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/*
* kexec-zImage-sh.c - kexec zImage loader for the SH
* Copyright (C) 2005 kogiidena@eggplant.ddo.jp
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#define _GNU_SOURCE
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <stdint.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 <arch/options.h>
#include "kexec-sh.h"
static const int probe_debug = 0;
#define HEAD32_KERNEL_START_ADDR 0
#define HEAD32_DECOMPRESS_KERNEL_ADDR 1
#define HEAD32_INIT_STACK_ADDR 2
#define HEAD32_INIT_SR 3
#define HEAD32_INIT_SR_VALUE 0x400000F0
static unsigned long zImage_head32(const char *buf, int offs)
{
unsigned long *values = (void *)buf;
int k;
for (k = (0x200 / 4) - 1; k > 0; k--)
if (values[k] != 0x00090009) /* not nop + nop padding*/
return values[k - offs];
return 0;
}
/*
* zImage_sh_probe - sanity check the elf image
*
* Make sure that the file image has a reasonable chance of working.
*/
int zImage_sh_probe(const char *buf, off_t UNUSED(len))
{
if (memcmp(&buf[0x202], "HdrS", 4) != 0)
return -1;
if (zImage_head32(buf, HEAD32_INIT_SR) != HEAD32_INIT_SR_VALUE)
return -1;
return 0;
}
void zImage_sh_usage(void)
{
printf(
" --append=STRING Set the kernel command line to STRING.\n"
" --empty-zero=ADDRESS Set the kernel top ADDRESS. \n\n");
}
int zImage_sh_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info)
{
char *command_line;
int opt;
unsigned long empty_zero, zero_page_base, zero_page_size, k;
unsigned long image_base;
char *param;
static const struct option options[] = {
KEXEC_ARCH_OPTIONS
{0, 0, 0, 0},
};
static const char short_options[] = KEXEC_ARCH_OPT_STR "";
command_line = 0;
while ((opt = getopt_long(argc, argv, short_options, options, 0)) != -1) {
switch (opt) {
default:
/* Ignore core options */
if (opt < OPT_ARCH_MAX) {
break;
}
case OPT_APPEND:
command_line = optarg;
break;
}
}
if (!command_line)
command_line = get_append();
/* assume the zero page is the page before the vmlinux entry point.
* we don't know the page size though, but 64k seems to be max.
* put several 4k zero page copies before the entry point to cover
* all combinations.
*/
empty_zero = zImage_head32(buf, HEAD32_KERNEL_START_ADDR);
zero_page_size = 0x10000;
zero_page_base = virt_to_phys(empty_zero - zero_page_size);
while (!valid_memory_range(info, zero_page_base,
zero_page_base + zero_page_size - 1)) {
zero_page_base += 0x1000;
zero_page_size -= 0x1000;
if (zero_page_size == 0)
die("Unable to determine zero page size from %p \n",
(void *)empty_zero);
}
param = xmalloc(zero_page_size);
for (k = 0; k < (zero_page_size / 0x1000); k++)
kexec_sh_setup_zero_page(param + (k * 0x1000), 0x1000,
command_line);
add_segment(info, param, zero_page_size,
0x80000000 | zero_page_base, zero_page_size);
/* load image a bit above the zero page, round up to 64k
* the zImage will relocate itself, but only up seems supported.
*/
image_base = _ALIGN(empty_zero, 0x10000);
add_segment(info, buf, len, image_base, len);
info->entry = (void *)virt_to_phys(image_base);
return 0;
}
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