181 lines
3.7 KiB
C
181 lines
3.7 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 M1429 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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* Authors: Tiseno100
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*
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* Copyright 2020 Tiseno100
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*
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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/fdd.h>
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#include <86box/fdc.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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#define disabled_shadow (MEM_READ_EXTANY | MEM_WRITE_EXTANY)
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#ifdef ENABLE_ALI1429_LOG
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int ali1429_do_log = ENABLE_ALI1429_LOG;
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static void
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ali1429_log(const char *fmt, ...)
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{
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va_list ap;
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if (ali1429_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 ali1429_log(fmt, ...)
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#endif
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typedef struct
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{
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uint8_t index, cfg_locked,
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regs[256];
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smram_t *smram;
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} ali1429_t;
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static void ali1429_shadow_recalc(ali1429_t *dev)
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{
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uint32_t base, i, can_write, can_read;
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shadowbios = (dev->regs[0x13] & 0x40) && (dev->regs[0x14] & 0x01);
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shadowbios_write = (dev->regs[0x13] & 0x40) && (dev->regs[0x14] & 0x02);
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can_write = (dev->regs[0x14] & 0x02) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY;
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can_read = (dev->regs[0x14] & 0x01) ? MEM_READ_INTERNAL : MEM_READ_EXTANY;
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for (i = 0; i < 8; i++)
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{
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base = 0xc0000 + (i << 15);
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if (dev->regs[0x13] & (1 << i))
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mem_set_mem_state_both(base, 0x8000, can_read | can_write);
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else
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mem_set_mem_state_both(base, 0x8000, disabled_shadow);
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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 addr, uint8_t val, void *priv)
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{
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ali1429_t *dev = (ali1429_t *)priv;
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switch (addr)
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{
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case 0x22:
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dev->index = val;
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break;
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case 0x23:
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if (dev->index != 0x03)
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ali1429_log("M1429: dev->regs[%02x] = %02x\n", dev->index, val);
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if (dev->index == 0x03)
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dev->cfg_locked = !(val == 0xc5);
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if (!dev->cfg_locked)
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{
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dev->regs[dev->index] = val;
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switch (dev->index)
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{
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case 0x13:
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case 0x14:
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ali1429_shadow_recalc(dev);
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break;
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case 0x18:
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cpu_cache_ext_enabled = !!(val & 2);
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cpu_update_waitstates();
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break;
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}
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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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ali1429_read(uint16_t addr, void *priv)
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{
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ali1429_t *dev = (ali1429_t *)priv;
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return (addr == 0x23) ? dev->regs[dev->index] : 0xff;
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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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/*
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M1429 Ports:
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22h Index Port
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23h Data Port
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*/
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io_sethandler(0x0022, 0x0002, ali1429_read, NULL, NULL, ali1429_write, NULL, NULL, dev);
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dev->cfg_locked = 1;
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device_add(&apm_device);
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device_add(&port_92_device);
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/* dev->smram = smram_add(); */
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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,
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ali1429_close,
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NULL,
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{NULL},
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NULL,
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NULL,
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NULL};
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