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#include <xc.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <caml/alloc.h>
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/mlvalues.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
int xen_evtchn_bind (int evtchn_fd, int idx);
int xen_evtchn_unbind (int evtchn_fd, int idx);
int
__evtchn_open (char *filename, int major, int minor)
{
int evtchn_fd;
struct stat st;
/* Make sure any existing device file links to correct device. */
if ( (lstat(filename, &st) != 0) ||
!S_ISCHR(st.st_mode) ||
(st.st_rdev != makedev(major, minor)) )
{
(void)unlink(filename);
}
reopen:
evtchn_fd = open(filename, O_RDWR);
if ( evtchn_fd == -1 )
{
if ( (errno == ENOENT) &&
((mkdir("/dev/xen", 0755) == 0) || (errno == EEXIST)) &&
(mknod(filename, S_IFCHR|0600, makedev(major,minor)) == 0) )
{
goto reopen;
}
return -errno;
}
return evtchn_fd;
}
/*
* evtchn_open : string -> int -> int -> Unix.file_descr
*
* OCaml's Unix library doesn't have mknod, so it makes more sense just write
* this in C. This code is from Keir/Andy.
*/
value
evtchn_open (value filename, value major, value minor)
{
CAMLparam3(filename, major, minor);
char *myfilename = String_val(filename);
int mymajor = Int_val(major);
int myminor = Int_val(minor);
int evtchn_fd;
evtchn_fd = __evtchn_open(myfilename, mymajor, myminor);
CAMLreturn(Val_int(evtchn_fd));
}
/*
* evtchn_bind : Unix.file_descr -> int -> unit
*/
value
evtchn_bind (value fd, value idx)
{
CAMLparam2(fd, idx);
int myfd = Int_val(fd);
int myidx = Int_val(idx);
if ( xen_evtchn_bind(myfd, myidx) < 0 )
{
printf("(pdb) evtchn_bind error!\n"); fflush(stdout);
failwith("evtchn_bind error");
}
CAMLreturn(Val_unit);
}
/*
* evtchn_unbind : Unix.file_descr -> int -> unit
*/
value
evtchn_unbind (value fd, value idx)
{
CAMLparam2(fd, idx);
int myfd = Int_val(fd);
int myidx = Int_val(idx);
if ( xen_evtchn_unbind(myfd, myidx) < 0 )
{
printf("(pdb) evtchn_unbind error!\n"); fflush(stdout);
failwith("evtchn_unbind error");
}
CAMLreturn(Val_unit);
}
/*
* evtchn_read : Unix.file_descr -> int
*/
value
evtchn_read (value fd)
{
CAMLparam1(fd);
u16 v;
int bytes;
int rc = -1;
int myfd = Int_val(fd);
while ( (bytes = read(myfd, &v, sizeof(v))) == -1 )
{
if ( errno == EINTR ) continue;
rc = -errno;
goto exit;
}
if ( bytes == sizeof(v) )
rc = v;
exit:
CAMLreturn(Val_int(rc));
}
/*
* evtchn_close : Unix.file_descr -> unit
*/
value
evtchn_close (value fd)
{
CAMLparam1(fd);
int myfd = Int_val(fd);
(void)close(myfd);
CAMLreturn(Val_unit);
}
/*
* evtchn_unmask : Unix.file_descr -> int -> unit
*/
value
evtchn_unmask (value fd, value idx)
{
CAMLparam1(fd);
int myfd = Int_val(fd);
u16 myidx = Int_val(idx);
(void)write(myfd, &myidx, sizeof(myidx));
CAMLreturn(Val_unit);
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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