[SeaBIOS] [PATCH v5 2/7] Add SSDT memory device support

[Hu Tao]

From: Vasilis Liaskovitis <vasilis.liaskovitis at 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.  ACPI
extraction macros are used to place the AML code in variables later used by
src/acpi. The design is taken from SSDT cpu generation.

Signed-off-by: Vasilis Liaskovitis <vasilis.liaskovitis at profitbricks.com>
---
 Makefile         |  2 +-
 src/ssdt-mem.dsl | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+), 1 deletion(-)
 create mode 100644 src/ssdt-mem.dsl

diff --git a/Makefile b/Makefile
index 759bbbb..b88fb90 100644
--- a/Makefile
+++ b/Makefile
@@ -223,7 +223,7 @@ $(OUT)%.hex: src/%.dsl ./tools/acpi_extract_preprocess.py ./tools/acpi_extract.p
 	$(Q)$(PYTHON) ./tools/acpi_extract.py $(OUT)$*.lst > $(OUT)$*.off
 	$(Q)cat $(OUT)$*.off > $@
 
-$(OUT)acpi.o: $(OUT)acpi-dsdt.hex $(OUT)ssdt-proc.hex $(OUT)ssdt-pcihp.hex $(OUT)ssdt-misc.hex $(OUT)q35-acpi-dsdt.hex
+$(OUT)acpi.o: $(OUT)acpi-dsdt.hex $(OUT)ssdt-proc.hex $(OUT)ssdt-pcihp.hex $(OUT)ssdt-misc.hex $(OUT)q35-acpi-dsdt.hex $(OUT)ssdt-mem.hex
 
 ################ Kconfig rules
 
diff --git a/src/ssdt-mem.dsl b/src/ssdt-mem.dsl
new file mode 100644
index 0000000..d0f6203
--- /dev/null
+++ b/src/ssdt-mem.dsl
@@ -0,0 +1,61 @@
+/* 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-dimm QWordMemory() 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.
+ *
+ * In addition to the aml code generated from this file, the
+ * src/acpi.c file creates a MTFY 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, ... })
+ */
+ACPI_EXTRACT_ALL_CODE ssdm_mem_aml
+
+DefinitionBlock ("ssdt-mem.aml", "SSDT", 0x02, "BXPC", "CSSDT", 0x1)
+/*  v------------------ DO NOT EDIT ------------------v */
+{
+    ACPI_EXTRACT_DEVICE_START ssdt_mem_start
+    ACPI_EXTRACT_DEVICE_END ssdt_mem_end
+    ACPI_EXTRACT_DEVICE_STRING ssdt_mem_name
+    Device(MPAA) {
+        ACPI_EXTRACT_NAME_BYTE_CONST ssdt_mem_id
+        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,
+               ,                     // _DEC
+               MinFixed,             // _MIF
+               MaxFixed,             // _MAF
+               Cacheable,            // _MEM
+               ReadWrite,            // _RW
+               0x0,                  // _GRA
+               0xDEADBEEF,           // _MIN
+               0xE6ADBEEE,           // _MAX
+               0x00000000,           // _TRA
+               0x08000000,           // _LEN
+               )
+        })
+        Method (_STA, 0) {
+            Return(CMST(ID))
+        }
+    }
+}
-- 
1.8.3.1