diff --git a/sdk/xtdk/amd64/hltypes.h b/sdk/xtdk/amd64/hltypes.h
index 4c57ae2..92fd90f 100644
--- a/sdk/xtdk/amd64/hltypes.h
+++ b/sdk/xtdk/amd64/hltypes.h
@@ -51,6 +51,12 @@
 #define APIC_DM_INIT                                    0x00000500
 #define APIC_DM_STARTUP                                 0x00000600
 #define APIC_DM_EXTINT                                  0x00000700
+#define APIC_DM_ASSERT                                  0x00004000
+#define APIC_DM_LEVEL                                   0x00008000
+#define APIC_DM_BROADCAST                               0x00080000
+
+/* APIC delivery status */
+#define APIC_DELIVERY_PENDING                           0x00001000
 
 /* APIC trigger modes */
 #define APIC_TGM_EDGE                                   0
diff --git a/sdk/xtdk/i686/hltypes.h b/sdk/xtdk/i686/hltypes.h
index 440976b..defdfc6 100644
--- a/sdk/xtdk/i686/hltypes.h
+++ b/sdk/xtdk/i686/hltypes.h
@@ -56,6 +56,12 @@
 #define APIC_DM_INIT                                    0x00000500
 #define APIC_DM_STARTUP                                 0x00000600
 #define APIC_DM_EXTINT                                  0x00000700
+#define APIC_DM_ASSERT                                  0x00004000
+#define APIC_DM_LEVEL                                   0x00008000
+#define APIC_DM_BROADCAST                               0x00080000
+
+/* APIC delivery status */
+#define APIC_DELIVERY_PENDING                           0x00001000
 
 /* APIC trigger modes */
 #define APIC_TGM_EDGE                                   0
diff --git a/xtoskrnl/hl/x86/cpu.c b/xtoskrnl/hl/x86/cpu.c
index 65f321f..7aff72d 100644
--- a/xtoskrnl/hl/x86/cpu.c
+++ b/xtoskrnl/hl/x86/cpu.c
@@ -45,3 +45,36 @@ HlInitializeProcessor(VOID)
     /* Set the APIC running level */
     HlSetRunLevel(KeGetCurrentProcessorBlock()->RunLevel);
 }
+
+XTAPI
+XTSTATUS
+HlStartProcessor(IN ULONG CpuId,
+                 IN PHYSICAL_ADDRESS EntryPoint)
+{
+    ULONG Attempt;
+
+    /* Wait until command register is clear */
+    while((HlReadApicRegister(APIC_ICR0) & APIC_DELIVERY_PENDING) != 0);
+
+    /* Trigger INIT IPI and wait for delivery bit to be cleared */
+    HlpSendIpi(CpuId, APIC_DM_INIT | APIC_DM_LEVEL | APIC_DM_ASSERT);
+    while((HlReadApicRegister(APIC_ICR0) & APIC_DELIVERY_PENDING) != 0);
+
+    /* Deassert INIT IPI to take CPU out of reset and wait for delivery bit to be cleared */
+    HlpSendIpi(CpuId, APIC_DM_INIT | APIC_DM_LEVEL);
+    while((HlReadApicRegister(APIC_ICR0) & APIC_DELIVERY_PENDING) != 0);
+
+    /* Two attempts to send STARTUP IPI */
+    for(Attempt = 0; Attempt < 2; Attempt++)
+    {
+        /* Trigger STARTUP IPI and wait for delivery bit to be cleared */
+        HlpSendIpi(CpuId, APIC_DM_STARTUP | (EntryPoint.LowPart >> 12));
+        while((HlReadApicRegister(APIC_ICR0) & APIC_DELIVERY_PENDING) != 0);
+    }
+
+    /* Memory barrier */
+    ArMemoryBarrier();
+
+    /* Return success */
+    return STATUS_SUCCESS;
+}
diff --git a/xtoskrnl/includes/amd64/ari.h b/xtoskrnl/includes/amd64/ari.h
index 1b63daa..7e9a1b2 100644
--- a/xtoskrnl/includes/amd64/ari.h
+++ b/xtoskrnl/includes/amd64/ari.h
@@ -117,6 +117,10 @@ XTCDECL
 VOID
 ArSetInterruptFlag(VOID);
 
+XTCDECL
+VOID
+ArStartApplicationProcessor();
+
 XTCDECL
 VOID
 ArStoreGlobalDescriptorTable(OUT PVOID Destination);
diff --git a/xtoskrnl/includes/i686/ari.h b/xtoskrnl/includes/i686/ari.h
index 377e7f3..5009b76 100644
--- a/xtoskrnl/includes/i686/ari.h
+++ b/xtoskrnl/includes/i686/ari.h
@@ -113,6 +113,10 @@ XTCDECL
 VOID
 ArSetInterruptFlag(VOID);
 
+XTCDECL
+VOID
+ArStartApplicationProcessor();
+
 XTCDECL
 VOID
 ArStoreGlobalDescriptorTable(OUT PVOID Destination);