amdk8/amdfam10: Use CAR_GLOBAL for sysinfo

This gets rid of the somewhat unstructured placement of AMD's
sysinfo structure in CAR.
We used to carve out some CAR space using a Kconfig variable,
and then put sysinfo there manually (by "virtue" of pointer magic).

Now it's a variable with the CAR_GLOBAL qualifier, and build
system magic.

For this, the following steps were done (but must happen together
since the intermediates won't build):
- Add new CAR_GLOBAL sysinfo_car
- point all sysinfo pointers to sysinfo_car instead of GLOBAL_VAR
- remove DCACHE_RAM_GLOBAL_VAR_SIZE
  - from CAR setup (no need to reserve the space)
  - commented out code (that was commented out for years)
  - only copy sizeof(sysinfo) into RAM after ram init, where
    before it copied the whole GLOBAL_VAR area.
  - from Kconfig

Change-Id: I3cbcccd883ca6751326c8e32afde2eb0c91229ed
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/1887
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Marc Jones <marcj303@gmail.com>

3 files changed, 3 insertions, 8 deletions

diff --git a/src/mainboard/gigabyte/ga_2761gxdk/Kconfig b/src/mainboard/gigabyte/ga_2761gxdk/Kconfig
index 7c33e60809..c535294c89 100644
--- a/src/mainboard/gigabyte/ga_2761gxdk/Kconfig
+++ b/src/mainboard/gigabyte/ga_2761gxdk/Kconfig
@@ -32,10 +32,6 @@ config DCACHE_RAM_SIZE
 	hex
 	default 0x08000
 
-config DCACHE_RAM_GLOBAL_VAR_SIZE
-	hex
-	default 0x01000
-
 config APIC_ID_OFFSET
 	hex
 	default 0x10
diff --git a/src/mainboard/gigabyte/ga_2761gxdk/ap_romstage.c b/src/mainboard/gigabyte/ga_2761gxdk/ap_romstage.c
index 28be373b4b..54caf37caa 100644
--- a/src/mainboard/gigabyte/ga_2761gxdk/ap_romstage.c
+++ b/src/mainboard/gigabyte/ga_2761gxdk/ap_romstage.c
@@ -62,8 +62,8 @@
 
 void hardwaremain(int ret_addr)
 {
-	struct sys_info *sysinfo = (CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE - CONFIG_DCACHE_RAM_GLOBAL_VAR_SIZE); // in CACHE
-        struct sys_info *sysinfox = ((CONFIG_RAMTOP) - CONFIG_DCACHE_RAM_GLOBAL_VAR_SIZE); // in RAM
+	struct sys_info *sysinfo = &sysinfo_car; // in CACHE
+        struct sys_info *sysinfox = ((CONFIG_RAMTOP) - sizeof(*sysinfox)); // in RAM
 
 	struct node_core_id id;
 
diff --git a/src/mainboard/gigabyte/ga_2761gxdk/romstage.c b/src/mainboard/gigabyte/ga_2761gxdk/romstage.c
index d9a133bb8b..9a3a79b786 100644
--- a/src/mainboard/gigabyte/ga_2761gxdk/romstage.c
+++ b/src/mainboard/gigabyte/ga_2761gxdk/romstage.c
@@ -118,8 +118,7 @@ void cache_as_ram_main(unsigned long bist, unsigned long cpu_init_detectedx)
 		DIMM5, DIMM7, 0, 0,
 	};
 
-        struct sys_info *sysinfo = (struct sys_info *)(CONFIG_DCACHE_RAM_BASE +
-		CONFIG_DCACHE_RAM_SIZE - CONFIG_DCACHE_RAM_GLOBAL_VAR_SIZE);
+        struct sys_info *sysinfo = &sysinfo_car;
         int needs_reset = 0;
         unsigned bsp_apicid = 0;