/* Remote serial interface for local (hardwired) serial ports for GO32.
- Copyright 1992, 1993 Free Software Foundation, Inc.
+ Copyright (C) 1992-2020 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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "gdbcmd.h"
#include "serial.h"
-#include <sys/dos.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 <time.h>
+#include <dos.h>
+#include <go32.h>
+#include <dpmi.h>
+typedef unsigned long u_long;
+
+/* 16550 rx fifo trigger point */
+#define FIFO_TRIGGER FIFO_TRIGGER_4
+
+/* input buffer size */
+#define CBSIZE 4096
+
+#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 size_t 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)
-#define disable() asm("cli")
-#define enable() asm("sti")
+/* Original interrupt controller mask register. */
+unsigned char icu_oldmask;
-struct go32_ttystate
+/* Maximum of 8 interrupts (we don't handle the slave icu yet). */
+#define NINTR 8
+
+static struct intrupt
{
- int bogus;
- };
-typedef struct
+ 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
{
- short jmp_op;
- short signature;
- short version;
- short buffer_start;
- short buffer_end;
- short getp;
- short putp;
- short iov;
- short count;
- short overflow;
- short buffer_size;
- short ovflushes;
+ 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;
}
-ASYNC_STRUCT;
-
-#define AOFF_JMP_OP 0
-#define AOFF_SIGNATURE 2
-#define AOFF_VERSION 4
-#define AOFF_BUFFER_START 6
-#define AOFF_BUFFER_END 8
-#define AOFF_GETP 10
-#define AOFF_PUTP 12
-#define AOFF_IOV 14
-#define AOFF_COUNT 16
-#define AOFF_OVERFLOW 18
-#define AOFF_BUFFER_SIZE 20
-#define AOFF_OVFLUSHES 22
-
-
-static ASYNC_STRUCT a; /* Copy in our mem of the struct */
-static long aindex; /* index into dos space of struct */
-
-static int go32_open PARAMS ((serial_t scb, const char *name));
-static void go32_raw PARAMS ((serial_t scb));
-static int go32_readchar PARAMS ((serial_t scb, int timeout));
-static int go32_setbaudrate PARAMS ((serial_t scb, int rate));
-static int go32_write PARAMS ((serial_t scb, const char *str, int len));
-static void go32_close PARAMS ((serial_t scb));
-static serial_ttystate go32_get_tty_state PARAMS ((serial_t scb));
-static int go32_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
-static unsigned char aptr PARAMS ((short p));
-static unsigned long getivec PARAMS ((int which));
-static int dos_async_init PARAMS ((int port));
-static void dos_async_tx PARAMS ((const char c));
-static int dos_async_rx PARAMS (());
-static int dosasync_read PARAMS ((int fd, char *buf, int len, int timeout));
-static int dosasync_write PARAMS ((int fd, const char *buf, int len));
-
-#define SIGNATURE 0x4154
-#define VERSION 1
-#define OFFSET 0x104
-
-unsigned char bb;
-unsigned short sb;
-unsigned long sl;
-
-#define SET_BYTE(x,y) { char _buf = y;dosmemput(&_buf,1, x);}
-#define SET_WORD(x,y) { short _buf = y;dosmemput(&_buf,2, x);}
-#define GET_BYTE(x) ( dosmemget((x),1,&bb), bb)
-
-
-#define GET_LONG(x) ( dosmemget((x),4,&sl), sl)
-
-static
-unsigned short
-GET_WORD (x)
+ports[4] =
{
- unsigned short sb;
- dosmemget ((x), 2, &sb);
- return sb;
-}
+ {
+ COM1ADDR, 4, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0
+ }
+ ,
+ {
+ COM2ADDR, 3, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0
+ }
+ ,
+ {
+ COM3ADDR, 4, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0
+ }
+ ,
+ {
+ COM4ADDR, 3, 0, NULL, 0, 0, "", 0, 0, 0, 0, 0, 0, 0, 0
+ }
+};
+
+static int dos_open (struct serial *scb, const char *name);
+static void dos_raw (struct serial *scb);
+static int dos_readchar (struct serial *scb, int timeout);
+static int dos_setbaudrate (struct serial *scb, int rate);
+static int dos_write (struct serial *scb, const void *buf, size_t count);
+static void dos_close (struct serial *scb);
+static serial_ttystate dos_get_tty_state (struct serial *scb);
+static int dos_set_tty_state (struct serial *scb, serial_ttystate state);
+static int dos_baudconv (int rate);
-static int iov[2];
+#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");
-#define com_rb(n) iov[n]
-#define com_tb(n) iov[n]
-#define com_ier(n) iov[n]+1
-#define com_ifr(n) iov[n]+2
-#define com_bfr(n) iov[n]+3
-#define com_mcr(n) iov[n]+4
-#define com_lsr(n) iov[n]+5
-#define com_msr(n) iov[n]+6
-static unsigned char
-aptr (p)
- short p;
+static int
+dos_getc (volatile struct dos_ttystate *port)
{
- return GET_BYTE (aindex - OFFSET + p);
+ 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 unsigned long
-getivec (int which)
+
+static int
+dos_putc (int c, struct dos_ttystate *port)
{
- long tryaindex;
+ if (port->count >= CBSIZE - 1)
+ return -1;
+ port->cbuf[(port->first + port->count) & (CBSIZE - 1)] = c;
+ port->count++;
+ return 0;
+}
+\f
- if (GET_WORD (which * 4) != OFFSET)
- return 0;
- /* Find out where in memory this lives */
- tryaindex = GET_WORD (which * 4 + 2) * 16 + GET_WORD (which * 4);
+static void
+dos_comisr (int irq)
+{
+ struct dos_ttystate *port;
+ unsigned char iir, lsr, c;
- if (GET_WORD (tryaindex + 2) != SIGNATURE)
- return 0;
- if (GET_WORD (tryaindex + 4) != VERSION)
- return 0;
- return tryaindex;
+ 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);
+ }
}
-static int
-dos_async_init (port)
- int port;
+#define ISRNAME(x) dos_comisr##x
+#define ISR(x) static void ISRNAME(x)(void) {dos_comisr(x);}
+
+ISR (0) ISR (1) ISR (2) ISR (3) /* OK */
+ISR (4) ISR (5) ISR (6) ISR (7) /* OK */
+
+typedef void (*isr_t) (void);
+
+static isr_t isrs[NINTR] =
+ {
+ ISRNAME (0), ISRNAME (1), ISRNAME (2), ISRNAME (3),
+ ISRNAME (4), ISRNAME (5), ISRNAME (6), ISRNAME (7)
+ };
+\f
+
+
+static struct intrupt *
+dos_hookirq (unsigned int irq)
{
- switch (port)
+ 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))
{
- case 1:
- aindex = getivec (12);
- break;
- case 2:
- aindex = getivec (11);
- break;
- default:
return 0;
}
- if (!aindex)
+ if (_go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->new_rmhandler))
{
- error ("GDB cannot connect to asynctsr program, check that it is installed\n\
-and that serial I/O is not being redirected (perhaps by NFS)\n\n\
-example configuration:\n\
-C> mode com%d:9600,n,8,1,p\n\
-C> asynctsr %d\n\
-C> gdb \n", port, port);
+ 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;
}
- iov[0] = GET_WORD (aindex + AOFF_IOV);
- outportb (com_ier (0), 0x0f);
- outportb (com_bfr (0), 0x03);
- outportb (com_mcr (0), 0x0b);
- return 1;
+ /* Setup interrupt controller mask. */
+ disable ();
+ outportb (ICU_MASK, inportb (ICU_MASK) & ~(1 << irq));
+ enable ();
+
+ intr->inuse = 1;
+ return intr;
}
+
static void
-dos_async_tx (c)
- const char c;
+dos_unhookirq (struct intrupt *intr)
{
- while (~inportb (com_lsr (0)) & 0x20)
- ;
- outportb (com_tb (0), c);
-}
+ unsigned int irq, vec;
+ unsigned char mask;
-static int
-dos_async_ready ()
-{
- int ret;
+ irq = intr - intrupts;
+ vec = 0x08 + irq;
+ /* Restore old interrupt mask bit. */
+ mask = 1 << irq;
disable ();
-#if RDY_CNT
- ret = GET_WORD (aindex + AOFF_COUNT);
-#else
- ret = GET_WORD (aindex + AOFF_GETP) != GET_WORD (aindex + AOFF_PUTP);
-#endif
+ outportb (ICU_MASK, inportb (ICU_MASK) | (mask & icu_oldmask));
enable ();
- return ret;
+ /* 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;
}
+\f
+
static int
-dos_async_rx ()
+dos_open (struct serial *scb, const char *name)
{
- char rv;
- short idx;
+ struct dos_ttystate *port;
+ int fd, i;
- while (!dos_async_ready ())
+ 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)
{
- if (kbhit ())
- {
- printf_unfiltered ("abort!\n");
- return 0;
- }
+ errno = ENOENT;
+ return -1;
}
- disable ();
- idx = GET_WORD (aindex + AOFF_GETP);
- idx++;
- SET_WORD (aindex + AOFF_GETP, idx);
- rv = aptr (idx - 1);
- SET_WORD (aindex + AOFF_COUNT, GET_WORD (aindex + AOFF_COUNT) - 1);
- if (GET_WORD (aindex + AOFF_GETP) > GET_WORD (aindex + AOFF_BUFFER_END))
- SET_WORD (aindex + AOFF_GETP, GET_WORD (aindex + AOFF_BUFFER_START));
- enable ();
- return rv;
-}
+ if (name[3] < '1' || name[3] > '4')
+ {
+ errno = ENOENT;
+ return -1;
+ }
-static int
-dosasync_read (fd, buf, len, timeout)
- int fd;
- char *buf;
- int len;
- int timeout;
-{
- long now, then;
- int i;
-
- time (&now);
- then = now + timeout;
+ /* FIXME: this is a Bad Idea (tm)! One should *never* invent file
+ handles, since they might be already used by other files/devices.
+ The Right Way to do this is to create a real handle by dup()'ing
+ some existing one. */
+ 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;
+ }
- for (i = 0; i < len; i++)
+ /* Force access to ID reg. */
+ outb (port, com_cfcr, 0);
+ outb (port, com_iir, 0);
+ for (i = 0; i < 17; i++)
{
- if (timeout)
- {
- while (!dos_async_ready ())
- {
- time (&now);
- if (now >= then && timeout > 0)
- return i;
- }
- }
- *buf++ = dos_async_rx ();
+ if ((inb (port, com_iir) & 0x38) == 0)
+ goto ok;
+ (void) inb (port, com_data); /* clear recv */
}
- return len;
-}
+ errno = ENODEV;
+ return -1;
-static int
-dosasync_write (fd, buf, len)
- int fd;
- const char *buf;
- int len;
-{
- int l;
+ok:
+ /* Disable all interrupts in chip. */
+ outb (port, com_ier, 0);
- for (l = 0; l < len; l++)
- dos_async_tx (*buf++);
+ /* 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);
- return len;
-}
+ /* clear pending status reports. */
+ (void) inb (port, com_lsr);
+ (void) inb (port, com_msr);
-static int
-go32_open (scb, name)
- serial_t scb;
- const char *name;
-{
- int port;
+ /* Enable external interrupt gate (to avoid floating IRQ). */
+ outb (port, com_mcr, MCR_IENABLE);
- if (strncasecmp (name, "com", 3) != 0)
+ /* Hook up interrupt handler and initialise icu. */
+ port->intrupt = dos_hookirq (port->irq);
+ if (!port->intrupt)
{
- errno = ENOENT;
+ outb (port, com_mcr, 0);
+ outb (port, com_fifo, 0);
+ errno = ENODEV;
return -1;
}
- port = name[3] - '0';
+ 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 (struct serial *scb)
+{
+ struct dos_ttystate *port;
+ struct intrupt *intrupt;
+
+ if (!scb)
+ return;
+
+ port = &ports[scb->fd];
- if ((port != 1) && (port != 2))
+ 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)
{
- errno = ENOENT;
- return -11;
+ 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);
}
+}
+\f
- scb->fd = dos_async_init (port);
- if (!scb->fd)
- return -1;
+/* Implementation of the serial_ops flush_output method. */
+
+static int
+dos_flush_output (struct serial *scb)
+{
+ return 0;
+}
+
+/* Implementation of the serial_ops setparity method. */
+static int
+dos_setparity (struct serial *scb, int parity)
+{
return 0;
}
+/* Implementation of the serial_ops drain_output method. */
+
static int
-go32_noop (scb)
- serial_t scb;
+dos_drain_output (struct serial *scb)
{
return 0;
}
static void
-go32_raw (scb)
- serial_t scb;
+dos_raw (struct serial *scb)
{
- /* Always in raw mode */
+ /* Always in raw mode. */
}
static int
-go32_readchar (scb, timeout)
- serial_t scb;
- int timeout;
+dos_readchar (struct serial *scb, int timeout)
{
- char buf;
-
+ struct dos_ttystate *port = &ports[scb->fd];
+ long then;
+ int c;
- /* Shortcut for polling */
- if (timeout == 0)
+ then = rawclock () + (timeout * RAWHZ);
+ while ((c = dos_getc (port)) < 0)
{
- if (dos_async_ready ())
- {
- return dos_async_rx ();
- }
- return SERIAL_TIMEOUT;
+ QUIT;
+
+ if (timeout >= 0 && (rawclock () - then) >= 0)
+ return SERIAL_TIMEOUT;
}
- if (dosasync_read (scb->fd, &buf, 1, timeout))
- return buf;
- else
- return SERIAL_TIMEOUT;
+ return c;
}
-/* go32_{get set}_tty_state() are both dummys to fill out the function
- vector. Someday, they may do something real... */
static serial_ttystate
-go32_get_tty_state (scb)
- serial_t scb;
+dos_get_tty_state (struct serial *scb)
+{
+ struct dos_ttystate *port = &ports[scb->fd];
+ struct dos_ttystate *state;
+
+ /* Are they asking about a port we opened? */
+ if (port->refcnt <= 0)
+ {
+ /* We've never heard about this port. We should fail this call,
+ unless they are asking about one of the 3 standard handles,
+ in which case we pretend the handle was open by us if it is
+ connected to a terminal device. This is because Unix
+ terminals use the serial interface, so GDB expects the
+ standard handles to go through here. */
+ if (scb->fd >= 3 || !isatty (scb->fd))
+ return NULL;
+ }
+
+ state = XNEW (struct dos_ttystate);
+ *state = *port;
+ return (serial_ttystate) state;
+}
+
+static serial_ttystate
+dos_copy_tty_state (struct serial *scb, serial_ttystate ttystate)
{
- struct go32_ttystate *state;
+ struct dos_ttystate *state;
- state = (struct go32_ttystate *) xmalloc (sizeof *state);
+ state = XNEW (struct dos_ttystate);
+ *state = *(struct dos_ttystate *) ttystate;
return (serial_ttystate) state;
}
static int
-go32_set_tty_state (scb, ttystate)
- serial_t scb;
- serial_ttystate ttystate;
+dos_set_tty_state (struct serial *scb, serial_ttystate ttystate)
{
+ struct dos_ttystate *state;
+
+ state = (struct dos_ttystate *) ttystate;
+ dos_setbaudrate (scb, state->baudrate);
return 0;
}
static int
-go32_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
- serial_t scb;
- serial_ttystate new_ttystate;
- serial_ttystate old_ttystate;
+dos_flush_input (struct serial *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 ();
return 0;
}
static void
-go32_print_tty_state (scb, ttystate)
- serial_t scb;
- serial_ttystate ttystate;
+dos_print_tty_state (struct serial *scb, serial_ttystate ttystate,
+ struct ui_file *stream)
{
/* Nothing to print. */
return;
}
static int
-go32_setbaudrate (scb, rate)
- serial_t scb;
- int rate;
+dos_baudconv (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 (struct serial *scb, int rate)
{
+ struct dos_ttystate *port = &ports[scb->fd];
+
+ if (port->baudrate != rate)
+ {
+ int x;
+ unsigned char cfcr;
+
+ x = dos_baudconv (rate);
+ if (x <= 0)
+ {
+ fprintf_unfiltered (gdb_stderr, "%d: impossible baudrate\n", rate);
+ errno = EINVAL;
+ return -1;
+ }
+
+ disable ();
+ cfcr = inb (port, com_cfcr);
+
+ outb (port, com_cfcr, CFCR_DLAB);
+ outb (port, com_dlbl, x & 0xff);
+ outb (port, com_dlbh, x >> 8);
+ outb (port, com_cfcr, cfcr);
+ port->baudrate = rate;
+ enable ();
+ }
+
return 0;
}
static int
-go32_write (scb, str, len)
- serial_t scb;
- const char *str;
- int len;
+dos_setstopbits (struct serial *scb, int num)
{
- dosasync_write (scb->fd, str, len);
+ struct dos_ttystate *port = &ports[scb->fd];
+ unsigned char cfcr;
+
+ disable ();
+ cfcr = inb (port, com_cfcr);
+
+ switch (num)
+ {
+ case SERIAL_1_STOPBITS:
+ outb (port, com_cfcr, cfcr & ~CFCR_STOPB);
+ break;
+ case SERIAL_1_AND_A_HALF_STOPBITS:
+ case SERIAL_2_STOPBITS:
+ outb (port, com_cfcr, cfcr | CFCR_STOPB);
+ break;
+ default:
+ enable ();
+ return 1;
+ }
+ enable ();
return 0;
}
-static void
-go32_close (scb)
- serial_t scb;
+static int
+dos_write (struct serial *scb, const void *buf, size_t count)
+{
+ volatile struct dos_ttystate *port = &ports[scb->fd];
+ size_t fifosize = port->fifo ? 16 : 1;
+ long then;
+ size_t cnt;
+ const char *str = (const char *) buf;
+
+ while (count > 0)
+ {
+ QUIT;
+
+ /* Send the data, fifosize bytes at a time. */
+ cnt = fifosize > count ? count : fifosize;
+ port->txbusy = 1;
+ /* Francisco Pastor <fpastor.etra-id@etra.es> says OUTSB messes
+ up the communications with UARTs with FIFOs. */
+#ifdef UART_FIFO_WORKS
+ outportsb (port->base + com_data, str, cnt);
+ str += cnt;
+ count -= cnt;
+#else
+ for ( ; cnt > 0; cnt--, count--)
+ outportb (port->base + com_data, *str++);
+#endif
+#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 (struct serial *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 go32_ops =
+
+static const struct serial_ops dos_ops =
{
"hardwire",
- 0,
- go32_open,
- go32_close,
- go32_readchar,
- go32_write,
- go32_noop, /* flush output */
- go32_noop, /* flush input */
- go32_noop, /* send break -- currently used only for nindy */
- go32_raw,
- go32_get_tty_state,
- go32_set_tty_state,
- go32_print_tty_state,
- go32_noflush_set_tty_state,
- go32_setbaudrate,
+ dos_open,
+ dos_close,
+ NULL, /* fdopen, not implemented */
+ dos_readchar,
+ dos_write,
+ dos_flush_output,
+ dos_flush_input,
+ dos_sendbreak,
+ dos_raw,
+ dos_get_tty_state,
+ dos_copy_tty_state,
+ dos_set_tty_state,
+ dos_print_tty_state,
+ dos_setbaudrate,
+ dos_setstopbits,
+ dos_setparity,
+ dos_drain_output,
+ (void (*)(struct serial *, int))NULL /* Change into async mode. */
};
+int
+gdb_pipe (int pdes[2])
+{
+ /* No support for pipes. */
+ errno = ENOSYS;
+ return -1;
+}
+
+static void
+info_serial_command (const char *arg, int from_tty)
+{
+ struct dos_ttystate *port;
+#ifdef DOS_STATS
+ int i;
+#endif
+
+ for (port = ports; port < &ports[4]; port++)
+ {
+ if (port->baudrate == 0)
+ continue;
+ printf_filtered ("Port:\tCOM%ld (%sactive)\n", (long)(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%lu\n", cntnames[i], (unsigned long) cnts[i]);
+#endif
+}
+
+void _initialize_ser_dos ();
void
-_initialize_ser_go32 ()
+_initialize_ser_dos ()
{
- serial_add_interface (&go32_ops);
+ 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_setshow_zinteger_cmd ("com1base", class_obscure, &ports[0].base, _("\
+Set COM1 base i/o port address."), _("\
+Show COM1 base i/o port address."), NULL,
+ NULL,
+ NULL, /* FIXME: i18n: */
+ &setlist, &showlist);
+
+ add_setshow_zinteger_cmd ("com1irq", class_obscure, &ports[0].irq, _("\
+Set COM1 interrupt request."), _("\
+Show COM1 interrupt request."), NULL,
+ NULL,
+ NULL, /* FIXME: i18n: */
+ &setlist, &showlist);
+
+ add_setshow_zinteger_cmd ("com2base", class_obscure, &ports[1].base, _("\
+Set COM2 base i/o port address."), _("\
+Show COM2 base i/o port address."), NULL,
+ NULL,
+ NULL, /* FIXME: i18n: */
+ &setlist, &showlist);
+
+ add_setshow_zinteger_cmd ("com2irq", class_obscure, &ports[1].irq, _("\
+Set COM2 interrupt request."), _("\
+Show COM2 interrupt request."), NULL,
+ NULL,
+ NULL, /* FIXME: i18n: */
+ &setlist, &showlist);
+
+ add_setshow_zinteger_cmd ("com3base", class_obscure, &ports[2].base, _("\
+Set COM3 base i/o port address."), _("\
+Show COM3 base i/o port address."), NULL,
+ NULL,
+ NULL, /* FIXME: i18n: */
+ &setlist, &showlist);
+
+ add_setshow_zinteger_cmd ("com3irq", class_obscure, &ports[2].irq, _("\
+Set COM3 interrupt request."), _("\
+Show COM3 interrupt request."), NULL,
+ NULL,
+ NULL, /* FIXME: i18n: */
+ &setlist, &showlist);
+
+ add_setshow_zinteger_cmd ("com4base", class_obscure, &ports[3].base, _("\
+Set COM4 base i/o port address."), _("\
+Show COM4 base i/o port address."), NULL,
+ NULL,
+ NULL, /* FIXME: i18n: */
+ &setlist, &showlist);
+
+ add_setshow_zinteger_cmd ("com4irq", class_obscure, &ports[3].irq, _("\
+Set COM4 interrupt request."), _("\
+Show COM4 interrupt request."), NULL,
+ NULL,
+ NULL, /* FIXME: i18n: */
+ &setlist, &showlist);
+
+ add_info ("serial", info_serial_command,
+ _("Print DOS serial port status."));
}
projects / deliverable / binutils-gdb.git / blobdiff