242 lines
6.0 KiB
C
242 lines
6.0 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 UMC 8890 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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* Miran Grca, <mgrca8@gmail.com>
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*
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* Copyright 2021 Tiseno100.
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* Copyright 2021-2024 Miran Grca.
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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/pci.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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#ifdef ENABLE_UMC_8890_LOG
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int umc_8890_do_log = ENABLE_UMC_8890_LOG;
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static void
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umc_8890_log(const char *fmt, ...)
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{
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va_list ap;
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if (umc_8890_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 umc_8890_log(fmt, ...)
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#endif
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typedef struct umc_8890_t {
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uint8_t pci_slot;
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uint8_t pci_conf[256]; /* PCI Registers */
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int mem_state[2];
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uint32_t smram_base;
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smram_t *smram; /* SMRAM Handler */
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} umc_8890_t;
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static void
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um8890_shadow(umc_8890_t *dev)
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{
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uint8_t flag;
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uint16_t state;
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flag = (dev->pci_conf[0x5f] & 0x0c) >> 2;
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state = (flag & 1) ? (MEM_READ_INTERNAL | ((flag & 2) ? MEM_WRITE_DISABLED : MEM_WRITE_INTERNAL)) :
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(MEM_READ_EXTANY | MEM_WRITE_EXTANY);
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if ((dev->mem_state[1] ^ dev->pci_conf[0x5f]) & 0x0c) {
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mem_set_mem_state_both(0xe0000, 0x10000, state);
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dev->mem_state[1] = (dev->mem_state[1] & 0xf0) | (dev->pci_conf[0x5f] & 0x0f);
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}
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flag = (dev->pci_conf[0x5f] & 0xc0) >> 6;
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state = (flag & 1) ? (MEM_READ_INTERNAL | ((flag & 2) ? MEM_WRITE_DISABLED : MEM_WRITE_INTERNAL)) :
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(MEM_READ_EXTANY | MEM_WRITE_EXTANY);
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if ((dev->mem_state[1] ^ dev->pci_conf[0x5f]) & 0xc0) {
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mem_set_mem_state_both(0xf0000, 0x10000, state);
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dev->mem_state[1] = (dev->mem_state[1] & 0x0f) | (dev->pci_conf[0x5f] & 0xf0);
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}
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for (uint8_t i = 0; i < 8; i++) {
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state = (dev->pci_conf[0x5d] & (1 << i)) ? (MEM_READ_INTERNAL | MEM_WRITE_INTERNAL) :
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(MEM_READ_EXTANY | MEM_WRITE_EXTANY);
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if ((dev->mem_state[0] ^ dev->pci_conf[0x5d]) & (1 << i)) {
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mem_set_mem_state_both(0xc0000 + (i << 14), 0x4000, state);
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dev->mem_state[0] = (dev->mem_state[0] & ~(1 << i)) | (dev->pci_conf[0x5d] & (1 << i));
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}
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}
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flushmmucache_nopc();
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}
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static void
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um8890_smram(umc_8890_t *dev)
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{
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smram_disable_all();
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/* Bit 4, if set, enables SMRAM access outside SMM. SMRAM appears to be always enabled
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in SMM, and is always set to A0000-BFFFF. */
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smram_enable(dev->smram, 0x000a0000, 0x000a0000, 0x20000, dev->pci_conf[0x65] & 0x10, 1);
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}
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static void
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um8890_write(int func, int addr, uint8_t val, void *priv)
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{
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umc_8890_t *dev = (umc_8890_t *)priv;
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if (func == 0) switch (addr) {
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case 0x04 ... 0x05:
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case 0x0c ... 0x0d:
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case 0x40 ... 0x5b:
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case 0x60 ... 0x63:
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case 0x66 ... 0xff:
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dev->pci_conf[addr] = val;
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break;
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case 0x07:
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dev->pci_conf[addr] &= ~(val & 0xf9);
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break;
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case 0x5c ... 0x5f:
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dev->pci_conf[addr] = val;
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um8890_shadow(dev);
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break;
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/* Register 64h, 16-bit:
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Bit 12: SMRAM enabled outside SMM (1 = yes, 0 = no);
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Bit 10: ???? (set by Award BIOS);
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Bits 7- 0: SMM handler offset to SMBASE, shifted to the right by 14.
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*/
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case 0x64: case 0x65:
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dev->pci_conf[addr] = val;
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if (addr == 0x65)
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um8890_smram(dev);
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break;
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}
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umc_8890_log("UM8890: dev->regs[%02x] = %02x POST: %02x\n", addr, dev->pci_conf[addr], inb(0x80));
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}
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static uint8_t
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um8890_read(int func, int addr, void *priv)
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{
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umc_8890_t *dev = (umc_8890_t *)priv;
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uint8_t ret = 0xff;
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if (func == 0)
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ret = dev->pci_conf[addr];
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return ret;
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}
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static void
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umc_8890_reset(void *priv)
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{
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umc_8890_t *dev = (umc_8890_t *)priv;
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memset(dev->pci_conf, 0x00, sizeof(dev->pci_conf));
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/* Defaults */
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dev->pci_conf[0x00] = 0x60; /* UMC */
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dev->pci_conf[0x01] = 0x10;
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dev->pci_conf[0x02] = 0x91; /* 8891F */
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dev->pci_conf[0x03] = 0x88;
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dev->pci_conf[0x07] = 0x02;
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dev->pci_conf[0x08] = 0x01;
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dev->pci_conf[0x09] = 0x00;
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dev->pci_conf[0x0a] = 0x00;
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dev->pci_conf[0x0b] = 0x06;
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dev->pci_conf[0x5c] = 0x00;
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dev->pci_conf[0x5d] = 0x00;
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dev->pci_conf[0x5e] = 0x00;
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dev->pci_conf[0x5f] = 0x00;
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dev->pci_conf[0x64] = 0x00;
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dev->pci_conf[0x65] = 0x00;
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um8890_shadow(dev);
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um8890_smram(dev);
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}
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static void
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umc_8890_close(void *priv)
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{
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umc_8890_t *dev = (umc_8890_t *)priv;
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smram_del(dev->smram);
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free(dev);
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}
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static void *
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umc_8890_init(const device_t *info)
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{
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umc_8890_t *dev = (umc_8890_t *) calloc(1, sizeof(umc_8890_t));
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/* Device 0: UMC 8890 */
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pci_add_card(PCI_ADD_NORTHBRIDGE, um8890_read, um8890_write, dev, &dev->pci_slot);
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/* Port 92 */
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device_add(&port_92_pci_device);
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dev->smram = smram_add();
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umc_8890_reset(dev);
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return dev;
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}
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const device_t umc_8890_device = {
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.name = "UMC 8890(8891BF/8892BF)",
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.internal_name = "umc_8890",
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.flags = DEVICE_PCI,
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.local = 0x886a,
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.init = umc_8890_init,
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.close = umc_8890_close,
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.reset = umc_8890_reset,
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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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