147 lines
3.0 KiB
C
147 lines
3.0 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 ALi M-1429/1431 chipset.
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*
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* Version: @(#)ali1429.c 1.0.9 2019/10/09
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*
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* Authors: Sarah Walker, <tommowalker@tommowalker.co.uk>
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* Miran Grca, <mgrca8@gmail.com>
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*
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* Copyright 2008-2019 Sarah Walker.
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* Copyright 2016-2019 Miran Grca.
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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 "../cpu/cpu.h"
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#include "../timer.h"
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#include "../io.h"
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#include "../mem.h"
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#include "../device.h"
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#include "../keyboard.h"
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#include "../floppy/fdd.h"
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#include "../floppy/fdc.h"
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#include "../disk/hdc.h"
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#include "../disk/hdc_ide.h"
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#include "../timer.h"
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#include "../port_92.h"
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#include "chipset.h"
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typedef struct
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{
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uint8_t cur_reg,
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regs[256];
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} ali1429_t;
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static void
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ali1429_recalc(ali1429_t *dev)
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{
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uint32_t base;
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uint32_t i, shflags = 0;
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shadowbios = 0;
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shadowbios_write = 0;
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for (i = 0; i < 8; i++) {
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base = 0xc0000 + (i << 15);
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if (dev->regs[0x13] & (1 << i)) {
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shadowbios |= (base >= 0xe8000) && !!(dev->regs[0x14] & 0x01);
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shadowbios_write |= (base >= 0xe8000) && !!(dev->regs[0x14] & 0x02);
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shflags = (dev->regs[0x14] & 0x01) ? MEM_READ_INTERNAL : MEM_READ_EXTANY;
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shflags |= !(dev->regs[0x14] & 0x02) ? MEM_WRITE_EXTANY : MEM_WRITE_INTERNAL;
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mem_set_mem_state(base, 0x8000, shflags);
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} else
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mem_set_mem_state(base, 0x8000, MEM_READ_EXTANY | MEM_WRITE_EXTANY);
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}
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flushmmucache();
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}
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static void
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ali1429_write(uint16_t port, uint8_t val, void *priv)
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{
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ali1429_t *dev = (ali1429_t *) priv;
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if (port & 1) {
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dev->regs[dev->cur_reg] = val;
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switch (dev->cur_reg) {
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case 0x13:
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ali1429_recalc(dev);
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break;
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case 0x14:
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ali1429_recalc(dev);
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break;
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}
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} else
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dev->cur_reg = val;
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}
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static uint8_t
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ali1429_read(uint16_t port, void *priv)
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{
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uint8_t ret = 0xff;
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ali1429_t *dev = (ali1429_t *) priv;
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if (!(port & 1))
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ret = dev->cur_reg;
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else if (((dev->cur_reg >= 0xc0) || (dev->cur_reg == 0x20)) && cpu_iscyrix)
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ret = 0xff; /*Don't conflict with Cyrix config registers*/
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else
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ret = dev->regs[dev->cur_reg];
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return ret;
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}
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static void
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ali1429_close(void *priv)
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{
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ali1429_t *dev = (ali1429_t *) priv;
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free(dev);
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}
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static void *
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ali1429_init(const device_t *info)
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{
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ali1429_t *dev = (ali1429_t *) malloc(sizeof(ali1429_t));
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memset(dev, 0, sizeof(ali1429_t));
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memset(dev->regs, 0xff, 256);
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dev->regs[0x13] = dev->regs[0x14] = 0x00;
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io_sethandler(0x0022, 0x0002, ali1429_read, NULL, NULL, ali1429_write, NULL, NULL, dev);
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ali1429_recalc(dev);
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device_add(&port_92_device);
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return dev;
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}
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const device_t ali1429_device = {
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"ALi-M1429",
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0,
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0,
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ali1429_init, ali1429_close, NULL,
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NULL, NULL, NULL,
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NULL
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};
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