新路程------hi3516a的reboot过程

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最近做watchdog，发现系统没有reboot成功，于是追一下正常的reboot是怎么做的

void hi3516a_restart(char mode, const char *cmd){__raw_writel(~0, IO_ADDRESS(SYS_CTRL_BASE) + REG_SC_SYSRES);}/*****************************************************************************/extern struct sys_timer hi3516a_sys_timer;MACHINE_START(HI3516A, "hi3516a").atag_offset= 0x100,.map_io= hi3516a_map_io,.init_early= hi3516a_init_early,.init_irq= hi3516a_gic_init_irq,.handle_irq= gic_handle_irq,.timer= &hi3516a_sys_timer,.init_machine= hi3516a_init,.reserve= hi3516a_reserve,.restart= hi3516a_restart,MACHINE_END

然后是

arch/arm/setup.c

void __init setup_arch(char **cmdline_p){struct machine_desc *mdesc;setup_processor();mdesc = setup_machine_fdt(__atags_pointer);if (!mdesc)mdesc = setup_machine_tags(machine_arch_type);machine_desc = mdesc;machine_name = mdesc->name;#ifdef CONFIG_ZONE_DMAif (mdesc->dma_zone_size) {extern unsigned long arm_dma_zone_size;arm_dma_zone_size = mdesc->dma_zone_size;}#endifif (mdesc->restart_mode)reboot_setup(&mdesc->restart_mode);init_mm.start_code = (unsigned long) _text;init_mm.end_code   = (unsigned long) _etext;init_mm.end_data   = (unsigned long) _edata;init_mm.brk   = (unsigned long) _end;/* populate cmd_line too for later use, preserving boot_command_line */strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);*cmdline_p = cmd_line;parse_early_param();sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);sanity_check_meminfo();arm_memblock_init(&meminfo, mdesc);paging_init(mdesc);request_standard_resources(mdesc);if (mdesc->restart)arm_pm_restart = mdesc->restart;   //hereunflatten_device_tree();#ifdef CONFIG_SMPif (is_smp())smp_init_cpus();#endifreserve_crashkernel();tcm_init();#ifdef CONFIG_MULTI_IRQ_HANDLERhandle_arch_irq = mdesc->handle_irq;#endif#ifdef CONFIG_VT#if defined(CONFIG_VGA_CONSOLE)conswitchp = &vga_con;#elif defined(CONFIG_DUMMY_CONSOLE)conswitchp = &dummy_con;#endif#endifif (mdesc->init_early)mdesc->init_early();}

最后是

arch/arm/kernel/process.c

void machine_restart(char *cmd){printk("matt-process.c\n");machine_shutdown();/* Flush the console to make sure all the relevant messages make it * out to the console drivers */arm_machine_flush_console();arm_pm_restart(reboot_mode, cmd);  //this/* Give a grace period for failure to restart of 1s */mdelay(1000);/* Whoops - the platform was unable to reboot. Tell the user! */printk("Reboot failed -- System halted\n");local_irq_disable();while (1);}

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