1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * machine_kexec.c - handle transition of Linux booting another kernel 4 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> 5 * 6 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz 7 * LANDISK/sh4 supported by kogiidena 8 */ 9 #include <linux/mm.h> 10 #include <linux/kexec.h> 11 #include <linux/delay.h> 12 #include <linux/reboot.h> 13 #include <linux/numa.h> 14 #include <linux/ftrace.h> 15 #include <linux/suspend.h> 16 #include <linux/memblock.h> 17 #include <asm/pgalloc.h> 18 #include <asm/mmu_context.h> 19 #include <asm/io.h> 20 #include <asm/cacheflush.h> 21 #include <asm/sh_bios.h> 22 #include <asm/reboot.h> 23 24 typedef void (*relocate_new_kernel_t)(unsigned long indirection_page, 25 unsigned long reboot_code_buffer, 26 unsigned long start_address); 27 28 extern const unsigned char relocate_new_kernel[]; 29 extern const unsigned int relocate_new_kernel_size; 30 extern void *vbr_base; 31 32 void native_machine_crash_shutdown(struct pt_regs *regs) 33 { 34 /* Nothing to do for UP, but definitely broken for SMP.. */ 35 } 36 37 /* 38 * Do what every setup is needed on image and the 39 * reboot code buffer to allow us to avoid allocations 40 * later. 41 */ 42 int machine_kexec_prepare(struct kimage *image) 43 { 44 return 0; 45 } 46 47 void machine_kexec_cleanup(struct kimage *image) 48 { 49 } 50 51 static void kexec_info(struct kimage *image) 52 { 53 int i; 54 printk("kexec information\n"); 55 for (i = 0; i < image->nr_segments; i++) { 56 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n", 57 i, 58 (unsigned int)image->segment[i].mem, 59 (unsigned int)image->segment[i].mem + 60 image->segment[i].memsz, 61 (unsigned int)image->segment[i].memsz); 62 } 63 printk(" start : 0x%08x\n\n", (unsigned int)image->start); 64 } 65 66 /* 67 * Do not allocate memory (or fail in any way) in machine_kexec(). 68 * We are past the point of no return, committed to rebooting now. 69 */ 70 void machine_kexec(struct kimage *image) 71 { 72 unsigned long page_list; 73 unsigned long reboot_code_buffer; 74 relocate_new_kernel_t rnk; 75 unsigned long entry; 76 unsigned long *ptr; 77 int save_ftrace_enabled; 78 79 /* 80 * Nicked from the mips version of machine_kexec(): 81 * The generic kexec code builds a page list with physical 82 * addresses. Use phys_to_virt() to convert them to virtual. 83 */ 84 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); 85 ptr = (entry & IND_INDIRECTION) ? 86 phys_to_virt(entry & PAGE_MASK) : ptr + 1) { 87 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || 88 *ptr & IND_DESTINATION) 89 *ptr = (unsigned long) phys_to_virt(*ptr); 90 } 91 92 #ifdef CONFIG_KEXEC_JUMP 93 if (image->preserve_context) 94 save_processor_state(); 95 #endif 96 97 save_ftrace_enabled = __ftrace_enabled_save(); 98 99 /* Interrupts aren't acceptable while we reboot */ 100 local_irq_disable(); 101 102 page_list = image->head; 103 104 /* we need both effective and real address here */ 105 reboot_code_buffer = 106 (unsigned long)page_address(image->control_code_page); 107 108 /* copy our kernel relocation code to the control code page */ 109 memcpy((void *)reboot_code_buffer, relocate_new_kernel, 110 relocate_new_kernel_size); 111 112 kexec_info(image); 113 flush_cache_all(); 114 115 sh_bios_vbr_reload(); 116 117 /* now call it */ 118 rnk = (relocate_new_kernel_t) reboot_code_buffer; 119 (*rnk)(page_list, reboot_code_buffer, 120 (unsigned long)phys_to_virt(image->start)); 121 122 #ifdef CONFIG_KEXEC_JUMP 123 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory"); 124 125 if (image->preserve_context) 126 restore_processor_state(); 127 128 /* Convert page list back to physical addresses, what a mess. */ 129 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); 130 ptr = (*ptr & IND_INDIRECTION) ? 131 phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) { 132 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || 133 *ptr & IND_DESTINATION) 134 *ptr = virt_to_phys(*ptr); 135 } 136 #endif 137 138 __ftrace_enabled_restore(save_ftrace_enabled); 139 } 140 141 void arch_crash_save_vmcoreinfo(void) 142 { 143 #ifdef CONFIG_NUMA 144 VMCOREINFO_SYMBOL(node_data); 145 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); 146 #endif 147 #ifdef CONFIG_X2TLB 148 VMCOREINFO_CONFIG(X2TLB); 149 #endif 150 } 151 152 void __init reserve_crashkernel(void) 153 { 154 unsigned long long crash_size, crash_base; 155 int ret; 156 157 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), 158 &crash_size, &crash_base); 159 if (ret == 0 && crash_size > 0) { 160 crashk_res.start = crash_base; 161 crashk_res.end = crash_base + crash_size - 1; 162 } 163 164 if (crashk_res.end == crashk_res.start) 165 goto disable; 166 167 crash_size = PAGE_ALIGN(resource_size(&crashk_res)); 168 if (!crashk_res.start) { 169 unsigned long max = memblock_end_of_DRAM() - memory_limit; 170 crashk_res.start = memblock_phys_alloc_range(crash_size, 171 PAGE_SIZE, 0, max); 172 if (!crashk_res.start) { 173 pr_err("crashkernel allocation failed\n"); 174 goto disable; 175 } 176 } else { 177 ret = memblock_reserve(crashk_res.start, crash_size); 178 if (unlikely(ret < 0)) { 179 pr_err("crashkernel reservation failed - " 180 "memory is in use\n"); 181 goto disable; 182 } 183 } 184 185 crashk_res.end = crashk_res.start + crash_size - 1; 186 187 /* 188 * Crash kernel trumps memory limit 189 */ 190 if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) { 191 memory_limit = 0; 192 pr_info("Disabled memory limit for crashkernel\n"); 193 } 194 195 pr_info("Reserving %ldMB of memory at 0x%08lx " 196 "for crashkernel (System RAM: %ldMB)\n", 197 (unsigned long)(crash_size >> 20), 198 (unsigned long)(crashk_res.start), 199 (unsigned long)(memblock_phys_mem_size() >> 20)); 200 201 return; 202 203 disable: 204 crashk_res.start = crashk_res.end = 0; 205 } 206