cpu/intel/microcode: allow microcode to be loaded in romstage

The previous usage of the intel microcode support supported using
the library under ROMCC and ramstage. Allow for microcode support
to be used in normal C-based romstage as well by:

1. Only using walkcbfs when ROMCC is defined.
2. Only using spinlocks if !__PRE_RAM__

The header file now unconditionally exposes the declarations
of the supporting functions.

Change-Id: I903578bcb4422b4c050903c53b60372b64b79af1
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/13611
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/cpu/intel/microcode/Makefile.inc

@@ -3,3 +3,4 @@
 ## directly from CBFS. You have been WARNED!!!
 ################################################################################
 ramstage-$(CONFIG_SUPPORT_CPU_UCODE_IN_CBFS) += microcode.c
+romstage-$(CONFIG_SUPPORT_CPU_UCODE_IN_CBFS) += microcode.c

src/cpu/intel/microcode/microcode.c

@@ -19,7 +19,10 @@
 #include <stdint.h>
 #include <stddef.h>
 #if !defined(__ROMCC__)
+#include <cbfs.h>
 #include <console/console.h>
+#else
+#include <arch/cbfs.h>
 #endif
 #include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
@@ -27,11 +30,8 @@
 #include <rules.h>
 
 #if !defined(__PRE_RAM__)
-#include <cbfs.h>
 #include <smp/spinlock.h>
 DECLARE_SPIN_LOCK(microcode_lock)
-#else
-#include <arch/cbfs.h>
 #endif
 
 struct microcode {
@@ -121,7 +121,7 @@ const void *intel_microcode_find(void)
 	unsigned int x86_model, x86_family;
 	msr_t msr;
 
-#ifdef __PRE_RAM__
+#ifdef __ROMCC__
 	struct cbfs_file *microcode_file;
 
 	microcode_file = walkcbfs_head((char *) MICROCODE_CBFS_FILE);

src/include/cpu/intel/microcode.h

@@ -16,7 +16,8 @@
 #ifndef __CPU__INTEL__MICROCODE__
 #define __CPU__INTEL__MICROCODE__
 
-#ifndef __PRE_RAM__
+#include <stdint.h>
+
 void intel_update_microcode_from_cbfs(void);
 /* Find a microcode that matches the revision and platform family returning
  * NULL if none found. */
@@ -29,6 +30,5 @@ void intel_microcode_load_unlocked(const void *microcode_patch);
 /* SoC specific check to determine if microcode update is really
  * required, will skip microcode update if true. */
 int soc_skip_ucode_update(u32 currrent_patch_id, u32 new_patch_id);
-#endif
 
 #endif