浅析armlinux-setup_arch()->setup_machine(machine_arch_type)函数2
文章来源:http://gliethttp.cublog.cn
建议首先参考《浅析armlinux2_4_19启动程序[head-armv.s文件]》[http://gliethttp.cublog.cn]
//1.arch/arm/kernel/Setup.c->setup_machine() //include/asm-arm/Mach-types.h->#define machine_arch_type __machine_arch_type //setup_machine(machine_arch_type) //而__machine_arch_type在head-armv.s被赋值 //__machine_arch_type=r1=由bootloader直接传入[u-boot1.1.5]=251 static struct machine_desc * __init setup_machine(unsigned int nr) {extern struct machine_desc __arch_info_begin, __arch_info_end; struct machine_desc *list; //++++++++++++++ //processor_id=0x41129200;赋值于arch/arm/kernel/head-armv.s文件[gliethttp] //__proc_info_begin和__proc_info_end在编译链接脚本arch/arm/vmlinux-armv.lds.in中定义 //... //__arch_info_begin = .; //*(.arch.info) //__arch_info_end = .; //... //-------------- //++++++++++++++ //arch/arm/mach-at91rm9200/Core.c //位于.arch.info段 //MACHINE_START(AT91RM9200, "ATMEL AT91RM9200")//.nr = MACH_TYPE_##_type=MACH_TYPE_AT91RM9200=251 //与上面从u-boot传到r1中的一样[gliethttp] //MAINTAINER("SAN People / ATMEL") //BOOT_MEM(AT91_SDRAM_BASE, AT91C_BASE_SYS, AT91C_VA_BASE_SYS) //BOOT_PARAMS(AT91_SDRAM_BASE + 0x100)//tag list存放的物理地址0x20000100[gliethttp] //FIXUP(at91rm9200_fixup) //MAPIO(at91rm9200_map_io) //INITIRQ(at91rm9200_init_irq) //MACHINE_END[gliethttp] //-------------- for (list = &__arch_info_begin; list < &__arch_info_end; list++) if (list->nr == nr)//匹配没问题 break; //没有匹配上,打印提示,halt系统 if (list >= &__arch_info_end) { printk("Architecture configuration botched (nr %d), unable " "to continue.\n", nr); while (1); } printk("Machine: %s\n", list->name); return list;//返回匹配的machine_desc结构指针 }
|