1 files changed, 55 insertions, 0 deletions

diff --git a/arch/um/kernel/sigio.c b/arch/um/kernel/sigio.c
new file mode 100644
index 000000000000..0ad755ceb212
--- /dev/null
+++ b/arch/um/kernel/sigio.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "linux/list.h"
+#include "linux/slab.h"
+#include "linux/signal.h"
+#include "linux/interrupt.h"
+#include "init.h"
+#include "sigio.h"
+#include "irq_user.h"
+#include "irq_kern.h"
+#include "os.h"
+
+/* Protected by sigio_lock() called from write_sigio_workaround */
+static int sigio_irq_fd = -1;
+
+static irqreturn_t sigio_interrupt(int irq, void *data, struct pt_regs *unused)
+{
+        char c;
+
+        os_read_file(sigio_irq_fd, &c, sizeof(c));
+        reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
+        return(IRQ_HANDLED);
+}
+
+int write_sigio_irq(int fd)
+{
+        int err;
+
+        err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
+                             IRQF_DISABLED|IRQF_SAMPLE_RANDOM, "write sigio",
+                             NULL);
+        if(err){
+                printk("write_sigio_irq : um_request_irq failed, err = %d\n",
+                       err);
+                return(-1);
+        }
+        sigio_irq_fd = fd;
+        return(0);
+}
+
+static DEFINE_SPINLOCK(sigio_spinlock);
+
+void sigio_lock(void)
+{
+        spin_lock(&sigio_spinlock);
+}
+
+void sigio_unlock(void)
+{
+        spin_unlock(&sigio_spinlock);
+}