Home | History | Annotate | Download | only in aarch64
      1 /*
      2  * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are met:
      6  *
      7  * Redistributions of source code must retain the above copyright notice, this
      8  * list of conditions and the following disclaimer.
      9  *
     10  * Redistributions in binary form must reproduce the above copyright notice,
     11  * this list of conditions and the following disclaimer in the documentation
     12  * and/or other materials provided with the distribution.
     13  *
     14  * Neither the name of ARM nor the names of its contributors may be used
     15  * to endorse or promote products derived from this software without specific
     16  * prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
     22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <arch.h>
     32 #include <arch_helpers.h>
     33 
     34 /*******************************************************************************
     35  * Function that does the first bit of architectural setup that affects
     36  * execution in the non-secure address space.
     37  ******************************************************************************/
     38 void bl1_arch_setup(void)
     39 {
     40 	/* Set the next EL to be AArch64 */
     41 	write_scr_el3(SCR_RES1_BITS | SCR_RW_BIT);
     42 }
     43 
     44 /*******************************************************************************
     45  * Set the Secure EL1 required architectural state
     46  ******************************************************************************/
     47 void bl1_arch_next_el_setup(void)
     48 {
     49 	unsigned long next_sctlr;
     50 
     51 	/* Use the same endianness than the current BL */
     52 	next_sctlr = (read_sctlr_el3() & SCTLR_EE_BIT);
     53 
     54 	/* Set SCTLR Secure EL1 */
     55 	next_sctlr |= SCTLR_EL1_RES1;
     56 
     57 	write_sctlr_el1(next_sctlr);
     58 }
     59