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[edk2,v1,01/21] ArmPkg: allow HYP timer interrupt to be omitted

Message ID 1422025390-8036-2-git-send-email-ard.biesheuvel@linaro.org
State New
Headers show

Commit Message

Ard Biesheuvel Jan. 23, 2015, 3:02 p.m. UTC 
The DT binding for the ARM generic timer describes the secure,
non-secure, virtual and hypervisor timer interrupts, respectively.
However, under virtualization, only the virtual timer is usable, and
the device tree may omit the hypervisor timer interrupt. (Other timer
interrupts cannot be omitted simply due to the fact that the virtual
timer is listed third)

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 ArmPkg/Drivers/TimerDxe/TimerDxe.c                         | 14 +++++++++++---
 .../ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c           |  4 ++--
 2 files changed, 13 insertions(+), 5 deletions(-)
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Patch

diff --git a/ArmPkg/Drivers/TimerDxe/TimerDxe.c b/ArmPkg/Drivers/TimerDxe/TimerDxe.c
index d0a819fc2729..1169d426b255 100644
--- a/ArmPkg/Drivers/TimerDxe/TimerDxe.c
+++ b/ArmPkg/Drivers/TimerDxe/TimerDxe.c
@@ -369,7 +369,8 @@  TimerInitialize (
 {
   EFI_HANDLE  Handle = NULL;
   EFI_STATUS  Status;
-  UINTN TimerCtrlReg;
+  UINTN       TimerCtrlReg;
+  UINT32      TimerHypIntrNum;
 
   if (ArmIsArchTimerImplemented () == 0) {
     DEBUG ((EFI_D_ERROR, "ARM Architectural Timer is not available in the CPU, hence cann't use this Driver \n"));
@@ -395,8 +396,15 @@  TimerInitialize (
   Status = gInterrupt->RegisterInterruptSource (gInterrupt, PcdGet32 (PcdArmArchTimerVirtIntrNum), TimerInterruptHandler);
   ASSERT_EFI_ERROR (Status);
 
-  Status = gInterrupt->RegisterInterruptSource (gInterrupt, PcdGet32 (PcdArmArchTimerHypIntrNum), TimerInterruptHandler);
-  ASSERT_EFI_ERROR (Status);
+  //
+  // The hypervisor timer interrupt may be omitted by implementations that
+  // execute under virtualization.
+  //
+  TimerHypIntrNum = PcdGet32 (PcdArmArchTimerHypIntrNum);
+  if (TimerHypIntrNum != 0) {
+    Status = gInterrupt->RegisterInterruptSource (gInterrupt, TimerHypIntrNum, TimerInterruptHandler);
+    ASSERT_EFI_ERROR (Status);
+  }
 
   Status = gInterrupt->RegisterInterruptSource (gInterrupt, PcdGet32 (PcdArmArchTimerSecIntrNum), TimerInterruptHandler);
   ASSERT_EFI_ERROR (Status);
diff --git a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
index 751864d4db9c..4e4f608923d3 100644
--- a/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
+++ b/ArmPlatformPkg/ArmVirtualizationPkg/VirtFdtDxe/VirtFdtDxe.c
@@ -274,7 +274,7 @@  InitializeVirtFdtDxe (
       //  hypervisor timers, in that order.
       //
       InterruptProp = fdt_getprop (DeviceTreeBase, Node, "interrupts", &Len);
-      ASSERT (Len == 48);
+      ASSERT (Len == 36 || Len == 48);
 
       SecIntrNum = fdt32_to_cpu (InterruptProp[0].Number)
                    + (InterruptProp[0].Type ? 16 : 0);
@@ -282,7 +282,7 @@  InitializeVirtFdtDxe (
                 + (InterruptProp[1].Type ? 16 : 0);
       VirtIntrNum = fdt32_to_cpu (InterruptProp[2].Number)
                     + (InterruptProp[2].Type ? 16 : 0);
-      HypIntrNum = fdt32_to_cpu (InterruptProp[3].Number)
+      HypIntrNum = Len < 48 ? 0 : fdt32_to_cpu (InterruptProp[3].Number)
                    + (InterruptProp[3].Type ? 16 : 0);
 
       DEBUG ((EFI_D_INFO, "Found Timer interrupts %d, %d, %d, %d\n",