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86Box/src/chipset/ali1541.c

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/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* Implementation of the ALi M1541/2 CPU-to-PCI Bridge.
*
*
*
* Authors: Miran Grca, <mgrca8@gmail.com>
*
* Copyright 2021 Miran Grca.
*/
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#define HAVE_STDARG_H
#include <86box/86box.h>
#include <86box/timer.h>
#include <86box/device.h>
#include <86box/io.h>
#include <86box/mem.h>
#include <86box/pci.h>
#include <86box/plat_unused.h>
#include <86box/smram.h>
#include <86box/spd.h>
#include <86box/chipset.h>
typedef struct ali1541_t {
uint8_t pci_slot;
uint8_t pad;
uint8_t pad0;
uint8_t pad1;
uint8_t pci_conf[256];
smram_t *smram;
void *agp_bridge;
} ali1541_t;
#ifdef ENABLE_ALI1541_LOG
int ali1541_do_log = ENABLE_ALI1541_LOG;
static void
ali1541_log(const char *fmt, ...)
{
va_list ap;
if (ali1541_do_log) {
va_start(ap, fmt);
pclog_ex(fmt, ap);
va_end(ap);
}
}
#else
# define ali1541_log(fmt, ...)
#endif
static void
ali1541_smram_recalc(uint8_t val, ali1541_t *dev)
{
smram_disable_all();
if (val & 1) {
switch (val & 0x0c) {
case 0x00:
ali1541_log("SMRAM: D0000 -> B0000 (%i)\n", val & 2);
smram_enable(dev->smram, 0xd0000, 0xb0000, 0x10000, val & 2, 1);
if (val & 0x10)
mem_set_mem_state_smram_ex(1, 0xd0000, 0x10000, 0x02);
break;
case 0x04:
ali1541_log("SMRAM: A0000 -> A0000 (%i)\n", val & 2);
smram_enable(dev->smram, 0xa0000, 0xa0000, 0x20000, val & 2, 1);
if (val & 0x10)
mem_set_mem_state_smram_ex(1, 0xa0000, 0x20000, 0x02);
break;
case 0x08:
ali1541_log("SMRAM: 30000 -> B0000 (%i)\n", val & 2);
smram_enable(dev->smram, 0x30000, 0xb0000, 0x10000, val & 2, 1);
if (val & 0x10)
mem_set_mem_state_smram_ex(1, 0x30000, 0x10000, 0x02);
break;
default:
break;
}
}
flushmmucache_nopc();
}
static void
ali1541_shadow_recalc(UNUSED(int cur_reg), ali1541_t *dev)
{
int bit;
int r_reg;
int w_reg;
uint32_t base;
uint32_t flags = 0;
shadowbios = shadowbios_write = 0;
for (uint8_t i = 0; i < 16; i++) {
base = 0x000c0000 + (i << 14);
bit = i & 7;
r_reg = 0x56 + (i >> 3);
w_reg = 0x58 + (i >> 3);
flags = (dev->pci_conf[r_reg] & (1 << bit)) ? MEM_READ_INTERNAL : MEM_READ_EXTANY;
flags |= ((dev->pci_conf[w_reg] & (1 << bit)) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY);
if (base >= 0x000e0000) {
if (dev->pci_conf[r_reg] & (1 << bit))
shadowbios |= 1;
if (dev->pci_conf[w_reg] & (1 << bit))
shadowbios_write |= 1;
}
ali1541_log("%08X-%08X shadow: R%c, W%c\n", base, base + 0x00003fff,
(dev->pci_conf[r_reg] & (1 << bit)) ? 'I' : 'E', (dev->pci_conf[w_reg] & (1 << bit)) ? 'I' : 'E');
mem_set_mem_state_both(base, 0x00004000, flags);
}
flushmmucache_nopc();
}
static void
ali1541_mask_bar(ali1541_t *dev)
{
uint32_t bar;
uint32_t mask;
switch (dev->pci_conf[0xbc] & 0x0f) {
default:
case 0x00:
mask = 0x00000000;
break;
case 0x01:
mask = 0xfff00000;
break;
case 0x02:
mask = 0xffe00000;
break;
case 0x03:
mask = 0xffc00000;
break;
case 0x04:
mask = 0xff800000;
break;
case 0x06:
mask = 0xff000000;
break;
case 0x07:
mask = 0xfe000000;
break;
case 0x08:
mask = 0xfc000000;
break;
case 0x09:
mask = 0xf8000000;
break;
case 0x0a:
mask = 0xf0000000;
break;
}
bar = ((dev->pci_conf[0x13] << 24) | (dev->pci_conf[0x12] << 16)) & mask;
dev->pci_conf[0x12] = (bar >> 16) & 0xff;
dev->pci_conf[0x13] = (bar >> 24) & 0xff;
}
static void
ali1541_write(UNUSED(int func), int addr, uint8_t val, void *priv)
{
ali1541_t *dev = (ali1541_t *) priv;
switch (addr) {
case 0x04:
dev->pci_conf[addr] = val;
break;
case 0x05:
dev->pci_conf[addr] = val & 0x01;
break;
case 0x07:
dev->pci_conf[addr] &= ~(val & 0xf8);
break;
case 0x0d:
dev->pci_conf[addr] = val & 0xf8;
break;
case 0x12:
dev->pci_conf[0x12] = (val & 0xc0);
ali1541_mask_bar(dev);
break;
case 0x13:
dev->pci_conf[0x13] = val;
ali1541_mask_bar(dev);
break;
case 0x2c: /* Subsystem Vendor ID */
case 0x2d:
case 0x2e:
case 0x2f:
if (dev->pci_conf[0x90] & 0x01)
dev->pci_conf[addr] = val;
break;
case 0x34:
if (dev->pci_conf[0x90] & 0x02)
dev->pci_conf[addr] = val;
break;
case 0x40:
dev->pci_conf[addr] = val & 0x7f;
break;
case 0x41:
dev->pci_conf[addr] = val & 0x7f;
break;
case 0x42: /* L2 Cache */
dev->pci_conf[addr] = val;
cpu_cache_ext_enabled = !!(val & 1);
cpu_update_waitstates();
break;
case 0x43: /* PLCTL-Pipe Line Control */
dev->pci_conf[addr] = val & 0xf7;
break;
case 0x44:
dev->pci_conf[addr] = val;
break;
case 0x45:
dev->pci_conf[addr] = val;
break;
case 0x46:
dev->pci_conf[addr] = val & 0xf0;
break;
case 0x47:
dev->pci_conf[addr] = val;
break;
case 0x48:
dev->pci_conf[addr] = val;
break;
case 0x49:
dev->pci_conf[addr] = val;
break;
case 0x4a:
dev->pci_conf[addr] = val & 0xf8;
break;
case 0x4b:
dev->pci_conf[addr] = val;
break;
case 0x4c:
dev->pci_conf[addr] = val;
break;
case 0x4d:
dev->pci_conf[addr] = val;
break;
case 0x4e:
dev->pci_conf[addr] = val;
break;
case 0x4f:
dev->pci_conf[addr] = val;
break;
case 0x50:
dev->pci_conf[addr] = val & 0x71;
break;
case 0x51:
dev->pci_conf[addr] = val;
break;
case 0x52:
dev->pci_conf[addr] = val;
break;
case 0x53:
dev->pci_conf[addr] = val;
break;
case 0x54:
dev->pci_conf[addr] = val & 0x3c;
if (mem_size > 0xe00000)
mem_set_mem_state_both(0xe00000, 0x100000, (val & 0x20) ? (MEM_READ_EXTANY | MEM_WRITE_EXTANY) : (MEM_READ_INTERNAL | MEM_WRITE_INTERNAL));
if (mem_size > 0xf00000)
mem_set_mem_state_both(0xf00000, 0x100000, (val & 0x10) ? (MEM_READ_EXTANY | MEM_WRITE_EXTANY) : (MEM_READ_INTERNAL | MEM_WRITE_INTERNAL));
mem_set_mem_state_both(0xa0000, 0x20000, (val & 8) ? (MEM_READ_INTERNAL | MEM_WRITE_INTERNAL) : (MEM_READ_EXTANY | MEM_WRITE_EXTANY));
mem_set_mem_state_both(0x80000, 0x20000, (val & 4) ? (MEM_READ_EXTANY | MEM_WRITE_EXTANY) : (MEM_READ_INTERNAL | MEM_WRITE_INTERNAL));
flushmmucache_nopc();
break;
case 0x55: /* SMRAM */
dev->pci_conf[addr] = val & 0x1f;
ali1541_smram_recalc(val, dev);
break;
case 0x56 ... 0x59: /* Shadow RAM */
dev->pci_conf[addr] = val;
ali1541_shadow_recalc(val, dev);
break;
case 0x5a:
case 0x5b:
dev->pci_conf[addr] = val;
break;
case 0x5c:
dev->pci_conf[addr] = val;
break;
case 0x5d:
dev->pci_conf[addr] = val & 0x17;
break;
case 0x5e:
dev->pci_conf[addr] = val;
break;
case 0x5f:
dev->pci_conf[addr] = val & 0xc1;
break;
case 0x60 ... 0x6f: /* DRB's */
dev->pci_conf[addr] = val;
spd_write_drbs_interleaved(dev->pci_conf, 0x60, 0x6f, 1);
break;
case 0x70:
dev->pci_conf[addr] = val;
break;
case 0x71:
dev->pci_conf[addr] = val;
break;
case 0x72:
dev->pci_conf[addr] = val & 0xc7;
break;
case 0x73:
dev->pci_conf[addr] = val & 0x1f;
break;
case 0x84:
case 0x85:
dev->pci_conf[addr] = val;
break;
case 0x86:
dev->pci_conf[addr] = val & 0x0f;
break;
case 0x87: /* H2PO */
dev->pci_conf[addr] = val;
/* Find where the Shut-down Special cycle is initiated. */
#if 0
if (!(val & 0x20))
outb(0x92, 0x01);
#endif
break;
case 0x88:
dev->pci_conf[addr] = val;
break;
case 0x89:
dev->pci_conf[addr] = val;
break;
case 0x8a:
dev->pci_conf[addr] = val;
break;
case 0x8b:
dev->pci_conf[addr] = val & 0x3f;
break;
case 0x8c:
dev->pci_conf[addr] = val;
break;
case 0x8d:
dev->pci_conf[addr] = val;
break;
case 0x8e:
dev->pci_conf[addr] = val;
break;
case 0x8f:
dev->pci_conf[addr] = val;
break;
case 0x90:
dev->pci_conf[addr] = val;
pci_bridge_set_ctl(dev->agp_bridge, val);
break;
case 0x91:
dev->pci_conf[addr] = val;
break;
case 0xb4:
if (dev->pci_conf[0x90] & 0x01)
dev->pci_conf[addr] = val & 0x03;
break;
case 0xb5:
if (dev->pci_conf[0x90] & 0x01)
dev->pci_conf[addr] = val & 0x02;
break;
case 0xb7:
if (dev->pci_conf[0x90] & 0x01)
dev->pci_conf[addr] = val;
break;
case 0xb8:
dev->pci_conf[addr] = val & 0x03;
break;
case 0xb9:
dev->pci_conf[addr] = val & 0x03;
break;
case 0xbb:
dev->pci_conf[addr] = val;
break;
case 0xbc:
dev->pci_conf[addr] = val & 0x0f;
ali1541_mask_bar(dev);
break;
case 0xbd:
dev->pci_conf[addr] = val & 0xf0;
break;
case 0xbe:
case 0xbf:
dev->pci_conf[addr] = val;
break;
case 0xc0:
dev->pci_conf[addr] = val & 0x90;
break;
case 0xc1:
case 0xc2:
case 0xc3:
dev->pci_conf[addr] = val;
break;
case 0xc8:
case 0xc9:
dev->pci_conf[addr] = val;
break;
case 0xd1:
dev->pci_conf[addr] = val & 0xf1;
break;
case 0xd2:
case 0xd3:
dev->pci_conf[addr] = val;
break;
case 0xe0:
case 0xe1:
if (dev->pci_conf[0x90] & 0x20)
dev->pci_conf[addr] = val;
break;
case 0xe2:
if (dev->pci_conf[0x90] & 0x20)
dev->pci_conf[addr] = val & 0x3f;
break;
case 0xe3:
if (dev->pci_conf[0x90] & 0x20)
dev->pci_conf[addr] = val & 0xfe;
break;
case 0xe4:
if (dev->pci_conf[0x90] & 0x20)
dev->pci_conf[addr] = val & 0x03;
break;
case 0xe5:
if (dev->pci_conf[0x90] & 0x20)
dev->pci_conf[addr] = val;
break;
case 0xe6:
if (dev->pci_conf[0x90] & 0x20)
dev->pci_conf[addr] = val & 0xc0;
break;
case 0xe7:
if (dev->pci_conf[0x90] & 0x20)
dev->pci_conf[addr] = val;
break;
case 0xe8:
case 0xe9:
if (dev->pci_conf[0x90] & 0x04)
dev->pci_conf[addr] = val;
break;
case 0xea:
dev->pci_conf[addr] = val & 0xcf;
break;
case 0xeb:
dev->pci_conf[addr] = val & 0xcf;
break;
case 0xec:
dev->pci_conf[addr] = val & 0x3f;
break;
case 0xed:
dev->pci_conf[addr] = val;
break;
case 0xee:
dev->pci_conf[addr] = val & 0x3e;
break;
case 0xef:
dev->pci_conf[addr] = val;
break;
case 0xf3:
dev->pci_conf[addr] = val & 0x08;
break;
case 0xf5:
dev->pci_conf[addr] = val;
break;
case 0xf6:
dev->pci_conf[addr] = val;
break;
case 0xf7:
dev->pci_conf[addr] = val & 0x43;
break;
default:
break;
}
}
static uint8_t
ali1541_read(UNUSED(int func), int addr, void *priv)
{
const ali1541_t *dev = (ali1541_t *) priv;
uint8_t ret = 0xff;
ret = dev->pci_conf[addr];
return ret;
}
static void
ali1541_reset(void *priv)
{
ali1541_t *dev = (ali1541_t *) priv;
/* Default Registers */
dev->pci_conf[0x00] = 0xb9;
dev->pci_conf[0x01] = 0x10;
dev->pci_conf[0x02] = 0x41;
dev->pci_conf[0x03] = 0x15;
dev->pci_conf[0x04] = 0x06;
dev->pci_conf[0x05] = 0x00;
dev->pci_conf[0x06] = 0x10;
dev->pci_conf[0x07] = 0x04;
dev->pci_conf[0x08] = 0x00;
dev->pci_conf[0x09] = 0x00;
dev->pci_conf[0x0a] = 0x00;
dev->pci_conf[0x0b] = 0x06;
dev->pci_conf[0x0c] = 0x00;
dev->pci_conf[0x0d] = 0x20;
dev->pci_conf[0x0e] = 0x00;
dev->pci_conf[0x0f] = 0x00;
dev->pci_conf[0x2c] = 0xb9;
dev->pci_conf[0x2d] = 0x10;
dev->pci_conf[0x2e] = 0x41;
dev->pci_conf[0x2f] = 0x15;
dev->pci_conf[0x34] = 0xb0;
dev->pci_conf[0x89] = 0x20;
dev->pci_conf[0x8a] = 0x20;
dev->pci_conf[0x91] = 0x13;
dev->pci_conf[0xb0] = 0x02;
dev->pci_conf[0xb1] = 0xe0;
dev->pci_conf[0xb2] = 0x10;
dev->pci_conf[0xb4] = 0x03;
dev->pci_conf[0xb5] = 0x02;
dev->pci_conf[0xb7] = 0x1c;
dev->pci_conf[0xc8] = 0xbf;
dev->pci_conf[0xc9] = 0x0a;
dev->pci_conf[0xe0] = 0x01;
cpu_cache_int_enabled = 1;
ali1541_write(0, 0x42, 0x00, dev);
ali1541_write(0, 0x54, 0x00, dev);
ali1541_write(0, 0x55, 0x00, dev);
for (uint8_t i = 0; i < 4; i++)
ali1541_write(0, 0x56 + i, 0x00, dev);
ali1541_write(0, 0x60, 0x07, dev);
ali1541_write(0, 0x61, 0x40, dev);
for (uint8_t i = 0; i < 14; i += 2) {
ali1541_write(0, 0x62 + i, 0x00, dev);
ali1541_write(0, 0x63 + i, 0x00, dev);
}
}
static void
ali1541_close(void *priv)
{
ali1541_t *dev = (ali1541_t *) priv;
smram_del(dev->smram);
free(dev);
}
static void *
ali1541_init(UNUSED(const device_t *info))
{
ali1541_t *dev = (ali1541_t *) malloc(sizeof(ali1541_t));
memset(dev, 0, sizeof(ali1541_t));
pci_add_card(PCI_ADD_NORTHBRIDGE, ali1541_read, ali1541_write, dev, &dev->pci_slot);
dev->smram = smram_add();
ali1541_reset(dev);
dev->agp_bridge = device_add(&ali5243_agp_device);
return dev;
}
const device_t ali1541_device = {
.name = "ALi M1541 CPU-to-PCI Bridge",
.internal_name = "ali1541",
.flags = DEVICE_PCI,
.local = 0,
.init = ali1541_init,
.close = ali1541_close,
.reset = ali1541_reset,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};
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