arch/mips: Pass cbmem_top to ramstage via calling argument

This allows to use a common cbmem_top implementation.

Change-Id: I85efe3899607854c36d0ec594868f690eb724a7f
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36421
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/arch/mips/Kconfig

@@ -22,6 +22,7 @@ config ARCH_BOOTBLOCK_MIPS
 	default n
 	select BOOTBLOCK_CUSTOM
 	select C_ENVIRONMENT_BOOTBLOCK
+	select RAMSTAGE_CBMEM_TOP_ARG
 
 config ARCH_VERSTAGE_MIPS
 	bool

src/arch/mips/include/arch/stages.h

@@ -14,8 +14,9 @@
 #ifndef __MIPS_ARCH_STAGES_H
 #define __MIPS_ARCH_STAGES_H
 
+#include <stdint.h>
 #include <main_decl.h>
 
-void stage_entry(void);
+void stage_entry(uintptr_t stage_arg);
 
 #endif /* __MIPS_ARCH_STAGES_H */

src/arch/mips/stages.c

@@ -11,10 +11,13 @@
  * GNU General Public License for more details.
  */
 
+#include <cbmem.h>
 #include <arch/stages.h>
 #include <arch/cache.h>
 
-void stage_entry(void)
+void stage_entry(uintptr_t stage_arg)
 {
+	if (!ENV_ROMSTAGE_OR_BEFORE)
+		_cbmem_top_ptr = stage_arg;
 	main();
 }

src/soc/imgtec/pistachio/Makefile.inc

@@ -28,7 +28,6 @@ ramstage-y += uart.c
 
 bootblock-y += monotonic_timer.c
 
-ramstage-y += cbmem.c
 ramstage-y += monotonic_timer.c
 ramstage-y += soc.c
 ramstage-y += reset.c