/* * Do not allocate memory (or fail in any way) in machine_kexec(). * We are past the point of no return, committed to rebooting now. */ void machine_kexec(struct kimage *image) { unsigned long page_list[PAGES_NR]; void *control_page; int save_ftrace_enabled; asmlinkage unsigned long (*relocate_kernel_ptr)(unsigned long indirection_page, unsigned long control_page, unsigned long start_address, unsigned int has_pae, unsigned int preserve_context); #ifdef CONFIG_KEXEC_JUMP if (image->preserve_context) save_processor_state(); #endif save_ftrace_enabled = __ftrace_enabled_save(); /* Interrupts aren't acceptable while we reboot */ local_irq_disable(); if (image->preserve_context) { #ifdef CONFIG_X86_IO_APIC /* * We need to put APICs in legacy mode so that we can * get timer interrupts in second kernel. kexec/kdump * paths already have calls to disable_IO_APIC() in * one form or other. kexec jump path also need * one. */ disable_IO_APIC(); #endif } control_page = page_address(image->control_code_page); memcpy(control_page, relocate_kernel, KEXEC_CONTROL_CODE_MAX_SIZE); relocate_kernel_ptr = control_page; page_list[PA_CONTROL_PAGE] = __pa(control_page); page_list[VA_CONTROL_PAGE] = (unsigned long)control_page; page_list[PA_PGD] = __pa(image->arch.pgd); if (image->type == KEXEC_TYPE_DEFAULT) page_list[PA_SWAP_PAGE] = (page_to_pfn(image->swap_page) << PAGE_SHIFT); /* now call it */ image->start = relocate_kernel_ptr((unsigned long)image->head, (unsigned long)page_list, image->start, cpu_has_pae, image->preserve_context); #ifdef CONFIG_KEXEC_JUMP if (image->preserve_context) restore_processor_state(); #endif __ftrace_enabled_restore(save_ftrace_enabled); }
/** * suspend_devices_and_enter - suspend devices and enter the desired system * sleep state. * @state: state to enter */ int suspend_devices_and_enter(suspend_state_t state) { int error, ftrace_save; if (!suspend_ops) return -ENOSYS; if (suspend_ops->begin) { error = suspend_ops->begin(state); if (error) goto Close; } suspend_console(); ftrace_save = __ftrace_enabled_save(); suspend_test_start(); error = device_suspend(PMSG_SUSPEND); if (error) { printk(KERN_ERR "PM: Some devices failed to suspend\n"); goto Recover_platform; } suspend_test_finish("suspend devices"); if (suspend_test(TEST_DEVICES)) goto Recover_platform; if (suspend_ops->prepare) { error = suspend_ops->prepare(); if (error) goto Resume_devices; } if (suspend_test(TEST_PLATFORM)) goto Finish; error = disable_nonboot_cpus(); if (!error && !suspend_test(TEST_CPUS)) suspend_enter(state); enable_nonboot_cpus(); Finish: if (suspend_ops->finish) suspend_ops->finish(); Resume_devices: suspend_test_start(); device_resume(PMSG_RESUME); suspend_test_finish("resume devices"); __ftrace_enabled_restore(ftrace_save); resume_console(); Close: if (suspend_ops->end) suspend_ops->end(); return error; Recover_platform: if (suspend_ops->recover) suspend_ops->recover(); goto Resume_devices; }