blob: 94664b25035f7061cf428ac6feebeac0eb8dcaef [file] [log] [blame] [edit]
// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <inttypes.h>
#include <lib/smbios/smbios.h>
#include <stdio.h>
#include <string.h>
#include <zircon/compiler.h>
#include <zircon/types.h>
#include <algorithm>
#include <iterator>
#include <fbl/algorithm.h>
namespace {
uint8_t ComputeChecksum(const uint8_t* data, size_t len) {
unsigned int sum = 0;
for (size_t i = 0; i < len; ++i) {
sum += data[i];
}
return static_cast<uint8_t>(sum);
}
} // namespace
namespace smbios {
StringTable::StringTable() {}
StringTable::~StringTable() {}
zx_status_t StringTable::Init(const Header* h, size_t max_struct_len) {
if (h->length > max_struct_len) {
return ZX_ERR_IO_DATA_INTEGRITY;
}
size_t max_string_table_len = max_struct_len - h->length;
start_ = reinterpret_cast<const char*>(h) + h->length;
// Make sure the table is big enough to include the two trailing NULs
if (max_string_table_len < 2) {
return ZX_ERR_IO_DATA_INTEGRITY;
}
// Check if the string table is empty
if (start_[0] == 0 && start_[1] == 0) {
length_ = 2;
return ZX_OK;
}
size_t start_idx = 0;
if (start_[0] == 0) {
// We know that this isn't the end of the table, since the next byte
// isn't NUL. Skip examining this leading zero-length string in the
// loop below, so that we can simplify the iteration. During the
// iteration below, we have the invariant that either
// 1) i points to the start of the first string in the table and that
// string is not 0-length
// 2) i points to a subsequent string in the table, so a zero-length
// string implies two consecutive NULs were found (the end of table
// marker).
start_idx = 1;
}
for (size_t i = start_idx; i < max_string_table_len;) {
size_t len = strnlen(start_ + i, max_string_table_len - i);
if (len == 0) {
length_ = i + 1; // Include the trailing null
return ZX_OK;
}
// strnlen returns the length not including the NUL. Note that if
// no NUL was found, it returns max_string_table_len - i, which will exceed
// the loop conditions.
i += len + 1;
}
return ZX_ERR_IO_DATA_INTEGRITY;
}
zx_status_t StringTable::GetString(size_t idx, const char** out) const {
if (idx == 0) {
*out = "<null>";
return ZX_OK;
}
*out = "<missing string>";
for (size_t i = 0; i < length_;) {
size_t len = strnlen(start_ + i, length_ - i);
if (len == 0) {
if (i != 0) {
return ZX_ERR_NOT_FOUND;
}
if (length_ - i < 2) {
return ZX_ERR_IO_DATA_INTEGRITY;
}
if (start_[i + 1] == 0) {
return ZX_ERR_NOT_FOUND;
}
}
if (idx == 1) {
*out = start_ + i;
return ZX_OK;
}
idx--;
i += len + 1;
}
ZX_DEBUG_ASSERT(false);
// Should not be reachable, since Init should have checked
return ZX_ERR_IO_DATA_INTEGRITY;
}
void StringTable::Dump() const {
const char* str;
for (size_t i = 1; GetString(i, &str) == ZX_OK; ++i) {
printf(" str %zu: %s\n", i, str);
}
}
bool EntryPoint2_1::IsValid() const {
if (memcmp(anchor_string, SMBIOS2_ANCHOR, std::size(anchor_string))) {
printf("smbios: bad anchor %4s\n", anchor_string);
return false;
}
uint8_t real_length = length;
if (length != 0x1f) {
// 0x1e is allowed due to errata in the SMBIOS 2.1 spec. It really means
// 0x1f.
if (length == 0x1e) {
real_length = 0x1f;
} else {
printf("smbios: bad len: %u\n", real_length);
return false;
}
}
if (ComputeChecksum(reinterpret_cast<const uint8_t*>(this), real_length) != 0) {
printf("smbios: bad checksum\n");
return false;
}
if (ep_rev != 0) {
printf("smbios: bad version %u\n", ep_rev);
return false;
}
if (memcmp(intermediate_anchor_string, SMBIOS2_INTERMEDIATE_ANCHOR,
std::size(intermediate_anchor_string))) {
printf("smbios: bad intermediate anchor %5s\n", intermediate_anchor_string);
return false;
}
if (ComputeChecksum(reinterpret_cast<const uint8_t*>(&intermediate_anchor_string),
real_length - offsetof(EntryPoint2_1, intermediate_anchor_string)) != 0) {
printf("smbios: bad intermediate checksum\n");
return false;
}
if ((uint32_t)(struct_table_phys + struct_table_length) < struct_table_phys) {
return false;
}
return true;
}
void EntryPoint2_1::Dump() const {
printf("SMBIOS EntryPoint v2.1:\n");
printf(" specification version: %u.%u\n", major_ver, minor_ver);
printf(" max struct size: %u\n", max_struct_size);
printf(" struct table: %u bytes @0x%08x, %u entries\n", struct_table_length, struct_table_phys,
struct_count);
}
bool SpecVersion::IncludesVersion(uint8_t spec_major_ver, uint8_t spec_minor_ver) const {
if (major_ver > spec_major_ver) {
return true;
}
if (major_ver < spec_major_ver) {
return false;
}
return minor_ver >= spec_minor_ver;
}
void BiosInformationStruct2_0::Dump(const StringTable& st) const {
printf("SMBIOS BIOS Information Struct v2.0:\n");
printf(" vendor: %s\n", st.GetString(vendor_str_idx));
printf(" BIOS version: %s\n", st.GetString(bios_version_str_idx));
printf(" BIOS starting address segment: 0x%04x\n", bios_starting_address_segment);
printf(" BIOS release date: %s\n", st.GetString(bios_release_date_str_idx));
printf(" BIOS ROM size: 0x%02x\n", bios_rom_size);
printf(" BIOS characteristics: 0x%016" PRIx64 "\n", bios_characteristics);
for (size_t i = sizeof(*this); i < hdr.length; ++i) {
printf(" BIOS characteristics extended: 0x%02x\n", bios_characteristics_ext[i]);
}
}
void BiosInformationStruct2_4::Dump(const StringTable& st) const {
printf("SMBIOS BIOS Information Struct v2.4:\n");
printf(" vendor: %s\n", st.GetString(vendor_str_idx));
printf(" BIOS version: %s\n", st.GetString(bios_version_str_idx));
printf(" BIOS starting address segment: 0x%04x\n", bios_starting_address_segment);
printf(" BIOS release date: %s\n", st.GetString(bios_release_date_str_idx));
printf(" BIOS ROM size: 0x%02x\n", bios_rom_size);
printf(" BIOS characteristics: 0x%016" PRIx64 "\n", bios_characteristics);
printf(" BIOS characteristics extended: 0x%04x\n", bios_characteristics_ext);
printf(" BIOS version number: %u.%u\n", bios_major_release, bios_minor_release);
printf(" EC version number: %u.%u\n", ec_major_release, ec_minor_release);
if (hdr.length > sizeof(*this)) {
printf(" %zu bytes of unknown trailing contents\n", hdr.length - sizeof(*this));
}
}
void SystemInformationStruct2_0::Dump(const StringTable& st) const {
printf("SMBIOS System Information Struct v2.0:\n");
printf(" manufacturer: %s\n", st.GetString(manufacturer_str_idx));
printf(" product: %s\n", st.GetString(product_name_str_idx));
printf(" version: %s\n", st.GetString(version_str_idx));
if (hdr.length > sizeof(*this)) {
printf(" %zu bytes of unknown trailing contents\n", hdr.length - sizeof(*this));
}
}
void SystemInformationStruct2_1::Dump(const StringTable& st) const {
printf("SMBIOS System Information Struct v2.1:\n");
printf(" manufacturer: %s\n", st.GetString(manufacturer_str_idx));
printf(" product: %s\n", st.GetString(product_name_str_idx));
printf(" version: %s\n", st.GetString(version_str_idx));
printf(" wakeup_type: 0x%x\n", wakeup_type);
if (hdr.length > sizeof(*this)) {
printf(" %zu bytes of unknown trailing contents\n", hdr.length - sizeof(*this));
}
}
void SystemInformationStruct2_4::Dump(const StringTable& st) const {
printf("SMBIOS System Information Struct v2.4:\n");
printf(" manufacturer: %s\n", st.GetString(manufacturer_str_idx));
printf(" product: %s\n", st.GetString(product_name_str_idx));
printf(" version: %s\n", st.GetString(version_str_idx));
printf(" wakeup_type: 0x%x\n", wakeup_type);
printf(" SKU: %s\n", st.GetString(sku_number_str_idx));
printf(" family: %s\n", st.GetString(family_str_idx));
if (hdr.length > sizeof(*this)) {
printf(" %zu bytes of unknown trailing contents\n", hdr.length - sizeof(*this));
}
}
#ifndef _KERNEL
void BaseboardInformationStruct::Dump(const StringTable& st) const {
printf("SMBIOS Baseboard Information Struct:\n");
printf(" manufacturer: %s\n", st.GetString(manufacturer_str_idx));
printf(" product: %s\n", st.GetString(product_name_str_idx));
printf(" version: %s\n", st.GetString(version_str_idx));
printf(" feature flags (%spresent): 0x%02x\n", feature_flags().has_value() ? "" : "not ",
feature_flags().value_or(0));
printf(" location: %s\n", st.GetString(location_in_chassis_str_idx().value_or(0)));
printf(" board_type (%spresent): 0x%02x\n", board_type().has_value() ? "" : "not ",
board_type().value_or(0));
}
#endif
zx_status_t EntryPoint2_1::WalkStructs(uintptr_t struct_table_virt, StructWalkCallback cb) const {
size_t idx = 0;
uintptr_t curr_addr = struct_table_virt;
const uintptr_t table_end = curr_addr + struct_table_length;
while (curr_addr + sizeof(Header) < table_end) {
auto hdr = reinterpret_cast<const Header*>(curr_addr);
if (curr_addr + hdr->length > table_end) {
return ZX_ERR_IO_DATA_INTEGRITY;
}
StringTable st;
zx_status_t status =
st.Init(hdr, std::max(table_end - curr_addr, static_cast<size_t>(max_struct_size)));
if (status != ZX_OK) {
return status;
}
status = cb(version(), hdr, st);
if (status == ZX_ERR_STOP) {
return ZX_OK;
} else if (status != ZX_OK && status != ZX_ERR_NEXT) {
return status;
}
idx++;
if (idx == struct_count) {
return ZX_OK;
}
// Skip over the embedded strings
curr_addr += hdr->length + st.length();
}
return ZX_ERR_IO_DATA_INTEGRITY;
}
} // namespace smbios