78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
|
/*
|
||
|
|
* peek utility - for those who remember the good old days!
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* Copyright (C) 2013 - 2016 Xilinx, Inc. All rights reserved.
|
||
|
|
*
|
||
|
|
* Permission is hereby granted, free of charge, to any person
|
||
|
|
* obtaining a copy of this software and associated documentation
|
||
|
|
* files (the "Software"), to deal in the Software without restriction,
|
||
|
|
* including without limitation the rights to use, copy, modify, merge,
|
||
|
|
* publish, distribute, sublicense, and/or sell copies of the Software,
|
||
|
|
* and to permit persons to whom the Software is furnished to do so,
|
||
|
|
* subject to the following conditions:
|
||
|
|
*
|
||
|
|
* The above copyright notice and this permission notice shall be included
|
||
|
|
* in all copies or substantial portions of the Software.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
||
|
|
* IN NO EVENT SHALL XILINX BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||
|
|
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||
|
|
*
|
||
|
|
* Except as contained in this notice, the name of the Xilinx shall not be used
|
||
|
|
* in advertising or otherwise to promote the sale, use or other dealings in this
|
||
|
|
* Software without prior written authorization from Xilinx.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <sys/mman.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
|
||
|
|
void usage(char *prog)
|
||
|
|
{
|
||
|
|
printf("usage: %s ADDR\n",prog);
|
||
|
|
printf("\n");
|
||
|
|
printf("ADDR may be specified as hex values\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
int fd;
|
||
|
|
void *ptr;
|
||
|
|
unsigned addr, page_addr, page_offset;
|
||
|
|
unsigned page_size=sysconf(_SC_PAGESIZE);
|
||
|
|
|
||
|
|
if(argc!=2) {
|
||
|
|
usage(argv[0]);
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
fd=open("/dev/mem",O_RDONLY);
|
||
|
|
if(fd<1) {
|
||
|
|
perror(argv[0]);
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
addr=strtoul(argv[1],NULL,0);
|
||
|
|
page_addr=(addr & ~(page_size-1));
|
||
|
|
page_offset=addr-page_addr;
|
||
|
|
|
||
|
|
ptr=mmap(NULL,page_size,PROT_READ,MAP_SHARED,fd,(addr & ~(page_size-1)));
|
||
|
|
if((int)ptr==-1) {
|
||
|
|
perror(argv[0]);
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
printf("0x%08x\n",*((unsigned *)(ptr+page_offset)));
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|