intel/model_2065x: Prepare for dynamic CONFIG_RAMTOP

Change-Id: I616143b55d7c5726dc2475434e3fcb08b8d69bda
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/15230
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/cpu/intel/model_2065x/Makefile.inc

@@ -20,3 +20,4 @@ smm-$(CONFIG_HAVE_SMI_HANDLER) += finalize.c
 cpu_microcode_bins += 3rdparty/blobs/cpu/intel/model_2065x/microcode.bin
 
 cpu_incs-y += $(src)/cpu/intel/model_2065x/cache_as_ram.inc
+romstage-y += ../car/romstage.c

src/cpu/intel/model_2065x/cache_as_ram.inc

@@ -170,7 +170,12 @@ clear_var_mtrrs:
 before_romstage:
 	post_code(0x29)
 	/* Call romstage.c main function. */
-	call	main
+	call	romstage_main
+
+	/* Save return value from romstage_main. It contains the stack to use
+	 * after cache-as-ram is torn down.
+	 */
+	movl	%eax, %ebx
 
 	post_code(0x2f)
 
@@ -272,7 +277,8 @@ __main:
 	post_code(POST_PREPARE_RAMSTAGE)
 	cld			/* Clear direction flag. */
 
-	movl	$CONFIG_RAMTOP, %esp
+	/* Setup stack as indicated by return value from romstage_main(). */
+	movl	%ebx, %esp
 	movl	%esp, %ebp
 	call	copy_and_run
 

src/mainboard/lenovo/x201/romstage.c

@@ -28,6 +28,7 @@
 #include <pc80/mc146818rtc.h>
 #include <console/console.h>
 #include <cpu/x86/bist.h>
+#include <cpu/intel/romstage.h>
 #include <ec/acpi/ec.h>
 #include <delay.h>
 #include <timestamp.h>
@@ -174,8 +175,7 @@ static void set_fsb_frequency(void)
 	smbus_block_write(0x69, 0, 5, block);
 }
 
-#include <cpu/intel/romstage.h>
-void main(unsigned long bist)
+void mainboard_romstage_entry(unsigned long bist)
 {
 	u32 reg32;
 	int s3resume = 0;

src/mainboard/packardbell/ms2290/romstage.c

@@ -28,12 +28,12 @@
 #include <pc80/mc146818rtc.h>
 #include <console/console.h>
 #include <cpu/x86/bist.h>
+#include <cpu/intel/romstage.h>
 #include <ec/acpi/ec.h>
 #include <delay.h>
 #include <timestamp.h>
 #include <arch/acpi.h>
 #include <cbmem.h>
-#include <cpu/intel/romstage.h>
 
 #include "arch/early_variables.h"
 #include <southbridge/intel/ibexpeak/pch.h>
@@ -166,8 +166,7 @@ static inline u16 read_acpi16(u32 addr)
 }
 #endif
 
-#include <cpu/intel/romstage.h>
-void main(unsigned long bist)
+void mainboard_romstage_entry(unsigned long bist)
 {
 	u32 reg32;
 	int s3resume = 0;