[coreboot-gerrit] Change in coreboot[master]: soc/intel/common: Add intel common EBDA support

[Subrata Banik (Code Review)]

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/21538


Change subject: soc/intel/common: Add intel common EBDA support
......................................................................

soc/intel/common: Add intel common EBDA support

This patch provides EBDA library for soc usage.

Change-Id: I8355a1dd528b111f1391e6d28a9b174edddc9ca0
Signed-off-by: Subrata Banik <subrata.banik at intel.com>
---
A src/soc/intel/common/block/ebda/Kconfig
A src/soc/intel/common/block/ebda/Makefile.inc
A src/soc/intel/common/block/ebda/ebda.c
A src/soc/intel/common/block/include/intelblocks/ebda.h
4 files changed, 147 insertions(+), 0 deletions(-)



  git pull ssh://review.coreboot.org:29418/coreboot refs/changes/38/21538/1

diff --git a/src/soc/intel/common/block/ebda/Kconfig b/src/soc/intel/common/block/ebda/Kconfig
new file mode 100644
index 0000000..67c7b48
--- /dev/null
+++ b/src/soc/intel/common/block/ebda/Kconfig
@@ -0,0 +1,5 @@
+config SOC_INTEL_COMMON_BLOCK_EBDA
+	bool
+	select EARLY_EBDA_INIT
+	help
+	  Intel Processor common EBDA library support
diff --git a/src/soc/intel/common/block/ebda/Makefile.inc b/src/soc/intel/common/block/ebda/Makefile.inc
new file mode 100644
index 0000000..beeba51
--- /dev/null
+++ b/src/soc/intel/common/block/ebda/Makefile.inc
@@ -0,0 +1,3 @@
+romstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_EBDA) += ebda.c
+ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_EBDA) += ebda.c
+postcar-$(CONFIG_SOC_INTEL_COMMON_BLOCK_EBDA) += ebda.c
diff --git a/src/soc/intel/common/block/ebda/ebda.c b/src/soc/intel/common/block/ebda/ebda.c
new file mode 100644
index 0000000..f8058b8
--- /dev/null
+++ b/src/soc/intel/common/block/ebda/ebda.c
@@ -0,0 +1,70 @@
+/*
+ * This file is part of the coreboot project.
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <intelblocks/ebda.h>
+
+/*
+ * Mainboard Override function
+ *
+ * Mainboard directory may implement below functionality for romstage.
+ */
+
+/* Fill up EBDA structure inside Mainboard directory */
+__attribute__((weak)) void create_mainboard_ebda(ebda_config *cfg)
+{
+	/* no-op */
+}
+
+/*
+ * SoC overrides
+ *
+ * All new SoC must implement below functionality for romstage.
+ */
+__attribute__((weak)) void fill_soc_memmap_ebda(ebda_config *cfg)
+{
+	/* no-op */
+}
+
+bool is_ebda_initialized(ebda_config *cfg)
+{
+	cfg = (ebda_config *)read_ebda_data(sizeof(ebda_config));
+
+	if (cfg->signature == EBDA_SIGNATURE)
+		return true;
+
+	return false;
+}
+
+static void create_soc_ebda(ebda_config *cfg)
+{
+	/* Create EBDA header */
+	cfg->signature = EBDA_SIGNATURE;
+	/* Fill up memory layout information */
+	fill_soc_memmap_ebda(cfg);
+}
+
+void fill_ebda_area(void)
+{
+	ebda_config *cfg = NULL;
+
+	/* If EBDA area is already initialized then return */
+	if (is_ebda_initialized(cfg))
+		return;
+
+	/* Initialize EBDA area early during romstage. */
+	setup_default_ebda();
+	create_soc_ebda(cfg);
+	create_mainboard_ebda(cfg);
+	write_ebda_data(cfg, sizeof(ebda_config));
+}
diff --git a/src/soc/intel/common/block/include/intelblocks/ebda.h b/src/soc/intel/common/block/include/intelblocks/ebda.h
new file mode 100644
index 0000000..ccb968a
--- /dev/null
+++ b/src/soc/intel/common/block/include/intelblocks/ebda.h
@@ -0,0 +1,69 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef SOC_INTEL_COMMON_BLOCK_EBDA_H
+#define SOC_INTEL_COMMON_BLOCK_EBDA_H
+
+#include <arch/ebda.h>
+#include <compiler.h>
+#include <soc/ebda.h>
+
+#define EBDA_SIGNATURE 0xebda
+
+/* API to check if EBDA area already initialized */
+bool is_ebda_initialized(ebda_config *cfg);
+
+/*
+ * Mainboard Override function
+ *
+ * Mainboard directory may implement below functionality for romstage.
+ */
+
+/* Fill up EBDA structure inside Mainboard directory */
+void create_mainboard_ebda(ebda_config *cfg);
+
+/*
+ * SoC overrides
+ *
+ * All new SoC must implement below functionality for romstage.
+ */
+void fill_soc_memmap_ebda(ebda_config *cfg);
+
+/*
+ * API to perform below operation
+ * 1. Initialize EBDA area
+ * 2. Fill up EBDA structure inside SOC directory
+ * 3. Fill up EBDA structure inside Mainboard directory
+ * 4. Store EBDA structure into EBDA area
+ */
+void fill_ebda_area(void);
+
+/*
+ * EBDA structure
+ *
+ * SOC should implement EBDA structure as per need
+ * as below.
+ *
+ * Note: First 4 bytes should be reserved for signature as
+ * 0xEBDA
+ *
+ * typedef struct {
+ *	uint32_t signature;
+ *	<Required variables..>
+ * }__packed ebda_config;
+ *
+  */
+
+#endif

-- 
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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I8355a1dd528b111f1391e6d28a9b174edddc9ca0
Gerrit-Change-Number: 21538
Gerrit-PatchSet: 1
Gerrit-Owner: Subrata Banik <subrata.banik at intel.com>
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