According to chapter 7.1 "Event, Timer, and Task Priority Services"
TPL_HIGH_LEVEL should not be exposed to applications and drivers.

According to the discussion with EDK II contributors this implies that
CreateEvent() shall not allow to create events with TPL_HIGH_LEVEL.

Cf. https://edk2.groups.io/g/devel/message/76337

Cc: Samer El-Haj-Mahmoud <samer.el-haj-mahm...@arm.com>
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
 lib/efi_loader/efi_boottime.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 4777b35fd4..f6d5ba05e3 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -264,7 +264,6 @@ efi_status_t is_valid_tpl(efi_uintn_t tpl)
        case TPL_APPLICATION:
        case TPL_CALLBACK:
        case TPL_NOTIFY:
-       case TPL_HIGH_LEVEL:
                return EFI_SUCCESS;
        default:
                return EFI_INVALID_PARAMETER;
--
2.30.2

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