1 /* 2 * PPC32 code to handle Linux booting another kernel. 3 * 4 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> 5 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz 6 * Copyright (C) 2005 IBM Corporation. 7 * 8 * This source code is licensed under the GNU General Public License, 9 * Version 2. See the file COPYING for more details. 10 */ 11 12 #include <linux/kexec.h> 13 #include <linux/mm.h> 14 #include <linux/string.h> 15 #include <asm/cacheflush.h> 16 #include <asm/hw_irq.h> 17 #include <asm/io.h> 18 19 typedef void (*relocate_new_kernel_t)( 20 unsigned long indirection_page, 21 unsigned long reboot_code_buffer, 22 unsigned long start_address) __noreturn; 23 24 /* 25 * This is a generic machine_kexec function suitable at least for 26 * non-OpenFirmware embedded platforms. 27 * It merely copies the image relocation code to the control page and 28 * jumps to it. 29 * A platform specific function may just call this one. 30 */ default_machine_kexec(struct kimage * image)31void default_machine_kexec(struct kimage *image) 32 { 33 extern const unsigned char relocate_new_kernel[]; 34 extern const unsigned int relocate_new_kernel_size; 35 unsigned long page_list; 36 unsigned long reboot_code_buffer, reboot_code_buffer_phys; 37 relocate_new_kernel_t rnk; 38 39 /* Interrupts aren't acceptable while we reboot */ 40 local_irq_disable(); 41 42 /* mask each interrupt so we are in a more sane state for the 43 * kexec kernel */ 44 machine_kexec_mask_interrupts(); 45 46 page_list = image->head; 47 48 /* we need both effective and real address here */ 49 reboot_code_buffer = 50 (unsigned long)page_address(image->control_code_page); 51 reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer); 52 53 /* copy our kernel relocation code to the control code page */ 54 memcpy((void *)reboot_code_buffer, relocate_new_kernel, 55 relocate_new_kernel_size); 56 57 flush_icache_range(reboot_code_buffer, 58 reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); 59 printk(KERN_INFO "Bye!\n"); 60 61 /* now call it */ 62 rnk = (relocate_new_kernel_t) reboot_code_buffer; 63 (*rnk)(page_list, reboot_code_buffer_phys, image->start); 64 } 65 default_machine_kexec_prepare(struct kimage * image)66int default_machine_kexec_prepare(struct kimage *image) 67 { 68 return 0; 69 } 70
