/* Remote serial interface for local (hardwired) serial ports for GO32.
- Copyright 1992, 1993 Free Software Foundation, Inc.
+ Copyright 1992, 1993, 2000, 2001 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.
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. */
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
+#include "gdbcmd.h"
#include "serial.h"
-#include <sys/dos.h>
+#include "gdb_string.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 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)
-#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 char *str, int len);
+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);
+
+#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 (volatile struct dos_ttystate *port)
+{
+ int c;
-static int iov[2];
+ if (port->count == 0)
+ return -1;
+
+ c = port->cbuf[port->first];
+ disable ();
+ port->first = (port->first + 1) & (CBSIZE - 1);
+ port->count--;
+ enable ();
+ return c;
+}
-#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_putc (int c, struct dos_ttystate *port)
{
- return GET_BYTE (aindex - OFFSET + p);
+ if (port->count >= CBSIZE - 1)
+ return -1;
+ port->cbuf[(port->first + port->count) & (CBSIZE - 1)] = c;
+ port->count++;
+ return 0;
}
+\f
-static unsigned long
-getivec (int which)
+
+static void
+dos_comisr (int irq)
{
- long tryaindex;
+ struct dos_ttystate *port;
+ unsigned char iir, lsr, c;
- if (GET_WORD (which * 4) != OFFSET)
- return 0;
+ disable (); /* Paranoia */
+ outportb (ICU_OCW2, 0x20); /* End-Of-Interrupt */
+#ifdef DOS_STATS
+ ++intrcnt;
+#endif
- /* Find out where in memory this lives */
- tryaindex = GET_WORD (which * 4 + 2) * 16 + GET_WORD (which * 4);
+ port = intrupts[irq].port;
+ if (!port)
+ {
+ COUNT (CNT_STRAY);
+ return; /* not open */
+ }
- if (GET_WORD (tryaindex + 2) != SIGNATURE)
- return 0;
- if (GET_WORD (tryaindex + 4) != VERSION)
- return 0;
- return tryaindex;
+ 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))
+ {
+ return 0;
+ }
+
+ if (_go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->new_rmhandler))
{
- case 1:
- aindex = getivec (12);
- break;
- case 2:
- aindex = getivec (11);
- break;
- default:
return 0;
}
- if (!aindex)
+ /* 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))
{
- 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;
}
- 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;
+
+ if (strncasecmp (name, "/dev/", 5) == 0)
+ name += 5;
+ else if (strncasecmp (name, "\\dev\\", 5) == 0)
+ name += 5;
- while (!dos_async_ready ())
+ 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 ();
- if ((port != 1) && (port != 2))
- {
- errno = ENOENT;
- return -11;
- }
+ /* record port */
+ port->intrupt->port = port;
+ scb->fd = fd;
- scb->fd = dos_async_init (port);
- if (!scb->fd)
- return -1;
+ /* 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->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);
+ }
+}
+\f
+
+
static int
-go32_noop (scb)
- serial_t scb;
+dos_noop (struct serial *scb)
{
return 0;
}
static void
-go32_raw (scb)
- serial_t scb;
+dos_raw (struct serial *scb)
{
/* 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;
+ 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 go32_ttystate *state;
+ struct dos_ttystate *port = &ports[scb->fd];
+ struct dos_ttystate *state;
- state = (struct go32_ttystate *) xmalloc (sizeof *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 beacuse 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 = (struct dos_ttystate *) xmalloc (sizeof *state);
+ *state = *port;
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
+dos_noflush_set_tty_state (struct serial *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
-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. */
+ /* 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 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;
+ /* 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;
+ len -= cnt;
+#else
+ for ( ; cnt > 0; cnt--, len--)
+ 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 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,
+ 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,
+ dos_setstopbits,
+ dos_noop, /* wait for output to drain */
+ (void (*)(struct serial *, int))NULL /* change into async mode */
};
+
+static void
+dos_info (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%d\n", cntnames[i], cnts[i]);
+#endif
+}
+
+
void
-_initialize_ser_go32 ()
+_initialize_ser_dos (void)
{
- 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 */
+
+ deprecated_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);
+
+ deprecated_add_show_from_set
+ (add_set_cmd ("com1irq", class_obscure, var_zinteger,
+ (char *) &ports[0].irq,
+ "Set COM1 interrupt request.",
+ &setlist),
+ &showlist);
+
+ deprecated_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);
+
+ deprecated_add_show_from_set
+ (add_set_cmd ("com2irq", class_obscure, var_zinteger,
+ (char *) &ports[1].irq,
+ "Set COM2 interrupt request.",
+ &setlist),
+ &showlist);
+
+ deprecated_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);
+
+ deprecated_add_show_from_set
+ (add_set_cmd ("com3irq", class_obscure, var_zinteger,
+ (char *) &ports[2].irq,
+ "Set COM3 interrupt request.",
+ &setlist),
+ &showlist);
+
+ deprecated_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);
+
+ deprecated_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."));
}
projects / deliverable / binutils-gdb.git / blobdiff