86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <dimm_info_util.h>
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#include <smbios.h>
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#include <spd.h>
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#include <console/console.h>
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uint8_t smbios_bus_width_to_spd_width(uint16_t total_width, uint16_t data_width)
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{
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uint8_t out;
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/* Lookup table as defined in the JEDEC Standard. */
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switch (data_width) {
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case 64:
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out = MEMORY_BUS_WIDTH_64;
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break;
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case 32:
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out = MEMORY_BUS_WIDTH_32;
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break;
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case 16:
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out = MEMORY_BUS_WIDTH_16;
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break;
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case 8:
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out = MEMORY_BUS_WIDTH_8;
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break;
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default:
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printk(BIOS_NOTICE, "Unknown memory size %hu", data_width);
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/*
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* The SMBIOS spec says we should set 0xFFFF on an unknown
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* value, but we don't have a way of passing that signal via SPD
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* encoded values.
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*/
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out = MEMORY_BUS_WIDTH_8;
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break;
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}
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uint16_t extension_bits = total_width - data_width;
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switch (extension_bits) {
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case 8:
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out |= SPD_ECC_8BIT;
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break;
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case 0:
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/* No extension bits */
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break;
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default:
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printk(BIOS_NOTICE, "Unknown number of extension bits %hu",
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extension_bits);
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break;
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}
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return out;
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}
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uint32_t smbios_memory_size_to_mib(uint16_t memory_size, uint32_t extended_size)
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{
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/* Memory size is unknown */
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if (memory_size == 0xFFFF)
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return 0;
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/* (32 GiB - 1 MiB) or greater is expressed in the extended size. */
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else if (memory_size == 0x7FFF)
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return extended_size;
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/* When the MSB is flipped, the value is specified in kilobytes */
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else if (memory_size & 0x8000)
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return (memory_size ^ 0x8000) / KiB;
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/* Value contains MiB */
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else
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return memory_size;
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}
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uint8_t
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smbios_form_factor_to_spd_mod_type(smbios_memory_form_factor form_factor)
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{
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/* This switch reverses the switch in smbios.c */
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switch (form_factor) {
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case MEMORY_FORMFACTOR_DIMM:
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return SPD_UDIMM;
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case MEMORY_FORMFACTOR_RIMM:
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return SPD_RDIMM;
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case MEMORY_FORMFACTOR_SODIMM:
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return SPD_SODIMM;
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default:
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return SPD_UNDEFINED;
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}
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}
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