377 lines
7.6 KiB
C
377 lines
7.6 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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* Emulation of the NatSemi PC87332 Super I/O chip.
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*
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*
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*
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* Author: Miran Grca, <mgrca8@gmail.com>
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* Copyright 2020 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/86box.h>
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#include <86box/io.h>
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#include <86box/timer.h>
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#include <86box/device.h>
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#include <86box/lpt.h>
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#include <86box/mem.h>
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#include <86box/nvr.h>
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#include <86box/pci.h>
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#include <86box/rom.h>
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#include <86box/serial.h>
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#include <86box/hdc.h>
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#include <86box/hdc_ide.h>
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#include <86box/fdd.h>
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#include <86box/fdc.h>
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#include <86box/sio.h>
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typedef struct {
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uint8_t tries, has_ide,
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fdc_on, regs[15];
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int cur_reg;
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fdc_t *fdc;
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serial_t *uart[2];
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} pc87332_t;
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static void
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lpt1_handler(pc87332_t *dev)
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{
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int temp;
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uint16_t lpt_port = 0x378;
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uint8_t lpt_irq = 5;
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temp = dev->regs[0x01] & 3;
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switch (temp) {
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case 0:
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lpt_port = 0x378;
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lpt_irq = (dev->regs[0x02] & 0x08) ? 7 : 5;
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break;
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case 1:
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lpt_port = 0x3bc;
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lpt_irq = 7;
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break;
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case 2:
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lpt_port = 0x278;
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lpt_irq = 5;
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break;
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case 3:
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lpt_port = 0x000;
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lpt_irq = 0xff;
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break;
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}
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if (lpt_port)
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lpt1_init(lpt_port);
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lpt1_irq(lpt_irq);
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}
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static void
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serial_handler(pc87332_t *dev, int uart)
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{
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int temp;
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temp = (dev->regs[1] >> (2 << uart)) & 3;
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switch (temp) {
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case 0:
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serial_setup(dev->uart[uart], SERIAL1_ADDR, 4);
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break;
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case 1:
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serial_setup(dev->uart[uart], SERIAL2_ADDR, 3);
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break;
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case 2:
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switch ((dev->regs[1] >> 6) & 3) {
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case 0:
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serial_setup(dev->uart[uart], 0x3e8, 4);
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break;
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case 1:
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serial_setup(dev->uart[uart], 0x338, 4);
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break;
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case 2:
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serial_setup(dev->uart[uart], 0x2e8, 4);
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break;
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case 3:
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serial_setup(dev->uart[uart], 0x220, 4);
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break;
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}
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break;
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case 3:
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switch ((dev->regs[1] >> 6) & 3) {
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case 0:
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serial_setup(dev->uart[uart], 0x2e8, 3);
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break;
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case 1:
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serial_setup(dev->uart[uart], 0x238, 3);
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break;
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case 2:
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serial_setup(dev->uart[uart], 0x2e0, 3);
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break;
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case 3:
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serial_setup(dev->uart[uart], 0x228, 3);
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break;
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}
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break;
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}
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}
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static void
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ide_handler(pc87332_t *dev)
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{
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/* TODO: Make an ide_disable(channel) and ide_enable(channel) so we can simplify this. */
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if (dev->has_ide == 2) {
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ide_sec_disable();
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ide_set_base(1, (dev->regs[0x00] & 0x80) ? 0x170 : 0x1f0);
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ide_set_side(1, (dev->regs[0x00] & 0x80) ? 0x376 : 0x3f6);
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if (dev->regs[0x00] & 0x40)
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ide_sec_enable();
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} else if (dev->has_ide == 1) {
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ide_pri_disable();
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ide_set_base(0, (dev->regs[0x00] & 0x80) ? 0x170 : 0x1f0);
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ide_set_side(0, (dev->regs[0x00] & 0x80) ? 0x376 : 0x3f6);
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if (dev->regs[0x00] & 0x40)
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ide_pri_enable();
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}
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}
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static void
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pc87332_write(uint16_t port, uint8_t val, void *priv)
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{
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pc87332_t *dev = (pc87332_t *) priv;
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uint8_t index, valxor;
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index = (port & 1) ? 0 : 1;
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if (index) {
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dev->cur_reg = val & 0x1f;
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dev->tries = 0;
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return;
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} else {
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if (dev->tries) {
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valxor = val ^ dev->regs[dev->cur_reg];
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dev->tries = 0;
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if ((dev->cur_reg <= 14) && (dev->cur_reg != 8))
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dev->regs[dev->cur_reg] = val;
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else
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return;
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} else {
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dev->tries++;
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return;
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}
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}
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switch(dev->cur_reg) {
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case 0:
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if (valxor & 1) {
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lpt1_remove();
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if ((val & 1) && !(dev->regs[2] & 1))
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lpt1_handler(dev);
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}
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if (valxor & 2) {
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serial_remove(dev->uart[0]);
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if ((val & 2) && !(dev->regs[2] & 1))
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serial_handler(dev, 0);
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}
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if (valxor & 4) {
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serial_remove(dev->uart[1]);
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if ((val & 4) && !(dev->regs[2] & 1))
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serial_handler(dev, 1);
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}
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if (valxor & 0x28) {
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fdc_remove(dev->fdc);
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if ((val & 8) && !(dev->regs[2] & 1))
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fdc_set_base(dev->fdc, (val & 0x20) ? 0x370 : 0x3f0);
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}
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if (dev->has_ide && (valxor & 0xc0))
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ide_handler(dev);
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break;
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case 1:
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if (valxor & 3) {
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lpt1_remove();
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if ((dev->regs[0] & 1) && !(dev->regs[2] & 1))
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lpt1_handler(dev);
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}
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if (valxor & 0xcc) {
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serial_remove(dev->uart[0]);
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if ((dev->regs[0] & 2) && !(dev->regs[2] & 1))
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serial_handler(dev, 0);
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}
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if (valxor & 0xf0) {
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serial_remove(dev->uart[1]);
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if ((dev->regs[0] & 4) && !(dev->regs[2] & 1))
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serial_handler(dev, 1);
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}
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break;
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case 2:
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if (valxor & 1) {
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lpt1_remove();
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serial_remove(dev->uart[0]);
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serial_remove(dev->uart[1]);
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fdc_remove(dev->fdc);
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if (!(val & 1)) {
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if (dev->regs[0] & 1)
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lpt1_handler(dev);
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if (dev->regs[0] & 2)
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serial_handler(dev, 0);
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if (dev->regs[0] & 4)
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serial_handler(dev, 1);
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if (dev->regs[0] & 8)
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fdc_set_base(dev->fdc, (dev->regs[0] & 0x20) ? 0x370 : 0x3f0);
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}
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}
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if (valxor & 8) {
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lpt1_remove();
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if ((dev->regs[0] & 1) && !(dev->regs[2] & 1))
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lpt1_handler(dev);
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}
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break;
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}
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}
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uint8_t
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pc87332_read(uint16_t port, void *priv)
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{
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pc87332_t *dev = (pc87332_t *) priv;
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uint8_t ret = 0xff, index;
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index = (port & 1) ? 0 : 1;
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dev->tries = 0;
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if (index)
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ret = dev->cur_reg & 0x1f;
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else {
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if (dev->cur_reg == 8)
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ret = 0x10;
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else if (dev->cur_reg < 14)
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ret = dev->regs[dev->cur_reg];
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}
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return ret;
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}
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void
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pc87332_reset(pc87332_t *dev)
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{
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memset(dev->regs, 0, 15);
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dev->regs[0x00] = dev->fdc_on ? 0x4f : 0x07;
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if (dev->has_ide == 2)
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dev->regs[0x00] |= 0x80;
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dev->regs[0x01] = 0x10;
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dev->regs[0x03] = 0x01;
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dev->regs[0x05] = 0x0D;
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dev->regs[0x08] = 0x70;
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/*
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0 = 360 rpm @ 500 kbps for 3.5"
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1 = Default, 300 rpm @ 500,300,250,1000 kbps for 3.5"
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*/
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lpt1_remove();
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lpt1_handler(dev);
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serial_remove(dev->uart[0]);
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serial_remove(dev->uart[1]);
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serial_handler(dev, 0);
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serial_handler(dev, 1);
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fdc_reset(dev->fdc);
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if (!dev->fdc_on)
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fdc_remove(dev->fdc);
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if (dev->has_ide)
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ide_handler(dev);
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}
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static void
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pc87332_close(void *priv)
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{
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pc87332_t *dev = (pc87332_t *) priv;
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free(dev);
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}
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static void *
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pc87332_init(const device_t *info)
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{
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pc87332_t *dev = (pc87332_t *) malloc(sizeof(pc87332_t));
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memset(dev, 0, sizeof(pc87332_t));
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dev->fdc = device_add(&fdc_at_nsc_device);
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dev->uart[0] = device_add_inst(&ns16550_device, 1);
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dev->uart[1] = device_add_inst(&ns16550_device, 2);
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dev->has_ide = (info->local >> 8) & 0xff;
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dev->fdc_on = (info->local >> 16) & 0xff;
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pc87332_reset(dev);
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if ((info->local & 0xff) == (0x01)) {
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io_sethandler(0x398, 0x0002,
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pc87332_read, NULL, NULL, pc87332_write, NULL, NULL, dev);
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} else {
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io_sethandler(0x02e, 0x0002,
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pc87332_read, NULL, NULL, pc87332_write, NULL, NULL, dev);
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}
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return dev;
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}
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const device_t pc87332_device = {
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"National Semiconductor PC87332 Super I/O",
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0,
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0x00,
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pc87332_init, pc87332_close, NULL,
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{ NULL }, NULL, NULL,
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NULL
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};
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const device_t pc87332_398_device = {
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"National Semiconductor PC87332 Super I/O (Port 398h)",
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0,
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0x01,
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pc87332_init, pc87332_close, NULL,
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{ NULL }, NULL, NULL,
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NULL
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};
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const device_t pc87332_398_ide_device = {
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"National Semiconductor PC87332 Super I/O (Port 398h) (With IDE)",
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0,
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0x101,
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pc87332_init, pc87332_close, NULL,
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{ NULL }, NULL, NULL,
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NULL
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};
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const device_t pc87332_398_ide_fdcon_device = {
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"National Semiconductor PC87332 Super I/O (Port 398h) (With IDE and FDC on)",
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0,
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0x10101,
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pc87332_init, pc87332_close, NULL,
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{ NULL }, NULL, NULL,
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NULL
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};
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