| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * kexec_file for arm64 |
| * |
| * Copyright (C) 2018 Linaro Limited |
| * Author: AKASHI Takahiro <takahiro.akashi@linaro.org> |
| * |
| * Most code is derived from arm64 port of kexec-tools |
| */ |
| |
| #define pr_fmt(fmt) "kexec_file: " fmt |
| |
| #include <linux/ioport.h> |
| #include <linux/kernel.h> |
| #include <linux/kexec.h> |
| #include <linux/libfdt.h> |
| #include <linux/memblock.h> |
| #include <linux/of.h> |
| #include <linux/of_fdt.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/vmalloc.h> |
| |
| const struct kexec_file_ops * const kexec_file_loaders[] = { |
| &kexec_image_ops, |
| NULL |
| }; |
| |
| int arch_kimage_file_post_load_cleanup(struct kimage *image) |
| { |
| kvfree(image->arch.dtb); |
| image->arch.dtb = NULL; |
| |
| vfree(image->elf_headers); |
| image->elf_headers = NULL; |
| image->elf_headers_sz = 0; |
| |
| return kexec_image_post_load_cleanup_default(image); |
| } |
| |
| static int prepare_elf_headers(void **addr, unsigned long *sz) |
| { |
| struct crash_mem *cmem; |
| unsigned int nr_ranges; |
| int ret; |
| u64 i; |
| phys_addr_t start, end; |
| |
| nr_ranges = 1; /* for exclusion of crashkernel region */ |
| for_each_mem_range(i, &start, &end) |
| nr_ranges++; |
| |
| cmem = kmalloc(struct_size(cmem, ranges, nr_ranges), GFP_KERNEL); |
| if (!cmem) |
| return -ENOMEM; |
| |
| cmem->max_nr_ranges = nr_ranges; |
| cmem->nr_ranges = 0; |
| for_each_mem_range(i, &start, &end) { |
| cmem->ranges[cmem->nr_ranges].start = start; |
| cmem->ranges[cmem->nr_ranges].end = end - 1; |
| cmem->nr_ranges++; |
| } |
| |
| /* Exclude crashkernel region */ |
| ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end); |
| if (ret) |
| goto out; |
| |
| if (crashk_low_res.end) { |
| ret = crash_exclude_mem_range(cmem, crashk_low_res.start, crashk_low_res.end); |
| if (ret) |
| goto out; |
| } |
| |
| ret = crash_prepare_elf64_headers(cmem, true, addr, sz); |
| |
| out: |
| kfree(cmem); |
| return ret; |
| } |
| |
| /* |
| * Tries to add the initrd and DTB to the image. If it is not possible to find |
| * valid locations, this function will undo changes to the image and return non |
| * zero. |
| */ |
| int load_other_segments(struct kimage *image, |
| unsigned long kernel_load_addr, |
| unsigned long kernel_size, |
| char *initrd, unsigned long initrd_len, |
| char *cmdline) |
| { |
| struct kexec_buf kbuf; |
| void *headers, *dtb = NULL; |
| unsigned long headers_sz, initrd_load_addr = 0, dtb_len, |
| orig_segments = image->nr_segments; |
| int ret = 0; |
| |
| kbuf.image = image; |
| /* not allocate anything below the kernel */ |
| kbuf.buf_min = kernel_load_addr + kernel_size; |
| |
| /* load elf core header */ |
| if (image->type == KEXEC_TYPE_CRASH) { |
| ret = prepare_elf_headers(&headers, &headers_sz); |
| if (ret) { |
| pr_err("Preparing elf core header failed\n"); |
| goto out_err; |
| } |
| |
| kbuf.buffer = headers; |
| kbuf.bufsz = headers_sz; |
| kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; |
| kbuf.memsz = headers_sz; |
| kbuf.buf_align = SZ_64K; /* largest supported page size */ |
| kbuf.buf_max = ULONG_MAX; |
| kbuf.top_down = true; |
| |
| ret = kexec_add_buffer(&kbuf); |
| if (ret) { |
| vfree(headers); |
| goto out_err; |
| } |
| image->elf_headers = headers; |
| image->elf_load_addr = kbuf.mem; |
| image->elf_headers_sz = headers_sz; |
| |
| pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n", |
| image->elf_load_addr, kbuf.bufsz, kbuf.memsz); |
| } |
| |
| /* load initrd */ |
| if (initrd) { |
| kbuf.buffer = initrd; |
| kbuf.bufsz = initrd_len; |
| kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; |
| kbuf.memsz = initrd_len; |
| kbuf.buf_align = 0; |
| /* within 1GB-aligned window of up to 32GB in size */ |
| kbuf.buf_max = round_down(kernel_load_addr, SZ_1G) |
| + (unsigned long)SZ_1G * 32; |
| kbuf.top_down = false; |
| |
| ret = kexec_add_buffer(&kbuf); |
| if (ret) |
| goto out_err; |
| initrd_load_addr = kbuf.mem; |
| |
| pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n", |
| initrd_load_addr, kbuf.bufsz, kbuf.memsz); |
| } |
| |
| /* load dtb */ |
| dtb = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr, |
| initrd_len, cmdline, 0); |
| if (!dtb) { |
| pr_err("Preparing for new dtb failed\n"); |
| ret = -EINVAL; |
| goto out_err; |
| } |
| |
| /* trim it */ |
| fdt_pack(dtb); |
| dtb_len = fdt_totalsize(dtb); |
| kbuf.buffer = dtb; |
| kbuf.bufsz = dtb_len; |
| kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; |
| kbuf.memsz = dtb_len; |
| /* not across 2MB boundary */ |
| kbuf.buf_align = SZ_2M; |
| kbuf.buf_max = ULONG_MAX; |
| kbuf.top_down = true; |
| |
| ret = kexec_add_buffer(&kbuf); |
| if (ret) |
| goto out_err; |
| image->arch.dtb = dtb; |
| image->arch.dtb_mem = kbuf.mem; |
| |
| pr_debug("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n", |
| kbuf.mem, kbuf.bufsz, kbuf.memsz); |
| |
| return 0; |
| |
| out_err: |
| image->nr_segments = orig_segments; |
| kvfree(dtb); |
| return ret; |
| } |