From 8419b87c6bd7be468239d0f68155631dfb5db103 Mon Sep 17 00:00:00 2001
From: Vegard Storheil Eriksen <zyp@jvnv.net>
Date: Mon, 31 Dec 2012 13:55:56 +0100
Subject: Fixed FPU support.

Selecting proper FPU flags in build_rules and enabling FPU during startup.
---
 startup/entry.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'startup')

diff --git a/startup/entry.cpp b/startup/entry.cpp
index d7385f8..64aac37 100644
--- a/startup/entry.cpp
+++ b/startup/entry.cpp
@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include <rcc/rcc.h>
+#include <cortex_m/fpu.h>
 
 int main();
 
@@ -35,6 +36,11 @@ void __attribute__((naked)) entry() {
 		*wp++ = 0;
 	}
 	
+	// Enable FPU before calling any functions that can invoke FPU instructions.
+	#ifdef HAS_FPU
+	COPROC.CPAC |= (3 << 22) | (3 << 20);
+	#endif
+	
 	// Call constructors.
 	funcp_t* fp = &_init_array_start;
 	
-- 
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