From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-qk1-x741.google.com ([2607:f8b0:4864:20::741]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jq4NX-0007jE-RP for barebox@lists.infradead.org; Tue, 30 Jun 2020 00:44:04 +0000 Received: by mail-qk1-x741.google.com with SMTP id b185so6505751qkg.1 for ; Mon, 29 Jun 2020 17:44:03 -0700 (PDT) From: David Dgien Date: Mon, 29 Jun 2020 20:38:32 -0400 Message-Id: <20200630003838.7745-3-dgienda125@gmail.com> In-Reply-To: <20200630003838.7745-1-dgienda125@gmail.com> References: <20200630003838.7745-1-dgienda125@gmail.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH v2 2/8] module: Add init macros to module.h To: barebox@lists.infradead.org Cc: David Dgien Port module initialization macros and initcall redefinition macros from Linux Signed-off-by: David Dgien --- 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 #include #include #include @@ -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 -- 2.27.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox