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

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2013
+ * David Feng <fenghua@phytium.com.cn>
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <linux/linkage.h>
+#include <asm/macro.h>
+
+.pushsection .text.armv8_switch_to_el2, "ax"
+ENTRY(armv8_switch_to_el2)
+	switch_el x6, 1f, 0f, 0f
+0:
+	cmp x5, #ES_TO_AARCH64
+	b.eq 2f
+	/*
+	 * When loading 32-bit kernel, it will jump
+	 * to secure firmware again, and never return.
+	 */
+	bl armv8_el2_to_aarch32
+2:
+	/*
+	 * x4 is kernel entry point or switch_to_el1
+	 * if CONFIG_ARMV8_SWITCH_TO_EL1 is defined.
+         * When running in EL2 now, jump to the
+	 * address saved in x4.
+	 */
+	br x4
+1:	armv8_switch_to_el2_m x4, x5, x6
+ENDPROC(armv8_switch_to_el2)
+.popsection
+
+.pushsection .text.armv8_switch_to_el1, "ax"
+ENTRY(armv8_switch_to_el1)
+	switch_el x6, 0f, 1f, 0f
+0:
+	/* x4 is kernel entry point. When running in EL1
+	 * now, jump to the address saved in x4.
+	 */
+	br x4
+1:	armv8_switch_to_el1_m x4, x5, x6
+ENDPROC(armv8_switch_to_el1)
+.popsection
+
+.pushsection .text.armv8_el2_to_aarch32, "ax"
+WEAK(armv8_el2_to_aarch32)
+	ret
+ENDPROC(armv8_el2_to_aarch32)
+.popsection