GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/arm/cpu/armv8/spin_table.c

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Socionext Inc.
+ *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+ */
+
+#include <common.h>
+#include <linux/libfdt.h>
+#include <asm/spin_table.h>
+
+int spin_table_update_dt(void *fdt)
+{
+	int cpus_offset, offset;
+	const char *prop;
+	int ret;
+	unsigned long rsv_addr = (unsigned long)&spin_table_reserve_begin;
+	unsigned long rsv_size = &spin_table_reserve_end -
+						&spin_table_reserve_begin;
+
+	cpus_offset = fdt_path_offset(fdt, "/cpus");
+	if (cpus_offset < 0)
+		return -ENODEV;
+
+	for (offset = fdt_first_subnode(fdt, cpus_offset);
+	     offset >= 0;
+	     offset = fdt_next_subnode(fdt, offset)) {
+		prop = fdt_getprop(fdt, offset, "device_type", NULL);
+		if (!prop || strcmp(prop, "cpu"))
+			continue;
+
+		/*
+		 * In the first loop, we check if every CPU node specifies
+		 * spin-table.  Otherwise, just return successfully to not
+		 * disturb other methods, like psci.
+		 */
+		prop = fdt_getprop(fdt, offset, "enable-method", NULL);
+		if (!prop || strcmp(prop, "spin-table"))
+			return 0;
+	}
+
+	for (offset = fdt_first_subnode(fdt, cpus_offset);
+	     offset >= 0;
+	     offset = fdt_next_subnode(fdt, offset)) {
+		prop = fdt_getprop(fdt, offset, "device_type", NULL);
+		if (!prop || strcmp(prop, "cpu"))
+			continue;
+
+		ret = fdt_setprop_u64(fdt, offset, "cpu-release-addr",
+				(unsigned long)&spin_table_cpu_release_addr);
+		if (ret)
+			return -ENOSPC;
+	}
+
+	ret = fdt_add_mem_rsv(fdt, rsv_addr, rsv_size);
+	if (ret)
+		return -ENOSPC;
+
+	printf("   Reserved memory region for spin-table: addr=%lx size=%lx\n",
+	       rsv_addr, rsv_size);
+
+	return 0;
+}