Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / m68k / lib / interrupts.c

diff --git a/qemu/roms/u-boot/arch/m68k/lib/interrupts.c b/qemu/roms/u-boot/arch/m68k/lib/interrupts.c
new file mode 100644 (file)
index 0000000..b96df60
--- /dev/null
+++ b/qemu/roms/u-boot/arch/m68k/lib/interrupts.c
@@ -0,0 +1,99 @@
+/*
+ * (C) Copyright 2000-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2007 Freescale Semiconductor Inc
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <asm/processor.h>
+#include <asm/immap.h>
+
+#define        NR_IRQS         (CONFIG_SYS_NUM_IRQS)
+
+/*
+ * Interrupt vector functions.
+ */
+struct interrupt_action {
+       interrupt_handler_t *handler;
+       void *arg;
+};
+
+static struct interrupt_action irq_vecs[NR_IRQS];
+
+static __inline__ unsigned short get_sr (void)
+{
+       unsigned short sr;
+
+       asm volatile ("move.w %%sr,%0":"=r" (sr):);
+
+       return sr;
+}
+
+static __inline__ void set_sr (unsigned short sr)
+{
+       asm volatile ("move.w %0,%%sr"::"r" (sr));
+}
+
+/************************************************************************/
+/*
+ * Install and free an interrupt handler
+ */
+void irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
+{
+       if ((vec < 0) || (vec >= NR_IRQS)) {
+               printf ("irq_install_handler: wrong interrupt vector %d\n",
+                       vec);
+               return;
+       }
+
+       irq_vecs[vec].handler = handler;
+       irq_vecs[vec].arg = arg;
+}
+
+void irq_free_handler (int vec)
+{
+       if ((vec < 0) || (vec >= NR_IRQS)) {
+               return;
+       }
+
+       irq_vecs[vec].handler = NULL;
+       irq_vecs[vec].arg = NULL;
+}
+
+void enable_interrupts (void)
+{
+       unsigned short sr;
+
+       sr = get_sr ();
+       set_sr (sr & ~0x0700);
+}
+
+int disable_interrupts (void)
+{
+       unsigned short sr;
+
+       sr = get_sr ();
+       set_sr (sr | 0x0700);
+
+       return ((sr & 0x0700) == 0);    /* return true, if interrupts were enabled before */
+}
+
+void int_handler (struct pt_regs *fp)
+{
+       int vec;
+
+       vec = (fp->vector >> 2) & 0xff;
+       if (vec > 0x40)
+               vec -= 0x40;
+
+       if (irq_vecs[vec].handler != NULL) {
+               irq_vecs[vec].handler (irq_vecs[vec].arg);
+       } else {
+               printf ("\nBogus External Interrupt Vector %d\n", vec);
+       }
+}