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__arch_info_begin、__arch_info_end

lewis 1年前 (2024-04-09) 阅读数 13 #技术


MACHINE_START(NUC970, "NUC970")
.atag_offset = 0x100,
.map_io = nuc970_map_io,
.init_irq = nuc970_init_irq,
.init_machine = nuc970_init,
.init_time = nuc970_timer_init,
.restart = nuc970_restart,
MACHINE_END

源码路径:linux-3.10.x\arch\metag\include\asm\mach\arch.h


/*
* arch/arm/include/asm/mach/arch.h
*
* Copyright (C) 2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/

#ifndef __ASSEMBLY__

struct tag;
struct meminfo;
struct pt_regs;
struct smp_operations;
#ifdef CONFIG_SMP
#define smp_ops(ops) (&(ops))
#else
#define smp_ops(ops) (struct smp_operations *)NULL
#endif

struct machine_desc {
unsigned int nr; /* architecture number */
const char *name; /* architecture name */
unsigned long atag_offset; /* tagged list (relative) */
const char *const *dt_compat; /* array of device tree
* 'compatible' strings */

unsigned int nr_irqs; /* number of IRQs */

#ifdef CONFIG_ZONE_DMA
unsigned long dma_zone_size; /* size of DMA-able area */
#endif

unsigned int video_start; /* start of video RAM */
unsigned int video_end; /* end of video RAM */

unsigned char reserve_lp0 :1; /* never has lp0 */
unsigned char reserve_lp1 :1; /* never has lp1 */
unsigned char reserve_lp2 :1; /* never has lp2 */
char restart_mode; /* default restart mode */
struct smp_operations *smp; /* SMP operations */
void (*fixup)(struct tag *, char **,
struct meminfo *);
void (*reserve)(void);/* reserve mem blocks */
void (*map_io)(void);/* IO mapping function */
void (*init_early)(void);
void (*init_irq)(void);
void (*init_time)(void);
void (*init_machine)(void);
void (*init_late)(void);
#ifdef CONFIG_MULTI_IRQ_HANDLER
void (*handle_irq)(struct pt_regs *);
#endif
void (*restart)(char, const char *);
};

/*
* Current machine - only accessible during boot.
*/
extern struct machine_desc *machine_desc;

/*
* Machine type table - also only accessible during boot
*/
extern struct machine_desc __arch_info_begin[], __arch_info_end[];
#define for_each_machine_desc(p) \
for (p = __arch_info_begin; p < __arch_info_end; p++)


/*
---------------------20181114 23:33---------------------------------
刚开始没有搞懂.arch.info.init与__arch_info_begin、__arch_info_end的关系,其实是
.arch.info.init在__arch_info_begin、__arch_info_end定义的范围内

在system.map文件中有如下定义

c043ece4 T __arch_info_begin
c043ece4 t __mach_desc_NUC970 //MACHINE_START(NUC970, "NUC970")生成的
c043ece4 T __proc_info_end
c043ed2c T __arch_info_end



*/



/*
* 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 \
};

#define DT_MACHINE_START(_name, _namestr) \
static const struct machine_desc __mach_desc_##_name \
__used \
__attribute__((__section__(".arch.info.init"))) = { \
.nr = ~0, \
.name = _namestr,

#endif

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