301 lines
6.8 KiB
C
301 lines
6.8 KiB
C
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/*
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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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* Emulation of the TI CF62011 SVGA chip.
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*
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* This chip was used in several of IBM's later machines, such
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* as the PS/1 Model 2121, and a number of PS/2 models. As noted
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* in an article on Usenet:
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*
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* "In the early 90s IBM looked for some cheap VGA card to
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* substitute the (relatively) expensive XGA-2 adapter for
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* *servers*, where the primary purpose is supervision of the
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* machine rather than real *work* with it in Hi-Res. It was
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* just to supply a base video, where a XGA-2 were a waste of
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* potential. They had a contract with TI for some DSPs in
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* multimedia already (the MWave for instance is based on
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* TI-DSPs as well as many Thinkpad internal chipsets) and TI
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* offered them a rather cheap – and inexpensive – chipset
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* and combined it with a cheap clock oscillator and an Inmos
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* RAMDAC. That chipset was already pretty much outdated at
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* that time but IBM decided it would suffice for that low
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* end purpose.
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*
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* Driver support was given under DOS and OS/2 only for base
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* functions like selection of the vertical refresh and few
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* different modes only. Not even the Win 3.x support has
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* been finalized. Technically the adapter could do better
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* than VGA, but its video BIOS is largely undocumented and
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* intentionally crippled down to a few functions."
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*
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* This chip is reportedly the same one as used in the MCA
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* IBM SVGA Adapter/A (ID 090EEh), which mostly had faster
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* VRAM and RAMDAC. The VESA DOS graphics driver for that
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* card can be used: m95svga.exe
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*
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* The controller responds at ports in the range 0x2100-0x210F,
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* which are the same as the XGA. It supports up to 1MB of VRAM,
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* but we lock it down to 512K. The PS/1 2122 had 256K.
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*
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* Version: @(#)vid_ti_cf62011.c 1.0.2 2017/11/05
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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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* Fred N. van Kempen, <decwiz@yahoo.com>
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*
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* Copyright 2008-2017 Sarah Walker.
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* Copyright 2016,2017 Miran Grca.
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* Copyright 2017 Fred N. van Kempen.
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*/
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#include <stdio.h>
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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.h"
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#include "../config.h"
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#include "../io.h"
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#include "../mem.h"
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#include "../rom.h"
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#include "../device.h"
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#include "../video/video.h"
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#include "../video/vid_vga.h"
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#include "../video/vid_svga.h"
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#include "vid_ti_cf62011.h"
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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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uint32_t vram_size;
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uint8_t banking;
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uint8_t reg_2100;
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uint8_t reg_210a;
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} tivga_t;
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static void
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vid_out(uint16_t addr, uint8_t val, void *priv)
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{
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tivga_t *ti = (tivga_t *)priv;
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svga_t *svga = &ti->svga;
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uint8_t old;
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if (((addr & 0xfff0) == 0x3d0 ||
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(addr & 0xfff0) == 0x3b0) && !(svga->miscout & 1)) addr ^= 0x60;
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switch (addr) {
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case 0x3D4:
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svga->crtcreg = val & 0x1f;
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return;
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case 0x3D5:
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if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
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return;
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if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
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val = (svga->crtc[7] & ~0x10) | (val & 0x10);
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old = svga->crtc[svga->crtcreg];
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svga->crtc[svga->crtcreg] = val;
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if (old != val) {
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if (svga->crtcreg < 0xe || svga->crtcreg > 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 0x2100:
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ti->reg_2100 = val;
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if ((val & 7) < 4)
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svga->write_bank = 0;
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else
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svga->write_bank = (ti->banking & 0x7) * 0x10000;
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svga->read_bank = svga->write_bank;
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break;
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case 0x2108:
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if ((ti->reg_2100 & 7) >= 4)
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svga->write_bank = (val & 0x7) * 0x10000;
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svga->read_bank = svga->write_bank;
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ti->banking = val;
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break;
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case 0x210a:
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ti->reg_210a = val;
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break;
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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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vid_in(uint16_t addr, void *priv)
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{
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tivga_t *ti = (tivga_t *)priv;
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svga_t *svga = &ti->svga;
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uint8_t ret;
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if (((addr & 0xfff0) == 0x3d0 ||
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(addr & 0xfff0) == 0x3b0) && !(svga->miscout & 1)) addr ^= 0x60;
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switch (addr) {
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case 0x100:
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ret = 0xfe;
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break;
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case 0x101:
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ret = 0xe8;
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break;
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case 0x3D4:
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ret = svga->crtcreg;
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break;
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case 0x3D5:
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ret = svga->crtc[svga->crtcreg];
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break;
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case 0x2108:
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ret = ti->banking;
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break;
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case 0x210a:
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ret = ti->reg_210a;
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break;
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default:
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ret = svga_in(addr, svga);
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break;
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}
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return(ret);
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}
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static void
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vid_speed_changed(void *priv)
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{
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tivga_t *ti = (tivga_t *)priv;
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svga_recalctimings(&ti->svga);
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}
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static void
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vid_force_redraw(void *priv)
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{
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tivga_t *ti = (tivga_t *)priv;
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ti->svga.fullchange = changeframecount;
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}
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static void
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vid_add_status_info(char *s, int max_len, void *priv)
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{
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tivga_t *ti = (tivga_t *)priv;
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svga_add_status_info(s, max_len, &ti->svga);
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}
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static void
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vid_close(void *priv)
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{
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tivga_t *ti = (tivga_t *)priv;
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svga_close(&ti->svga);
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free(ti);
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}
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static void *
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vid_init(device_t *info)
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{
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tivga_t *ti;
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/* Allocate control block and initialize. */
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ti = (tivga_t *)malloc(sizeof(tivga_t));
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memset(ti, 0x00, sizeof(tivga_t));
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/* Set amount of VRAM in KB. */
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if (info->local == 0)
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ti->vram_size = device_get_config_int("vram_size");
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else
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ti->vram_size = info->local;
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pclog("VIDEO: initializing %s, %dK VRAM\n", info->name, ti->vram_size);
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svga_init(&ti->svga, ti, ti->vram_size<<10, NULL, vid_in, vid_out, NULL, NULL);
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io_sethandler(0x0100, 2, vid_in, NULL, NULL, vid_out, NULL, NULL, ti);
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io_sethandler(0x03c0, 32, vid_in, NULL, NULL, vid_out, NULL, NULL, ti);
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io_sethandler(0x2100, 16, vid_in, NULL, NULL, vid_out, NULL, NULL, ti);
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ti->svga.bpp = 8;
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ti->svga.miscout = 1;
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return(ti);
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}
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static device_config_t vid_config[] =
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{
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{
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"vram_size", "Memory Size", CONFIG_SELECTION, "", 256,
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{
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{
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"256K", 256
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},
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{
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"512K", 512
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},
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{
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"1024K", 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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device_t ti_cf62011_device = {
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"TI CF62011 SVGA",
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0,
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0,
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vid_init, vid_close, NULL,
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NULL,
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vid_speed_changed,
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vid_force_redraw,
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vid_add_status_info,
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vid_config
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};
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device_t ibm_ps1_2121_device = {
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"IBM PS/1 Model 2121 SVGA",
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0,
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256,
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vid_init, vid_close, NULL,
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NULL,
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vid_speed_changed,
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vid_force_redraw,
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vid_add_status_info,
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NULL
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};
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