From 1831bc6add7219198e184568525f09d73553782e Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Sun, 26 Nov 2023 12:23:55 +0200
Subject: [PATCH] [NTOS:KE/x64] Implement initial IPI code

---
 ntoskrnl/ke/amd64/ipi.c | 50 +++++++++++++++++++++++++++++++++++++++++
 ntoskrnl/ke/ipi.c       |  4 ++++
 ntoskrnl/ntos.cmake     |  1 +
 3 files changed, 55 insertions(+)
 create mode 100644 ntoskrnl/ke/amd64/ipi.c

diff --git a/ntoskrnl/ke/amd64/ipi.c b/ntoskrnl/ke/amd64/ipi.c
new file mode 100644
index 00000000000..86c044c7d03
--- /dev/null
+++ b/ntoskrnl/ke/amd64/ipi.c
@@ -0,0 +1,50 @@
+/*
+ * PROJECT:     ReactOS Kernel
+ * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
+ * PURPOSE:     IPI code for x64
+ * COPYRIGHT:   Copyright 2023 Timo Kreuzer <timo.kreuzer@reactos.org>
+ */
+
+/* INCLUDES *******************************************************************/
+
+#include <ntoskrnl.h>
+#define NDEBUG
+#include <debug.h>
+
+/* FUNCTIONS *****************************************************************/
+
+VOID
+FASTCALL
+KiIpiSend(
+    _In_ KAFFINITY TargetSet,
+    _In_ ULONG IpiRequest)
+{
+    /* Check if we can send the IPI directly */
+    if (IpiRequest == IPI_APC)
+    {
+        HalSendSoftwareInterrupt(TargetSet, APC_LEVEL);
+    }
+    else if (IpiRequest == IPI_DPC)
+    {
+        HalSendSoftwareInterrupt(TargetSet, DISPATCH_LEVEL);
+    }
+    else if (IpiRequest == IPI_FREEZE)
+    {
+        /* On x64 the freeze IPI is an NMI */
+        HalSendNMI(TargetSet);
+    }
+    else
+    {
+        ASSERT(FALSE);
+    }
+}
+
+ULONG_PTR
+NTAPI
+KeIpiGenericCall(
+    _In_ PKIPI_BROADCAST_WORKER Function,
+    _In_ ULONG_PTR Argument)
+{
+    __debugbreak();
+    return 0;
+}
diff --git a/ntoskrnl/ke/ipi.c b/ntoskrnl/ke/ipi.c
index 841087d1daa..b81a22ac2c6 100644
--- a/ntoskrnl/ke/ipi.c
+++ b/ntoskrnl/ke/ipi.c
@@ -18,6 +18,8 @@ extern KSPIN_LOCK KiReverseStallIpiLock;
 
 /* PRIVATE FUNCTIONS *********************************************************/
 
+#ifndef _M_AMD64
+
 VOID
 NTAPI
 KiIpiGenericCallTarget(IN PKIPI_CONTEXT PacketContext,
@@ -270,3 +272,5 @@ KeIpiGenericCall(IN PKIPI_BROADCAST_WORKER Function,
     KeLowerIrql(OldIrql);
     return Status;
 }
+
+#endif // !_M_AMD64
diff --git a/ntoskrnl/ntos.cmake b/ntoskrnl/ntos.cmake
index 26a1e07b17e..473e0455966 100644
--- a/ntoskrnl/ntos.cmake
+++ b/ntoskrnl/ntos.cmake
@@ -351,6 +351,7 @@ elseif(ARCH STREQUAL "amd64")
         ${REACTOS_SOURCE_DIR}/ntoskrnl/ke/amd64/cpu.c
         ${REACTOS_SOURCE_DIR}/ntoskrnl/ke/amd64/except.c
         ${REACTOS_SOURCE_DIR}/ntoskrnl/ke/amd64/interrupt.c
+        ${REACTOS_SOURCE_DIR}/ntoskrnl/ke/amd64/ipi.c
         ${REACTOS_SOURCE_DIR}/ntoskrnl/ke/amd64/irql.c
         ${REACTOS_SOURCE_DIR}/ntoskrnl/ke/amd64/kiinit.c
         ${REACTOS_SOURCE_DIR}/ntoskrnl/ke/amd64/krnlinit.c