x86: Prepare configuration tables in dedicated high memory region

Currently when CONFIG_SEABIOS is on, U-Boot allocates configuration
tables via normal malloc(). To simplify, use a dedicated memory
region which is reserved on the stack before relocation for this
purpose. Add functions for reserve and malloc.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

2 files changed, 23 insertions, 0 deletions

diff --git a/arch/x86/include/asm/coreboot_tables.h b/arch/x86/include/asm/coreboot_tables.h
index 15ccf9be6c..e036f744f6 100644
--- a/arch/x86/include/asm/coreboot_tables.h
+++ b/arch/x86/include/asm/coreboot_tables.h
@@ -295,6 +295,25 @@ struct cbmem_entry {
 #define CBMEM_ID_NONE			0x00000000
 
 /**
+ * high_table_reserve() - reserve configuration table in high memory
+ *
+ * This reserves configuration table in high memory.
+ *
+ * @return:	always 0
+ */
+int high_table_reserve(void);
+
+/**
+ * high_table_malloc() - allocate configuration table in high memory
+ *
+ * This allocates configuration table in high memory.
+ *
+ * @bytes:	size of configuration table to be allocated
+ * @return:	pointer to configuration table in high memory
+ */
+void *high_table_malloc(size_t bytes);
+
+/**
  * write_coreboot_table() - write coreboot table
  *
  * This writes coreboot table at a given address.
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h
index 3bc2ac24cf..7434f779b6 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -93,6 +93,10 @@ struct arch_global_data {
 	char *mrc_output;
 	unsigned int mrc_output_len;
 	ulong table;			/* Table pointer from previous loader */
+#ifdef CONFIG_SEABIOS
+	u32 high_table_ptr;
+	u32 high_table_limit;
+#endif
 };
 
 #endif