108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arch_helpers.h>
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#include <platform.h>
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#include <assert.h>
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/*******************************************************************************
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* This duplicates what the primary cpu did after a cold boot in BL1. The same
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* needs to be done when a cpu is hotplugged in. This function could also over-
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* ride any EL3 setup done by BL1 as this code resides in rw memory.
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******************************************************************************/
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void bl31_arch_setup(void)
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{
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unsigned long tmp_reg = 0;
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unsigned int counter_base_frequency;
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/* Enable alignment checks and set the exception endianness to LE */
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tmp_reg = read_sctlr();
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tmp_reg |= (SCTLR_A_BIT | SCTLR_SA_BIT);
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tmp_reg &= ~SCTLR_EE_BIT;
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write_sctlr(tmp_reg);
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/*
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* Enable HVCs, route FIQs to EL3, set the next EL to be AArch64, route
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* external abort and SError interrupts to EL3
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*/
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tmp_reg = SCR_RES1_BITS | SCR_RW_BIT | SCR_HCE_BIT | SCR_EA_BIT |
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SCR_FIQ_BIT;
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write_scr(tmp_reg);
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/*
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* Enable SError and Debug exceptions
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*/
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enable_serror();
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enable_debug_exceptions();
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/* Do not trap coprocessor accesses from lower ELs to EL3 */
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write_cptr_el3(0);
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/* Read the frequency from Frequency modes table */
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counter_base_frequency = mmio_read_32(SYS_CNTCTL_BASE + CNTFID_OFF);
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/* The first entry of the frequency modes table must not be 0 */
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assert(counter_base_frequency != 0);
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/* Program the counter frequency */
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write_cntfrq_el0(counter_base_frequency);
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return;
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}
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/*******************************************************************************
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* Detect what is the next Non-Secure EL and setup the required architectural
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* state
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******************************************************************************/
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void bl31_arch_next_el_setup(void) {
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unsigned long id_aa64pfr0 = read_id_aa64pfr0_el1();
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unsigned long current_sctlr, next_sctlr;
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unsigned long el_status;
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unsigned long scr = read_scr();
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/* Use the same endianness than the current BL */
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current_sctlr = read_sctlr();
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next_sctlr = (current_sctlr & SCTLR_EE_BIT);
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/* Find out which EL we are going to */
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el_status = (id_aa64pfr0 >> ID_AA64PFR0_EL2_SHIFT) & ID_AA64PFR0_ELX_MASK;
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/* Check what if EL2 is supported */
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if (el_status && (scr & SCR_HCE_BIT)) {
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/* Set SCTLR EL2 */
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next_sctlr |= SCTLR_EL2_RES1;
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write_sctlr_el2(next_sctlr);
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} else {
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/* Set SCTLR Non-Secure EL1 */
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next_sctlr |= SCTLR_EL1_RES1;
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write_sctlr_el1(next_sctlr);
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}
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}
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