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/* bootrom.c: Boot ROM simulator for Motorola processors
Copyright (c) 2010-2011, William A. Beech
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of William A. Beech shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from William A. Beech.
These functions support a single simulated 2704 to 2764 EPROM device on
an 8-bit computer system.. This device allows the the device buffer to
be loaded from a binary file containing the emulated EPROM code.
These functions support a simulated 2704, 2708, 2716, 2732 or 2764 EPROM
device on a CPU board. The byte get and put routines use an offset into
the boot EPROM image to locate the proper byte. This allows another device
to set the base address for the boot EPROM. The device type is stored as
a binary number in the first three unit flag bits.
This device uses a dynamically allocated buffer to hold the EPROM image.
A call to BOOTROM_config will free the current buffer. A call to
BOOTROM_reset will allocate a new buffer of BOOTROM_unit.capac bytes. A
call to BOOTROM_attach will load the buffer with the EPROM image.
*/
#include <stdio.h>
#include "swtp_defs.h"
#define UNIT_V_MSIZE (UNIT_V_UF) /* ROM Size */
#define UNIT_MSIZE (0x7 << UNIT_V_MSIZE)
#define UNIT_NONE (0 << UNIT_V_MSIZE) /* No EPROM */
#define UNIT_2704 (1 << UNIT_V_MSIZE) /* 2704 mode */
#define UNIT_2708 (2 << UNIT_V_MSIZE) /* 2708 mode */
#define UNIT_2716 (3 << UNIT_V_MSIZE) /* 2716 mode */
#define UNIT_2732 (4 << UNIT_V_MSIZE) /* 2732 mode */
#define UNIT_2764 (5 << UNIT_V_MSIZE) /* 2764 mode */
/* function prototypes */
t_stat BOOTROM_svc (UNIT *uptr);
t_stat BOOTROM_config (UNIT *uptr, int32 val, char *cptr, void *desc);
t_stat BOOTROM_attach (UNIT *uptr, char *cptr);
t_stat BOOTROM_reset (DEVICE *dptr);
int32 BOOTROM_get_mbyte(int32 offset);
/* SIMH Standard I/O Data Structures */
UNIT BOOTROM_unit = { UDATA (NULL,
UNIT_ATTABLE+UNIT_BINK+UNIT_ROABLE+UNIT_RO, 0),
KBD_POLL_WAIT };
MTAB BOOTROM_mod[] = {
{ UNIT_MSIZE, UNIT_NONE, "None", "NONE", &BOOTROM_config },
{ UNIT_MSIZE, UNIT_2704, "2704", "2704", &BOOTROM_config },
{ UNIT_MSIZE, UNIT_2708, "2708", "2708", &BOOTROM_config },
{ UNIT_MSIZE, UNIT_2716, "2716", "2716", &BOOTROM_config },
{ UNIT_MSIZE, UNIT_2732, "2732", "2732", &BOOTROM_config },
{ UNIT_MSIZE, UNIT_2764, "2764", "2764", &BOOTROM_config },
{ 0 }
};
DEBTAB BOOTROM_debug[] = {
{ "ALL", DEBUG_all },
{ "FLOW", DEBUG_flow },
{ "READ", DEBUG_read },
{ "WRITE", DEBUG_write },
{ "LEV1", DEBUG_level1 },
{ "LEV2", DEBUG_level2 },
{ NULL }
};
DEVICE BOOTROM_dev = {
"BOOTROM", /* name */
&BOOTROM_unit, /* units */
NULL, /* registers */
BOOTROM_mod, /* modifiers */
1, /* numunits */
16, /* aradix */
32, /* awidth */
1, /* aincr */
16, /* dradix */
8, /* dwidth */
NULL, /* examine */
NULL, /* deposit */
&BOOTROM_reset, /* reset */
NULL, /* boot */
&BOOTROM_attach, /* attach */
NULL, /* detach */
NULL, /* ctxt */
DEV_DEBUG, /* flags */
0, /* dctrl */
BOOTROM_debug, /* debflags */
NULL, /* msize */
NULL /* lname */
};
/* global variables */
/* BOOTROM_attach - attach file to EPROM unit */
t_stat BOOTROM_attach (UNIT *uptr, char *cptr)
{
t_stat r;
if (BOOTROM_dev.dctrl & DEBUG_flow)
printf("BOOTROM_attach: cptr=%s\n", cptr);
if ((r = attach_unit (uptr, cptr)) != SCPE_OK) {
if (BOOTROM_dev.dctrl & DEBUG_flow)
printf("BOOTROM_attach: Error\n");
return r;
}
if (BOOTROM_dev.dctrl & DEBUG_flow)
printf("BOOTROM_attach: Done\n");
return (BOOTROM_reset (NULL));
}
/* BOOTROM_config = None, 2704, 2708, 2716, 2732 or 2764 */
t_stat BOOTROM_config (UNIT *uptr, int32 val, char *cptr, void *desc)
{
if (BOOTROM_dev.dctrl & DEBUG_flow) /* entry message */
printf("BOOTROM_config: val=%d\n", val);
if ((val < UNIT_NONE) || (val > UNIT_2764)) { /* valid param? */
if (BOOTROM_dev.dctrl & DEBUG_flow) /* No */
printf("BOOTROM_config: Parameter error\n");
return SCPE_ARG;
}
if (val == UNIT_NONE)
BOOTROM_unit.capac = 0; /* set EPROM size */
else
BOOTROM_unit.capac = 0x200 << ((val >> UNIT_V_MSIZE) - 1); /* set EPROM size */
if (BOOTROM_unit.filebuf) { /* free buffer */
free (BOOTROM_unit.filebuf);
BOOTROM_unit.filebuf = NULL;
}
if (BOOTROM_dev.dctrl & DEBUG_flow) /* status message */
printf("BOOTROM_config: BOOTROM_unit.capac=%d\n",
BOOTROM_unit.capac);
if (BOOTROM_dev.dctrl & DEBUG_flow) /* exit message */
printf("BOOTROM_config: Done\n");
return SCPE_OK;
}
/* EPROM reset */
t_stat BOOTROM_reset (DEVICE *dptr)
{
t_addr j;
int c;
FILE *fp;
if (BOOTROM_dev.dctrl & DEBUG_flow)
printf("BOOTROM_reset: \n");
if ((BOOTROM_unit.flags & UNIT_MSIZE) == 0) { /* if none selected */
// printf(" EPROM: Defaulted to None\n");
// printf(" \"set eprom NONE | 2704 | 2708 | 2716 | 2732 | 2764\"\n");
// printf(" \"att eprom <filename>\"\n");
BOOTROM_unit.capac = 0; /* set EPROM size to 0 */
if (BOOTROM_dev.dctrl & DEBUG_flow)
printf("BOOTROM_reset: Done1\n");
return SCPE_OK;
} /* if attached */
// printf(" EPROM: Initializing [%04X-%04XH]\n",
// 0xE000, 0xE000 + BOOTROM_unit.capac - 1);
if (BOOTROM_unit.filebuf == NULL) { /* no buffer allocated */
BOOTROM_unit.filebuf = malloc(BOOTROM_unit.capac); /* allocate EPROM buffer */
if (BOOTROM_unit.filebuf == NULL) {
if (BOOTROM_dev.dctrl & DEBUG_flow)
printf("BOOTROM_reset: Malloc error\n");
return SCPE_MEM;
}
}
fp = fopen(BOOTROM_unit.filename, "rb"); /* open EPROM file */
if (fp == NULL) {
printf("\tUnable to open ROM file %s\n",BOOTROM_unit.filename);
printf("\tNo ROM image loaded!!!\n");
return SCPE_OK;
}
j = 0; /* load EPROM file */
c = fgetc(fp);
while (c != EOF) {
*((uint8 *)(BOOTROM_unit.filebuf) + j++) = c & 0xFF;
c = fgetc(fp);
if (j > BOOTROM_unit.capac) {
printf("\tImage is too large - Load truncated!!!\n");
break;
}
}
fclose(fp);
// printf("\t%d bytes of ROM image %s loaded\n", j, BOOTROM_unit.filename);
if (BOOTROM_dev.dctrl & DEBUG_flow)
printf("BOOTROM_reset: Done2\n");
return SCPE_OK;
}
/* get a byte from memory - byte offset of image */
int32 BOOTROM_get_mbyte(int32 offset)
{
int32 val;
if (BOOTROM_unit.filebuf == NULL) {
if (BOOTROM_dev.dctrl & DEBUG_read)
printf("BOOTROM_get_mbyte: EPROM not configured\n");
return 0xFF;
}
if (BOOTROM_dev.dctrl & DEBUG_read)
printf("BOOTROM_get_mbyte: offset=%04X\n", offset);
val = *((uint8 *)(BOOTROM_unit.filebuf) + offset) & 0xFF;
if (BOOTROM_dev.dctrl & DEBUG_read)
printf("BOOTROM_get_mbyte: Normal val=%02X\n", val);
return val;
}
/* end of bootrom.c */