[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PULL v2 08/58] acpi: serial: don't use _STA method
From: |
Michael S. Tsirkin |
Subject: |
[PULL v2 08/58] acpi: serial: don't use _STA method |
Date: |
Fri, 12 Jun 2020 10:51:18 -0400 |
From: Gerd Hoffmann <kraxel@redhat.com>
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>
---
hw/i386/acpi-build.c | 32 ++++++++------------------------
1 file changed, 8 insertions(+), 24 deletions(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index df5417c75f..cb22cb0fe6 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -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");
--
MST
- [PULL v2 00/58] virtio,acpi,pci: features, fixes, cleanups, tests, Michael S. Tsirkin, 2020/06/12
- [PULL v2 01/58] msix: allow qword MSI-X table accesses, Michael S. Tsirkin, 2020/06/12
- [PULL v2 03/58] hw/acpi/nvdimm: add a helper to augment SRAT generation, Michael S. Tsirkin, 2020/06/12
- [PULL v2 07/58] acpi: rtc: use a single crs range, Michael S. Tsirkin, 2020/06/12
- [PULL v2 06/58] acpi: move aml builder code for rtc device, Michael S. Tsirkin, 2020/06/12
- [PULL v2 08/58] acpi: serial: don't use _STA method,
Michael S. Tsirkin <=
- [PULL v2 10/58] acpi: parallel: don't use _STA method, Michael S. Tsirkin, 2020/06/12
- [PULL v2 09/58] acpi: move aml builder code for serial device, Michael S. Tsirkin, 2020/06/12
- [PULL v2 11/58] acpi: move aml builder code for parallel device, Michael S. Tsirkin, 2020/06/12
- [PULL v2 13/58] acpi: tpm: Do not build TCPA table for TPM 2, Michael S. Tsirkin, 2020/06/12
- [PULL v2 15/58] acpi: Move build_tpm2() in the generic part, Michael S. Tsirkin, 2020/06/12
- [PULL v2 16/58] arm/acpi: TPM2 ACPI table support, Michael S. Tsirkin, 2020/06/12
- [PULL v2 12/58] tests/acpi: update DSDT expected files, Michael S. Tsirkin, 2020/06/12
- [PULL v2 19/58] tests: tpm-emu: Remove assert on TPM2_ST_NO_SESSIONS, Michael S. Tsirkin, 2020/06/12
- [PULL v2 21/58] bios-tables-test: Generate reference tables for Q35/TPM-TIS, Michael S. Tsirkin, 2020/06/12
- [PULL v2 20/58] bios-tables-test: Add Q35/TPM-TIS test, Michael S. Tsirkin, 2020/06/12