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-rw-r--r--arch/um/kernel/sigio_kern.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/um/kernel/sigio_kern.c b/arch/um/kernel/sigio_kern.c
new file mode 100644
index 0000000..2299884
--- /dev/null
+++ b/arch/um/kernel/sigio_kern.c
@@ -0,0 +1,63 @@
+/*
+ * 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"
+
+/* 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)
+{
+ read_sigio_fd(sigio_irq_fd);
+ 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,
+ SA_INTERRUPT | SA_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);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
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