haswell: use asmlinkage for assembly-called funcs

When the haswell MP/SMM code was developed it was using a coreboot
repository that did not contain the asmlinkage macro. Now that the
asmlinkage macro exists use it.

BUG=None
BRANCH=None
TEST=Built and booted.

Change-Id: I662f1b16d1777263b96a427334fff8f98a407755
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/3203
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/cpu/intel/haswell/haswell.h

@@ -22,6 +22,8 @@
 #ifndef _CPU_INTEL_HASWELL_H
 #define _CPU_INTEL_HASWELL_H
 
+#include <arch/cpu.h>
+
 /* Haswell bus clock is fixed at 100MHz */
 #define HASWELL_BCLK		100
 
@@ -148,7 +150,7 @@ void romstage_common(const struct romstage_params *params);
  *  +32: MTTR mask 1 63:32
  *  ...
  */
-void * __attribute__((regparm(0))) romstage_main(unsigned long bist);
+void * asmlinkage romstage_main(unsigned long bist);
 /* romstage_after_car() is the C function called after cache-as-ram has
  * been torn down. It is responsible for loading the ramstage. */
 void romstage_after_car(void);

src/cpu/intel/haswell/mp_init.c

@@ -150,8 +150,7 @@ static void cleanup_rom_caching(void)
 
 /* By the time APs call ap_init() caching has been setup, and microcode has
  * been loaded. */
-static void __attribute__((cdecl))
-ap_init(unsigned int cpu, void *microcode_ptr)
+static void asmlinkage ap_init(unsigned int cpu, void *microcode_ptr)
 {
 	struct cpu_info *info;
 

src/cpu/intel/haswell/romstage.c

@@ -162,7 +162,7 @@ static void *setup_romstage_stack_after_car(void)
 	return slot;
 }
 
-void * __attribute__((regparm(0))) romstage_main(unsigned long bist)
+void * asmlinkage romstage_main(unsigned long bist)
 {
 	int i;
 	void *romstage_stack_after_car;

src/cpu/intel/haswell/smmrelocate.c

@@ -164,7 +164,7 @@ static int bsp_setup_msr_save_state(struct smm_relocation_params *relo_params)
 /* The relocation work is actually performed in SMM context, but the code
  * resides in the ramstage module. This occurs by trampolining from the default
  * SMRAM entry point to here. */
-static void __attribute__((cdecl))
+static void asmlinkage
 cpu_smm_do_relocation(void *arg, int cpu, const struct smm_runtime *runtime)
 {
 	msr_t mtrr_cap;