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Software for White Rabbit PTP Core
Commit a4c82fb6 authored by Alessandro Rubini's avatar Alessandro Rubini Committed by Grzegorz Daniluk
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tools: added mapper 

Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
parent 4498a41f
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Showing with 69 additions and 1 deletion
tools/Makefile
View file @ a4c82fb6
......@@ -6,7 +6,7 @@ LDFLAGS = -lutil
ALL = genraminit genramvhd genrammif wrpc-uart-sw
ALL += wrpc-w1-read wrpc-w1-write
ALL += pfilter-builder
ALL += wrpc-dump
ALL += wrpc-dump mapper
ifneq ($(EB),no)
ALL += eb-w1-write
......
tools/mapper.c 0 → 100644
View file @ a4c82fb6
/*
* mapper.c -- simple file that mmap()s a file region and prints it
* Alessandro Rubini 1997-2008
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <errno.h>
int main(int argc, char **argv)
{
char *fname;
FILE *f;
int pagesize = getpagesize();
unsigned int pos, pos_pg, pos_off;
unsigned int len, len_pg, len_off;
void *address;
char *rest;
if (argc !=4
|| sscanf(argv[2],"%i", &pos) != 1
|| sscanf(argv[3],"%i", &len) != 1) {
fprintf(stderr, "%s: Usage \"%s <file> <offset> <len>\"\n",
argv[0], argv[0]);
exit(1);
}
/* note: pos may be more than 2G, so use strtoul */
pos = strtoul(argv[2], &rest, 0);
if (rest && *rest) {
fprintf(stderr, "%s: Usage \"%s <file> <offset> <len>\"\n",
argv[0], argv[0]);
exit(1);
}
fname=argv[1];
if (!(f=fopen(fname,"r"))) {
fprintf(stderr, "%s: %s: %s\n", argv[0], fname,
strerror(errno));
exit(1);
}
/* page-align our numbers, as we depend on the MMU */
pos_pg = pos & ~(pagesize-1);
pos_off = pos & (pagesize-1);
len_pg = (len + pos_off + pagesize-1) & ~(pagesize-1);
len_off = (len + pos_off) & (pagesize-1);
(void)len_off; /* no, I don't use it. Prevent a warning */
address=mmap(0, len_pg,
PROT_READ, MAP_FILE | MAP_PRIVATE, fileno(f), pos_pg);
if (address == (void *)-1) {
fprintf(stderr,"%s: mmap(): %s\n",argv[0],strerror(errno));
exit(1);
}
fclose(f);
fprintf(stderr, "mapped \"%s\" from %i to %i (0x%x to 0x%x) \n",
fname, pos, pos+len, pos_pg, pos_pg+len_pg);
if (fwrite(address+pos_off, 1, len, stdout) != len) {
fprintf(stderr, "%s: write(): %s\n", argv[0], strerror(errno));
exit(1);
}
return 0;
}
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