static int get_crash_memory_ranges(int *ranges)
{
const char *iomem = proc_iomem();
char line[MAX_LINE];
FILE *fp;
unsigned long start, end;
crash_memory_range = xmalloc(sizeof(struct memory_range) *
max_memory_ranges);
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) {
char *str;
int type, consumed, count;
if (memory_ranges >= max_memory_ranges)
break;
count = sscanf(line, "%lx-%lx : %n",
&start, &end, &consumed);
str = line + consumed;
if (count != 2)
continue;
if (memcmp(str, "System RAM\n", 11) == 0) {
type = RANGE_RAM;
} else if (memcmp(str, "Crash kernel\n", 13) == 0) {
/* Reserved memory region. New kernel can
* use this region to boot into. */
crash_reserved_mem.start = start;
crash_reserved_mem.end = end;
crash_reserved_mem.type = RANGE_RAM;
continue;
}
else if (memcmp(str, "Kernel code\n", 12) == 0) {
kernel_code_start = start;
kernel_code_end = end;
continue;
} else if (memcmp(str, "Uncached RAM\n", 13) == 0) {
type = RANGE_UNCACHED;
} else {
continue;
}
crash_memory_range[memory_ranges].start = start;
crash_memory_range[memory_ranges].end = end;
crash_memory_range[memory_ranges].type = type;
memory_ranges++;
}
fclose(fp);
if (exclude_crash_reserve_region(&memory_ranges) < 0)
return -1;
*ranges = memory_ranges;
return 0;
}
/* Removes crash reserve region from list of memory chunks for whom elf program
* headers have to be created. Assuming crash reserve region to be a single
* continuous area fully contained inside one of the memory chunks */
static int exclude_crash_reserve_region(int *nr_ranges)
{
int i, j, tidx = -1;
unsigned long long cstart, cend;
struct memory_range temp_region = {
.start = 0,
.end = 0
};
/* Crash reserved region. */
cstart = crash_reserved_mem.start;
cend = crash_reserved_mem.end;
for (i = 0; i < (*nr_ranges); i++) {
unsigned long long mstart, mend;
mstart = crash_memory_range[i].start;
mend = crash_memory_range[i].end;
if (cstart < mend && cend > mstart) {
if (cstart != mstart && cend != mend) {
/* Split memory region */
crash_memory_range[i].end = cstart - 1;
temp_region.start = cend + 1;
temp_region.end = mend;
temp_region.type = RANGE_RAM;
tidx = i+1;
} else if (cstart != mstart)
crash_memory_range[i].end = cstart - 1;
else
crash_memory_range[i].start = cend + 1;
}
}
/* Insert split memory region, if any. */
if (tidx >= 0) {
if (*nr_ranges == CRASH_MAX_MEMORY_RANGES) {
/* No space to insert another element. */
fprintf(stderr, "Error: Number of crash memory ranges"
" excedeed the max limit\n");
return -1;
}
for (j = (*nr_ranges - 1); j >= tidx; j--)
crash_memory_range[j+1] = crash_memory_range[j];
crash_memory_range[tidx].start = temp_region.start;
crash_memory_range[tidx].end = temp_region.end;
crash_memory_range[tidx].type = temp_region.type;
(*nr_ranges)++;
}
return 0;
}
/* Reads the appropriate file and retrieves the SYSTEM RAM regions for whom to
* create Elf headers. Keeping it separate from get_memory_ranges() as
* requirements are different in the case of normal kexec and crashdumps.
*
* Normal kexec needs to look at all of available physical memory irrespective
* of the fact how much of it is being used by currently running kernel.
* Crashdumps need to have access to memory regions actually being used by
* running kernel. Expecting a different file/data structure than /proc/iomem
* to look into down the line. May be something like /proc/kernelmem or may
* be zone data structures exported from kernel.
*/
static int get_crash_memory_ranges(struct memory_range **range, int *ranges)
{
const char iomem[] = "/proc/iomem";
int i, memory_ranges = 0;
char line[MAX_LINE];
FILE *fp;
unsigned long long start, end;
fp = fopen(iomem, "r");
if (!fp) {
fprintf(stderr, "Cannot open %s: %s\n",
iomem, strerror(errno));
return -1;
}
/* Separate segment for backup region */
crash_memory_range[0].start = BACKUP_SRC_START;
crash_memory_range[0].end = BACKUP_SRC_END;
crash_memory_range[0].type = RANGE_RAM;
memory_ranges++;
while (fgets(line, sizeof(line), fp) != 0) {
char *str;
int type, consumed, count;
if (memory_ranges >= CRASH_MAX_MEMORY_RANGES)
break;
count = sscanf(line, "%Lx-%Lx : %n",
&start, &end, &consumed);
if (count != 2)
continue;
str = line + consumed;
/* Only Dumping memory of type System RAM. */
if (memcmp(str, "System RAM\n", 11) == 0) {
type = RANGE_RAM;
} else if (memcmp(str, "Crash kernel\n", 13) == 0) {
/* Reserved memory region. New kernel can
* use this region to boot into. */
crash_reserved_mem.start = start;
crash_reserved_mem.end = end;
crash_reserved_mem.type = RANGE_RAM;
continue;
} else
continue;
if (start == BACKUP_SRC_START && end >= (BACKUP_SRC_END + 1))
start = BACKUP_SRC_END + 1;
crash_memory_range[memory_ranges].start = start;
crash_memory_range[memory_ranges].end = end;
crash_memory_range[memory_ranges].type = type;
memory_ranges++;
/* Segregate linearly mapped region. */
if ((MAXMEM - 1) >= start && (MAXMEM - 1) <= end) {
crash_memory_range[memory_ranges - 1].end = MAXMEM - 1;
/* Add segregated region. */
crash_memory_range[memory_ranges].start = MAXMEM;
crash_memory_range[memory_ranges].end = end;
crash_memory_range[memory_ranges].type = type;
memory_ranges++;
}
}
fclose(fp);
if (exclude_crash_reserve_region(&memory_ranges) < 0)
return -1;
for (i = 0; i < memory_ranges; i++)
if (saved_max_mem < crash_memory_range[i].end)
saved_max_mem = crash_memory_range[i].end + 1;
*range = crash_memory_range;
*ranges = memory_ranges;
return 0;
}
/* Converts unsigned long to ascii string. */
static void ultoa(unsigned long i, char *str)
{
int j = 0, k;
char tmp;
do {
str[j++] = i % 10 + '0';
} while ((i /= 10) > 0);
str[j] = '\0';
/* Reverse the string. */
for (j = 0, k = strlen(str) - 1; j < k; j++, k--) {
tmp = str[k];
str[k] = str[j];
str[j] = tmp;
}
}
/* Reads the appropriate file and retrieves the SYSTEM RAM regions for whom to
* create Elf headers. Keeping it separate from get_memory_ranges() as
* requirements are different in the case of normal kexec and crashdumps.
*
* Normal kexec needs to look at all of available physical memory irrespective
* of the fact how much of it is being used by currently running kernel.
* Crashdumps need to have access to memory regions actually being used by
* running kernel. Expecting a different file/data structure than /proc/iomem
* to look into down the line. May be something like /proc/kernelmem or may
* be zone data structures exported from kernel.
*/
static int get_crash_memory_ranges(struct memory_range **range, int *ranges)
{
const char *iomem = proc_iomem();
int memory_ranges = 0;
char line[MAX_LINE];
FILE *fp;
unsigned long long start, end;
fp = fopen(iomem, "r");
if (!fp) {
fprintf(stderr, "Cannot open %s: %s\n",
iomem, strerror(errno));
return -1;
}
/* First entry is for first 640K region. Different bios report first
* 640K in different manner hence hardcoding it */
crash_memory_range[0].start = 0x00000000;
crash_memory_range[0].end = 0x0009ffff;
crash_memory_range[0].type = RANGE_RAM;
memory_ranges++;
while(fgets(line, sizeof(line), fp) != 0) {
char *str;
int type, consumed, count;
if (memory_ranges >= CRASH_MAX_MEMORY_RANGES)
break;
count = sscanf(line, "%Lx-%Lx : %n",
&start, &end, &consumed);
if (count != 2)
continue;
str = line + consumed;
#if 0
printf("%016Lx-%016Lx : %s",
start, end, str);
#endif
/* Only Dumping memory of type System RAM. */
if (memcmp(str, "System RAM\n", 11) == 0) {
type = RANGE_RAM;
} else if (memcmp(str, "Crash kernel\n", 13) == 0) {
/* Reserved memory region. New kernel can
* use this region to boot into. */
crash_reserved_mem.start = start;
crash_reserved_mem.end = end;
crash_reserved_mem.type = RANGE_RAM;
continue;
} else {
continue;
}
/* First 640K already registered */
if (start >= 0x00000000 && end <= 0x0009ffff)
continue;
crash_memory_range[memory_ranges].start = start;
crash_memory_range[memory_ranges].end = end;
crash_memory_range[memory_ranges].type = type;
memory_ranges++;
/* Segregate linearly mapped region. */
if ((MAXMEM - 1) >= start && (MAXMEM - 1) <= end) {
crash_memory_range[memory_ranges-1].end = MAXMEM -1;
/* Add segregated region. */
crash_memory_range[memory_ranges].start = MAXMEM;
crash_memory_range[memory_ranges].end = end;
crash_memory_range[memory_ranges].type = type;
memory_ranges++;
}
}
fclose(fp);
if (exclude_crash_reserve_region(&memory_ranges) < 0)
return -1;
*range = crash_memory_range;
*ranges = memory_ranges;
#if 0
int i;
printf("CRASH MEMORY RANGES\n");
for(i = 0; i < memory_ranges; i++) {
start = crash_memory_range[i].start;
end = crash_memory_range[i].end;
printf("%016Lx-%016Lx\n", start, end);
}
#endif
return 0;
}