78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
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* poke utility - for those who remember the good old days!
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*
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* Copyright (C) 2013 - 2016 Xilinx, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL XILINX BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of the Xilinx shall not be used
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* in advertising or otherwise to promote the sale, use or other dealings in this
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* Software without prior written authorization from Xilinx.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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void usage(char *prog)
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{
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printf("usage: %s ADDR VAL\n",prog);
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printf("\n");
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printf("ADDR and VAL may be specified as hex values\n");
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}
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int main(int argc, char *argv[])
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{
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int fd;
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void *ptr;
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unsigned val;
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unsigned addr, page_addr, page_offset;
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unsigned page_size=sysconf(_SC_PAGESIZE);
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fd=open("/dev/mem",O_RDWR);
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if(fd<1) {
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perror(argv[0]);
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exit(-1);
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}
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if(argc!=3) {
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usage(argv[0]);
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exit(-1);
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}
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addr=strtoul(argv[1],NULL,0);
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val=strtoul(argv[2],NULL,0);
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page_addr=(addr & ~(page_size-1));
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page_offset=addr-page_addr;
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ptr=mmap(NULL,page_size,PROT_READ|PROT_WRITE,MAP_SHARED,fd,(addr & ~(page_size-1)));
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if((int)ptr==-1) {
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perror(argv[0]);
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exit(-1);
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}
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*((unsigned *)(ptr+page_offset))=val;
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return 0;
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}
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