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acpi: serial: don't use _STA method

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The _STA method dates back to the days where we had a static DSDT.  The
device is listed in the DSDT table unconditionally and the _STA method
checks a bit in the isa bridge pci config space to figure whenever a
given is isa device is present or not, then evaluates to 0x0f (present)
or 0x00 (absent).

These days the DSDT is generated by qemu anyway, so if a device is not
present we can simply drop it from the DSDT instead.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200515150421.25479-5-kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2020-05-15 17:04:09 +02:00 committed by Michael S. Tsirkin
parent f592b94f3c
commit 4b8e369b91
1 changed files with 8 additions and 24 deletions
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32
hw/i386/acpi-build.c
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@ -1208,50 +1208,34 @@ static Aml *build_lpt_device_aml(void)
return dev;
}
static Aml *build_com_device_aml(uint8_t uid)
static void build_com_device_aml(Aml *scope, uint8_t uid)
{
Aml *dev;
Aml *crs;
Aml *method;
Aml *if_ctx;
Aml *else_ctx;
Aml *zero = aml_int(0);
Aml *is_present = aml_local(0);
const char *enabled_field = "CAEN";
uint8_t irq = 4;
uint16_t io_port = 0x03F8;
assert(uid == 1 || uid == 2);
if (uid == 2) {
enabled_field = "CBEN";
irq = 3;
io_port = 0x02F8;
}
if (!memory_region_present(get_system_io(), io_port)) {
return;
}
dev = aml_device("COM%d", uid);
aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0501")));
aml_append(dev, aml_name_decl("_UID", aml_int(uid)));
method = aml_method("_STA", 0, AML_NOTSERIALIZED);
aml_append(method, aml_store(aml_name("%s", enabled_field), is_present));
if_ctx = aml_if(aml_equal(is_present, zero));
{
aml_append(if_ctx, aml_return(aml_int(0x00)));
}
aml_append(method, if_ctx);
else_ctx = aml_else();
{
aml_append(else_ctx, aml_return(aml_int(0x0f)));
}
aml_append(method, else_ctx);
aml_append(dev, method);
aml_append(dev, aml_name_decl("_STA", aml_int(0xf)));
crs = aml_resource_template();
aml_append(crs, aml_io(AML_DECODE16, io_port, io_port, 0x00, 0x08));
aml_append(crs, aml_irq_no_flags(irq));
aml_append(dev, aml_name_decl("_CRS", crs));
return dev;
aml_append(scope, dev);
}
static void build_isa_devices_aml(Aml *table)
@ -1268,8 +1252,8 @@ static void build_isa_devices_aml(Aml *table)
aml_append(scope, build_fdc_device_aml(fdc));
}
aml_append(scope, build_lpt_device_aml());
aml_append(scope, build_com_device_aml(1));
aml_append(scope, build_com_device_aml(2));
build_com_device_aml(scope, 1);
build_com_device_aml(scope, 2);
if (ambiguous) {
error_report("Multiple ISA busses, unable to define IPMI ACPI data");