| /* 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 */ |