[RFC PATCH 1/9][SeaBIOS] Add SSDT memory device support

[Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>]

Define SSDT hotplug-able memory devices in _SB namespace. The dynamically
generated SSDT includes per memory device hotplug methods. These methods
just call methods defined in the DSDT. Also dynamically generate a MTFY
method and a MEON array of the online/available memory devices.  Add file
src/ssdt-mem.dsl with directions for generating the per-memory device
processor object AML code.
The design is taken from SSDT cpu generation.

Signed-off-by: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
---
 src/ssdt-mem.dsl |   66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 66 insertions(+), 0 deletions(-)
 create mode 100644 src/ssdt-mem.dsl

diff --git a/src/ssdt-mem.dsl b/src/ssdt-mem.dsl
new file mode 100644
index 0000000..9586643
--- /dev/null
+++ b/src/ssdt-mem.dsl
@@ -0,0 +1,66 @@
+/* This file is the basis for the ssdt_mem[] variable in src/acpi.c.
+ * It is similar in design to the ssdt_proc variable.  
+ * It defines the contents of the per-cpu Processor() object.  At
+ * runtime, a dynamically generated SSDT will contain one copy of this
+ * AML snippet for every possible memory device in the system.  The 
+ * objects will * be placed in the \_SB_ namespace.
+ *
+ * To generate a new ssdt_memc[], run the commands:
+ *   cpp -P src/ssdt-mem.dsl > out/ssdt-mem.dsl.i
+ *   iasl -ta -p out/ssdt-mem out/ssdt-mem.dsl.i
+ *   tail -c +37 < out/ssdt-mem.aml | hexdump -e '"    " 8/1 "0x%02x," "\n"'
+ * and then cut-and-paste the output into the src/acpi.c ssdt_mem[]
+ * array.
+ *
+ * In addition to the aml code generated from this file, the
+ * src/acpi.c file creates a MEMNTFY method with an entry for each memdevice:
+ *     Method(MTFY, 2) {
+ *         If (LEqual(Arg0, 0x00)) { Notify(MP00, Arg1) }
+ *         If (LEqual(Arg0, 0x01)) { Notify(MP01, Arg1) }
+ *         ...
+ *     }
+ * and a MEON array with the list of active and inactive memory devices:
+ *     Name(MEON, Package() { One, One, ..., Zero, Zero, ... })
+ */
+DefinitionBlock ("ssdt-mem.aml", "SSDT", 0x02, "BXPC", "CSSDT", 0x1)
+/*  v------------------ DO NOT EDIT ------------------v */
+{
+    Device(MPAA) {
+        Name(ID, 0xAA)
+/*  ^------------------ DO NOT EDIT ------------------^
+ *
+ * The src/acpi.c code requires the above layout so that it can update
+ * MPAA and 0xAA with the appropriate MEMDEVICE id (see
+ * SD_OFFSET_MEMHEX/MEMID1/MEMID2).  Don't change the above without
+ * also updating the C code.
+ */
+        Name(_HID, EISAID("PNP0C80"))
+        Name(_PXM, 0xAA)
+
+        External(CMST, MethodObj)
+        External(MPEJ, MethodObj)
+
+        Name(_CRS, ResourceTemplate() {
+            QwordMemory(
+               ResourceConsumer,
+               ,
+               MinFixed,
+               MaxFixed,
+               Cacheable,
+               ReadWrite, 
+               0x0, 
+               0xDEADBEEF, 
+               0xE6ADBEEE, 
+               0x00000000,
+               0x08000000, 
+               )
+        })
+        Method (_STA, 0) {
+            Return(CMST(ID))        
+        }    
+        Method (_EJ0, 1, NotSerialized) {
+            MPEJ(ID, Arg0)
+        }
+    }
+}    
+
-- 
1.7.9