From e1860604e46780d08ee2dab568cf80bf2d349c16 Mon Sep 17 00:00:00 2001
From: Vadim Bendebury <vbendeb@chromium.org>
Date: Tue, 20 Sep 2011 17:07:14 -0700
Subject: [PATCH] Initialize CBMEM early.

We want to be able to share data between different phases of firmware
(rom stage/ram stage/payload). Coreboot CBMEM seems an appropriate
location for this data, but normally it is not initialized
until coreboot reaches the ram stage.

This change initializes the CBMEM while still in rom stage in
case CONFIG_EARLY_CBMEM_INIT is set.

Note that there is a discrepancy in how coreboot determines the
size of DRAM at rom and ram stages, get_top_of_ram() is used at
rom stage and is not defined for all platforms. Those platforms
will have to define this function should they enable the
CONFIG_EARLY_CBMEM_INIT flag.

Change-Id: I81691d45e28de59496fb227f2cca4e8c15ece717
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: http://review.coreboot.org/711
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
---
 src/include/cbmem.h |  4 +++-
 src/lib/cbmem.c     | 43 +++++++++++++++++++++++++------------------
 2 files changed, 28 insertions(+), 19 deletions(-)

diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 98068543f2..a681c36ea8 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -22,7 +22,9 @@
 
 /* Reserve 128k for ACPI and other tables */
 #define HIGH_MEMORY_DEF_SIZE	( 128 * 1024 )
+#ifndef __PRE_RAM__
 extern uint64_t high_tables_base, high_tables_size;
+#endif
 
 #if CONFIG_HAVE_ACPI_RESUME
 #define HIGH_MEMORY_SIZE	((CONFIG_RAMTOP - CONFIG_RAMBASE) + HIGH_MEMORY_DEF_SIZE)
@@ -41,7 +43,7 @@ extern uint64_t high_tables_base, high_tables_size;
 #define CBMEM_ID_SMBIOS         0x534d4254
 #define CBMEM_ID_NONE		0x00000000
 
-void cbmem_initialize(void);
+int cbmem_initialize(void);
 
 void cbmem_init(u64 baseaddr, u64 size);
 int cbmem_reinit(u64 baseaddr);
diff --git a/src/lib/cbmem.c b/src/lib/cbmem.c
index 202f521fdb..f5c3d3a811 100644
--- a/src/lib/cbmem.c
+++ b/src/lib/cbmem.c
@@ -183,30 +183,38 @@ void *cbmem_find(u32 id)
 	return (void *)NULL;
 }
 
-#ifndef __PRE_RAM__
-#if CONFIG_HAVE_ACPI_RESUME
+#if CONFIG_HAVE_ACPI_RESUME && !defined(__PRE_RAM__)
 extern u8 acpi_slp_type;
 #endif
 
-void cbmem_initialize(void)
+#if CONFIG_EARLY_CBMEM_INIT || !defined(__PRE_RAM__)
+/* Returns True if it was not intialized before. */
+int cbmem_initialize(void)
 {
-#if CONFIG_HAVE_ACPI_RESUME
-	printk(BIOS_DEBUG, "%s: acpi_slp_type=%d\n", __func__, acpi_slp_type);
-	if (acpi_slp_type == 3 || acpi_slp_type == 2) {
-		if (!cbmem_reinit(high_tables_base)) {
-			printk(BIOS_DEBUG, "cbmem_reinit failed\n");
-			/* Something went wrong, our high memory area got wiped */
-			acpi_slp_type = 0;
-			cbmem_init(high_tables_base, high_tables_size);
-		}
-	} else {
-		cbmem_init(high_tables_base, high_tables_size);
-	}
-#else
-	cbmem_init(high_tables_base, high_tables_size);
+	int rv = 0;
+
+#ifdef __PRE_RAM__
+	extern unsigned long get_top_of_ram(void);
+	uint64_t high_tables_base = get_top_of_ram() - HIGH_MEMORY_SIZE;
+	uint64_t high_tables_size = HIGH_MEMORY_SIZE;
 #endif
+
+	/* We expect the romstage to always initialize it. */
+	if (!cbmem_reinit(high_tables_base)) {
+#if CONFIG_HAVE_ACPI_RESUME && !defined(__PRE_RAM__)
+		/* Something went wrong, our high memory area got wiped */
+		if (acpi_slp_type == 3 || acpi_slp_type == 2)
+			acpi_slp_type = 0;
+#endif
+		cbmem_init(high_tables_base, high_tables_size);
+		rv = 1;
+	}
+#ifndef __PRE_RAM__
 	cbmem_arch_init();
+#endif
+	return rv;
 }
+#endif
 
 #ifndef __PRE_RAM__
 void cbmem_list(void)
@@ -240,5 +248,4 @@ void cbmem_list(void)
 }
 #endif
 
-#endif