arm64: Drop dead file stage_entry.S

This file has been dead since commit 7dcf9d51 (arm64: tegra132:
tegra210: Remove old arm64/stage_entry.S), I just forgot to remove it.

Change-Id: I0dd6666371036ecd42c1b256dbbe22a01ae959b8
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/27236
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/arch/arm64/stage_entry.S b/src/arch/arm64/stage_entry.S
deleted file mode 100644
index 7aeabe6..0000000
--- a/src/arch/arm64/stage_entry.S
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright 2014 Google Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-/*
- * ======================== stage_entry.S =====================================
- * This file acts as an entry point to the different stages of arm64. They share
- * the same process of setting up stacks and jumping to c code. It is important
- * to save x25 from corruption as it contains the argument for rmodule.
- * =============================================================================
- */
-
-#include <arch/asm.h>
-#define __ASSEMBLY__
-#include <arch/lib_helpers.h>
-
-#define STACK_SZ CONFIG_STACK_SIZE
-#define EXCEPTION_STACK_SZ CONFIG_STACK_SIZE
-
-/*
- * Stack for armv8 CPU grows down from _estack. Additionally, provide exception
- * stack for the CPU.
- */
-.section .bss, "aw", @nobits
-
-.global _stack
-.global _estack
-.balign STACK_SZ
-_stack:
-.space STACK_SZ
-_estack:
-
-.global _stack_exceptions
-.global _estack_exceptions
-.balign EXCEPTION_STACK_SZ
-_stack_exceptions:
-.space EXCEPTION_STACK_SZ
-_estack_exceptions:
-
-ENTRY(cpu_get_stack)
-	ldr	x0, 1f
-	ret
-.align 3
-1:
-	.quad	_estack
-ENDPROC(cpu_get_stack)
-
-ENTRY(cpu_get_exception_stack)
-	ldr	x0, 1f
-	ret
-.align 3
-1:
-	.quad	_estack_exceptions
-ENDPROC(cpu_get_exception_stack)
-
-/*
- * Boot strap the processor into a C environemnt. That consists of providing
- * 16-byte aligned stack. The programming enviroment uses SP_EL0 as its main
- * stack while keeping SP_ELx reserved for exception entry.
- */
-/*
- * IMPORTANT: Ensure x25 is not corrupted because it saves the argument to
- * any rmodules.
- */
-ENTRY(arm64_c_environment)
-	/* Set the exception stack for the CPU. */
-	bl	cpu_get_exception_stack
-	msr	SPSel, #1
-	isb
-	mov	sp, x0
-
-	/* Have stack pointer use SP_EL0. */
-	msr	SPSel, #0
-	isb
-
-	/* Set the non-exception stack for the CPU. */
-	bl	cpu_get_stack
-	mov	sp, x0
-
-	/* Get entry point by dereferencing c_entry. */
-	ldr	x1, 1f
-	/* Move back the arguments from x25 to x0 */
-	mov     x0, x25
-	br	x1
-.align 3
-	1:
-	.quad	c_entry
-ENDPROC(arm64_c_environment)
-
-ENTRY(_start)
-	/* Save any arguments to current rmodule in x25 */
-	mov	x25, x0
-	b	arm64_c_environment
-ENDPROC(_start)
-
-/*
- * Setup SCTLR so that:
- * Little endian mode is setup, XN is not enforced, MMU and caches are disabled.
- * Alignment and stack alignment checks are disabled.
- */
-.macro setup_sctlr
-	read_current x0, sctlr
-	bic	x0, x0, #(1 << 25)	/* Little Endian */
-	bic	x0, x0, #(1 << 19)	/* XN not enforced */
-	bic	x0, x0, #(1 << 12)	/* Disable Instruction Cache */
-	bic	x0, x0, #0xf		/* Clear SA, C, A and M */
-	write_current sctlr, x0, x1
-.endm
-
-CPU_RESET_ENTRY(arm64_cpu_startup)
-	bl arm64_cpu_early_setup
-	setup_sctlr
-	b	arm64_c_environment
-ENDPROC(arm64_cpu_startup)
-
-/*
- * stage_entry is defined as a weak symbol to allow SoCs/CPUs to define a custom
- * entry point to perform any fixups that need to be done immediately after
- * power on reset. In case SoC/CPU does not need any custom-defined entrypoint,
- * this weak symbol can be used to jump directly to arm64_cpu_startup.
- */
-ENTRY_WEAK(stage_entry)
-	b	arm64_cpu_startup
-ENDPROC(stage_entry)