Started rewrite from scratch.

1 files changed, 41 insertions, 0 deletions

diff --git a/entry.cpp b/entry.cpp
new file mode 100644
index 0000000..4faca0e
--- /dev/null
+++ b/entry.cpp
@@ -0,0 +1,41 @@
+#include <stdint.h>
+#include "rcc.h"
+
+int main();
+
+// Symbols from linker script.
+extern uint32_t _data_rom;
+extern uint32_t _data_start;
+extern uint32_t _data_end;
+extern uint32_t _bss_start;
+extern uint32_t _bss_end;
+
+void __attribute__((naked)) entry() {
+	// Initialize clock.
+	rcc_init();
+	
+	// Load .data from rom image.
+	uint32_t* rp = &_data_rom;
+	uint32_t* wp = &_data_start;
+	
+	while(wp < &_data_end) {
+		*wp++ = *rp++;
+	}
+	
+	// Clear .bss.
+	wp = &_bss_start;
+	
+	while(wp < &_bss_end) {
+		*wp++ = 0;
+	}
+	
+	// Call constructors.
+	
+	// Call main().
+	main();
+	
+	// Call destructors.
+	
+	// Halt.
+	while(1);
+}