Is this some kind of macro in the Linux kernel code?
I found this in linux kernel code http://gitorious.org/pandroid/kernel-omap/blobs/5ed7607d45b300a37dd13ad1c79adea56f6687ce/arch/arm/mach-omap2/board-omap4panda.c
MACHINE_START(OMAP4_PANDA, "OMAP4430 Panda Board")
.phys_io = 0x48000000,
.io_pg_offst = ((0xfa000000) >> 18) & 0xfffc,
.boot_params = 0x80000100,
.map_io = omap_panda_map_io,
.init_irq = omap_panda_init_irq,
.init_machine = omap_panda_init,
.timer = &omap_timer,
MACHINE_END
I don't understand what is it? is it a macro or structure or what .. ???
definition
/*
* Set of macros to define architecture features. This is built into
* a table by the linker.
*/
#define MACHINE_START(_type,_name) \
static const struct machine_desc __mach_desc_##_type \
__used \
__attribute__((__section__(".arch.info.init"))) = { \
.nr = MACH_TYPE_##_type, \
.name = _name,
#define MACHINE_END \
};
#endif
but i don't understand how it works?
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the designated struct initialization is a GNU GCC extension that looks a little odd if you're used to ANSI C compilers. This, combined with an ambitious macro, makes it look a lot like a foreign language. Extended source code:
static const struct machine_desc __mach_desc_OMAP4_PANDA
__used __attribute__((__section__(".arch.info.init"))) = {
.nr = MACH_TYPE_OMAP4_PANDA,
.name = "OMAP4430 Panda Board",
.phys_io = 0x48000000,
.io_pg_offst = ((0xfa000000) >> 18) & 0xfffc,
.boot_params = 0x80000100,
.map_io = omap_panda_map_io,
.init_irq = omap_panda_init_irq,
.init_machine = omap_panda_init,
.timer = &omap_timer,
};
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MACHINE_START
Defined as preprocessor macro at: arch / arm / include / asm / mach / arch.h, line 67
MACHINE_END
Defined as preprocessor macro at: arch / arm / include / asm / mach / arch.h, line 74
I use this site for Linux kernel links http://lxr.free-electrons.com/
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