Kernel: Only compile lai for x86_64 targets

I will be dropping lai entirely soon. Once I get to writing AML
interpreter.

kernel/CMakeLists.txt

@@ -113,6 +113,13 @@ if("${BANAN_ARCH}" STREQUAL "x86_64")
 		arch/x86_64/Syscall.S
 		arch/x86_64/Thread.S
 	)
+	file(GLOB_RECURSE LAI_SOURCES
+		lai/*.c
+	)
+	set(LAI_SOURCES
+		${LAI_SOURCES}
+		kernel/lai_host.cpp
+	)
 elseif("${BANAN_ARCH}" STREQUAL "i386")
 	set(KERNEL_SOURCES
 		${KERNEL_SOURCES}
@@ -125,14 +132,6 @@ else()
 	message(FATAL_ERROR "unsupported architecure ${BANAN_ARCH}")
 endif()
 
-file(GLOB_RECURSE LAI_SOURCES
-	lai/*.c
-)
-set(LAI_SOURCES
-	${LAI_SOURCES}
-	kernel/lai_host.cpp
-)
-
 set(BAN_SOURCES
 	../BAN/BAN/Assert.cpp
 	../BAN/BAN/New.cpp
@@ -177,7 +176,7 @@ if(ENABLE_KERNEL_UBSAN)
 endif()
 
 if("${BANAN_ARCH}" STREQUAL "x86_64")
-	target_compile_options(kernel PUBLIC -mcmodel=kernel -mno-red-zone -mno-mmx)
+	target_compile_options(kernel PUBLIC -mcmodel=kernel -mno-red-zone)
 	target_link_options(kernel PUBLIC LINKER:-z,max-page-size=4096)
 	target_link_options(kernel PUBLIC LINKER:-T,${CMAKE_CURRENT_SOURCE_DIR}/arch/x86_64/linker.ld)
 elseif("${BANAN_ARCH}" STREQUAL "i386")

kernel/kernel/ACPI.cpp

@@ -31,7 +31,9 @@ namespace Kernel
 		if (s_instance == nullptr)
 			return BAN::Error::from_errno(ENOMEM);
 		TRY(s_instance->initialize_impl());
+#if ARCH(x86_64)
 		lai_create_namespace();
+#endif
 		return {};
 	}
 
@@ -93,7 +95,9 @@ namespace Kernel
 		const RSDP* rsdp = locate_rsdp();
 		if (rsdp == nullptr)
 			return BAN::Error::from_error_code(ErrorCode::ACPI_NoRootSDT);
+#if ARCH(x86_64)
 		lai_set_acpi_revision(rsdp->revision);
+#endif
 
 		uint32_t root_entry_count = 0;
 

kernel/kernel/InterruptController.cpp

@@ -42,7 +42,9 @@ namespace Kernel
 
 	void InterruptController::enter_acpi_mode()
 	{
+#if ARCH(x86_64)
 		if (lai_enable_acpi(m_using_apic ? 1 : 0) != 0)
+#endif
 			dwarnln("could not enter acpi mode");
 	}
 

kernel/kernel/Process.cpp

@@ -1187,7 +1187,9 @@ namespace Kernel
 
 	[[noreturn]] static void reset_system()
 	{
+#if ARCH(x86_64)
 		lai_acpi_reset();
+#endif
 
 		// acpi reset did not work
 
@@ -1206,21 +1208,17 @@ namespace Kernel
 
 		DevFileSystem::get().initiate_sync(true);
 
-		lai_api_error_t error;
-		switch (command)
-		{
-			case POWEROFF_REBOOT:
-				reset_system();
-				break;
-			case POWEROFF_SHUTDOWN:
-				error = lai_enter_sleep(5);
-				break;
-			default:
-				ASSERT_NOT_REACHED();
-		}
+		if (command == POWEROFF_REBOOT)
+			reset_system();
 
+#if ARCH(x86_64)
+		auto error = lai_enter_sleep(5);
 		// If we reach here, there was an error
 		dprintln("{}", lai_api_error_to_string(error));
+#else
+		dprintln("poweroff available only on x86_64");
+#endif
+
 		return BAN::Error::from_errno(EUNKNOWN);
 	}