203 lines
5.5 KiB
C
203 lines
5.5 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 Intel 82335(KU82335) chipset.
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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/keyboard.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/chipset.h>
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/* Shadow capabilities */
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#define DISABLED_SHADOW (MEM_READ_EXTANY | MEM_WRITE_EXTANY)
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#define ENABLED_SHADOW ((LOCK_STATUS) ? RO_SHADOW : RW_SHADOW)
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#define RW_SHADOW (MEM_READ_INTERNAL | MEM_WRITE_INTERNAL)
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#define RO_SHADOW (MEM_READ_INTERNAL | MEM_WRITE_DISABLED)
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/* Granularity Register Enable & Recalc */
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#define EXTENDED_GRANULARITY_ENABLED (dev->regs[0x2c] & 0x01)
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#define GRANULARITY_RECALC ((dev->regs[0x2e] & (1 << (i+8))) ? ((dev->regs[0x2e] & (1 << i)) ? RO_SHADOW : RW_SHADOW) : DISABLED_SHADOW)
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/* R/W operator for the Video RAM region */
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#define DETERMINE_VIDEO_RAM_WRITE_ACCESS ((dev->regs[0x22] & (0x08 << 8)) ? RW_SHADOW : RO_SHADOW)
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/* Base System 512/640KB switch */
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#define ENABLE_TOP_128KB (MEM_READ_INTERNAL | MEM_WRITE_INTERNAL)
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#define DISABLE_TOP_128KB (MEM_READ_EXTANY | MEM_WRITE_EXTANY)
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/* ROM size determination */
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#define ROM_SIZE ((dev->regs[0x22] & (0x01 << 8)) ? 0xe0000 : 0xf0000)
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/* Lock status */
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#define LOCK_STATUS (dev->regs[0x22] & (0x80 << 8))
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typedef struct
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{
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uint16_t regs[256],
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cfg_locked;
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} intel_82335_t;
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#ifdef ENABLE_INTEL_82335_LOG
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int intel_82335_do_log = ENABLE_INTEL_82335_LOG;
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static void
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intel_82335_log(const char *fmt, ...)
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{
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va_list ap;
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if (intel_82335_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 intel_82335_log(fmt, ...)
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#endif
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static void
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intel_82335_write(uint16_t addr, uint16_t val, void *priv)
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{
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intel_82335_t *dev = (intel_82335_t *) priv;
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uint32_t romsize = 0, base = 0, i = 0;
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dev->regs[addr] = val;
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if(!dev->cfg_locked)
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{
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intel_82335_log("Register %02x: Write %04x\n", addr, val);
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switch (addr) {
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case 0x22: /* Memory Controller */
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/* Check if the ROM chips are 256 or 512Kbit (Just for Shadowing sanity) */
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romsize = ROM_SIZE;
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if (!EXTENDED_GRANULARITY_ENABLED)
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{
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shadowbios = (dev->regs[0x22] & 0x01);
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shadowbios_write = (dev->regs[0x22] & 0x01);
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/* Base System 512/640KB set */
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mem_set_mem_state_both(0x80000, 0x20000, (dev->regs[0x22] & 0x08) ? ENABLE_TOP_128KB : DISABLE_TOP_128KB);
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/* Video RAM shadow*/
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mem_set_mem_state_both(0xa0000, 0x20000, (dev->regs[0x22] & (0x04 << 8)) ? DETERMINE_VIDEO_RAM_WRITE_ACCESS : DISABLED_SHADOW);
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/* Option ROM shadow */
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mem_set_mem_state_both(0xc0000, 0x20000, (dev->regs[0x22] & (0x02 << 8)) ? ENABLED_SHADOW : DISABLED_SHADOW);
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/* System ROM shadow */
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mem_set_mem_state_both(0xe0000, 0x20000, (dev->regs[0x22] & 0x01) ? ENABLED_SHADOW : DISABLED_SHADOW);
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}
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break;
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case 0x2e: /* Extended Granularity (Enabled if Bit 0 in Register 2Ch is set) */
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if(EXTENDED_GRANULARITY_ENABLED)
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{
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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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shadowbios = (dev->regs[0x2e] & (1 << (i+8))) && (base == romsize);
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shadowbios_write = (dev->regs[0x2e] & (1 << i)) && (base == romsize);
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mem_set_mem_state_both(base, 0x8000, GRANULARITY_RECALC);
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}
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break;
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}
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}
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}
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/* Unlock/Lock configuration registers */
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dev->cfg_locked = LOCK_STATUS;
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}
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static uint16_t
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intel_82335_read(uint16_t addr, void *priv)
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{
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intel_82335_t *dev = (intel_82335_t *) priv;
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intel_82335_log("Register %02x: Read %04x\n", addr, dev->regs[addr]);
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return dev->regs[addr];
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}
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static void
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intel_82335_close(void *priv)
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{
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intel_82335_t *dev = (intel_82335_t *) priv;
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free(dev);
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}
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static void *
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intel_82335_init(const device_t *info)
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{
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intel_82335_t *dev = (intel_82335_t *) malloc(sizeof(intel_82335_t));
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memset(dev, 0, sizeof(intel_82335_t));
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dev->cfg_locked = 0;
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/* Memory Configuration */
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io_sethandler(0x0022, 0x0001, NULL, intel_82335_read, NULL, NULL, intel_82335_write, NULL, dev);
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/* Roll Comparison */
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io_sethandler(0x0024, 0x0001, NULL, intel_82335_read, NULL, NULL, intel_82335_write, NULL, dev);
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io_sethandler(0x0026, 0x0001, NULL, intel_82335_read, NULL, NULL, intel_82335_write, NULL, dev);
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/* Address Range Comparison */
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io_sethandler(0x0028, 0x0001, NULL, intel_82335_read, NULL, NULL, intel_82335_write, NULL, dev);
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io_sethandler(0x002a, 0x0001, NULL, intel_82335_read, NULL, NULL, intel_82335_write, NULL, dev);
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/* Granularity Enable */
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io_sethandler(0x002c, 0x0001, NULL, intel_82335_read, NULL, NULL, intel_82335_write, NULL, dev);
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/* Extended Granularity */
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io_sethandler(0x002e, 0x0001, NULL, intel_82335_read, NULL, NULL, intel_82335_write, NULL, dev);
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/* Default Programming(Fixes Shadowing failures on the ADI 386SX) */
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for(uint16_t i=0x0022; i<0x002f; i=i+0x0002)
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intel_82335_write(i, 0x0000, dev);
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intel_82335_write(0x0028, 0x00f9, dev);
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return dev;
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}
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const device_t intel_82335_device = {
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"Intel 82335",
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0,
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0,
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intel_82335_init, intel_82335_close, NULL,
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NULL, NULL, NULL,
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NULL
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};
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