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348 lines
8.1 KiB
348 lines
8.1 KiB
// 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 <[email protected]> |
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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_fdt.h> |
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#include <linux/random.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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#include <asm/byteorder.h> |
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/* relevant device tree properties */ |
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#define FDT_PROP_KEXEC_ELFHDR "linux,elfcorehdr" |
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#define FDT_PROP_MEM_RANGE "linux,usable-memory-range" |
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#define FDT_PROP_INITRD_START "linux,initrd-start" |
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#define FDT_PROP_INITRD_END "linux,initrd-end" |
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#define FDT_PROP_BOOTARGS "bootargs" |
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#define FDT_PROP_KASLR_SEED "kaslr-seed" |
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#define FDT_PROP_RNG_SEED "rng-seed" |
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#define RNG_SEED_SIZE 128 |
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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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vfree(image->arch.dtb); |
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image->arch.dtb = NULL; |
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vfree(image->arch.elf_headers); |
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image->arch.elf_headers = NULL; |
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image->arch.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 setup_dtb(struct kimage *image, |
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unsigned long initrd_load_addr, unsigned long initrd_len, |
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char *cmdline, void *dtb) |
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{ |
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int off, ret; |
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ret = fdt_path_offset(dtb, "/chosen"); |
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if (ret < 0) |
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goto out; |
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off = ret; |
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ret = fdt_delprop(dtb, off, FDT_PROP_KEXEC_ELFHDR); |
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if (ret && ret != -FDT_ERR_NOTFOUND) |
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goto out; |
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ret = fdt_delprop(dtb, off, FDT_PROP_MEM_RANGE); |
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if (ret && ret != -FDT_ERR_NOTFOUND) |
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goto out; |
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if (image->type == KEXEC_TYPE_CRASH) { |
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/* add linux,elfcorehdr */ |
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ret = fdt_appendprop_addrrange(dtb, 0, off, |
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FDT_PROP_KEXEC_ELFHDR, |
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image->arch.elf_headers_mem, |
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image->arch.elf_headers_sz); |
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if (ret) |
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return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL); |
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/* add linux,usable-memory-range */ |
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ret = fdt_appendprop_addrrange(dtb, 0, off, |
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FDT_PROP_MEM_RANGE, |
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crashk_res.start, |
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crashk_res.end - crashk_res.start + 1); |
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if (ret) |
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return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL); |
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} |
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/* add bootargs */ |
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if (cmdline) { |
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ret = fdt_setprop_string(dtb, off, FDT_PROP_BOOTARGS, cmdline); |
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if (ret) |
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goto out; |
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} else { |
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ret = fdt_delprop(dtb, off, FDT_PROP_BOOTARGS); |
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if (ret && (ret != -FDT_ERR_NOTFOUND)) |
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goto out; |
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} |
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/* add initrd-* */ |
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if (initrd_load_addr) { |
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ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_START, |
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initrd_load_addr); |
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if (ret) |
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goto out; |
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ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_END, |
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initrd_load_addr + initrd_len); |
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if (ret) |
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goto out; |
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} else { |
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ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_START); |
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if (ret && (ret != -FDT_ERR_NOTFOUND)) |
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goto out; |
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ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_END); |
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if (ret && (ret != -FDT_ERR_NOTFOUND)) |
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goto out; |
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} |
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/* add kaslr-seed */ |
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ret = fdt_delprop(dtb, off, FDT_PROP_KASLR_SEED); |
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if (ret == -FDT_ERR_NOTFOUND) |
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ret = 0; |
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else if (ret) |
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goto out; |
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if (rng_is_initialized()) { |
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u64 seed = get_random_u64(); |
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ret = fdt_setprop_u64(dtb, off, FDT_PROP_KASLR_SEED, seed); |
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if (ret) |
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goto out; |
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} else { |
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pr_notice("RNG is not initialised: omitting \"%s\" property\n", |
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FDT_PROP_KASLR_SEED); |
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} |
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/* add rng-seed */ |
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if (rng_is_initialized()) { |
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void *rng_seed; |
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ret = fdt_setprop_placeholder(dtb, off, FDT_PROP_RNG_SEED, |
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RNG_SEED_SIZE, &rng_seed); |
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if (ret) |
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goto out; |
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get_random_bytes(rng_seed, RNG_SEED_SIZE); |
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} else { |
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pr_notice("RNG is not initialised: omitting \"%s\" property\n", |
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FDT_PROP_RNG_SEED); |
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} |
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out: |
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if (ret) |
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return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL; |
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return 0; |
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} |
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/* |
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* More space needed so that we can add initrd, bootargs, kaslr-seed, |
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* rng-seed, userable-memory-range and elfcorehdr. |
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*/ |
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#define DTB_EXTRA_SPACE 0x1000 |
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static int create_dtb(struct kimage *image, |
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unsigned long initrd_load_addr, unsigned long initrd_len, |
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char *cmdline, void **dtb) |
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{ |
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void *buf; |
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size_t buf_size; |
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size_t cmdline_len; |
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int ret; |
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cmdline_len = cmdline ? strlen(cmdline) : 0; |
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buf_size = fdt_totalsize(initial_boot_params) |
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+ cmdline_len + DTB_EXTRA_SPACE; |
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for (;;) { |
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buf = vmalloc(buf_size); |
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if (!buf) |
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return -ENOMEM; |
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/* duplicate a device tree blob */ |
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ret = fdt_open_into(initial_boot_params, buf, buf_size); |
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if (ret) { |
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vfree(buf); |
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return -EINVAL; |
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} |
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ret = setup_dtb(image, initrd_load_addr, initrd_len, |
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cmdline, buf); |
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if (ret) { |
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vfree(buf); |
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if (ret == -ENOMEM) { |
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/* unlikely, but just in case */ |
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buf_size += DTB_EXTRA_SPACE; |
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continue; |
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} else { |
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return ret; |
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} |
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} |
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/* trim it */ |
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fdt_pack(buf); |
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*dtb = buf; |
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return 0; |
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} |
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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->arch.elf_headers = headers; |
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image->arch.elf_headers_mem = kbuf.mem; |
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image->arch.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->arch.elf_headers_mem, 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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ret = create_dtb(image, initrd_load_addr, initrd_len, cmdline, &dtb); |
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if (ret) { |
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pr_err("Preparing for new dtb failed\n"); |
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goto out_err; |
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} |
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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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vfree(dtb); |
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return ret; |
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}
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