[coreboot-gerrit] Change in coreboot[master]: soc/intel/skylake: Calculate soc reserved memory size

[Subrata Banik (Code Review)]

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/21540

Change subject: soc/intel/skylake: Calculate soc reserved memory size
......................................................................

soc/intel/skylake: Calculate soc reserved memory size

Read EBDA area to get intel various reserved memory (PRMRR,
TraceHub, PTT etc) size which generates  during romstage
memory calculation.

BRANCH=none
BUG=b:63974384
TEST=Ensures DRAM based resource allocation has taken care
of intel soc reserved ranges.

Change-Id: I19583f7d18ca11c3a58eb61c927e5c3c3b65d2ec
Signed-off-by: Subrata Banik 
---
M src/soc/intel/skylake/systemagent.c
1 file changed, 18 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/40/21540/1

diff --git a/src/soc/intel/skylake/systemagent.c b/src/soc/intel/skylake/systemagent.c
index 6149fa2..f2948ab 100644
--- a/src/soc/intel/skylake/systemagent.c
+++ b/src/soc/intel/skylake/systemagent.c
@@ -18,6 +18,7 @@
 #include <console/console.h>
 #include <delay.h>
 #include <device/device.h>
+#include <intelblocks/ebda.h>
 #include <intelblocks/systemagent.h>
 #include <soc/cpu.h>
 #include <soc/iomap.h>
@@ -62,3 +63,20 @@
    mdelay(1);
    set_power_limits(28);
 }
+
+/*
+ * SoC implementation
+ *
+ * SoC call to summarize all Intel Reserve MMIO size and report to SA
+ */
+size_t soc_reversed_mmio_size(void)
+{
+	ebda_config *cfg = NULL;
+
+	if (!is_ebda_initialized(cfg))
+		return 0;
+
+	cfg = (ebda_config *)read_ebda_data(sizeof(ebda_config));
+
+	return cfg->prmrr_size + cfg->tracehub_size + cfg->ptt_size;
+}