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-rw-r--r--arch/arm/mach-socfpga/headsmp.S33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/mach-socfpga/headsmp.S b/arch/arm/mach-socfpga/headsmp.S
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2003 ARM Limited
+ * Copyright (c) u-boot contributors
+ * Copyright (c) 2012 Pavel Machek <pavel@denx.de>
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/page.h>
+#include <asm/assembler.h>
+
+ .arch armv7-a
+ .arm
+
+ENTRY(secondary_trampoline)
+ /* CPU1 will always fetch from 0x0 when it is brought out of reset.
+ * Thus, we can just subtract the PAGE_OFFSET to get the physical
+ * address of &cpu1start_addr. This would not work for platforms
+ * where the physical memory does not start at 0x0.
+ */
+ARM_BE8(setend be)
+ adr r0, 1f
+ ldmia r0, {r1, r2}
+ sub r2, r2, #PAGE_OFFSET
+ ldr r3, [r2]
+ ldr r4, [r3]
+ARM_BE8(rev r4, r4)
+ bx r4
+
+ .align
+1: .long .
+ .long socfpga_cpu1start_addr
+ENTRY(secondary_trampoline_end)