x86 SMM: Fix use with RELOCATABLE_RAMSTAGE

The value for _size was not evaluated correctly if ramstage
is relocated, make the calculation runtime.

While touching it, move symbol declarations to header file.

Change-Id: I4402315945771acf1c86a81cac6d43f1fe99a2a2
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17784
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/cpu/amd/smm/smm_init.c

@@ -26,9 +26,6 @@
 #include <cpu/x86/smm.h>
 #include <string.h>
 
-extern unsigned char _binary_smm_start;
-extern unsigned char _binary_smm_size;
-
 void smm_init(void)
 {
 	msr_t msr, syscfg_orig, mtrr_aseg_orig;
@@ -63,7 +60,8 @@ void smm_init(void)
 
 	enable_cache();
 	/* copy the real SMM handler */
-	memcpy((void *)SMM_BASE, &_binary_smm_start, (size_t)&_binary_smm_size);
+	memcpy((void *)SMM_BASE, _binary_smm_start,
+		_binary_smm_end - _binary_smm_start);
 	wbinvd();
 	disable_cache();
 

src/cpu/x86/smm/smm_module_loader.c

@@ -45,9 +45,6 @@ struct smm_stub_params {
  */
 extern unsigned char _binary_smmstub_start[];
 
-/* This is the SMM handler that the stub calls. It is encoded as an rmodule. */
-extern unsigned char _binary_smm_start[];
-
 /* Per CPU minimum stack size. */
 #define SMM_MINIMUM_STACK_SIZE 32
 

src/include/cpu/x86/smm.h

@@ -485,6 +485,10 @@ void mainboard_smi_sleep(u8 slp_typ);
 void smi_release_lock(void);
 #endif
 
+/* This is the SMM handler. */
+extern unsigned char _binary_smm_start[];
+extern unsigned char _binary_smm_end[];
+
 /* Get PMBASE address */
 u16 smm_get_pmbase(void);
 

src/soc/intel/sch/smi.c

@@ -24,9 +24,6 @@
 #include "chip.h"
 #include "sch.h"
 
-extern unsigned char _binary_smm_start;
-extern unsigned char _binary_smm_size;
-
 /* I945 */
 #define SMRAM		0x9d
 #define   D_OPEN	(1 << 6)
@@ -299,7 +296,8 @@ static void smm_install(void)
 				D_OPEN | G_SMRAME | C_BASE_SEG);
 
 	/* copy the real SMM handler */
-	memcpy((void *)0xa0000, &_binary_smm_start, (size_t)&_binary_smm_size);
+	memcpy((void *)0xa0000, _binary_smm_start,
+		_binary_smm_end - _binary_smm_start);
 	wbinvd();
 
 	/* close the SMM memory window and enable normal SMM */

src/southbridge/intel/i82801dx/smi.c

@@ -25,9 +25,6 @@
 #include <string.h>
 #include "i82801dx.h"
 
-extern unsigned char _binary_smm_start;
-extern unsigned char _binary_smm_size;
-
 /* I945 */
 #define SMRAM		0x90
 #define   D_OPEN	(1 << 6)
@@ -321,7 +318,8 @@ static void smm_install(void)
 				D_OPEN | G_SMRAME | C_BASE_SEG);
 
 	/* copy the real SMM handler */
-	memcpy((void *)0xa0000, &_binary_smm_start, (size_t)&_binary_smm_size);
+	memcpy((void *)0xa0000, _binary_smm_start,
+		_binary_smm_end - _binary_smm_start);
 	wbinvd();
 
 	/* close the SMM memory window and enable normal SMM */

src/southbridge/intel/i82801gx/smi.c

@@ -25,9 +25,6 @@
 #include <string.h>
 #include "i82801gx.h"
 
-extern unsigned char _binary_smm_start;
-extern unsigned char _binary_smm_size;
-
 /* I945 */
 #define SMRAM		0x9d
 #define   D_OPEN	(1 << 6)
@@ -345,7 +342,8 @@ static void smm_install(void)
 					D_OPEN | G_SMRAME | C_BASE_SEG);
 
 		/* copy the real SMM handler */
-		memcpy((void *)0xa0000, &_binary_smm_start, (size_t)&_binary_smm_size);
+		memcpy((void *)0xa0000, _binary_smm_start,
+			_binary_smm_end - _binary_smm_start);
 		wbinvd();
 	}
 

src/southbridge/intel/i82801ix/smi.c

@@ -26,9 +26,6 @@
 #include <string.h>
 #include "i82801ix.h"
 
-extern unsigned char _binary_smm_start;
-extern unsigned char _binary_smm_size;
-
 /* I945/GM45 */
 #define SMRAM		0x9d
 #define   D_OPEN	(1 << 6)
@@ -344,7 +341,8 @@ static void smm_install(void)
 					D_OPEN | G_SMRAME | C_BASE_SEG);
 
 		/* copy the real SMM handler */
-		memcpy((void *)0xa0000, &_binary_smm_start, (size_t)&_binary_smm_size);
+		memcpy((void *)0xa0000, _binary_smm_start,
+			_binary_smm_end - _binary_smm_start);
 		wbinvd();
 	}