Re-added fully complete and working Olivetti and NCR 386SX-class machines.
Moved Olivetti M290 to dev branch. (Very) partially implemented Olivetti EVA gate array (used in M290).
This commit is contained in:
EngiNerd89
@@ -18,6 +18,7 @@ add_library(chipset OBJECT acc2168.c cs8230.c ali1217.c ali1429.c headland.c int
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neat.c opti495.c opti895.c opti5x7.c scamp.c scat.c via_vt82c49x.c
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via_vt82c505.c sis_85c310.c sis_85c4xx.c sis_85c496.c sis_85c50x.c
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gc100.c
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olivetti_eva.c
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opti283.c opti291.c via_apollo.c via_pipc.c wd76c10.c
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vl82c480.c)
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166
src/chipset/olivetti_eva.c
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166
src/chipset/olivetti_eva.c
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@@ -0,0 +1,166 @@
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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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* Implementation of the Olivetti EVA (98/86) Gate Array.
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*
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* Note: This chipset has no datasheet, everything were done via
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* reverse engineering the BIOS of various machines using it.
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*
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* Authors: EngiNerd <webmaster.crrc@yahoo.it>
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*
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* Copyright 2020-2021 EngiNerd
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*/
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.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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#define HAVE_STDARG_H
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#include <86box/86box.h>
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#include "cpu.h"
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#include <86box/timer.h>
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#include <86box/io.h>
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#include <86box/device.h>
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#include <86box/chipset.h>
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#include <86box/video.h>
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#include <86box/mem.h>
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typedef struct
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{
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uint8_t reg_065;
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uint8_t reg_067;
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uint8_t reg_069;
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} olivetti_eva_t;
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#ifdef ENABLE_OLIVETTI_EVA_LOG
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int olivetti_eva_do_log = ENABLE_OLIVETTI_EVA_LOG;
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static void
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olivetti_eva_log(const char *fmt, ...)
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{
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va_list ap;
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if (olivetti_eva_do_log) {
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va_start(ap, fmt);
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pclog_ex(fmt, ap);
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va_end(ap);
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}
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}
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#else
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#define olivetti_eva_log(fmt, ...)
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#endif
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static void
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olivetti_eva_write(uint16_t addr, uint8_t val, void *priv)
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{
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olivetti_eva_t *dev = (olivetti_eva_t *) priv;
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olivetti_eva_log("Olivetti EVA Gate Array: Write %02x at %02x\n", val, addr);
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switch (addr) {
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case 0x065:
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dev->reg_065 = val;
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break;
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case 0x067:
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dev->reg_067 = val;
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break;
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case 0x069:
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dev->reg_069 = val;
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/*
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* Unfortunately, if triggered, the BIOS remapping function fails causing
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* a fatal error. Therefore, this code section is currently commented.
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*/
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// if (val & 1){
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// /*
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// * Set the register to 7 or above for the BIOS to trigger the
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// * memory remapping function if shadowing is active.
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// */
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// dev->reg_069 = 0x7;
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// }
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// if (val & 8) {
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// /*
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// * Activate shadowing for region e0000-fffff
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// */
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// mem_remap_top(256);
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// mem_set_mem_state_both(0xa0000, 0x60000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
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// }
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break;
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}
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}
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static uint8_t
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olivetti_eva_read(uint16_t addr, void *priv)
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{
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olivetti_eva_t *dev = (olivetti_eva_t *) priv;
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uint8_t ret = 0xff;
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switch (addr) {
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case 0x065:
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ret = dev->reg_065;
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break;
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case 0x067:
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/* never happens */
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ret = dev->reg_067;
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break;
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case 0x069:
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ret = dev->reg_069;
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break;
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}
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olivetti_eva_log("Olivetti EVA Gate Array: Read %02x at %02x\n", ret, addr);
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return ret;
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}
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static void
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olivetti_eva_close(void *priv)
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{
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olivetti_eva_t *dev = (olivetti_eva_t *) priv;
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free(dev);
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}
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static void *
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olivetti_eva_init(const device_t *info)
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{
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olivetti_eva_t *dev = (olivetti_eva_t *) malloc(sizeof(olivetti_eva_t));
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memset(dev, 0, sizeof(olivetti_eva_t));
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/* GA98 registers */
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dev->reg_065 = 0x00;
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/* RAM page registers: never read, only set */
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dev->reg_067 = 0x00;
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/* RAM enable registers */
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dev->reg_069 = 0x0;
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io_sethandler(0x0065, 0x0001, olivetti_eva_read, NULL, NULL, olivetti_eva_write, NULL, NULL, dev);
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io_sethandler(0x0067, 0x0001, olivetti_eva_read, NULL, NULL, olivetti_eva_write, NULL, NULL, dev);
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io_sethandler(0x0069, 0x0001, olivetti_eva_read, NULL, NULL, olivetti_eva_write, NULL, NULL, dev);
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/* When shadowing is not enabled in BIOS, all upper memory is available as XMS */
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mem_remap_top(384);
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/*
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* Default settings when NVRAM is cleared activate shadowing.
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* Thus, to avoid boot errors, remap only 256k from UMB to XMS.
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* Remove this block once BIOS memory remapping works.
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*/
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mem_remap_top(256);
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return dev;
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}
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const device_t olivetti_eva_device = {
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"Olivetti EVA Gate Array",
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0,
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0,
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olivetti_eva_init, olivetti_eva_close, NULL,
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{ NULL }, NULL, NULL,
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NULL
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};
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