/* * 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 #include #include #include #include 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; }