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/*
* kexec/arch/s390/kexec-image.c
*
* (C) Copyright IBM Corp. 2005
*
* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
* Heiko Carstens <heiko.carstens@de.ibm.com>
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <getopt.h>
#include "../../kexec.h"
#include "../../kexec-syscall.h"
#include "../../kexec/crashdump.h"
#include "kexec-s390.h"
#include <arch/options.h>
#include <fcntl.h>
static uint64_t crash_base, crash_end;
static void add_segment_check(struct kexec_info *info, const void *buf,
size_t bufsz, unsigned long base, size_t memsz)
{
if (info->kexec_flags & KEXEC_ON_CRASH)
if (base + memsz > crash_end - crash_base)
die("Not enough crashkernel memory to load segments\n");
add_segment(info, buf, bufsz, crash_base + base, memsz);
}
int command_line_add(struct kexec_info *info, const char *str)
{
char *tmp = NULL;
tmp = concat_cmdline(info->command_line, str);
if (!tmp) {
fprintf(stderr, "out of memory\n");
return -1;
}
free(info->command_line);
info->command_line = tmp;
return 0;
}
int image_s390_load_file(int argc, char **argv, struct kexec_info *info)
{
const char *ramdisk = NULL;
int opt;
static const struct option options[] =
{
KEXEC_ALL_OPTIONS
{0, 0, 0, 0},
};
static const char short_options[] = KEXEC_OPT_STR "";
while ((opt = getopt_long(argc, argv, short_options, options, 0)) != -1) {
switch(opt) {
case OPT_APPEND:
if (command_line_add(info, optarg))
return -1;
break;
case OPT_RAMDISK:
ramdisk = optarg;
break;
case OPT_REUSE_CMDLINE:
free(info->command_line);
info->command_line = get_command_line();
break;
}
}
if (ramdisk) {
info->initrd_fd = open(ramdisk, O_RDONLY);
if (info->initrd_fd == -1) {
fprintf(stderr, "Could not open initrd file %s:%s\n",
ramdisk, strerror(errno));
free(info->command_line);
info->command_line = NULL;
return -1;
}
}
if (info->command_line)
info->command_line_len = strlen(info->command_line) + 1;
else
info->command_line_len = 0;
return 0;
}
int
image_s390_load(int argc, char **argv, const char *kernel_buf,
off_t kernel_size, struct kexec_info *info)
{
void *krnl_buffer;
char *rd_buffer;
const char *ramdisk;
off_t ramdisk_len;
unsigned int ramdisk_origin;
int opt, ret = -1;
if (info->file_mode)
return image_s390_load_file(argc, argv, info);
static const struct option options[] =
{
KEXEC_ALL_OPTIONS
{0, 0, 0, 0},
};
static const char short_options[] = KEXEC_OPT_STR "";
ramdisk = NULL;
ramdisk_len = 0;
ramdisk_origin = 0;
while ((opt = getopt_long(argc,argv,short_options,options,0)) != -1) {
switch(opt) {
case OPT_APPEND:
if (command_line_add(info, optarg))
return -1;
break;
case OPT_REUSE_CMDLINE:
free(info->command_line);
info->command_line = get_command_line();
break;
case OPT_RAMDISK:
ramdisk = optarg;
break;
}
}
if (info->kexec_flags & KEXEC_ON_CRASH) {
if (parse_iomem_single("Crash kernel\n", &crash_base,
&crash_end))
goto out;
}
/* Add kernel segment */
add_segment_check(info, kernel_buf + IMAGE_READ_OFFSET,
kernel_size - IMAGE_READ_OFFSET, IMAGE_READ_OFFSET,
kernel_size - IMAGE_READ_OFFSET);
/* We do want to change the kernel image */
krnl_buffer = (void *) kernel_buf + IMAGE_READ_OFFSET;
/*
* Load ramdisk if present: If image is larger than RAMDISK_ORIGIN_ADDR,
* we load the ramdisk directly behind the image with 1 MiB alignment.
*/
if (ramdisk) {
rd_buffer = slurp_file_mmap(ramdisk, &ramdisk_len);
if (rd_buffer == NULL) {
fprintf(stderr, "Could not read ramdisk.\n");
goto out;
}
ramdisk_origin = MAX(RAMDISK_ORIGIN_ADDR, kernel_size);
ramdisk_origin = _ALIGN_UP(ramdisk_origin, 0x100000);
add_segment_check(info, rd_buffer, ramdisk_len,
ramdisk_origin, ramdisk_len);
}
if (info->kexec_flags & KEXEC_ON_CRASH) {
if (load_crashdump_segments(info, crash_base, crash_end))
goto out;
} else {
info->entry = (void *) IMAGE_READ_OFFSET;
}
/* Register the ramdisk and crashkernel memory in the kernel. */
{
unsigned long long *tmp;
tmp = krnl_buffer + INITRD_START_OFFS;
*tmp = (unsigned long long) ramdisk_origin;
tmp = krnl_buffer + INITRD_SIZE_OFFS;
*tmp = (unsigned long long) ramdisk_len;
if (info->kexec_flags & KEXEC_ON_CRASH) {
tmp = krnl_buffer + OLDMEM_BASE_OFFS;
*tmp = crash_base;
tmp = krnl_buffer + OLDMEM_SIZE_OFFS;
*tmp = crash_end - crash_base + 1;
}
}
if (info->command_line) {
unsigned long maxsize;
char *dest = krnl_buffer + COMMAND_LINE_OFFS;
maxsize = *(unsigned long *)(krnl_buffer + MAX_COMMAND_LINESIZE_OFFS);
if (!maxsize)
maxsize = LEGACY_COMMAND_LINESIZE;
if (strlen(info->command_line) > maxsize-1) {
fprintf(stderr, "command line too long, maximum allowed size %ld\n",
maxsize-1);
goto out;
}
strncpy(dest, info->command_line, maxsize-1);
dest[maxsize-1] = '\0';
}
ret = 0;
out:
free(info->command_line);
info->command_line = NULL;
return ret;
}
int
image_s390_probe(const char *UNUSED(kernel_buf), off_t UNUSED(kernel_size))
{
/*
* Can't reliably tell if an image is valid,
* therefore everything is valid.
*/
return 0;
}
void
image_s390_usage(void)
{
printf("--command-line=STRING Set the kernel command line to STRING.\n"
"--append=STRING Set the kernel command line to STRING.\n"
"--initrd=FILENAME Use the file FILENAME as a ramdisk.\n"
"--reuse-cmdline Use kernel command line from running system.\n"
);
}
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