amd: raminit sysinfo offset fix

The sysinfo object within the k8 ram init is used
to communicate progess/status from all the nodes in the
system. However, the code was assuming where the sysinfo
object lived in cache-as-ram. The layout of cache-as-ram
is dynamic so one needs to do the lookup of the correct
address at runtime. The way the amd code is compiled
by #include'ing .c files makes the solution a little
more complex in that some cache-as-ram support code
needed to be refactored.

Change-Id: I6500fa7b005dc082c4c0b3382ee2c3a138d9ac31
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10961
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/arch/x86/include/arch/early_variables.h

@@ -20,6 +20,8 @@
 #ifndef ARCH_EARLY_VARIABLES_H
 #define ARCH_EARLY_VARIABLES_H
 
+#include <stdlib.h>
+
 #if defined(__PRE_RAM__) && IS_ENABLED(CONFIG_CACHE_AS_RAM)
 asm(".section .car.global_data,\"w\",@nobits");
 asm(".previous");
@@ -43,6 +45,20 @@ void *car_sync_var_ptr(void *var);
 #define car_set_var(var, val) \
 	do { car_get_var(var) = (val); } while(0)
 
+extern char _car_data_start[];
+extern char _car_data_end[];
+
+static inline size_t car_data_size(void)
+{
+	size_t car_size = &_car_data_end[0] - &_car_data_start[0];
+	return ALIGN(car_size, 64);
+}
+
+static inline size_t car_object_offset(void *ptr)
+{
+	return (char *)ptr - &_car_data_start[0];
+}
+
 #else
 #define CAR_GLOBAL
 static inline void *car_get_var_ptr(void *var) { return var; }

src/cpu/amd/car/post_cache_as_ram.c

@@ -3,6 +3,7 @@
  */
 #include <string.h>
 #include <arch/stages.h>
+#include <arch/early_variables.h>
 #include <cpu/x86/mtrr.h>
 #include <cpu/amd/mtrr.h>
 #include <cpu/amd/car.h>
@@ -22,18 +23,9 @@
 #define print_car_debug(x)
 #endif
 
-extern char _car_data_start[];
-extern char _car_data_end[];
-
-static size_t car_data_size(void)
-{
-	size_t car_size = &_car_data_end[0] - &_car_data_start[0];
-	return ALIGN(car_size, 64);
-}
-
 static size_t backup_size(void)
 {
-	size_t car_size = &_car_data_end[0] - &_car_data_start[0];
+	size_t car_size = car_data_size();
 	return ALIGN(car_size + 1024, 1024);
 }
 

src/cpu/x86/car.c

@@ -30,9 +30,6 @@ typedef void (* const car_migration_func_t)(void);
 
 extern car_migration_func_t _car_migrate_start;
 
-extern char _car_data_start[];
-extern char _car_data_end[];
-
 /*
  * The car_migrated global variable determines if the cache-as-ram space has
  * been migrated to real RAM. It does this by assuming the following things:
@@ -117,20 +114,20 @@ void *car_sync_var_ptr(void *var)
 static void do_car_migrate_variables(void)
 {
 	void *migrated_base;
-	size_t car_data_size = &_car_data_end[0] - &_car_data_start[0];
+	size_t car_size = car_data_size();
 
 	/* Check if already migrated. */
 	if (car_migrated)
 		return;
 
-	migrated_base = cbmem_add(CBMEM_ID_CAR_GLOBALS, car_data_size);
+	migrated_base = cbmem_add(CBMEM_ID_CAR_GLOBALS, car_size);
 
 	if (migrated_base == NULL) {
 		printk(BIOS_ERR, "Could not migrate CAR data!\n");
 		return;
 	}
 
-	memcpy(migrated_base, &_car_data_start[0], car_data_size);
+	memcpy(migrated_base, &_car_data_start[0], car_size);
 
 	/* Mark that the data has been moved. */
 	car_migrated = ~0;

src/northbridge/amd/amdk8/f.h

@@ -519,7 +519,8 @@ struct sys_info {
 } __attribute__((packed));
 
 #ifdef __PRE_RAM__
-extern struct sys_info sysinfo_car;
+#include <arch/early_variables.h>
+struct sys_info sysinfo_car CAR_GLOBAL;
 #endif
 
 #include <reset.h>

src/northbridge/amd/amdk8/pre_f.h

@@ -263,7 +263,8 @@ struct sys_info {
 } __attribute__((packed));
 
 #ifdef __PRE_RAM__
-extern struct sys_info sysinfo_car;
+#include <arch/early_variables.h>
+struct sys_info sysinfo_car CAR_GLOBAL;
 #endif
 
 #endif /* AMDK8_PRE_F_H */

src/northbridge/amd/amdk8/raminit.c

@@ -17,9 +17,6 @@
 #include "option_table.h"
 #endif
 
-#include <arch/early_variables.h>
-struct sys_info sysinfo_car CAR_GLOBAL;
-
 void setup_resource_map(const unsigned int *register_values, int max)
 {
 	int i;

src/northbridge/amd/amdk8/raminit_f.c

@@ -42,9 +42,6 @@
 #endif
 
 
-#include <arch/early_variables.h>
-struct sys_info sysinfo_car CAR_GLOBAL;
-
 #include "f_pci.c"
 
 

src/northbridge/amd/amdk8/raminit_f_dqs.c

@@ -2074,7 +2074,11 @@ static void train_ram(unsigned nodeid, struct sys_info *sysinfo, struct sys_info
 static inline void train_ram_on_node(unsigned nodeid, unsigned coreid, struct sys_info *sysinfo, unsigned retcall)
 {
 	if(coreid) return; // only do it on core0
-	struct sys_info *sysinfox = (void *)((CONFIG_RAMTOP) - sizeof(*sysinfox));
+	struct sys_info *sysinfox;
+	uintptr_t migrated_base = CONFIG_RAMTOP - car_data_size();
+
+	sysinfox = (void *)(migrated_base + car_object_offset(&sysinfo_car));
+
 	wait_till_sysinfo_in_ram(); // use pci to get it
 
 	if(sysinfox->mem_trained[nodeid] == 0x80) {