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// SPDX-License-Identifier: GPL-2.0
/*
* Load EFI vmlinux file for the kexec_file_load syscall.
*
* Author: Youling Tang <tangyouling@kylinos.cn>
* Copyright (C) 2025 KylinSoft Corporation.
*/
#define pr_fmt(fmt) "kexec_file(EFI): " fmt
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kexec.h>
#include <linux/pe.h>
#include <linux/string.h>
#include <asm/byteorder.h>
#include <asm/cpufeature.h>
#include <asm/image.h>
static int efi_kexec_probe(const char *kernel_buf, unsigned long kernel_len)
{
const struct loongarch_image_header *h = (const struct loongarch_image_header *)kernel_buf;
if (!h || (kernel_len < sizeof(*h))) {
kexec_dprintk("No LoongArch image header.\n");
return -EINVAL;
}
if (!loongarch_header_check_dos_sig(h)) {
kexec_dprintk("No LoongArch PE image header.\n");
return -EINVAL;
}
return 0;
}
static void *efi_kexec_load(struct kimage *image,
char *kernel, unsigned long kernel_len,
char *initrd, unsigned long initrd_len,
char *cmdline, unsigned long cmdline_len)
{
int ret;
unsigned long text_offset, kernel_segment_number;
struct kexec_buf kbuf;
struct kexec_segment *kernel_segment;
struct loongarch_image_header *h;
h = (struct loongarch_image_header *)kernel;
if (!h->kernel_asize)
return ERR_PTR(-EINVAL);
/*
* Load the kernel
* FIXME: Non-relocatable kernel rejected for kexec_file (require CONFIG_RELOCATABLE)
*/
kbuf.image = image;
kbuf.buf_max = ULONG_MAX;
kbuf.top_down = false;
kbuf.buffer = kernel;
kbuf.bufsz = kernel_len;
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
kbuf.memsz = le64_to_cpu(h->kernel_asize);
text_offset = le64_to_cpu(h->text_offset);
kbuf.buf_min = text_offset;
kbuf.buf_align = SZ_2M;
kernel_segment_number = image->nr_segments;
/*
* The location of the kernel segment may make it impossible to
* satisfy the other segment requirements, so we try repeatedly
* to find a location that will work.
*/
while ((ret = kexec_add_buffer(&kbuf)) == 0) {
/* Try to load additional data */
kernel_segment = &image->segment[kernel_segment_number];
ret = load_other_segments(image, kernel_segment->mem,
kernel_segment->memsz, initrd,
initrd_len, cmdline, cmdline_len);
if (!ret)
break;
/*
* We couldn't find space for the other segments; erase the
* kernel segment and try the next available hole.
*/
image->nr_segments -= 1;
kbuf.buf_min = kernel_segment->mem + kernel_segment->memsz;
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
}
if (ret < 0) {
pr_err("Could not find any suitable kernel location!");
return ERR_PTR(ret);
}
kernel_segment = &image->segment[kernel_segment_number];
/* Make sure the second kernel jumps to the correct "kernel_entry" */
image->start = kernel_segment->mem + h->kernel_entry - text_offset;
kexec_dprintk("Loaded kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
kernel_segment->mem, kbuf.bufsz, kernel_segment->memsz);
return NULL;
}
const struct kexec_file_ops kexec_efi_ops = {
.probe = efi_kexec_probe,
.load = efi_kexec_load,
};
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