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 <asm/cio.h> 16 #include <asm/setup.h> 17 #include <asm/pgtable.h> 18 #include <asm/pgalloc.h> 19 #include <asm/system.h> 20 #include <asm/smp.h> 21 #include <asm/reset.h> 22 #include <asm/ipl.h> 23 24 typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long); 25 26 extern const unsigned char relocate_kernel[]; 27 extern const unsigned long long relocate_kernel_len; 28 29 int machine_kexec_prepare(struct kimage *image) 30 { 31 void *reboot_code_buffer; 32 33 /* Can't replace kernel image since it is read-only. */ 34 if (ipl_flags & IPL_NSS_VALID) 35 return -ENOSYS; 36 37 /* We don't support anything but the default image type for now. */ 38 if (image->type != KEXEC_TYPE_DEFAULT) 39 return -EINVAL; 40 41 /* Get the destination where the assembler code should be copied to.*/ 42 reboot_code_buffer = (void *) page_to_phys(image->control_code_page); 43 44 /* Then copy it */ 45 memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len); 46 return 0; 47 } 48 49 void machine_kexec_cleanup(struct kimage *image) 50 { 51 } 52 53 void machine_shutdown(void) 54 { 55 } 56 57 static void __machine_kexec(void *data) 58 { 59 relocate_kernel_t data_mover; 60 struct kimage *image = data; 61 62 pfault_fini(); 63 s390_reset_system(); 64 65 data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page); 66 67 /* Call the moving routine */ 68 (*data_mover)(&image->head, image->start); 69 for (;;); 70 } 71 72 void machine_kexec(struct kimage *image) 73 { 74 smp_send_stop(); 75 smp_switch_to_ipl_cpu(__machine_kexec, image); 76 } 77