1 /* 2 * arch/s390/kernel/machine_kexec.c 3 * 4 * Copyright IBM Corp. 2005,2006 5 * 6 * Author(s): Rolf Adelsberger, 7 * Heiko Carstens <heiko.carstens@de.ibm.com> 8 */ 9 10 #include <linux/device.h> 11 #include <linux/mm.h> 12 #include <linux/kexec.h> 13 #include <linux/delay.h> 14 #include <linux/reboot.h> 15 #include <linux/ftrace.h> 16 #include <asm/cio.h> 17 #include <asm/setup.h> 18 #include <asm/pgtable.h> 19 #include <asm/pgalloc.h> 20 #include <asm/system.h> 21 #include <asm/smp.h> 22 #include <asm/reset.h> 23 #include <asm/ipl.h> 24 25 typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long); 26 27 extern const unsigned char relocate_kernel[]; 28 extern const unsigned long long relocate_kernel_len; 29 30 int machine_kexec_prepare(struct kimage *image) 31 { 32 void *reboot_code_buffer; 33 34 /* Can't replace kernel image since it is read-only. */ 35 if (ipl_flags & IPL_NSS_VALID) 36 return -ENOSYS; 37 38 /* We don't support anything but the default image type for now. */ 39 if (image->type != KEXEC_TYPE_DEFAULT) 40 return -EINVAL; 41 42 /* Get the destination where the assembler code should be copied to.*/ 43 reboot_code_buffer = (void *) page_to_phys(image->control_code_page); 44 45 /* Then copy it */ 46 memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len); 47 return 0; 48 } 49 50 void machine_kexec_cleanup(struct kimage *image) 51 { 52 } 53 54 void machine_shutdown(void) 55 { 56 } 57 58 static void __machine_kexec(void *data) 59 { 60 relocate_kernel_t data_mover; 61 struct kimage *image = data; 62 63 pfault_fini(); 64 s390_reset_system(); 65 66 data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page); 67 68 /* Call the moving routine */ 69 (*data_mover)(&image->head, image->start); 70 for (;;); 71 } 72 73 void machine_kexec(struct kimage *image) 74 { 75 tracer_disable(); 76 smp_send_stop(); 77 smp_switch_to_ipl_cpu(__machine_kexec, image); 78 } 79