cpu/amd/model_10xxx: Move GFXUMA size calculation to separate function

This is required for early CBMEM support.

Change-Id: I31d9b6a04ef963a7d3e045d9c5201ae64604218a
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/8663
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/cpu/amd/model_10xxx/Makefile.inc

@@ -3,6 +3,8 @@ ramstage-y += model_10xxx_init.c
 ramstage-y += processor_name.c
 
 romstage-y += update_microcode.c
+romstage-y += ram_calc.c
+ramstage-y += ram_calc.c
 ramstage-y += monotonic_timer.c
 ramstage-$(CONFIG_HAVE_ACPI_TABLES) += powernow_acpi.c
 

src/cpu/amd/model_10xxx/ram_calc.c

@@ -0,0 +1,43 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
+ * Copyright (C) 2007 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <cpu/cpu.h>
+#include <cpu/x86/msr.h>
+#include <cpu/amd/mtrr.h>
+
+#include "ram_calc.h"
+
+uint64_t get_uma_memory_size(uint64_t topmem)
+{
+	uint64_t uma_size = 0;
+	if (IS_ENABLED(CONFIG_GFXUMA)) {
+		/* refer to UMA Size Consideration in 780 BDG. */
+		if (topmem > 0x40000000)	/* 1GB and above system memory */
+			uma_size = 0x10000000;	/* 256M recommended UMA */
+
+		else if (topmem > 0x20000000)	/* 512M - 1023M system memory */
+			uma_size = 0x8000000;	/* 128M recommended UMA */
+
+		else if (topmem > 0x10000000)	/* 256M - 511M system memory */
+			uma_size = 0x4000000;	/* 64M recommended UMA */
+	}
+
+	return uma_size;
+}

src/cpu/amd/model_10xxx/ram_calc.h

@@ -0,0 +1,25 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _AMD_MODEL_10XXX_RAM_CALC_H_
+#define _AMD_MODEL_10XXX_RAM_CALC_H_
+
+uint64_t get_uma_memory_size(uint64_t topmem);
+
+#endif

src/northbridge/amd/amdfam10/northbridge.c

@@ -33,6 +33,7 @@
 #include <cpu/x86/lapic.h>
 #include <cpu/amd/mtrr.h>
 #include <cpu/amd/amdfam10_sysconf.h>
+#include <cpu/amd/model_10xxx/ram_calc.h>
 
 #if CONFIG_LOGICAL_CPUS
 #include <cpu/amd/multicore.h>
@@ -740,21 +741,7 @@ static void setup_uma_memory(void)
 {
 #if CONFIG_GFXUMA
 	uint32_t topmem = (uint32_t) bsp_topmem();
-	/* refer to UMA Size Consideration in 780 BDG. */
+	uma_memory_size = get_uma_memory_size(topmem);
-	switch (topmem) {
-	case 0x10000000:	/* 256M system memory */
-		uma_memory_size = 0x4000000;	/* 64M recommended UMA */
-		break;
-
-	case 0x20000000:	/* 512M system memory */
-		uma_memory_size = 0x8000000;	/* 128M recommended UMA */
-		break;
-
-	default:		/* 1GB and above system memory */
-		uma_memory_size = 0x10000000;	/* 256M recommended UMA */
-		break;
-	}
-
 	uma_memory_base = topmem - uma_memory_size;	/* TOP_MEM1 */
 	printk(BIOS_INFO, "%s: uma size 0x%08llx, memory start 0x%08llx\n",
 		    __func__, uma_memory_size, uma_memory_base);