao <shannon.zhao@linaro.org>
>> > 
>> > Add aml_interrupt() for describing device interrupt in resource template.
>> > These can be used to generating DSDT table for ACPI on ARM.
>> > 
>> > Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
>> > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
>> > ---
>> >  hw/acpi/aml-build.c         | 22 ++++++++++++++++++++++
>> >  include/hw/acpi/aml-build.h | 42 ++++++++++++++++++++++++++++++++++++++++++
>> >  2 files changed, 64 insertions(+)
>> > 
>> > diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
>> > index 805a0ad..5f06367 100644
>> > --- a/hw/acpi/aml-build.c
>> > +++ b/hw/acpi/aml-build.c
>> > @@ -531,6 +531,28 @@ Aml *aml_memory32_fixed(uint32_t addr, uint32_t size,
>> >      return var;
>> >  }
>> >  
>> > +/*
>> > + * ACPI 5.0: 6.4.3.6 Extended Interrupt Descriptor
>> > + * Type 1, Large Item Name 0x9
>> > + */
>> > +Aml *aml_interrupt(AmlConsumerAndProducer con_and_pro,
>> > +                   AmlLevelAndEdge level_and_edge,
>> > +                   AmlActiveHighAndLow high_and_low, AmlShared shared,
>> > +                   uint32_t irq)
>> > +{
>> > +    Aml *var = aml_alloc();
>> > +    uint8_t irq_flags = con_and_pro | (level_and_edge << 1)
>> > +                        | (high_and_low << 2) | (shared << 3);
>> > +
>> > +    build_append_byte(var->buf, 0x89); /* Extended irq descriptor */
>> > +    build_append_byte(var->buf, 6); /* Length, bits[7:0] minimum value = 6 */
>> > +    build_append_byte(var->buf, 0); /* Length, bits[15:8] minimum value = 0 */
>> > +    build_append_byte(var->buf, irq_flags); /* Interrupt Vector Information. */
>> > +    build_append_byte(var->buf, 0x01); /* Interrupt table length = 1 */
>> > +    build_append_4bytes(var->buf, irq); /* Interrupt Number */
> Just looking at the patch I have no idea what above line does;
> 
> using 4 build_append_byte() is much clearer and matches the spec 1:1
> when comparing.
> 

I feel awkward and have no word to convince you. If you insist on this,
I'll go back to 4 build_append_byte().

-- 
Shannon