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6141dbfe0a
Serial and parallel devices created with -device are not reported in
the PIIX4 configuration space, and are hence not picked up by the DSDT.
This upsets Windows, which hides them altogether from the guest.
To avoid this, check at the end of machine initialization whether the
corresponding I/O ports have been registered. The new function in
ioport.c does this; this also requires a tweak to isa_unassign_ioport.
I left the comment in piix4_pm_initfn since the registers I moved do
seem to match the 82371AB datasheet. There are some quirks though.
We are setting this bit:
"Device 8 EIO Enable (EIO_EN_DEV8)—R/W. 1=Enable PCI access to the
device 8 enabled I/O ranges to be claimed by PIIX4 and forwarded
to the ISA/EIO bus. 0=Disable. The LPT_MON_EN must be set to enable
the decode."
but not LPT_MON_EN (bit 18 at 50h):
LPT Port Enable (LPT_MON_EN)—R/W. 1=Enable accesses to parallel
port address range (LPT_DEC_SEL) to generate a device 8 (parallel
port) decode event. 0=Disable.
We're also setting the LPT_DEC_SEL field (that's the 0x60 written to
63h) to 11, which means reserved, rather than to 01 (378h-37Fh).
Likewise we're not setting SA_MON_EN, SB_MON_EN (respectively bit 14
and bit 16 at address 50h) for the serial ports. However, we're setting
COMA_DEC_SEL and COMB_DEC_SEL correctly, unlike the corresponding register
for the parallel port.
All these fields are left as they are, since they are probably only
meant to be used in the DSDT.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/*
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* defines ioport related functions
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/**************************************************************************
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* IO ports API
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*/
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#ifndef IOPORT_H
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#define IOPORT_H
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#include "qemu-common.h"
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#include "iorange.h"
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typedef uint32_t pio_addr_t;
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#define FMT_pioaddr PRIx32
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#define MAX_IOPORTS (64 * 1024)
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#define IOPORTS_MASK (MAX_IOPORTS - 1)
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/* These should really be in isa.h, but are here to make pc.h happy. */
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typedef void (IOPortWriteFunc)(void *opaque, uint32_t address, uint32_t data);
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typedef uint32_t (IOPortReadFunc)(void *opaque, uint32_t address);
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void ioport_register(IORange *iorange);
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int register_ioport_read(pio_addr_t start, int length, int size,
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IOPortReadFunc *func, void *opaque);
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int register_ioport_write(pio_addr_t start, int length, int size,
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IOPortWriteFunc *func, void *opaque);
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void isa_unassign_ioport(pio_addr_t start, int length);
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bool isa_is_ioport_assigned(pio_addr_t start);
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void cpu_outb(pio_addr_t addr, uint8_t val);
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void cpu_outw(pio_addr_t addr, uint16_t val);
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void cpu_outl(pio_addr_t addr, uint32_t val);
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uint8_t cpu_inb(pio_addr_t addr);
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uint16_t cpu_inw(pio_addr_t addr);
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uint32_t cpu_inl(pio_addr_t addr);
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#endif /* IOPORT_H */
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