mirror of
https://gitee.com/open-loongarch/linux-6.12.git
synced 2026-10-29 06:27:12 +08:00
Youling Tang
7265b47981
This patch creates kexec_efi_ops to load EFI binary file for kexec_file_load() syscall. The efi_kexec_load() as two parts: - the first part loads the kernel image (vmlinuz.efi or vmlinux.efi) - the second part loads other segments (e.g: initrd, cmdline, etc) Currently, pez (vmlinuz.efi) and pei (vmlinux.efi) format images are supported. The basic usage (vmlinuz.efi or vmlinux.efi): 1) Load second kernel image: # kexec -s -l vmlinuz.efi --initrd=initrd.img --reuse-cmdline 2) Startup second kernel: # kexec -e Signed-off-by: Youling Tang <tangyouling@kylinos.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* kexec_file for LoongArch
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*
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* Author: Youling Tang <tangyouling@kylinos.cn>
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* Copyright (C) 2025 KylinSoft Corporation.
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*
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* Most code is derived from LoongArch 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/memblock.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/bootinfo.h>
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const struct kexec_file_ops * const kexec_file_loaders[] = {
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&kexec_efi_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->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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/* Add the "kexec_file" command line parameter to command line. */
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static void cmdline_add_loader(unsigned long *cmdline_tmplen, char *modified_cmdline)
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{
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int loader_strlen;
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loader_strlen = sprintf(modified_cmdline + (*cmdline_tmplen), "kexec_file ");
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*cmdline_tmplen += loader_strlen;
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}
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/* Add the "initrd=start,size" command line parameter to command line. */
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static void cmdline_add_initrd(struct kimage *image, unsigned long *cmdline_tmplen,
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char *modified_cmdline, unsigned long initrd)
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{
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int initrd_strlen;
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initrd_strlen = sprintf(modified_cmdline + (*cmdline_tmplen), "initrd=0x%lx,0x%lx ",
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initrd, image->initrd_buf_len);
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*cmdline_tmplen += initrd_strlen;
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}
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/*
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* Try to add the initrd to the image. If it is not possible to find valid
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* locations, this function will undo changes to the image and return non 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, unsigned long kernel_size,
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char *initrd, unsigned long initrd_len, char *cmdline, unsigned long cmdline_len)
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{
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int ret = 0;
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unsigned long cmdline_tmplen = 0;
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unsigned long initrd_load_addr = 0;
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unsigned long orig_segments = image->nr_segments;
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char *modified_cmdline = NULL;
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struct kexec_buf kbuf;
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kbuf.image = image;
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/* Don't allocate anything below the kernel */
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kbuf.buf_min = kernel_load_addr + kernel_size;
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modified_cmdline = kzalloc(COMMAND_LINE_SIZE, GFP_KERNEL);
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if (!modified_cmdline)
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return -EINVAL;
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cmdline_add_loader(&cmdline_tmplen, modified_cmdline);
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/* Ensure it's null terminated */
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modified_cmdline[COMMAND_LINE_SIZE - 1] = '\0';
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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) + (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 < 0)
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goto out_err;
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initrd_load_addr = kbuf.mem;
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kexec_dprintk("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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/* Add the initrd=start,size parameter to the command line */
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cmdline_add_initrd(image, &cmdline_tmplen, modified_cmdline, initrd_load_addr);
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}
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if (cmdline_len + cmdline_tmplen > COMMAND_LINE_SIZE) {
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pr_err("Appending command line exceeds COMMAND_LINE_SIZE\n");
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ret = -EINVAL;
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goto out_err;
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}
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memcpy(modified_cmdline + cmdline_tmplen, cmdline, cmdline_len);
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cmdline = modified_cmdline;
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image->arch.cmdline_ptr = (unsigned long)cmdline;
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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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kfree(modified_cmdline);
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return ret;
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}
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