northbridge/intel: Rename ram_calc.c to memmap.c

Use a name consistent with the more recent soc/intel.

Change-Id: Ie69583f28f384eb49517203e1c3867f27e6272de
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34699
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

1 files changed, 166 insertions, 0 deletions

diff --git a/src/northbridge/intel/gm45/memmap.c b/src/northbridge/intel/gm45/memmap.c
new file mode 100644
index 0000000000..6795f7a61f
--- /dev/null
+++ b/src/northbridge/intel/gm45/memmap.c
@@ -0,0 +1,166 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 secunet Security Networks AG
+ *
+ * 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.
+ */
+
+// Use simple device model for this file even in ramstage
+#define __SIMPLE_DEVICE__
+
+#include <stdint.h>
+#include <arch/cpu.h>
+#include <device/pci_ops.h>
+#include <device/pci_def.h>
+#include <console/console.h>
+#include <cpu/intel/romstage.h>
+#include <cpu/x86/mtrr.h>
+#include <cbmem.h>
+#include <program_loading.h>
+#include <stage_cache.h>
+#include <cpu/intel/smm/gen1/smi.h>
+#include "gm45.h"
+
+/*
+ * Decodes used Graphics Mode Select (GMS) to kilobytes.
+ * The options for 1M, 4M, 8M and 16M preallocated igd memory are
+ * undocumented but are verified to work.
+ */
+u32 decode_igd_memory_size(const u32 gms)
+{
+	static const u16 ggc2uma[] = { 0, 1, 4, 8, 16, 32, 48, 64, 128, 256,
+				       96, 160, 224, 352 };
+
+	if (gms >= ARRAY_SIZE(ggc2uma))
+		die("Bad Graphics Mode Select (GMS) setting.\n");
+
+	return ggc2uma[gms] << 10;
+}
+
+/** Decodes used Graphics Stolen Memory (GSM) to kilobytes. */
+u32 decode_igd_gtt_size(const u32 gsm)
+{
+	switch (gsm) {
+	case 0:
+		return 0 << 10;
+	case 1:
+		return 1 << 10;
+	case 3:
+	case 9:
+		return 2 << 10;
+	case 10:
+		return 3 << 10;
+	case 11:
+		return 4 << 10;
+	default:
+		die("Bad Graphics Stolen Memory (GSM) setting.\n");
+		return 0;
+	}
+}
+
+/* Decodes TSEG region size to kilobytes. */
+u32 decode_tseg_size(u8 esmramc)
+{
+	if (!(esmramc & 1))
+		return 0;
+	switch ((esmramc >> 1) & 3) {
+	case 0:
+		return 1 << 10;
+	case 1:
+		return 2 << 10;
+	case 2:
+		return 8 << 10;
+	case 3:
+	default:
+		die("Bad TSEG setting.\n");
+	}
+}
+
+u32 northbridge_get_tseg_base(void)
+{
+	const pci_devfn_t dev = PCI_DEV(0, 0, 0);
+
+	u32 tor;
+
+	/* Top of Lower Usable DRAM */
+	tor = (pci_read_config16(dev, D0F0_TOLUD) & 0xfff0) << 16;
+
+	/* Graphics memory comes next */
+	const u32 ggc = pci_read_config16(dev, D0F0_GGC);
+	const u8 esmramc = pci_read_config8(dev, D0F0_ESMRAMC);
+	if (!(ggc & 2)) {
+		/* Graphics memory */
+		tor -= decode_igd_memory_size((ggc >> 4) & 0xf) << 10;
+		/* GTT Graphics Stolen Memory Size (GGMS) */
+		tor -= decode_igd_gtt_size((ggc >> 8) & 0xf) << 10;
+	}
+	/* TSEG size */
+	tor -= decode_tseg_size(esmramc) << 10;
+	return tor;
+}
+
+u32 northbridge_get_tseg_size(void)
+{
+	const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), D0F0_ESMRAMC);
+	return decode_tseg_size(esmramc) << 10;
+}
+
+/* Depending of UMA and TSEG configuration, TSEG might start at any
+ * 1 MiB alignment. As this may cause very greedy MTRR setup, push
+ * CBMEM top downwards to 4 MiB boundary.
+ */
+void *cbmem_top(void)
+{
+	uintptr_t top_of_ram = ALIGN_DOWN(northbridge_get_tseg_base(), 4*MiB);
+	return (void *) top_of_ram;
+}
+
+void stage_cache_external_region(void **base, size_t *size)
+{
+	/* The stage cache lives at the end of the TSEG region.
+	 * The top of RAM is defined to be the TSEG base address.
+	 */
+	*size = CONFIG_SMM_RESERVED_SIZE;
+	*base = (void *)((uintptr_t)northbridge_get_tseg_base()
+		+ northbridge_get_tseg_size() - CONFIG_SMM_RESERVED_SIZE);
+}
+
+/* platform_enter_postcar() determines the stack to use after
+ * cache-as-ram is torn down as well as the MTRR settings to use,
+ * and continues execution in postcar stage. */
+void platform_enter_postcar(void)
+{
+	struct postcar_frame pcf;
+	uintptr_t top_of_ram;
+
+	if (postcar_frame_init(&pcf, 0))
+		die("Unable to initialize postcar frame.\n");
+
+	/* Cache the ROM as WP just below 4GiB. */
+	postcar_frame_add_romcache(&pcf, MTRR_TYPE_WRPROT);
+
+	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
+	postcar_frame_add_mtrr(&pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
+
+	/* Cache 8 MiB region below the top of ram and 2 MiB above top of
+	 * ram to cover both cbmem as the TSEG region.
+	 */
+	top_of_ram = (uintptr_t)cbmem_top();
+	postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 8*MiB,
+			       MTRR_TYPE_WRBACK);
+	postcar_frame_add_mtrr(&pcf, northbridge_get_tseg_base(),
+			       northbridge_get_tseg_size(), MTRR_TYPE_WRBACK);
+
+	run_postcar_phase(&pcf);
+
+	/* We do not return here. */
+}