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/*
* Helper functions for reading the memory map of a device
* following the ST DfuSe 1.1a specification.
*
* Copyright 2011-2014 Tormod Volden <debian.tormod@gmail.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; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "portable.h"
#include "dfu_file.h"
#include "dfuse_mem.h"
int add_segment(struct memsegment **segment_list, struct memsegment segment)
{
struct memsegment *new_element;
new_element = dfu_malloc(sizeof(struct memsegment));
*new_element = segment;
new_element->next = NULL;
if (*segment_list == NULL)
/* list can be empty on first call */
*segment_list = new_element;
else {
struct memsegment *next_element;
/* find last element in list */
next_element = *segment_list;
while (next_element->next != NULL)
next_element = next_element->next;
next_element->next = new_element;
}
return 0;
}
struct memsegment *find_segment(struct memsegment *segment_list,
unsigned int address)
{
while (segment_list != NULL) {
if (segment_list->start <= address &&
segment_list->end >= address)
return segment_list;
segment_list = segment_list->next;
}
return NULL;
}
void free_segment_list(struct memsegment *segment_list)
{
struct memsegment *next_element;
while (segment_list->next != NULL) {
next_element = segment_list->next;
free(segment_list);
segment_list = next_element;
}
free(segment_list);
}
/* Parse memory map from interface descriptor string
* encoded as per ST document UM0424 section 4.3.2.
*/
struct memsegment *parse_memory_layout(char *intf_desc)
{
char multiplier, memtype;
unsigned int address;
int sectors, size;
char *name, *typestring;
int ret;
int count = 0;
char separator;
int scanned;
struct memsegment *segment_list = NULL;
struct memsegment segment;
name = dfu_malloc(strlen(intf_desc));
ret = sscanf(intf_desc, "@%[^/]%n", name, &scanned);
if (ret < 1) {
free(name);
warnx("Could not read name, sscanf returned %d", ret);
return NULL;
}
printf("DfuSe interface name: \"%s\"\n", name);
intf_desc += scanned;
typestring = dfu_malloc(strlen(intf_desc));
while (ret = sscanf(intf_desc, "/0x%x/%n", &address, &scanned),
ret > 0) {
intf_desc += scanned;
while (ret = sscanf(intf_desc, "%d*%d%c%[^,/]%n",
§ors, &size, &multiplier, typestring,
&scanned), ret > 2) {
intf_desc += scanned;
count++;
memtype = 0;
if (ret == 4) {
if (strlen(typestring) == 1
&& typestring[0] != '/')
memtype = typestring[0];
else {
warnx("Parsing type identifier '%s' "
"failed for segment %i",
typestring, count);
continue;
}
}
/* Quirk for STM32F4 devices */
if (strcmp(name, "Device Feature") == 0)
memtype = 'e';
switch (multiplier) {
case 'B':
break;
case 'K':
size *= 1024;
break;
case 'M':
size *= 1024 * 1024;
break;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
if (!memtype) {
warnx("Non-valid multiplier '%c', "
"interpreted as type "
"identifier instead",
multiplier);
memtype = multiplier;
break;
}
/* if memtype was already set: */
/* fall-through */
default:
warnx("Non-valid multiplier '%c', "
"assuming bytes", multiplier);
}
if (!memtype) {
warnx("No valid type for segment %d\n", count);
continue;
}
segment.start = address;
segment.end = address + sectors * size - 1;
segment.pagesize = size;
segment.memtype = memtype & 7;
add_segment(&segment_list, segment);
if (verbose)
printf("Memory segment at 0x%08x %3d x %4d = "
"%5d (%s%s%s)\n",
address, sectors, size, sectors * size,
memtype & DFUSE_READABLE ? "r" : "",
memtype & DFUSE_ERASABLE ? "e" : "",
memtype & DFUSE_WRITEABLE ? "w" : "");
address += sectors * size;
separator = *intf_desc;
if (separator == ',')
intf_desc += 1;
else
break;
} /* while per segment */
} /* while per address */
free(name);
free(typestring);
return segment_list;
}
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