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 28 extern const unsigned char relocate_new_kernel[]; 29 extern const unsigned int relocate_new_kernel_size; 30 extern void *gdb_vbr_vector; 31 32 /* 33 * Provide a dummy crash_notes definition while crash dump arrives to ppc. 34 * This prevents breakage of crash_notes attribute in kernel/ksysfs.c. 35 */ 36 void *crash_notes = NULL; 37 38 void machine_shutdown(void) 39 { 40 } 41 42 void machine_crash_shutdown(struct pt_regs *regs) 43 { 44 } 45 46 /* 47 * Do what every setup is needed on image and the 48 * reboot code buffer to allow us to avoid allocations 49 * later. 50 */ 51 int machine_kexec_prepare(struct kimage *image) 52 { 53 return 0; 54 } 55 56 void machine_kexec_cleanup(struct kimage *image) 57 { 58 } 59 60 static void kexec_info(struct kimage *image) 61 { 62 int i; 63 printk("kexec information\n"); 64 for (i = 0; i < image->nr_segments; i++) { 65 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n", 66 i, 67 (unsigned int)image->segment[i].mem, 68 (unsigned int)image->segment[i].mem + image->segment[i].memsz, 69 (unsigned int)image->segment[i].memsz); 70 } 71 printk(" start : 0x%08x\n\n", (unsigned int)image->start); 72 } 73 74 75 /* 76 * Do not allocate memory (or fail in any way) in machine_kexec(). 77 * We are past the point of no return, committed to rebooting now. 78 */ 79 NORET_TYPE void machine_kexec(struct kimage *image) 80 { 81 82 unsigned long page_list; 83 unsigned long reboot_code_buffer; 84 unsigned long vbr_reg; 85 relocate_new_kernel_t rnk; 86 87 #if defined(CONFIG_SH_STANDARD_BIOS) 88 vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100; 89 #else 90 vbr_reg = 0x80000000; // dummy 91 #endif 92 /* Interrupts aren't acceptable while we reboot */ 93 local_irq_disable(); 94 95 page_list = image->head; 96 97 /* we need both effective and real address here */ 98 reboot_code_buffer = 99 (unsigned long)page_address(image->control_code_page); 100 101 /* copy our kernel relocation code to the control code page */ 102 memcpy((void *)reboot_code_buffer, relocate_new_kernel, 103 relocate_new_kernel_size); 104 105 kexec_info(image); 106 flush_cache_all(); 107 108 /* now call it */ 109 rnk = (relocate_new_kernel_t) reboot_code_buffer; 110 (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg); 111 } 112 113