From 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 28 Apr 2024 11:13:47 +0200
Subject: Adding upstream version 2.8.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 bl2/aarch64/bl2_entrypoint.S | 141 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 bl2/aarch64/bl2_entrypoint.S

(limited to 'bl2/aarch64/bl2_entrypoint.S')

diff --git a/bl2/aarch64/bl2_entrypoint.S b/bl2/aarch64/bl2_entrypoint.S
new file mode 100644
index 0000000..a021e42
--- /dev/null
+++ b/bl2/aarch64/bl2_entrypoint.S
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <common/bl_common.h>
+
+
+	.globl	bl2_entrypoint
+
+
+
+func bl2_entrypoint
+	/*---------------------------------------------
+	 * Save arguments x0 - x3 from BL1 for future
+	 * use.
+	 * ---------------------------------------------
+	 */
+	mov	x20, x0
+	mov	x21, x1
+	mov	x22, x2
+	mov	x23, x3
+
+	/* ---------------------------------------------
+	 * Set the exception vector to something sane.
+	 * ---------------------------------------------
+	 */
+	adr	x0, early_exceptions
+	msr	vbar_el1, x0
+	isb
+
+	/* ---------------------------------------------
+	 * Enable the SError interrupt now that the
+	 * exception vectors have been setup.
+	 * ---------------------------------------------
+	 */
+	msr	daifclr, #DAIF_ABT_BIT
+
+	/* ---------------------------------------------
+	 * Enable the instruction cache, stack pointer
+	 * and data access alignment checks and disable
+	 * speculative loads.
+	 * ---------------------------------------------
+	 */
+	mov	x1, #(SCTLR_I_BIT | SCTLR_A_BIT | SCTLR_SA_BIT)
+	mrs	x0, sctlr_el1
+	orr	x0, x0, x1
+	bic	x0, x0, #SCTLR_DSSBS_BIT
+	msr	sctlr_el1, x0
+	isb
+
+	/* ---------------------------------------------
+	 * Invalidate the RW memory used by the BL2
+	 * image. This includes the data and NOBITS
+	 * sections. This is done to safeguard against
+	 * possible corruption of this memory by dirty
+	 * cache lines in a system cache as a result of
+	 * use by an earlier boot loader stage.
+	 * ---------------------------------------------
+	 */
+	adr	x0, __RW_START__
+	adr	x1, __RW_END__
+	sub	x1, x1, x0
+	bl	inv_dcache_range
+
+	/* ---------------------------------------------
+	 * Zero out NOBITS sections. There are 2 of them:
+	 *   - the .bss section;
+	 *   - the coherent memory section.
+	 * ---------------------------------------------
+	 */
+	adrp	x0, __BSS_START__
+	add	x0, x0, :lo12:__BSS_START__
+	adrp	x1, __BSS_END__
+	add	x1, x1, :lo12:__BSS_END__
+	sub	x1, x1, x0
+	bl	zeromem
+
+#if USE_COHERENT_MEM
+	adrp	x0, __COHERENT_RAM_START__
+	add	x0, x0, :lo12:__COHERENT_RAM_START__
+	adrp	x1, __COHERENT_RAM_END_UNALIGNED__
+	add	x1, x1, :lo12:__COHERENT_RAM_END_UNALIGNED__
+	sub	x1, x1, x0
+	bl	zeromem
+#endif
+
+	/* --------------------------------------------
+	 * Allocate a stack whose memory will be marked
+	 * as Normal-IS-WBWA when the MMU is enabled.
+	 * There is no risk of reading stale stack
+	 * memory after enabling the MMU as only the
+	 * primary cpu is running at the moment.
+	 * --------------------------------------------
+	 */
+	bl	plat_set_my_stack
+
+	/* ---------------------------------------------
+	 * Initialize the stack protector canary before
+	 * any C code is called.
+	 * ---------------------------------------------
+	 */
+#if STACK_PROTECTOR_ENABLED
+	bl	update_stack_protector_canary
+#endif
+
+	/* ---------------------------------------------
+	 * Perform BL2 setup
+	 * ---------------------------------------------
+	 */
+	mov	x0, x20
+	mov	x1, x21
+	mov	x2, x22
+	mov	x3, x23
+	bl	bl2_setup
+
+#if ENABLE_PAUTH
+	/* ---------------------------------------------
+	 * Program APIAKey_EL1
+	 * and enable pointer authentication.
+	 * ---------------------------------------------
+	 */
+	bl	pauth_init_enable_el1
+#endif /* ENABLE_PAUTH */
+
+	/* ---------------------------------------------
+	 * Jump to main function.
+	 * ---------------------------------------------
+	 */
+	bl	bl2_main
+
+	/* ---------------------------------------------
+	 * Should never reach this point.
+	 * ---------------------------------------------
+	 */
+	no_ret	plat_panic_handler
+
+endfunc bl2_entrypoint
-- 
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