platform_mp_stack.S

/*
 * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch.h>
#include <asm_macros.S>
#include <assert_macros.S>
#include <platform_def.h>

	.local	platform_normal_stacks
#if ENABLE_PLAT_COMPAT
	.globl	plat_get_my_stack
	.globl	plat_set_my_stack
	.weak	platform_get_stack
	.weak	platform_set_stack
#else
	.weak	plat_get_my_stack
	.weak	plat_set_my_stack
	.globl	platform_get_stack
	.globl	platform_set_stack
#endif /* __ENABLE_PLAT_COMPAT__ */

#if ENABLE_PLAT_COMPAT
	/* ---------------------------------------------------------------------
	 * When the compatility layer is enabled, the new platform APIs
	 * viz plat_get_my_stack() and plat_set_my_stack() need to be
	 * defined using the previous APIs platform_get_stack() and
	 * platform_set_stack(). Also we need to provide weak definitions
	 * of platform_get_stack() and platform_set_stack() for the platforms
	 * to reuse.
	 * --------------------------------------------------------------------
	 */

	/* -----------------------------------------------------
	 * unsigned long plat_get_my_stack ()
	 *
	 * For the current CPU, this function returns the stack
	 * pointer for a stack allocated in device memory.
	 * -----------------------------------------------------
	 */
func plat_get_my_stack
	mrs	x0, mpidr_el1
	b	platform_get_stack
endfunc plat_get_my_stack

	/* -----------------------------------------------------
	 * void plat_set_my_stack ()
	 *
	 * For the current CPU, this function sets the stack
	 * pointer to a stack allocated in normal memory.
	 * -----------------------------------------------------
	 */
func plat_set_my_stack
	mrs	x0, mpidr_el1
	b	platform_set_stack
endfunc plat_set_my_stack

	/* -----------------------------------------------------
	 * 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
endfunc platform_get_stack

	/* -----------------------------------------------------
	 * 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
endfunc platform_set_stack

#else
	/* ---------------------------------------------------------------------
	 * When the compatility layer is disabled, the new platform APIs
	 * viz plat_get_my_stack() and plat_set_my_stack() are
	 * supported by the platform and the previous APIs platform_get_stack()
	 * and platform_set_stack() are defined in terms of new APIs making use
	 * of the fact that they are only ever invoked for the current CPU.
	 * This is to enable components of Trusted Firmware like SPDs using the
	 * old platform APIs to continue to work.
	 * --------------------------------------------------------------------
	 */

	/* -------------------------------------------------------
	 * unsigned long platform_get_stack (unsigned long mpidr)
	 *
	 * For the current CPU, this function returns the stack
	 * pointer for a stack allocated in device memory. The
	 * 'mpidr' should correspond to that of the current CPU.
	 * This function is deprecated and plat_get_my_stack()
	 * should be used instead.
	 * -------------------------------------------------------
	 */
func_deprecated platform_get_stack
#if ENABLE_ASSERTIONS
	mrs	x1, mpidr_el1
	cmp	x0, x1
	ASM_ASSERT(eq)
#endif
	b	plat_get_my_stack
endfunc_deprecated platform_get_stack

	/* -----------------------------------------------------
	 * void platform_set_stack (unsigned long mpidr)
	 *
	 * For the current CPU, this function sets the stack pointer
	 * to a stack allocated in normal memory. The
	 * 'mpidr' should correspond to that of the current CPU.
	 * This function is deprecated and plat_get_my_stack()
	 * should be used instead.
	 * -----------------------------------------------------
	 */
func_deprecated platform_set_stack
#if ENABLE_ASSERTIONS
	mrs	x1, mpidr_el1
	cmp	x0, x1
	ASM_ASSERT(eq)
#endif
	b	plat_set_my_stack
endfunc_deprecated platform_set_stack

	/* -----------------------------------------------------
	 * uintptr_t plat_get_my_stack ()
	 *
	 * For the current CPU, this function returns the stack
	 * pointer for a stack allocated in device memory.
	 * -----------------------------------------------------
	 */
func plat_get_my_stack
	mov	x10, x30 // lr
	get_my_mp_stack platform_normal_stacks, PLATFORM_STACK_SIZE
	ret	x10
endfunc plat_get_my_stack

	/* -----------------------------------------------------
	 * void plat_set_my_stack ()
	 *
	 * For the current CPU, this function sets the stack
	 * pointer to a stack allocated in normal memory.
	 * -----------------------------------------------------
	 */
func plat_set_my_stack
	mov	x9, x30 // lr
	bl 	plat_get_my_stack
	mov	sp, x0
	ret	x9
endfunc plat_set_my_stack

#endif /*__ENABLE_PLAT_COMPAT__*/

	/* -----------------------------------------------------
	 * Per-cpu stacks in normal memory. Each cpu gets a
	 * stack of PLATFORM_STACK_SIZE bytes.
	 * -----------------------------------------------------
	 */
declare_stack platform_normal_stacks, tzfw_normal_stacks, \
		PLATFORM_STACK_SIZE, PLATFORM_CORE_COUNT, \
		CACHE_WRITEBACK_GRANULE