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// SPDX-License-Identifier: GPL-2.0
/*
* RISC-V Kexec image loader
*
*/
#define pr_fmt(fmt) "kexec_file(Image): " 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/image.h>
static int image_probe(const char *kernel_buf, unsigned long kernel_len)
{
const struct riscv_image_header *h = (const struct riscv_image_header *)kernel_buf;
if (!h || kernel_len < sizeof(*h))
return -EINVAL;
/* According to Documentation/riscv/boot-image-header.rst,
* use "magic2" field to check when version >= 0.2.
*/
if (h->version >= RISCV_HEADER_VERSION &&
memcmp(&h->magic2, RISCV_IMAGE_MAGIC2, sizeof(h->magic2)))
return -EINVAL;
return 0;
}
static void *image_load(struct kimage *image,
char *kernel, unsigned long kernel_len,
char *initrd, unsigned long initrd_len,
char *cmdline, unsigned long cmdline_len)
{
struct riscv_image_header *h;
u64 flags;
bool be_image, be_kernel;
struct kexec_buf kbuf;
int ret;
/* Check Image header */
h = (struct riscv_image_header *)kernel;
if (!h->image_size) {
ret = -EINVAL;
goto out;
}
/* Check endianness */
flags = le64_to_cpu(h->flags);
be_image = riscv_image_flag_field(flags, RISCV_IMAGE_FLAG_BE);
be_kernel = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
if (be_image != be_kernel) {
ret = -EINVAL;
goto out;
}
/* Load the kernel image */
kbuf.image = image;
kbuf.buf_min = 0;
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->image_size);
kbuf.buf_align = le64_to_cpu(h->text_offset);
ret = kexec_add_buffer(&kbuf);
if (ret) {
pr_err("Error add kernel image ret=%d\n", ret);
goto out;
}
image->start = kbuf.mem;
pr_info("Loaded kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
kbuf.mem, kbuf.bufsz, kbuf.memsz);
ret = load_extra_segments(image, kbuf.mem, kbuf.memsz,
initrd, initrd_len, cmdline, cmdline_len);
out:
return ret ? ERR_PTR(ret) : NULL;
}
const struct kexec_file_ops image_kexec_ops = {
.probe = image_probe,
.load = image_load,
};
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