From 027016ddae1b3c41c053219a21566ea2c35b8185 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Fri, 12 Apr 2024 16:45:00 +0300
Subject: [PATCH] Kernel: Load all SSDTs and PSDTs

Spec says to load all tables with unique OEM table IDs but that seem
wrong.
---
 kernel/kernel/ACPI/AML.cpp | 37 ++++++-------------------------------
 1 file changed, 6 insertions(+), 31 deletions(-)

diff --git a/kernel/kernel/ACPI/AML.cpp b/kernel/kernel/ACPI/AML.cpp
index 351203e3..9aa1adbd 100644
--- a/kernel/kernel/ACPI/AML.cpp
+++ b/kernel/kernel/ACPI/AML.cpp
@@ -6,46 +6,21 @@
 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)
+	static void load_all(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;
+				continue;
 			}
-
-			MUST(loaded_oem_table_ids.push_back(header->oem_table_id));
 		}
-
-		return true;
 	}
 
 	BAN::RefPtr<AML::Namespace> AML::initialize_namespace()
@@ -66,11 +41,11 @@ namespace Kernel::ACPI
 			return {};
 		}
 
-		if (!load_all_unique(*ns, "SSDT"))
-			return {};
+		// https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#secondary-system-description-table-ssdt
+		load_all(*ns, "SSDT");
 
-		if (!load_all_unique(*ns, "PSDT"))
-			return {};
+		// https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#persistent-system-description-table-psdt
+		load_all(*ns, "PSDT");
 
 #if AML_DEBUG_LEVEL >= 1
 		ns->debug_print(0);