Files
86Box/src/video/vid_oak_oti.c
2023-08-23 00:50:52 -04:00

699 lines
20 KiB
C

/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* Oak OTI037C/67/077 emulation.
*
*
*
* Authors: Sarah Walker, <https://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
*
* Copyright 2008-2018 Sarah Walker.
* Copyright 2016-2018 Miran Grca.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <86box/86box.h>
#include <86box/io.h>
#include <86box/timer.h>
#include <86box/mem.h>
#include <86box/rom.h>
#include <86box/device.h>
#include <86box/video.h>
#include <86box/vid_svga.h>
#include <86box/vid_svga_render.h>
#include <86box/plat_unused.h>
#define BIOS_037C_PATH "roms/video/oti/bios.bin"
#define BIOS_067_AMA932J_PATH "roms/machines/ama932j/OTI067.BIN"
#define BIOS_067_M300_08_PATH "roms/machines/m30008/EVC_BIOS.ROM"
#define BIOS_067_M300_15_PATH "roms/machines/m30015/EVC_BIOS.ROM"
#define BIOS_077_PATH "roms/video/oti/oti077.vbi"
enum {
OTI_037C = 0,
OTI_067 = 2,
OTI_067_AMA932J = 3,
OTI_067_M300 = 4,
OTI_077 = 5
};
typedef struct {
svga_t svga;
rom_t bios_rom;
int index;
uint8_t regs[32];
uint8_t chip_id;
uint8_t pos;
uint8_t enable_register;
uint8_t dipswitch_val;
uint32_t vram_size;
uint32_t vram_mask;
} oti_t;
static video_timings_t timing_oti = { .type = VIDEO_ISA, .write_b = 6, .write_w = 8, .write_l = 16, .read_b = 6, .read_w = 8, .read_l = 16 };
static void
oti_out(uint16_t addr, uint8_t val, void *priv)
{
oti_t *oti = (oti_t *) priv;
svga_t *svga = &oti->svga;
uint8_t old;
uint8_t idx;
uint8_t enable;
if (!oti->chip_id && !(oti->enable_register & 1) && (addr != 0x3C3))
return;
if ((((addr & 0xFFF0) == 0x3D0 || (addr & 0xFFF0) == 0x3B0) && addr < 0x3de) && !(svga->miscout & 1))
addr ^= 0x60;
switch (addr) {
case 0x3C3:
if (!oti->chip_id) {
oti->enable_register = val & 1;
return;
}
svga_out(addr, val, svga);
return;
case 0x3c6:
case 0x3c7:
case 0x3c8:
case 0x3c9:
if (oti->chip_id == OTI_077)
sc1148x_ramdac_out(addr, 0, val, svga->ramdac, svga);
else
svga_out(addr, val, svga);
return;
case 0x3D4:
if (oti->chip_id)
svga->crtcreg = val & 0x3f;
else
svga->crtcreg = val; /* FIXME: The BIOS wants to set the test bit? */
return;
case 0x3D5:
if (oti->chip_id && (svga->crtcreg & 0x20))
return;
idx = svga->crtcreg;
if (!oti->chip_id)
idx &= 0x1f;
if ((idx < 7) && (svga->crtc[0x11] & 0x80))
return;
if ((idx == 7) && (svga->crtc[0x11] & 0x80))
val = (svga->crtc[7] & ~0x10) | (val & 0x10);
old = svga->crtc[idx];
svga->crtc[idx] = val;
if (old != val) {
if ((idx < 0x0e) || (idx > 0x10)) {
if (idx == 0x0c || idx == 0x0d) {
svga->fullchange = 3;
svga->ma_latch = ((svga->crtc[0xc] << 8) | svga->crtc[0xd]) + ((svga->crtc[8] & 0x60) >> 5);
} else {
svga->fullchange = changeframecount;
svga_recalctimings(svga);
}
}
}
break;
case 0x3DE:
if (oti->chip_id)
oti->index = val & 0x1f;
else
oti->index = val;
return;
case 0x3DF:
idx = oti->index;
if (!oti->chip_id)
idx &= 0x1f;
oti->regs[idx] = val;
switch (idx) {
case 0xD:
if (oti->chip_id == OTI_067) {
svga->vram_display_mask = (val & 0x0c) ? oti->vram_mask : 0x3ffff;
if (!(val & 0x80))
svga->vram_display_mask = 0x3ffff;
if ((val & 0x80) && oti->vram_size == 256)
mem_mapping_disable(&svga->mapping);
else
mem_mapping_enable(&svga->mapping);
} else if (oti->chip_id == OTI_077) {
svga->vram_display_mask = (val & 0x0c) ? oti->vram_mask : 0x3ffff;
switch ((val & 0xc0) >> 6) {
default:
case 0x00: /* 256 kB of memory */
enable = (oti->vram_size >= 256);
if (val & 0x0c)
svga->vram_display_mask = MIN(oti->vram_mask, 0x3ffff);
break;
case 0x01: /* 1 MB of memory */
case 0x03:
enable = (oti->vram_size >= 1024);
if (val & 0x0c)
svga->vram_display_mask = MIN(oti->vram_mask, 0xfffff);
break;
case 0x02: /* 512 kB of memory */
enable = (oti->vram_size >= 512);
if (val & 0x0c)
svga->vram_display_mask = MIN(oti->vram_mask, 0x7ffff);
break;
}
if (enable)
mem_mapping_enable(&svga->mapping);
else
mem_mapping_disable(&svga->mapping);
} else {
if (val & 0x80)
mem_mapping_disable(&svga->mapping);
else
mem_mapping_enable(&svga->mapping);
}
break;
case 0x11:
svga->read_bank = (val & 0xf) * 65536;
svga->write_bank = (val >> 4) * 65536;
break;
default:
break;
}
return;
default:
break;
}
svga_out(addr, val, svga);
}
static uint8_t
oti_in(uint16_t addr, void *priv)
{
oti_t *oti = (oti_t *) priv;
svga_t *svga = &oti->svga;
uint8_t idx;
uint8_t temp;
if (!oti->chip_id && !(oti->enable_register & 1) && (addr != 0x3C3))
return 0xff;
if ((((addr & 0xFFF0) == 0x3D0 || (addr & 0xFFF0) == 0x3B0) && addr < 0x3de) && !(svga->miscout & 1))
addr ^= 0x60;
switch (addr) {
case 0x3C2:
if ((svga->vgapal[0].r + svga->vgapal[0].g + svga->vgapal[0].b) >= 0x50)
temp = 0;
else
temp = 0x10;
break;
case 0x3C3:
if (oti->chip_id)
temp = svga_in(addr, svga);
else
temp = oti->enable_register;
break;
case 0x3c6:
case 0x3c7:
case 0x3c8:
case 0x3c9:
if (oti->chip_id == OTI_077)
return sc1148x_ramdac_in(addr, 0, svga->ramdac, svga);
return svga_in(addr, svga);
case 0x3CF:
return svga->gdcreg[svga->gdcaddr & 0xf];
case 0x3D4:
temp = svga->crtcreg;
break;
case 0x3D5:
if (oti->chip_id) {
if (svga->crtcreg & 0x20)
temp = 0xff;
else
temp = svga->crtc[svga->crtcreg];
} else
temp = svga->crtc[svga->crtcreg & 0x1f];
break;
case 0x3DA:
if (oti->chip_id) {
temp = svga_in(addr, svga);
break;
}
svga->attrff = 0;
/*The OTI-037C BIOS waits for bits 0 and 3 in 0x3da to go low, then reads 0x3da again
and expects the diagnostic bits to equal the current border colour. As I understand
it, the 0x3da active enable status does not include the border time, so this may be
an area where OTI-037C is not entirely VGA compatible.*/
svga->cgastat &= ~0x30;
/* copy color diagnostic info from the overscan color register */
switch (svga->attrregs[0x12] & 0x30) {
case 0x00: /* P0 and P2 */
if (svga->attrregs[0x11] & 0x01)
svga->cgastat |= 0x10;
if (svga->attrregs[0x11] & 0x04)
svga->cgastat |= 0x20;
break;
case 0x10: /* P4 and P5 */
if (svga->attrregs[0x11] & 0x10)
svga->cgastat |= 0x10;
if (svga->attrregs[0x11] & 0x20)
svga->cgastat |= 0x20;
break;
case 0x20: /* P1 and P3 */
if (svga->attrregs[0x11] & 0x02)
svga->cgastat |= 0x10;
if (svga->attrregs[0x11] & 0x08)
svga->cgastat |= 0x20;
break;
case 0x30: /* P6 and P7 */
if (svga->attrregs[0x11] & 0x40)
svga->cgastat |= 0x10;
if (svga->attrregs[0x11] & 0x80)
svga->cgastat |= 0x20;
break;
default:
break;
}
temp = svga->cgastat;
break;
case 0x3DE:
temp = oti->index;
if (oti->chip_id)
temp |= (oti->chip_id << 5);
break;
case 0x3DF:
idx = oti->index;
if (!oti->chip_id)
idx &= 0x1f;
if (idx == 0x10)
temp = oti->dipswitch_val;
else
temp = oti->regs[idx];
break;
default:
temp = svga_in(addr, svga);
break;
}
return temp;
}
static void
oti_pos_out(UNUSED(uint16_t addr), uint8_t val, void *priv)
{
oti_t *oti = (oti_t *) priv;
if ((val ^ oti->pos) & 8) {
if (val & 8)
io_sethandler(0x03c0, 32, oti_in, NULL, NULL,
oti_out, NULL, NULL, oti);
else
io_removehandler(0x03c0, 32, oti_in, NULL, NULL,
oti_out, NULL, NULL, oti);
}
oti->pos = val;
}
static uint8_t
oti_pos_in(UNUSED(uint16_t addr), void *priv)
{
const oti_t *oti = (oti_t *) priv;
return (oti->pos);
}
static float
oti_getclock(int clock)
{
float ret = 0.0;
switch (clock) {
default:
case 0:
ret = 25175000.0;
break;
case 1:
ret = 28322000.0;
break;
case 4:
ret = 14318000.0;
break;
case 5:
ret = 16257000.0;
break;
case 7:
ret = 35500000.0;
break;
}
return ret;
}
static void
oti_recalctimings(svga_t *svga)
{
const oti_t *oti = (oti_t *) svga->priv;
int clk_sel = ((svga->miscout >> 2) & 3) | ((oti->regs[0x0d] & 0x20) >> 3);
svga->clock = (cpuclock * (double) (1ULL << 32)) / oti_getclock(clk_sel);
if (oti->chip_id > 0) {
if (oti->regs[0x14] & 0x08)
svga->ma_latch |= 0x10000;
if (oti->regs[0x16] & 0x08)
svga->ma_latch |= 0x20000;
if (oti->regs[0x14] & 0x01)
svga->vtotal += 0x400;
if (oti->regs[0x14] & 0x02)
svga->dispend += 0x400;
if (oti->regs[0x14] & 0x04)
svga->vsyncstart += 0x400;
svga->interlace = oti->regs[0x14] & 0x80;
}
if ((oti->regs[0x0d] & 0x0c) && !(oti->regs[0x0d] & 0x10))
svga->rowoffset <<= 1;
if (svga->bpp == 16) {
svga->render = svga_render_16bpp_highres;
svga->hdisp >>= 1;
} else if (svga->bpp == 15) {
svga->render = svga_render_15bpp_highres;
svga->hdisp >>= 1;
}
}
static void *
oti_init(const device_t *info)
{
oti_t *oti = malloc(sizeof(oti_t));
const char *romfn = NULL;
memset(oti, 0x00, sizeof(oti_t));
oti->chip_id = info->local;
oti->dipswitch_val = 0x18;
switch (oti->chip_id) {
case OTI_037C:
romfn = BIOS_037C_PATH;
oti->vram_size = 256;
oti->regs[0] = 0x08; /* FIXME: The BIOS wants to read this at index 0? This index is undocumented. */
#if 0
io_sethandler(0x03c0, 32,
oti_in, NULL, NULL, oti_out, NULL, NULL, oti);
#endif
break;
case OTI_067_AMA932J:
romfn = BIOS_067_AMA932J_PATH;
oti->chip_id = 2;
oti->vram_size = device_get_config_int("memory");
oti->dipswitch_val |= 0x20;
oti->pos = 0x08; /* Tell the BIOS the I/O ports are already enabled to avoid a double I/O handler mess. */
io_sethandler(0x46e8, 1, oti_pos_in, NULL, NULL, oti_pos_out, NULL, NULL, oti);
break;
case OTI_067_M300:
if (rom_present(BIOS_067_M300_15_PATH))
romfn = BIOS_067_M300_15_PATH;
else
romfn = BIOS_067_M300_08_PATH;
oti->vram_size = device_get_config_int("memory");
oti->pos = 0x08; /* Tell the BIOS the I/O ports are already enabled to avoid a double I/O handler mess. */
io_sethandler(0x46e8, 1, oti_pos_in, NULL, NULL, oti_pos_out, NULL, NULL, oti);
break;
case OTI_067:
case OTI_077:
romfn = BIOS_077_PATH;
oti->vram_size = device_get_config_int("memory");
oti->pos = 0x08; /* Tell the BIOS the I/O ports are already enabled to avoid a double I/O handler mess. */
io_sethandler(0x46e8, 1, oti_pos_in, NULL, NULL, oti_pos_out, NULL, NULL, oti);
break;
default:
break;
}
if (romfn != NULL) {
rom_init(&oti->bios_rom, romfn,
0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
}
oti->vram_mask = (oti->vram_size << 10) - 1;
video_inform(VIDEO_FLAG_TYPE_SPECIAL, &timing_oti);
svga_init(info, &oti->svga, oti, oti->vram_size << 10,
oti_recalctimings, oti_in, oti_out, NULL, NULL);
if (oti->chip_id == OTI_077)
oti->svga.ramdac = device_add(&sc11487_ramdac_device); /*Actually a 82c487, probably a clone.*/
io_sethandler(0x03c0, 32,
oti_in, NULL, NULL, oti_out, NULL, NULL, oti);
oti->svga.miscout = 1;
oti->svga.packed_chain4 = 1;
return oti;
}
static void
oti_close(void *priv)
{
oti_t *oti = (oti_t *) priv;
svga_close(&oti->svga);
free(oti);
}
static void
oti_speed_changed(void *priv)
{
oti_t *oti = (oti_t *) priv;
svga_recalctimings(&oti->svga);
}
static void
oti_force_redraw(void *priv)
{
oti_t *oti = (oti_t *) priv;
oti->svga.fullchange = changeframecount;
}
static int
oti037c_available(void)
{
return (rom_present(BIOS_037C_PATH));
}
static int
oti067_ama932j_available(void)
{
return (rom_present(BIOS_067_AMA932J_PATH));
}
static int
oti067_077_available(void)
{
return (rom_present(BIOS_077_PATH));
}
static int
oti067_m300_available(void)
{
if (rom_present(BIOS_067_M300_15_PATH))
return (rom_present(BIOS_067_M300_15_PATH));
else
return (rom_present(BIOS_067_M300_08_PATH));
}
// clang-format off
static const device_config_t oti067_config[] = {
{
.name = "memory",
.description = "Memory size",
.type = CONFIG_SELECTION,
.default_int = 512,
.selection = {
{
.description = "256 kB",
.value = 256
},
{
.description = "512 kB",
.value = 512
},
{
.description = ""
}
}
},
{
.type = CONFIG_END
}
};
static const device_config_t oti067_ama932j_config[] = {
{
.name = "memory",
.description = "Memory size",
.type = CONFIG_SELECTION,
.default_int = 256,
.selection = {
{
.description = "256 kB",
.value = 256
},
{
.description = "512 kB",
.value = 512
},
{
.description = ""
}
}
},
{
.type = CONFIG_END
}
};
static const device_config_t oti077_config[] = {
{
.name = "memory",
.description = "Memory size",
.type = CONFIG_SELECTION,
.default_int = 1024,
.selection = {
{
.description = "256 kB",
.value = 256
},
{
.description = "512 kB",
.value = 512
},
{
.description = "1 MB",
.value = 1024
},
{
.description = ""
}
}
},
{
.type = CONFIG_END
}
};
// clang-format on
const device_t oti037c_device = {
.name = "Oak OTI-037C",
.internal_name = "oti037c",
.flags = DEVICE_ISA,
.local = 0,
.init = oti_init,
.close = oti_close,
.reset = NULL,
{ .available = oti037c_available },
.speed_changed = oti_speed_changed,
.force_redraw = oti_force_redraw,
.config = NULL
};
const device_t oti067_device = {
.name = "Oak OTI-067",
.internal_name = "oti067",
.flags = DEVICE_ISA,
.local = 2,
.init = oti_init,
.close = oti_close,
.reset = NULL,
{ .available = oti067_077_available },
.speed_changed = oti_speed_changed,
.force_redraw = oti_force_redraw,
.config = oti067_config
};
const device_t oti067_m300_device = {
.name = "Oak OTI-067 (Olivetti M300-08/15)",
.internal_name = "oti067_m300",
.flags = DEVICE_ISA,
.local = 4,
.init = oti_init,
.close = oti_close,
.reset = NULL,
{ .available = oti067_m300_available },
.speed_changed = oti_speed_changed,
.force_redraw = oti_force_redraw,
.config = oti067_config
};
const device_t oti067_ama932j_device = {
.name = "Oak OTI-067 (AMA-932J)",
.internal_name = "oti067_ama932j",
.flags = DEVICE_ISA,
.local = 3,
.init = oti_init,
.close = oti_close,
.reset = NULL,
{ .available = oti067_ama932j_available },
.speed_changed = oti_speed_changed,
.force_redraw = oti_force_redraw,
.config = oti067_ama932j_config
};
const device_t oti077_device = {
.name = "Oak OTI-077",
.internal_name = "oti077",
.flags = DEVICE_ISA,
.local = 5,
.init = oti_init,
.close = oti_close,
.reset = NULL,
{ .available = oti067_077_available },
.speed_changed = oti_speed_changed,
.force_redraw = oti_force_redraw,
.config = oti077_config
};