mirror of
https://github.com/86Box/86Box.git
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136 lines
3.2 KiB
C
136 lines
3.2 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 Compaq 386 memory controller.
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*
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* Authors: Miran Grca, <mgrca8@gmail.com>
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*
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* Copyright 2023 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 <string.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <math.h>
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#include <86box/86box.h>
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#include "cpu.h"
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#include <86box/io.h>
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#include <86box/timer.h>
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#include <86box/pit.h>
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#include <86box/mem.h>
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#include <86box/rom.h>
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#include <86box/device.h>
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#include <86box/keyboard.h>
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#include <86box/fdd.h>
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#include <86box/fdc.h>
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#include <86box/fdc_ext.h>
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#include <86box/hdc.h>
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#include <86box/hdc_ide.h>
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#include <86box/machine.h>
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#include <86box/video.h>
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#include <86box/vid_cga.h>
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#include <86box/vid_cga_comp.h>
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#include <86box/plat_unused.h>
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#include <86box/chipset.h>
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/* Compaq Deskpro 386 remaps RAM from 0xA0000-0xFFFFF to 0xFA0000-0xFFFFFF */
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typedef struct cpq_t {
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mem_mapping_t ram_mapping;
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} cpq_t;
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static uint8_t
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read_ram(uint32_t addr, UNUSED(void *priv))
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{
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addr = (addr & 0x7ffff) + 0x80000;
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addreadlookup(mem_logical_addr, addr);
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return (ram[addr]);
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}
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static uint16_t
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read_ramw(uint32_t addr, UNUSED(void *priv))
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{
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addr = (addr & 0x7ffff) + 0x80000;
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addreadlookup(mem_logical_addr, addr);
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return (*(uint16_t *) &ram[addr]);
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}
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static uint32_t
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read_raml(uint32_t addr, UNUSED(void *priv))
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{
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addr = (addr & 0x7ffff) + 0x80000;
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addreadlookup(mem_logical_addr, addr);
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return (*(uint32_t *) &ram[addr]);
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}
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static void
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write_ram(uint32_t addr, uint8_t val, UNUSED(void *priv))
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{
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addr = (addr & 0x7ffff) + 0x80000;
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addwritelookup(mem_logical_addr, addr);
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mem_write_ramb_page(addr, val, &pages[addr >> 12]);
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}
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static void
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write_ramw(uint32_t addr, uint16_t val, UNUSED(void *priv))
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{
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addr = (addr & 0x7ffff) + 0x80000;
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addwritelookup(mem_logical_addr, addr);
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mem_write_ramw_page(addr, val, &pages[addr >> 12]);
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}
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static void
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write_raml(uint32_t addr, uint32_t val, UNUSED(void *priv))
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{
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addr = (addr & 0x7ffff) + 0x80000;
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addwritelookup(mem_logical_addr, addr);
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mem_write_raml_page(addr, val, &pages[addr >> 12]);
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}
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static void
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compaq_close(void *priv)
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{
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cpq_t *dev = (cpq_t *) priv;
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free(dev);
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}
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static void *
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compaq_init(UNUSED(const device_t *info))
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{
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cpq_t *dev = (cpq_t *) calloc(1, sizeof(cpq_t));
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mem_remap_top(384);
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mem_mapping_add(&dev->ram_mapping, 0xfa0000, 0x60000,
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read_ram, read_ramw, read_raml,
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write_ram, write_ramw, write_raml,
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0xa0000 + ram, MEM_MAPPING_INTERNAL, NULL);
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return dev;
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}
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const device_t compaq_device = {
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.name = "Compaq Memory Control",
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.internal_name = "compaq",
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.flags = 0,
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.local = 0,
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.init = compaq_init,
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.close = compaq_close,
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.reset = NULL,
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.available = NULL,
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.speed_changed = NULL,
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.force_redraw = NULL,
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.config = NULL
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};
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