kogiidena | 9d44190 | 2006-01-16 22:14:10 -0800 | [diff] [blame] | 1 | /* |
| 2 | * machine_kexec.c - handle transition of Linux booting another kernel |
| 3 | * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> |
| 4 | * |
| 5 | * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz |
| 6 | * LANDISK/sh4 supported by kogiidena |
| 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/mm.h> |
| 13 | #include <linux/kexec.h> |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/reboot.h> |
| 16 | #include <asm/pgtable.h> |
| 17 | #include <asm/pgalloc.h> |
| 18 | #include <asm/mmu_context.h> |
| 19 | #include <asm/io.h> |
| 20 | #include <asm/cacheflush.h> |
| 21 | |
| 22 | typedef NORET_TYPE void (*relocate_new_kernel_t)( |
| 23 | unsigned long indirection_page, |
| 24 | unsigned long reboot_code_buffer, |
| 25 | unsigned long start_address, |
| 26 | unsigned long vbr_reg) ATTRIB_NORET; |
| 27 | |
Tobias Klauser | 2efe55a | 2006-06-26 18:57:34 +0200 | [diff] [blame] | 28 | extern const unsigned char relocate_new_kernel[]; |
| 29 | extern const unsigned int relocate_new_kernel_size; |
kogiidena | 9d44190 | 2006-01-16 22:14:10 -0800 | [diff] [blame] | 30 | extern void *gdb_vbr_vector; |
| 31 | |
kogiidena | 9d44190 | 2006-01-16 22:14:10 -0800 | [diff] [blame] | 32 | void machine_shutdown(void) |
| 33 | { |
| 34 | } |
| 35 | |
| 36 | void machine_crash_shutdown(struct pt_regs *regs) |
| 37 | { |
| 38 | } |
| 39 | |
| 40 | /* |
| 41 | * Do what every setup is needed on image and the |
| 42 | * reboot code buffer to allow us to avoid allocations |
| 43 | * later. |
| 44 | */ |
| 45 | int machine_kexec_prepare(struct kimage *image) |
| 46 | { |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | void machine_kexec_cleanup(struct kimage *image) |
| 51 | { |
| 52 | } |
| 53 | |
| 54 | static void kexec_info(struct kimage *image) |
| 55 | { |
| 56 | int i; |
| 57 | printk("kexec information\n"); |
| 58 | for (i = 0; i < image->nr_segments; i++) { |
| 59 | printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n", |
| 60 | i, |
| 61 | (unsigned int)image->segment[i].mem, |
Paul Mundt | 4d5ade5 | 2007-04-27 11:25:57 +0900 | [diff] [blame] | 62 | (unsigned int)image->segment[i].mem + |
| 63 | image->segment[i].memsz, |
kogiidena | 9d44190 | 2006-01-16 22:14:10 -0800 | [diff] [blame] | 64 | (unsigned int)image->segment[i].memsz); |
Paul Mundt | 4d5ade5 | 2007-04-27 11:25:57 +0900 | [diff] [blame] | 65 | } |
kogiidena | 9d44190 | 2006-01-16 22:14:10 -0800 | [diff] [blame] | 66 | printk(" start : 0x%08x\n\n", (unsigned int)image->start); |
| 67 | } |
| 68 | |
kogiidena | 9d44190 | 2006-01-16 22:14:10 -0800 | [diff] [blame] | 69 | /* |
| 70 | * Do not allocate memory (or fail in any way) in machine_kexec(). |
| 71 | * We are past the point of no return, committed to rebooting now. |
| 72 | */ |
| 73 | NORET_TYPE void machine_kexec(struct kimage *image) |
| 74 | { |
| 75 | |
| 76 | unsigned long page_list; |
| 77 | unsigned long reboot_code_buffer; |
| 78 | unsigned long vbr_reg; |
| 79 | relocate_new_kernel_t rnk; |
| 80 | |
| 81 | #if defined(CONFIG_SH_STANDARD_BIOS) |
| 82 | vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100; |
| 83 | #else |
| 84 | vbr_reg = 0x80000000; // dummy |
| 85 | #endif |
| 86 | /* Interrupts aren't acceptable while we reboot */ |
| 87 | local_irq_disable(); |
| 88 | |
| 89 | page_list = image->head; |
| 90 | |
| 91 | /* we need both effective and real address here */ |
| 92 | reboot_code_buffer = |
| 93 | (unsigned long)page_address(image->control_code_page); |
| 94 | |
| 95 | /* copy our kernel relocation code to the control code page */ |
| 96 | memcpy((void *)reboot_code_buffer, relocate_new_kernel, |
| 97 | relocate_new_kernel_size); |
| 98 | |
| 99 | kexec_info(image); |
| 100 | flush_cache_all(); |
| 101 | |
| 102 | /* now call it */ |
| 103 | rnk = (relocate_new_kernel_t) reboot_code_buffer; |
Paul Mundt | 4d5ade5 | 2007-04-27 11:25:57 +0900 | [diff] [blame] | 104 | (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg); |
kogiidena | 9d44190 | 2006-01-16 22:14:10 -0800 | [diff] [blame] | 105 | } |
| 106 | |