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0f210c922b
freebsd/sys/dev/ppbus/if_plip.c
Nicolas Souchu 0f210c922b Port of ppbus standalone framework to the newbus system. 
Note1: the correct interrupt level is invoked correctly for each driver.
       For this purpose, drivers request the bus before being able to
       call BUS_SETUP_INTR and BUS_TEARDOWN_INTR call is forced by the ppbus
       core when drivers release it. Thus, when BUS_SETUP_INTR is called
       at ppbus driver level, ppbus checks that the caller owns the
       bus and stores the interrupt handler cookie (in order to unregister
       it later).

       Printing is impossible while plip link is up is still TRUE.
       vpo (ZIP driver) and lpt are make in such a way that
       using the ZIP and printing concurrently is permitted is also TRUE.

Note2: specific chipset detection is not done by default. PPC_PROBE_CHIPSET
       is now needed to force chipset detection. If set, the flags 0x40
       still avoid detection at boot.

Port of the pcf(4) driver to the newbus system (was previously directly
connected to the rootbus and attached by a bogus pcf_isa_probe function).
2000-01-14 00:18:06 +00:00

791 lines
18 KiB
C
Raw Blame History

/*-
* Copyright (c) 1997 Poul-Henning Kamp
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp
* $FreeBSD$
*/
/*
* Parallel port TCP/IP interfaces added. I looked at the driver from
* MACH but this is a complete rewrite, and btw. incompatible, and it
* should perform better too. I have never run the MACH driver though.
*
* This driver sends two bytes (0x08, 0x00) in front of each packet,
* to allow us to distinguish another format later.
*
* Now added an Linux/Crynwr compatibility mode which is enabled using
* IF_LINK0 - Tim Wilkinson.
*
* TODO:
* Make HDLC/PPP mode, use IF_LLC1 to enable.
*
* Connect the two computers using a Laplink parallel cable to use this
* feature:
*
* +----------------------------------------+
* |A-name A-End B-End Descr. Port/Bit |
* +----------------------------------------+
* |DATA0 2 15 Data 0/0x01 |
* |-ERROR 15 2 1/0x08 |
* +----------------------------------------+
* |DATA1 3 13 Data 0/0x02 |
* |+SLCT 13 3 1/0x10 |
* +----------------------------------------+
* |DATA2 4 12 Data 0/0x04 |
* |+PE 12 4 1/0x20 |
* +----------------------------------------+
* |DATA3 5 10 Strobe 0/0x08 |
* |-ACK 10 5 1/0x40 |
* +----------------------------------------+
* |DATA4 6 11 Data 0/0x10 |
* |BUSY 11 6 1/~0x80 |
* +----------------------------------------+
* |GND 18-25 18-25 GND - |
* +----------------------------------------+
*
* Expect transfer-rates up to 75 kbyte/sec.
*
* If GCC could correctly grok
* register int port asm("edx")
* the code would be cleaner
*
* Poul-Henning Kamp <phk@freebsd.org>
*/
/*
* Update for ppbus, PLIP support only - Nicolas Souchu
*/
#include "plip.h"
#if NPLIP > 0
#include "opt_plip.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <machine/clock.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <net/bpf.h>
#include <dev/ppbus/ppbconf.h>
#include "ppbus_if.h"
#include <dev/ppbus/ppbio.h>
#ifndef LPMTU /* MTU for the lp# interfaces */
#define LPMTU 1500
#endif
#ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */
#define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */
#endif
#ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */
#define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */
#endif
#ifndef LPMAXERRS /* Max errors before !RUNNING */
#define LPMAXERRS 100
#endif
#define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */
#define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */
#define MLPIPHDRLEN CLPIPHDRLEN
#define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */
#define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */
#if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN
#define MLPIPHDRLEN LPIPHDRLEN
#endif
#define LPIPTBLSIZE 256 /* Size of octet translation table */
#define lprintf if (lptflag) printf
#ifdef PLIP_DEBUG
static int volatile lptflag = 1;
#else
static int volatile lptflag = 0;
#endif
struct lp_data {
unsigned short lp_unit;
struct ifnet sc_if;
u_char *sc_ifbuf;
int sc_iferrs;
struct resource *res_irq;
};
/* Tables for the lp# interface */
static u_char *txmith;
#define txmitl (txmith+(1*LPIPTBLSIZE))
#define trecvh (txmith+(2*LPIPTBLSIZE))
#define trecvl (txmith+(3*LPIPTBLSIZE))
static u_char *ctxmith;
#define ctxmitl (ctxmith+(1*LPIPTBLSIZE))
#define ctrecvh (ctxmith+(2*LPIPTBLSIZE))
#define ctrecvl (ctxmith+(3*LPIPTBLSIZE))
/* Functions for the lp# interface */
static int lp_probe(device_t dev);
static int lp_attach(device_t dev);
static int lpinittables(void);
static int lpioctl(struct ifnet *, u_long, caddr_t);
static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
static void lp_intr(void *);
#define DEVTOSOFTC(dev) \
((struct lp_data *)device_get_softc(dev))
#define UNITOSOFTC(unit) \
((struct lp_data *)devclass_get_softc(lp_devclass, (unit)))
#define UNITODEVICE(unit) \
(devclass_get_device(lp_devclass, (unit)))
static devclass_t lp_devclass;
static device_method_t lp_methods[] = {
/* device interface */
DEVMETHOD(device_probe, lp_probe),
DEVMETHOD(device_attach, lp_attach),
{ 0, 0 }
};
static driver_t lp_driver = {
"plip",
lp_methods,
sizeof(struct lp_data),
};
/*
* lpprobe()
*/
static int
lp_probe(device_t dev)
{
device_t ppbus = device_get_parent(dev);
struct lp_data *lp;
int irq, zero = 0;
lp = DEVTOSOFTC(dev);
bzero(lp, sizeof(struct lp_data));
/* retrieve the ppbus irq */
BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
/* if we haven't interrupts, the probe fails */
if (irq == -1) {
device_printf(dev, "not an interrupt driven port, failed.\n");
return (ENXIO);
}
/* reserve the interrupt resource, expecting irq is available to continue */
lp->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, irq, irq, 1,
RF_SHAREABLE);
if (lp->res_irq == 0) {
device_printf(dev, "cannot reserve interrupt, failed.\n");
return (ENXIO);
}
/*
* lp dependent initialisation.
*/
lp->lp_unit = device_get_unit(dev);
device_set_desc(dev, "PLIP network interface");
return (0);
}
static int
lp_attach (device_t dev)
{
struct lp_data *lp = DEVTOSOFTC(dev);
struct ifnet *ifp = &lp->sc_if;
ifp->if_softc = lp;
ifp->if_name = "lp";
ifp->if_unit = device_get_unit(dev);
ifp->if_mtu = LPMTU;
ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
ifp->if_ioctl = lpioctl;
ifp->if_output = lpoutput;
ifp->if_type = IFT_PARA;
ifp->if_hdrlen = 0;
ifp->if_addrlen = 0;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
if_attach(ifp);
bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
return (0);
}
/*
* Build the translation tables for the LPIP (BSD unix) protocol.
* We don't want to calculate these nasties in our tight loop, so we
* precalculate them when we initialize.
*/
static int
lpinittables (void)
{
int i;
if (!txmith)
txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
if (!txmith)
return 1;
if (!ctxmith)
ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
if (!ctxmith)
return 1;
for (i=0; i < LPIPTBLSIZE; i++) {
ctxmith[i] = (i & 0xF0) >> 4;
ctxmitl[i] = 0x10 | (i & 0x0F);
ctrecvh[i] = (i & 0x78) << 1;
ctrecvl[i] = (i & 0x78) >> 3;
}
for (i=0; i < LPIPTBLSIZE; i++) {
txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
}
return 0;
}
/*
* Process an ioctl request.
*/
static int
lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
{
device_t dev = UNITODEVICE(ifp->if_unit);
device_t ppbus = device_get_parent(dev);
struct lp_data *sc = DEVTOSOFTC(dev);
struct ifaddr *ifa = (struct ifaddr *)data;
struct ifreq *ifr = (struct ifreq *)data;
u_char *ptr;
void *ih;
int error;
switch (cmd) {
case SIOCSIFDSTADDR:
case SIOCAIFADDR:
case SIOCSIFADDR:
if (ifa->ifa_addr->sa_family != AF_INET)
return EAFNOSUPPORT;
ifp->if_flags |= IFF_UP;
/* FALLTHROUGH */
case SIOCSIFFLAGS:
if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
ppb_wctr(ppbus, 0x00);
ifp->if_flags &= ~IFF_RUNNING;
/* IFF_UP is not set, try to release the bus anyway */
ppb_release_bus(ppbus, dev);
break;
}
if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
/* XXX
* Should the request be interruptible?
*/
if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR)))
return (error);
/* Now IFF_UP means that we own the bus */
ppb_set_mode(ppbus, PPB_COMPATIBLE);
if (lpinittables()) {
ppb_release_bus(ppbus, dev);
return ENOBUFS;
}
sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN,
M_DEVBUF, M_WAITOK);
if (!sc->sc_ifbuf) {
ppb_release_bus(ppbus, dev);
return ENOBUFS;
}
/* attach our interrupt handler, later detached when the bus is released */
if ((error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq,
INTR_TYPE_NET, lp_intr, dev, &ih))) {
ppb_release_bus(ppbus, dev);
return (error);
}
ppb_wctr(ppbus, IRQENABLE);
ifp->if_flags |= IFF_RUNNING;
}
break;
case SIOCSIFMTU:
ptr = sc->sc_ifbuf;
sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT);
if (!sc->sc_ifbuf) {
sc->sc_ifbuf = ptr;
return ENOBUFS;
}
if (ptr)
free(ptr,M_DEVBUF);
sc->sc_if.if_mtu = ifr->ifr_mtu;
break;
case SIOCGIFMTU:
ifr->ifr_mtu = sc->sc_if.if_mtu;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
if (ifr == 0) {
return EAFNOSUPPORT; /* XXX */
}
switch (ifr->ifr_addr.sa_family) {
case AF_INET:
break;
default:
return EAFNOSUPPORT;
}
break;
case SIOCGIFMEDIA:
/*
* No ifmedia support at this stage; maybe use it
* in future for eg. protocol selection.
*/
return EINVAL;
default:
lprintf("LP:ioctl(0x%lx)\n", cmd);
return EINVAL;
}
return 0;
}
static __inline int
clpoutbyte (u_char byte, int spin, device_t ppbus)
{
ppb_wdtr(ppbus, ctxmitl[byte]);
while (ppb_rstr(ppbus) & CLPIP_SHAKE)
if (--spin == 0) {
return 1;
}
ppb_wdtr(ppbus, ctxmith[byte]);
while (!(ppb_rstr(ppbus) & CLPIP_SHAKE))
if (--spin == 0) {
return 1;
}
return 0;
}
static __inline int
clpinbyte (int spin, device_t ppbus)
{
u_char c, cl;
while((ppb_rstr(ppbus) & CLPIP_SHAKE))
if(!--spin) {
return -1;
}
cl = ppb_rstr(ppbus);
ppb_wdtr(ppbus, 0x10);
while(!(ppb_rstr(ppbus) & CLPIP_SHAKE))
if(!--spin) {
return -1;
}
c = ppb_rstr(ppbus);
ppb_wdtr(ppbus, 0x00);
return (ctrecvl[cl] | ctrecvh[c]);
}
static void
lptap(struct ifnet *ifp, struct mbuf *m)
{
/*
* Send a packet through bpf. We need to prepend the address family
* as a four byte field. Cons up a dummy header to pacify bpf. This
* is safe because bpf will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer to it).
*/
u_int32_t af = AF_INET;
struct mbuf m0;
m0.m_next = m;
m0.m_len = sizeof(u_int32_t);
m0.m_data = (char *)&af;
bpf_mtap(ifp, &m0);
}
static void
lp_intr (void *arg)
{
device_t dev = (device_t)arg;
device_t ppbus = device_get_parent(dev);
struct lp_data *sc = DEVTOSOFTC(dev);
int len, s, j;
u_char *bp;
u_char c, cl;
struct mbuf *top;
s = splhigh();
if (sc->sc_if.if_flags & IFF_LINK0) {
/* Ack. the request */
ppb_wdtr(ppbus, 0x01);
/* Get the packet length */
j = clpinbyte(LPMAXSPIN2, ppbus);
if (j == -1)
goto err;
len = j;
j = clpinbyte(LPMAXSPIN2, ppbus);
if (j == -1)
goto err;
len = len + (j << 8);
if (len > sc->sc_if.if_mtu + MLPIPHDRLEN)
goto err;
bp = sc->sc_ifbuf;
while (len--) {
j = clpinbyte(LPMAXSPIN2, ppbus);
if (j == -1) {
goto err;
}
*bp++ = j;
}
/* Get and ignore checksum */
j = clpinbyte(LPMAXSPIN2, ppbus);
if (j == -1) {
goto err;
}
len = bp - sc->sc_ifbuf;
if (len <= CLPIPHDRLEN)
goto err;
sc->sc_iferrs = 0;
if (IF_QFULL(&ipintrq)) {
lprintf("DROP");
IF_DROP(&ipintrq);
goto done;
}
len -= CLPIPHDRLEN;
sc->sc_if.if_ipackets++;
sc->sc_if.if_ibytes += len;
top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0);
if (top) {
if (sc->sc_if.if_bpf)
lptap(&sc->sc_if, top);
IF_ENQUEUE(&ipintrq, top);
schednetisr(NETISR_IP);
}
goto done;
}
while ((ppb_rstr(ppbus) & LPIP_SHAKE)) {
len = sc->sc_if.if_mtu + LPIPHDRLEN;
bp = sc->sc_ifbuf;
while (len--) {
cl = ppb_rstr(ppbus);
ppb_wdtr(ppbus, 8);
j = LPMAXSPIN2;
while((ppb_rstr(ppbus) & LPIP_SHAKE))
if(!--j) goto err;
c = ppb_rstr(ppbus);
ppb_wdtr(ppbus, 0);
*bp++= trecvh[cl] | trecvl[c];
j = LPMAXSPIN2;
while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) {
if (cl != c &&
(((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) ==
(c & 0xf8))
goto end;
if (!--j) goto err;
}
}
end:
len = bp - sc->sc_ifbuf;
if (len <= LPIPHDRLEN)
goto err;
sc->sc_iferrs = 0;
if (IF_QFULL(&ipintrq)) {
lprintf("DROP");
IF_DROP(&ipintrq);
goto done;
}
len -= LPIPHDRLEN;
sc->sc_if.if_ipackets++;
sc->sc_if.if_ibytes += len;
top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0);
if (top) {
if (sc->sc_if.if_bpf)
lptap(&sc->sc_if, top);
IF_ENQUEUE(&ipintrq, top);
schednetisr(NETISR_IP);
}
}
goto done;
err:
ppb_wdtr(ppbus, 0);
lprintf("R");
sc->sc_if.if_ierrors++;
sc->sc_iferrs++;
/*
* We are not able to send receive anything for now,
* so stop wasting our time
*/
if (sc->sc_iferrs > LPMAXERRS) {
printf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev));
ppb_wctr(ppbus, 0x00);
sc->sc_if.if_flags &= ~IFF_RUNNING;
sc->sc_iferrs=0;
}
done:
splx(s);
return;
}
static __inline int
lpoutbyte (u_char byte, int spin, device_t ppbus)
{
ppb_wdtr(ppbus, txmith[byte]);
while (!(ppb_rstr(ppbus) & LPIP_SHAKE))
if (--spin == 0)
return 1;
ppb_wdtr(ppbus, txmitl[byte]);
while (ppb_rstr(ppbus) & LPIP_SHAKE)
if (--spin == 0)
return 1;
return 0;
}
static int
lpoutput (struct ifnet *ifp, struct mbuf *m,
struct sockaddr *dst, struct rtentry *rt)
{
device_t dev = UNITODEVICE(ifp->if_unit);
device_t ppbus = device_get_parent(dev);
int s, err;
struct mbuf *mm;
u_char *cp = "\0\0";
u_char chksum = 0;
int count = 0;
int i, len, spin;
/* We need a sensible value if we abort */
cp++;
ifp->if_flags |= IFF_RUNNING;
err = 1; /* assume we're aborting because of an error */
s = splhigh();
/* Suspend (on laptops) or receive-errors might have taken us offline */
ppb_wctr(ppbus, IRQENABLE);
if (ifp->if_flags & IFF_LINK0) {
if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
lprintf("&");
lp_intr(dev);
}
/* Alert other end to pending packet */
spin = LPMAXSPIN1;
ppb_wdtr(ppbus, 0x08);
while ((ppb_rstr(ppbus) & 0x08) == 0)
if (--spin == 0) {
goto nend;
}
/* Calculate length of packet, then send that */
count += 14; /* Ethernet header len */
mm = m;
for (mm = m; mm; mm = mm->m_next) {
count += mm->m_len;
}
if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus))
goto nend;
if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus))
goto nend;
/* Send dummy ethernet header */
for (i = 0; i < 12; i++) {
if (clpoutbyte(i, LPMAXSPIN1, ppbus))
goto nend;
chksum += i;
}
if (clpoutbyte(0x08, LPMAXSPIN1, ppbus))
goto nend;
if (clpoutbyte(0x00, LPMAXSPIN1, ppbus))
goto nend;
chksum += 0x08 + 0x00; /* Add into checksum */
mm = m;
do {
cp = mtod(mm, u_char *);
len = mm->m_len;
while (len--) {
chksum += *cp;
if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus))
goto nend;
}
} while ((mm = mm->m_next));
/* Send checksum */
if (clpoutbyte(chksum, LPMAXSPIN2, ppbus))
goto nend;
/* Go quiescent */
ppb_wdtr(ppbus, 0);
err = 0; /* No errors */
nend:
if (err) { /* if we didn't timeout... */
ifp->if_oerrors++;
lprintf("X");
} else {
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
if (ifp->if_bpf)
lptap(ifp, m);
}
m_freem(m);
if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) {
lprintf("^");
lp_intr(dev);
}
(void) splx(s);
return 0;
}
if (ppb_rstr(ppbus) & LPIP_SHAKE) {
lprintf("&");
lp_intr(dev);
}
if (lpoutbyte(0x08, LPMAXSPIN1, ppbus))
goto end;
if (lpoutbyte(0x00, LPMAXSPIN2, ppbus))
goto end;
mm = m;
do {
cp = mtod(mm,u_char *);
len = mm->m_len;
while (len--)
if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus))
goto end;
} while ((mm = mm->m_next));
err = 0; /* no errors were encountered */
end:
--cp;
ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17);
if (err) { /* if we didn't timeout... */
ifp->if_oerrors++;
lprintf("X");
} else {
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
if (ifp->if_bpf)
lptap(ifp, m);
}
m_freem(m);
if (ppb_rstr(ppbus) & LPIP_SHAKE) {
lprintf("^");
lp_intr(dev);
}
(void) splx(s);
return 0;
}
DRIVER_MODULE(plip, ppbus, lp_driver, lp_devclass, 0, 0);
#endif /* NPLIP > 0 */
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