src/arch/arm/boot_asm64.S

/*
 * Copyright 2014 Google Inc.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#define __ASSEMBLY__
#include <arch/lib_helpers.h>

	.global boot_arm_linux_jump
	.type boot_arm_linux_jump, function
boot_arm_linux_jump:
	/* Entered with X0 = &fdt, X1 = entry */

	mov	x27, x1		/* Kernel entry */

	/* Configure sctlr to have caches off, etc. */
	read_current x2, sctlr
	ldr	 x3, .SCTLR_MASK
	and	 x2, x2, x3
	write_current sctlr, x2, x3

	isb

	msr      DAIFSet, #0xf

				/* X0 = &fdt (already set by function caller) */
	mov	x1, #0		/* X1 = 0 */
	mov	x2, #0		/* X2 = 0 */
	mov	x3, #0		/* X3 = 0 */

	br	x27		/* jump to entry pointer */
.align 4
	 .SCTLR_MASK:
	/*
	 * Little endian, XN not enforced, Instruction caches disabled,
	 * no stack alignment checking, data and unified cache disabled,
	 * alignment checking disabled, and MMU disabled.
	 */
	 .quad 0x0fdf7eff0