Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / examples / standalone / interrupt.c

diff --git a/qemu/roms/u-boot/examples/standalone/interrupt.c b/qemu/roms/u-boot/examples/standalone/interrupt.c
new file mode 100644 (file)
index 0000000..6e00860
--- /dev/null
+++ b/qemu/roms/u-boot/examples/standalone/interrupt.c
@@ -0,0 +1,65 @@
+/*
+ * (C) Copyright 2006
+ * Detlev Zundel, DENX Software Engineering, dzu@denx.de.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ *
+ * This is a very simple standalone application demonstrating
+ * catching IRQs on the MPC52xx architecture.
+ *
+ * The interrupt to be intercepted can be specified as an argument
+ * to the application.  Specifying nothing will intercept IRQ1 on the
+ * MPC5200 platform.  On the CR825 carrier board from MicroSys this
+ * maps to the ABORT switch :)
+ *
+ * Note that the specified vector is only a logical number specified
+ * by the respective header file.
+ */
+
+#include <common.h>
+#include <exports.h>
+#include <config.h>
+
+#if defined(CONFIG_MPC5xxx)
+#define DFL_IRQ MPC5XXX_IRQ1
+#else
+#define DFL_IRQ 0
+#endif
+
+static void irq_handler (void *arg);
+
+int interrupt (int argc, char * const argv[])
+{
+       int c, irq = -1;
+
+       app_startup (argv);
+
+       if (argc > 1)
+               irq = simple_strtoul (argv[1], NULL, 0);
+       if ((irq < 0) || (irq > NR_IRQS))
+               irq = DFL_IRQ;
+
+       printf ("Installing handler for irq vector %d and doing busy wait\n",
+               irq);
+       printf ("Press 'q' to quit\n");
+
+       /* Install interrupt handler */
+       install_hdlr (irq, irq_handler, NULL);
+       while ((c = getc ()) != 'q') {
+               printf ("Ok, ok, I am still alive!\n");
+       }
+
+       free_hdlr (irq);
+       printf ("\nInterrupt handler has been uninstalled\n");
+
+       return (0);
+}
+
+/*
+ * Handler for interrupt
+ */
+static void irq_handler (void *arg)
+{
+       /* just for demonstration */
+       printf ("+");
+}