/*
* Write to a hardware-level file handle.
*/
static
int
emu_write(struct emu_softc *sc, uint32_t handle, uint32_t len,
struct uio *uio)
{
int result;
KASSERT(uio->uio_rw == UIO_WRITE);
if (uio->uio_offset > (off_t)0xffffffff) {
return EFBIG;
}
lock_acquire(sc->e_lock);
emu_wreg(sc, REG_HANDLE, handle);
emu_wreg(sc, REG_IOLEN, len);
emu_wreg(sc, REG_OFFSET, uio->uio_offset);
result = uiomove(sc->e_iobuf, len, uio);
membar_store_store();
if (result) {
goto out;
}
emu_wreg(sc, REG_OPER, EMU_OP_WRITE);
result = emu_waitdone(sc);
out:
lock_release(sc->e_lock);
return result;
}
/*
* Common code for read and readdir.
*/
static
int
emu_doread(struct emu_softc *sc, uint32_t handle, uint32_t len,
uint32_t op, struct uio *uio)
{
int result;
KASSERT(uio->uio_rw == UIO_READ);
if (uio->uio_offset > (off_t)0xffffffff) {
/* beyond the largest size the file can have; generate EOF */
return 0;
}
lock_acquire(sc->e_lock);
emu_wreg(sc, REG_HANDLE, handle);
emu_wreg(sc, REG_IOLEN, len);
emu_wreg(sc, REG_OFFSET, uio->uio_offset);
emu_wreg(sc, REG_OPER, op);
result = emu_waitdone(sc);
if (result) {
goto out;
}
membar_load_load();
result = uiomove(sc->e_iobuf, emu_rreg(sc, REG_IOLEN), uio);
uio->uio_offset = emu_rreg(sc, REG_OFFSET);
out:
lock_release(sc->e_lock);
return result;
}
/*
* Routine for closing a file we opened at the hardware level.
* This is not necessarily called at VOP_LASTCLOSE time; it's called
* at VOP_RECLAIM time.
*/
static
int
emu_close(struct emu_softc *sc, uint32_t handle)
{
int result;
bool mine;
int retries = 0;
mine = lock_do_i_hold(sc->e_lock);
if (!mine) {
lock_acquire(sc->e_lock);
}
while (1) {
/* Retry operation up to 10 times */
emu_wreg(sc, REG_HANDLE, handle);
emu_wreg(sc, REG_OPER, EMU_OP_CLOSE);
result = emu_waitdone(sc);
if (result==EIO && retries < 10) {
kprintf("emu%d: I/O error on close, retrying\n",
sc->e_unit);
retries++;
continue;
}
break;
}
if (!mine) {
lock_release(sc->e_lock);
}
return result;
}
/*
* Common code for read and readdir.
*/
static
int
emu_doread(struct emu_softc *sc, uint32_t handle, uint32_t len,
uint32_t op, struct uio *uio)
{
int result;
KASSERT(uio->uio_rw == UIO_READ);
lock_acquire(sc->e_lock);
emu_wreg(sc, REG_HANDLE, handle);
emu_wreg(sc, REG_IOLEN, len);
emu_wreg(sc, REG_OFFSET, uio->uio_offset);
emu_wreg(sc, REG_OPER, op);
result = emu_waitdone(sc);
if (result) {
goto out;
}
result = uiomove(sc->e_iobuf, emu_rreg(sc, REG_IOLEN), uio);
uio->uio_offset = emu_rreg(sc, REG_OFFSET);
out:
lock_release(sc->e_lock);
return result;
}
/*
* Truncate a hardware-level file handle.
*/
static
int
emu_trunc(struct emu_softc *sc, uint32_t handle, off_t len)
{
int result;
lock_acquire(sc->e_lock);
emu_wreg(sc, REG_HANDLE, handle);
emu_wreg(sc, REG_IOLEN, len);
emu_wreg(sc, REG_OPER, EMU_OP_TRUNC);
result = emu_waitdone(sc);
lock_release(sc->e_lock);
return result;
}
/*
* Get the file size associated with a hardware-level file handle.
*/
static
int
emu_getsize(struct emu_softc *sc, uint32_t handle, off_t *retval)
{
int result;
lock_acquire(sc->e_lock);
emu_wreg(sc, REG_HANDLE, handle);
emu_wreg(sc, REG_OPER, EMU_OP_GETSIZE);
result = emu_waitdone(sc);
if (result==0) {
*retval = emu_rreg(sc, REG_IOLEN);
}
lock_release(sc->e_lock);
return result;
}
/*
* Common file open routine (for both VOP_LOOKUP and VOP_CREATE). Not
* for VOP_EACHOPEN. At the hardware level, we need to "open" files in
* order to look at them, so by the time VOP_EACHOPEN is called the
* files are already open.
*/
static
int
emu_open(struct emu_softc *sc, uint32_t handle, const char *name,
bool create, bool excl, mode_t mode,
uint32_t *newhandle, int *newisdir)
{
uint32_t op;
int result;
if (strlen(name)+1 > EMU_MAXIO) {
return ENAMETOOLONG;
}
if (create && excl) {
op = EMU_OP_EXCLCREATE;
}
else if (create) {
op = EMU_OP_CREATE;
}
else {
op = EMU_OP_OPEN;
}
/* mode isn't supported (yet?) */
(void)mode;
lock_acquire(sc->e_lock);
strcpy(sc->e_iobuf, name);
membar_store_store();
emu_wreg(sc, REG_IOLEN, strlen(name));
emu_wreg(sc, REG_HANDLE, handle);
emu_wreg(sc, REG_OPER, op);
result = emu_waitdone(sc);
if (result==0) {
*newhandle = emu_rreg(sc, REG_HANDLE);
*newisdir = emu_rreg(sc, REG_IOLEN)>0;
}
lock_release(sc->e_lock);
return result;
}