LoongArch: Add FDT booting support from efi system table

Since commit 40cd01a9c324("efi/loongarch: libstub: remove dependency on
flattened DT"), we can parse the FDT from efi system table.

And now, LoongArch is coming to support booting with FDT, so we add the
relevant booting support as well as parameter parsing.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

1 files changed, 16 insertions, 1 deletions

diff --git a/arch/loongarch/kernel/numa.c b/arch/loongarch/kernel/numa.c
index a13f92593cfd..3019ca14c760 100644
--- a/arch/loongarch/kernel/numa.c
+++ b/arch/loongarch/kernel/numa.c
@@ -388,6 +388,21 @@ static void __init numa_default_distance(void)
 	}
 }
 
+/*
+ * fake_numa_init() - For Non-ACPI systems
+ * Return: 0 on success, -errno on failure.
+ */
+static int __init fake_numa_init(void)
+{
+	phys_addr_t start = memblock_start_of_DRAM();
+	phys_addr_t end = memblock_end_of_DRAM() - 1;
+
+	node_set(0, numa_nodes_parsed);
+	pr_info("Faking a node at [mem %pap-%pap]\n", &start, &end);
+
+	return numa_add_memblk(0, start, end + 1);
+}
+
 int __init init_numa_memory(void)
 {
 	int i;
@@ -404,7 +419,7 @@ int __init init_numa_memory(void)
 	memset(&numa_meminfo, 0, sizeof(numa_meminfo));
 
 	/* Parse SRAT and SLIT if provided by firmware. */
-	ret = acpi_numa_init();
+	ret = acpi_disabled ? fake_numa_init() : acpi_numa_init();
 	if (ret < 0)
 		return ret;