[Minios-devel] [UNIKRAFT PATCH v2 2/4] include/uk: Introduce init table

[Sharan Santhanam <sharan.santhanam@xxxxxxxxx>]

The patch introduces the interface for the inittab. The patch provides
implementation to group the init function into the respective linker
section.

Signed-off-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
---
 include/uk/init.h | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 include/uk/init.h

diff --git a/include/uk/init.h b/include/uk/init.h
new file mode 100644
index 0000000..bea4127
--- /dev/null
+++ b/include/uk/init.h
@@ -0,0 +1,98 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+#ifndef _UK_INIT_H
+#define _UK_INIT_H
+
+#include <uk/config.h>
+#include <uk/essentials.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef int (*uk_init_t)(void);
+
+#define INITTAB_STR_VAR(libname, fn, base, prio) libname ## fn ## base ## prio
+#define INITTAB_SECTION(base, prio)  .uk_inittab_ ## base ## prio
+#define INITTAB_SECTION_NAME(name) STRINGIFY(name)
+
+#define __inittab(libname, fn, base, prio)                             \
+       static  const __used __section(INITTAB_SECTION_NAME(            \
+                                       INITTAB_SECTION(base, prio))    \
+                                     )                                 \
+               uk_init_t INITTAB_STR_VAR(libname, fn, base, prio) = fn
+
+/**
+ * Define a library initialization. At this point in time some platform
+ * component may not be initialized, so it wise to initializes those component
+ * to initialized.
+ */
+#define uk_early_initcall_prio(fn, prio)  __inittab(LIBNAME, fn, 1, prio)
+/**
+ * Define a stage for platform initialization. Platform at this point read
+ * all the device and device are initialized.
+ */
+#define uk_plat_initcall_prio(fn, prio)  __inittab(LIBNAME, fn, 2, prio)
+/**
+ * Define a stage for performing library initialization. This library
+ * initialization is performed after the platform is completely initialized.
+ */
+#define uk_lib_initcall_prio(fn, prio) __inittab(LIBNAME, fn, 3, prio)
+/**
+ * Define a stage for filesystem initialization.
+ */
+#define uk_rootfs_initcall_prio(fn, prio) __inittab(LIBNAME, fn, 4, prio)
+/**
+ * Define a stage for device initialization
+ */
+#define uk_sys_initcall_prio(fn, prio) __inittab(LIBNAME, fn, 5, prio)
+/**
+ * Define a stage for application pre-initialization
+ */
+#define uk_late_initcall_prio(fn, prio)  __inittab(LIBNAME, fn, 6, prio)
+
+/**
+ * Similar interface without priority.
+ */
+#define uk_early_initcall(fn)     uk_early_initcall_prio(fn, 9)
+#define uk_plat_initcall(fn)      uk_plat_initcall_prio(fn, 9)
+#define uk_lib_initcall(fn)       uk_lib_initcall_prio(fn, 9)
+#define uk_rootfs_initcall(fn)    uk_rootfs_initcall_prio(fn, 9)
+#define uk_sys_initcall(fn)       uk_sys_initcall_prio(fn, 9)
+#define uk_late_initcall(fn)      uk_late_initcall_prio(fn, 9)
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* _UK_INIT_H */
-- 
2.7.4


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