| 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 NORET_TYPE void (*relocate_new_kernel_t)( |
| 20 | unsigned long indirection_page, |
| 21 | unsigned long reboot_code_buffer, |
| 22 | unsigned long start_address) ATTRIB_NORET; |
| 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 | */ |
| 31 | void 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 | page_list = image->head; |
| 43 | |
| 44 | /* we need both effective and real address here */ |
| 45 | reboot_code_buffer = |
| 46 | (unsigned long)page_address(image->control_code_page); |
| 47 | reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer); |
| 48 | |
| 49 | /* copy our kernel relocation code to the control code page */ |
| 50 | memcpy((void *)reboot_code_buffer, relocate_new_kernel, |
| 51 | relocate_new_kernel_size); |
| 52 | |
| 53 | flush_icache_range(reboot_code_buffer, |
| 54 | reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE); |
| 55 | printk(KERN_INFO "Bye!\n"); |
| 56 | |
| 57 | /* now call it */ |
| 58 | rnk = (relocate_new_kernel_t) reboot_code_buffer; |
| 59 | (*rnk)(page_list, reboot_code_buffer_phys, image->start); |
| 60 | } |
| 61 | |
| 62 | int default_machine_kexec_prepare(struct kimage *image) |
| 63 | { |
| 64 | return 0; |
| 65 | } |