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