591 lines
12 KiB
C
591 lines
12 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Oak OTI037C/67/077 emulation.
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*
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*
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*
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* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
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* Miran Grca, <mgrca8@gmail.com>
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*
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* Copyright 2008-2018 Sarah Walker.
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* Copyright 2016-2018 Miran Grca.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include <86box/86box.h>
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#include <86box/io.h>
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#include <86box/timer.h>
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#include <86box/mem.h>
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#include <86box/rom.h>
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#include <86box/device.h>
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#include <86box/video.h>
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#include <86box/vid_svga.h>
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#define BIOS_037C_PATH L"roms/video/oti/bios.bin"
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#define BIOS_067_AMA932J_PATH L"roms/machines/ama932j/oti067.bin"
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#define BIOS_067_M300_08_PATH L"roms/machines/olivetti_m300_08/EVC_BIOS.ROM"
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#define BIOS_067_M300_15_PATH L"roms/machines/olivetti_m300_15/EVC_BIOS.ROM"
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#define BIOS_077_PATH L"roms/video/oti/oti077.vbi"
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enum {
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OTI_037C,
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OTI_067 = 2,
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OTI_067_AMA932J,
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OTI_067_M300 = 4,
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OTI_077 = 5
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};
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typedef struct {
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svga_t svga;
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rom_t bios_rom;
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int index;
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uint8_t regs[32];
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uint8_t chip_id;
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uint8_t pos;
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uint8_t enable_register;
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uint8_t dipswitch_val;
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uint32_t vram_size;
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uint32_t vram_mask;
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} oti_t;
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static video_timings_t timing_oti = {VIDEO_ISA, 6, 8,16, 6, 8,16};
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static void
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oti_out(uint16_t addr, uint8_t val, void *p)
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{
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oti_t *oti = (oti_t *)p;
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svga_t *svga = &oti->svga;
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uint8_t old;
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uint8_t idx, enable;
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if (!oti->chip_id && !(oti->enable_register & 1) && (addr != 0x3C3))
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return;
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if ((((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && addr < 0x3de) &&
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!(svga->miscout & 1)) addr ^= 0x60;
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switch (addr) {
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case 0x3C3:
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if (!oti->chip_id) {
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oti->enable_register = val & 1;
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return;
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} else
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break;
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case 0x3D4:
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if (oti->chip_id)
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svga->crtcreg = val & 0x3f;
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else
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svga->crtcreg = val; /* FIXME: The BIOS wants to set the test bit? */
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return;
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case 0x3D5:
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if (oti->chip_id && (svga->crtcreg & 0x20))
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return;
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idx = svga->crtcreg;
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if (!oti->chip_id)
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idx &= 0x1f;
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if ((idx < 7) && (svga->crtc[0x11] & 0x80))
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return;
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if ((idx == 7) && (svga->crtc[0x11] & 0x80))
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val = (svga->crtc[7] & ~0x10) | (val & 0x10);
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old = svga->crtc[idx];
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svga->crtc[idx] = val;
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if (old != val) {
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if ((idx < 0x0e) || (idx > 0x10)) {
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svga->fullchange = changeframecount;
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svga_recalctimings(svga);
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}
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}
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break;
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case 0x3DE:
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if (oti->chip_id)
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oti->index = val & 0x1f;
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else
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oti->index = val;
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return;
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case 0x3DF:
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idx = oti->index;
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if (!oti->chip_id)
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idx &= 0x1f;
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oti->regs[idx] = val;
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switch (idx) {
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case 0xD:
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if (oti->chip_id == OTI_067) {
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svga->vram_display_mask = (val & 0xc) ? oti->vram_mask : 0x3ffff;
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if (!(val & 0x80))
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svga->vram_display_mask = 0x3ffff;
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if ((val & 0x80) && oti->vram_size == 256)
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mem_mapping_disable(&svga->mapping);
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else
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mem_mapping_enable(&svga->mapping);
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} else if (oti->chip_id == OTI_077) {
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svga->vram_display_mask = (val & 0xc) ? oti->vram_mask : 0x3ffff;
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switch ((val & 0xc0) >> 6) {
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case 0x00: /* 256 kB of memory */
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default:
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enable = (oti->vram_size >= 256);
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if (val & 0xc)
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svga->vram_display_mask = MIN(oti->vram_mask, 0x3ffff);
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break;
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case 0x01: /* 1 MB of memory */
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case 0x03:
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enable = (oti->vram_size >= 1024);
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if (val & 0xc)
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svga->vram_display_mask = MIN(oti->vram_mask, 0xfffff);
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break;
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case 0x02: /* 512 kB of memory */
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enable = (oti->vram_size >= 512);
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if (val & 0xc)
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svga->vram_display_mask = MIN(oti->vram_mask, 0x7ffff);
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break;
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}
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if (enable)
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mem_mapping_enable(&svga->mapping);
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else
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mem_mapping_disable(&svga->mapping);
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} else {
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if (val & 0x80)
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mem_mapping_disable(&svga->mapping);
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else
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mem_mapping_enable(&svga->mapping);
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}
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break;
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case 0x11:
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svga->read_bank = (val & 0xf) * 65536;
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svga->write_bank = (val >> 4) * 65536;
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break;
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}
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return;
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}
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svga_out(addr, val, svga);
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}
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static uint8_t
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oti_in(uint16_t addr, void *p)
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{
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oti_t *oti = (oti_t *)p;
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svga_t *svga = &oti->svga;
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uint8_t idx, temp;
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if (!oti->chip_id && !(oti->enable_register & 1) && (addr != 0x3C3))
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return 0xff;
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if ((((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && addr < 0x3de) &&
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!(svga->miscout & 1)) addr ^= 0x60;
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switch (addr) {
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case 0x3C2:
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if ((svga->vgapal[0].r + svga->vgapal[0].g + svga->vgapal[0].b) >= 0x50)
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temp = 0;
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else
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temp = 0x10;
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break;
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case 0x3C3:
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if (oti->chip_id)
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temp = svga_in(addr, svga);
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else
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temp = oti->enable_register;
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break;
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case 0x3CF:
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return svga->gdcreg[svga->gdcaddr & 0xf];
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case 0x3D4:
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temp = svga->crtcreg;
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break;
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case 0x3D5:
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if (oti->chip_id) {
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if (svga->crtcreg & 0x20)
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temp = 0xff;
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else
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temp = svga->crtc[svga->crtcreg];
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} else
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temp = svga->crtc[svga->crtcreg & 0x1f];
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break;
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case 0x3DA:
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if (oti->chip_id) {
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temp = svga_in(addr, svga);
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break;
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}
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svga->attrff = 0;
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/*The OTI-037C BIOS waits for bits 0 and 3 in 0x3da to go low, then reads 0x3da again
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and expects the diagnostic bits to equal the current border colour. As I understand
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it, the 0x3da active enable status does not include the border time, so this may be
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an area where OTI-037C is not entirely VGA compatible.*/
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svga->cgastat &= ~0x30;
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/* copy color diagnostic info from the overscan color register */
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switch (svga->attrregs[0x12] & 0x30)
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{
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case 0x00: /* P0 and P2 */
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if (svga->attrregs[0x11] & 0x01)
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svga->cgastat |= 0x10;
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if (svga->attrregs[0x11] & 0x04)
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svga->cgastat |= 0x20;
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break;
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case 0x10: /* P4 and P5 */
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if (svga->attrregs[0x11] & 0x10)
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svga->cgastat |= 0x10;
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if (svga->attrregs[0x11] & 0x20)
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svga->cgastat |= 0x20;
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break;
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case 0x20: /* P1 and P3 */
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if (svga->attrregs[0x11] & 0x02)
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svga->cgastat |= 0x10;
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if (svga->attrregs[0x11] & 0x08)
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svga->cgastat |= 0x20;
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break;
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case 0x30: /* P6 and P7 */
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if (svga->attrregs[0x11] & 0x40)
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svga->cgastat |= 0x10;
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if (svga->attrregs[0x11] & 0x80)
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svga->cgastat |= 0x20;
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break;
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}
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temp = svga->cgastat;
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break;
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case 0x3DE:
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temp = oti->index;
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if (oti->chip_id)
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temp |= (oti->chip_id << 5);
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break;
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case 0x3DF:
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idx = oti->index;
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if (!oti->chip_id)
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idx &= 0x1f;
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if (idx == 0x10)
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temp = oti->dipswitch_val;
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else
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temp = oti->regs[idx];
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break;
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default:
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temp = svga_in(addr, svga);
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break;
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}
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return(temp);
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}
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static void
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oti_pos_out(uint16_t addr, uint8_t val, void *p)
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{
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oti_t *oti = (oti_t *)p;
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if ((val ^ oti->pos) & 8) {
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if (val & 8)
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io_sethandler(0x03c0, 32, oti_in, NULL, NULL,
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oti_out, NULL, NULL, oti);
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else
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io_removehandler(0x03c0, 32, oti_in, NULL, NULL,
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oti_out, NULL, NULL, oti);
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}
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oti->pos = val;
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}
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static uint8_t
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oti_pos_in(uint16_t addr, void *p)
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{
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oti_t *oti = (oti_t *)p;
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return(oti->pos);
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}
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static void
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oti_recalctimings(svga_t *svga)
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{
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oti_t *oti = (oti_t *)svga->p;
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if (oti->regs[0x14] & 0x08) svga->ma_latch |= 0x10000;
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if (oti->regs[0x0d] & 0x0c) svga->rowoffset <<= 1;
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svga->interlace = oti->regs[0x14] & 0x80;
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}
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static void *
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oti_init(const device_t *info)
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{
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oti_t *oti = malloc(sizeof(oti_t));
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wchar_t *romfn = NULL;
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memset(oti, 0x00, sizeof(oti_t));
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oti->chip_id = info->local;
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oti->dipswitch_val = 0x18;
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switch(oti->chip_id) {
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case OTI_037C:
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romfn = BIOS_037C_PATH;
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oti->vram_size = 256;
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oti->regs[0] = 0x08; /* FIXME: The BIOS wants to read this at index 0? This index is undocumented. */
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/* io_sethandler(0x03c0, 32,
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oti_in, NULL, NULL, oti_out, NULL, NULL, oti); */
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break;
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case OTI_067_AMA932J:
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romfn = BIOS_067_AMA932J_PATH;
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oti->chip_id = 2;
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oti->vram_size = device_get_config_int("memory");
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oti->dipswitch_val |= 0x20;
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oti->pos = 0x08; /* Tell the BIOS the I/O ports are already enabled to avoid a double I/O handler mess. */
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io_sethandler(0x46e8, 1, oti_pos_in, NULL, NULL, oti_pos_out, NULL, NULL, oti);
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break;
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case OTI_067_M300:
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if (rom_present(BIOS_067_M300_15_PATH))
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romfn = BIOS_067_M300_15_PATH;
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else
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romfn = BIOS_067_M300_08_PATH;
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oti->vram_size = device_get_config_int("memory");
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oti->pos = 0x08; /* Tell the BIOS the I/O ports are already enabled to avoid a double I/O handler mess. */
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io_sethandler(0x46e8, 1, oti_pos_in, NULL, NULL, oti_pos_out, NULL, NULL, oti);
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break;
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case OTI_067:
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case OTI_077:
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romfn = BIOS_077_PATH;
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oti->vram_size = device_get_config_int("memory");
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oti->pos = 0x08; /* Tell the BIOS the I/O ports are already enabled to avoid a double I/O handler mess. */
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io_sethandler(0x46e8, 1, oti_pos_in, NULL, NULL, oti_pos_out, NULL, NULL, oti);
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break;
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}
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if (romfn != NULL) {
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rom_init(&oti->bios_rom, romfn,
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0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
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}
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oti->vram_mask = (oti->vram_size << 10) - 1;
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video_inform(VIDEO_FLAG_TYPE_SPECIAL, &timing_oti);
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svga_init(info, &oti->svga, oti, oti->vram_size << 10,
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oti_recalctimings, oti_in, oti_out, NULL, NULL);
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io_sethandler(0x03c0, 32,
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oti_in, NULL, NULL, oti_out, NULL, NULL, oti);
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oti->svga.miscout = 1;
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return(oti);
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}
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static void
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oti_close(void *p)
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{
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oti_t *oti = (oti_t *)p;
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svga_close(&oti->svga);
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free(oti);
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}
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static void
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oti_speed_changed(void *p)
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{
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oti_t *oti = (oti_t *)p;
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svga_recalctimings(&oti->svga);
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}
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static void
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oti_force_redraw(void *p)
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{
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oti_t *oti = (oti_t *)p;
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oti->svga.fullchange = changeframecount;
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}
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static int
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oti037c_available(void)
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{
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return(rom_present(BIOS_037C_PATH));
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}
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static int
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oti067_ama932j_available(void)
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{
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return(rom_present(BIOS_067_AMA932J_PATH));
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}
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static int
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oti067_077_available(void)
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{
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return(rom_present(BIOS_077_PATH));
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}
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static int
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oti067_m300_available(void)
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{
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if (rom_present(BIOS_067_M300_15_PATH))
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return(rom_present(BIOS_067_M300_15_PATH));
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else
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return(rom_present(BIOS_067_M300_08_PATH));
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}
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static const device_config_t oti067_config[] =
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{
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{
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"memory", "Memory size", CONFIG_SELECTION, "", 512, "", { 0 },
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{
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{
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"256 kB", 256
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},
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{
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"512 kB", 512
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},
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{
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""
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}
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}
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},
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{
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"", "", -1
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}
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};
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static const device_config_t oti067_ama932j_config[] =
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{
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{
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"memory", "Memory size", CONFIG_SELECTION, "", 256, "", { 0 },
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{
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{
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"256 kB", 256
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},
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{
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"512 kB", 512
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},
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{
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""
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}
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}
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},
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{
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"", "", -1
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}
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};
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static const device_config_t oti077_config[] =
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{
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{
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"memory", "Memory size", CONFIG_SELECTION, "", 1024, "", { 0 },
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{
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{
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"256 kB", 256
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},
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{
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"512 kB", 512
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},
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{
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"1 MB", 1024
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},
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{
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""
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}
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}
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},
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{
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"", "", -1
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}
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};
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const device_t oti037c_device =
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{
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"Oak OTI-037C",
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DEVICE_ISA,
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0,
|
|
oti_init, oti_close, NULL,
|
|
{ oti037c_available },
|
|
oti_speed_changed,
|
|
oti_force_redraw
|
|
};
|
|
|
|
const device_t oti067_device =
|
|
{
|
|
"Oak OTI-067",
|
|
DEVICE_ISA,
|
|
2,
|
|
oti_init, oti_close, NULL,
|
|
{ oti067_077_available },
|
|
oti_speed_changed,
|
|
oti_force_redraw,
|
|
oti067_config
|
|
};
|
|
|
|
const device_t oti067_m300_device =
|
|
{
|
|
"Oak OTI-067 (Olivetti M300-08/15)",
|
|
DEVICE_ISA,
|
|
4,
|
|
oti_init, oti_close, NULL,
|
|
{ oti067_m300_available },
|
|
oti_speed_changed,
|
|
oti_force_redraw,
|
|
oti067_config
|
|
};
|
|
|
|
const device_t oti067_ama932j_device =
|
|
{
|
|
"Oak OTI-067 (AMA-932J)",
|
|
DEVICE_ISA,
|
|
3,
|
|
oti_init, oti_close, NULL,
|
|
{ oti067_ama932j_available },
|
|
oti_speed_changed,
|
|
oti_force_redraw,
|
|
oti067_ama932j_config
|
|
};
|
|
|
|
const device_t oti077_device =
|
|
{
|
|
"Oak OTI-077",
|
|
DEVICE_ISA,
|
|
5,
|
|
oti_init, oti_close, NULL,
|
|
{ oti067_077_available },
|
|
oti_speed_changed,
|
|
oti_force_redraw,
|
|
oti077_config
|
|
};
|