a76ef70a14
top.c : Get rid of dis_asm_read_memory_hook. We can now call the disassemblers directly and have no need for this hook anymore. * defs.h, printcmd.c: Make print_insn be static. * ser-go32.c (dos_comisr): Make this 8 bit clean. * (dos_open dos_close): Allow multiple opens to the same device. Use a ref count to prevent unwanted deallocations. * sparcl-tdep.c: Put #ifdefs around all socket stuff to make GO32 happy. * (sparclite_ops): Switch to download_stratum. * target.h (enum strata): Move download_stratum before process_stratum so that executable targets get pushed on top of download targets.
926 lines
20 KiB
C
926 lines
20 KiB
C
/* Remote serial interface for local (hardwired) serial ports for
|
||
GO32. Copyright 1992, 1993 Free Software Foundation, Inc.
|
||
|
||
Contributed by Nigel Stephens, Algorithmics Ltd. (nigel@algor.co.uk).
|
||
|
||
This version uses DPMI interrupts to handle buffered i/o
|
||
without the separate "asynctsr" program.
|
||
|
||
This file is part of GDB.
|
||
|
||
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 this program; if not, write to the Free Software
|
||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "gdbcmd.h"
|
||
#include "serial.h"
|
||
|
||
|
||
/*
|
||
* NS16550 UART registers
|
||
*/
|
||
|
||
#define COM1ADDR 0x3f8
|
||
#define COM2ADDR 0x2f8
|
||
#define COM3ADDR 0x3e8
|
||
#define COM4ADDR 0x3e0
|
||
|
||
#define com_data 0 /* data register (R/W) */
|
||
#define com_dlbl 0 /* divisor latch low (W) */
|
||
#define com_ier 1 /* interrupt enable (W) */
|
||
#define com_dlbh 1 /* divisor latch high (W) */
|
||
#define com_iir 2 /* interrupt identification (R) */
|
||
#define com_fifo 2 /* FIFO control (W) */
|
||
#define com_lctl 3 /* line control register (R/W) */
|
||
#define com_cfcr 3 /* line control register (R/W) */
|
||
#define com_mcr 4 /* modem control register (R/W) */
|
||
#define com_lsr 5 /* line status register (R/W) */
|
||
#define com_msr 6 /* modem status register (R/W) */
|
||
|
||
/*
|
||
* Constants for computing 16 bit baud rate divisor (lower byte
|
||
* in com_dlbl, upper in com_dlbh) from 1.8432MHz crystal. Divisor is
|
||
* 1.8432 MHz / (16 * X) for X bps. If the baud rate can't be set
|
||
* to within +- (desired_rate*SPEED_TOLERANCE/1000) bps, we fail.
|
||
*/
|
||
#define COMTICK (1843200/16)
|
||
#define SPEED_TOLERANCE 30 /* thousandths; real == desired +- 3.0% */
|
||
|
||
/* interrupt enable register */
|
||
#define IER_ERXRDY 0x1 /* int on rx ready */
|
||
#define IER_ETXRDY 0x2 /* int on tx ready */
|
||
#define IER_ERLS 0x4 /* int on line status change */
|
||
#define IER_EMSC 0x8 /* int on modem status change */
|
||
|
||
/* interrupt identification register */
|
||
#define IIR_FIFO_MASK 0xc0 /* set if FIFOs are enabled */
|
||
#define IIR_IMASK 0xf /* interrupt cause mask */
|
||
#define IIR_NOPEND 0x1 /* nothing pending */
|
||
#define IIR_RLS 0x6 /* receive line status */
|
||
#define IIR_RXRDY 0x4 /* receive ready */
|
||
#define IIR_RXTOUT 0xc /* receive timeout */
|
||
#define IIR_TXRDY 0x2 /* transmit ready */
|
||
#define IIR_MLSC 0x0 /* modem status */
|
||
|
||
|
||
/* fifo control register */
|
||
#define FIFO_ENABLE 0x01 /* enable fifo */
|
||
#define FIFO_RCV_RST 0x02 /* reset receive fifo */
|
||
#define FIFO_XMT_RST 0x04 /* reset transmit fifo */
|
||
#define FIFO_DMA_MODE 0x08 /* enable dma mode */
|
||
#define FIFO_TRIGGER_1 0x00 /* trigger at 1 char */
|
||
#define FIFO_TRIGGER_4 0x40 /* trigger at 4 chars */
|
||
#define FIFO_TRIGGER_8 0x80 /* trigger at 8 chars */
|
||
#define FIFO_TRIGGER_14 0xc0 /* trigger at 14 chars */
|
||
|
||
/* character format control register */
|
||
#define CFCR_DLAB 0x80 /* divisor latch */
|
||
#define CFCR_SBREAK 0x40 /* send break */
|
||
#define CFCR_PZERO 0x30 /* zero parity */
|
||
#define CFCR_PONE 0x20 /* one parity */
|
||
#define CFCR_PEVEN 0x10 /* even parity */
|
||
#define CFCR_PODD 0x00 /* odd parity */
|
||
#define CFCR_PENAB 0x08 /* parity enable */
|
||
#define CFCR_STOPB 0x04 /* 2 stop bits */
|
||
#define CFCR_8BITS 0x03 /* 8 data bits */
|
||
#define CFCR_7BITS 0x02 /* 7 data bits */
|
||
#define CFCR_6BITS 0x01 /* 6 data bits */
|
||
#define CFCR_5BITS 0x00 /* 5 data bits */
|
||
|
||
/* modem control register */
|
||
#define MCR_LOOPBACK 0x10 /* loopback */
|
||
#define MCR_IENABLE 0x08 /* output 2 = int enable */
|
||
#define MCR_DRS 0x04 /* output 1 = xxx */
|
||
#define MCR_RTS 0x02 /* enable RTS */
|
||
#define MCR_DTR 0x01 /* enable DTR */
|
||
|
||
/* line status register */
|
||
#define LSR_RCV_FIFO 0x80 /* error in receive fifo */
|
||
#define LSR_TSRE 0x40 /* transmitter empty */
|
||
#define LSR_TXRDY 0x20 /* transmitter ready */
|
||
#define LSR_BI 0x10 /* break detected */
|
||
#define LSR_FE 0x08 /* framing error */
|
||
#define LSR_PE 0x04 /* parity error */
|
||
#define LSR_OE 0x02 /* overrun error */
|
||
#define LSR_RXRDY 0x01 /* receiver ready */
|
||
#define LSR_RCV_MASK 0x1f
|
||
|
||
/* modem status register */
|
||
#define MSR_DCD 0x80
|
||
#define MSR_RI 0x40
|
||
#define MSR_DSR 0x20
|
||
#define MSR_CTS 0x10
|
||
#define MSR_DDCD 0x08
|
||
#define MSR_TERI 0x04
|
||
#define MSR_DDSR 0x02
|
||
#define MSR_DCTS 0x01
|
||
|
||
#include <sys/dos.h>
|
||
#include <sys/go32.h>
|
||
#include <sys/dpmi.h>
|
||
|
||
/* DPMI Communication */
|
||
static union REGS dpmi_regs;
|
||
static struct SREGS dpmi_sregs;
|
||
|
||
/* 16550 rx fifo trigger point */
|
||
#define FIFO_TRIGGER FIFO_TRIGGER_4
|
||
|
||
/* input buffer size */
|
||
#define CBSIZE 4096
|
||
|
||
/* return raw 18Hz clock count */
|
||
extern long rawclock (void);
|
||
|
||
#define RAWHZ 18
|
||
|
||
#ifdef DOS_STATS
|
||
#define CNT_RX 16
|
||
#define CNT_TX 17
|
||
#define CNT_STRAY 18
|
||
#define CNT_ORUN 19
|
||
#define NCNT 20
|
||
|
||
static int intrcnt;
|
||
static int cnts[NCNT];
|
||
static char *cntnames[NCNT] = {
|
||
/* h/w interrupt counts. */
|
||
"mlsc", "nopend", "txrdy", "?3",
|
||
"rxrdy", "?5", "rls", "?7",
|
||
"?8", "?9", "?a", "?b",
|
||
"rxtout", "?d", "?e", "?f",
|
||
/* s/w counts. */
|
||
"rxcnt", "txcnt", "stray", "swoflo"
|
||
};
|
||
|
||
#define COUNT(x) cnts[x]++
|
||
#else
|
||
#define COUNT(x)
|
||
#endif
|
||
|
||
/* Main interrupt controller port addresses. */
|
||
#define ICU_BASE 0x20
|
||
#define ICU_OCW2 (ICU_BASE + 0)
|
||
#define ICU_MASK (ICU_BASE + 1)
|
||
|
||
/* Original interrupt controller mask register. */
|
||
unsigned char icu_oldmask;
|
||
|
||
/* Maximum of 8 interrupts (we don't handle the slave icu yet). */
|
||
#define NINTR 8
|
||
|
||
static struct intrupt
|
||
{
|
||
char inuse;
|
||
struct dos_ttystate *port;
|
||
_go32_dpmi_seginfo old_rmhandler;
|
||
_go32_dpmi_seginfo old_pmhandler;
|
||
_go32_dpmi_seginfo new_rmhandler;
|
||
_go32_dpmi_seginfo new_pmhandler;
|
||
_go32_dpmi_registers regs;
|
||
} intrupts[NINTR];
|
||
|
||
|
||
static struct dos_ttystate
|
||
{
|
||
int base;
|
||
int irq;
|
||
int refcnt;
|
||
struct intrupt *intrupt;
|
||
int fifo;
|
||
int baudrate;
|
||
unsigned char cbuf[CBSIZE];
|
||
unsigned int first;
|
||
unsigned int count;
|
||
int txbusy;
|
||
unsigned char old_mcr;
|
||
int ferr;
|
||
int perr;
|
||
int oflo;
|
||
int msr;
|
||
} ports[4] = {
|
||
{COM1ADDR, 4},
|
||
{COM2ADDR, 3},
|
||
{COM3ADDR, 4},
|
||
{COM4ADDR, 3}
|
||
};
|
||
|
||
static int dos_open PARAMS ((serial_t scb, const char *name));
|
||
static void dos_raw PARAMS ((serial_t scb));
|
||
static int dos_readchar PARAMS ((serial_t scb, int timeout));
|
||
static int dos_setbaudrate PARAMS ((serial_t scb, int rate));
|
||
static int dos_write PARAMS ((serial_t scb, const char *str, int len));
|
||
static void dos_close PARAMS ((serial_t scb));
|
||
static serial_ttystate dos_get_tty_state PARAMS ((serial_t scb));
|
||
static int dos_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
|
||
static int dos_baudconv PARAMS ((int rate));
|
||
|
||
#define inb(p,a) inportb((p)->base + (a))
|
||
#define outb(p,a,v) outportb((p)->base + (a), (v))
|
||
#define disable() asm volatile ("cli");
|
||
#define enable() asm volatile ("sti");
|
||
|
||
|
||
static int
|
||
dos_getc (port)
|
||
volatile struct dos_ttystate *port;
|
||
{
|
||
int c;
|
||
|
||
if (port->count == 0)
|
||
return -1;
|
||
|
||
c = port->cbuf[port->first];
|
||
disable ();
|
||
port->first = (port->first + 1) & (CBSIZE - 1);
|
||
port->count--;
|
||
enable ();
|
||
return c;
|
||
}
|
||
|
||
|
||
static int
|
||
dos_putc (c, port)
|
||
int c;
|
||
struct dos_ttystate *port;
|
||
{
|
||
if (port->count >= CBSIZE - 1)
|
||
return -1;
|
||
port->cbuf[(port->first + port->count) & (CBSIZE - 1)] = c;
|
||
port->count++;
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
static void
|
||
dos_comisr (irq)
|
||
int irq;
|
||
{
|
||
struct dos_ttystate *port;
|
||
unsigned char iir, lsr, c;
|
||
|
||
disable (); /* Paranoia */
|
||
outportb (ICU_OCW2, 0x20); /* End-Of-Interrupt */
|
||
#ifdef DOS_STATS
|
||
++intrcnt;
|
||
#endif
|
||
|
||
port = intrupts[irq].port;
|
||
if (!port)
|
||
{
|
||
COUNT (CNT_STRAY);
|
||
return; /* not open */
|
||
}
|
||
|
||
while (1)
|
||
{
|
||
iir = inb (port, com_iir) & IIR_IMASK;
|
||
switch (iir)
|
||
{
|
||
|
||
case IIR_RLS:
|
||
lsr = inb (port, com_lsr);
|
||
goto rx;
|
||
|
||
case IIR_RXTOUT:
|
||
case IIR_RXRDY:
|
||
lsr = 0;
|
||
|
||
rx:
|
||
do
|
||
{
|
||
c = inb (port, com_data);
|
||
if (lsr & (LSR_BI | LSR_FE | LSR_PE | LSR_OE))
|
||
{
|
||
if (lsr & (LSR_BI | LSR_FE))
|
||
port->ferr++;
|
||
else if (lsr & LSR_PE)
|
||
port->perr++;
|
||
if (lsr & LSR_OE)
|
||
port->oflo++;
|
||
}
|
||
|
||
if (dos_putc (c, port) < 0)
|
||
{
|
||
COUNT (CNT_ORUN);
|
||
}
|
||
else
|
||
{
|
||
COUNT (CNT_RX);
|
||
}
|
||
}
|
||
while ((lsr = inb (port, com_lsr)) & LSR_RXRDY);
|
||
break;
|
||
|
||
case IIR_MLSC:
|
||
/* could be used to flowcontrol Tx */
|
||
port->msr = inb (port, com_msr);
|
||
break;
|
||
|
||
case IIR_TXRDY:
|
||
port->txbusy = 0;
|
||
break;
|
||
|
||
case IIR_NOPEND:
|
||
/* no more pending interrupts, all done */
|
||
return;
|
||
|
||
default:
|
||
/* unexpected interrupt, ignore */
|
||
break;
|
||
}
|
||
COUNT (iir);
|
||
}
|
||
}
|
||
|
||
#ifdef __STDC__
|
||
#define ISRNAME(x) dos_comisr##x
|
||
#else
|
||
#define ISRNAME(x) dos_comisr/**/x
|
||
#endif
|
||
#define ISR(x) static void ISRNAME(x)() {dos_comisr(x);}
|
||
|
||
ISR(0) ISR(1) ISR(2) ISR(3)
|
||
ISR(4) ISR(5) ISR(6) ISR(7)
|
||
|
||
typedef void (*isr_t)();
|
||
|
||
static isr_t isrs[NINTR] = {
|
||
ISRNAME(0), ISRNAME(1), ISRNAME(2), ISRNAME(3),
|
||
ISRNAME(4), ISRNAME(5), ISRNAME(6), ISRNAME(7)
|
||
};
|
||
|
||
|
||
|
||
static struct intrupt *
|
||
dos_hookirq (irq)
|
||
unsigned int irq;
|
||
{
|
||
struct intrupt *intr;
|
||
unsigned int vec;
|
||
isr_t isr;
|
||
|
||
if (irq >= NINTR)
|
||
return 0;
|
||
|
||
intr = &intrupts[irq];
|
||
if (intr->inuse)
|
||
return 0;
|
||
|
||
vec = 0x08 + irq;
|
||
isr = isrs[irq];
|
||
|
||
/* setup real mode handler */
|
||
_go32_dpmi_get_real_mode_interrupt_vector (vec, &intr->old_rmhandler);
|
||
|
||
intr->new_rmhandler.pm_selector = _go32_my_cs();
|
||
intr->new_rmhandler.pm_offset = (u_long)isr;
|
||
if (_go32_dpmi_allocate_real_mode_callback_iret (&intr->new_rmhandler,
|
||
&intr->regs))
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
if (_go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->new_rmhandler))
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* setup protected mode handler */
|
||
_go32_dpmi_get_protected_mode_interrupt_vector(vec, &intr->old_pmhandler);
|
||
|
||
intr->new_pmhandler.pm_selector = _go32_my_cs();
|
||
intr->new_pmhandler.pm_offset = (u_long)isr;
|
||
_go32_dpmi_allocate_iret_wrapper (&intr->new_pmhandler);
|
||
|
||
if (_go32_dpmi_set_protected_mode_interrupt_vector(vec, &intr->new_pmhandler))
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* setup interrupt controller mask */
|
||
disable ();
|
||
outportb (ICU_MASK, inportb (ICU_MASK) & ~(1 << irq));
|
||
enable ();
|
||
|
||
intr->inuse = 1;
|
||
return intr;
|
||
}
|
||
|
||
|
||
static void
|
||
dos_unhookirq (intr)
|
||
struct intrupt *intr;
|
||
{
|
||
unsigned int irq, vec;
|
||
unsigned char mask;
|
||
|
||
irq = intr - intrupts;
|
||
vec = 0x08 + irq;
|
||
|
||
/* restore old interrupt mask bit */
|
||
mask = 1 << irq;
|
||
disable ();
|
||
outportb (ICU_MASK, inportb (ICU_MASK) | (mask & icu_oldmask));
|
||
enable ();
|
||
|
||
/* remove real mode handler */
|
||
_go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->old_rmhandler);
|
||
_go32_dpmi_free_real_mode_callback (&intr->new_rmhandler);
|
||
|
||
/* remove protected mode handler */
|
||
_go32_dpmi_set_protected_mode_interrupt_vector (vec, &intr->old_pmhandler);
|
||
_go32_dpmi_free_iret_wrapper (&intr->new_pmhandler);
|
||
intr->inuse = 0;
|
||
}
|
||
|
||
|
||
|
||
static int
|
||
dos_open (scb, name)
|
||
serial_t scb;
|
||
const char *name;
|
||
{
|
||
struct dos_ttystate *port;
|
||
int fd, i;
|
||
|
||
if (strncasecmp (name, "/dev/", 5) == 0)
|
||
name += 5;
|
||
else if (strncasecmp (name, "\\dev\\", 5) == 0)
|
||
name += 5;
|
||
|
||
if (strlen (name) != 4 || strncasecmp (name, "com", 3) != 0)
|
||
{
|
||
errno = ENOENT;
|
||
return -1;
|
||
}
|
||
|
||
if (name[3] < '1' || name[3] > '4')
|
||
{
|
||
errno = ENOENT;
|
||
return -1;
|
||
}
|
||
|
||
fd = name[3] - '1';
|
||
port = &ports[fd];
|
||
if (port->refcnt++ > 0)
|
||
{
|
||
/* Device already opened another user. Just point at it. */
|
||
scb->fd = fd;
|
||
return 0;
|
||
}
|
||
|
||
/* force access to ID reg */
|
||
outb(port, com_cfcr, 0);
|
||
outb(port, com_iir, 0);
|
||
for (i = 0; i < 17; i++) {
|
||
if ((inb(port, com_iir) & 0x38) == 0)
|
||
goto ok;
|
||
(void) inb(port, com_data); /* clear recv */
|
||
}
|
||
errno = ENODEV;
|
||
return -1;
|
||
|
||
ok:
|
||
/* disable all interrupts in chip */
|
||
outb(port, com_ier, 0);
|
||
|
||
/* tentatively enable 16550 fifo, and see if it responds */
|
||
outb(port, com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER);
|
||
sleep(1);
|
||
port->fifo = ((inb(port, com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK);
|
||
|
||
/* clear pending status reports. */
|
||
(void) inb(port, com_lsr);
|
||
(void) inb(port, com_msr);
|
||
|
||
/* enable external interrupt gate (to avoid floating IRQ) */
|
||
outb(port, com_mcr, MCR_IENABLE);
|
||
|
||
/* hook up interrupt handler and initialise icu */
|
||
port->intrupt = dos_hookirq (port->irq);
|
||
if (!port->intrupt)
|
||
{
|
||
outb(port, com_mcr, 0);
|
||
outb(port, com_fifo, 0);
|
||
errno = ENODEV;
|
||
return -1;
|
||
}
|
||
|
||
disable ();
|
||
|
||
/* record port */
|
||
port->intrupt->port = port;
|
||
scb->fd = fd;
|
||
|
||
/* clear rx buffer, tx busy flag and overflow count */
|
||
port->first = port->count = 0;
|
||
port->txbusy = 0;
|
||
port->oflo = 0;
|
||
|
||
/* set default baud rate and mode: 9600,8,n,1 */
|
||
i = dos_baudconv (port->baudrate = 9600);
|
||
outb(port, com_cfcr, CFCR_DLAB);
|
||
outb(port, com_dlbl, i & 0xff);
|
||
outb(port, com_dlbh, i >> 8);
|
||
outb(port, com_cfcr, CFCR_8BITS);
|
||
|
||
/* enable all interrupts */
|
||
outb(port, com_ier, IER_ETXRDY | IER_ERXRDY | IER_ERLS | IER_EMSC);
|
||
|
||
/* enable DTR & RTS */
|
||
outb(port, com_mcr, MCR_DTR | MCR_RTS | MCR_IENABLE);
|
||
|
||
enable ();
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
static void
|
||
dos_close (scb)
|
||
serial_t scb;
|
||
{
|
||
struct dos_ttystate *port;
|
||
struct intrupt *intrupt;
|
||
|
||
if (!scb)
|
||
return;
|
||
|
||
port = &ports[scb->fd];
|
||
|
||
if (port->refcnt-- > 1)
|
||
return;
|
||
|
||
if (!(intrupt = port->intrupt))
|
||
return;
|
||
|
||
/* disable interrupts, fifo, flow control */
|
||
disable ();
|
||
port->intrupt = 0;
|
||
intrupt->port = 0;
|
||
outb(port, com_fifo, 0);
|
||
outb(port, com_ier, 0);
|
||
enable ();
|
||
|
||
/* unhook handler, and disable interrupt gate */
|
||
dos_unhookirq (intrupt);
|
||
outb(port, com_mcr, 0);
|
||
|
||
/* Check for overflow errors */
|
||
if (port->oflo)
|
||
{
|
||
fprintf_unfiltered (gdb_stderr,
|
||
"Serial input overruns occurred.\n");
|
||
fprintf_unfiltered (gdb_stderr, "This system %s handle %d baud.\n",
|
||
port->fifo ? "cannot" : "needs a 16550 to",
|
||
port->baudrate);
|
||
}
|
||
}
|
||
|
||
|
||
|
||
static int
|
||
dos_noop (scb)
|
||
serial_t scb;
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
dos_raw (scb)
|
||
serial_t scb;
|
||
{
|
||
/* Always in raw mode */
|
||
}
|
||
|
||
static int
|
||
dos_readchar (scb, timeout)
|
||
serial_t scb;
|
||
int timeout;
|
||
{
|
||
struct dos_ttystate *port = &ports[scb->fd];
|
||
long then;
|
||
int c;
|
||
|
||
then = rawclock() + (timeout * RAWHZ);
|
||
while ((c = dos_getc (port)) < 0)
|
||
{
|
||
if (timeout >= 0 && (rawclock () - then) >= 0)
|
||
return SERIAL_TIMEOUT;
|
||
notice_quit ();
|
||
}
|
||
|
||
return c;
|
||
}
|
||
|
||
|
||
static serial_ttystate
|
||
dos_get_tty_state (scb)
|
||
serial_t scb;
|
||
{
|
||
struct dos_ttystate *port = &ports[scb->fd];
|
||
struct dos_ttystate *state;
|
||
|
||
state = (struct dos_ttystate *) xmalloc (sizeof *state);
|
||
*state = *port;
|
||
return (serial_ttystate) state;
|
||
}
|
||
|
||
static int
|
||
dos_set_tty_state (scb, ttystate)
|
||
serial_t scb;
|
||
serial_ttystate ttystate;
|
||
{
|
||
struct dos_ttystate *state;
|
||
|
||
state = (struct dos_ttystate *) ttystate;
|
||
dos_setbaudrate (scb, state->baudrate);
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
dos_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
|
||
serial_t scb;
|
||
serial_ttystate new_ttystate;
|
||
serial_ttystate old_ttystate;
|
||
{
|
||
struct dos_ttystate *state;
|
||
|
||
state = (struct dos_ttystate *) new_ttystate;
|
||
dos_setbaudrate (scb, state->baudrate);
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
dos_flush_input (scb)
|
||
serial_t scb;
|
||
{
|
||
struct dos_ttystate *port = &ports[scb->fd];
|
||
disable();
|
||
port->first = port->count = 0;
|
||
if (port->fifo)
|
||
outb(port, com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_TRIGGER);
|
||
enable();
|
||
}
|
||
|
||
static void
|
||
dos_print_tty_state (scb, ttystate)
|
||
serial_t scb;
|
||
serial_ttystate ttystate;
|
||
{
|
||
/* Nothing to print */
|
||
return;
|
||
}
|
||
|
||
static int
|
||
dos_baudconv (rate)
|
||
int rate;
|
||
{
|
||
long x, err;
|
||
|
||
if (rate <= 0)
|
||
return -1;
|
||
|
||
#define divrnd(n, q) (((n) * 2 / (q) + 1) / 2) /* divide and round off */
|
||
x = divrnd(COMTICK, rate);
|
||
if (x <= 0)
|
||
return -1;
|
||
|
||
err = divrnd(1000 * COMTICK, x * rate) - 1000;
|
||
if (err < 0)
|
||
err = -err;
|
||
if (err > SPEED_TOLERANCE)
|
||
return -1;
|
||
#undef divrnd
|
||
return x;
|
||
}
|
||
|
||
|
||
static int
|
||
dos_setbaudrate (scb, rate)
|
||
serial_t scb;
|
||
int rate;
|
||
{
|
||
struct dos_ttystate *port = &ports[scb->fd];
|
||
|
||
if (port->baudrate != rate)
|
||
{
|
||
int x;
|
||
|
||
x = dos_baudconv (rate);
|
||
if (x <= 0)
|
||
{
|
||
fprintf_unfiltered (gdb_stderr, "%d: impossible baudrate\n", rate);
|
||
errno = EINVAL;
|
||
return -1;
|
||
}
|
||
|
||
disable ();
|
||
outb(port, com_cfcr, CFCR_DLAB);
|
||
outb(port, com_dlbl, x & 0xff);
|
||
outb(port, com_dlbh, x >> 8);
|
||
outb(port, com_cfcr, CFCR_8BITS);
|
||
port->baudrate = rate;
|
||
enable ();
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
static int
|
||
dos_write (scb, str, len)
|
||
serial_t scb;
|
||
const char *str;
|
||
int len;
|
||
{
|
||
volatile struct dos_ttystate *port = &ports[scb->fd];
|
||
int fifosize = port->fifo ? 16 : 1;
|
||
long then;
|
||
int cnt;
|
||
|
||
while (len > 0)
|
||
{
|
||
/* send the data, fifosize bytes at a time */
|
||
cnt = fifosize > len ? len : fifosize;
|
||
port->txbusy = 1;
|
||
outportsb (port->base + com_data, str, cnt);
|
||
str += cnt;
|
||
len -= cnt;
|
||
#ifdef DOS_STATS
|
||
cnts[CNT_TX] += cnt;
|
||
#endif
|
||
/* wait for transmission to complete (max 1 sec) */
|
||
then = rawclock() + RAWHZ;
|
||
while (port->txbusy)
|
||
{
|
||
if ((rawclock () - then) >= 0)
|
||
{
|
||
errno = EIO;
|
||
return SERIAL_ERROR;
|
||
}
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
static int
|
||
dos_sendbreak (scb)
|
||
serial_t scb;
|
||
{
|
||
volatile struct dos_ttystate *port = &ports[scb->fd];
|
||
unsigned char cfcr;
|
||
long then;
|
||
|
||
cfcr = inb(port, com_cfcr);
|
||
outb(port, com_cfcr, cfcr | CFCR_SBREAK);
|
||
|
||
/* 0.25 sec delay */
|
||
then = rawclock () + RAWHZ / 4;
|
||
while ((rawclock () - then) < 0)
|
||
continue;
|
||
|
||
outb(port, com_cfcr, cfcr);
|
||
return 0;
|
||
}
|
||
|
||
|
||
static struct serial_ops dos_ops =
|
||
{
|
||
"hardwire",
|
||
0,
|
||
dos_open,
|
||
dos_close,
|
||
dos_readchar,
|
||
dos_write,
|
||
dos_noop, /* flush output */
|
||
dos_flush_input,
|
||
dos_sendbreak,
|
||
dos_raw,
|
||
dos_get_tty_state,
|
||
dos_set_tty_state,
|
||
dos_print_tty_state,
|
||
dos_noflush_set_tty_state,
|
||
dos_setbaudrate,
|
||
};
|
||
|
||
|
||
static void
|
||
dos_info (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
struct dos_ttystate *port;
|
||
int i;
|
||
|
||
for (port = ports; port < &ports[4]; port++)
|
||
{
|
||
if (port->baudrate == 0)
|
||
continue;
|
||
printf_filtered ("Port:\tCOM%d (%sactive)\n", port - ports + 1,
|
||
port->intrupt ? "" : "not ");
|
||
printf_filtered ("Addr:\t0x%03x (irq %d)\n", port->base, port->irq);
|
||
printf_filtered ("16550:\t%s\n", port->fifo ? "yes" : "no");
|
||
printf_filtered ("Speed:\t%d baud\n", port->baudrate);
|
||
printf_filtered ("Errs:\tframing %d parity %d overflow %d\n\n",
|
||
port->ferr, port->perr, port->oflo);
|
||
}
|
||
|
||
#ifdef DOS_STATS
|
||
printf_filtered ("\nTotal interrupts: %d\n", intrcnt);
|
||
for (i = 0; i < NCNT; i++)
|
||
if (cnts[i])
|
||
printf_filtered ("%s:\t%d\n", cntnames[i], cnts[i]);
|
||
#endif
|
||
}
|
||
|
||
|
||
void
|
||
_initialize_ser_dos ()
|
||
{
|
||
struct cmd_list_element *c;
|
||
|
||
serial_add_interface (&dos_ops);
|
||
|
||
/* Save original interrupt mask register. */
|
||
icu_oldmask = inportb (ICU_MASK);
|
||
|
||
/* Mark fixed motherboard irqs as inuse. */
|
||
intrupts[0].inuse = /* timer tick */
|
||
intrupts[1].inuse = /* keyboard */
|
||
intrupts[2].inuse = 1; /* slave icu */
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("com1base", class_obscure, var_zinteger,
|
||
(char *) &ports[0].base,
|
||
"Set COM1 base i/o port address.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("com1irq", class_obscure, var_zinteger,
|
||
(char *) &ports[0].irq,
|
||
"Set COM1 interrupt request.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("com2base", class_obscure, var_zinteger,
|
||
(char *) &ports[1].base,
|
||
"Set COM2 base i/o port address.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("com2irq", class_obscure, var_zinteger,
|
||
(char *) &ports[1].irq,
|
||
"Set COM2 interrupt request.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("com3base", class_obscure, var_zinteger,
|
||
(char *) &ports[2].base,
|
||
"Set COM3 base i/o port address.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("com3irq", class_obscure, var_zinteger,
|
||
(char *) &ports[2].irq,
|
||
"Set COM3 interrupt request.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("com4base", class_obscure, var_zinteger,
|
||
(char *) &ports[3].base,
|
||
"Set COM4 base i/o port address.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (
|
||
add_set_cmd ("com4irq", class_obscure, var_zinteger,
|
||
(char *) &ports[3].irq,
|
||
"Set COM4 interrupt request.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_info ("serial", dos_info,
|
||
"Print DOS serial port status.");
|
||
}
|