407 lines
7.5 KiB
C
407 lines
7.5 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 M6117 SoC.
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*
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*
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*
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* Authors: RichardG, <richardg867@gmail.com>
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*
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* Copyright 2020 RichardG.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdarg.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 <86box/mem.h>
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#include <86box/io.h>
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#include <86box/pci.h>
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#include <86box/pic.h>
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#include <86box/timer.h>
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#include <86box/pit.h>
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#include <86box/device.h>
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#include <86box/port_92.h>
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#include <86box/usb.h>
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#include <86box/hdc.h>
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#include <86box/hdc_ide.h>
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#include <86box/chipset.h>
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typedef struct ali6117_t
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{
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uint32_t local;
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/* Main registers (port 22h/23h) */
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uint8_t unlocked;
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uint8_t reg_offset;
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uint8_t regs[256];
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} ali6117_t;
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#ifdef ENABLE_ALI6117_LOG
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int ali6117_do_log = ENABLE_ALI6117_LOG;
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static void
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ali6117_log(const char *fmt, ...)
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{
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va_list ap;
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if (ali6117_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 ali6117_log(fmt, ...)
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#endif
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static void
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ali6117_recalcmapping(ali6117_t *dev)
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{
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uint8_t reg, bitpair;
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uint32_t base, size;
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int state;
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shadowbios = 0;
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shadowbios_write = 0;
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ali6117_log("ALI6117: Shadowing for A0000-BFFFF (reg 12 bit 1) = %s\n", (dev->regs[0x12] & 0x02) ? "on" : "off");
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mem_set_mem_state(0xa0000, 0x20000, (dev->regs[0x12] & 0x02) ? (MEM_WRITE_INTERNAL | MEM_READ_INTERNAL) : (MEM_WRITE_EXTANY | MEM_READ_EXTANY));
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for (reg = 0; reg <= 1; reg++) {
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for (bitpair = 0; bitpair <= 3; bitpair++) {
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size = 0x8000;
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base = 0xc0000 + (size * ((reg * 4) + bitpair));
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ali6117_log("ALI6117: Shadowing for %05X-%05X (reg %02X bp %d wmask %02X rmask %02X) =", base, base + size - 1, 0x14 + reg, bitpair, 1 << ((bitpair * 2) + 1), 1 << (bitpair * 2));
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state = 0;
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if (dev->regs[0x14 + reg] & (1 << ((bitpair * 2) + 1))) {
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ali6117_log(" w on");
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state |= MEM_WRITE_INTERNAL;
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if (base >= 0xe0000)
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shadowbios_write |= 1;
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} else {
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ali6117_log(" w off");
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state |= MEM_WRITE_EXTANY;
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}
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if (dev->regs[0x14 + reg] & (1 << (bitpair * 2))) {
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ali6117_log("; r on\n");
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state |= MEM_READ_INTERNAL;
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if (base >= 0xe0000)
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shadowbios |= 1;
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} else {
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ali6117_log("; r off\n");
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state |= MEM_READ_EXTANY;
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}
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mem_set_mem_state(base, size, state);
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}
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}
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flushmmucache_nopc();
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}
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static void
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ali6117_reg_write(uint16_t addr, uint8_t val, void *priv)
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{
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ali6117_t *dev = (ali6117_t *) priv;
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ali6117_log("ALI6117: reg_write(%04X, %02X)\n", addr, val);
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if (addr == 0x22)
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dev->reg_offset = val;
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else if (dev->reg_offset == 0x13)
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dev->unlocked = (val == 0xc5);
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else if (dev->unlocked) {
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ali6117_log("ALI6117: regs[%02X] = %02X\n", dev->reg_offset, val);
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if (!(dev->local & 0x08) || (dev->reg_offset < 0x30)) switch (dev->reg_offset) {
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case 0x30: case 0x34: case 0x35: case 0x3e:
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case 0x3f: case 0x46: case 0x4c: case 0x6a:
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case 0x73:
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return; /* read-only registers */
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case 0x10:
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refresh_at_enable = !(val & 0x02) || !!(dev->regs[0x20] & 0x80);
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break;
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case 0x12:
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val &= 0xf7;
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/* FALL-THROUGH */
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case 0x14: case 0x15:
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dev->regs[dev->reg_offset] = val;
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ali6117_recalcmapping(dev);
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break;
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case 0x1e:
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val &= 0x07;
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switch (val) {
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/* Half PIT clock. */
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case 0x0:
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cpu_set_isa_speed(7159091);
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break;
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/* Divisors on the input clock PCLK2, which is double the CPU clock. */
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case 0x1:
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cpu_set_isa_speed(cpu_busspeed / 1.5);
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break;
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case 0x2:
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cpu_set_isa_speed(cpu_busspeed / 2);
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break;
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case 0x3:
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cpu_set_isa_speed(cpu_busspeed / 2.5);
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break;
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case 0x4:
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cpu_set_isa_speed(cpu_busspeed / 3);
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break;
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case 0x5:
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cpu_set_isa_speed(cpu_busspeed / 4);
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break;
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case 0x6:
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cpu_set_isa_speed(cpu_busspeed / 5);
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break;
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case 0x7:
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cpu_set_isa_speed(cpu_busspeed / 6);
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break;
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}
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break;
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case 0x20:
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val &= 0xbf;
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refresh_at_enable = !(dev->regs[0x10] & 0x02) || !!(val & 0x80);
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break;
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case 0x31:
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/* TODO: fast gate A20 (bit 0) */
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val &= 0x21;
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break;
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case 0x32:
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val &= 0xc1;
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break;
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case 0x33:
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val &= 0xfd;
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break;
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case 0x36:
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val &= 0xf0;
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val |= dev->regs[dev->reg_offset];
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break;
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case 0x37:
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val &= 0xf5;
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break;
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case 0x3c:
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val &= 0x8f;
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ide_pri_disable();
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ide_set_base(1, (val & 0x01) ? 0x170 : 0x1f0);
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ide_set_side(1, (val & 0x01) ? 0x376 : 0x3f6);
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ide_pri_enable();
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break;
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case 0x44: case 0x45:
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val &= 0x3f;
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break;
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case 0x4a:
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val &= 0xfe;
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break;
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case 0x55:
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val &= 0x03;
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break;
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case 0x56:
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val &= 0xc7;
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break;
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case 0x58:
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val &= 0xc3;
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break;
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case 0x59:
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val &= 0x60;
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break;
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case 0x5b:
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val &= 0x1f;
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break;
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case 0x64:
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val &= 0xf7;
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break;
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case 0x66:
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val &= 0xe3;
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break;
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case 0x67:
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val &= 0xdf;
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break;
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case 0x69:
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val &= 0x50;
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break;
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case 0x6b:
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val &= 0x7f;
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break;
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case 0x6e: case 0x6f:
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val &= 0x03;
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break;
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case 0x71:
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val &= 0x1f;
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break;
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}
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dev->regs[dev->reg_offset] = val;
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}
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}
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static uint8_t
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ali6117_reg_read(uint16_t addr, void *priv)
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{
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ali6117_t *dev = (ali6117_t *) priv;
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uint8_t ret;
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if (addr == 0x22)
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ret = dev->reg_offset;
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else
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ret = dev->regs[dev->reg_offset];
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ali6117_log("ALI6117: reg_read(%04X) = %02X\n", dev->reg_offset, ret);
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return ret;
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}
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static void
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ali6117_reset(void *priv)
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{
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ali6117_t *dev = (ali6117_t *) priv;
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ali6117_log("ALI6117: reset()\n");
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memset(dev->regs, 0, sizeof(dev->regs));
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dev->regs[0x11] = 0xf8;
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dev->regs[0x12] = 0x20;
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dev->regs[0x17] = 0xff;
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dev->regs[0x18] = 0xf0;
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dev->regs[0x1a] = 0xff;
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dev->regs[0x1b] = 0xf0;
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dev->regs[0x1d] = 0xff;
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dev->regs[0x20] = 0x80;
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if (dev->local & 0x08) {
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dev->regs[0x30] = 0x08;
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dev->regs[0x31] = 0x01;
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dev->regs[0x34] = 0x04; /* enable internal RTC */
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dev->regs[0x35] = 0x20; /* enable internal KBC */
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dev->regs[0x36] = dev->local & 0x07; /* M6117D ID */
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}
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cpu_set_isa_speed(7159091);
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refresh_at_enable = 1;
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}
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static void
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ali6117_setup(ali6117_t *dev)
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{
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ali6117_log("ALI6117: setup()\n");
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/* Main register interface */
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io_sethandler(0x22, 2,
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ali6117_reg_read, NULL, NULL, ali6117_reg_write, NULL, NULL, dev);
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}
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static void
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ali6117_close(void *priv)
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{
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ali6117_t *dev = (ali6117_t *) priv;
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ali6117_log("ALI6117: close()\n");
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io_removehandler(0x22, 2,
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ali6117_reg_read, NULL, NULL, ali6117_reg_write, NULL, NULL, dev);
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free(dev);
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}
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static void *
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ali6117_init(const device_t *info)
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{
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ali6117_log("ALI6117: init()\n");
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ali6117_t *dev = (ali6117_t *) malloc(sizeof(ali6117_t));
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memset(dev, 0, sizeof(ali6117_t));
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dev->local = info->local;
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device_add(&ide_isa_device);
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ali6117_setup(dev);
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ali6117_reset(dev);
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if (!(dev->local & 0x08))
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pic_elcr_io_handler(0);
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return dev;
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}
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const device_t ali1217_device =
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{
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"ALi M1217",
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DEVICE_AT,
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0x8,
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ali6117_init,
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ali6117_close,
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ali6117_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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};
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const device_t ali6117d_device =
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{
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"ALi M6117D",
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DEVICE_AT,
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0x2,
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ali6117_init,
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ali6117_close,
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ali6117_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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};
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