1 files changed, 76 insertions, 0 deletions

diff --git a/meta-xilinx-demos/recipes-examples/peekpoke/files/peek.c b/meta-xilinx-demos/recipes-examples/peekpoke/files/peek.c
new file mode 100644
index 00000000..53bd1d1c
--- /dev/null
+++ b/meta-xilinx-demos/recipes-examples/peekpoke/files/peek.c
@@ -0,0 +1,76 @@
+/*
+* 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>
+#include <stdint.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;
+        uint64_t addr, page_addr, page_offset;
+        uint64_t 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((int64_t)ptr==-1) {
+                perror(argv[0]);
+                exit(-1);
+        }
+
+        printf("0x%08lx\n",*((uint64_t *)(ptr+page_offset)));
+        return 0;
+}