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/*
* Copyright (c) 2010-2017 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/>.
*
*
* Init sections and operations.
*/
#ifndef KERN_INIT_H
#define KERN_INIT_H
/*
* These sections should contain code and data which can be discarded once
* kernel initialization is done.
*/
#define INIT_SECTION .init.text
#define INIT_DATA_SECTION .init.data
/*
* This section must only contain init operation structures, and must be
* located inside the .init section.
*/
#define INIT_OPS_SECTION .init.ops
/*
* Alignment is important to make sure initialization operations are
* stored as a C array in the reserved init op section.
*/
#define INIT_OP_ALIGN 64
#ifndef __ASSEMBLER__
#include <errno.h>
#include <kern/macros.h>
#define __init __section(QUOTE(INIT_SECTION))
#define __initdata __section(QUOTE(INIT_DATA_SECTION))
/*
* Boundaries of the .init section.
*/
extern char _init;
extern char _init_end;
/*
* Type for initialization operation functions.
*/
typedef int (*init_op_fn_t)(void);
#include <kern/init_i.h>
/*
* Forge an init operation declaration.
*/
#define INIT_OP_DECLARE(fn) extern struct init_op INIT_OP(fn)
/*
* Foge an entry suitable as an init operation dependency.
*
* If a dependency isn't required, it's still used to determine run
* order, but its result is ignored, and the operation depending on it
* behaves as if that dependency succeeded.
*/
#define INIT_OP_DEP(fn, required) { &INIT_OP(fn), required }
/*
* Init operation definition macro.
*
* This macro is used to define a structure named after the given function.
* Init operations are placed in a specific section which doesn't contain
* any other object type, making it a system-wide array of init operations.
* There is no need to actively register init operations; this module finds
* them all from their section. Dependencies are given as a variable-length
* argument list of entries built with the INIT_OP_DEP() macro.
*/
#define INIT_OP_DEFINE(_fn, ...) \
static struct init_op_dep INIT_OP_DEPS(_fn)[] __initdata = { \
__VA_ARGS__ \
}; \
\
struct init_op INIT_OP(_fn) __initop __used = { \
.name = QUOTE(_fn), \
.fn = _fn, \
.deps = INIT_OP_DEPS(_fn), \
.error = EAGAIN, \
.state = INIT_OP_STATE_UNLINKED, \
.nr_deps = ARRAY_SIZE(INIT_OP_DEPS(_fn)), \
.nr_parents = 0, \
}
/*
* Initialize the init module.
*
* Scan the section containing init operations, resolve all dependencies,
* and run operations in an appropriate order.
*/
void init_setup(void);
#endif /* __ASSEMBLER__ */
#endif /* KERN_INIT_H */
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