[Skiboot] [RFC PATCH 04/16] hdata: Setup memory for MDDT table

[Vasant Hegde]

Each entry in MDST and MDDT takes 16 bytes. With 1K we can have upto 64 entries.
This is sufficient to support memory preserving IPL.

Presently OPAL reserves 2K memory for MDST table. Lets split this into two
region of 1K for MDST and MDDT table.

Signed-off-by: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>
---
 include/mem-map.h | 8 ++++++--
 skiboot.lds.S     | 5 +++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/mem-map.h b/include/mem-map.h
index d2bc23fc4..12b0a71b3 100644
--- a/include/mem-map.h
+++ b/include/mem-map.h
@@ -49,12 +49,16 @@
  */
 #define PROCIN_OFF		(SPIRA_OFF + 0x800)
 
-/* Initial MDST table like PROCIN, we need fixed addresses,
+/* Initial MDST and MDDT tables like PROCIN, we need fixed addresses,
  * we leave a 2k gap for PROCIN
  */
 #define MDST_TABLE_OFF		(SPIRA_OFF + 0x1000)
+#define MDST_TABLE_SIZE		0x400
 
-/* Like MDST, we need fixed address for CPU control header.
+#define MDDT_TABLE_OFF		(SPIRA_OFF + 0x1400)
+#define MDDT_TABLE_SIZE		0x400
+
+/* Like MDST and MDDT, we need fixed address for CPU control header.
  * We leave a 2k gap for MDST. CPU_CTL table is of size ~4k
  */
 #define CPU_CTL_OFF             (SPIRA_OFF + 0x1800)
diff --git a/skiboot.lds.S b/skiboot.lds.S
index a6e71077c..bc134fd41 100644
--- a/skiboot.lds.S
+++ b/skiboot.lds.S
@@ -46,6 +46,11 @@ SECTIONS
 		KEEP(*(.mdst.data))
 	}
 
+	. = MDDT_TABLE_OFF;
+	.mddt : {
+		KEEP(*(.mddt.data))
+	}
+
 	. = CPU_CTL_OFF;
 	.cpuctrl : {
 		KEEP(*(.cpuctrl.data))
-- 
2.14.3