diff --git a/thermosphere/src/core_ctx.h b/thermosphere/src/core_ctx.h
index 8da5fac3a..5106f4163 100644
--- a/thermosphere/src/core_ctx.h
+++ b/thermosphere/src/core_ctx.h
@@ -17,20 +17,23 @@
 #pragma once
 #include "utils.h"
 #include "barrier.h"
+#include "execute_function.h"
 
 typedef struct CoreCtx {
-    u64 kernelArgument;             // @0x00
-    uintptr_t kernelEntrypoint;     // @0x08
-    u8 *crashStack;                 // @0x10
-    u64 scratch;                    // @0x18
-    u32 coreId;                     // @0x20
-    u8 gicInterfaceId;              // @0x24
-    bool isBootCore;                // @0x25
-    bool warmboot;                  // @0x26
+    u64 kernelArgument;                 // @0x00
+    uintptr_t kernelEntrypoint;         // @0x08
+    u8 *crashStack;                     // @0x10
+    u64 scratch;                        // @0x18
+    u32 coreId;                         // @0x20
+    u8 gicInterfaceId;                  // @0x24
+    bool isBootCore;                    // @0x25
+    bool warmboot;                      // @0x26
 
     // "Execute function"
-    void *asyncFunctionArgs;        // @0x28
-    Barrier asyncFunctionBarrier;   // @0x30
+    ExecutedFunction executedFunction;  // @0x28
+    void *executedFunctionArgs;         // @0x30
+    Barrier executedFunctionBarrier;    // @0x38
+    bool executedFunctionSync;          // @0x3C
 } CoreCtx;
 
 extern CoreCtx g_coreCtxs[4];
diff --git a/thermosphere/src/execute_function.c b/thermosphere/src/execute_function.c
new file mode 100644
index 000000000..dcf019ef5
--- /dev/null
+++ b/thermosphere/src/execute_function.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "execute_function.h"
+#include "utils.h"
+#include "core_ctx.h"
+#include "irq.h"
+
+void executeFunctionOnCores(ExecutedFunction fun, void *args, bool sync, u32 coreList)
+{
+    barrierInit(&currentCoreCtx->executedFunctionBarrier, coreList);
+    currentCoreCtx->executedFunction = fun;
+    currentCoreCtx->executedFunctionArgs = args;
+    currentCoreCtx->executedFunctionSync = sync;
+
+    generateSgiForList(ThermosphereSgi_ExecuteFunction, coreList);
+}
+
+void executeFunctionOnAllCores(ExecutedFunction fun, void *args, bool sync)
+{
+    executeFunctionOnCores(fun, args, sync, getActiveCoreMask());
+}
+
+void executeFunctionOnAllCoresButSelf(ExecutedFunction fun, void *args, bool sync)
+{
+    executeFunctionOnCores(fun, args, sync, getActiveCoreMask() & ~(BIT(currentCoreCtx->coreId)));
+}
+
+void executeFunctionInterruptHandler(u32 srcCore)
+{
+    CoreCtx *ctx = &g_coreCtxs[srcCore];
+    ctx->executedFunction(ctx->executedFunctionArgs);
+    if (ctx->executedFunctionSync) {
+        barrierWait(&ctx->executedFunctionBarrier);
+    }
+}
\ No newline at end of file
diff --git a/thermosphere/src/execute_function.h b/thermosphere/src/execute_function.h
new file mode 100644
index 000000000..202dc546c
--- /dev/null
+++ b/thermosphere/src/execute_function.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#pragma once
+
+#include "types.h"
+
+typedef void (*ExecutedFunction)(void *args);
+
+void executeFunctionOnCores(ExecutedFunction fun, void *args, bool sync, u32 coreList);
+void executeFunctionOnAllCores(ExecutedFunction fun, void *args, bool sync);
+void executeFunctionOnAllCoresButSelf(ExecutedFunction fun, void *args, bool sync);
+
+void executeFunctionInterruptHandler(u32 srcCore);
\ No newline at end of file
diff --git a/thermosphere/src/irq.c b/thermosphere/src/irq.c
index 48a09cd0f..1c207e55c 100644
--- a/thermosphere/src/irq.c
+++ b/thermosphere/src/irq.c
@@ -121,7 +121,10 @@ void initIrq(void)
     initGic();
 
     // Configure the interrupts we use here
-    configureInterrupt(0, 0, false);
+    for (u32 i = 0; i < ThermosphereSgi_Max; i++) {
+        configureInterrupt(i, 0, false);
+    }
+
     configureInterrupt(GIC_IRQID_MAINTENANCE, 0, true);
 
     recursiveSpinlockUnlockRestoreIrq(&g_irqManager.lock, flags);
@@ -136,6 +139,7 @@ void handleIrqException(ExceptionStackFrame *frame, bool isLowerEl, bool isA32)
     // Acknowledge the interrupt. Interrupt goes from pending to active.
     u32 iar = gicc->iar;
     u32 irqId = iar & 0x3FF;
+    u32 srcCore = (iar >> 12) & 7;
 
     DEBUG("Received irq %x\n", irqId);
 
@@ -146,7 +150,17 @@ void handleIrqException(ExceptionStackFrame *frame, bool isLowerEl, bool isA32)
 
     bool isGuestInterrupt = false;
 
-    // TODO: handle the interrupt if it's a host interrupt
+    switch (irqId) {
+        case ThermosphereSgi_ExecuteFunction:
+            executeFunctionInterruptHandler(srcCore);
+            break;
+        case GIC_IRQID_MAINTENANCE:
+            /* TODO */
+            break;
+        default:
+            isGuestInterrupt = true;
+            break;
+    }
 
     // Priority drop
     gicc->eoir = iar;
diff --git a/thermosphere/src/main.c b/thermosphere/src/main.c
index 1db76a20a..5666d428b 100644
--- a/thermosphere/src/main.c
+++ b/thermosphere/src/main.c
@@ -16,6 +16,11 @@
 
 extern const u8 __start__[];
 
+static void testf1(void *p)
+{
+    DEBUG("Hello from sgi 0, p=%016llx\n", p);
+}
+
 static void loadKernelViaSemihosting(void)
 {
     size_t len = 1<<20; // max len
@@ -80,6 +85,9 @@ void main(ExceptionStackFrame *frame)
     // Test
     singleStepSetNextState(frame, SingleStepState_ActivePending);
 
+    // Test
+    executeFunctionOnAllCores(testf1, (void *)0x1234567, true);
+
     /*// Test
     unmaskIrq();
     generateSgiForAll(0);*/