| /* |
| * 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 <asm/cio.h> |
| #include <asm/setup.h> |
| #include <linux/device.h> |
| #include <linux/mm.h> |
| #include <linux/kexec.h> |
| #include <linux/delay.h> |
| #include <asm/pgtable.h> |
| #include <asm/pgalloc.h> |
| #include <asm/system.h> |
| |
| static void kexec_halt_all_cpus(void *); |
| |
| typedef void (*relocate_kernel_t) (kimage_entry_t *, unsigned long); |
| |
| const extern unsigned char relocate_kernel[]; |
| const extern 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(); |
| |
| /* Disable lowcore protection */ |
| ctl_clear_bit(0,28); |
| |
| on_each_cpu(kexec_halt_all_cpus, image, 0, 0); |
| for(;;); |
| } |
| |
| 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; |
| |
| if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid)) |
| 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); |
| } |