On 31 July 2015 at 17:16, Andrew Fish afish@apple.com wrote:
On Jul 31, 2015, at 7:49 AM, Ryan Harkin ryan.harkin@linaro.org wrote:
Make Arm and Aarch64 both use the same code, conditionally compiled, to check if the platform has GICv3.
Both source files for Arm and Aarch64 are now identical and the next step is to move to a common source file.
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ryan Harkin ryan.harkin@linaro.org Reviewed-by: Ard Biesheuvel ard.biesheuvel@linaro.org
.../Library/ArmGicArchLib/AArch64/ArmGicArchLib.c | 25 ++++++++++++++++------ ArmPkg/Library/ArmGicArchLib/Arm/ArmGicArchLib.c | 25 ++++++++++++++++------ 2 files changed, 36 insertions(+), 14 deletions(-)
diff --git a/ArmPkg/Library/ArmGicArchLib/AArch64/ArmGicArchLib.c b/ArmPkg/Library/ArmGicArchLib/AArch64/ArmGicArchLib.c index 9853c7b..36dbe41 100644 --- a/ArmPkg/Library/ArmGicArchLib/AArch64/ArmGicArchLib.c +++ b/ArmPkg/Library/ArmGicArchLib/AArch64/ArmGicArchLib.c @@ -15,7 +15,23 @@ #include <Library/ArmLib.h> #include <Library/ArmGicLib.h>
-STATIC ARM_GIC_ARCH_REVISION mGicArchRevision; +STATIC ARM_GIC_ARCH_REVISION mGicArchRevision = ARM_GIC_ARCH_REVISION_2;
+STATIC +RETURN_STATUS +EFIAPI +GicSystemRegistersSupported (
- VOID
- )
+{ +#if defined (MDE_CPU_ARM)
- return (ArmReadIdPfr1 () & ARM_PFR1_GIC);
+#elif defined(MDE_CPU_AARCH64)
- return (ArmReadIdPfr0 () & AARCH64_PFR0_GIC);
+#else
- #error "Unknown chipset."
+#endif +}
We usually don’t use processor specific #ifdef’s in code like this in the edk2.
That's probably why the code is filled with vast swathes of copy/paste/hack-one-line happening all over Arm*Pkg.
Although, I could split the only GicSystemRegistersSupported function into it's own arch specific files to fit within that regime.
Seems over the top to me. So unless it's a hard requirement, I'd resist it.
We usually isolate the code to a file that is processor specific, and use the INF file to point at the correct one.
Here is an example: https://github.com/tianocore/edk2/blob/master/MdePkg/Library/BasePeCoffLib/B...
[Sources] BasePeCoffLibInternals.h BasePeCoff.c
[Sources.IA32, Sources.X64, Sources.EBC] PeCoffLoaderEx.c
[Sources.IPF] Ipf/PeCoffLoaderEx.c
[Sources.ARM] Arm/PeCoffLoaderEx.c
[Sources.AARCH64] AArch64/PeCoffLoaderEx.c
This is a good example of where the arch specific sources are not copy/paste/hack, but split out for good reason.
Thanks,
Andrew Fish
RETURN_STATUS EFIAPI @@ -31,7 +47,7 @@ ArmGicArchLibInitialize ( // feature is implemented on the CPU. This is also convenient as our GICv3 // driver requires SRE. If only Memory mapped access is available we try to // drive the GIC as a v2.
- if (ArmReadIdPfr0 () & AARCH64_PFR0_GIC) {
- if (GicSystemRegistersSupported()) { // Make sure System Register access is enabled (SRE). This depends on
the // higher privilege level giving us permission, otherwise we will either // cause an exception here, or the write doesn't stick in which case we need @@ -46,13 +62,8 @@ ArmGicArchLibInitialize ( } if (IccSre & ICC_SRE_EL2_SRE) { mGicArchRevision = ARM_GIC_ARCH_REVISION_3;
goto Done;- mGicArchRevision = ARM_GIC_ARCH_REVISION_2;
-Done: return RETURN_SUCCESS; }
diff --git a/ArmPkg/Library/ArmGicArchLib/Arm/ArmGicArchLib.c b/ArmPkg/Library/ArmGicArchLib/Arm/ArmGicArchLib.c index f8822a2..75ba156 100644 --- a/ArmPkg/Library/ArmGicArchLib/Arm/ArmGicArchLib.c +++ b/ArmPkg/Library/ArmGicArchLib/Arm/ArmGicArchLib.c @@ -15,7 +15,23 @@ #include <Library/ArmLib.h> #include <Library/ArmGicLib.h>
-STATIC ARM_GIC_ARCH_REVISION mGicArchRevision; +STATIC ARM_GIC_ARCH_REVISION mGicArchRevision = ARM_GIC_ARCH_REVISION_2;
+STATIC +RETURN_STATUS +EFIAPI +GicSystemRegistersSupported (
- VOID
- )
+{ +#if defined (MDE_CPU_ARM)
- return (ArmReadIdPfr1 () & ARM_PFR1_GIC);
+#elif defined(MDE_CPU_AARCH64)
- return (ArmReadIdPfr0 () & AARCH64_PFR0_GIC);
+#else
- #error "Unknown chipset."
+#endif +}
RETURN_STATUS EFIAPI @@ -31,7 +47,7 @@ ArmGicArchLibInitialize ( // feature is implemented on the CPU. This is also convenient as our GICv3 // driver requires SRE. If only Memory mapped access is available we try to // drive the GIC as a v2.
- if (ArmReadIdPfr1 () & ARM_PFR1_GIC) {
- if (GicSystemRegistersSupported()) { // Make sure System Register access is enabled (SRE). This depends on
the // higher privilege level giving us permission, otherwise we will either // cause an exception here, or the write doesn't stick in which case we need @@ -46,13 +62,8 @@ ArmGicArchLibInitialize ( } if (IccSre & ICC_SRE_EL2_SRE) { mGicArchRevision = ARM_GIC_ARCH_REVISION_3;
goto Done;- mGicArchRevision = ARM_GIC_ARCH_REVISION_2;
-Done: return RETURN_SUCCESS; }
-- 2.1.0
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