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/*
* kexec/arch/s390/kexec-s390.c
*
* Copyright IBM Corp. 2005,2011
*
* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
* Michael Holzheu <holzheu@linux.vnet.ibm.com>
*
*/
#define _GNU_SOURCE
#include <stddef.h>
#include <stdio.h>
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <getopt.h>
#include "../../kexec.h"
#include "../../kexec-syscall.h"
#include "kexec-s390.h"
#include <arch/options.h>
static struct memory_range memory_range[MAX_MEMORY_RANGES];
/*
* Get memory ranges of type "System RAM" from /proc/iomem. If with_crashk=1
* then also type "Crash kernel" is added.
*/
int get_memory_ranges_s390(struct memory_range memory_range[], int *ranges,
int with_crashk)
{
char crash_kernel[] = "Crash kernel\n";
char sys_ram[] = "System RAM\n";
const char *iomem = proc_iomem();
FILE *fp;
char line[80];
int current_range = 0;
fp = fopen(iomem,"r");
if(fp == 0) {
fprintf(stderr,"Unable to open %s: %s\n",iomem,strerror(errno));
return -1;
}
/* Setup the compare string properly. */
while (fgets(line, sizeof(line), fp) != 0) {
unsigned long long start, end;
int cons;
char *str;
if (current_range == MAX_MEMORY_RANGES)
break;
sscanf(line,"%Lx-%Lx : %n", &start, &end, &cons);
str = line+cons;
if ((memcmp(str, sys_ram, strlen(sys_ram)) == 0) ||
((memcmp(str, crash_kernel, strlen(crash_kernel)) == 0) &&
with_crashk)) {
memory_range[current_range].start = start;
memory_range[current_range].end = end;
memory_range[current_range].type = RANGE_RAM;
current_range++;
}
else {
continue;
}
}
fclose(fp);
*ranges = current_range;
return 0;
}
/*
* get_memory_ranges:
* Return a list of memory ranges by parsing the file returned by
* proc_iomem()
*
* INPUT:
* - Pointer to an array of memory_range structures.
* - Pointer to an integer with holds the number of memory ranges.
*
* RETURN:
* - 0 on normal execution.
* - (-1) if something went wrong.
*/
int get_memory_ranges(struct memory_range **range, int *ranges,
unsigned long flags)
{
uint64_t start, end;
if (get_memory_ranges_s390(memory_range, ranges,
flags & KEXEC_ON_CRASH))
return -1;
*range = memory_range;
if ((flags & KEXEC_ON_CRASH) && !(flags & KEXEC_PRESERVE_CONTEXT)) {
if (parse_iomem_single("Crash kernel\n", &start, &end))
return -1;
if (start > mem_min)
mem_min = start;
if (end < mem_max)
mem_max = end;
}
return 0;
}
/* Supported file types and callbacks */
struct file_type file_type[] = {
{ "image", image_s390_probe, image_s390_load, image_s390_usage},
};
int file_types = sizeof(file_type) / sizeof(file_type[0]);
void arch_usage(void)
{
}
int arch_process_options(int UNUSED(argc), char **UNUSED(argv))
{
return 0;
}
const struct arch_map_entry arches[] = {
{ "s390", KEXEC_ARCH_S390 },
{ "s390x", KEXEC_ARCH_S390 },
{ NULL, 0 },
};
int arch_compat_trampoline(struct kexec_info *UNUSED(info))
{
return 0;
}
void arch_update_purgatory(struct kexec_info *UNUSED(info))
{
}
int is_crashkernel_mem_reserved(void)
{
uint64_t start, end;
return parse_iomem_single("Crash kernel\n", &start, &end) == 0 ?
(start != end) : 0;
}
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