1 files changed, 54 insertions, 0 deletions
diff --git a/linux/src/kernel/softirq.c b/linux/src/kernel/softirq.c
new file mode 100644
index 0000000..022b553
--- /dev/null
+++ b/linux/src/kernel/softirq.c
@@ -0,0 +1,54 @@
+/*
+ *	linux/kernel/softirq.c
+ *
+ *	Copyright (C) 1992 Linus Torvalds
+ *
+ * do_bottom_half() runs at normal kernel priority: all interrupts
+ * enabled.  do_bottom_half() is atomic with respect to itself: a
+ * bottom_half handler need not be re-entrant.
+ */
+
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/kernel_stat.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/bitops.h>
+
+unsigned long intr_count = 0;
+
+int bh_mask_count[32];
+unsigned long bh_active = 0;
+unsigned long bh_mask = 0;
+void (*bh_base[32])(void);
+
+
+asmlinkage void do_bottom_half(void)
+{
+	unsigned long active;
+	unsigned long mask, left;
+	void (**bh)(void);
+
+	sti();
+	bh = bh_base;
+	active = bh_active & bh_mask;
+	for (mask = 1, left = ~0 ; left & active ; bh++,mask += mask,left += left) {
+		if (mask & active) {
+			void (*fn)(void);
+			bh_active &= ~mask;
+			fn = *bh;
+			if (!fn)
+				goto bad_bh;
+			fn();
+		}
+	}
+	return;
+bad_bh:
+	printk ("irq.c:bad bottom half entry %08lx\n", mask);
+}