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Kernel: Fix ACPI namespace initialization 

ACPI spec says that only SSDTS with unique OEM table IDs are to be
loaded.

Add loading of ACPI 1.0 PSDTs
This commit is contained in:
Bananymous 2024-04-12 12:39:46 +03:00
parent 89c4abc07a
commit 17871bb3ca
2 changed files with 49 additions and 14 deletions
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59
kernel/kernel/ACPI/AML.cpp
View File

@ -6,34 +6,71 @@
namespace Kernel::ACPI
{
// https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#secondary-system-description-table-ssdt
// https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#persistent-system-description-table-psdt
static bool load_all_unique(AML::Namespace& ns, BAN::StringView signature)
{
// Only SSDT and PSDT that have unique OEM Table ID are loaded in order they appear in the RSDT/XSDT
BAN::Vector<uint64_t> loaded_oem_table_ids;
for (uint32_t i = 0;; i++)
{
auto* header = ACPI::ACPI::get().get_header(signature, i);
if (!header)
break;
bool need_to_parse = true;
for (uint64_t id : loaded_oem_table_ids)
{
if (id == header->oem_table_id)
{
need_to_parse = false;
break;
}
}
if (!need_to_parse)
{
dprintln("Skipping {}{} ({} bytes)", signature, i, header->length);
continue;
}
dprintln("Parsing {}{} ({} bytes)", signature, i, header->length);
if (!ns.parse(*header))
{
dwarnln("Failed to parse {}", signature);
return false;
}
MUST(loaded_oem_table_ids.push_back(header->oem_table_id));
}
return true;
}
BAN::RefPtr<AML::Namespace> AML::initialize_namespace()
{
auto ns = AML::Namespace::create_root_namespace();
// Parse DSDT
// https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#differentiated-system-description-table-dsdt
auto* dsdt = ACPI::ACPI::get().get_header("DSDT", 0);
if (!dsdt)
{
dwarnln("Failed to get DSDT");
return {};
}
dprintln("Parsing DSDT ({} bytes)", dsdt->length);
if (!ns->parse(*dsdt))
{
dwarnln("Failed to parse DSDT");
return {};
}
for (uint32_t i = 0;; i++)
{
auto* ssdt = ACPI::ACPI::get().get_header("SSDT", i);
if (!ssdt)
break;
if (!ns->parse(*ssdt))
{
dwarnln("Failed to parse SSDT");
if (!load_all_unique(*ns, "SSDT"))
return {};
if (!load_all_unique(*ns, "PSDT"))
return {};
}
}
#if AML_DEBUG_LEVEL >= 1
ns->debug_print(0);

2
kernel/kernel/ACPI/AML/Namespace.cpp
View File

@ -225,8 +225,6 @@ namespace Kernel::ACPI
{
ASSERT(this == s_root_namespace.ptr());
dprintln("Parsing {}, {} bytes of AML", header, header.length);
AML::ParseContext context;
context.scope = AML::NameString("\\"sv);
context.aml_data = BAN::ConstByteSpan(reinterpret_cast<const uint8_t*>(&header), header.length).slice(sizeof(header));