Move find_acpi_table to new hardware.cpp

src/boot/hardware.cpp

@@ -0,0 +1,41 @@
+#include "hardware.h"
+#include "console.h"
+#include "error.h"
+
+namespace boot {
+namespace hw {
+
+void *
+find_acpi_table(uefi::system_table *st)
+{
+	status_line status(L"Searching for ACPI table");
+
+	// Find ACPI tables. Ignore ACPI 1.0 if a 2.0 table is found.
+	uintptr_t acpi1_table = 0;
+
+	for (size_t i = 0; i < st->number_of_table_entries; ++i) {
+		uefi::configuration_table *table = &st->configuration_table[i];
+
+		// If we find an ACPI 2.0 table, return it immediately
+		if (table->vendor_guid == uefi::vendor_guids::acpi2)
+			return table->vendor_table;
+
+		if (table->vendor_guid == uefi::vendor_guids::acpi1) {
+			// Mark a v1 table with the LSB high
+			acpi1_table = reinterpret_cast<uintptr_t>(table->vendor_table);
+			acpi1_table |= 1;
+		}
+	}
+
+	if (!acpi1_table) {
+		error::raise(uefi::status::not_found, L"Could not find ACPI table");
+	} else if (acpi1_table & 1) {
+		status_line::warn(L"Only found ACPI 1.0 table");
+	}
+
+	return reinterpret_cast<void*>(acpi1_table);
+}
+
+
+} // namespace hw
+} // namespace boot