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809a11eea8
This patch creates image_kexec_ops to load Image binary file for kexec_file_load() syscall. Signed-off-by: Song Shuai <songshuaishuai@tinylab.org> Signed-off-by: Björn Töpel <bjorn@rivosinc.com> Link: https://lore.kernel.org/r/20250409193004.643839-3-bjorn@kernel.org Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* RISC-V Kexec image loader
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*
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*/
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#define pr_fmt(fmt) "kexec_file(Image): " fmt
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/kexec.h>
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#include <linux/pe.h>
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#include <linux/string.h>
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#include <asm/byteorder.h>
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#include <asm/image.h>
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static int image_probe(const char *kernel_buf, unsigned long kernel_len)
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{
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const struct riscv_image_header *h = (const struct riscv_image_header *)kernel_buf;
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if (!h || kernel_len < sizeof(*h))
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return -EINVAL;
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/* According to Documentation/riscv/boot-image-header.rst,
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* use "magic2" field to check when version >= 0.2.
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*/
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if (h->version >= RISCV_HEADER_VERSION &&
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memcmp(&h->magic2, RISCV_IMAGE_MAGIC2, sizeof(h->magic2)))
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return -EINVAL;
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return 0;
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}
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static void *image_load(struct kimage *image,
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char *kernel, unsigned long kernel_len,
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char *initrd, unsigned long initrd_len,
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char *cmdline, unsigned long cmdline_len)
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{
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struct riscv_image_header *h;
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u64 flags;
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bool be_image, be_kernel;
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struct kexec_buf kbuf;
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int ret;
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/* Check Image header */
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h = (struct riscv_image_header *)kernel;
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if (!h->image_size) {
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ret = -EINVAL;
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goto out;
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}
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/* Check endianness */
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flags = le64_to_cpu(h->flags);
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be_image = riscv_image_flag_field(flags, RISCV_IMAGE_FLAG_BE);
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be_kernel = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
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if (be_image != be_kernel) {
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ret = -EINVAL;
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goto out;
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}
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/* Load the kernel image */
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kbuf.image = image;
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kbuf.buf_min = 0;
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kbuf.buf_max = ULONG_MAX;
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kbuf.top_down = false;
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kbuf.buffer = kernel;
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kbuf.bufsz = kernel_len;
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kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
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kbuf.memsz = le64_to_cpu(h->image_size);
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kbuf.buf_align = le64_to_cpu(h->text_offset);
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ret = kexec_add_buffer(&kbuf);
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if (ret) {
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pr_err("Error add kernel image ret=%d\n", ret);
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goto out;
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}
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image->start = kbuf.mem;
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pr_info("Loaded kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
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kbuf.mem, kbuf.bufsz, kbuf.memsz);
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ret = load_extra_segments(image, kbuf.mem, kbuf.memsz,
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initrd, initrd_len, cmdline, cmdline_len);
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out:
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return ret ? ERR_PTR(ret) : NULL;
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}
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const struct kexec_file_ops image_kexec_ops = {
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.probe = image_probe,
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.load = image_load,
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};
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