471 lines
9.6 KiB
C
471 lines
9.6 KiB
C
/* Remote serial interface using Hitachi E7000 PC ISA card in a PC
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Copyright 1994, 1999, 2000 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#if defined __GO32__ || defined _WIN32
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#include "defs.h"
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#include "serial.h"
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#include "gdb_string.h"
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/* MSVC uses strnicmp instead of strncasecmp */
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#ifdef _MSC_VER
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#define strncasecmp strnicmp
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#define WIN32_LEAN_AND_MEAN
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#ifdef __GO32__
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#include <sys/dos.h>
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#endif
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static int e7000pc_open (serial_t scb, const char *name);
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static void e7000pc_raw (serial_t scb);
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static int e7000pc_readchar (serial_t scb, int timeout);
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static int e7000pc_setbaudrate (serial_t scb, int rate);
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static int e7000pc_write (serial_t scb, const char *str, int len);
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static void e7000pc_close (serial_t scb);
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static serial_ttystate e7000pc_get_tty_state (serial_t scb);
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static int e7000pc_set_tty_state (serial_t scb, serial_ttystate state);
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#define OFF_DPD 0x0000
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#define OFF_DDP 0x1000
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#define OFF_CPD 0x2000
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#define OFF_CDP 0x2400
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#define OFF_FA 0x3000
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#define OFF_FB 0x3002
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#define OFF_FC 0x3004
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#define OFF_IRQTOD 0x3008
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#define OFF_IRQTOP 0x300a
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#define OFF_READY 0x300c
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#define OFF_PON 0x300e
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#define IDLE 0x0000
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#define CMD_CI 0x4349
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#define CMD_CO 0x434f
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#define CMD_LO 0x4c4f
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#define CMD_LS 0x4c53
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#define CMD_SV 0x5356
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#define CMD_SS 0x5353
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#define CMD_OK 0x4f4b
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#define CMD_ER 0x4552
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#define CMD_NF 0x4e46
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#define CMD_AB 0x4142
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#define CMD_ED 0x4544
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#define CMD_CE 0x4345
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static unsigned long fa;
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static unsigned long irqtod;
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static unsigned long ready;
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static unsigned long fb;
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static unsigned long cpd;
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static unsigned long cdp;
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static unsigned long ready;
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static unsigned long pon;
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static unsigned long irqtop;
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static unsigned long board_at;
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#ifdef __GO32__
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#define SET_BYTE(x,y) { char _buf = y;dosmemput(&_buf,1, x);}
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#define SET_WORD(x,y) { short _buf = y;dosmemput(&_buf,2, x);}
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#define GET_BYTE(x) ( dosmemget(x,1,&bb), bb)
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#define GET_WORD(x) ( dosmemget(x,2,&sb), sb)
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static unsigned char bb;
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static unsigned short sb;
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#else /* win32 */
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#define SET_BYTE(x,y) *(volatile unsigned char *)(x) = (y)
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#define SET_WORD(x,y) *(volatile unsigned short *)(x) = (y)
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#define GET_BYTE(x) (*(volatile unsigned char *)(x))
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#define GET_WORD(x) (*(volatile unsigned short *)(x))
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#define dosmemget(FROM, LEN, TO) memcpy ((void *)(TO), (void *)(FROM), (LEN))
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#define dosmemput(FROM, LEN, TO) memcpy ((void *)(TO), (void *)(FROM), (LEN))
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#endif
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static struct sw
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{
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int sw;
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int addr;
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}
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sigs[] =
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{
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{
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0x14, 0xd0000
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}
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,
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{
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0x15, 0xd4000
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}
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,
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{
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0x16, 0xd8000
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}
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,
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{
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0x17, 0xdc000
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}
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,
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0
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};
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#ifdef _MSC_VER
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/* Get the base of the data segment. This is needed to calculate the offset
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between data segment addresses and the base of linear memory, which is where
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device registers reside. Note that this is really only necessary for
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Win32s, since Win95 and NT keep the data segment at linear 0. */
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static unsigned long
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get_ds_base (void)
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{
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unsigned short dsval;
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LDT_ENTRY ldt;
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unsigned long dsbase;
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__asm
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{
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mov dsval, ds
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}
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dsbase = 0;
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GetThreadSelectorEntry (GetCurrentThread (), dsval, &ldt);
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dsbase = ldt.HighWord.Bits.BaseHi << 24 | ldt.HighWord.Bits.BaseMid << 16
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| ldt.BaseLow;
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return dsbase;
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}
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#else /* !_MSC_VER */
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#define get_ds_base() 0
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#endif /* _MSC_VER */
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static int
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e7000pc_init (void)
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{
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int try;
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unsigned long dsbase;
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dsbase = get_ds_base ();
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/* Look around in memory for the board's signature */
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for (try = 0; sigs[try].sw; try++)
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{
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int val;
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board_at = sigs[try].addr - dsbase;
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fa = board_at + OFF_FA;
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fb = board_at + OFF_FB;
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cpd = board_at + OFF_CPD;
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cdp = board_at + OFF_CDP;
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ready = board_at + OFF_READY;
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pon = board_at + OFF_PON;
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irqtop = board_at + OFF_IRQTOP;
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irqtod = board_at + OFF_IRQTOD;
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val = GET_WORD (ready);
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if (val == (0xaaa0 | sigs[try].sw))
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{
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if (GET_WORD (pon) & 0xf)
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{
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SET_WORD (fa, 0);
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SET_WORD (fb, 0);
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SET_WORD (irqtop, 1); /* Disable interrupts from e7000 */
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SET_WORD (ready, 1);
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printf_filtered ("\nConnected to the E7000PC at address 0x%x\n",
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sigs[try].addr);
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return 1;
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}
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error ("The E7000 PC board is working, but the E7000 is turned off.\n");
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return 0;
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}
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}
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error ("GDB cannot connect to the E7000 PC board, check that it is installed\n\
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and that the switch settings are correct. Some other DOS programs can \n\
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stop the board from working. Try starting from a very minimal boot, \n\
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perhaps you need to disable EMM386 over the region where the board has\n\
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its I/O space, remove other unneeded cards, etc etc\n");
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return 0;
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}
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static int pbuf_size;
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static int pbuf_index;
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/* Return next byte from cdp. If no more, then return -1. */
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static int
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e7000_get (void)
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{
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static char pbuf[1000];
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char tmp[1000];
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int x;
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if (pbuf_index < pbuf_size)
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{
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x = pbuf[pbuf_index++];
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}
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else if ((GET_WORD (fb) & 1))
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{
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int i;
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pbuf_size = GET_WORD (cdp + 2);
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dosmemget (cdp + 8, pbuf_size + 1, tmp);
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/* Tell the E7000 we've eaten */
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SET_WORD (fb, 0);
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/* Swap it around */
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for (i = 0; i < pbuf_size; i++)
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{
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pbuf[i] = tmp[i ^ 1];
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}
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pbuf_index = 0;
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x = pbuf[pbuf_index++];
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}
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else
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{
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x = -1;
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}
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return x;
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}
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/* Works just like read(), except that it takes a TIMEOUT in seconds. Note
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that TIMEOUT == 0 is a poll, and TIMEOUT == -1 means wait forever. */
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static int
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dosasync_read (int fd, char *buf, int len, int timeout)
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{
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long now;
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long then;
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int i = 0;
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/* Then look for some more if we're still hungry */
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time (&now);
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then = now + timeout;
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while (i < len)
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{
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int ch = e7000_get ();
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/* While there's room in the buffer, and we've already
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read the stuff in, suck it over */
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if (ch != -1)
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{
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buf[i++] = ch;
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while (i < len && pbuf_index < pbuf_size)
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{
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ch = e7000_get ();
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if (ch == -1)
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break;
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buf[i++] = ch;
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}
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}
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time (&now);
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if (timeout == 0)
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return i;
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if (now >= then && timeout > 0)
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{
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return i;
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}
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}
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return len;
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}
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static int
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dosasync_write (int fd, const char *buf, int len)
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{
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int i;
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char dummy[1000];
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/* Construct copy locally */
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((short *) dummy)[0] = CMD_CI;
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((short *) dummy)[1] = len;
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((short *) dummy)[2] = 0;
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((short *) dummy)[3] = 0;
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for (i = 0; i < len; i++)
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{
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dummy[(8 + i) ^ 1] = buf[i];
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}
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/* Wait for the card to get ready */
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while (GET_WORD (fa) & 1);
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/* Blast onto the ISA card */
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dosmemput (dummy, 8 + len + 1, cpd);
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SET_WORD (fa, 1);
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SET_WORD (irqtod, 1); /* Interrupt the E7000 */
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return len;
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}
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static int
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e7000pc_open (serial_t scb, const char *name)
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{
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if (strncasecmp (name, "pc", 2) != 0)
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{
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errno = ENOENT;
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return -1;
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}
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scb->fd = e7000pc_init ();
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if (!scb->fd)
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return -1;
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return 0;
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}
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static int
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e7000pc_noop (serial_t scb)
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{
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return 0;
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}
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static void
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e7000pc_raw (serial_t scb)
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{
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/* Always in raw mode */
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}
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static int
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e7000pc_readchar (serial_t scb, int timeout)
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{
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char buf;
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top:
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if (dosasync_read (scb->fd, &buf, 1, timeout))
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{
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if (buf == 0)
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goto top;
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return buf;
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}
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else
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return SERIAL_TIMEOUT;
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}
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struct e7000pc_ttystate
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{
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int dummy;
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};
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/* e7000pc_{get set}_tty_state() are both dummys to fill out the function
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vector. Someday, they may do something real... */
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static serial_ttystate
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e7000pc_get_tty_state (serial_t scb)
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{
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struct e7000pc_ttystate *state;
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state = (struct e7000pc_ttystate *) xmalloc (sizeof *state);
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return (serial_ttystate) state;
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}
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static int
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e7000pc_set_tty_state (serial_t scb, serial_ttystate ttystate)
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{
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return 0;
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}
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static int
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e7000pc_noflush_set_tty_state (serial_t scb, serial_ttystate new_ttystate,
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serial_ttystate old_ttystate)
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{
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return 0;
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}
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static void
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e7000pc_print_tty_state (serial_t scb,
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serial_ttystate ttystate,
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struct ui_file *stream)
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{
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/* Nothing to print. */
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return;
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}
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static int
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e7000pc_setbaudrate (serial_t scb, int rate)
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{
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return 0;
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}
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static int
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e7000pc_setstopbits (serial_t scb, int rate)
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{
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return 0;
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}
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static int
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e7000pc_write (serial_t scb, const char *str, int len)
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{
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dosasync_write (scb->fd, str, len);
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return 0;
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}
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static void
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e7000pc_close (serial_t scb)
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{
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}
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static struct serial_ops e7000pc_ops =
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{
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"pc",
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0,
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e7000pc_open,
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e7000pc_close,
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e7000pc_readchar,
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e7000pc_write,
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e7000pc_noop, /* flush output */
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e7000pc_noop, /* flush input */
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e7000pc_noop, /* send break -- currently used only for nindy */
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e7000pc_raw,
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e7000pc_get_tty_state,
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e7000pc_set_tty_state,
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e7000pc_print_tty_state,
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e7000pc_noflush_set_tty_state,
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e7000pc_setbaudrate,
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e7000pc_setstopbits,
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e7000pc_noop, /* wait for output to drain */
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};
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void
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_initialize_ser_e7000pc (void)
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{
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serial_add_interface (&e7000pc_ops);
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}
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#else
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void
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_initialize_ser_e7000pc (void)
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{
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}
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#endif
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