A bit of fiddling seems to indicate that dynamically presenting the UAR
devices does actually make sense. Windows doesn't complain about all COM
ports going missing in the same way that it does about all LPT ports going
missing. And it does complain (albeit hidden in device manager and event
viewer) if it sees a ACPI UAR device that it can't physically probe.
-- Keir
On 28/8/07 11:35, "Keir Fraser" <keir@xxxxxxxxxxxxx> wrote:
> Could we just always-on a UAR2 device? We don't use IRQ 3 for anything else.
> Also we already always-on LTP1 and UAR1, and switching those off on
> already-installed guests is likely to cause Windows to get upset.
>
> Also, PIIX4 is not hardcoded to 00:01.2, and if it moves then we have set
> ourselves up here for a subtle bug.
>
> -- Keir
>
> On 27/8/07 19:46, "Ben Guthro" <bguthro@xxxxxxxxxxxxxxx> wrote:
>
>> Fix to ACPI DSDT and qemu to properly detect COM ports.
>>
>> Signed-off-by: Ben Guthro <bguthro@xxxxxxxxxxxxxxx>
>> Signed-off-by: Gary Grebus <ggrebus@xxxxxxxxxxxxxxx>
>>
>> diff -r b3ff399f3be9 tools/firmware/hvmloader/acpi/dsdt.asl
>> --- a/tools/firmware/hvmloader/acpi/dsdt.asl Mon Jul 30 15:02:51 2007 -0400
>> +++ b/tools/firmware/hvmloader/acpi/dsdt.asl Mon Jul 30 15:02:51 2007 -0400
>> @@ -635,7 +635,16 @@ DefinitionBlock ("DSDT.aml", "DSDT", 2,
>> Name (_UID, 0x01)
>> Method (_STA, 0, NotSerialized)
>> {
>> - Return (0x0F)
>> + Store (\_SB.PCI0.PX13.DRSC, Local0)
>> + And (Local0, 0x08000000, Local0)
>> + If (LEqual (Local0, 0))
>> + {
>> + Return (0x00)
>> + }
>> + Else
>> + {
>> + Return (0x0F)
>> + }
>> }
>>
>> Name (_CRS, ResourceTemplate()
>> @@ -644,7 +653,29 @@ DefinitionBlock ("DSDT.aml", "DSDT", 2,
>> IRQNoFlags () {4}
>> })
>> }
>> -
>> + Device (UAR2)
>> + {
>> + Name (_HID, EisaId ("PNP0501"))
>> + Name (_UID, 0x02)
>> + Method (_STA, 0, NotSerialized)
>> + {
>> + Store (\_SB.PCI0.PX13.DRSC, Local0)
>> + And (Local0, 0x80000000, Local0)
>> + If (LEqual (Local0, 0))
>> + {
>> + Return (0x00)
>> + }
>> + Else
>> + {
>> + Return (0x0F)
>> + }
>> + }
>> + Name (_CRS, ResourceTemplate()
>> + {
>> + IO (Decode16, 0x02F8, 0x02F8, 0x00, 0x08)
>> + IRQNoFlags () {3}
>> + })
>> + }
>> Device (LTP1)
>> {
>> Name (_HID, EisaId ("PNP0400"))
>> @@ -661,6 +692,25 @@ DefinitionBlock ("DSDT.aml", "DSDT", 2,
>> })
>> }
>> }
>> + /* PIIX4 PM */
>> + Device (PX13) {
>> + Name (_ADR, 0x00010002)
>> +
>> + OperationRegion (P13C, PCI_Config, 0x5c, 0x24)
>> + Field (P13C, DWordAcc, NoLock, Preserve)
>> + {
>> + DRSA, 32,
>> + DRSB, 32,
>> + DRSC, 32,
>> + DRSE, 32,
>> + DRSF, 32,
>> + DRSG, 32,
>> + DRSH, 32,
>> + DRSI, 32,
>> + DRSJ, 32
>> + }
>> + }
>> +
>> }
>> }
>> }
>> diff -r b3ff399f3be9 tools/firmware/hvmloader/acpi/dsdt.c
>> --- a/tools/firmware/hvmloader/acpi/dsdt.c Mon Jul 30 15:02:51 2007 -0400
>> +++ b/tools/firmware/hvmloader/acpi/dsdt.c Tue Jul 31 13:17:34 2007 -0400
>> @@ -1,22 +1,22 @@
>> /*
>> *
>> * Intel ACPI Component Architecture
>> - * ASL Optimizing Compiler version 20060707 [Feb 16 2007]
>> + * ASL Optimizing Compiler version 20060127 [Jun 16 2006]
>> * Copyright (C) 2000 - 2006 Intel Corporation
>> * Supports ACPI Specification Revision 3.0a
>> *
>> - * Compilation of "dsdt.asl" - Wed Jul 11 13:34:30 2007
>> + * Compilation of "dsdt.asl" - Tue Jul 31 11:23:43 2007
>> *
>> * C source code output
>> *
>> */
>> unsigned char AmlCode[] =
>> {
>> - 0x44,0x53,0x44,0x54,0x9F,0x0D,0x00,0x00, /* 00000000 "DSDT...." */
>> - 0x02,0x2E,0x58,0x65,0x6E,0x00,0x00,0x00, /* 00000008 "..Xen..." */
>> + 0x44,0x53,0x44,0x54,0x69,0x0E,0x00,0x00, /* 00000000 "DSDTi..." */
>> + 0x02,0x1B,0x58,0x65,0x6E,0x00,0x00,0x00, /* 00000008 "..Xen..." */
>> 0x48,0x56,0x4D,0x00,0x00,0x00,0x00,0x00, /* 00000010 "HVM....." */
>> 0x00,0x00,0x00,0x00,0x49,0x4E,0x54,0x4C, /* 00000018 "....INTL" */
>> - 0x07,0x07,0x06,0x20,0x08,0x50,0x4D,0x42, /* 00000020 "... .PMB" */
>> + 0x27,0x01,0x06,0x20,0x08,0x50,0x4D,0x42, /* 00000020 "'.. .PMB" */
>> 0x53,0x0B,0x00,0x0C,0x08,0x50,0x4D,0x4C, /* 00000028 "S....PML" */
>> 0x4E,0x0A,0x08,0x08,0x49,0x4F,0x42,0x31, /* 00000030 "N...IOB1" */
>> 0x00,0x08,0x49,0x4F,0x4C,0x31,0x00,0x08, /* 00000038 "..IOL1.." */
>> @@ -27,7 +27,7 @@ unsigned char AmlCode[] =
>> 0x04,0x0A,0x07,0x0A,0x07,0x00,0x00,0x08, /* 00000060 "........" */
>> 0x50,0x49,0x43,0x44,0x00,0x14,0x0C,0x5F, /* 00000068 "PICD..._" */
>> 0x50,0x49,0x43,0x01,0x70,0x68,0x50,0x49, /* 00000070 "PIC.phPI" */
>> - 0x43,0x44,0x10,0x44,0xD2,0x5F,0x53,0x42, /* 00000078 "CD.D._SB" */
>> + 0x43,0x44,0x10,0x4E,0xDE,0x5F,0x53,0x42, /* 00000078 "CD.N._SB" */
>> 0x5F,0x5B,0x82,0x49,0x04,0x4D,0x45,0x4D, /* 00000080 "_[.I.MEM" */
>> 0x30,0x08,0x5F,0x48,0x49,0x44,0x0C,0x41, /* 00000088 "0._HID.A" */
>> 0xD0,0x0C,0x02,0x08,0x5F,0x43,0x52,0x53, /* 00000090 "...._CRS" */
>> @@ -37,7 +37,7 @@ unsigned char AmlCode[] =
>> 0x00,0x00,0xFF,0xFF,0x09,0x00,0x00,0x00, /* 000000B0 "........" */
>> 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 000000B8 "........" */
>> 0x00,0x00,0x00,0x00,0x0A,0x00,0x00,0x00, /* 000000C0 "........" */
>> - 0x00,0x00,0x79,0x00,0x5B,0x82,0x41,0xCD, /* 000000C8 "..y.[.A." */
>> + 0x00,0x00,0x79,0x00,0x5B,0x82,0x4B,0xD9, /* 000000C8 "..y.[.K." */
>> 0x50,0x43,0x49,0x30,0x08,0x5F,0x48,0x49, /* 000000D0 "PCI0._HI" */
>> 0x44,0x0C,0x41,0xD0,0x0A,0x03,0x08,0x5F, /* 000000D8 "D.A...._" */
>> 0x55,0x49,0x44,0x00,0x08,0x5F,0x41,0x44, /* 000000E0 "UID.._AD" */
>> @@ -348,7 +348,7 @@ unsigned char AmlCode[] =
>> 0x0C,0x04,0x0C,0xFF,0xFF,0x0F,0x00,0x0A, /* 00000A68 "........" */
>> 0x02,0x00,0x0A,0x2F,0x12,0x0C,0x04,0x0C, /* 00000A70 ".../...." */
>> 0xFF,0xFF,0x0F,0x00,0x0A,0x03,0x00,0x0A, /* 00000A78 "........" */
>> - 0x10,0x5B,0x82,0x4C,0x31,0x49,0x53,0x41, /* 00000A80 ".[.L1ISA" */
>> + 0x10,0x5B,0x82,0x44,0x39,0x49,0x53,0x41, /* 00000A80 ".[.D9ISA" */
>> 0x5F,0x08,0x5F,0x41,0x44,0x52,0x0C,0x00, /* 00000A88 "_._ADR.." */
>> 0x00,0x01,0x00,0x5B,0x80,0x50,0x49,0x52, /* 00000A90 "...[.PIR" */
>> 0x51,0x02,0x0A,0x60,0x0A,0x04,0x10,0x2E, /* 00000A98 "Q..`...." */
>> @@ -434,19 +434,45 @@ unsigned char AmlCode[] =
>> 0x47,0x01,0xF0,0x03,0xF0,0x03,0x01,0x06, /* 00000D18 "G......." */
>> 0x47,0x01,0xF7,0x03,0xF7,0x03,0x01,0x01, /* 00000D20 "G......." */
>> 0x22,0x40,0x00,0x2A,0x04,0x00,0x79,0x00, /* 00000D28 ""@.*..y." */
>> - 0x5B,0x82,0x35,0x55,0x41,0x52,0x31,0x08, /* 00000D30 "[.5UAR1." */
>> - 0x5F,0x48,0x49,0x44,0x0C,0x41,0xD0,0x05, /* 00000D38 "_HID.A.." */
>> - 0x01,0x08,0x5F,0x55,0x49,0x44,0x01,0x14, /* 00000D40 ".._UID.." */
>> - 0x09,0x5F,0x53,0x54,0x41,0x00,0xA4,0x0A, /* 00000D48 "._STA..." */
>> - 0x0F,0x08,0x5F,0x43,0x52,0x53,0x11,0x10, /* 00000D50 ".._CRS.." */
>> - 0x0A,0x0D,0x47,0x01,0xF8,0x03,0xF8,0x03, /* 00000D58 "..G....." */
>> - 0x01,0x08,0x22,0x10,0x00,0x79,0x00,0x5B, /* 00000D60 ".."..y.[" */
>> - 0x82,0x36,0x4C,0x54,0x50,0x31,0x08,0x5F, /* 00000D68 ".6LTP1._" */
>> - 0x48,0x49,0x44,0x0C,0x41,0xD0,0x04,0x00, /* 00000D70 "HID.A..." */
>> - 0x08,0x5F,0x55,0x49,0x44,0x0A,0x02,0x14, /* 00000D78 "._UID..." */
>> - 0x09,0x5F,0x53,0x54,0x41,0x00,0xA4,0x0A, /* 00000D80 "._STA..." */
>> - 0x0F,0x08,0x5F,0x43,0x52,0x53,0x11,0x10, /* 00000D88 ".._CRS.." */
>> - 0x0A,0x0D,0x47,0x01,0x78,0x03,0x78,0x03, /* 00000D90 "..G.x.x." */
>> - 0x08,0x08,0x22,0x80,0x00,0x79,0x00,
>> + 0x5B,0x82,0x45,0x05,0x55,0x41,0x52,0x31, /* 00000D30 "[.E.UAR1" */
>> + 0x08,0x5F,0x48,0x49,0x44,0x0C,0x41,0xD0, /* 00000D38 "._HID.A." */
>> + 0x05,0x01,0x08,0x5F,0x55,0x49,0x44,0x01, /* 00000D40 "..._UID." */
>> + 0x14,0x28,0x5F,0x53,0x54,0x41,0x00,0x70, /* 00000D48 ".(_STA.p" */
>> + 0x5E,0x5E,0x5E,0x2E,0x50,0x58,0x31,0x33, /* 00000D50 "^^^.PX13" */
>> + 0x44,0x52,0x53,0x43,0x60,0x7B,0x60,0x0C, /* 00000D58 "DRSC`{`." */
>> + 0x00,0x00,0x00,0x08,0x60,0xA0,0x06,0x93, /* 00000D60 "....`..." */
>> + 0x60,0x00,0xA4,0x00,0xA1,0x04,0xA4,0x0A, /* 00000D68 "`......." */
>> + 0x0F,0x08,0x5F,0x43,0x52,0x53,0x11,0x10, /* 00000D70 ".._CRS.." */
>> + 0x0A,0x0D,0x47,0x01,0xF8,0x03,0xF8,0x03, /* 00000D78 "..G....." */
>> + 0x01,0x08,0x22,0x10,0x00,0x79,0x00,0x5B, /* 00000D80 ".."..y.[" */
>> + 0x82,0x46,0x05,0x55,0x41,0x52,0x32,0x08, /* 00000D88 ".F.UAR2." */
>> + 0x5F,0x48,0x49,0x44,0x0C,0x41,0xD0,0x05, /* 00000D90 "_HID.A.." */
>> + 0x01,0x08,0x5F,0x55,0x49,0x44,0x0A,0x02, /* 00000D98 ".._UID.." */
>> + 0x14,0x28,0x5F,0x53,0x54,0x41,0x00,0x70, /* 00000DA0 ".(_STA.p" */
>> + 0x5E,0x5E,0x5E,0x2E,0x50,0x58,0x31,0x33, /* 00000DA8 "^^^.PX13" */
>> + 0x44,0x52,0x53,0x43,0x60,0x7B,0x60,0x0C, /* 00000DB0 "DRSC`{`." */
>> + 0x00,0x00,0x00,0x80,0x60,0xA0,0x06,0x93, /* 00000DB8 "....`..." */
>> + 0x60,0x00,0xA4,0x00,0xA1,0x04,0xA4,0x0A, /* 00000DC0 "`......." */
>> + 0x0F,0x08,0x5F,0x43,0x52,0x53,0x11,0x10, /* 00000DC8 ".._CRS.." */
>> + 0x0A,0x0D,0x47,0x01,0xF8,0x02,0xF8,0x02, /* 00000DD0 "..G....." */
>> + 0x00,0x08,0x22,0x08,0x00,0x79,0x00,0x5B, /* 00000DD8 ".."..y.[" */
>> + 0x82,0x36,0x4C,0x54,0x50,0x31,0x08,0x5F, /* 00000DE0 ".6LTP1._" */
>> + 0x48,0x49,0x44,0x0C,0x41,0xD0,0x04,0x00, /* 00000DE8 "HID.A..." */
>> + 0x08,0x5F,0x55,0x49,0x44,0x0A,0x02,0x14, /* 00000DF0 "._UID..." */
>> + 0x09,0x5F,0x53,0x54,0x41,0x00,0xA4,0x0A, /* 00000DF8 "._STA..." */
>> + 0x0F,0x08,0x5F,0x43,0x52,0x53,0x11,0x10, /* 00000E00 ".._CRS.." */
>> + 0x0A,0x0D,0x47,0x01,0x78,0x03,0x78,0x03, /* 00000E08 "..G.x.x." */
>> + 0x08,0x08,0x22,0x80,0x00,0x79,0x00,0x5B, /* 00000E10 ".."..y.[" */
>> + 0x82,0x40,0x05,0x50,0x58,0x31,0x33,0x08, /* 00000E18 ".@.PX13." */
>> + 0x5F,0x41,0x44,0x52,0x0C,0x02,0x00,0x01, /* 00000E20 "_ADR...." */
>> + 0x00,0x5B,0x80,0x50,0x31,0x33,0x43,0x02, /* 00000E28 ".[.P13C." */
>> + 0x0A,0x5C,0x0A,0x24,0x5B,0x81,0x33,0x50, /* 00000E30 ".\.$[.3P" */
>> + 0x31,0x33,0x43,0x03,0x44,0x52,0x53,0x41, /* 00000E38 "13C.DRSA" */
>> + 0x20,0x44,0x52,0x53,0x42,0x20,0x44,0x52, /* 00000E40 " DRSB DR" */
>> + 0x53,0x43,0x20,0x44,0x52,0x53,0x45,0x20, /* 00000E48 "SC DRSE " */
>> + 0x44,0x52,0x53,0x46,0x20,0x44,0x52,0x53, /* 00000E50 "DRSF DRS" */
>> + 0x47,0x20,0x44,0x52,0x53,0x48,0x20,0x44, /* 00000E58 "G DRSH D" */
>> + 0x52,0x53,0x49,0x20,0x44,0x52,0x53,0x4A, /* 00000E60 "RSI DRSJ" */
>> + 0x20,
>> };
>> int DsdtLen=sizeof(AmlCode);
>> diff -r b3ff399f3be9 tools/ioemu/hw/piix4acpi.c
>> --- a/tools/ioemu/hw/piix4acpi.c Mon Jul 30 15:02:51 2007 -0400
>> +++ b/tools/ioemu/hw/piix4acpi.c Mon Jul 30 15:02:51 2007 -0400
>> @@ -166,6 +166,11 @@ void pci_piix4_acpi_init(PCIBus *bus, in
>> pci_conf[0x43] = 0x00;
>> d->pm1_control = SCI_EN;
>>
>> + /* ACPI BIOS determines presence of COM ports based on these decodes */
>> + pci_conf[0x63] = 0x60;
>> + pci_conf[0x67] = (serial_hds[0] != NULL ? 0x08 : 0) |
>> + (serial_hds[1] != NULL ? 0x90 : 0);
>> +
>> acpi_map((PCIDevice *)d, 0, 0x1f40, 0x10, PCI_ADDRESS_SPACE_IO);
>>
>> register_savevm("piix4acpi", 0, 1, piix4acpi_save, piix4acpi_load, d);
>>
>> _______________________________________________
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>> Xen-devel@xxxxxxxxxxxxxxxxxxx
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>
>
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