| // Copyright 2017 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| // |
| #include <platform/pc/smbios.h> |
| |
| #include <fbl/auto_call.h> |
| #include <ktl/move.h> |
| #include <lib/console.h> |
| #include <lib/smbios/smbios.h> |
| #include <platform/pc/bootloader.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <vm/physmap.h> |
| #include <vm/vm_address_region.h> |
| #include <vm/vm_aspace.h> |
| #include <vm/vm_object_physical.h> |
| #include <zircon/compiler.h> |
| #include <zircon/types.h> |
| |
| namespace { |
| |
| smbios::EntryPointVersion kEpVersion = smbios::EntryPointVersion::Unknown; |
| union { |
| const uint8_t* raw; |
| const smbios::EntryPoint2_1* ep2_1; |
| } kEntryPoint; |
| uintptr_t kStructBase = 0; // Address of first SMBIOS struct |
| |
| zx_status_t FindEntryPoint(const uint8_t** base, smbios::EntryPointVersion* version) { |
| // See if our bootloader told us where the table is |
| if (bootloader.smbios != 0) { |
| const uint8_t* p = reinterpret_cast<const uint8_t*>(paddr_to_physmap(bootloader.smbios)); |
| if (!memcmp(p, SMBIOS2_ANCHOR, strlen(SMBIOS2_ANCHOR))) { |
| *base = p; |
| *version = smbios::EntryPointVersion::V2_1; |
| return ZX_OK; |
| } else if (!memcmp(p, SMBIOS3_ANCHOR, strlen(SMBIOS3_ANCHOR))) { |
| *base = p; |
| *version = smbios::EntryPointVersion::V3_0; |
| return ZX_OK; |
| } |
| } |
| |
| // Fallback to non-EFI SMBIOS search if we haven't found it yet |
| for (paddr_t target = 0x000f0000; target < 0x00100000; target += 16) { |
| const uint8_t* p = reinterpret_cast<const uint8_t*>(paddr_to_physmap(target)); |
| if (!memcmp(p, SMBIOS2_ANCHOR, strlen(SMBIOS2_ANCHOR))) { |
| *base = p; |
| *version = smbios::EntryPointVersion::V2_1; |
| return ZX_OK; |
| } |
| if (!memcmp(p, SMBIOS3_ANCHOR, strlen(SMBIOS3_ANCHOR))) { |
| *base = p; |
| *version = smbios::EntryPointVersion::V3_0; |
| return ZX_OK; |
| } |
| } |
| |
| return ZX_ERR_NOT_FOUND; |
| } |
| |
| zx_status_t MapStructs2_1(const smbios::EntryPoint2_1* ep, |
| fbl::RefPtr<VmMapping>* mapping, uintptr_t* struct_table_virt) { |
| paddr_t base = ep->struct_table_phys; |
| paddr_t end = base + ep->struct_table_length; |
| const size_t subpage_offset = base & (PAGE_SIZE - 1); |
| base -= subpage_offset; |
| size_t len = ROUNDUP(end - base, PAGE_SIZE); |
| |
| auto vmar = VmAspace::kernel_aspace()->RootVmar(); |
| fbl::RefPtr<VmObject> vmo; |
| zx_status_t status = VmObjectPhysical::Create(base, len, &vmo); |
| if (status != ZX_OK) { |
| return status; |
| } |
| fbl::RefPtr<VmMapping> m; |
| status = vmar->CreateVmMapping(0, len, 0, 0 /* vmar_flags */, ktl::move(vmo), 0, |
| ARCH_MMU_FLAG_CACHED | ARCH_MMU_FLAG_PERM_READ, |
| "smbios", &m); |
| if (status != ZX_OK) { |
| return status; |
| } |
| *struct_table_virt = m->base() + subpage_offset; |
| *mapping = ktl::move(m); |
| return ZX_OK; |
| } |
| |
| } // namespace |
| |
| // Walk the known SMBIOS structures. The callback will be called once for each |
| // structure found. |
| zx_status_t SmbiosWalkStructs(smbios::StructWalkCallback cb, void* ctx) { |
| switch (kEpVersion) { |
| case smbios::EntryPointVersion::V2_1: { |
| return kEntryPoint.ep2_1->WalkStructs(kStructBase, cb, ctx); |
| } |
| case smbios::EntryPointVersion::V3_0: |
| return ZX_ERR_NOT_SUPPORTED; |
| default: |
| return ZX_ERR_NOT_SUPPORTED; |
| } |
| } |
| |
| void pc_init_smbios() { |
| fbl::RefPtr<VmMapping> mapping; |
| auto cleanup_mapping = fbl::MakeAutoCall([&mapping] { |
| if (mapping) { |
| mapping->Destroy(); |
| } |
| }); |
| |
| const uint8_t* start = nullptr; |
| auto version = smbios::EntryPointVersion::Unknown; |
| uintptr_t struct_table_virt = 0; |
| |
| zx_status_t status = FindEntryPoint(&start, &version); |
| if (status != ZX_OK) { |
| printf("smbios: Failed to locate entry point\n"); |
| return; |
| } |
| |
| switch (version) { |
| case smbios::EntryPointVersion::V2_1: { |
| auto ep = reinterpret_cast<const smbios::EntryPoint2_1*>(start); |
| if (!ep->IsValid()) { |
| return; |
| } |
| |
| status = MapStructs2_1(ep, &mapping, &struct_table_virt); |
| if (status != ZX_OK) { |
| printf("smbios: failed to map structs: %d\n", status); |
| return; |
| } |
| break; |
| } |
| case smbios::EntryPointVersion::V3_0: |
| printf("smbios: version 3 not yet implemented\n"); |
| return; |
| default: |
| DEBUG_ASSERT(false); |
| printf("smbios: Unknown version?\n"); |
| return; |
| } |
| |
| kEntryPoint.raw = start; |
| kEpVersion = version; |
| kStructBase = struct_table_virt; |
| cleanup_mapping.cancel(); |
| } |
| |
| static zx_status_t DebugStructWalk(smbios::SpecVersion ver, |
| const smbios::Header* hdr, const smbios::StringTable& st, |
| void* ctx) { |
| switch (hdr->type) { |
| case smbios::StructType::BiosInfo: { |
| if (ver.IncludesVersion(2, 4)) { |
| auto entry = reinterpret_cast<const smbios::BiosInformationStruct2_4*>(hdr); |
| entry->Dump(st); |
| return ZX_OK; |
| } else if (ver.IncludesVersion(2, 0)) { |
| auto entry = reinterpret_cast<const smbios::BiosInformationStruct2_0*>(hdr); |
| entry->Dump(st); |
| return ZX_OK; |
| } |
| break; |
| } |
| case smbios::StructType::SystemInfo: { |
| if (ver.IncludesVersion(2, 4)) { |
| auto entry = reinterpret_cast<const smbios::SystemInformationStruct2_4*>(hdr); |
| entry->Dump(st); |
| return ZX_OK; |
| } else if (ver.IncludesVersion(2, 1)) { |
| auto entry = reinterpret_cast<const smbios::SystemInformationStruct2_1*>(hdr); |
| entry->Dump(st); |
| return ZX_OK; |
| } else if (ver.IncludesVersion(2, 0)) { |
| auto entry = reinterpret_cast<const smbios::SystemInformationStruct2_0*>(hdr); |
| entry->Dump(st); |
| return ZX_OK; |
| } |
| break; |
| } |
| default: break; |
| } |
| printf("smbios: found struct@%p: typ=%u len=%u st_len=%zu\n", hdr, |
| static_cast<uint8_t>(hdr->type), hdr->length, st.length()); |
| st.Dump(); |
| |
| return ZX_OK; |
| } |
| |
| static int CmdSmbios(int argc, const cmd_args *argv, uint32_t flags) |
| { |
| if (argc < 2) { |
| printf("not enough arguments\n"); |
| usage: |
| printf("usage:\n"); |
| printf("%s dump\n", argv[0].str); |
| return ZX_ERR_INTERNAL; |
| } |
| |
| if (!strcmp(argv[1].str, "dump")) { |
| zx_status_t status = SmbiosWalkStructs(DebugStructWalk, nullptr); |
| if (status != ZX_OK) { |
| printf("smbios: failed to walk structs: %d\n", status); |
| } |
| return ZX_OK; |
| } else { |
| printf("unknown command\n"); |
| goto usage; |
| } |
| |
| return ZX_OK; |
| } |
| |
| STATIC_COMMAND_START |
| #if LK_DEBUGLEVEL > 0 |
| STATIC_COMMAND("smbios", "smbios", &CmdSmbios) |
| #endif |
| STATIC_COMMAND_END(smbios); |