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

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

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2008 Texas Insturments
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <cpu_func.h>
+#include <irq_func.h>
+#include <asm/system.h>
+#include <asm/secure.h>
+#include <linux/compiler.h>
+
+/*
+ * sdelay() - simple spin loop.
+ *
+ * Will delay execution by roughly (@loops * 2) cycles.
+ * This is necessary to be used before timers are accessible.
+ *
+ * A value of "0" will results in 2^64 loops.
+ */
+void sdelay(unsigned long loops)
+{
+	__asm__ volatile ("1:\n" "subs %0, %0, #1\n"
+			  "b.ne 1b" : "=r" (loops) : "0"(loops) : "cc");
+}
+
+int cleanup_before_linux(void)
+{
+	/*
+	 * this function is called just before we call linux
+	 * it prepares the processor for linux
+	 *
+	 * disable interrupt and turn off caches etc ...
+	 */
+	disable_interrupts();
+
+	/*
+	 * Turn off I-cache and invalidate it
+	 */
+	icache_disable();
+	invalidate_icache_all();
+
+	/*
+	 * turn off D-cache
+	 * dcache_disable() in turn flushes the d-cache and disables MMU
+	 */
+	dcache_disable();
+	invalidate_dcache_all();
+
+	return 0;
+}
+
+#ifdef CONFIG_ARMV8_PSCI
+static void relocate_secure_section(void)
+{
+#ifdef CONFIG_ARMV8_SECURE_BASE
+	size_t sz = __secure_end - __secure_start;
+
+	memcpy((void *)CONFIG_ARMV8_SECURE_BASE, __secure_start, sz);
+	flush_dcache_range(CONFIG_ARMV8_SECURE_BASE,
+			   CONFIG_ARMV8_SECURE_BASE + sz + 1);
+	invalidate_icache_all();
+#endif
+}
+
+void armv8_setup_psci(void)
+{
+	relocate_secure_section();
+	secure_ram_addr(psci_setup_vectors)();
+	secure_ram_addr(psci_arch_init)();
+}
+#endif