181 lines
4.0 KiB
C
181 lines
4.0 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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* Implementation of the UMC 8890 Chipset.
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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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*
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* Authors: Tiseno100,
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*
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* Copyright 2021 Tiseno100.
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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/apm.h>
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#include <86box/mem.h>
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#include <86box/pci.h>
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#include <86box/port_92.h>
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#include <86box/smram.h>
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#include <86box/chipset.h>
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#ifdef ENABLE_UMC_8890_LOG
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int umc_8890_do_log = ENABLE_UMC_8890_LOG;
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static void
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umc_8890_log(const char *fmt, ...)
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{
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va_list ap;
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if (umc_8890_do_log)
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{
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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 umc_8890_log(fmt, ...)
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#endif
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/* Shadow RAM Flags */
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#define ENABLE_SHADOW (MEM_READ_INTERNAL | MEM_WRITE_INTERNAL)
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#define DISABLE_SHADOW (MEM_READ_EXTANY | MEM_WRITE_EXTANY)
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typedef struct umc_8890_t
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{
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apm_t *apm;
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smram_t *smram;
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uint8_t pci_conf[256];
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} umc_8890_t;
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uint16_t umc_8890_shadow_flag(uint8_t flag)
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{
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return (flag & 1) ? (MEM_READ_INTERNAL | ((flag & 2) ? MEM_WRITE_DISABLED : MEM_WRITE_INTERNAL)) : (MEM_READ_EXTANY | MEM_WRITE_EXTANY);
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}
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void umc_8890_shadow(umc_8890_t *dev)
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{
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mem_set_mem_state_both(0xe0000, 0x10000, umc_8890_shadow_flag((dev->pci_conf[0x5f] & 0x0c) >> 2));
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mem_set_mem_state_both(0xf0000, 0x10000, umc_8890_shadow_flag((dev->pci_conf[0x5f] & 0xc0) >> 6));
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for(int i = 0; i < 8; i++)
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mem_set_mem_state_both(0xc0000 + (i << 14), 0x4000, umc_8890_shadow_flag(!!(dev->pci_conf[0x5d] & (1 << i))));
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flushmmucache_nopc();
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}
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static void
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um8890_write(int func, int addr, uint8_t val, void *priv)
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{
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umc_8890_t *dev = (umc_8890_t *)priv;
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dev->pci_conf[addr] = val;
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switch (addr)
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{
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case 0x5c:
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case 0x5d:
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case 0x5e:
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case 0x5f:
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umc_8890_shadow(dev);
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break;
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case 0x65: /* We don't know the default SMRAM values */
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smram_disable_all();
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smram_enable(dev->smram, 0xe0000, 0xe0000, 0x10000, dev->pci_conf[0x65] & 0x10, 1);
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flushmmucache_nopc();
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break;
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}
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umc_8890_log("UM8890: dev->regs[%02x] = %02x POST: %02x\n", addr, dev->pci_conf[addr], inb(0x80));
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}
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static uint8_t
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um8890_read(int func, int addr, void *priv)
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{
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umc_8890_t *dev = (umc_8890_t *)priv;
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return dev->pci_conf[addr];
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}
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static void
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umc_8890_reset(void *priv)
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{
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umc_8890_t *dev = (umc_8890_t *)priv;
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/* Defaults */
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dev->pci_conf[0] = 0x60; /* UMC */
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dev->pci_conf[1] = 0x10;
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dev->pci_conf[2] = 0x91; /* 8891F */
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dev->pci_conf[3] = 0x88;
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dev->pci_conf[8] = 1;
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dev->pci_conf[0x09] = 0x00;
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dev->pci_conf[0x0a] = 0x00;
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dev->pci_conf[0x0b] = 0x06;
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}
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static void
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umc_8890_close(void *priv)
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{
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umc_8890_t *dev = (umc_8890_t *)priv;
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smram_del(dev->smram);
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free(dev);
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}
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static void *
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umc_8890_init(const device_t *info)
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{
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umc_8890_t *dev = (umc_8890_t *)malloc(sizeof(umc_8890_t));
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memset(dev, 0, sizeof(umc_8890_t));
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pci_add_card(PCI_ADD_NORTHBRIDGE, um8890_read, um8890_write, dev); /* Device 0: UMC 8890 */
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/* APM */
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dev->apm = device_add(&apm_pci_device);
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/* SMRAM(Needs excessive documentation before we begin SMM implementation) */
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dev->smram = smram_add();
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/* Port 92 */
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device_add(&port_92_pci_device);
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umc_8890_reset(dev);
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return dev;
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}
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const device_t umc_8890_device = {
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"UMC 8890(8891BF/8892BF)",
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DEVICE_PCI,
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0x886a,
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umc_8890_init,
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umc_8890_close,
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umc_8890_reset,
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{NULL},
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NULL,
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NULL,
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NULL};
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