Port module initialization macros and initcall redefinition macros from
Linux
Signed-off-by: David Dgien <dgienda125@xxxxxxxxx>
---
include/init.h | 26 ++++++++++++------
include/module.h | 71 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 88 insertions(+), 9 deletions(-)
diff --git a/include/init.h b/include/init.h
index d1cef14b0..2d61bc896 100644
--- a/include/init.h
+++ b/include/init.h
@@ -18,6 +18,21 @@
typedef int (*initcall_t)(void);
typedef void (*exitcall_t)(void);
+/* section for code used very early when
+ * - we're not running from where we linked at
+ * - bss not cleared
+ * - static variables not initialized
+ *
+ * Mainly useful for booting from NAND Controllers
+ */
+#define __bare_init __section(.text_bare_init.text)
+
+#endif
+
+#ifndef MODULE
+
+#ifndef __ASSEMBLY__
+
#define __define_initcall(level,fn,id) \
static initcall_t __initcall_##fn##id __attribute__((__used__)) \
__attribute__((__section__(".initcall." level))) = fn
@@ -58,16 +73,9 @@ typedef void (*exitcall_t)(void);
#define archshutdown_exitcall(fn) __define_exitcall("5",fn,5)
#define postarchshutdown_exitcall(fn) __define_exitcall("6",fn,6)
-/* section for code used very early when
- * - we're not running from where we linked at
- * - bss not cleared
- * - static variables not initialized
- *
- * Mainly useful for booting from NAND Controllers
- */
-#define __bare_init __section(.text_bare_init.text)
+#endif /* __ASSEMBLY__ */
-#endif
+#endif /* MODULE */
#endif /* _INIT_H */
diff --git a/include/module.h b/include/module.h
index cea8c2e18..f416cd0ae 100644
--- a/include/module.h
+++ b/include/module.h
@@ -2,6 +2,7 @@
#ifndef __MODULE_H
#define __MODULE_H
+#include <init.h>
#include <elf.h>
#include <linux/compiler.h>
#include <linux/export.h>
@@ -13,6 +14,76 @@
#define MODULE_NAME_LEN (64 - sizeof(unsigned long))
+/* These are either module local, or the kernel's dummy ones. */
+extern int init_module(void);
+extern void cleanup_module(void);
+
+#ifndef MODULE
+/**
+ * module_init() - driver initialization entry point
+ * @x: function to be run at kernel boot time or module insertion
+ *
+ * module_init() will either be called during do_initcalls() (if
+ * builtin) or at module insertion time (if a module). There can only
+ * be one per module.
+ */
+#define module_init(x) device_initcall(x);
+
+/**
+ * module_exit() - driver exit entry point
+ * @x: function to be run when driver is removed
+ *
+ * module_exit() will wrap the driver clean-up code
+ * with cleanup_module() when used with rmmod when
+ * the driver is a module. If the driver is statically
+ * compiled into the kernel, module_exit() has no effect.
+ * There can only be one per module.
+ */
+#define module_exit(x) devshutdown_exitcall(x);
+
+#else /* MODULE */
+
+/*
+ * In most cases loadable modules do not need custom
+ * initcall levels. There are still some valid cases where
+ * a driver may be needed early if built in, and does not
+ * matter when built as a loadable module. Like bus
+ * snooping debug drivers.
+ */
+#define core_initcall(fn) module_init(fn)
+#define postcore_initcall(fn) module_init(fn)
+#define console_initcall(fn) module_init(fn)
+#define postconsole_initcall(fn) module_init(fn)
+#define mem_initcall(fn) module_init(fn)
+#define mmu_initcall(fn) module_init(fn)
+#define postmmu_initcall(fn) module_init(fn)
+#define coredevice_initcall(fn) module_init(fn)
+#define fs_initcall(fn) module_init(fn)
+#define device_initcall(fn) module_init(fn)
+#define late_initcall(fn) module_init(fn)
+
+#define early_exitcall(fn) module_exit(fn)
+#define predevshutdown_exitcall(fn) module_exit(fn)
+#define devshutdown_exitcall(fn) module_exit(fn)
+#define postdevshutdown_exitcall(fn) module_exit(fn)
+#define prearchshutdown_exitcall(fn) module_exit(fn)
+#define archshutdown_exitcall(fn) module_exit(fn)
+#define postarchshutdown_exitcall(fn) module_exit(fn)
+
+/* Each module must use one module_init(). */
+#define module_init(initfn) \
+ static inline initcall_t __maybe_unused __inittest(void) \
+ { return initfn; } \
+ int init_module(void) __attribute__((alias(#initfn)));
+
+/* This is only required if you want to be unloadable. */
+#define module_exit(exitfn) \
+ static inline exitcall_t __maybe_unused __exittest(void) \
+ { return exitfn; } \
+ void cleanup_module(void) __attribute__((alias(#exitfn)));
+
+#endif
+
#ifdef CONFIG_MODULES
#include <asm/module.h>
--
2.27.0
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