1 files changed, 55 insertions, 0 deletions
diff --git a/kern/xcall.h b/kern/xcall.h
new file mode 100644
index 00000000..37c85867
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+++ b/kern/xcall.h
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+/*
+ * Copyright (c) 2014 Richard Braun.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Cross-processor function calls.
+ *
+ * This module provides the ability to run functions, called cross-calls,
+ * on specific processors.
+ */
+
+#ifndef _KERN_XCALL_H
+#define _KERN_XCALL_H
+
+/*
+ * Type for cross-call functions.
+ */
+typedef void (*xcall_fn_t)(void *arg);
+
+/*
+ * Initialize the xcall module.
+ */
+void xcall_setup(void);
+
+/*
+ * Run the given cross-call function on a specific processor.
+ *
+ * The operation is completely synchronous, returning only when the function
+ * has finished running on the target processor, with the side effects of
+ * the function visible.
+ *
+ * The function is run in interrupt context.
+ */
+void xcall_call(xcall_fn_t fn, void *arg, unsigned int cpu);
+
+/*
+ * Report a cross-call interrupt from a remote processor.
+ *
+ * Called from interrupt context.
+ */
+void xcall_intr(void);
+
+#endif /* _KERN_XCALL_H */