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// SPDX-License-Identifier: GPL-2.0
/*
* kexec_file for arm64
*
* Copyright (C) 2018 Linaro Limited
* Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
*
* Most code is derived from arm64 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/libfdt.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/vmalloc.h>
const struct kexec_file_ops * const kexec_file_loaders[] = {
&kexec_image_ops,
NULL
};
int arch_kimage_file_post_load_cleanup(struct kimage *image)
{
kvfree(image->arch.dtb);
image->arch.dtb = NULL;
vfree(image->elf_headers);
image->elf_headers = NULL;
image->elf_headers_sz = 0;
return kexec_image_post_load_cleanup_default(image);
}
static int prepare_elf_headers(void **addr, unsigned long *sz)
{
struct crash_mem *cmem;
unsigned int nr_ranges;
int ret;
u64 i;
phys_addr_t start, end;
nr_ranges = 2; /* for exclusion of crashkernel region */
for_each_mem_range(i, &start, &end)
nr_ranges++;
cmem = kmalloc(struct_size(cmem, ranges, nr_ranges), GFP_KERNEL);
if (!cmem)
return -ENOMEM;
cmem->max_nr_ranges = nr_ranges;
cmem->nr_ranges = 0;
for_each_mem_range(i, &start, &end) {
cmem->ranges[cmem->nr_ranges].start = start;
cmem->ranges[cmem->nr_ranges].end = end - 1;
cmem->nr_ranges++;
}
/* Exclude crashkernel region */
ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);
if (ret)
goto out;
if (crashk_low_res.end) {
ret = crash_exclude_mem_range(cmem, crashk_low_res.start, crashk_low_res.end);
if (ret)
goto out;
}
ret = crash_prepare_elf64_headers(cmem, true, addr, sz);
out:
kfree(cmem);
return ret;
}
/*
* Tries to add the initrd and DTB 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)
{
struct kexec_buf kbuf;
void *headers, *dtb = NULL;
unsigned long headers_sz, initrd_load_addr = 0, dtb_len,
orig_segments = image->nr_segments;
int ret = 0;
kbuf.image = image;
/* not allocate anything below the kernel */
kbuf.buf_min = kernel_load_addr + kernel_size;
/* load elf core header */
if (image->type == KEXEC_TYPE_CRASH) {
ret = prepare_elf_headers(&headers, &headers_sz);
if (ret) {
pr_err("Preparing elf core header failed\n");
goto out_err;
}
kbuf.buffer = headers;
kbuf.bufsz = headers_sz;
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
kbuf.memsz = headers_sz;
kbuf.buf_align = SZ_64K; /* largest supported page size */
kbuf.buf_max = ULONG_MAX;
kbuf.top_down = true;
ret = kexec_add_buffer(&kbuf);
if (ret) {
vfree(headers);
goto out_err;
}
image->elf_headers = headers;
image->elf_load_addr = kbuf.mem;
image->elf_headers_sz = headers_sz;
pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
}
/* 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)
goto out_err;
initrd_load_addr = kbuf.mem;
pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
initrd_load_addr, kbuf.bufsz, kbuf.memsz);
}
/* load dtb */
dtb = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr,
initrd_len, cmdline, 0);
if (!dtb) {
pr_err("Preparing for new dtb failed\n");
ret = -EINVAL;
goto out_err;
}
/* trim it */
fdt_pack(dtb);
dtb_len = fdt_totalsize(dtb);
kbuf.buffer = dtb;
kbuf.bufsz = dtb_len;
kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
kbuf.memsz = dtb_len;
/* not across 2MB boundary */
kbuf.buf_align = SZ_2M;
kbuf.buf_max = ULONG_MAX;
kbuf.top_down = true;
ret = kexec_add_buffer(&kbuf);
if (ret)
goto out_err;
image->arch.dtb = dtb;
image->arch.dtb_mem = kbuf.mem;
pr_debug("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
kbuf.mem, kbuf.bufsz, kbuf.memsz);
return 0;
out_err:
image->nr_segments = orig_segments;
kvfree(dtb);
return ret;
}
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