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SWTP6800: Added support to initialize the BOOTROM with the contents of the swtbug.bin ROM image while retaining the ability to load any other ROM image.

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This commit is contained in:
Mark Pizzolato 2015-04-05 18:40:35 -07:00
parent 50bac79cd3
commit d4720d3540
1 changed files with 35 additions and 3 deletions
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38
swtp6800/common/bootrom.c
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@ -42,6 +42,11 @@
#include <stdio.h>
#include "swtp_defs.h"
#if !defined(DONT_USE_INTERNAL_ROM)
#include "swtp_swtbug_bin.h"
#endif /* DONT_USE_INTERNAL_ROM */
#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 */
@ -61,8 +66,12 @@ 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),
UNIT BOOTROM_unit = {
#if defined(DONT_USE_INTERNAL_ROM)
UDATA (NULL, UNIT_ATTABLE+UNIT_BINK+UNIT_ROABLE+UNIT_RO, 0),
#else /* !defined(DONT_USE_INTERNAL_ROM) */
UDATA (NULL, UNIT_ATTABLE+UNIT_BINK+UNIT_ROABLE+UNIT_RO+((BOOT_CODE_SIZE>>9)<<UNIT_V_MSIZE), BOOT_CODE_SIZE),
#endif
KBD_POLL_WAIT };
MTAB BOOTROM_mod[] = {
@ -117,6 +126,8 @@ DEVICE BOOTROM_dev = {
t_stat BOOTROM_attach (UNIT *uptr, char *cptr)
{
t_stat r;
t_addr image_size, capac;
int i;
if (BOOTROM_dev.dctrl & DEBUG_flow)
printf("BOOTROM_attach: cptr=%s\n", cptr);
@ -125,6 +136,14 @@ t_stat BOOTROM_attach (UNIT *uptr, char *cptr)
printf("BOOTROM_attach: Error\n");
return r;
}
image_size = (t_addr)sim_fsize_ex (BOOTROM_unit.fileref);
for (capac = 0x200, i=1; capac < image_size; capac <<= 1, i++);
if (i > (UNIT_2764>>UNIT_V_MSIZE)) {
detach_unit (uptr);
return SCPE_ARG;
}
uptr->flags &= ~UNIT_MSIZE;
uptr->flags |= (i << UNIT_V_MSIZE);
if (BOOTROM_dev.dctrl & DEBUG_flow)
printf("BOOTROM_attach: Done\n");
return (BOOTROM_reset (NULL));
@ -179,13 +198,21 @@ t_stat BOOTROM_reset (DEVICE *dptr)
// 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 */
BOOTROM_unit.filebuf = calloc(1, 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;
}
}
#if !defined(DONT_USE_INTERNAL_ROM)
if (!BOOTROM_unit.filename) {
if (BOOTROM_unit.capac < BOOT_CODE_SIZE)
return SCPE_ARG;
memcpy (BOOTROM_unit.filebuf, BOOT_CODE_ARRAY, BOOT_CODE_SIZE);
return SCPE_OK;
}
#endif
fp = fopen(BOOTROM_unit.filename, "rb"); /* open EPROM file */
if (fp == NULL) {
printf("\tUnable to open ROM file %s\n",BOOTROM_unit.filename);
@ -222,6 +249,11 @@ int32 BOOTROM_get_mbyte(int32 offset)
}
if (BOOTROM_dev.dctrl & DEBUG_read)
printf("BOOTROM_get_mbyte: offset=%04X\n", offset);
if ((t_addr)offset > BOOTROM_unit.capac) {
if (BOOTROM_dev.dctrl & DEBUG_read)
printf("BOOTROM_get_mbyte: EPROM reference beyond ROM size\n");
return 0xFF;
}
val = *((uint8 *)(BOOTROM_unit.filebuf) + offset) & 0xFF;
if (BOOTROM_dev.dctrl & DEBUG_read)
printf("BOOTROM_get_mbyte: Normal val=%02X\n", val);