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-rw-r--r--src/lib/Makefile.inc1
-rw-r--r--src/lib/dimm_info_util.c98
2 files changed, 99 insertions, 0 deletions
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index 960b5cbec3..99322dcc76 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -110,6 +110,7 @@ ramstage-y += memchr.c
ramstage-y += memcmp.c
ramstage-y += malloc.c
smm-$(CONFIG_SMM_TSEG) += malloc.c
+ramstage-y += dimm_info_util.c
ramstage-y += delay.c
ramstage-y += fallback_boot.c
ramstage-y += compute_ip_checksum.c
diff --git a/src/lib/dimm_info_util.c b/src/lib/dimm_info_util.c
new file mode 100644
index 0000000000..a7fcca25cc
--- /dev/null
+++ b/src/lib/dimm_info_util.c
@@ -0,0 +1,98 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC.
+ *
+ * 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.
+ */
+
+#include <dimm_info_util.h>
+#include <smbios.h>
+#include <spd.h>
+#include <console/console.h>
+
+uint8_t smbios_bus_width_to_spd_width(uint16_t total_width, uint16_t data_width)
+{
+ uint8_t out;
+
+ /* Lookup table as defined in the JEDEC Standard. */
+ switch (data_width) {
+ case 64:
+ out = MEMORY_BUS_WIDTH_64;
+ break;
+ case 32:
+ out = MEMORY_BUS_WIDTH_32;
+ break;
+ case 16:
+ out = MEMORY_BUS_WIDTH_16;
+ break;
+ case 8:
+ out = MEMORY_BUS_WIDTH_8;
+ break;
+ default:
+ printk(BIOS_NOTICE, "Unknown memory size %hu", data_width);
+ /*
+ * The SMBIOS spec says we should set 0xFFFF on an unknown
+ * value, but we don't have a way of passing that signal via SPD
+ * encoded values.
+ */
+ out = MEMORY_BUS_WIDTH_8;
+ break;
+ }
+
+ uint16_t extension_bits = total_width - data_width;
+
+ switch (extension_bits) {
+ case 8:
+ out |= SPD_ECC_8BIT;
+ break;
+ case 0:
+ /* No extension bits */
+ break;
+ default:
+ printk(BIOS_NOTICE, "Unknown number of extension bits %hu",
+ extension_bits);
+ break;
+ }
+
+ return out;
+}
+
+uint32_t smbios_memory_size_to_mib(uint16_t memory_size, uint32_t extended_size)
+{
+ /* Memory size is unknown */
+ if (memory_size == 0xFFFF)
+ return 0;
+ /* (32 GiB - 1 MiB) or greater is expressed in the extended size. */
+ else if (memory_size == 0x7FFF)
+ return extended_size;
+ /* When the MSB is flipped, the value is specified in kilobytes */
+ else if (memory_size & 0x8000)
+ return (memory_size ^ 0x8000) / KiB;
+ /* Value contains MiB */
+ else
+ return memory_size;
+}
+
+uint8_t
+smbios_form_factor_to_spd_mod_type(smbios_memory_form_factor form_factor)
+{
+ /* This switch reverses the switch in smbios.c */
+ switch (form_factor) {
+ case MEMORY_FORMFACTOR_DIMM:
+ return SPD_UDIMM;
+ case MEMORY_FORMFACTOR_RIMM:
+ return SPD_RDIMM;
+ case MEMORY_FORMFACTOR_SODIMM:
+ return SPD_SODIMM;
+ default:
+ return SPD_UNDEFINED;
+ }
+}