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