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authorTimothy Pearson <tpearson@raptorengineering.com>2016-09-07 16:40:48 -0500
committerTimothy Pearson <tpearson@raptorengineering.com>2016-09-07 16:40:48 -0500
commit06137ec72f84bdae8095600882e96330e28bc351 (patch)
tree0df21e2a0b057ddc86ec4754fc9b36285afa6e01
parentdd3695fad0ea8b6f46afc59e881ace932202104b (diff)
downloaddevmem-aspeed-06137ec72f84bdae8095600882e96330e28bc351.zip
devmem-aspeed-06137ec72f84bdae8095600882e96330e28bc351.tar.gz
Reformat for easier development
-rw-r--r--devmem-aspeed.c49
1 files changed, 25 insertions, 24 deletions
diff --git a/devmem-aspeed.c b/devmem-aspeed.c
index 7732ecb..4831b12 100644
--- a/devmem-aspeed.c
+++ b/devmem-aspeed.c
@@ -30,7 +30,7 @@
* 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
@@ -48,20 +48,20 @@
#include <termios.h>
#include <sys/types.h>
#include <sys/mman.h>
-
+
#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
__LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)
-
+
#define MAP_SIZE 4096UL
#define MAP_MASK (MAP_SIZE - 1)
int main(int argc, char **argv) {
- int fd;
- void *map_base, *virt_addr;
+ int fd;
+ void *map_base, *virt_addr;
unsigned long read_result, writeval;
off_t target;
int access_type = 'w';
-
+
if(argc < 2) {
fprintf(stderr, "\nUsage:\t%s { address } [ type [ data ] ]\n"
"\taddress : memory address to act upon\n"
@@ -72,22 +72,22 @@ int main(int argc, char **argv) {
}
target = strtoul(argv[1], 0, 0);
- if(argc > 2)
+ if(argc > 2) {
access_type = tolower(argv[2][0]);
+ }
+
+ if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) FATAL;
+ printf("/dev/mem opened.\n");
+ fflush(stdout);
+ /* Map one page */
+ map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, target & ~MAP_MASK);
+ if(map_base == (void *) -1) FATAL;
+ printf("Memory mapped at address %p.\n", map_base);
+ fflush(stdout);
- if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) FATAL;
- printf("/dev/mem opened.\n");
- fflush(stdout);
-
- /* Map one page */
- map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, target & ~MAP_MASK);
- if(map_base == (void *) -1) FATAL;
- printf("Memory mapped at address %p.\n", map_base);
- fflush(stdout);
-
- virt_addr = map_base + (target & MAP_MASK);
- switch(access_type) {
+ virt_addr = map_base + (target & MAP_MASK);
+ switch(access_type) {
case 'b':
read_result = *((unsigned char *) virt_addr);
break;
@@ -101,8 +101,8 @@ int main(int argc, char **argv) {
fprintf(stderr, "Illegal data type '%c'.\n", access_type);
exit(2);
}
- printf("Value at address 0x%X (%p): 0x%X\n", target, virt_addr, read_result);
- fflush(stdout);
+ printf("Value at address 0x%X (%p): 0x%X\n", target, virt_addr, read_result);
+ fflush(stdout);
if(argc > 3) {
writeval = strtoul(argv[3], 0, 0);
@@ -123,9 +123,10 @@ int main(int argc, char **argv) {
printf("Written 0x%X; readback 0x%X\n", writeval, read_result);
fflush(stdout);
}
-
+
if(munmap(map_base, MAP_SIZE) == -1) FATAL;
- close(fd);
- return 0;
+
+ close(fd);
+ return 0;
}
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