Files
86Box/src/chipset/umc_hb4.c

412 lines
10 KiB
C

/*
* 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 UMC HB4 "Super Energy Star Green" PCI Chipset.
*
* Note: This chipset has no datasheet, everything were done via
* reverse engineering the BIOS of various machines using it.
*
* Note 2: Additional information were also used from all
* around the web.
*
*
*
* Authors: Tiseno100,
* Miran Grca, <mgrca8@gmail.com>
*
* Copyright 2021 Tiseno100.
* Copyright 2021 Miran Grca.
*/
/*
UMC HB4 Configuration Registers
Sources & Notes:
Cache registers were found at Vogons: https://www.vogons.org/viewtopic.php?f=46&t=68829&start=20
Basic Reverse engineering effort was done personally by me
Warning: Register documentation may be inaccurate!
UMC 8881x:
Register 50:
Bit 7: Enable L2 Cache
Bit 6: Cache Policy (0: Write Thru / 1: Write Back)
Bit 5-4 Cache Speed
0 0 Read 3-2-2-2 Write 3T
0 1 Read 3-1-1-1 Write 3T
1 0 Read 2-2-2-2 Write 2T
1 1 Read 2-1-1-1 Write 2T
Bit 3 Cache Banks (0: 1 Bank / 1: 2 Banks)
Bit 2-1-0 Cache Size
0 0 0 0KB
0 0 1 64KB
x-x-x Multiplications of 2(64*2 for 0 1 0) till 2MB
Register 51:
Bit 7-6 DRAM Read Speed
5-4 DRAM Write Speed
0 0 1 Waits
0 1 1 Waits
1 0 1 Wait
1 1 0 Waits
Bit 3 Resource Lock Enable
Bit 2 Graphics Adapter (0: VL Bus / 1: PCI Bus)
Bit 1 L1 WB Policy (0: WT / 1: WB)
Bit 0 L2 Cache Tag Lenght (0: 7 Bits / 1: 8 Bits)
Register 52:
Bit 7: Host-to-PCI Post Write (0: 1 Wait State / 1: 0 Wait States)
Register 54:
Bit 7: DC000-DFFFF Read Enable
Bit 6: D8000-DBFFF Read Enable
Bit 5: D4000-D7FFF Read Enable
Bit 4: D0000-D3FFF Read Enable
Bit 3: CC000-CFFFF Read Enable
Bit 2: C8000-CBFFF Read Enable
Bit 1: C0000-C7FFF Read Enable
Bit 0: Enable C0000-DFFFF Shadow Segment Bits
Register 55:
Bit 7: E0000-FFFF Read Enable
Bit 6: Shadow Write Status (1: Write Protect/0: Write)
Register 56h & 57h: DRAM Bank 0 Configuration
Register 58h & 59h: DRAM Bank 1 Configuration
Register 60:
Bit 5: If set and SMRAM is enabled, data cycles go to PCI and code cycles go to DRAM
Bit 0: SMRAM Local Access Enable - if set, SMRAM is also enabled outside SMM
SMRAM appears to always be enabled in SMM, and always set to A0000-BFFFF.
*/
#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 "cpu.h"
#include "x86.h"
#include <86box/timer.h>
#include <86box/io.h>
#include <86box/device.h>
#include <86box/mem.h>
#include <86box/pci.h>
#include <86box/plat_unused.h>
#include <86box/port_92.h>
#include <86box/smram.h>
#include <86box/chipset.h>
#ifdef ENABLE_HB4_LOG
int hb4_do_log = ENABLE_HB4_LOG;
static void
hb4_log(const char *fmt, ...)
{
va_list ap;
if (hb4_do_log) {
va_start(ap, fmt);
pclog_ex(fmt, ap);
va_end(ap);
}
}
#else
# define hb4_log(fmt, ...)
#endif
typedef struct hb4_t {
uint8_t shadow;
uint8_t shadow_read;
uint8_t shadow_write;
uint8_t pci_slot;
uint8_t pci_conf[256]; /* PCI Registers */
int mem_state[9];
smram_t *smram[3]; /* SMRAM Handlers */
} hb4_t;
static int shadow_bios[4] = { (MEM_READ_EXTANY | MEM_WRITE_INTERNAL), (MEM_READ_EXTANY | MEM_WRITE_EXTANY),
(MEM_READ_INTERNAL | MEM_WRITE_INTERNAL), (MEM_READ_INTERNAL | MEM_WRITE_EXTANY) };
static int shadow_read[2] = { MEM_READ_EXTANY, MEM_READ_INTERNAL };
static int shadow_write[2] = { MEM_WRITE_INTERNAL, MEM_WRITE_EXTANY };
int
hb4_shadow_bios_high(hb4_t *dev)
{
int state;
state = shadow_bios[dev->pci_conf[0x55] >> 6];
if (state != dev->mem_state[8]) {
mem_set_mem_state_both(0xf0000, 0x10000, state);
if ((dev->mem_state[8] & MEM_READ_INTERNAL) && !(state & MEM_READ_INTERNAL))
mem_invalidate_range(0xf0000, 0xfffff);
dev->mem_state[8] = state;
return 1;
}
return 0;
}
int
hb4_shadow_bios_low(hb4_t *dev)
{
int state;
state = shadow_bios[(dev->pci_conf[0x55] >> 6) & (dev->shadow | 0x01)];
if (state != dev->mem_state[7]) {
mem_set_mem_state_both(0xe0000, 0x10000, state);
dev->mem_state[7] = state;
return 1;
}
return 0;
}
int
hb4_shadow_main(hb4_t *dev)
{
int state;
int n = 0;
for (uint8_t i = 0; i < 6; i++) {
state = shadow_read[dev->shadow && ((dev->pci_conf[0x54] >> (i + 2)) & 0x01)] | shadow_write[(dev->pci_conf[0x55] >> 6) & 0x01];
if (state != dev->mem_state[i + 1]) {
n++;
mem_set_mem_state_both(0xc8000 + (i << 14), 0x4000, state);
dev->mem_state[i + 1] = state;
}
}
return n;
}
int
hb4_shadow_video(hb4_t *dev)
{
int state;
state = shadow_read[dev->shadow && ((dev->pci_conf[0x54] >> 1) & 0x01)] | shadow_write[(dev->pci_conf[0x55] >> 6) & 0x01];
if (state != dev->mem_state[0]) {
mem_set_mem_state_both(0xc0000, 0x8000, state);
dev->mem_state[0] = state;
return 1;
}
return 0;
}
void
hb4_shadow(hb4_t *dev)
{
int n = 0;
hb4_log("SHADOW: %02X%02X\n", dev->pci_conf[0x55], dev->pci_conf[0x54]);
n = hb4_shadow_bios_high(dev);
n += hb4_shadow_bios_low(dev);
n += hb4_shadow_main(dev);
n += hb4_shadow_video(dev);
if (n > 0)
flushmmucache_nopc();
}
static void
hb4_smram(hb4_t *dev)
{
smram_disable_all();
/* Bit 0, if set, enables SMRAM access outside SMM. SMRAM appears to be always enabled
in SMM, and is always set to A0000-BFFFF. */
smram_enable(dev->smram[0], 0x000a0000, 0x000a0000, 0x20000, dev->pci_conf[0x60] & 0x01, 1);
/* There's a mirror of the SMRAM at 0E0A0000, mapped to A0000. */
smram_enable(dev->smram[1], 0x0e0a0000, 0x000a0000, 0x20000, dev->pci_conf[0x60] & 0x01, 1);
/* There's another mirror of the SMRAM at 4E0A0000, mapped to A0000. */
smram_enable(dev->smram[2], 0x4e0a0000, 0x000a0000, 0x20000, dev->pci_conf[0x60] & 0x01, 1);
/* Bit 5 seems to set data to go to PCI and code to DRAM. The Samsung SPC7700P-LW uses
this. */
if (dev->pci_conf[0x60] & 0x20) {
if (dev->pci_conf[0x60] & 0x01)
mem_set_mem_state_smram_ex(0, 0x000a0000, 0x20000, 0x02);
mem_set_mem_state_smram_ex(1, 0x000a0000, 0x20000, 0x02);
}
}
static void
hb4_write(UNUSED(int func), int addr, uint8_t val, void *priv)
{
hb4_t *dev = (hb4_t *) priv;
hb4_log("UM8881: dev->regs[%02x] = %02x POST: %02x \n", addr, val, inb(0x80));
switch (addr) {
case 0x04:
case 0x05:
dev->pci_conf[addr] = val;
break;
case 0x07:
dev->pci_conf[addr] &= ~(val & 0xf9);
break;
case 0x0c:
case 0x0d:
dev->pci_conf[addr] = val;
break;
case 0x50:
dev->pci_conf[addr] = ((val & 0xf8) | 4); /* Hardcode Cache Size to 512KB */
cpu_cache_ext_enabled = !!(val & 0x80); /* Fixes freezing issues on the HOT-433A*/
cpu_update_waitstates();
break;
case 0x51:
case 0x52:
dev->pci_conf[addr] = val;
break;
case 0x53:
dev->pci_conf[addr] = val;
hb4_log("HB53: %02X\n", val);
break;
case 0x55:
dev->shadow_read = (val & 0x80);
dev->shadow_write = (val & 0x40);
dev->pci_conf[addr] = val;
hb4_shadow(dev);
break;
case 0x54:
dev->shadow = (val & 0x01) << 1;
dev->pci_conf[addr] = val;
hb4_shadow(dev);
break;
case 0x56 ... 0x5f:
dev->pci_conf[addr] = val;
break;
case 0x60:
dev->pci_conf[addr] = val;
hb4_smram(dev);
break;
case 0x61:
dev->pci_conf[addr] = val;
break;
default:
break;
}
}
static uint8_t
hb4_read(int func, int addr, void *priv)
{
const hb4_t *dev = (hb4_t *) priv;
uint8_t ret = 0xff;
if (func == 0)
ret = dev->pci_conf[addr];
return ret;
}
static void
hb4_reset(void *priv)
{
hb4_t *dev = (hb4_t *) priv;
memset(dev->pci_conf, 0x00, sizeof(dev->pci_conf));
dev->pci_conf[0] = 0x60; /* UMC */
dev->pci_conf[1] = 0x10;
dev->pci_conf[2] = 0x81; /* 8881x */
dev->pci_conf[3] = 0x88;
dev->pci_conf[7] = 2;
dev->pci_conf[8] = 4;
dev->pci_conf[0x09] = 0x00;
dev->pci_conf[0x0a] = 0x00;
dev->pci_conf[0x0b] = 0x06;
dev->pci_conf[0x51] = 1;
dev->pci_conf[0x52] = 1;
dev->pci_conf[0x5a] = 4;
dev->pci_conf[0x5c] = 0xc0;
dev->pci_conf[0x5d] = 0x20;
dev->pci_conf[0x5f] = 0xff;
hb4_write(0, 0x54, 0x00, dev);
hb4_write(0, 0x55, 0x00, dev);
hb4_write(0, 0x60, 0x80, dev);
cpu_cache_ext_enabled = 0;
cpu_update_waitstates();
memset(dev->mem_state, 0x00, sizeof(dev->mem_state));
}
static void
hb4_close(void *priv)
{
hb4_t *dev = (hb4_t *) priv;
free(dev);
}
static void *
hb4_init(UNUSED(const device_t *info))
{
hb4_t *dev = (hb4_t *) malloc(sizeof(hb4_t));
memset(dev, 0, sizeof(hb4_t));
pci_add_card(PCI_ADD_NORTHBRIDGE, hb4_read, hb4_write, dev, &dev->pci_slot); /* Device 10: UMC 8881x */
/* Port 92 */
device_add(&port_92_pci_device);
/* SMRAM */
dev->smram[0] = smram_add();
dev->smram[1] = smram_add();
dev->smram[2] = smram_add();
hb4_reset(dev);
return dev;
}
const device_t umc_hb4_device = {
.name = "UMC HB4(8881F)",
.internal_name = "umc_hb4",
.flags = DEVICE_PCI,
.local = 0x886a,
.init = hb4_init,
.close = hb4_close,
.reset = hb4_reset,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = NULL
};