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// SPDX-License-Identifier: GPL-2.0
/*
* kexec_file for LoongArch
*
* Author: Youling Tang <tangyouling@kylinos.cn>
* Copyright (C) 2025 KylinSoft Corporation.
*
* Most code is derived from LoongArch port of kexec-tools
*/
#define pr_fmt(fmt) "kexec_file: " fmt
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/kexec.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/vmalloc.h>
#include <asm/bootinfo.h>
const struct kexec_file_ops * const kexec_file_loaders[] = {
&kexec_efi_ops,
NULL
};
int arch_kimage_file_post_load_cleanup(struct kimage *image)
{
vfree(image->elf_headers);
image->elf_headers = NULL;
image->elf_headers_sz = 0;
return kexec_image_post_load_cleanup_default(image);
}
/* Add the "kexec_file" command line parameter to command line. */
static void cmdline_add_loader(unsigned long *cmdline_tmplen, char *modified_cmdline)
{
int loader_strlen;
loader_strlen = sprintf(modified_cmdline + (*cmdline_tmplen), "kexec_file ");
*cmdline_tmplen += loader_strlen;
}
/* Add the "initrd=start,size" command line parameter to command line. */
static void cmdline_add_initrd(struct kimage *image, unsigned long *cmdline_tmplen,
char *modified_cmdline, unsigned long initrd)
{
int initrd_strlen;
initrd_strlen = sprintf(modified_cmdline + (*cmdline_tmplen), "initrd=0x%lx,0x%lx ",
initrd, image->initrd_buf_len);
*cmdline_tmplen += initrd_strlen;
}
/*
* Try to add the initrd to the image. If it is not possible to find valid
* locations, this function will undo changes to the image and return non zero.
*/
int load_other_segments(struct kimage *image,
unsigned long kernel_load_addr, unsigned long kernel_size,
char *initrd, unsigned long initrd_len, char *cmdline, unsigned long cmdline_len)
{
int ret = 0;
unsigned long cmdline_tmplen = 0;
unsigned long initrd_load_addr = 0;
unsigned long orig_segments = image->nr_segments;
char *modified_cmdline = NULL;
struct kexec_buf kbuf;
kbuf.image = image;
/* Don't allocate anything below the kernel */
kbuf.buf_min = kernel_load_addr + kernel_size;
modified_cmdline = kzalloc(COMMAND_LINE_SIZE, GFP_KERNEL);
if (!modified_cmdline)
return -EINVAL;
cmdline_add_loader(&cmdline_tmplen, modified_cmdline);
/* Ensure it's null terminated */
modified_cmdline[COMMAND_LINE_SIZE - 1] = '\0';
/* Load initrd */
if (initrd) {
kbuf.buffer = initrd;
kbuf.bufsz = initrd_len;
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
kbuf.memsz = initrd_len;
kbuf.buf_align = 0;
/* within 1GB-aligned window of up to 32GB in size */
kbuf.buf_max = round_down(kernel_load_addr, SZ_1G) + (unsigned long)SZ_1G * 32;
kbuf.top_down = false;
ret = kexec_add_buffer(&kbuf);
if (ret < 0)
goto out_err;
initrd_load_addr = kbuf.mem;
kexec_dprintk("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
initrd_load_addr, kbuf.bufsz, kbuf.memsz);
/* Add the initrd=start,size parameter to the command line */
cmdline_add_initrd(image, &cmdline_tmplen, modified_cmdline, initrd_load_addr);
}
if (cmdline_len + cmdline_tmplen > COMMAND_LINE_SIZE) {
pr_err("Appending command line exceeds COMMAND_LINE_SIZE\n");
ret = -EINVAL;
goto out_err;
}
memcpy(modified_cmdline + cmdline_tmplen, cmdline, cmdline_len);
cmdline = modified_cmdline;
image->arch.cmdline_ptr = (unsigned long)cmdline;
return 0;
out_err:
image->nr_segments = orig_segments;
kfree(modified_cmdline);
return ret;
}
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