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/*
* kexec: Linux boots Linux
*
* Copyright (C) 2003-2005 Eric Biederman (ebiederm@xmission.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation (version 2 of the License).
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stddef.h>
#include <stdio.h>
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <limits.h>
#include <stdlib.h>
#include "../../kexec.h"
#include "../../kexec-syscall.h"
#include "../../firmware_memmap.h"
#include "kexec-x86.h"
static struct memory_range memory_range[MAX_MEMORY_RANGES];
/**
* The old /proc/iomem parsing code.
*
* @param[out] range pointer that will be set to an array that holds the
* memory ranges
* @param[out] ranges number of ranges valid in @p range
*
* @return 0 on success, any other value on failure.
*/
static int get_memory_ranges_proc_iomem(struct memory_range **range, int *ranges)
{
const char *iomem= proc_iomem();
int memory_ranges = 0;
char line[MAX_LINE];
FILE *fp;
fp = fopen(iomem, "r");
if (!fp) {
fprintf(stderr, "Cannot open %s: %s\n",
iomem, strerror(errno));
return -1;
}
while(fgets(line, sizeof(line), fp) != 0) {
unsigned long long start, end;
char *str;
int type;
int consumed;
int count;
if (memory_ranges >= MAX_MEMORY_RANGES)
break;
count = sscanf(line, "%Lx-%Lx : %n",
&start, &end, &consumed);
if (count != 2)
continue;
str = line + consumed;
end = end + 1;
#if 0
printf("%016Lx-%016Lx : %s",
start, end, str);
#endif
if (memcmp(str, "System RAM\n", 11) == 0) {
type = RANGE_RAM;
}
else if (memcmp(str, "reserved\n", 9) == 0) {
type = RANGE_RESERVED;
}
else if (memcmp(str, "ACPI Tables\n", 12) == 0) {
type = RANGE_ACPI;
}
else if (memcmp(str, "ACPI Non-volatile Storage\n", 26) == 0) {
type = RANGE_ACPI_NVS;
}
else {
continue;
}
memory_range[memory_ranges].start = start;
memory_range[memory_ranges].end = end;
memory_range[memory_ranges].type = type;
#if 0
printf("%016Lx-%016Lx : %x\n",
start, end, type);
#endif
memory_ranges++;
}
fclose(fp);
*range = memory_range;
*ranges = memory_ranges;
return 0;
}
/**
* Calls the architecture independent get_firmware_memmap_ranges() to parse
* /sys/firmware/memmap and then do some x86 only modifications.
*
* @param[out] range pointer that will be set to an array that holds the
* memory ranges
* @param[out] ranges number of ranges valid in @p range
*
* @return 0 on success, any other value on failure.
*/
static int get_memory_ranges_sysfs(struct memory_range **range, int *ranges)
{
int ret;
size_t range_number = MAX_MEMORY_RANGES;
ret = get_firmware_memmap_ranges(memory_range, &range_number);
if (ret != 0) {
fprintf(stderr, "Parsing the /sys/firmware memory map failed. "
"Falling back to /proc/iomem.\n");
return get_memory_ranges_proc_iomem(range, ranges);
}
*range = memory_range;
*ranges = range_number;
return 0;
}
/**
* Return a sorted list of memory ranges.
*
* If we have the /sys/firmware/memmap interface, then use that. If not,
* or if parsing of that fails, use /proc/iomem as fallback.
*
* @param[out] range pointer that will be set to an array that holds the
* memory ranges
* @param[out] ranges number of ranges valid in @p range
* @param[in] kexec_flags the kexec_flags to determine if we load a normal
* or a crashdump kernel
*
* @return 0 on success, any other value on failure.
*/
int get_memory_ranges(struct memory_range **range, int *ranges,
unsigned long kexec_flags)
{
int ret, i;
if (have_sys_firmware_memmap())
ret = get_memory_ranges_sysfs(range, ranges);
else
ret = get_memory_ranges_proc_iomem(range, ranges);
/*
* both get_memory_ranges_sysfs() and get_memory_ranges_proc_iomem()
* have already printed an error message, so fail silently here
*/
if (ret != 0)
return ret;
/* Don't report the interrupt table as ram */
for (i = 0; i < *ranges; i++) {
if ((*range)[i].type == RANGE_RAM &&
((*range)[i].start < 0x100)) {
(*range)[i].start = 0x100;
break;
}
}
/*
* Redefine the memory region boundaries if kernel
* exports the limits and if it is panic kernel.
* Override user values only if kernel exported values are
* subset of user defined values.
*/
if ((kexec_flags & KEXEC_ON_CRASH) &&
!(kexec_flags & KEXEC_PRESERVE_CONTEXT)) {
unsigned long long start, end;
ret = parse_iomem_single("Crash kernel\n", &start, &end);
if (ret != 0) {
fprintf(stderr, "parse_iomem_single failed.\n");
return -1;
}
if (start > mem_min)
mem_min = start;
if (end < mem_max)
mem_max = end;
}
/* just set 0 to 1 to enable printing for debugging */
#if 0
{
int i;
printf("MEMORY RANGES\n");
for (i = 0; i < *ranges; i++) {
printf("%016Lx-%016Lx (%d)\n", (*range)[i].start,
(*range)[i].end, (*range)[i].type);
}
}
#endif
return ret;
}
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