/* * arch/s390/kernel/machine_kexec.c * * (C) Copyright IBM Corp. 2005 * * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com> * */ /* * s390_machine_kexec.c - handle the transition of Linux booting another kernel * on the S390 architecture. */ #include <linux/device.h> #include <linux/mm.h> #include <linux/kexec.h> #include <linux/delay.h> #include <asm/cio.h> #include <asm/setup.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/system.h> #include <asm/smp.h> static void kexec_halt_all_cpus(void *); typedef void (*relocate_kernel_t) (kimage_entry_t *, unsigned long); extern const unsigned char relocate_kernel[]; extern const unsigned long long relocate_kernel_len; int machine_kexec_prepare(struct kimage *image) { unsigned long reboot_code_buffer; /* We don't support anything but the default image type for now. */ if (image->type != KEXEC_TYPE_DEFAULT) return -EINVAL; /* Get the destination where the assembler code should be copied to.*/ reboot_code_buffer = page_to_pfn(image->control_code_page)<<PAGE_SHIFT; /* Then copy it */ memcpy((void *) reboot_code_buffer, relocate_kernel, relocate_kernel_len); return 0; } void machine_kexec_cleanup(struct kimage *image) { } void machine_shutdown(void) { printk(KERN_INFO "kexec: machine_shutdown called\n"); } NORET_TYPE void machine_kexec(struct kimage *image) { clear_all_subchannels(); cio_reset_channel_paths(); /* Disable lowcore protection */ ctl_clear_bit(0,28); on_each_cpu(kexec_halt_all_cpus, image, 0, 0); for (;;); } extern void pfault_fini(void); static void kexec_halt_all_cpus(void *kernel_image) { static atomic_t cpuid = ATOMIC_INIT(-1); int cpu; struct kimage *image; relocate_kernel_t data_mover; #ifdef CONFIG_PFAULT if (MACHINE_IS_VM) pfault_fini(); #endif if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1) signal_processor(smp_processor_id(), sigp_stop); /* Wait for all other cpus to enter stopped state */ for_each_online_cpu(cpu) { if (cpu == smp_processor_id()) continue; while (!smp_cpu_not_running(cpu)) cpu_relax(); } image = (struct kimage *) kernel_image; data_mover = (relocate_kernel_t) (page_to_pfn(image->control_code_page) << PAGE_SHIFT); /* Call the moving routine */ (*data_mover) (&image->head, image->start); }