pc: acpi-build: drop template patching and create Device(SMC) dynamically

patch moves SMC device into SSDT and creates it only
when device is present, which makes ACPI tables smaller
in default case when device is not present.

Also it fixes wrong IO range in CRS if "iobase"
property is set to a non default value.

PS:
Testing with XP shows that current default "iobase"
used SMC device conflicts with floppy controller IO,
but it's topic for another patch and I'd leave it
to SMC device author for resolving conflict.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
CC: agraf@suse.de
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

4 files changed, 22 insertions, 20 deletions

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index badfa73..05eb80a 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -116,6 +116,7 @@ typedef struct AcpiMiscInfo {
     const unsigned char *dsdt_code;
     unsigned dsdt_size;
     uint16_t pvpanic_port;
+    uint16_t applesmc_io_base;
 } AcpiMiscInfo;
 
 typedef struct AcpiBuildPciBusHotplugState {
@@ -127,7 +128,6 @@ typedef struct AcpiBuildPciBusHotplugState {
 
 static void acpi_get_dsdt(AcpiMiscInfo *info)
 {
-    uint16_t *applesmc_sta;
     Object *piix = piix4_pm_find();
     Object *lpc = ich9_lpc_find();
     assert(!!piix != !!lpc);
@@ -135,17 +135,11 @@ static void acpi_get_dsdt(AcpiMiscInfo *info)
     if (piix) {
         info->dsdt_code = AcpiDsdtAmlCode;
         info->dsdt_size = sizeof AcpiDsdtAmlCode;
-        applesmc_sta = piix_dsdt_applesmc_sta;
     }
     if (lpc) {
         info->dsdt_code = Q35AcpiDsdtAmlCode;
         info->dsdt_size = sizeof Q35AcpiDsdtAmlCode;
-        applesmc_sta = q35_dsdt_applesmc_sta;
     }
-
-    /* Patch in appropriate value for AppleSMC _STA */
-    *(uint8_t *)(info->dsdt_code + *applesmc_sta) =
-        applesmc_port() ? 0x0b : 0x00;
 }
 
 static
@@ -248,6 +242,7 @@ static void acpi_get_misc_info(AcpiMiscInfo *info)
     info->has_hpet = hpet_find();
     info->has_tpm = tpm_find();
     info->pvpanic_port = pvpanic_port();
+    info->applesmc_io_base = applesmc_port();
 }
 
 static void acpi_get_pci_info(PcPciInfo *info)
@@ -955,6 +950,26 @@ build_ssdt(GArray *table_data, GArray *linker,
     aml_append(scope, aml_name_decl("_S5", pkg));
     aml_append(ssdt, scope);
 
+    if (misc->applesmc_io_base) {
+        scope = aml_scope("\\_SB.PCI0.ISA");
+        dev = aml_device("SMC");
+
+        aml_append(dev, aml_name_decl("_HID", aml_eisaid("APP0001")));
+        /* device present, functioning, decoding, not shown in UI */
+        aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
+
+        crs = aml_resource_template();
+        aml_append(crs,
+            aml_io(aml_decode16, misc->applesmc_io_base, misc->applesmc_io_base,
+                   0x01, APPLESMC_MAX_DATA_LENGTH)
+        );
+        aml_append(crs, aml_irq_no_flags(6));
+        aml_append(dev, aml_name_decl("_CRS", crs));
+
+        aml_append(scope, dev);
+        aml_append(ssdt, scope);
+    }
+
     if (misc->pvpanic_port) {
         scope = aml_scope("\\_SB.PCI0.ISA");
 
diff --git a/hw/i386/acpi-dsdt-isa.dsl b/hw/i386/acpi-dsdt-isa.dsl
index deb37de..89caa16 100644
--- a/hw/i386/acpi-dsdt-isa.dsl
+++ b/hw/i386/acpi-dsdt-isa.dsl
@@ -16,17 +16,6 @@
 /* Common legacy ISA style devices. */
 Scope(\_SB.PCI0.ISA) {
 
-    Device (SMC) {
-        Name(_HID, EisaId("APP0001"))
-        /* _STA will be patched to 0x0B if AppleSMC is present */
-        ACPI_EXTRACT_NAME_BYTE_CONST DSDT_APPLESMC_STA
-        Name(_STA, 0xF0)
-        Name(_CRS, ResourceTemplate () {
-            IO (Decode16, 0x0300, 0x0300, 0x01, 0x20)
-            IRQNoFlags() { 6 }
-        })
-    }
-
     Device(RTC) {
         Name(_HID, EisaId("PNP0B00"))
         Name(_CRS, ResourceTemplate() {
diff --git a/hw/i386/acpi-dsdt.dsl b/hw/i386/acpi-dsdt.dsl
index 09b68f0..a2d84ec 100644
--- a/hw/i386/acpi-dsdt.dsl
+++ b/hw/i386/acpi-dsdt.dsl
@@ -85,7 +85,6 @@ DefinitionBlock (
         }
     }
 
-#define DSDT_APPLESMC_STA piix_dsdt_applesmc_sta
 #include "acpi-dsdt-isa.dsl"
 
 
diff --git a/hw/i386/q35-acpi-dsdt.dsl b/hw/i386/q35-acpi-dsdt.dsl
index 3fb4b2f..16eaca3 100644
--- a/hw/i386/q35-acpi-dsdt.dsl
+++ b/hw/i386/q35-acpi-dsdt.dsl
@@ -150,7 +150,6 @@ DefinitionBlock (
         }
     }
 
-#define DSDT_APPLESMC_STA q35_dsdt_applesmc_sta
 #include "acpi-dsdt-isa.dsl"