[SeaBIOS] [RFC PATCH v4 27/30] Add _OST dimm method

[Vasilis Liaskovitis]

Add support for _OST method. _OST method will write into the correct I/O byte to
signal success / failure of hot-add or hot-remove to qemu.
---
 src/acpi-dsdt-mem-hotplug.dsl |   51 ++++++++++++++++++++++++++++++++++++++++-
 src/ssdt-mem.dsl              |    4 +++
 2 files changed, 54 insertions(+), 1 deletions(-)

diff --git a/src/acpi-dsdt-mem-hotplug.dsl b/src/acpi-dsdt-mem-hotplug.dsl
index fd73ea7..a648bee 100644
--- a/src/acpi-dsdt-mem-hotplug.dsl
+++ b/src/acpi-dsdt-mem-hotplug.dsl
@@ -27,7 +27,28 @@ Scope(_SB) {
         {
             MPE, 8
         }
-        
+
+        /* Memory hot-remove notify failure byte */
+        OperationRegion(MEEF, SystemIO, 0xafa1, 1)
+        Field (MEEF, ByteAcc, NoLock, Preserve)
+        {
+            MEF, 8
+        }
+
+        /* Memory hot-add notify success byte */
+        OperationRegion(MPIS, SystemIO, 0xafa2, 1)
+        Field (MPIS, ByteAcc, NoLock, Preserve)
+        {
+            MIS, 8
+        }
+
+        /* Memory hot-add notify failure byte */
+        OperationRegion(MPIF, SystemIO, 0xafa3, 1)
+        Field (MPIF, ByteAcc, NoLock, Preserve)
+        {
+            MIF, 8
+        }
+
         Method(MESC, 0) {
             // Local5 = active memdevice bitmap
             Store (MES, Local5)
@@ -69,4 +90,32 @@ Scope(_SB) {
             Sleep(200)
         }

+        Method (MOST, 3, Serialized) {
+            // _OST method - OS status indication
+            Switch (And(Arg0, 0xFF)) {
+                Case(0x3)
+                {
+                    Switch(And(Arg1, 0xFF)) {
+                        Case(0x1) {
+                            Store(Arg2, MEF)
+                            // Revert MEON flag for this memory device to one
+                            Store(One, Index(MEON, Arg2))
+                        }
+                    }
+                }
+                Case(0x1)
+                {
+                    Switch(And(Arg1, 0xFF)) {
+                        Case(0x0) {
+                            Store(Arg2, MIS)
+                        }
+                        Case(0x1) {
+                            Store(Arg2, MIF)
+                            // Revert MEON flag for this memory device to zero
+                            Store(Zero, Index(MEON, Arg2))
+                        }
+                    }
+                }
+            }
+        }
 }
diff --git a/src/ssdt-mem.dsl b/src/ssdt-mem.dsl
index eef84b6..47a3b4f 100644
--- a/src/ssdt-mem.dsl
+++ b/src/ssdt-mem.dsl
@@ -38,6 +38,7 @@ DefinitionBlock ("ssdt-mem.aml", "SSDT", 0x02, "BXPC", "CSSDT", 0x1)

External(CMST, MethodObj)
         External(MPEJ, MethodObj)
+        External(MOST, MethodObj)

Name(_CRS, ResourceTemplate() {
             QwordMemory(
@@ -60,6 +61,9 @@ DefinitionBlock ("ssdt-mem.aml", "SSDT", 0x02, "BXPC", "CSSDT", 0x1)
         Method (_EJ0, 1, NotSerialized) {
             MPEJ(ID, Arg0)
         }
+        Method (_OST, 3) {
+            MOST(Arg0, Arg1, ID)
+        }
     }
 }