// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/console.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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extern void relocate_new_kernel(unsigned long head,
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unsigned long start,
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unsigned long phys);
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extern const unsigned int relocate_new_kernel_size;
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extern unsigned int kexec_initrd_start_offset;
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extern unsigned int kexec_initrd_end_offset;
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extern unsigned int kexec_cmdline_offset;
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extern unsigned int kexec_free_mem_offset;
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static void kexec_show_segment_info(const struct kimage *kimage,
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unsigned long n)
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{
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pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
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n,
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kimage->segment[n].mem,
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kimage->segment[n].mem + kimage->segment[n].memsz,
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(unsigned long)kimage->segment[n].memsz,
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(unsigned long)kimage->segment[n].memsz / PAGE_SIZE);
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}
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static void kexec_image_info(const struct kimage *kimage)
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{
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unsigned long i;
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pr_debug("kexec kimage info:\n");
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pr_debug(" type: %d\n", kimage->type);
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pr_debug(" start: %lx\n", kimage->start);
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pr_debug(" head: %lx\n", kimage->head);
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pr_debug(" nr_segments: %lu\n", kimage->nr_segments);
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for (i = 0; i < kimage->nr_segments; i++)
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kexec_show_segment_info(kimage, i);
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#ifdef CONFIG_KEXEC_FILE
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if (kimage->file_mode) {
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pr_debug("cmdline: %.*s\n", (int)kimage->cmdline_buf_len,
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kimage->cmdline_buf);
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}
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#endif
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}
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void machine_kexec_cleanup(struct kimage *kimage)
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{
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}
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void machine_crash_shutdown(struct pt_regs *regs)
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{
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}
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void machine_shutdown(void)
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{
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smp_send_stop();
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while (num_online_cpus() > 1) {
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cpu_relax();
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mdelay(1);
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}
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}
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void machine_kexec(struct kimage *image)
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{
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#ifdef CONFIG_64BIT
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Elf64_Fdesc desc;
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#endif
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void (*reloc)(unsigned long head,
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unsigned long start,
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unsigned long phys);
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unsigned long phys = page_to_phys(image->control_code_page);
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void *virt = (void *)__fix_to_virt(FIX_TEXT_KEXEC);
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struct kimage_arch *arch = &image->arch;
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set_fixmap(FIX_TEXT_KEXEC, phys);
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flush_cache_all();
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#ifdef CONFIG_64BIT
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reloc = (void *)&desc;
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desc.addr = (long long)virt;
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#else
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reloc = (void *)virt;
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#endif
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memcpy(virt, dereference_function_descriptor(relocate_new_kernel),
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relocate_new_kernel_size);
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*(unsigned long *)(virt + kexec_cmdline_offset) = arch->cmdline;
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*(unsigned long *)(virt + kexec_initrd_start_offset) = arch->initrd_start;
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*(unsigned long *)(virt + kexec_initrd_end_offset) = arch->initrd_end;
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*(unsigned long *)(virt + kexec_free_mem_offset) = PAGE0->mem_free;
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flush_cache_all();
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flush_tlb_all();
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local_irq_disable();
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reloc(image->head & PAGE_MASK, image->start, phys);
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}
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int machine_kexec_prepare(struct kimage *image)
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{
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kexec_image_info(image);
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return 0;
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}
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