Reorganize repository structure

lpctool/irq.c

@@ -0,0 +1,43 @@
+#include "lpc2220.hh"
+#include "irq.h"
+
+#define IRQ_MASK 0x00000080
+
+static inline unsigned asm_get_cpsr(void)
+{
+  unsigned long retval;
+  asm volatile (" mrs  %0, cpsr" : "=r" (retval) : /* no inputs */  );
+  return retval;
+}
+
+static inline void asm_set_cpsr(unsigned val)
+{
+  asm volatile (" msr  cpsr, %0" : /* no outputs */ : "r" (val)  );
+}
+
+unsigned enableIRQ(void)
+{
+  unsigned _cpsr;
+
+  _cpsr = asm_get_cpsr();
+  asm_set_cpsr(_cpsr & ~IRQ_MASK);
+  return _cpsr;
+}
+
+unsigned disableIRQ(void)
+{
+  unsigned _cpsr;
+
+  _cpsr = asm_get_cpsr();
+  asm_set_cpsr(_cpsr | IRQ_MASK);
+  return _cpsr;
+}
+
+unsigned restoreIRQ(unsigned oldCPSR)
+{
+  unsigned _cpsr;
+
+  _cpsr = asm_get_cpsr();
+  asm_set_cpsr((_cpsr & ~IRQ_MASK) | (oldCPSR & IRQ_MASK));
+  return _cpsr;
+}