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/pgtable.h> 18 #include <asm/pgalloc.h> 19 #include <asm/mmu_context.h> 20 #include <asm/io.h> 21 #include <asm/cacheflush.h> 22 #include <asm/sh_bios.h> 23 #include <asm/reboot.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 *vbr_base; 32 33 void native_machine_crash_shutdown(struct pt_regs *regs) 34 { 35 /* Nothing to do for UP, but definitely broken for SMP.. */ 36 } 37 38 /* 39 * Do what every setup is needed on image and the 40 * reboot code buffer to allow us to avoid allocations 41 * later. 42 */ 43 int machine_kexec_prepare(struct kimage *image) 44 { 45 return 0; 46 } 47 48 void machine_kexec_cleanup(struct kimage *image) 49 { 50 } 51 52 static void kexec_info(struct kimage *image) 53 { 54 int i; 55 printk("kexec information\n"); 56 for (i = 0; i < image->nr_segments; i++) { 57 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n", 58 i, 59 (unsigned int)image->segment[i].mem, 60 (unsigned int)image->segment[i].mem + 61 image->segment[i].memsz, 62 (unsigned int)image->segment[i].memsz); 63 } 64 printk(" start : 0x%08x\n\n", (unsigned int)image->start); 65 } 66 67 /* 68 * Do not allocate memory (or fail in any way) in machine_kexec(). 69 * We are past the point of no return, committed to rebooting now. 70 */ 71 void machine_kexec(struct kimage *image) 72 { 73 unsigned long page_list; 74 unsigned long reboot_code_buffer; 75 relocate_new_kernel_t rnk; 76 unsigned long entry; 77 unsigned long *ptr; 78 int save_ftrace_enabled; 79 80 /* 81 * Nicked from the mips version of machine_kexec(): 82 * The generic kexec code builds a page list with physical 83 * addresses. Use phys_to_virt() to convert them to virtual. 84 */ 85 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); 86 ptr = (entry & IND_INDIRECTION) ? 87 phys_to_virt(entry & PAGE_MASK) : ptr + 1) { 88 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || 89 *ptr & IND_DESTINATION) 90 *ptr = (unsigned long) phys_to_virt(*ptr); 91 } 92 93 #ifdef CONFIG_KEXEC_JUMP 94 if (image->preserve_context) 95 save_processor_state(); 96 #endif 97 98 save_ftrace_enabled = __ftrace_enabled_save(); 99 100 /* Interrupts aren't acceptable while we reboot */ 101 local_irq_disable(); 102 103 page_list = image->head; 104 105 /* we need both effective and real address here */ 106 reboot_code_buffer = 107 (unsigned long)page_address(image->control_code_page); 108 109 /* copy our kernel relocation code to the control code page */ 110 memcpy((void *)reboot_code_buffer, relocate_new_kernel, 111 relocate_new_kernel_size); 112 113 kexec_info(image); 114 flush_cache_all(); 115 116 sh_bios_vbr_reload(); 117 118 /* now call it */ 119 rnk = (relocate_new_kernel_t) reboot_code_buffer; 120 (*rnk)(page_list, reboot_code_buffer, 121 (unsigned long)phys_to_virt(image->start)); 122 123 #ifdef CONFIG_KEXEC_JUMP 124 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory"); 125 126 if (image->preserve_context) 127 restore_processor_state(); 128 129 /* Convert page list back to physical addresses, what a mess. */ 130 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); 131 ptr = (*ptr & IND_INDIRECTION) ? 132 phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) { 133 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION || 134 *ptr & IND_DESTINATION) 135 *ptr = virt_to_phys(*ptr); 136 } 137 #endif 138 139 __ftrace_enabled_restore(save_ftrace_enabled); 140 } 141 142 void arch_crash_save_vmcoreinfo(void) 143 { 144 #ifdef CONFIG_NUMA 145 VMCOREINFO_SYMBOL(node_data); 146 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); 147 #endif 148 #ifdef CONFIG_X2TLB 149 VMCOREINFO_CONFIG(X2TLB); 150 #endif 151 } 152 153 void __init reserve_crashkernel(void) 154 { 155 unsigned long long crash_size, crash_base; 156 int ret; 157 158 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), 159 &crash_size, &crash_base); 160 if (ret == 0 && crash_size > 0) { 161 crashk_res.start = crash_base; 162 crashk_res.end = crash_base + crash_size - 1; 163 } 164 165 if (crashk_res.end == crashk_res.start) 166 goto disable; 167 168 crash_size = PAGE_ALIGN(resource_size(&crashk_res)); 169 if (!crashk_res.start) { 170 unsigned long max = memblock_end_of_DRAM() - memory_limit; 171 crashk_res.start = memblock_phys_alloc_range(crash_size, 172 PAGE_SIZE, 0, max); 173 if (!crashk_res.start) { 174 pr_err("crashkernel allocation failed\n"); 175 goto disable; 176 } 177 } else { 178 ret = memblock_reserve(crashk_res.start, crash_size); 179 if (unlikely(ret < 0)) { 180 pr_err("crashkernel reservation failed - " 181 "memory is in use\n"); 182 goto disable; 183 } 184 } 185 186 crashk_res.end = crashk_res.start + crash_size - 1; 187 188 /* 189 * Crash kernel trumps memory limit 190 */ 191 if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) { 192 memory_limit = 0; 193 pr_info("Disabled memory limit for crashkernel\n"); 194 } 195 196 pr_info("Reserving %ldMB of memory at 0x%08lx " 197 "for crashkernel (System RAM: %ldMB)\n", 198 (unsigned long)(crash_size >> 20), 199 (unsigned long)(crashk_res.start), 200 (unsigned long)(memblock_phys_mem_size() >> 20)); 201 202 return; 203 204 disable: 205 crashk_res.start = crashk_res.end = 0; 206 } 207