/* * 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; } }