/*************************************************************************
* *
* $Id: n8vem.c 1995 2008-07-15 03:59:13Z hharte $ *
* *
* Copyright (c) 2007-2008 Howard M. Harte. *
* http://www.hartetec.com *
* *
* 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 HOWARD M. HARTE 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 Howard M. Harte shall *
* not be used in advertising or otherwise to promote the sale, use or *
* other dealings in this Software without prior written authorization *
* Howard M. Harte. *
* *
* SIMH Interface based on altairz80_hdsk.c, by Peter Schorn. *
* *
* Module Description: *
* N8VEM Single-Board Computer I/O module for SIMH. *
* http://groups.google.com/group/n8vem/web/n8vem-single-board-computer-home-page *
* *
* Environment: *
* User mode only *
* *
*************************************************************************/
/* #define DBG_MSG */
#include "altairz80_defs.h"
#if defined (_WIN32)
#include <windows.h>
#endif
#ifdef DBG_MSG
#define DBG_PRINT(args) printf args
#else
#define DBG_PRINT(args)
#endif
/* Debug flags */
#define ERROR_MSG (1 << 0)
#define PIO_MSG (1 << 1)
#define UART_MSG (1 << 2)
#define RTC_MSG (1 << 3)
#define MPCL_MSG (1 << 4)
#define ROM_MSG (1 << 5)
#define VERBOSE_MSG (1 << 7)
#define N8VEM_MAX_DRIVES 2
typedef struct {
PNP_INFO pnp; /* Plug and Play */
uint8 *ram;
uint8 *rom;
uint8 rom_attached;
uint8 uart_scr;
uint8 uart_lcr;
uint8 mpcl_ram;
uint8 mpcl_rom;
} N8VEM_INFO;
static N8VEM_INFO n8vem_info_data = { { 0x0, 0x8000, 0x60, 32 } };
static N8VEM_INFO *n8vem_info = &n8vem_info_data;
extern t_stat set_membase(UNIT *uptr, int32 val, char *cptr, void *desc);
extern t_stat show_membase(FILE *st, UNIT *uptr, int32 val, void *desc);
extern t_stat set_iobase(UNIT *uptr, int32 val, char *cptr, void *desc);
extern t_stat show_iobase(FILE *st, UNIT *uptr, int32 val, void *desc);
extern uint32 sim_map_resource(uint32 baseaddr, uint32 size, uint32 resource_type,
int32 (*routine)(const int32, const int32, const int32), uint8 unmap);
extern uint32 PCX;
extern REG *sim_PC;
extern int32 find_unit_index (UNIT *uptr);
static t_stat n8vem_reset(DEVICE *n8vem_dev);
static t_stat n8vem_boot(int32 unitno, DEVICE *dptr);
static t_stat n8vem_attach(UNIT *uptr, char *cptr);
static t_stat n8vem_detach(UNIT *uptr);
static uint8 N8VEM_Read(const uint32 Addr);
static uint8 N8VEM_Write(const uint32 Addr, uint8 cData);
static int32 n8vemdev(const int32 port, const int32 io, const int32 data);
static int32 n8vem_mem(const int32 port, const int32 io, const int32 data);
static int32 save_rom = 0x00; /* When set to 1, saves ROM back to file on disk at detach time */
static int32 save_ram = 0x00; /* When set to 1, saves RAM back to file on disk at detach time */
static int32 n8vem_pio1a = 0x00; /* 8255 PIO1A IN Port */
static int32 n8vem_pio1b = 0x00; /* 8255 PIO1B OUT Port */
static int32 n8vem_pio1c = 0x00; /* 8255 PIO1C IN Port */
static int32 n8vem_pio1ctrl = 0x00; /* 8255 PIO1 Control Port */
#define N8VEM_ROM_SIZE (1024 * 1024)
#define N8VEM_RAM_SIZE (512 * 1024)
#define N8VEM_RAM_SELECT (1 << 7)
#define N8VEM_RAM_MASK 0x0F
#define N8VEM_ROM_MASK 0x1F
#define N8VEM_ADDR_MASK 0x7FFF
static UNIT n8vem_unit[] = {
{ UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, N8VEM_ROM_SIZE) },
{ UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, N8VEM_RAM_SIZE) }
};
static REG n8vem_reg[] = {
{ HRDATA (SAVEROM, save_rom, 1), },
{ HRDATA (SAVERAM, save_ram, 1), },
{ HRDATA (PIO1A, n8vem_pio1a, 8), },
{ HRDATA (PIO1B, n8vem_pio1b, 8), },
{ HRDATA (PIO1C, n8vem_pio1c, 8), },
{ HRDATA (PIO1CTRL, n8vem_pio1ctrl, 8), },
{ NULL }
};
static MTAB n8vem_mod[] = {
{ MTAB_XTD|MTAB_VDV, 0, "MEMBASE", "MEMBASE", &set_membase, &show_membase, NULL },
{ MTAB_XTD|MTAB_VDV, 0, "IOBASE", "IOBASE", &set_iobase, &show_iobase, NULL },
{ 0 }
};
/* Debug Flags */
static DEBTAB n8vem_dt[] = {
{ "ERROR", ERROR_MSG },
{ "PIO", PIO_MSG },
{ "UART", UART_MSG },
{ "RTC", RTC_MSG },
{ "ROM", ROM_MSG },
{ "VERBOSE",VERBOSE_MSG },
{ NULL, 0 }
};
DEVICE n8vem_dev = {
"N8VEM", n8vem_unit, n8vem_reg, n8vem_mod,
N8VEM_MAX_DRIVES, 10, 31, 1, N8VEM_MAX_DRIVES, N8VEM_MAX_DRIVES,
NULL, NULL, &n8vem_reset,
&n8vem_boot, &n8vem_attach, &n8vem_detach,
&n8vem_info_data, (DEV_DISABLE | DEV_DIS | DEV_DEBUG), ERROR_MSG,
n8vem_dt, NULL, "Single-Board Computer N8VEM"
};
/* Reset routine */
static t_stat n8vem_reset(DEVICE *dptr)
{
PNP_INFO *pnp = (PNP_INFO *)dptr->ctxt;
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: Reset.\n");
if(dptr->flags & DEV_DIS) { /* Disconnect I/O Ports */
sim_map_resource(pnp->io_base, pnp->io_size, RESOURCE_TYPE_IO, &n8vemdev, TRUE);
sim_map_resource(pnp->mem_base, pnp->mem_size, RESOURCE_TYPE_MEMORY, &n8vem_mem, TRUE);
free(n8vem_info->ram);
free(n8vem_info->rom);
} else {
/* Connect N8VEM at base address */
if(sim_map_resource(pnp->io_base, pnp->io_size, RESOURCE_TYPE_IO, &n8vemdev, FALSE) != 0) {
printf("%s: error mapping I/O resource at 0x%04x\n", __FUNCTION__, pnp->io_base);
return SCPE_ARG;
}
/* Connect N8VEM Memory (512K RAM, 1MB FLASH) */
if(sim_map_resource(pnp->mem_base, pnp->mem_size, RESOURCE_TYPE_MEMORY, &n8vem_mem, FALSE) != 0) {
printf("%s: error mapping MEM resource at 0x%04x\n", __FUNCTION__, pnp->mem_base);
return SCPE_ARG;
}
n8vem_info->ram = calloc(1, (N8VEM_RAM_SIZE));
n8vem_info->rom = calloc(1, (N8VEM_ROM_SIZE));
/* Clear the RAM and ROM mapping registers */
n8vem_info->mpcl_ram = 0;
n8vem_info->mpcl_rom = 0;
}
return SCPE_OK;
}
static t_stat n8vem_boot(int32 unitno, DEVICE *dptr)
{
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: Boot.\n");
/* Clear the RAM and ROM mapping registers */
n8vem_info->mpcl_ram = 0;
n8vem_info->mpcl_rom = 0;
/* Set the PC to 0, and go. */
*((int32 *) sim_PC->loc) = 0;
return SCPE_OK;
}
/* Attach routine */
static t_stat n8vem_attach(UNIT *uptr, char *cptr)
{
t_stat r;
int32 i = 0, rtn;
i = find_unit_index(uptr);
if (i == -1) {
return (SCPE_IERR);
}
r = attach_unit(uptr, cptr); /* attach unit */
if ( r != SCPE_OK) /* error? */
return r;
/* Determine length of this disk */
uptr->capac = sim_fsize(uptr->fileref);
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: Attach %s.\n", i == 0 ? "ROM" : "RAM");
if(i == 0) { /* Attaching ROM */
n8vem_info->rom_attached = TRUE;
/* Erase ROM */
memset(n8vem_info->rom, 0xFF, N8VEM_ROM_SIZE);
if(uptr->capac > 0) {
/* Only read in enough of the file to fill the ROM. */
if (uptr->capac > N8VEM_ROM_SIZE)
uptr->capac = N8VEM_ROM_SIZE;
rtn = fread((void *)(n8vem_info->rom), uptr->capac, 1, uptr->fileref);
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: Reading %d bytes into ROM." " Result = %ssuccessful.\n", uptr->capac, rtn == 1 ? "" : "not ");
}
} else { /* attaching RAM */
/* Erase RAM */
memset(n8vem_info->ram, 0x00, N8VEM_RAM_SIZE);
if(uptr->capac > 0) {
/* Only read in enough of the file to fill the RAM. */
if(uptr->capac > N8VEM_RAM_SIZE)
uptr->capac = N8VEM_RAM_SIZE;
rtn = fread((void *)(n8vem_info->ram), uptr->capac, 1, uptr->fileref);
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: Reading %d bytes into RAM." " Result = %ssuccessful.\n", uptr->capac, rtn == 1 ? "" : "not ");
}
}
return r;
}
/* Detach routine */
static t_stat n8vem_detach(UNIT *uptr)
{
t_stat r;
int32 i = 0;
i = find_unit_index(uptr);
if (i == -1) {
return (SCPE_IERR);
}
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: Detach %s.\n", i == 0 ? "ROM" : "RAM");
/* rewind to the beginning of the file. */
sim_fseek(uptr->fileref, 0, SEEK_SET);
if(i == 0) { /* ROM */
/* Save the ROM back to disk if SAVEROM is set. */
if(save_rom == 1) {
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: Writing %d bytes into ROM image.\n", N8VEM_ROM_SIZE);
fwrite((void *)(n8vem_info->rom), N8VEM_ROM_SIZE, 1, uptr->fileref);
}
} else { /* RAM */
/* Save the RAM back to disk if SAVERAM is set. */
if(save_ram == 1) {
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: Writing %d bytes into RAM image.\n", N8VEM_RAM_SIZE);
fwrite((void *)(n8vem_info->ram), N8VEM_RAM_SIZE, 1, uptr->fileref);
}
}
r = detach_unit(uptr); /* detach unit */
return r;
}
/* RAM MEMORY PAGE CONFIGURATION LATCH CONTROL PORT ( IO_Y3 ) INFORMATION
*
* 7 6 5 4 3 2 1 0 ONLY APPLICABLE TO THE LOWER MEMORY PAGE $0000-$7FFF
* ^ ^ ^ ^ ^ ^ ^ ^
* : : : : : : : :--0 = A15 RAM ADDRESS LINE DEFAULT IS 0
* : : : : : : :----0 = A16 RAM ADDRESS LINE DEFAULT IS 0
* : : : : : :------0 = A17 RAM ADDRESS LINE DEFAULT IS 0
* : : : : :--------0 = A18 RAM ADDRESS LINE DEFAULT IS 0
* : : : :-----------0 =
* : : :-------------0 =
* : :---------------0 =
* :-----------------0 =
*
* ROM MEMORY PAGE CONFIGURATION LATCH CONTROL PORT ( IO_Y3+$04 ) INFORMATION
*
* 7 6 5 4 3 2 1 0 ONLY APPLICABLE TO THE LOWER MEMORY PAGE $0000-$7FFF
* ^ ^ ^ ^ ^ ^ ^ ^
* : : : : : : : :--0 = A15 ROM ADDRESS LINE DEFAULT IS 0
* : : : : : : :----0 = A16 ROM ADDRESS LINE DEFAULT IS 0
* : : : : : :------0 = A17 ROM ADDRESS LINE DEFAULT IS 0
* : : : : :--------0 = A18 ROM ADDRESS LINE DEFAULT IS 0
* : : : :-----------0 = A19 ROM ONLY ADDRESS LINE DEFAULT IS 0
* : : :-------------0 =
* : :---------------0 =
* :-----------------0 = ROM SELECT (0=ROM, 1=RAM) DEFAULT IS 0
*/
static int32 n8vem_mem(const int32 Addr, const int32 write, const int32 data)
{
/* DBG_PRINT(("N8VEM: ROM %s, Addr %04x" NLP, write ? "WR" : "RD", Addr)); */
if(write) {
if(n8vem_info->mpcl_rom & N8VEM_RAM_SELECT)
{
n8vem_info->ram[((n8vem_info->mpcl_ram & N8VEM_RAM_MASK) << 15) | (Addr & N8VEM_ADDR_MASK)] = data;
} else {
if(save_rom == 1) {
n8vem_info->rom[((n8vem_info->mpcl_rom & N8VEM_ROM_MASK) << 15) | (Addr & N8VEM_ADDR_MASK)] = data;
} else {
sim_debug(ROM_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR ROM[0x%05x]: Cannot write to ROM.\n", PCX, ((n8vem_info->mpcl_rom & N8VEM_ROM_MASK) << 15) | (Addr & N8VEM_ADDR_MASK));
}
}
return 0;
} else {
if(n8vem_info->mpcl_rom & N8VEM_RAM_SELECT)
{
return n8vem_info->ram[((n8vem_info->mpcl_ram & N8VEM_RAM_MASK) << 15) | (Addr & N8VEM_ADDR_MASK)];
} else {
return n8vem_info->rom[((n8vem_info->mpcl_rom & N8VEM_ROM_MASK) << 15) | (Addr & N8VEM_ADDR_MASK)];
}
}
}
static int32 n8vemdev(const int32 port, const int32 io, const int32 data)
{
/* DBG_PRINT(("N8VEM: IO %s, Port %02x\n", io ? "WR" : "RD", port)); */
if(io) {
N8VEM_Write(port, data);
return 0;
} else {
return(N8VEM_Read(port));
}
}
#define N8VEM_PIO1A 0x00 /* (INPUT) IN 1-8 */
#define N8VEM_PIO1B 0x01 /* (OUTPUT) OUT TO LEDS */
#define N8VEM_PIO1C 0x02 /* (INPUT) */
#define N8VEM_PIO1CONT 0x03 /* CONTROL BYTE PIO 82C55 */
#define N8VEM_UART_DATA 0x08
#define N8VEM_UART_RSR 0x09
#define N8VEM_UART_INTR 0x0A
#define N8VEM_UART_LCR 0x0B
#define N8VEM_UART_MCR 0x0C
#define N8VEM_UART_LSR 0x0D
#define N8VEM_UART_MSR 0x0E
#define N8VEM_UART_SCR 0x0F
#define N8VEM_MPCL_RAM 0x18 /* RAM Address control port */
#define N8VEM_MPCL_RAM1 0x19 /* RAM Address control port */
#define N8VEM_MPCL_RAM2 0x1A /* RAM Address control port */
#define N8VEM_MPCL_RAM3 0x1B /* RAM Address control port */
#define N8VEM_MPCL_ROM 0x1C /* ROM Address control port */
#define N8VEM_MPCL_ROM1 0x1D /* ROM Address control port */
#define N8VEM_MPCL_ROM2 0x1E /* ROM Address control port */
#define N8VEM_MPCL_ROM3 0x1F /* ROM Address control port */
extern int32 sio0d(const int32 port, const int32 io, const int32 data);
extern int32 sio0s(const int32 port, const int32 io, const int32 data);
static uint8 N8VEM_Read(const uint32 Addr)
{
uint8 cData = 0xFF;
switch(Addr & 0x1F) {
case N8VEM_PIO1A:
sim_debug(PIO_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " RD: PIO1A\n", PCX);
cData = n8vem_pio1a;
break;
case N8VEM_PIO1B:
sim_debug(PIO_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " RD: PIO1B\n", PCX);
cData = n8vem_pio1b;
break;
case N8VEM_PIO1C:
sim_debug(PIO_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " RD: PIO1C\n", PCX);
cData = n8vem_pio1c;
break;
case N8VEM_PIO1CONT:
sim_debug(PIO_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " RD: PIO1CTRL\n", PCX);
cData = n8vem_pio1ctrl;
break;
case N8VEM_UART_LCR:
cData = n8vem_info->uart_lcr;
break;
case N8VEM_UART_DATA:
case N8VEM_UART_RSR:
case N8VEM_UART_LSR:
case N8VEM_UART_INTR:
case N8VEM_UART_MCR:
case N8VEM_UART_MSR:
sim_debug(UART_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " RD[%02x]: UART not Implemented.\n", PCX, Addr);
break;
case N8VEM_UART_SCR: /* 16550 Scratchpad, implemented so software can detect UART is present */
cData = n8vem_info->uart_scr;
break;
case N8VEM_MPCL_RAM:
case N8VEM_MPCL_RAM1:
case N8VEM_MPCL_RAM2:
case N8VEM_MPCL_RAM3:
sim_debug(MPCL_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " RD: MPCL_RAM not Implemented.\n", PCX);
break;
case N8VEM_MPCL_ROM:
case N8VEM_MPCL_ROM1:
case N8VEM_MPCL_ROM2:
case N8VEM_MPCL_ROM3:
sim_debug(MPCL_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " RD: MPCL_ROM not Implemented.\n", PCX);
break;
default:
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " RD[%02x]: not Implemented.\n", PCX, Addr);
break;
}
return (cData);
}
static uint8 N8VEM_Write(const uint32 Addr, uint8 cData)
{
switch(Addr & 0x1F) {
case N8VEM_PIO1A:
sim_debug(PIO_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR: PIO1A=0x%02x\n", PCX, cData);
n8vem_pio1a = cData;
break;
case N8VEM_PIO1B:
sim_debug(PIO_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR: PIO1B=0x%02x\n", PCX, cData);
n8vem_pio1b = cData;
break;
case N8VEM_PIO1C:
sim_debug(PIO_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR: PIO1C=0x%02x\n", PCX, cData);
n8vem_pio1c = cData;
break;
case N8VEM_PIO1CONT:
sim_debug(PIO_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR: PIO1_CTRL=0x%02x\n", PCX, cData);
n8vem_pio1ctrl = cData;
break;
case N8VEM_UART_LCR:
sim_debug(UART_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR: UART LCR=%02x.\n", PCX, cData);
n8vem_info->uart_lcr = cData;
break;
case N8VEM_UART_DATA:
case N8VEM_UART_RSR:
case N8VEM_UART_INTR:
case N8VEM_UART_MCR:
case N8VEM_UART_LSR:
case N8VEM_UART_MSR:
sim_debug(UART_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR[%02x]: UART not Implemented.\n", PCX, Addr);
break;
case N8VEM_UART_SCR: /* 16550 Scratchpad, implemented so software can detect UART is present */
n8vem_info->uart_scr = cData;
break;
case N8VEM_MPCL_RAM:
case N8VEM_MPCL_RAM1:
case N8VEM_MPCL_RAM2:
case N8VEM_MPCL_RAM3:
sim_debug(MPCL_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR: MPCL_RAM=0x%02x\n", PCX, cData);
n8vem_info->mpcl_ram = cData;
break;
case N8VEM_MPCL_ROM:
case N8VEM_MPCL_ROM1:
case N8VEM_MPCL_ROM2:
case N8VEM_MPCL_ROM3:
sim_debug(MPCL_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR: MPCL_ROM=0x%02x\n", PCX, cData);
n8vem_info->mpcl_rom = cData;
break;
default:
sim_debug(VERBOSE_MSG, &n8vem_dev, "N8VEM: " ADDRESS_FORMAT " WR[0x%02x]=0x%02x: not Implemented.\n", PCX, Addr, cData);
break;
}
return(0);
}