plat/common/aarch64/platform_mp_stack.S

/*
 * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <arch.h>
#include <asm_macros.S>
#include <platform.h>


	.local	pcpu_dv_mem_stack
	.local	platform_normal_stacks
	.weak	platform_set_stack
	.weak	platform_get_stack
	.weak	platform_set_coherent_stack


	/* -----------------------------------------------------
	 * void platform_set_coherent_stack (unsigned long mpidr)
	 *
	 * For a given CPU, this function sets the stack pointer
	 * to a stack allocated in device memory. This stack can
	 * be used by C code which enables/disables the SCTLR.M
	 * SCTLR.C bit e.g. while powering down a cpu
	 * -----------------------------------------------------
	 */
func platform_set_coherent_stack
	mov x5, x30 // lr
	get_mp_stack pcpu_dv_mem_stack, PCPU_DV_MEM_STACK_SIZE
	mov sp, x0
	ret x5

	/* -----------------------------------------------------
	 * unsigned long platform_get_stack (unsigned long mpidr)
	 *
	 * For a given CPU, this function returns the stack
	 * pointer for a stack allocated in device memory.
	 * -----------------------------------------------------
	 */
func platform_get_stack
	mov x10, x30 // lr
	get_mp_stack platform_normal_stacks, PLATFORM_STACK_SIZE
	ret x10

	/* -----------------------------------------------------
	 * void platform_set_stack (unsigned long mpidr)
	 *
	 * For a given CPU, this function sets the stack pointer
	 * to a stack allocated in normal memory.
	 * -----------------------------------------------------
	 */
func platform_set_stack
	mov x9, x30 // lr
	bl  platform_get_stack
	mov sp, x0
	ret x9

	/* -----------------------------------------------------
	 * Per-cpu stacks in normal memory.
	 * Used for C code during runtime execution (when coherent
	 * stacks are not required).
	 * Each cpu gets a stack of PLATFORM_STACK_SIZE bytes.
	 * -----------------------------------------------------
	 */
declare_stack platform_normal_stacks, tzfw_normal_stacks, \
		PLATFORM_STACK_SIZE, PLATFORM_CORE_COUNT

	/* -----------------------------------------------------
	 * Per-cpu stacks in device memory.
	 * Used for C code just before power down or right after
	 * power up when the MMU or caches need to be turned on
	 * or off.
	 * Each cpu gets a stack of PCPU_DV_MEM_STACK_SIZE bytes.
	 * -----------------------------------------------------
	 */
declare_stack pcpu_dv_mem_stack, tzfw_coherent_mem, \
		PCPU_DV_MEM_STACK_SIZE, PLATFORM_CORE_COUNT