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/*
* Copyright (C) 2006 Samuel Thibault <samuel.thibault@ens-lyon.org>
*
* This program is free software ; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation ; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY ; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the program ; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sys/types.h>
#include <device/tty.h>
#include <device/cons.h>
#include <machine/pmap.h>
#include <machine/machspl.h>
#include <xen/public/io/console.h>
#include "console.h"
#include "ring.h"
#include "evt.h"
/* Hypervisor part */
decl_simple_lock_data(static, outlock);
decl_simple_lock_data(static, inlock);
static struct xencons_interface *console;
static int kd_pollc;
int kb_mode; /* XXX: actually don't care. */
#undef hyp_console_write
void hyp_console_write(const char *str, int len)
{
hyp_console_io (CONSOLEIO_write, len, kvtolin(str));
}
int hypputc(int c)
{
if (!console) {
char d = c;
hyp_console_io(CONSOLEIO_write, 1, kvtolin(&d));
} else {
spl_t spl = splhigh();
simple_lock(&outlock);
while (hyp_ring_smash(console->out, console->out_prod, console->out_cons)) {
hyp_console_put("ring smash\n");
/* TODO: are we allowed to sleep in putc? */
hyp_yield();
}
hyp_ring_cell(console->out, console->out_prod) = c;
wmb();
console->out_prod++;
hyp_event_channel_send(boot_info.console_evtchn);
simple_unlock(&outlock);
splx(spl);
}
return 0;
}
int hypcnputc(dev_t dev, int c)
{
return hypputc(c);
}
/* get char by polling, used by debugger */
int hypcngetc(dev_t dev, int wait)
{
int ret;
if (wait)
while (console->in_prod == console->in_cons)
hyp_yield();
else
if (console->in_prod == console->in_cons)
return -1;
ret = hyp_ring_cell(console->in, console->in_cons);
mb();
console->in_cons++;
hyp_event_channel_send(boot_info.console_evtchn);
return ret;
}
void cnpollc(boolean_t on) {
if (on) {
kd_pollc++;
} else {
--kd_pollc;
}
}
void kd_setleds1(u_char val)
{
/* Can't do this. */
}
/* Mach part */
struct tty hypcn_tty;
static void hypcnintr(int unit, spl_t spl, void *ret_addr, void *regs) {
struct tty *tp = &hypcn_tty;
if (kd_pollc)
return;
simple_lock(&inlock);
while (console->in_prod != console->in_cons) {
int c = hyp_ring_cell(console->in, console->in_cons);
mb();
console->in_cons++;
#ifdef MACH_KDB
if (c == (char)'£')
panic("£ pressed");
#endif /* MACH_KDB */
if ((tp->t_state & (TS_ISOPEN|TS_WOPEN)))
(*linesw[tp->t_line].l_rint)(c, tp);
}
hyp_event_channel_send(boot_info.console_evtchn);
simple_unlock(&inlock);
}
int hypcnread(int dev, io_req_t ior)
{
struct tty *tp = &hypcn_tty;
tp->t_state |= TS_CARR_ON;
return char_read(tp, ior);
}
int hypcnwrite(int dev, io_req_t ior)
{
return char_write(&hypcn_tty, ior);
}
void hypcnstart(struct tty *tp)
{
spl_t o_pri;
int ch;
unsigned char c;
if (tp->t_state & TS_TTSTOP)
return;
while (1) {
tp->t_state &= ~TS_BUSY;
if (tp->t_state & TS_TTSTOP)
break;
if ((tp->t_outq.c_cc <= 0) || (ch = getc(&tp->t_outq)) == -1)
break;
c = ch;
o_pri = splsoftclock();
hypputc(c);
splx(o_pri);
}
if (tp->t_outq.c_cc <= TTLOWAT(tp)) {
tt_write_wakeup(tp);
}
}
void hypcnstop()
{
}
io_return_t hypcngetstat(dev_t dev, int flavor, int *data, unsigned int *count)
{
return tty_get_status(&hypcn_tty, flavor, data, count);
}
io_return_t hypcnsetstat(dev_t dev, int flavor, int *data, unsigned int count)
{
return tty_set_status(&hypcn_tty, flavor, data, count);
}
int hypcnportdeath(dev_t dev, mach_port_t port)
{
return tty_portdeath(&hypcn_tty, (ipc_port_t) port);
}
int hypcnopen(dev_t dev, int flag, io_req_t ior)
{
struct tty *tp = &hypcn_tty;
spl_t o_pri;
o_pri = spltty();
simple_lock(&tp->t_lock);
if (!(tp->t_state & (TS_ISOPEN|TS_WOPEN))) {
/* XXX ttychars allocates memory */
simple_unlock(&tp->t_lock);
ttychars(tp);
simple_lock(&tp->t_lock);
tp->t_oproc = hypcnstart;
tp->t_stop = hypcnstop;
tp->t_ospeed = tp->t_ispeed = B9600;
tp->t_flags = ODDP|EVENP|ECHO|CRMOD|XTABS;
}
tp->t_state |= TS_CARR_ON;
simple_unlock(&tp->t_lock);
splx(o_pri);
return (char_open(dev, tp, flag, ior));
}
int hypcnclose(int dev, int flag)
{
struct tty *tp = &hypcn_tty;
spl_t s = spltty();
simple_lock(&tp->t_lock);
ttyclose(tp);
simple_unlock(&tp->t_lock);
splx(s);
return 0;
}
int hypcnprobe(struct consdev *cp)
{
struct xencons_interface *my_console;
my_console = (void*) mfn_to_kv(boot_info.console_mfn);
cp->cn_dev = makedev(0, 0);
cp->cn_pri = CN_INTERNAL;
return 0;
}
int hypcninit(struct consdev *cp)
{
if (console)
return 0;
simple_lock_init(&outlock);
simple_lock_init(&inlock);
console = (void*) mfn_to_kv(boot_info.console_mfn);
pmap_set_page_readwrite(console);
hyp_evt_handler(boot_info.console_evtchn, hypcnintr, 0, SPL6);
return 0;
}
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