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/*
* kexec-elf-mips.c - kexec Elf loader for mips
* Copyright (C) 2007 Francesco Chiechi, Alessandro Rubini
* Copyright (C) 2007 Tvblob s.r.l.
*
* derived from ../ppc/kexec-elf-ppc.c
* Copyright (C) 2004 Albert Herranz
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <elf.h>
#include <boot/elf_boot.h>
#include <ip_checksum.h>
#include "../../kexec.h"
#include "../../kexec-elf.h"
#include "../../kexec-syscall.h"
#include "kexec-mips.h"
#include "crashdump-mips.h"
#include <arch/options.h>
#include "../../fs2dt.h"
#include "../../dt-ops.h"
static const int probe_debug = 0;
#define BOOTLOADER "kexec"
#define UPSZ(X) _ALIGN_UP(sizeof(X), 4)
#define CMDLINE_PREFIX "kexec "
static char cmdline_buf[COMMAND_LINE_SIZE] = CMDLINE_PREFIX;
int elf_mips_probe(const char *buf, off_t len)
{
struct mem_ehdr ehdr;
int result;
result = build_elf_exec_info(buf, len, &ehdr, 0);
if (result < 0) {
goto out;
}
/* Verify the architecuture specific bits */
if (ehdr.e_machine != EM_MIPS) {
/* for a different architecture */
if (probe_debug) {
fprintf(stderr, "Not for this architecture.\n");
}
result = -1;
goto out;
}
result = 0;
out:
free_elf_info(&ehdr);
return result;
}
void elf_mips_usage(void)
{
}
int elf_mips_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info)
{
struct mem_ehdr ehdr;
int command_line_len = 0;
char *crash_cmdline;
int result;
unsigned long cmdline_addr;
size_t i;
off_t dtb_length;
char *dtb_buf;
char *initrd_buf = NULL;
unsigned long long kernel_addr = 0, kernel_size = 0;
unsigned long pagesize = getpagesize();
/* Need to append some command line parameters internally in case of
* taking crash dumps.
*/
if (info->kexec_flags & KEXEC_ON_CRASH) {
crash_cmdline = xmalloc(COMMAND_LINE_SIZE);
memset((void *)crash_cmdline, 0, COMMAND_LINE_SIZE);
} else
crash_cmdline = NULL;
result = build_elf_exec_info(buf, len, &ehdr, 0);
if (result < 0)
die("ELF exec parse failed\n");
/* Read in the PT_LOAD segments and remove CKSEG0 mask from address*/
for (i = 0; i < ehdr.e_phnum; i++) {
struct mem_phdr *phdr;
phdr = &ehdr.e_phdr[i];
if (phdr->p_type == PT_LOAD) {
phdr->p_paddr = virt_to_phys(phdr->p_paddr);
kernel_addr = phdr->p_paddr;
kernel_size = phdr->p_memsz;
}
}
/* Load the Elf data */
result = elf_exec_load(&ehdr, info);
if (result < 0)
die("ELF exec load failed\n");
info->entry = (void *)virt_to_phys(ehdr.e_entry);
if (arch_options.command_line)
command_line_len = strlen(arch_options.command_line) + 1;
if (info->kexec_flags & KEXEC_ON_CRASH) {
result = load_crashdump_segments(info, crash_cmdline,
0, 0);
if (result < 0) {
free(crash_cmdline);
return -1;
}
}
if (arch_options.command_line)
strncat(cmdline_buf, arch_options.command_line, command_line_len);
if (crash_cmdline)
{
strncat(cmdline_buf, crash_cmdline,
sizeof(crash_cmdline) -
strlen(crash_cmdline) - 1);
free(crash_cmdline);
}
if (info->kexec_flags & KEXEC_ON_CRASH)
/* In case of crashdump segment[0] is kernel.
* Put cmdline just after it. */
cmdline_addr = (unsigned long)info->segment[0].mem +
info->segment[0].memsz;
else
cmdline_addr = 0;
/* MIPS systems that have been converted to use device tree
* passed through UHI will use commandline in the DTB and
* the DTB passed as a separate buffer. Note that
* CMDLINE_PREFIX is skipped here intentionally, as it is
* used only in the legacy method */
if (arch_options.dtb_file) {
dtb_buf = slurp_file(arch_options.dtb_file, &dtb_length);
} else {
create_flatten_tree(&dtb_buf, &dtb_length, cmdline_buf + strlen(CMDLINE_PREFIX));
}
if (arch_options.initrd_file) {
initrd_buf = slurp_file(arch_options.initrd_file, &initrd_size);
/* Create initrd entries in dtb - although at this time
* they would not point to the correct location */
dtb_set_initrd(&dtb_buf, &dtb_length, (off_t)initrd_buf, (off_t)initrd_buf + initrd_size);
initrd_base = add_buffer(info, initrd_buf, initrd_size,
initrd_size, sizeof(void *),
_ALIGN_UP(kernel_addr + kernel_size + dtb_length,
pagesize), 0x0fffffff, 1);
/* Now that the buffer for initrd is prepared, update the dtb
* with an appropriate location */
dtb_set_initrd(&dtb_buf, &dtb_length, initrd_base, initrd_base + initrd_size);
}
/* This is a legacy method for commandline passing used
* currently by Octeon CPUs only */
add_buffer(info, cmdline_buf, sizeof(cmdline_buf),
sizeof(cmdline_buf), sizeof(void *),
cmdline_addr, 0x0fffffff, 1);
add_buffer(info, dtb_buf, dtb_length, dtb_length, 0,
_ALIGN_UP(kernel_addr + kernel_size, pagesize),
0x0fffffff, 1);
return 0;
}
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