[AMD Public Use] Thanks for the feedback, Lazlo. I agree with your point on the optimal format for these #defines. I think it would be best to submit the current patch as is given that the same feedback could (should?) be applied to various other #defines in the file, eg: EFI_ACPI_DMA_BUS_MASTER_MASK 0x04, which only applies to Bit 2 and EFI_ACPI_IRQ_POLARITY_MASK 0x08, ... Bit 3 and EFI_ACPI_IRQ_MODE 0x01, ... bit 0 IMO if these defines were to be updated for clarity, it should probably be done for the whole file in a separate commit.
Thanks, Paul -----Original Message----- From: Laszlo Ersek <ler...@redhat.com> Sent: Friday, August 28, 2020 10:06 AM To: devel@edk2.groups.io; Grimes, Paul <paul.gri...@amd.com> Cc: Michael D Kinney <michael.d.kin...@intel.com>; Liming Gao <gaolim...@byosoft.com.cn>; Zhiguang Liu <zhiguang....@intel.com> Subject: Re: [edk2-devel] [PATCH v1 1/1] MdePkg: Correcting EFI_ACPI_DMA_TRANSFER_TYPE_16_BIT definition [CAUTION: External Email] On 08/27/20 22:40, Paul wrote: > In Acpi10.h, EFI_ACPI_DMA_TRANSFER_TYPE_16_BIT is defined as 0x10, but > should be 0x02 per the ACPI Specification. > > REF:https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2F > bugzilla.tianocore.org%2Fshow_bug.cgi%3Fid%3D2937&data=02%7C01%7Cp > aul.grimes%40amd.com%7C82b28bb6544a4612fc1108d84b749dc6%7C3dd8961fe488 > 4e608e11a82d994e183d%7C0%7C0%7C637342311528396385&sdata=7vHYIHHaJU > 4yrXzAWtv5xTf%2BQfclAUBusz278%2F6I%2BRY%3D&reserved=0 > > Cc: Michael D Kinney <michael.d.kin...@intel.com> > Cc: Liming Gao <gaolim...@byosoft.com.cn> > Cc: Zhiguang Liu <zhiguang....@intel.com> > Signed-off-by: Paul G <paul.gri...@amd.com> > --- > MdePkg/Include/IndustryStandard/Acpi10.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/MdePkg/Include/IndustryStandard/Acpi10.h > b/MdePkg/Include/IndustryStandard/Acpi10.h > index fa06eefbb6e6..adeb5ae8c219 100644 > --- a/MdePkg/Include/IndustryStandard/Acpi10.h > +++ b/MdePkg/Include/IndustryStandard/Acpi10.h > @@ -358,7 +358,7 @@ typedef struct { > #define EFI_ACPI_DMA_TRANSFER_TYPE_MASK 0x03 > > #define EFI_ACPI_DMA_TRANSFER_TYPE_8_BIT 0x00 > > #define EFI_ACPI_DMA_TRANSFER_TYPE_8_BIT_AND_16_BIT 0x01 > > -#define EFI_ACPI_DMA_TRANSFER_TYPE_16_BIT 0x10 > > +#define EFI_ACPI_DMA_TRANSFER_TYPE_16_BIT 0x02 > > > > // > > // IO Information > Good catch. The ACPI spec text was likely cut n' pasted into the edk2 source, and then prefixed with "0x". The spec says, """ Bits [1:0] DMA transfer type preference, _SIZ 00 8-bit only 01 8- and 16-bit 10 16-bit only 11 Reserved """ but that's in binary, not in hexadecimal. In fact, the leading zero on *all four* macros (including EFI_ACPI_DMA_TRANSFER_TYPE_MASK) is misleading. In hex, the leading zero in the current macros stands for bits [7:4], which are completely irrelevant for the _SIZ bit-field in the DMA Descriptor. So optimally we'd have #define EFI_ACPI_DMA_TRANSFER_TYPE_MASK 0x3 #define EFI_ACPI_DMA_TRANSFER_TYPE_8_BIT 0x0 #define EFI_ACPI_DMA_TRANSFER_TYPE_8_BIT_AND_16_BIT 0x1 #define EFI_ACPI_DMA_TRANSFER_TYPE_16_BIT 0x2 But I agree the current patch is OK too: Reviewed-by: Laszlo Ersek <ler...@redhat.com> I also agree it's a bugfix and should be merged now. Thanks Laszlo -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#64766): https://edk2.groups.io/g/devel/message/64766 Mute This Topic: https://groups.io/mt/76462757/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
