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MdeModulePkg: document workaround for EFI_RUNTIME_EVENT_ENTRY PI spec bug

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The PI spec (v1.7) correctly specifies "EFI_RUNTIME_EVENT_ENTRY.Event" in
natural language, but the field type in the structure definition itself is
wrong -- it should be EFI_EVENT, not (EFI_EVENT*).

This spec bug is likely unfixable for compatibility reasons, and so edk2
works it around already. We should clearly document the workaround.

Functionally, this patch is a no-op.

(I've also requested a non-normative (informative) clarification for the
PI spec: <https://mantis.uefi.org/mantis/view.php?id=2017>.)

Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
This commit is contained in:
Laszlo Ersek
2019-09-07 13:17:49 +02:00
parent 0bee7dbd2b
commit d342d318e9
2 changed files with 17 additions and 1 deletions
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10
MdeModulePkg/Core/RuntimeDxe/Runtime.c
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@@ -285,8 +285,16 @@ RuntimeDriverSetVirtualAddressMap (
for (Link = mRuntime.EventHead.ForwardLink; Link != &mRuntime.EventHead; Link = Link->ForwardLink) {
RuntimeEvent = BASE_CR (Link, EFI_RUNTIME_EVENT_ENTRY, Link);
if ((RuntimeEvent->Type & EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE) == EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE) {
//
// Work around the bug in the Platform Init specification (v1.7),
// reported as Mantis#2017: "EFI_RUNTIME_EVENT_ENTRY.Event" should have
// type EFI_EVENT, not (EFI_EVENT*). The PI spec documents the field
// correctly as "The EFI_EVENT returned by CreateEvent()", but the type
// of the field doesn't match the natural language description. Therefore
// we need an explicit cast here.
//
RuntimeEvent->NotifyFunction (
RuntimeEvent->Event,
(EFI_EVENT) RuntimeEvent->Event,
RuntimeEvent->NotifyContext
);
}