ACPI S3 support: Add acpi_s3_resume_allowed()

Add this to reduce the amount of preprocessor conditionals used in the source,
compiler currently resolves this to a constant.

Once we have gone through all #if CONFIG_HAVE_ACPI_RESUME cases, we may change
the implementation to enable/disable S3 support runtime.

Change-Id: I0e2d9f81e2ab87c2376a04fab38a7c951cac7a07
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6060
Tested-by: build bot (Jenkins)

src/include/cbmem.h

@@ -21,11 +21,18 @@
 #ifndef _CBMEM_H_
 #define _CBMEM_H_
 
-#if CONFIG_HAVE_ACPI_RESUME
-#if CONFIG_RELOCATABLE_RAMSTAGE
-#define HIGH_MEMORY_SAVE	0
-#else
+#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME) && \
+	! IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE)
 #define HIGH_MEMORY_SAVE	(CONFIG_RAMTOP - CONFIG_RAMBASE)
+#else
+#define HIGH_MEMORY_SAVE	0
+#endif
+
+#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME) && \
+	IS_ENABLED(CONFIG_HIGH_SCRATCH_MEMORY_SIZE)
+#define HIGH_MEMORY_SCRATCH	CONFIG_HIGH_SCRATCH_MEMORY_SIZE
+#else
+#define HIGH_MEMORY_SCRATCH	0
 #endif
 
 /* Delegation of resume backup memory so we don't have to
@@ -33,7 +40,6 @@
  */
 #define CBMEM_BOOT_MODE		0x610
 #define CBMEM_RESUME_BACKUP	0x614
-#endif /* CONFIG_HAVE_ACPI_RESUME */
 
 #define CBMEM_ID_FREESPACE	0x46524545
 #define CBMEM_ID_GDT		0x4c474454
@@ -133,14 +139,9 @@ u64 cbmem_entry_size(const struct cbmem_entry *entry);
  */
 #define _CBMEM_SZ_MINIMAL	( 128 * 1024 )
 
-#if CONFIG_HAVE_ACPI_RESUME
-#define _CBMEM_SZ_RESUME	(HIGH_MEMORY_SAVE + CONFIG_HIGH_SCRATCH_MEMORY_SIZE)
-#else
-#define _CBMEM_SZ_RESUME	0
-#endif
-
 #define _CBMEM_SZ_TOTAL	\
-	(_CBMEM_SZ_MINIMAL + _CBMEM_SZ_RESUME + CONFIG_CONSOLE_CBMEM_BUFFER_SIZE)
+	(_CBMEM_SZ_MINIMAL + CONFIG_CONSOLE_CBMEM_BUFFER_SIZE + \
+	HIGH_MEMORY_SAVE + HIGH_MEMORY_SCRATCH)
 
 #define HIGH_MEMORY_SIZE	ALIGN_UP(_CBMEM_SZ_TOTAL, 0x10000)