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 <linux/numa.h> 17 #include <linux/ftrace.h> 18 #include <linux/suspend.h> 19 #include <asm/pgtable.h> 20 #include <asm/pgalloc.h> 21 #include <asm/mmu_context.h> 22 #include <asm/io.h> 23 #include <asm/cacheflush.h> 24 25 typedef void (*relocate_new_kernel_t)(unsigned long indirection_page, 26 unsigned long reboot_code_buffer, 27 unsigned long start_address); 28 29 extern const unsigned char relocate_new_kernel[]; 30 extern const unsigned int relocate_new_kernel_size; 31 extern void *gdb_vbr_vector; 32 extern void *vbr_base; 33 34 void machine_shutdown(void) 35 { 36 } 37 38 void machine_crash_shutdown(struct pt_regs *regs) 39 { 40 } 41 42 /* 43 * Do what every setup is needed on image and the 44 * reboot code buffer to allow us to avoid allocations 45 * later. 46 */ 47 int machine_kexec_prepare(struct kimage *image) 48 { 49 return 0; 50 } 51 52 void machine_kexec_cleanup(struct kimage *image) 53 { 54 } 55 56 static void kexec_info(struct kimage *image) 57 { 58 int i; 59 printk("kexec information\n"); 60 for (i = 0; i < image->nr_segments; i++) { 61 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n", 62 i, 63 (unsigned int)image->segment[i].mem, 64 (unsigned int)image->segment[i].mem + 65 image->segment[i].memsz, 66 (unsigned int)image->segment[i].memsz); 67 } 68 printk(" start : 0x%08x\n\n", (unsigned int)image->start); 69 } 70 71 /* 72 * Do not allocate memory (or fail in any way) in machine_kexec(). 73 * We are past the point of no return, committed to rebooting now. 74 */ 75 void machine_kexec(struct kimage *image) 76 { 77 unsigned long page_list; 78 unsigned long reboot_code_buffer; 79 relocate_new_kernel_t rnk; 80 unsigned long entry; 81 unsigned long *ptr; 82 int save_ftrace_enabled; 83 84 /* 85 * Nicked from the mips version of machine_kexec(): 86 * The generic kexec code builds a page list with physical 87 * addresses. Use phys_to_virt() to convert them to virtual. 88 */ 89 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); 90 ptr = (entry & IND_INDIRECTION) ? 91 phys_to_virt(entry & PAGE_MASK) : ptr + 1) { 92 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || 93 *ptr & IND_DESTINATION) 94 *ptr = (unsigned long) phys_to_virt(*ptr); 95 } 96 97 #ifdef CONFIG_KEXEC_JUMP 98 if (image->preserve_context) 99 save_processor_state(); 100 #endif 101 102 save_ftrace_enabled = __ftrace_enabled_save(); 103 104 /* Interrupts aren't acceptable while we reboot */ 105 local_irq_disable(); 106 107 page_list = image->head; 108 109 /* we need both effective and real address here */ 110 reboot_code_buffer = 111 (unsigned long)page_address(image->control_code_page); 112 113 /* copy our kernel relocation code to the control code page */ 114 memcpy((void *)reboot_code_buffer, relocate_new_kernel, 115 relocate_new_kernel_size); 116 117 kexec_info(image); 118 flush_cache_all(); 119 120 #if defined(CONFIG_SH_STANDARD_BIOS) 121 asm volatile("ldc %0, vbr" : 122 : "r" (((unsigned long) gdb_vbr_vector) - 0x100) 123 : "memory"); 124 #endif 125 126 /* now call it */ 127 rnk = (relocate_new_kernel_t) reboot_code_buffer; 128 (*rnk)(page_list, reboot_code_buffer, 129 (unsigned long)phys_to_virt(image->start)); 130 131 #ifdef CONFIG_KEXEC_JUMP 132 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory"); 133 134 if (image->preserve_context) 135 restore_processor_state(); 136 137 /* Convert page list back to physical addresses, what a mess. */ 138 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); 139 ptr = (*ptr & IND_INDIRECTION) ? 140 phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) { 141 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || 142 *ptr & IND_DESTINATION) 143 *ptr = virt_to_phys(*ptr); 144 } 145 #endif 146 147 __ftrace_enabled_restore(save_ftrace_enabled); 148 } 149 150 void arch_crash_save_vmcoreinfo(void) 151 { 152 #ifdef CONFIG_NUMA 153 VMCOREINFO_SYMBOL(node_data); 154 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); 155 #endif 156 } 157